Patents by Inventor Reijo Kuivalainen

Reijo Kuivalainen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9651244
    Abstract: A method of operating an oxycombustion circulating fluidized bed (CFB) boiler that includes a furnace having a grid at its bottom section, a solid material separator connected to an upper part of the furnace, and an external solid material handling system. Oxidant gas is introduced into the CFB boiler through the grid as fluidizing gas, the fluidizing gas including recirculating flue gas. Fuel material is introduced into the circulating fluidized bed. A sulfur reducing agent including CaCO3 is introduced into the circulating fluidized bed. Solid material is circulated out of the furnace and provides an external circulation of solid material via the external solid material handling system. The solid material is fluidized in the external solid material handling system by introducing a fluidizing medium including recirculating flue gas into the handling system. A predetermined amount of steam is introduced into the handling system as a component of the fluidizing medium.
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: May 16, 2017
    Assignee: AMEC FOSTER WHEELER ENERGIA OY
    Inventors: Reijo Kuivalainen, Timo Eriksson, Arto Hotta
  • Patent number: 9579600
    Abstract: Sulfurous fuel and CaCO3-containing sorbent are combusted in a furnace of a circulating fluidized bed boiler. A dry circulating fluidized bed scrubber includes a reactor with water and Ca(OH)2 feeds for converting SO2 in the exhaust gas to CaSO3 and CaSO4 and a dust separator in gas flow connection with the reactor. A discharge removes CaO-containing bottom ash from the furnace. A classifier classifies a portion of the removed CaO-containing bottom ash into coarse and finer portions. A fine ash channel conveys some of the finer bottom ash portion from the classifier to a grinder. A ground ash channel conveys some of the ground bottom ash portion from the grinder to a hydrator to hydrate CaO in the ash to Ca(OH)2. A hydrated ash channel conveys some of the Ca(OH)2 from the hydrator to the dry circulating fluidized bed scrubber as a sorbent.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: February 28, 2017
    Assignee: AMEC FOSTER WHEELER ENERGIA OY
    Inventors: Tobias Brand, Reijo Kuivalainen, Maria-Helena Möbs, Rolf Graf
  • Patent number: 9533257
    Abstract: A scrubber for removing pollutant compounds from a gas stream. At least one gas channel introduces the gas stream to a lower portion of the scrubber. An inlet chamber directs the gas stream upwards to form a vertical gas stream. A constriction section has a vertical axis of symmetry and includes a centrally arranged venturi nozzle, and is above and in flow connection with an upper end of the inlet chamber for accelerating the vertical gas stream. A reaction chamber is arranged above and in flow connection with the constriction section. A reagent in the reaction chamber converts pollutant compounds in the gas stream to reaction products. A discharge channel in flow connection with the reaction chamber discharges gas and particles including the reaction products from the reaction chamber. A particle separator separates particles from the gas. A return channel recycles a portion of the particles to the reaction chamber.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: January 3, 2017
    Assignee: AMEC FOSTER WHEELER ENERGIA OY
    Inventors: Winfried Gutperl, Rolf Graf, Harald Kessler, Reijo Kuivalainen
  • Publication number: 20160332117
    Abstract: A scrubber for removing pollutant compounds from a gas stream. At least one gas channel introduces the gas stream to a lower portion of the scrubber. An inlet chamber directs the gas stream upwards to form a vertical gas stream. A constriction section has a vertical axis of symmetry and includes a centrally arranged venturi nozzle, and is above and in flow connection with an upper end of the inlet chamber for accelerating the vertical gas stream. A reaction chamber is arranged above and in flow connection with the constriction section. A reagent in the reaction chamber converts pollutant compounds in the gas stream to reaction products. A discharge channel in flow connection with the reaction chamber discharges gas and particles including the reaction products from the reaction chamber. A particle separator separates particles from the gas. A return channel recycles a portion of the particles to the reaction chamber.
    Type: Application
    Filed: January 31, 2014
    Publication date: November 17, 2016
    Inventors: Winfried Gutperl, Rolf Graf, Harald Kessler, Reijo Kuivalainen
  • Publication number: 20160201903
    Abstract: Sulfurous fuel and CaCO3-containing sorbent are combusted in a furnace of a circulating fluidized bed boiler. A dry circulating fluidized bed scrubber includes a reactor with water and Ca(OH)2 feeds for converting SO2 in the exhaust gas to CaSO3 and CaSO4 and a dust separator in gas flow connection with the reactor. A discharge removes CaO-containing bottom ash from the furnace. A classifier classifies a portion of the removed CaO-containing bottom ash into coarse and finer portions. A fine ash channel conveys some of the finer bottom ash portion from the classifier to a grinder. A ground ash channel conveys some of the ground bottom ash portion from the grinder to a hydrator to hydrate CaO in the ash to Ca(OH)2. A hydrated ash channel conveys some of the Ca(OH)2 from the hydrator to the dry circulating fluidized bed scrubber as a sorbent.
    Type: Application
    Filed: November 22, 2013
    Publication date: July 14, 2016
    Inventors: Tobias Brand, Reijo Kuivalainen, Maria-Helena Möbs, Rolf Graf
  • Publication number: 20130284121
    Abstract: A method of operating an oxycombustion circulating fluidized bed (CFB) boiler that includes a furnace having a grid at its bottom section, a solid material separator connected to an upper part of the furnace, and an external solid material handling system. An oxidant gas is introduced into the CFB boiler through the grid as fluidizing gas, the fluidizing gas including recirculating flue gas. Fuel material is introduced into the circulating fluidized bed. A sulfur reducing agent including CaCO3 is introduced into the circulating fluidized bed. Solid material is circulated out of the furnace and provides an external circulation of solid material via the external solid material handling system. The solid material is fluidized in the external solid material handling system by introducing a fluidizing medium including recirculating the gas into tire external solid material handling system.
    Type: Application
    Filed: February 1, 2012
    Publication date: October 31, 2013
    Inventors: Reijo Kuivalainen, Timo Eriksson, Arto Hotta
  • Patent number: 6994497
    Abstract: An apparatus for pneumatically conveying particulate material containing reaction products of a high pressure reactor from a supply vessel at a pressure of at least two bar to a receiving vessel at a considerably lower pressure. The apparatus includes a conveyor line attached to the supply vessel, a collecting vessel between the conveyor line and the receiving vessel, the collecting vessel including (i) a discharge conduit for the carrier gas, (ii) a device for controlling the discharge velocity of the carrier gas from the collecting vessel, and (iii) a device for controlling the pressure of the material collected in the collecting vessel, and a device for conveying the material directly from the collecting vessel to the receiving vessel essentially at the same pressure as is prevailing in the receiving vessel.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: February 7, 2006
    Assignee: Foster Wheeler Energia Oy
    Inventors: Timo Eriksson, Juhani Isaksson, Reijo Kuivalainen, Pekka Lehtonen, Juha Palonen
  • Patent number: 6290921
    Abstract: A method of binding pollutants, such as sulfur dioxide, hydrochloric acid and/or hydrofluoric acid, in flue gas in one or more combustion plants.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: September 18, 2001
    Assignee: Foster Wheeler Enegeria Oy
    Inventors: Reijo Kuivalainen, York Tsuo
  • Patent number: 5480624
    Abstract: Waste gases are purified by adding reagent and/or absorbent which reacts with pollutants in the gases to the gases, and then introducing the gases into a wetting reactor for activating the reagent or absorbent contained in the gases. The gases are introduced into a drying zone of the reactor and then passed upwardly into a wetting zone. The reagent or absorbent which has reacted partly or completely with the pollutants is separated from the gas by a filter in the upper section of the reactor and particles are intermittently detached from the filter and fall downwardly into an ash layer in the bottom of the reactor. The ash layer is capable of homogenizing wet particles and water droplets which fall downwardly from the wetting zone, and typically is at least about 25 cm thick. A mechanical mixer/grinder may be provided in the ash layer for mixing the particles and droplets and grinding lumps in the ash layer into particles.
    Type: Grant
    Filed: March 8, 1994
    Date of Patent: January 2, 1996
    Assignee: A. Ahlstrom Corporation
    Inventor: Reijo Kuivalainen
  • Patent number: 5380498
    Abstract: An apparatus provides purification of waste gases by adding particles of reagent and/or absorbent, which react with the pollutants in the waste gases, to the gases, and by introducing the gases into a wetting reactor for activating the reagent or absorbent contained in the gases. Gases are conveyed to at least two levels in the reactor through inlets so that a first portion of the gases is introduced into a wetting zone and a second portion of the gases below the wetting zone. A high density of particles is maintained in the wetting zone by recycling to the wetting zone particles separated from the gas above the wetting zone.
    Type: Grant
    Filed: February 2, 1994
    Date of Patent: January 10, 1995
    Assignee: A. Ahlstrom Corporation
    Inventor: Reijo Kuivalainen
  • Patent number: 5318755
    Abstract: Hot flue or process gases are cleaned utilizing an apparatus containing a barrier filter module formed of a monolithic ceramic support structure coated with a thin porous ceramic layer having a pore size of about 0.04-0.5 microns, and a catalyst module formed of a support structure coated with catalyst. The hot flue gases may be associated with a fluidized bed boiler plant, such as a circulating fluidized bed reactor. Gases to be cleaned are passed through the barrier filter module into contact with the thin porous ceramic layer, and then through the catalyst module so that there is a catalytic reaction with the gas.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: June 7, 1994
    Assignee: A. Ahlstrom Corporation
    Inventors: Reijo Kuivalainen, Yam Y. Lee, Karukkampalayam M. Sellakumar, Charles M. Davis
  • Patent number: 5284498
    Abstract: A filter assembly for high temperature gases, such as from a circulating fluidized bed reactor, mounts monolithic ceramic filter elements within an upright vessel so that as the hot gas flows from the top toward the bottom of the vessel the gas passes through the elements with the clean gas discharged through a side wall of the vessel. The particle discharge is provided at the bottom of the vessel. Filter supporting elements within the vessel are cooled by cooling fluid, and pulse cleaning elements are associated with each of the filter elements. Flow directing elements within the vessel typically define a generally conical or pyramidal shaped flow directing surface. The flow directing elements may be refractory material bodies, or funnel shaped thin elements (e.g. of metal capable of withstanding high temperature), and may be mounted so that small amounts of movement are possible to accommodate thermal contraction or expansion.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: February 8, 1994
    Assignee: A. Ahlstrom Corporation
    Inventors: Charles M. Davis, Reijo Kuivalainen, Karukkampalayam M. Sellakumar, Folke Engstrom, Juhani Isaksson, Juha Tiensuu
  • Patent number: 5238657
    Abstract: Nozzles are provided for spraying a wetting medium into the gas flow in an activating reactor. The nozzle comprises a nozzle body having a plurality of nozzles The nozzle body is surrounded by a flexible and/or porous casing and a conduit introduces a gaseous medium into the casing. The gas can be introduced in either pulses or continuously. The gas introduced in pulses causes the casing to change its form and, where a perforated or porous casing is used, the continuous gas flow forms a protective gas film around the casing, thus removing the solid material accumulated on the casing.
    Type: Grant
    Filed: April 2, 1992
    Date of Patent: August 24, 1993
    Assignee: A. Ahlstrom Corporation
    Inventor: Reijo Kuivalainen
  • Patent number: 4864944
    Abstract: A fluidized bed reactor (1) comprising a reactor chamber (4) having a gas distributor plate (5) for feeding primary air, and space above said distributor plate (5) is divided into compartments (6) by means of partition walls (7) having discharge openings (9) for feeding secondary air to the circulating bed.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: September 12, 1989
    Assignee: A. Ahlstrom Corporation
    Inventors: Folke Engstrom, Juhani M. Isaksson, Reijo Kuivalainen
  • Patent number: 4841884
    Abstract: In a fluidized bed reactor, nozzles are provided for distributing fluidizing gas from a windbox into the reactor while preventing the backflow of solid particles through the nozzle into the windbox. The nozzle defines an upper part of high heat and wear resistant material adapted to contact the mass of particles. At least one opening is defined in each nozzle through which fluidizing gas passes between the upper part and the windbox, and a solid, though porous, material abuts or defines the opening for allowing the passage of gas while preventing passage of solid particles. The nozzle may comprise a stand pipe having a sintered metal portion disposed below the upper part. Other constructions provide the solid mass as a metal wire mesh acid proof filter, or as a porous ceramic material, or as a high temperature ceramic material. The solid mass may have pores with a pore size of between about 50-1,000 micormeters.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: June 27, 1989
    Assignee: A. Ahlstrom Corporation
    Inventors: Folke Engstrom, Reijo Kuivalainen
  • Patent number: 4753177
    Abstract: A fluidized bed reactor (1) comprising a reactor chamber (4) having a gas distributor plate (5) for feeding primary air, and a space above said distributor plate (5) is divided into compartments (6) by means of partition walls (7) having discharge openings (9) for feeding secondary air to the circulating bed.
    Type: Grant
    Filed: April 30, 1987
    Date of Patent: June 28, 1988
    Assignee: A. Ahlstrom Corporation
    Inventors: Folke Engstrom, Juhani Isaksson, Reijo Kuivalainen
  • Patent number: RE33230
    Abstract: A fluidized bed reactor (1) comprising a reactor chamber (4) having a gas distributor plate (5) for feeding primary air, and a space above said distributor plate (5) is divided into compartments (6) by means of partition walls (7) having discharge openings (9) for feeding secondary air to the circulating bed.
    Type: Grant
    Filed: February 22, 1989
    Date of Patent: June 12, 1990
    Assignee: A. Ahlstrom Corporation
    Inventors: Folke Engstrom, Juhani M. Isaksson, Reijo Kuivalainen