Recycled Off Gas Patents (Class 75/464)
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Patent number: 11208706Abstract: The present invention discloses a system and method for using a pressurized oxy-fired configuration to conduct metal reduction. The invention discloses a process for production of metal from metal oxide ore through reduction, comprising: (a) feeding a mixture of metal oxide ore, fuel and supply of oxygen into the inlet of a metallization reactor, (b) heating the mixture of metal oxide ore, oxygen and fuel in a primary reduction zone of the metallization reactor at a pressure exceeding ambient pressure to produce a product mixture; and (c) separating the product mixture in a gas separation unit at the bottom or downstream of the metallization reactor.Type: GrantFiled: April 26, 2017Date of Patent: December 28, 2021Assignee: HER MAJESTY THE QUEEN IN RIGHT OF CANADA AS REPRESENTED BY THE MINISTER OF NATURAL RESOURCESInventors: Bruce Clements, Mohammad Sameer Asiri, Marc Alexander Duchesne, Robin William Hughes
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Patent number: 10337076Abstract: A method for reducing metal oxide containing charge materials (1): reducing the metal oxide containing charge materials (1) in at least two fluidized bed units (RA,RE) by means of a reduction gas (2), wherein at least some of the resulting off-gas (3) is recycled and wherein the metal oxide containing charge materials (1) are conveyed into the fluidized bed unit RE by a propellant gas. Also, apparatus for carrying out the method according to the invention is disclosed.Type: GrantFiled: January 27, 2015Date of Patent: July 2, 2019Assignee: PRIMETALS TECHNOLOGIES AUSTRIA GMBHInventors: Robert Millner, Jan-Friedemann Plaul, Norbert Rein
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Patent number: 9151492Abstract: An apparatus for heating a blast furnace stove having a combustion region and a combustion gas outlet associated with the combustion region includes a source of lower calorific value fuel; a first pipeline for supplying the lower calorific value fuel to the combustion region; a source of air; a second pipeline for supplying the air to the combustion region; a source of oxidant comprising at least 85% by volume of oxygen; a third pipeline to supply the oxidant to the combustion region; a fourth pipeline communicating with the combustion gas outlet for conducting combustion gas away from the stove; and a fifth pipeline operable to recirculate combustion gas to the combustion region. The apparatus may operate in different modes according to which of the pipelines are placed in communication with the combustion region.Type: GrantFiled: May 25, 2011Date of Patent: October 6, 2015Assignee: Linde AktiengesellschaftInventors: Andrew M. Cameron, Kelly T. Visconti
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Patent number: 8992664Abstract: A process for recycling blast furnace gas is provided. At least one portion of the gases resulting from the blast furnace undergo a CO2 purification step to create a CO-rich gas which is reinjected at a first top injection point at a temperature between 700° C. and 1000° C. through a top injection line, and at a second bottom injection point at a temperature between 1000° C. and 1300° C. through a bottom injection line. The gases from the bottom and top injection lines are heated at a temperature between 1000° C. and 1300° C. A portion of the CO-rich gas exiting the purification step is directly introduced into the top injection line via a cold gas injection line to obtain a temperature between 700° C. and 1000° C. at the first top injection point. The gas that flows through the bottom and top injection points controlled upstream of the system of the heaters. A device is also provided.Type: GrantFiled: March 17, 2009Date of Patent: March 31, 2015Assignee: Arcelormittal Investigación y Desarrollo, S.L.Inventors: Fernand Didelon, Yves Rachenne, Christian Gillion, Jean Borlee, Dominique Sert
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Patent number: 8545597Abstract: A method for operating a blast furnace and a corresponding blast furnace, the method including recovering top gas from the blast furnace, submitting at least a portion of the top gas to a recycling process, and feeding the recycled top gas back into the blast furnace, where the recycling process includes feeding the recovered top gas to a reformer unit, feeding volatile carbon containing material to the reformer unit, proceeding to flash gasification of the volatile carbon containing material in the reformer unit, at a temperature between 1100 and 1300° C., and thereby producing devolatized carbonaceous material and synthesis gas, and allowing the devolatized carbonaceous material and synthesis gas to react with the recovered top gas.Type: GrantFiled: October 30, 2009Date of Patent: October 1, 2013Assignee: Paul Wurth S.A.Inventors: Jean-Luc Roth, Jean-Paul Simoes
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Patent number: 8287620Abstract: A method for the melting of pig iron in a blast furnace (1) operated with oxygen or in a melt-reduction plant, with a reduction region. Purified crude gas is discharged from the reduction region and is recirculated into the reduction region with the addition of hydrocarbons. The purified crude gas is mixed with hydrocarbons and is also blended with a reduction gas which has a temperature of above 1000° C. and which is generated by partial oxidation of hydrocarbons by means of oxygen gas having an oxygen content of above 90% by volume, in order to form a recirculation gas with a temperature of above 800° C. The recirculation gas is recirculated into the reduction region according to an auto-reforming process.Type: GrantFiled: January 29, 2009Date of Patent: October 16, 2012Assignee: Siemens Vai Metals Technologies GmbHInventors: Robert Millner, Kurt Wieder, Johann Wurm
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Patent number: 8142542Abstract: Offgas containing carbon dioxide and carbon monoxide that is produced in the reduction of ores and other metal oxides in a reactor is treated to reduce its carbon dioxide content and is then contacted with metal oxide to reduce the oxidation state of the metal and oxidize carbon monoxide therein to carbon dioxide, following which the reduced metal is oxidized with steam to produce hydrogen that can be fed to the reactor.Type: GrantFiled: September 22, 2011Date of Patent: March 27, 2012Assignee: Praxair Technology, Inc.Inventors: Raymond Francis Drnevich, Joseph Michael Schwartz, Minish Mahendra Shah, Dante Patrick Bonaquist
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Publication number: 20040216560Abstract: The invention relates to a process for producing pig iron or liquid primary steel products in a blast furnace, CO2 being substantially removed from at least a partial stream of a top gas emerging from a reduction shaft furnace (1), and this partial stream if appropriate being heated and being introduced into the blast furnace as reduction gas, and to a plant for carrying out this process, the top gas being introduced into the lower region of the blast-furnace shaft. This measure results in an improved energy balance and improved process management compared to the prior art.Type: ApplicationFiled: November 14, 2002Publication date: November 4, 2004Inventors: Leopold Werner Kepplinger, Herbert Mizelli, Johann Wurm
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Patent number: 5259594Abstract: A process for recycling hot dust from a gasifier or melt-down gasifier by means of a hot gas cyclone separator integrated into a pipe system is described, together with the associated apparatus. The hot dust from the hot gas cyclone separator is supplied by means of a lock system to a burner in order to overcome the pressure difference between the hot gas cyclone separator and the melt-down gasifier. By means of the lock system the dust is supplied from a lower pressure zone to a higher pressure zone. The dust to be recycled comprises coke or a mixture of coke and iron particles.Type: GrantFiled: December 27, 1991Date of Patent: November 9, 1993Assignee: Deutsche Voest-AlpineInventors: Herbert Mayr, Rolf Hauk, Rodgan Vuletic, Werner Kepplinger
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Patent number: 5234490Abstract: Method of producing pig iron in a blast furnace. At least a portion of a top gas from a blast furnace is collected, dried and then heated to an elevated temperature preferably in the range of 900.degree.-1000.degree. C. An oxygen-enriched hydrogenaceous fuel is introduced into the furnace bosh and the heated dried top gas is introduced into the lower half of the furnace stack above the furnace bosh at a point above which the coke in the furnace is not reactive.Type: GrantFiled: November 29, 1991Date of Patent: August 10, 1993Assignee: Armco Inc.Inventor: David M. Kundrat