Carbonaceous Patents (Class 75/460)
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Patent number: 12247265Abstract: Solid agglomerated product, usable as a charge material for an electric arc furnace, comprises at least one fraction of by-product deriving from a steel plant and which comprises a first part containing ferrous oxide FeO and a second part containing ferric oxide Fe2O3, a fraction of solid fuel (CR) containing a quantity of carbon and at least one inorganic binder to agglomerate a fraction of by-product and the fraction of solid fuel with each other and give the agglomerated product the required mechanical properties. The inorganic binder at least partly comprises slag.Type: GrantFiled: September 25, 2019Date of Patent: March 11, 2025Assignee: DANIELI & C. OFFICINE MECCANICHE S.P.A.Inventors: Selena Tiburzio, Liliana Florina Arsene, Luca Tommasi, Alessandra Primavera
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Patent number: 9624558Abstract: A method for producing blast-furnace blowing coal to be blown through a tuyere into the interior of the blast-furnace body of a blast furnace, wherein: the composition and melting point of the ash from the coal are analyzed in advance; the composition of the blast-furnace slag is analyzed in advance; the blast-furnace slag contains more calcium oxide than the coal ash does; and the coal and the blast-furnace slag are mixed, on the basis of the composition and melting point of the coal ash and the composition of the blast-furnace slag, and in a manner such that the amount of calcium oxide contained in a quaternary system phase diagram including silicon dioxide, magnesium oxide, aluminum oxide and calcium oxide, which are the principal components of the coal ash and the blast-furnace slag, causes the melting point of the ash to be 1400° C. or higher.Type: GrantFiled: April 25, 2013Date of Patent: April 18, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Setsuo Omoto, Keiichi Nakagawa, Tsutomu Hamada, Masakazu Sakaguchi
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Patent number: 9617609Abstract: On the basis of data obtained by means of analyzing coal, a first and second coal type satisfying conditions are selected, the ash melting point of the mixed coal resulting from mixing the first and second coal types is derived on the basis of a four-dimensional state diagram for SiO2—CaO—MgO-20% Al2O3, on the basis of the ash melting point of the mixed coal and the four-dimensional state diagram, an additive causing the ash melting point of the mixed coal to be at least 1400° C. at the lowest quantity when added to the mixed coal is selected from SiO2, MgO, and CaO, the addition quantity of the additive is derived, the first coal type and second coal type are mixed to result in the mixed coal, and the addition quantity of the additive is added to the mixed coal.Type: GrantFiled: September 19, 2013Date of Patent: April 11, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Keiichi Nakagawa, Setsuo Omoto, Masakazu Sakaguchi, Tsutomu Hamada
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Patent number: 9605225Abstract: Provided is a method for preparing blast furnace blow-in coal that can, at a low cost, obtain blast furnace blow-in coal that suppresses occlusion by blast furnace blow-in ash or accretion of blast furnace blow-in ash in a pathway leading to a tuyere of a blast furnace main body, while suppressing a decrease in the amount of heat release. The method includes selecting first and second coal types satisfying conditions (S2, S3), on the basis of the CaO content in the ash when the oxides of Al, Si, Ca, and Mg in the ash is 100 wt % and the Al2O3 content in the ash is 20 wt %, deriving the mixing ratio of the first and second coal types that results in the CaO content in the ash of the mixed coal being at least 40 wt % (S4), and mixing the first and second coal types (S5) at the mixing ratio.Type: GrantFiled: September 13, 2013Date of Patent: March 28, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Keiichi Nakagawa, Setsuo Omoto, Masakazu Sakaguchi, Tsutomu Hamada
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Patent number: 9267087Abstract: The invention provides methods of operating thermal equipment, for example, gas turbines and methods for protecting hot parts of thermal equipment from, for example, corrosion by ash from an alkali metal or from lead; fouling by ash of an alkaline-earth metal, lead or a transition metal; and the combined effects of an alkali metal, lead, an alkaline-earth metal or a transition metal.Type: GrantFiled: August 31, 2010Date of Patent: February 23, 2016Assignee: GE Energy Products France SNCInventors: Michel Moliere, Jean-Yves Regnier
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Patent number: 9222038Abstract: A plasma gasification reactor vessel having a top section with a conical wall extending up from a bottom section, containing a carbonaceous bed into which plasma is injected by plasma torches, to a roof of the vessel is arranged in ways that can contribute to characteristics of gas flow and solids residence time that are favorable for thoroughness of reactions and yield of useful reactions products. In some cases, such a conical wall is combined in arrangements with other features such as one or more feed ports arranged to give more uniform distribution including examples with a feed port that has a distributive feed mechanism. The roof of the vessel, in some examples, has vertical outlet ports that include intrusions into the interior volume of the reactor proximate the conical wall of the top section. The configurations of outlet ports with intrusions and the configurations of feed ports for more uniform distribution of feed material are also applicable to reactor vessels with other geometries.Type: GrantFiled: February 11, 2009Date of Patent: December 29, 2015Assignee: Alter NRG Corp.Inventors: Shyam V. Dighe, Mark F. Darr, Ivan A. Martorell, Pieter van Nierop, Aleksandr Gorodetsky, Richard Dale Bower
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Patent number: 8992663Abstract: The invention relates to a method for simultaneously producing iron and a crude syngas containing CO and H2 by means of a blast furnace that is charged with iron ore and carbon-containing reducing agents. The amount of carbon-containing reducing agents fed to the blast furnace is greater than the amount of fuel required for producing the iron. Technically pure oxygen is fed into the blast furnace for the blast furnace process and for producing the crude syngas. In addition, CO2 and/or steam are fed to the blast furnace in order to control the ratio between CO and H2 in the crude syngas discharged from the blast furnace as top gas and/or moderate the temperature at which the oxygen is injected.Type: GrantFiled: May 5, 2010Date of Patent: March 31, 2015Assignee: ThyssenKrupp Uhde GmbHInventor: Johannes Menzel
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Patent number: 8945274Abstract: A coke layer and an ore layer are formed in a blast furnace. The coke layer is formed of conventional coke and the ore layer is formed of carbon iron composite, conventional coke, and ore. The mixing percentage of the conventional coke in the ore layer with respect to the ore is 0.5 mass % or more. Slowing of the gasification reaction of carbon iron composite in the cohesive zone can be suppressed.Type: GrantFiled: August 10, 2010Date of Patent: February 3, 2015Assignee: JFE Steel CorporationInventors: Takeshi Sato, Taihei Nouchi, Hidekazu Fujimoto, Takashi Anyashiki, Hideaki Sato
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Publication number: 20120079917Abstract: The invention relates to a method for simultaneously producing iron and a crude syngas containing CO and H2 by means of a blast furnace that is charged with iron ore and carbon-containing reducing agents. The amount of carbon-containing reducing agents fed to the blast furnace is greater than the amount of fuel required for producing the iron. Technically pure oxygen is fed into the blast furnace for the blast furnace process and for producing the crude syngas. In addition, CO2 and/or steam are fed to the blast furnace in order to control the ratio between CO and H2 in the crude syngas discharged from the blast furnace as top gas and/or moderate the temperature at which the oxygen is injected.Type: ApplicationFiled: May 5, 2010Publication date: April 5, 2012Applicant: THYSSENKRUPP UHDE GMBHInventor: Johannes Menzel
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Patent number: 8133298Abstract: An integrated system for blast furnace iron making and power production based upon higher levels of oxygen enrichment in the blast gas is disclosed. The integrated system leads to; 1) enhanced productivity in the blast furnace, 2) more efficient power production, and 3) the potential to more economically capture and sequester carbon dioxide. Oxygen enhances the ability of coal to function as a source of carbon and to be gasified within the blast furnace thereby generating an improved fuel-containing top gas.Type: GrantFiled: December 5, 2008Date of Patent: March 13, 2012Assignee: Air Products and Chemicals, Inc.Inventors: Michael Dennis Lanyi, Joseph Anthony Terrible
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Patent number: 7879133Abstract: A method has steps of providing a three-dimensional (3-D) laser scanner, providing a computer, obtaining point group data (PGD) and calculating measuring an outline of a top reactant stratum from the PGD. The step of providing a 3-D laser scanner directs a 3-D laser scanner at reactant strata in a blast furnace and output PGD that represent digital data of an inside of the blast furnace. The step of providing a computer connects the 3-D laser scanner to a computer having a point group analysis program. The step of calculating an outline of the top reactant stratum from the PGD is performed by the point group analysis program to calculate an outline of the top reactant stratum in the blast furnace from the PGD. At least one two-dimensional laser scanner is used to measure a path of the reactant being charged.Type: GrantFiled: May 25, 2007Date of Patent: February 1, 2011Assignee: China Steel CorporationInventors: Shih-Kang Kuo, Wen-Chieh Li, Shan-Wen Du
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Publication number: 20110000339Abstract: A method of producing steel (1) with a high manganese and low carbon content on the basis of liquid pig iron (2) or liquid steel (3) and slag-forming constituents (4) with the object of preventing existing drawbacks of process route in vessels other than, e.g., electrical arc furnaces (18). With steel produced with a high manganese and low carbon content, in a process, the carbon component is reduced to about 0.7-0.8% by a combined blowing of oxygen (7) through top lances (8) and underbath nozzles (9) after feeding of liquid ferro-manganese (50 and liquid steel (3a) in a FeMn-refining converter (6a), wherein a component of a cold end product from premelt is added as cooling means (10), and wherein the carbon component is reduced to about 0.05-0.1% C by a continuous blowing of oxygen (7) through the underbath nozzles.Type: ApplicationFiled: June 25, 2010Publication date: January 6, 2011Inventors: Lutz Rose, Walter Weischedel
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Publication number: 20100146982Abstract: An integrated system for blast furnace iron making and power production based upon higher levels of oxygen enrichment in the blast gas is disclosed. The integrated system leads to; 1) enhanced productivity in the blast furnace, 2) more efficient power production, and 3) the potential to more economically capture and sequester carbon dioxide. Oxygen enhances the ability of coal to function as a source of iron reductant and to be gasified within the blast furnace thereby generating an improved fuel-containing top gas.Type: ApplicationFiled: December 3, 2009Publication date: June 17, 2010Applicant: AIR PRODUCTS AND CHEMICALS, INC.Inventors: Michael Dennis Lanyi, Joseph Anthony Terrible, Maarten Geerdes, Roman Vaynshteyn
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Publication number: 20100037729Abstract: A carbonaceous material substitute product for blast furnace metallurgical coal and method of making the carbonaceous material is disclosed. A metallurgical coal substitute material is made from non-metallurgical grade coal or other carbon sources.Type: ApplicationFiled: April 29, 2009Publication date: February 18, 2010Inventors: Siddhartha Gaur, Vibha Bansal
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Publication number: 20100011908Abstract: A process for direct smelting metalliferous feed material in a direct smelting vessel and producing process outputs of molten metal, molten slag, and an off-gas from the vessel is disclosed. The process includes controlling pressure in the direct smelting vessel by controlling off-gas pressure in an off-gas stream supplied to a fluidised bed pretreatment apparatus while the process is operating in the “hold” and “idle” process states.Type: ApplicationFiled: April 24, 2007Publication date: January 21, 2010Inventor: John Neil Goodman
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Patent number: 6835229Abstract: A system for monitoring coal flow through a coal delivery tube in a blast furnace fuel injection system is disclosed, which system automatically actuates a purge cycle for clearing accumulations of coal from a coal lance when a temperature drop indicative of an imminent blockage is detected. A method of controlling the purge system is also disclosed.Type: GrantFiled: January 22, 2002Date of Patent: December 28, 2004Assignee: ISG Technologies Inc.Inventors: Robert K. Brown, Mark J. Zolenas
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Publication number: 20040025633Abstract: A nonfired agglomerated ore which is satisfactory in reduction property in the shaft of a blast furnace and excellent in rapid heating bursting property and a production method thereof are provided. A carbon containing nonfired agglomerated ore for blast furnace which is prepared in such a way that iron oxide and a carbonaceous material are blended with each other to prepare a mixture, a binder is added to the mixture, and the mixture is kneaded, formed, and cured, wherein the agglomerated ore contains carbon in the content of 80 to 120% of the theoretical carbon quantity required to reduce the reducible oxygen in the iron ores to form metallic iron, and the binder is selected so that the crushing strength may be 7,850 kN/m2 or more at room temperature.Type: ApplicationFiled: May 28, 2003Publication date: February 12, 2004Applicants: Tetsugen Corporation, Nippon Steel CorporationInventors: Hideo Kanoshima, Seita Uekawa, Koji Morimoto, Shinichi Matsunaga, Masaaki Naito
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Publication number: 20020178864Abstract: A method for making surface-coated reduced iron includes the step of coating the surface of reduced iron with a tar emulsion. Preferably, the tar emulsion includes at least one hydrocarbon-based material selected from the group consisting of natural petroleum tar, coal tar, pitch, asphalt, liquefied coal, and residual oil from petroleum refining; a surfactant; and water. More preferably, the tar emulsion contains 60 to 80 percent by mass of the hydrocarbon-based material, 0.1 to 1 percent by mass of the surfactant, and the balance being substantially water.Type: ApplicationFiled: June 4, 2002Publication date: December 5, 2002Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Naoto Watanabe, Masahiro Shimizu
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Patent number: 6478846Abstract: The invention relates to a method for injecting reducing agents into a shaft furnace in which the reducing agent is transported within a pneumatic delivery stream to the shaft furnace according to the flowing steps; a) dividing the delivery stream into a number of partial streams, b) transferring the individual partial streams through a heating unit, and c) heating the reducing agent within the individual partial streams inside of the heating device. A device for carrying out the inventive method comprises, for example, a delivery line in order to pneumatically deliver the reducing agent to the shaft furnace, and a number of heat exchange pipes which are integrated in the delivery line using a parallel connection, said connection relating to flow techniques, such that the pneumatic delivery stream is divided into a number of partial streams. The inventive device also comprises a heating unit for transmitting heat energy to the individual partial streams.Type: GrantFiled: May 11, 2000Date of Patent: November 12, 2002Assignees: Thyssen Krupp Stahl AG, Kuettner GmbH & Co. KGInventors: Louis Schmit, Raymond Mack, Karl Langner, Klaus Schott
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Patent number: 6280498Abstract: A synthetic resin fuel for stable production of pig iron in a blast furnace. It is in the form of cylindrical pellets, each measuring X mm in thickness and Y mm in diameter, with X and Y satisfying the three expressions of 3.0≦X≦10, 2≦Y≦20, and Y/X≧1.5. The cylindrical pellets are produced by melting a resin, solidifying the melt, and cutting the solidified product. The cylindrical pellets should preferably contain more than 0.05 wt % of water. A process for producing pig iron in a blast furnace by blowing a synthetic resin fuel into a blast furnace through tuyeres, wherein said synthetic resin fuel is in the form of cylindrical pellets, each measuring X mm in thickness and Y mm in diameter, with X and Y satisfying the above-mentioned three expressions. The cylindrical pellets should preferably have a size distribution such that those having a diameter within ±20 % of the average diameter account for more than 70 wt %.Type: GrantFiled: August 31, 2000Date of Patent: August 28, 2001Assignee: Kobe Steel, Ltd.Inventors: Kentaro Nozawa, Yasuo Yoshida
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Patent number: 6264723Abstract: A method and a plant for manufacturing steel in an electric steel furnace wherein the electric steel furnace is charged with at most 70% scrap and with at most 60% liquid pig iron obtained in a mini-blast furnace, and optionally with additional iron carriers, and wherein the mini-blast furnace is operated for producing the pig iron with iron pellets and/or coarse or lump ore and coke as well as coal. The melting process in the electric steel furnace is operated using electrical energy and by simultaneously using oxygen and injected coal. The plant for carrying out the method is composed of a mini-blast furnace and an electric steel furnace.Type: GrantFiled: June 4, 1999Date of Patent: July 24, 2001Assignee: SMS Schloemann-Siemag AktiengesellschaftInventor: Fritz-Peter Pleschiutschnigg
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Patent number: 6231638Abstract: The invention concerns a process for producing metal from metal ores, in particular crude or pig iron from iron ore, wherein the ore which contains metal oxides is brought into contact with a reducing gas which contains carbon and/or hydrogen from solid, carbon-bearing and/or hydrocarbon-bearing substances obtained at least partially from plastic waste. According to the invention, the carbon-bearing and/or hydrocarbon-bearing substances are injected in comminuted fluidized form as an agglomerate into the air flow in the hearth of the metallurgical shaft or pit furnace, in particular a blast furnace. The apparatus includes a first shut-off device that is closed when blockages of the plastic material occur in the transport conduit or the lance, a second shut-off device that is closed when hot air penetrates into the transport conduit and/or the lance by reverse flow, and a third shut-off device that is closed when compressed air is supplied to a lance for cooling.Type: GrantFiled: February 8, 1999Date of Patent: May 15, 2001Assignee: Der Grune Punkt - DSD Duales System Deutschland AGInventors: Joachim Janz, Manfred Voss
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Patent number: 6206949Abstract: A method for reducing the NOx content of combustion gases from combustion in a commercial furnace wherein hot oxygen and carbonaceous fuel such as pulverized coal react to form a fuel-rich gas phase mixture which is then used to reduce NOx to nitrogen gas.Type: GrantFiled: May 19, 2000Date of Patent: March 27, 2001Assignee: Praxair Technology, Inc.Inventors: Hisashi Kobayashi, Lawrence E. Bool, III, Michael Francis Riley
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Patent number: 6090182Abstract: A method for providing a blast stream into a blast furnace wherein fuel and hot oxygen are provided into the blast air, the hot oxygen being at a temperature and velocity each greater than that of the blast air, and wherein the fuel and hot oxygen begin to combust prior to passage into the blast furnace in the blast stream.Type: GrantFiled: October 29, 1997Date of Patent: July 18, 2000Assignee: Praxair Technology, Inc.Inventor: Michael Francis Riley
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Patent number: 5772727Abstract: A process of producing metal from a metal ore containing metal oxides includes the steps of: obtaining a reducing gas containing at least one of carbon and hydrogen from solid substances containing at least one of carbon and hydrocarbons; bringing the ore into reaction contact with the reducing gas in a metallurgical blast furnace; and injecting a comminuted, fluidized plastics material into a blast current in a hearth region of the blast furnace, the plastics material comprising an agglomerate including plastics particles having a particle size substantially between 1 mm and 10 mm.Type: GrantFiled: August 18, 1995Date of Patent: June 30, 1998Assignee: Stahlwerke Bremen GmbHInventors: Hans De Haas, Joachim Janz, Horstmar Mohnkern, Manfred Voss
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Patent number: 5522916Abstract: A high-speed jet of liquid oxygen (21) with a speed higher than 100 meters per second is delivered into the tuyeres of a blast furnace of cupola furnace together with pulverised carbon. The jet reaches the opposite wall of the cavity (9) formed at the outlet of the tuyere (6) in the mass of material contained in the shaft. Supplying oxygen to the bottom of the cavity improves the burning of the remaining coal, whereby higher injection levels may be achieved. The shape of the cavity may also be altered, and, in particular, faster reactions may be achieved in the axial region of the shaft.Type: GrantFiled: October 31, 1994Date of Patent: June 4, 1996Assignee: L'Air Liquids, Societe Anonyme pour L'Etude et L'Exploitation des Procedes Georges ClaudeInventors: Pierre Karinthi, Marc Buffenoir, Eric Streicher
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Patent number: 5516356Abstract: A process for feeding a second stream of pulverulent materials into a pneumatic conveying line carrying a first controllable flow of pulverulent materials is presented. The second stream of pulverulent materials is fed at a controlled rate and the control of the first flow is rendered insensitive to disturbances caused by the feeding of the second stream by directly or indirectly controlling the first flow upstream of the injection point of the second stream.Type: GrantFiled: October 25, 1994Date of Patent: May 14, 1996Assignees: Paul Wurth S.A., Sidmar N.V.Inventors: Louis Schmit, Heli DeLanghe
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Patent number: 5451034Abstract: A method and device is provided for the combined injection of pulverized coal and a gaseous oxidant into a crucible of a shaft furnace, especially a blast furnace, through a hot-air blast tuyere. In the region of the nozzle end of the tuyere in the crucible, the pulverized coal is injected into the hot-air blast, in the form of a hollow annular jet and the gaseous oxidant is injected inside the hollow annular jet. A lance for implementing the method comprises two coaxial tubes and a distributing unit provided with a central bore for the pulverized coal.Type: GrantFiled: June 30, 1993Date of Patent: September 19, 1995Assignee: Paul Wurth S.A.Inventors: Leon Ulveling, Yvon Kroemmer, Charles Schmit
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Patent number: 5403378Abstract: To prevent burn-back at a coal dust injection lance which projects into a hot blast conduit of a blast furnace, cooling is effected using atomized coolant. Water is preferred as the coolant. The carrier gas used for the atomized water is either air or the oxygen which is injected through the lance for complete combustion of the coal dust.Type: GrantFiled: June 29, 1993Date of Patent: April 4, 1995Assignee: Kortec AGInventors: William Wells, Ralph Weber
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Patent number: 5350439Abstract: A first flow of gas (C) accompanying a flow of solid particles (S), is sent at supersonic speed into a first conduit (1) prolonged by a third conduit (8) and intersecting a second conduit (6) supplying a second flow of gas (G) which is deflected into the third conduit (8) to accompany the flow of particles (S) whose trajectory is not substantially modified, the flow of the first gas (C) being deflected, downstream of an oblique shockwave (13) into a fourth conduit (9) forming a separator nose (10) with the third conduit (8). The invention is particularly applicable to the injection, into a reaction chamber (16), of solid particles with a highly oxygenated gas (G) replacing an inert gas (C) for conveying the particles.Type: GrantFiled: July 26, 1993Date of Patent: September 27, 1994Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges ClaudeInventor: Jean Ducrocq
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Patent number: 5333840Abstract: Fuel and combustion gas are supplied to the blast pipes and tuyeres of a blast furnace through injection lances which have an inner tube and an outer tube. The inner tube is generally used to carry the fuel, while the space formed between the inner and outer tubes is used to carry the combustion gas. Such a lance can have a heat resistant tip which has a bore for forming an extension of the inner fuel supply tube, and which also has a number of helical channels disposed about the bore for forming an extension of the space between the tubes. It is advantageous to have more than one such lance in each blast pipe and to have the lances extend obliquely into the hot blast channel that is formed by the blast pipe and the tuyere.Type: GrantFiled: July 14, 1993Date of Patent: August 2, 1994Assignee: SSAB Tunnpl.ang.t ABInventors: Bror E. Skold, Nils O. Lindfors, Jan O. Wikstrom
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Patent number: 5123632Abstract: The method consists in forming in a single metering device a pneumatic mixture comprising the powdered substances and the propellent gas, in propelling this mixture through a common main 18 into a distributor 20 in which the mixture is split into secondary currents which are sent to each of the injection points respectively through secondary pipes 22.sub.1, 22.sub.2, . . . 22.sub.n, in determining the flow rate in each of the secondary pipes 22.sub.1, 22.sub.2, . . . 22.sub.n by the tuyere 28.sub.1, 28.sub.2, . . . 28.sub.n flow cross-sections and in influencing the transport conditions in each secondary pipe 22.sub.1, 22.sub.2, . . . 22.sub.n by acting on the pressure P3 downstream from each tuyere 28.sub.1, 28.sub.2, . . . 28.sub.n in order to maintain this pressure at a determined value.The method is aimed more particularly at the injection of powdered coal into a blast furnace.Type: GrantFiled: March 7, 1990Date of Patent: June 23, 1992Assignee: Paul Wurth S.A.Inventors: Louis Schmit, Yvon Kroemmer, Leon Ulveling
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Patent number: 4985075Abstract: A method for manufacturing a chromium-bearing pig iron comprises the steps of charging cold bond pellets, iron ore and coke lumps into a blast furnace from above and blowing a gas containing more than 50% oxygen therein and tuyere nose flame temperature control agent into the blast furnace through the tuyere, the cold bond pellets being comprised of powdered chromium ore and powdered coke as principal feed materials. The cold bond pellets are manufactured by performing a mixing, a pelletizing and a curing step. The tuyere nose flame temperature control agent is a top gas, steam, water or CO.sub.2, which is used to control the flame temperature to 2000.degree. to 2900.degree. C.Type: GrantFiled: January 12, 1989Date of Patent: January 15, 1991Assignee: Nippon Kokan Kabushiki KaishaInventors: Yotaro Ohno, Masahiro Matsuura, Kenkichi Sato, Hiroshi Fukuyo
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Patent number: 4921532Abstract: A method of ironmaking by means of a smelting shaft furnace including the steps of supplying iron ore and coke to the top of the furnace; and injecting coal and oxygen into the smelting zone of the furnace to promote combustion, to control reaction temperature and provide heat for smelting, the quantities of coal and oxygen injection being within the range of 0.7 to 1.7 of stoichiometric conditions with respect to combustion to carbon monoxide and hydrogen.Type: GrantFiled: May 12, 1989Date of Patent: May 1, 1990Assignee: British Steel CorporationInventors: Martin J. Corbett, Richard B. Smith
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Patent number: 4917727Abstract: According to a method of operating a blast furnace, pure oxygen, pulverized coal, and a temperature control gas which substantially does not contain nitrogen are blown from tuyeres. A preheating gas which substantially does not contain nitrogen is blown from an intermediate shaft level. A blast furnace gas which substantially does not contain nitrogen can be produced from a furnace top.Type: GrantFiled: November 22, 1988Date of Patent: April 17, 1990Assignee: Nippon Kokan Kabushiki KaishaInventors: Hiroshi Saito, Yotaro Oono, Hirohisa Hotta, Masahiro Matsuura