Air Chamber With Inlet Control Surrounds Disperser At Wall Patents (Class 431/188)
  • Patent number: 10612773
    Abstract: A burner operating with flameless combustion, comprising a system for sucking the recycling flue gases directly from the combustion chamber by means of an ejector fed with the comburent, a heat exchange system positioned between the recycling flue gases and the comburent, a system for injecting the fuel directly into the recycling flue gases, the latter comprising or not comprising the comburent with formation of a mixture of fuel-recycling flue gases-comburent in the zone around the outlet of the comburent ejector and following introduction of the mixture into the combustion chamber.
    Type: Grant
    Filed: March 20, 2015
    Date of Patent: April 7, 2020
    Assignee: SOFINTER S.P.A.
    Inventor: Lorenzo Morandi
  • Patent number: 10551057
    Abstract: A gas burner with multiple rings of flames, suitable for mounting on a top plate of a cooking appliance in particular for household use. The top plate extends substantially in a plate plane. The gas burner includes a central burner having a ring of peripheral flames and at least one annular burner having at least one ring of peripheral flames. The annular burner surrounds the central burner. The gas burner also includes a burner body suitable for attachment to the top plate. The burner body includes at least a first gas inlet communicating with a first gas injector situated facing a first convergent-divergent pipe forming a Venturi tube. The first pipe has an axis substantially parallel to said plate plane. The first pipe extends over at least the greater portion of a transverse extension of the burner body. The first pipe is, at its end opposite to the first gas injector, in communication with a shaft substantially perpendicular to the axis of the first pipe.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: February 4, 2020
    Assignee: SOCIETE NOUVELLE SOURDILLON
    Inventors: Christophe Trochou, Fabienne Mereau, Gilles Mongay
  • Patent number: 9791147
    Abstract: The present document describes a multistages combustion furnace system for thermal expansion of mineral particles which comprises: a furnace having an expansion chamber for receiving the mineral particles; a burner head to be connected at a distance for an atmospheric coupling of the furnace and for operating the multistages combustion furnace system; a furnace device to be connected at a distance for an atmospheric coupling of the burner head to offset the quenching effect of ambient air normally drawn in the furnace; and a tuyere for thermal expansion of mineral particles to be connected between the expansion chamber and the furnace device; wherein the multistage combustion furnace system is to be connected with an inlet of preheated air.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: October 17, 2017
    Assignee: TERAJOULE INC.
    Inventor: Michael Spino
  • Patent number: 9222668
    Abstract: A burner apparatus for a furnace system and a method of burner operation. The burner has a series of fuel ejection structures which at least partially surround the burner wall for ejecting fuel into a combustion region projecting from the forward end of the burner wall. The ejection structures preferably eject fuel outside of the burner wall at alternating angles. Further, the burner apparatus preferably includes at least one additional series of fuel ejection structures which is spaced radially outward from the first series of ejection structures.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: December 29, 2015
    Assignee: ZEECO, INC.
    Inventors: Darton J. Zink, Rex K. Isaacs, John Philip Guarco, Frank E. Beale, John McDonald, Cody L. Little, Seth Marty, Ryan Roberts
  • Patent number: 9221293
    Abstract: Method of designing a security thread in security documents with better color contrast at any viewing angle is claimed. The invention discloses designing of security thread in security documents like bank notes using subwavelength gratings with period and thickness less than the wavelength of light. The sub wavelength gratings preferably asymmetric are designed such that the Oth order reflections are of longer wavelength (red) and the higher order reflections (diffracted orders) are of shorter wavelengths (blue/green). The security thread so designed gives better color contrast unlike the rainbow colors of prior art thus allowing better and easier distinction of authentic documents.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: December 29, 2015
    Assignee: Council of Scientific & Industrial Research
    Inventors: Bala Pesala, Mridula Madhusudan
  • Patent number: 8920159
    Abstract: An apparatus is provided for combining oxygen and fuel to produce a mixture to be burned in a burner. The oxygen-fuel mixture is ignited in a fuel-ignition zone in a flame chamber to produce a flame.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: December 30, 2014
    Assignee: Honeywell International Inc.
    Inventor: Curtis Taylor
  • Patent number: 8714969
    Abstract: The invention relates to a fuel combustion method in which one jet of fuel and at least two jets of oxidant are injected. According to the invention, the first jet of oxidant, known as the primary oxidant jet, is injected such as to be in contact with the jet of fuel and to produce a first incomplete combustion, the gases produced by said first combustion comprising at least one part of the fuel, and the second jet of oxidant is injected at a distance from the jet of fuel such as to combust with the part of the fuel present in the gases produced by the first combustion. Moreover, the primary oxidant jet is divided into two primary jets, namely: a first primary oxidant jet, known as the central jet, which is injected at the centre of the jet of fuel; and a second primary oxidant jet, knows as the sheathing jet, which is injected coaxially around the fuel jet.
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: May 6, 2014
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Bertrand Leroux, Remi Pierre Tsiava
  • Patent number: 8689707
    Abstract: A replacement burner system which facilitates reduction of nitrous oxide produced during combustion of a fuel. The replacement burner system comprising a fuel supply duct having an inlet and an outlet with a fuel deflector located within the fuel supply duct to facilitate redistribution of a flow of the fuel. An adjustable coal nozzle is located within the fuel supply duct between the fuel deflector and the outlet. An exterior surface of the fuel supply duct supports an air swirling device, and the air swirling device obstructs between 65% and 75% of the transverse flow area, located between an exterior surface of the fuel supply duct and the inwardly facing surface of the venturi register, after the replacement burner system is accommodated within the windbox of a combustion boiler.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: April 8, 2014
    Assignee: Fuel Tech, Inc.
    Inventors: Peter D. Marx, Robert W. Pickering, Charles E. Trippel
  • Patent number: 8172566
    Abstract: An apparatus for combustion of a liquid fuel, such as an atomizer or burner, and an associated method using the apparatus for combusting an atomized liquid fuel. The apparatus for combustion has an outer conduit, an inner conduit and a spray tip. The spray tip has a mixing chamber for receiving a liquid fuel and an atomizing gas, and an orifice for discharging the liquid fuel and atomizing gas mixture as an atomized liquid fuel. The inner conduit has external fins where at least some of the external fins contact the inner surface of the spray tip.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: May 8, 2012
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Matthew James Watson, Xiaoyi He
  • Patent number: 7871262
    Abstract: A method and a device for combusting gaseous fuel which contains hydrogen or consists of hydrogen, includes a burner which provides a swirl generator (1) into which liquid fuel is feedable centrally along a burner axis (A), forming a liquid fuel column which is conically formed and which is enveloped by, and mixed through with, a rotating combustion air flow which flows tangentially into the swirl generator (1). The gaseous fuel is fed inside the swirl generator (1) largely axially and/or coaxially to the burner axis (A), forming a fuel flow with a largely spatially defined flow pattern (9) which is maintained inside the burner and bursts open in the region of the burner outlet.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: January 18, 2011
    Assignee: ALSTOM Technology Ltd.
    Inventors: Richard Carroni, Timothy Griffin
  • Publication number: 20100139324
    Abstract: An internal combustion burner including a combustion chamber supplied with fuel and with oxidant and at least two combustion devices supplied with oxidant and with fuel. Combining two combustion devices of distinct configurations, which respectively generate two distinct types of flames with a system for cooling the walls of the burner by introducing air along the walls, makes it possible to obtain a burner that supplies a combustion gas temperature of up to 1700° C., while at the same time being easily cooled and occupying very little space so that it can, for example, be housed in an existing installation used in the manufacture of rock wool or glass wool.
    Type: Application
    Filed: April 7, 2008
    Publication date: June 10, 2010
    Applicant: SAINT- GOBAIN ISOVER
    Inventors: Oleg Boulanov, Christopher Ellison
  • Patent number: 7585170
    Abstract: An animal and vegetable oils combustor, wherein primary air is introduced into a burner tile in the form of straight-ahead air flow moving straight ahead along the axial direction of the burner tile and secondary air is introduced in the form of swirl air flow moving along the inner surface of the side wall of the burner tile, whereby perfect combustion is liable to occur since a centrifugal force acts on liquid-drop fuel by swirl air flow to diffuse the fuel in the radial direction and the liquid-drop fuel does not take such a route as to be adhered to the inner wall even if char is included in the liquid drop fuel since the fuel is jetted after the grain size thereof is adjusted to small one beforehand.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: September 8, 2009
    Assignees: Yamaichi Metal Co., Ltd., Yamaichi New Technology Co., Ltd.
    Inventors: Shigeru Oga, Hiromitsu Iwasaki, Toshikazu Oga, Makoto Oga
  • Patent number: 7549858
    Abstract: Heating provided by a burner that combusts hydrocarbon fuel can be provided at a sequence of different heat transfer rates by adjusting the total oxygen concentration of oxidant streams fed to the burner. A burner with which the method can be practiced is also disclosed.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: June 23, 2009
    Assignee: Praxair Technology, Inc.
    Inventors: William Thoru Kobayashi, Abilio Tasca, Francisco Dominques Alves De Sousa
  • Patent number: 7430970
    Abstract: A new burner apparatus and method of combusting fossils fuels for commercial and industrial application is provided wherein the new burner apparatus achieves low NOx emissions by supplying oxygen to the center of the burner flame in as manners so as to create a fuel rich internal combustion zone within the burner flame.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: October 7, 2008
    Inventors: Albert D. LaRue, Alan N. Sayre, William J. Kahle, Hamid Sarv, Daniel R. Rowley
  • Patent number: 7273366
    Abstract: A burner assembly for the destruction of noxious vapors and other waste streams includes an inner burner element in the form of a sudden expansion burner and an outer burner element that encircles the inner burner element and forms an annular passageway between the two elements. Waste vapors may be conducted directly into the flame of the inner burner element (direct inject) or routed through the annular passageway and preheated, for injection at the flame or beyond. The burner elements may include solid or perforated cones mounted on their exits to enhance mixing and injection of the streams. The burner assembly may be configured as in inline duct burner. A wide range of contaminants may be processed because waste streams having primarily nonflammable or combustion inhibiting constituents may be processed.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: September 25, 2007
    Assignee: Soil-Therm Equipment, Inc.
    Inventor: Mark L. Sujata
  • Patent number: 7229483
    Abstract: A method for gasifying carbonaceous materials to fuel gases comprises the formation of an ultra-superheated steam (USS) composition substantially containing water vapor, carbon dioxide and highly reactive free radicals thereof, at a temperature of about 2400° F. (1316° C.) to about 5000° F. (2760° C.). The USS composition comprising a high temperature clear, colorless flame is contacted with a carbonaceous material for rapid gasification/reforming thereof. The need for significant superstoichiometric steam addition for temperature control. Methods for controlling a gasification/reforming system to enhance efficiency are described. A USS burner for a fluidized bed gasification/reforming reactor, and methods of construction, are described.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: June 12, 2007
    Inventor: Frederick Michael Lewis
  • Patent number: 6946101
    Abstract: A burner for producing carbon black, includes a combustion chamber which can be supplied with fuel gas and an oxidizing gas in such a way that a diffusion flame producing carbon black particles is generated in the combustion chamber. The burner is also provided with a carbon-black discharge line. Carbon black formed in the combustion chamber can be discharged via an opening in the combustion chamber which feeds into the carbon-black discharge line. The discharge line is also provided with an opening through which an extinguishing gas can be supplied to the carbon-line. The burner permits the stable and reproducible production of carbon black particles which present well defined chemical and physical characteristics.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: September 20, 2005
    Inventor: Lianpeng Jing
  • Patent number: 6901760
    Abstract: An aerodynamically stabilized premixing burner includes a swirl generator for the production of a rotating combustion air flow, and a device for the introduction of at least one fuel into this combustion air flow. The burner is advantageously provided with a device for the introduction of an axial air flow into the center of the generated rotational flow. This axial air flow is controllable in order to affect the position and intensity of the flame-stabilizing recirculation zone at the burner mouth.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: June 7, 2005
    Assignee: Alstom Technology LTD
    Inventors: Rolf Dittmann, Christian Steinbach
  • Patent number: 6685462
    Abstract: Improved apparatus for burning fuel with low NOx formation are provided. An apparatus of the invention for discharging a mixture of fuel gas and air into a furnace wherein the mixture is burned and flue gases having a low NOx content are formed includes the following. A burner housing, attached to a furnace, is provided having a means for mixing a first portion of the fuel gas with a first portion of the air to form a primary fuel gas-air mixture and discharging the primary fuel gas-air mixture into a primary burning zone in the furnace from at least one discharge location surrounded by a wall which extends into the furnace. A means for mixing a second portion of the fuel with a second portion of the air to form a secondary fuel gas-air mixture is also provided whereby the secondary fuel gas-air mixture is discharged into a secondary burning zone in the furnace from at least one discharge location adjacent to an exterior side of the wall.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: February 3, 2004
    Assignee: John Zink Company, LLC
    Inventors: Andrew P. Jones, Danny L. Christenson
  • Patent number: 6652268
    Abstract: A burner assembly including a housing having an air inlet and a burner end. An impeller that is mounted in the housing is in communication with the air inlet and adapted to direct air toward the burner end of the housing. The burner assembly also includes an inner air tube that is mounted in the burner end of the housing so as to define an inner combustion zone and an outer combustion zone.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: November 25, 2003
    Assignee: Astec, Inc.
    Inventors: Bruce C. Irwin, Russell Fountain, Malcolm Swanson, Joseph Unjakoti, Michael Swanson
  • Patent number: 6613992
    Abstract: The present invention is a power outlet having a face plate connected to a modular platform which is used to support a safety device. The modular platform is sized to accommodate varying sized safety devices, such as circuit breakers. The modular platform can have a plurality of reinforcing members which are used to strengthen the modular platform when supporting the safety device. The modular platform can also include a plurality of reinforcing ribs to further increase the rigidity of the modular platform. A support member is used in conjunction with a circuit breaker placed on the modular platform to further strengthen and stiffen the overall connection between the circuit breaker of the safety device, the modular platform and the face plate.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: September 2, 2003
    Assignee: Thomas & Betts International, Inc.
    Inventor: Charles E. Whipple
  • Publication number: 20020197574
    Abstract: Improved methods and apparatus for burning fuel with low NOx formation are provided. A method of the invention for discharging a mixture of fuel gas and air into a furnace wherein the mixture is burned and flue gases having a low NOx content are formed includes the following steps. A first portion of the fuel gas is mixed with a first portion of the air to form a primary fuel gas-air mixture. The primary fuel gas-air mixture is discharged into a primary burning zone in the furnace from at least one discharge location surrounded by a wall which extends into the furnace. A second portion of the fuel and a second portion of the air are mixed to form a secondary fuel gas-air mixture. The secondary fuel gas-air mixture is discharged into a secondary burning zone in the furnace from at least one discharge location adjacent to an exterior side of the wall.
    Type: Application
    Filed: June 25, 2001
    Publication date: December 26, 2002
    Inventors: Andrew P. Jones, Danny L. Christenson
  • Patent number: 6497118
    Abstract: In furnaces for producing high purity fused silica glass boules, the refractory in the area of the burner holes reaches such elevated temperatures that cause impurities to leach out and the dissociation of the refractory, causing contamination of the silica glass. In order to reduce the temperature of the burner hole refractory, a porous insert or liner is positioned within the burner hole and a suitable gas is supplied thereto. The gas diffuses through the porous liner and not only cools the liner and refractory, but also forms a boundary layer along an inside surface of the insert that prevents particle buildup. The cooling of the insert and surrounding burner hole refractory prevents contamination of the silica glass from the refractory.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: December 24, 2002
    Assignee: Corning Incorporated
    Inventor: Paul M. Schermerhorn
  • Patent number: 6491514
    Abstract: A burner box assembly for a combustion air furnace includes a back wall, opposed side walls and top and bottom walls defining an interior space for one or more burner nozzles. A combustion air inlet opening is formed in the top wall and is covered by a generally rectangular inverted channel-shaped airflow guide and baffle member. A second generally rectangular box-shaped louvered airflow guide and baffle member is mounted on the interior side of the top wall over the combustion air inlet opening for distributing the flow of combustion air into the burner box assembly and to reduce acoustic emissions from the burner box assembly through the combustion air inlet opening. The combination of the louvered baffle member and the exterior mounted baffle member provides reduced acoustic emissions from the burner box assembly as well as more evenly distributed combustion airflow into and through the burner box assembly.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: December 10, 2002
    Assignee: Lennox Industries, Inc.
    Inventors: Nabil George Hamad, Darcy Quentin Easterling, Glenn William Kowald
  • Patent number: 6488496
    Abstract: A combination burner for selectively firing oil, natural gas and liquid propane. A modular first section has primary and secondary air tubes coaxially arranged therein and communicates with the main combustion air supply fan. A modular section is joined by bolts or the like to the first section and into which the primary and secondary air tubes extend. A center air spin vane rack is upstream of the secondary air tube in the first section. An adjustable spin vane rack is located radially outwardly of the secondary air tube for selectively spinning the main combustion air for flame adjustability. An air diverter is provided at a downstream end of the primary air tube. A compressed air atomizer is also at the downstream end of the primary air tube.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: December 3, 2002
    Assignee: Hauck Manufacturing Co.
    Inventors: James J. Feese, Raymond F. Baum, Edward E. Moore, Bruce C. Irwin
  • Patent number: 6419713
    Abstract: The invention concerns a solid or liquid fuel composition capable while burning of producing a selected and varied colored flame other than the color of a standard flame. The composition comprises triethanolamine and a color-forming agent. The invention also concerns a candle or lighting device with a colored flame prepared from the composition. The invention further concerns a method for making a candle with a colored flame comprising the steps of casting the composition into a mold wherein a wick has previously been fixed, cooling the cast composition, and removing the cooled composition from the mold.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: July 16, 2002
    Assignee: Regal Universal Ltd.
    Inventors: Gérard Durand, Bandombélé Mokili, Jean-Pierre Rives, Bruno Legrand
  • Patent number: 6347935
    Abstract: A round burner capable of being operated with reduced CO and NOx emissions includes a venturi tube positioned to direct a flow of air through the burner and into a combustion zone in a combustion chamber through an entrance in a wall of the combustion chamber. The venturi tube has inlet and outlet ends and a throat. The outlet end of the venturi tube has a larger internal diameter than either the inlet end or the throat and the same is positioned adjacent the entrance to the combustion chamber. The inlet end of the venturi tube is also positioned further from the entrance than the outlet end of the venturi tube. The burner may include a duct system that includes an inlet disposed in fluid communication with the combustion zone and an outlet disposed in fluid communication with the venturi tube adjacent the throat thereof.
    Type: Grant
    Filed: June 17, 1999
    Date of Patent: February 19, 2002
    Assignee: John Zink Company, L.L.C.
    Inventors: Edmund Schindler, Lev Tsirulnikov, John Guarco, Jon Moore, Michael Gamburg
  • Publication number: 20010049079
    Abstract: A powered multi-fuel burner has a burner assembly which utilizes an air aspirated nozzle and an infra-red type configuration. An air compressor provides air to the air aspirated nozzle and a fuel tank holds fuel supplied to the air aspirated nozzle by operation of the suction created at the nozzle. A metering valve is interposed between the fuel tank and the air aspirated nozzle. The metering valve is manually adjustable to increase or decrease the fuel supplied to the nozzle thereby to increase or decrease the heat output of the burner.
    Type: Application
    Filed: May 5, 1997
    Publication date: December 6, 2001
    Inventors: EDGAR C. ROBINSON, LEONARD FLEMING
  • Patent number: 6237510
    Abstract: A combustion burner includes a mixture nozzle (2) defining a mixture fluid passage through which a mixture fluid (1) containing pulverized coal and conveyor gas flows toward a furnace, secondary and tertiary air passages surrounding the mixture nozzle (2), through which secondary air (6) and tertiary air (9) for combustion purposes flow, respectively; and air injection nozzles (24) provided in the vicinity of an outer periphery of a distal end of the mixture nozzle (2). The air (21) is injected from the air injection nozzles (24) toward the axis of the mixture nozzle, so that the high-temperature gas in the vicinity of the outer periphery of the distal end of the mixture nozzle (2) is drawn into the mixture fluid (1) in the vicinity of the outer periphery of this distal end.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: May 29, 2001
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Toshikazu Tsumura, Kenji Kiyama, Tadashi Jimbo, Shigeki Morita, Koji Kuramashi, Kunio Okiura, Shinichiro Nomura, Miki Mori, Noriyuki Ohyatsu, Noboru Takarayama, Toshihiko Mine, Hironobu Kobayashi, Hirofumi Okazaki
  • Patent number: 6196142
    Abstract: A method and apparatus for introducing solid, liquid or gaseous fuel into a burning zone of a rotary kiln for manufacturing cement clinker. Fuel is conducted through a duct or ducts and primary air is conducted through at least two annular ducts arranged substantially concentrically with, and around, the fuel duct(s), the portion of air in one of the air ducts flowing substantially axially, whereas the portion of air in the second of the air ducts comprises air which has a rotary component about the center axis of the burner, and wherein the amount of primary air in the two portions is independently controlled, such that the two portions of primary air are mixed at a lower velocity in a collecting duct into a single primary mixed airstream having a desired axial/rotary flow characteristic, and wherein this airstream is subsequently accelerated up to a desired, higher discharge velocity.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: March 6, 2001
    Assignee: F. L. Smidth & Co., A/S
    Inventor: Ib Ohlsen
  • Patent number: 6162049
    Abstract: A ported, premixed extendable burner provides increased turndown capability relative to conventional burners. The burner has an adjustable flameholder sleeve which can be extended and retracted relative to a flameholder, to increase and decrease the available flameholder area. The burner is suitable for use in modulated heating applications and other applications where high turndown ratios are desired.
    Type: Grant
    Filed: March 5, 1999
    Date of Patent: December 19, 2000
    Assignee: Gas Research Institute
    Inventors: Roberto O. Pellizzari, Johannes H. J. Thijssen, Scott Macadam
  • Patent number: 5993199
    Abstract: A burner design for use especially with rotary dryers is provided, in which a primary firing tube is provided with an oil body disposed proximate the burner tip portion of the firing tube, the oil body being constructed to divide an airflow into an outer portion flowing through an outer airstream passageway and an inner portion flowing through an inner airstream passageway, and to cause said inner and outer portions to intersect each other proximate the burner tip portion. The oil body is further provided with a slit opening on an inner surface thereof along a boundary of the inner airstream passageway, the slit opening being in fluid communication with a supply of fuel oil, whereby fuel oil can be delivered at low pressure at an inner surface of the oil body, whereupon the inner airstream portion will cause the fuel oil to film along the inner surface of the oil body and to be intersected by the inner and outer airstream portions to atomize the fuel oil at the burner tip.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: November 30, 1999
    Inventor: Charles R. Safarik
  • Patent number: 5983809
    Abstract: A burner assembly in which an inlet is provided for receiving a mixture of particulate fuel and air, an outlet extending at an angle to the axis of said inlet. A passage connects the inlet and the outlet for passing a portion of the mixture directly from the inlet to the outlet, and a chamber communicates with the inlet for receiving a second portion of the mixture. The chamber is constructed and arranged to swirl the second mixture portion and direct it towards the passage for passing to the outlet. As a result, particle fracture and friction losses are minimized and the burner assembly can operate at relatively low pressures.A burner section communicates with the inlet section and includes an inlet for receiving the fuel-air mixture from the outlet of the inlet section, and an outlet for discharging the mixture into a furnace.
    Type: Grant
    Filed: February 6, 1996
    Date of Patent: November 16, 1999
    Assignee: Foster Wheeler Energy International, Inc.
    Inventor: Joel Vatsky
  • Patent number: 5979342
    Abstract: A burner for the combustion of coal dust in which a stream of primary air and coal dust mixture is conducted through a dust conduit connected to a primary dust tube. A secondary air tube surrounds the primary dust tube, and a tertiary air tube surrounds the secondary air tube. The secondary and tertiary air tubes are connected to a helically-shaped input housing, and a conically flared section extends from each of the secondary and tertiary air tubes. An angular momentum is applied in the dust conduit divides the primary air and coal dust mixture into high-dust and low-dust partial streams, so that the high-dust partial stream flows through the primary dust tube, and the low-dust partial stream flows through the primary gas tube.
    Type: Grant
    Filed: August 14, 1998
    Date of Patent: November 9, 1999
    Assignee: Babcock Lentjes Kraftwerkstechnik GmbH
    Inventors: Alfons Leisse, Michael Streffing
  • Patent number: 5878676
    Abstract: A burner is provided for a furnace having at least one windbox that is supplied with air for combustion and has extending therethrough at least one such burner, which opens out toward the combustion chamber. The burner has at least one primary air channel, which is supplied from the outside with a coal dust/air mixture, at least one secondary air channel, which surrounds the primary air channel, and at least one tertiary air channel, which surrounds the secondary air channel. The secondary and tertiary air channels can be supplied with air from the windbox in a regulated manner. Along a rotationally symmetrical portion of an outer surface of each of the secondary and tertiary air channels there is respectively provided at least one air inlet opening. Respective annular valve sections are rotatably disposed about one of the rotationally symmetrical portions of the secondary and tertiary air channels.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: March 9, 1999
    Assignee: L. & C. Steinmuller GmbH
    Inventors: Matthias Jochem, Hans-Ulrich Thierbach
  • Patent number: 5727480
    Abstract: An over-fire air control system for a pulverized fuel furnace, in which a burner assembly is provided for discharging a fuel/primary air mixture along with secondary air to combust the fuel. The amount of primary air and secondary air discharge is controlled to achieve incomplete combustion, and an overfire air port is provided through which additional air is discharged to complete the combustion. The overfire air port receives two streams of air, one high in volume and low in velocity and the other low in volume and high in velocity. Dampers are provided for controlling the air streams to achieve optimum quantifies and velocities of the air. According to one embodiment, a source of one of the air streams is the primary air portion of the fuel/primary air mixture applied to the burner assembly. As a result, the formation of nitrous oxides are reduced and fairly precise air fuel ratios can be maintained despite variations in the quality of the fuel and the pressure and amount of primary air.
    Type: Grant
    Filed: April 17, 1996
    Date of Patent: March 17, 1998
    Assignee: Foster Wheeler International, Inc.
    Inventor: Juan Antonio Garcia-Mallol
  • Patent number: 5700143
    Abstract: A combination burner which uses primary and secondary fuel injection and improves liquid propane combustion. The burner supplies primary air, while secondary air is swirled to shape and mix the flame when the burner is firing "on oil". When the burner is firing "on gas", primary air enters the burner through an annulus at the atomizing air pipe or conduit so as to have the primary gas enter that pipe; secondary gas is injected radially into the air stream at a downstream location relative to an atomizing nozzle. In using liquid propane (butane) to fire the burner, two stage fuel injection is used, with a stream of fuel being injected upstream and toward the burner centerline and another stream of fuel being injected downstream and outwardly away from the burner centerline.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: December 23, 1997
    Assignee: Hauck Manufacturing Company
    Inventors: Bruce C. Irwin, Edward E. Moore, Raymond F. Baum
  • Patent number: 5655899
    Abstract: A fuel injector has an inner pipe within an outer pipe. The distal end of the inner pipe is set back from the distal end of the outer pipe to create a flame stabilization and mixing zone. A combustible gas and air mixture injected through the outer pipe forms a flame shroud around a gas stream injected through the inner pipe. This injector provides increased flame penetration and improved NO.sub.x reduction particularly when used to inject a flame shrouded gas stream into regions of the furnace at which the flue gas is at a temperature not greater than 2400.degree. F.
    Type: Grant
    Filed: April 6, 1995
    Date of Patent: August 12, 1997
    Assignee: Gas Research Institute
    Inventors: Harjit S. Hura, Bernard P. Breen, James C. McMichael
  • Patent number: 5572862
    Abstract: An annular combustor system has an annular housing defining a single stage combustor, an external fuel/air premixer system to provide a preselected, nominally constant lean fuel/air ratio mixture for introduction to the combustion zone of the annular housing. Compressed air conduits channel a portion of the total compressed air flow to the premixer and the remainder to the dilution zone of the combustor. Convection cooling of the annular housing and the turbine shroud is accomplished using essentially the remainder portion of the compressed air without diluting the fuel air ratio in the combustion zone. The premixer includes a venturi, and a fuel nozzle for spraying fuel into the venturi inlet along the venturi axis to provide admission of the fully premixed fuel/air mixture.
    Type: Grant
    Filed: November 29, 1994
    Date of Patent: November 12, 1996
    Inventor: R. Jan Mowill
  • Patent number: 5569029
    Abstract: A burner with a burner head (B) and a flame tube (F) is provided, with the burner head (B) having a concentric outlet arrangement of air and fuel feed nozzles. Following this a mixture of low-nitrogen air and fuel is produced, which is ignited in a chamber (11) in the interior of a hollow body (20). Hard-to-burn, noncombusted gas compounds flow upon exiting from the hollow body (20) along the exterior surface thereof back into the region before the hollow body (20) and flow again together with low-nitrogen air into the chamber (11) for combustion. This additional combustion increases the energy yield of the fuel and reduces the quantity of pollutants in the exhaust.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: October 29, 1996
    Assignee: PPV Verwaltungs AG
    Inventor: Gunter Poschl
  • Patent number: 5545033
    Abstract: The oxygen/fuel burner contains at least one first tubular component (2) conveying the oxidant and at least one second tubular component (3), for injecting the fuel into the oxidant flow,arrangd asymmetrically with respect to the first (2) so that the mixing region upstream of the flame contains a part where the ratio of the oxidant to the fuel is less than the soichiometric value.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: August 13, 1996
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation Des Procedes Georges Claude
    Inventors: Sami Dick, Patrick Recourt, Serge Laurenceau
  • Patent number: 5527180
    Abstract: A burner has a burner tube and a nozzle holder mounted in one end of the burner tube. An igniter is positioned within the nozzle holder and acts to ignite any of the multi-liquid fuels which may be used with the burner. A nozzle emits atomized liquid fuel under the venturi effect of the nozzle with compressed air being supplied to the nozzle. Primary air holes extend circumferentially around the nozzle holder to admit air radially which passes directly to the burner tube. Secondary air holes extend around the inside circumference of the burner tube on the secondary air injection plate and admit air axially to the burner tube.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: June 18, 1996
    Assignee: International Thermal Investments Ltd.
    Inventors: Edgar C. Robinson, Leonard Fleming
  • Patent number: 5522696
    Abstract: The present invention provides an air box throttle assembly for improved characterization of a combustion system in which an arrangement of three air shutters is used to maintain a fairly constant air to fuel ratio as the combustion system is driven from low fire to high fire. A high fire shutter and a main air shutter each comprise two vanes and are rotatably mounted within an air intake box for a combustion system. A low fire shutter is provided with a single vane and is fixed above the main air shutter. The high fire shutter is the principal regulator of large volumes of air entering the combustion system when operating at high fire. At high fire, the main air shutter is fully open and low fire shutter has little effect on the flow of air through the air intake box. Low fire shutter is the principal regulator of small volumes of air entering the combustion system when operating at low fire.
    Type: Grant
    Filed: January 4, 1995
    Date of Patent: June 4, 1996
    Assignee: Aqua-Chem, Inc.
    Inventor: Tod A. Stansfield
  • Patent number: 5511970
    Abstract: A burning method provides a versatile burner by promoting rapid mixing and a stable flame to reduce NO.sub.x and CO emissions over a wide operating range. The burner includes a primary fuel supply, a combustion air supply arranged to supply combustion air at low pressure, and a swirler for swirling the combustion air. When the primary fuel supply is gaseous fuel, the gaseous fuel is introduced axially into the swirling combustion air. Secondary gas nozzles are arranged at the exit of the burner to supply and mix boost gas for combustion with the combustion air when the gaseous fuel is the primary fuel supply. An atomizer is arranged for atomizing liquid fuel when the primary fuel supply is a liquid fuel.
    Type: Grant
    Filed: January 24, 1994
    Date of Patent: April 30, 1996
    Assignee: Hauck Manufacturing Company
    Inventors: Bruce C. Irwin, Edward E. Moore, Raymond F. Baum
  • Patent number: 5489202
    Abstract: A system and method for resisting thermoacoustic oscillations in systems comprised of hot and cold components is disclosed. More particularly, a combined cycle power generation system 32 having a gas turbine 40, a gas turbine discharge duct 34, and a gas turbine recuperator 36 and 38 is disclosed. The system 32 is designed to resist severe thermoacoustic oscillations over its entire load range by providing for an asymmetrical arrangement of the hot section L-l, including the gas discharge duct 34 and the plenum 36 of the recuperator, and the cold section L-l, including the heat exchange tubes 38 of the recuperator. Also disclosed is a steam generation system 42 having a plenum 46, a burner 48, and a furnace 44. The steam generation system 42 is also designed to resist severe thermoacoustic oscillations by providing for an appropriate burner length L and by providing for an asymmetrical arrangement of a hot burner section L-l and a cold burner section l within the burner 48.
    Type: Grant
    Filed: February 2, 1994
    Date of Patent: February 6, 1996
    Assignee: Foster Wheeler Energy Corporation
    Inventor: Frantisek L. Eisinger
  • Patent number: 5431559
    Abstract: A burner assembly is provided for combining oxygen and fuel to produce a flame. The burner assembly includes a burner block including a combustion chamber and a nozzle discharging an oxygen and fuel mixture into a first stage region formed in the combustion chamber. First stage oxygen is supplied to the first stage region in the combustion chamber to combine with the oxygen and fuel mixture discharged into the first stage region by the nozzle. Second stage oxygen is also delivered to a downstream second stage region in the combustion chamber in sequence through an oxygen delivery tube, a flow regulator plate, and then an oxygen-conducting passage formed in the burner block. The flow regulator plate has a fixed-diameter oxygen-flow orifice having an internal diameter that is less than the internal diameter of the oxygen delivery tube to meter the flow of second stage oxygen discharged into the second stage region so as to apportion oxygen flow between the first and second stage regions.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: July 11, 1995
    Assignee: Maxon Corporation
    Inventor: Curtis Taylor
  • Patent number: 5411394
    Abstract: Low NO.sub.x burners for the combustion of gaseous, liquid and solid fuels. The fluid dynamic principle of radial stratification by the combustion of swirling flow and a strong radial gradient of the gas density in the transverse direction to the axis of flow rotation is used to damp turbulence near the burner and hence to increase the residence time of the fuel-rich pyrolyzing mixture before mixing with the rest of the combustion air to effect complete combustion.
    Type: Grant
    Filed: October 5, 1993
    Date of Patent: May 2, 1995
    Assignee: Massachusetts Institute of Technology
    Inventors: Janos M. Beer, Alessandro Marotta, Majed A. Toqan
  • Patent number: 5408943
    Abstract: A burner assembly in which an annular passage is provided for transporting an fuel/air mixture to a furnace inlet. A conical divider member is disposed within the annular passage for dividing the stream of fuel/air passing through the passage into two radially-spaced coaxial, passages. A plurality of angularly-spaced walls are disposed within one of said passages for dividing the latter passage into a plurality of segments for splitting up fuel/air stream so that, upon ignition of said fuel, a plurality of flame patterns are formed. Ribs are provided on one of the surfaces defining the other passage to concentrate the fuel portion of the mixture flowing through said latter passage to form an additional flame pattern which is surrounded by the above-mentioned plurality of flame patterns.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: April 25, 1995
    Assignee: Foster Wheeler Energy Corporation
    Inventor: Joel Vatsky
  • Patent number: 5391075
    Abstract: A burner has a burner tube and a nozzle holder mounted in one end of the burner tube. An igniter is positioned within the nozzle holder and acts to ignite any of the multi-liquid fuels which may be used with the burner. A nozzle emits atomized liquid fuel under the venturi effect of the nozzle with compressed air being supplied to the nozzle. Primary air holes extend circumferentially around the nozzle holder to admit air radially which passes directly to the burner tube. Secondary air holes extend around the inside circumference of the burner tube on the secondary air injection plate and admit air axially to the burner tube.
    Type: Grant
    Filed: July 9, 1993
    Date of Patent: February 21, 1995
    Inventors: Edgar C. Robinson, Leonard Fleming
  • Patent number: 5347937
    Abstract: A burner assembly in which an annular passage is provided for transporting an fuel/air mixture to a furnace inlet. A conical divider member is disposed within the annular passage for dividing the stream of fuel/air passing through the passage into two radially-spaced coaxial, passagaes. A plurality of angularly-spaced walls are disposed within one of said passages for dividing the latter passage into a plurality of segments for splitting up fuel/air stream so that, upon ignition of said fuel, a plurality of flame patterns are formed. Ribs are provided on one of the surfaces defining the other passage to concentrate the fuel portion of the mixture flowing through said latter passage to form an additional flame pattern which is surrounded by the above-mentioned plurality of flame patterns.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: September 20, 1994
    Assignee: Foster Wheeler Energy Corporation
    Inventor: Joel Vatsky