Raw Material And Fuel Premixed Or Specified Fuel Patents (Class 106/758)
  • Patent number: 9709331
    Abstract: The invention relates to a plant and to a method for the production of cement clinker from cement raw meal, the cement raw meal being preheated in a preheating zone, precalcined in a calcining zone, completely burned in a sintering combustion zone and cooled in a cooling zone, solid fuels additionally being burned in an additional combustion region, a firing region being used in the additional combustion region, the solid fuel being introduced into the firing region where it forms a fuel bed over which a supplied oxygen-containing gas flows, the resulting combustion products being removed via a discharge opening and being used in the production of cement clinker. The fuel is supplied via a conveyor device arranged outside the firing region, in such a manner that it moves the fuel bed that is present in the direction towards the discharge opening.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: July 18, 2017
    Assignee: THYSSENKRUPP POLYSIUS AKTIENGESELLSCHAFT
    Inventors: Jochen Altfeld, Ralf Osburg, Tobias Klegraf, Christoph Beyer, Markus Mohr, Karl Lampe, Sebastian Frie
  • Patent number: 8252109
    Abstract: A process for the production of cement which includes the calcination of calcium carbonate-containing raw meal in a calciner heated by combustion of a carbon-containing fuel with a gas including oxygen and from 0 to 80% by volume of carbon dioxide, and substantially free of nitrogen, and isolating the gas produced by combustion and calcination in the calciner.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: August 28, 2012
    Assignee: Lafarge
    Inventors: Colin Paxton, Michael Weichinger
  • Patent number: 7972419
    Abstract: Disclosed is a method for reducing emissions from exhaust gas generated during the grinding and drying of cement raw meal as part of a cement manufacturing process. The invention comprises circuiting the exhaust gas between a raw mill and a clinker cooler. In the clinker cooler at least a portion of said emissions are delivered to a cement kiln in which said emissions are removed by being combusted and/or absorbed.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: July 5, 2011
    Assignee: FLSmidth A/S
    Inventors: Ove L. Jepsen, Steven Miller, Anthony Shave
  • Publication number: 20100037804
    Abstract: The invention provides a process for the production of cement which comprises the calcination of calcium carbonate-containing raw meal in a calciner heated by combustion of a carbon-containing fuel with a gas comprising oxygen and from 0 to 80% by volume of carbon dioxide, and substantially free of nitrogen, and isolating the gas produced by combustion and calcination in the calciner.
    Type: Application
    Filed: October 30, 2007
    Publication date: February 18, 2010
    Applicant: LAFARGE
    Inventors: Colin Paxton, Michael Weichinger
  • Patent number: 7335253
    Abstract: The invention provides a process for preparing a sulphur cement product comprising the following steps: (a) selectively oxidising hydrogen sulphide to elemental sulphur by contacting, in a reaction zone, a hydrogen sulphide containing feed gas and a molecular-oxygen containing gas with a particulate oxidation catalyst under selective oxidation conditions; (b) discharging a stream comprising liquid and/or solid elemental sulphur and particulate oxidation catalyst from the reaction zone; (c) admixing the stream comprising elemental sulphur and particulate oxidation catalyst with at least any one of elemental sulphur, a sulphur cement filler, a sulphur cement modifier, or aggregate at a temperature at which sulphur is molten; (d) solidifying the mixture obtained in step (c) by cooling it to a temperature below the melting temperature of sulphur to obtain the sulphur cement product.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: February 26, 2008
    Assignee: Shell Oil Company
    Inventors: Carolus Matthias Anna Maria Mesters, Marinus Johannes Reynhout, Guy Lode Magda Maria Verbist
  • Patent number: 7229281
    Abstract: A method is described for reducing NOx emissions and improving energy efficiency during mineral processing in a rotary kiln. The method comprises injection of air with high velocity/high kinetic energy into the kiln to reduce or eliminate stratification of kiln gases. The method can be applied to mix gases in a rotary kiln vessel or in a preheater/precalciner vessel.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: June 12, 2007
    Assignees: Cadence Environmental Energy, Inc., Ash Grove Cement Company
    Inventors: Eric R. Hansen, Ralph A. Supelak, James R. Tutt
  • Patent number: 6875267
    Abstract: In order to make sure, for cement clinker production lines with blown injection of dispersible solid fuels such as, for example, coal dust, into the calcinator which is provided with fuel, that an open flame does not occur at the fuel injection point, it is proposed according to the invention that the fuel is fed into a meal intake box that has a sloping raw meal chute and deflector slide and is arranged on the outside of the calcinator and connected to it through a wall opening and the fuel is pre-mixed with the pre-heated raw meal there, and then introduced via the deflector slide into the reaction section of the calcinator in order to form a gas-raw meal-solid fuel-suspension that is uniformly distributed.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: April 5, 2005
    Assignee: KHD Humboldt Wedag AG
    Inventors: Claus-Jürgen Steffler, Wolfgang Müller, Stefan Köllen
  • Publication number: 20040025753
    Abstract: The invention relates to a process for the manufacture of cement, whereby a metal oxide known for its catalytic action in the reduction of nitrogen oxides NOx, selected from the group consisting of CuO, Co3O4, Mn3O4, Fe2O3, SnO2, NiO, ZnO, V2O5 and TiO2 is injected into the cement plant kiln flame and/or the precalcination zone flame if there is one.
    Type: Application
    Filed: October 7, 2002
    Publication date: February 12, 2004
    Applicants: VICAT, CIMENTS VIGIER SA
    Inventors: Paul Brunner, Stephane Marteau
  • Patent number: 6599123
    Abstract: This describes a method for producing cement clinker using petroleum coke with a sulfur content over 4.5% by weight, in conventional equipment and facilities, wherein said method comprises the treatment of the raw mixture to synergistically improve its physical-chemical characteristics combined with the parameter control of the process, in such a way as to obtain a reduction of the clinkering temperature, all as a heretofore-unappreciated way to reduce, as a result, the concentration of SO3 in the calcinated material fed to the rotating kiln, and also usefully increasing with this the calcium sulfate content in the clinker.
    Type: Grant
    Filed: July 13, 2002
    Date of Patent: July 29, 2003
    Inventors: Homero Ramirez-Tobias, Alberto Lazaro-Franco, Juan C. Martinez-Burckhardt, Walter Lopez-Gonzalez
  • Patent number: 6468345
    Abstract: The present invention discloses a process for producing both steam power and the fast-burnt cement clinker/fast burnt modified coal ash simultaneously in one apparatus, the fast-burnt cement clinker/fast-burnt modified coal ash prepared by said process as well as cement products prepared using them as active substance. It also discloses the apparatus suitable for embodying this process. Said process of the present invention possesses the technoligical features of fast-burning and fast-cooling and contributes a good hydraulic cementitious activity to the said fast-burnt cement clinker/fast-burnt modified coal ash which are capable of being directly used as active substance in cement production of high quality.
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: October 22, 2002
    Assignee: The Chinese Academy of Sciences
    Inventors: Xuefang Zhu, Ben'en Liu
  • Patent number: 6391107
    Abstract: Within the known Müller-Kühne process and a corresponding installation, a utilization of a great variety of residual materials can be achieved with optimum process control, both in regard to the production of a raw powder and the fuel, whereby this is made possible in particular in that the raw powder components and the fuel components also are, with respect to the residual materials being used, stored separately, conditioned, and then mixed according to the formulation under strict monitoring. The flue gas is used for preheating the raw powder by adding the cold raw powder to it. This simultaneously removes sticky components from the flue gas. The raw powder preheated in this manner, and also the raw powder or dust recovered in subsequent dedusters are returned to the rotary drum kiln, whereby the solid and other fuels are used and burned with a mutually supportive flame at the opposite end of the rotary drum kiln.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: May 21, 2002
    Assignee: E. Schwenk Baustoffwerke KG
    Inventors: Hanno Reimann, Götz Reimann, Siegfried Meininger
  • Patent number: 6383283
    Abstract: Cement clinker is produced using high sulfur fuels by combusting high sulfur fuel within a kiln. The feed material is introduced at an inlet of preheater of the kiln and is sintered by the combusting fuel to form sintered material. The sintered material is cooled to form cement clinker. The production of the sintered material is controlled by measuring the sulfur content in the cement clinker and using that measurement to control the concentration of oxygen at the reaction and sintering zone of the kiln.
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: May 7, 2002
    Assignee: Cement Petcoptimizer Company
    Inventor: Joseph E. Doumet
  • Patent number: 6183244
    Abstract: An apparatus for producing cement clinker using a high sulfur fuel includes a wet rotary kiln, at least one sulfur analyzer, a controller, and a burner. The wet rotary kiln has a first end and a second end and processes a slurry of a raw material mixed with a certain quantity of coarse grinded high sulfur fuel received at the first end to produce cement clinker. The sulfur analyzer is produces a measure of the sulfur content of the cement clinker. The controller receives the measure from the sulfur analyzer and controls a concentration of oxygen in the kiln based on the measured sulfur content in the clinker end product. The burner is installed in the kiln at the second end and operates to burn a high sulfur fuel.
    Type: Grant
    Filed: September 27, 1999
    Date of Patent: February 6, 2001
    Assignee: Cement Petcoptimizer Company
    Inventor: Joseph Doumet
  • Patent number: 6142771
    Abstract: A method of producing cement clinker using a high sulfur fuel includes introducing raw material into a Lelep-Lepol travelling grate; drying and heating the raw material in the Lelep-Lepol travelling grate while passing the raw material through the Lelep-Lepol travelling grate; transferring the heated and dried raw material from the Lelep-Lepol travelling grate to a rotary kiln; combusting a high sulfur fuel in the rotary kiln; passing the raw material through the rotary kiln in the presence of the combusting fuel so as to sinter the raw material to form a sintered material; measuring a sulfur content of the sintered material; and controlling an excess concentration of oxygen in the rotary kiln based on the measured sulfur content of the clinker end product.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: November 7, 2000
    Assignee: Cement Petcoptimizer Company
    Inventor: Joseph Doumet
  • Patent number: 6050813
    Abstract: Cement clinker is produced using high sulfur fuels by combusting high sulfur fuel within a kiln. The feed material is introduced at an inlet of the kiln and is sintered by the combusting fuel to form sintered material. The sintered material is cooled to form cement clinker. The production of the sintered material is controlled by measuring the sulfur content in the cement clinker and using that measurement to control the concentration of oxygen at the inlet of the kiln. The fuel may contain up to 14% sulfur.
    Type: Grant
    Filed: March 16, 1999
    Date of Patent: April 18, 2000
    Assignee: Cement Petcoptimizer Company
    Inventor: Joseph Doumet
  • Patent number: 5882190
    Abstract: Cement clinker is produced using high sulfur fuels by combusting high sulfur fuel within a kiln. The feed material is introduced at an inlet of the kiln and is sintered by the combusting fuel to form sintered material. The sintered material is cooled to form cement clinker. The production of the sintered material is controlled by measuring the sulfur content in the cement clinker and using that measurement to control the concentration of oxygen at the inlet of the kiln.
    Type: Grant
    Filed: December 2, 1997
    Date of Patent: March 16, 1999
    Inventor: Joseph Elias Doumet
  • Patent number: 5413635
    Abstract: Disclosed is a method and an apparatus for the heat treatment of lime sludge (CaCO.sub.3) to form burnt lime (CaO). In the method of the present invention a lime sludge feed is entrained in and thereafter dried in a gas flash dryer means to produce a dried lime sludge. The dried lime sludge is separated from the gases and thereafter is fed to a rotary kiln in which the dried lime sludge is converted to active burnt lime. In order to maintain the flow of gas in the flash dryer means at a predetermined velocity in order to entrain all the lime sludge feed in the gas flow, an adjustable portion of the separated gases are recycled through the flash dryer means.
    Type: Grant
    Filed: December 30, 1993
    Date of Patent: May 9, 1995
    Assignee: Fuller Company
    Inventors: David M. Matweecha, Charles R. Euston
  • Patent number: 5336317
    Abstract: A process for producing cement, including preheating a mixture of ground raw materials (raw meal) in a preheating cyclone to form a preheated raw meal, calcining the preheated raw meal in a calciner to form a calcined raw meal, burning the calcined raw meal in a rotary kiln with the aid of a high-grade fuel to form a cement clinker, cooling the cement clinker in a rotary kiln and grinding the cooled cement clinker. The process is characterized by replacing 50 to 70% of the high-grade fuel with a low-grade fuel, gasifying the low-grade fuel in a fluidized bed to form a resulting fuel gas, supplying a first portion of the resulting fuel gas to a main burner of the rotary kiln, a second portion of the resulting fuel gas to the exhaust gas stream from the rotary kiln and a third portion of the resulting fuel gas to the calciner.
    Type: Grant
    Filed: March 11, 1993
    Date of Patent: August 9, 1994
    Assignee: Metallgesellschaft AG
    Inventors: Hans Beisswenger, Jochim Eschenburg, Johannes Loffler
  • Patent number: 5164008
    Abstract: A composition, suitable for use as a base in the construction of roads, parking lots, and other areas, is formulated from an ash aggregate comprising municipal solid waste incinerator ash, MSWIA, mixed with an aggregate material; upon addition of cement, compaction and curing, a volumetrically stable solid is formed. The incinerator ash is combined with an aggregate material, crushed, and sifted to remove particles having a size greater than three eights (3/8") inch prior to the addition of cement. The moisture content of the ash aggregate mixture and ash aggregate/cement mixtures are carefully adjusted to achieve maximum compressive strength. When ash aggregates containing less than 50 percent MSWIA are combined with at least 5 percent cement by dry weight, volumetrically stable solids are formed within seven days that have compressive strengths in excess of 300 psi.
    Type: Grant
    Filed: January 16, 1991
    Date of Patent: November 17, 1992
    Assignee: Permabase, Inc.
    Inventors: William W. Casey, Clarence E. Leisey, III, Eric W. Shafer, Francis I. Daniels
  • Patent number: 5156676
    Abstract: Methods are disclosed for the use of inexpensive volatile fuels in the calcining zone of a cement kiln during the manufacture of cement clinker in a rotary vessel.
    Type: Grant
    Filed: May 7, 1991
    Date of Patent: October 20, 1992
    Assignees: Hoke M. Garrett, Ash Grove Cement Company, Cadence Chemical Resources, Inc.
    Inventors: Hoke M. Garrett, Eric Hansen
  • Patent number: 5141526
    Abstract: Waste sludge that contains water, solids and oil, is mixed with a filter aid that has filter aid characteristics and a heating value of at least 1,000 Btu/lb. The admixture obtained is subjected to filtration yielding a high-Btu combustible material, useful as fuel. This combustible material, optionally after drying to remove water, is very suitable for use as fuel in a cement kiln.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: August 25, 1992
    Assignee: Shell Oil Company
    Inventor: Humbert H. Chu
  • Patent number: 5122190
    Abstract: A method for producing a hydraulic binder using partially calcined raw meal entrained in the kiln off gases. The raw meal flow form the lowermost cyclone is interrupted at or near the junction of the meal chute, kiln inlet and riser duct. This flow interruption causes turbulence in the partially calcined meal facilitating dust entrainment in the gas. The splash plate can be selectively adjusted to entrain more or less raw meal. The entrained meal is drawn off from the riser duct through a kiln bypass duct, processed and hydrated to convert the calcium oxide in the meal to calcium hydroxide.
    Type: Grant
    Filed: July 13, 1990
    Date of Patent: June 16, 1992
    Assignee: Southdown, Inc.
    Inventors: Michael von Seebach, J. Bruce Tompkins
  • Patent number: 5122189
    Abstract: Methods are disclosed for the use of inexpensive volatile fuels in the calcining zone of a cement kiln during the manufacture of cement clinker in a rotary vessel.
    Type: Grant
    Filed: April 13, 1990
    Date of Patent: June 16, 1992
    Assignees: Hoke M. Garrett, Ash Grove Cement Company, Cadence Chemical Resources, Inc.
    Inventors: Hoke M. Garrett, Eric Hansen