• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method of producing a hot, carburized metallized iron product in a generally vertical shaft furnace having an upper reducing zone in which iron oxide reacts with a gaseous reductant, and a lower carbon control and product discharge zone, including: establishing a gravitationally descending iron oxide burden in the furnace; reacting hot gaseous reductant with the descending burden to form a metallized iron product and a reacted top gas; and injecting a hydrocarbon gas mixture consisting of hot reformed endothermic gas and cool natural gas to the product discharge section of the shaft furnace; whereby the carbon content of the metallized iron pellet product is controlled by mixing the endothermic gas and natural gas in the proper ratio to balance the endothermic and exothermic reactions within the discharge zone of the furnace. Apparatus for carrying out the method includes means for controlling the respective amounts of gas introduced to the product discharge zone from the endothermic gas reformer and the source of natural gas.
    公开号:SU1674693A3
    申请号:SU874202226
    申请日:1987-03-20
    公开日:1991-08-30
    发明作者:Макс Лав Поль；Гилберт Келли Брюс
    申请人:Мидрекс Интернациональ Б.В.Роттердам, Цюрих Бранш (Фирма)；
    IPC主号:
    专利说明:

    (21) 4202226/02
    (22) 03/20/87
    (31) 842513
    (32) 03/21/86
    (33) US
    (46) 08/30/91. Bul №32
    (71) Midrex International B.V. Rotterdam, Zurich, Branche (NL)
    (72) Paul Max Love and Bruce Gilbert Kelly (US)
    (53) 669.421.183 (088.8)
    (56) Patent of the USSR
    № 978735.kl. From 21 to 13 / 00,1980
    (54) METHOD FOR OBTAINING METALLIZED BATH GRANULES FROM IRON OXIDES IN A MINE FURNACE AND A DEVICE FOR ITS IMPLEMENTATION
    (57) The invention relates to metallurgy, namely to the direct reduction of iron oxide and the production of hot metallized granules of hot iron of a spongy structure in a shaft furnace for direct reduction. The purpose of the invention is to increase the productivity of the furnace. The invention consists in the method of controlled mixing of volumes of cold natural gas with hot reducing, obtained by catalytic reforming with a final temperature of at least 700 ° C, and feeding the mixture to the lower zone of the furnace. The shaft furnace is equipped with an additional catalytic reforming unit with a pipeline, which is connected to the lower part of the furnace and a cold natural gas source by a pipeline, while the pipelines are equipped with measuring and regulating units for gas supply. The use of the invention makes it possible to increase the carbon content in the hot product without overcooling. 2 sec. and 8 hp ff, 1 ill.
    (L
    The invention relates to metallurgy, namely, direct reduction of iron oxide and the production of hot metalized granules or hot iron of a spongy structure in a shaft furnace for direct reduction, i.e. containing 75-85 or more percent of the metal.
    The purpose of the invention is to increase the productivity of the furnace upon receipt of the finished product with a high carbon content.
    The drawing shows a device for implementing the proposed method.
    The device comprises a vertical shaft-type reducing furnace 1 having an upper reducing zone 2 in the upper zone of the furnace, a zone 3 for introducing a reducing gas in the central zone of the furnace and a zone 4 for regulating carbon and unloading products in the lower part of the furnace. Iron oxide granules or other materials, such as lump ore, are loaded into a shaft furnace by gravity to form a cushion of particles of material containing iron oxide, or a mixture inside the shaft furnace. The metallized or recovered material is removed from the furnace through outlet 5 in its bottom. A reducing system 6 supplying reducing gas surrounds the shaft furnace. The hot reducing gas is introduced into the reduction zone through the VO gas.
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    inputs. The hot reducing gas flows inward and upward through the reducing zone in countercurrent with respect to the charge movement. The reducing gas reacts with silt. form a flue gas that exits the furnace through the flue pipe 7 at the top of the furnace.
    A reformer furnace 8, having fuel burners (not shown) and a plurality of catalytic tubes 9 of a direct externally heated heat exchanger, of which only one is shown, generates a hot reducing gas. The reformer furnace 8 is fed with process gas from source 6. The reducing gas is supplied from the catalyst-filled pipes 9 to the reduction zone through the tuyere system 6.
    A second catalytic reforming conversion furnace 10 having fuel burners (not shown) and a plurality of catalytic conversion pipes 11 of an indirect heat exchanger with external heating, of which only one is shown, generates gas. This gas flows from the catalyst-containing tubes 11 through the pipe 12 of the reformed gas to the hot runner 13. A pipeline of 1 liter connects the flow nozzle 13 With valve 15, which in turn is connected to the lower conical part of the furnace pipeline 1.
    The source of natural gas N is connected to the pipeline 16 by a pipeline 17 of natural gas, which has a measuring diaphragm 18 and a control valve 19 in the eye.
    The electric process control devices include a flow controller 20, which receives a signal from a hot flow nozzle 13 and controls a valve 15, a flow controller 21, which receives a signal from a natural gas orifice 18 and sends a signal to valve 19. Regulator The tori 20 and 21 of the flow are connected to the station 22 ratios, which is an automated controller using a computer. A sensor 23 installed in the lower part of the shaft furnace can be connected to the ratio controller 22 if desired, but it is usually supplied with an optical reading device for use by the operator Thermal sensor 24 in the pipe 16 from the side of the shaft furnace at the connection point of the pipe 17, which is The gas mixing point can also be connected to station 22 ratios. Gas analyzer 25 in pipeline 16 near the shaft furnace, which is connected to station ratios 22, analyzes the methane content in gas in pipeline 16.
    During operation, the process gas from the source G, which may be the precursor exhaust gas from the gas outlet 7 of the shaft furnace, is reformed in the catalytic reforming furnace 8 mainly in CO and H2. The reformed gas is introduced directly into the reduction and tuyere system 6 as a reducing gas. The endothermic gas is produced in the rifurming unit 10 as a result of the reaction of the mixture of natural gas and air at a ratio of the air to the primson gas from 2: 1 to 3: 1. If desired, all or part of the air can be replaced by oxygen. In addition, natural gas can be replaced by any gaseous or gasified coal. An endothermic flow control valve, which is passed through a hot flow nozzle 13, which gives a signal to the flow controller 20, which energizes the hot valve
    5 15 dt maintain potka in the given parameters. Natural gas from the N PSD-Chest source to the system at ambient temperature and a diaphragm 18 is metered out. The measuring diaphragm generates a signal to the flow controller 21. The flow signal from the hot re-flow nozzle of the reformed gas is transmitted from the regulator.
    20 flow to the station 22 ratios.
    At the station, 22 ratios are calculated; the 5 th parameter is specified parameter for the controller
    21 flow of the natural pelvis and fed to him to the controller. With the help of this control system, a constant is maintained between the reformed
    0 and natural gases in the mixture. The gas analyzer 25 determines the methane content in the main mixture before it enters the lower cone and transmits the read value of methane to the ratio station 22, which controls the ratio of the natural gas flow to the endothermic gas flow, to obtain the desired methane content
    Thermal sensor 23, located in chamber 4 of the unloading of the furnace 1, records the temperature of the charge after it passes through the gas mixture inlet point. IF the temperature after the gas mixture is injected decreases too much,
    5, station 22 may either reduce the amount of natural gas in the mixture, or reduce the rate of flow of the mixture into the furnace. If the temperature in the discharge chamber 4 rises too much, natural gas can be increased, or the gas mixture inflow rate can be increased, both methods lower the temperature to the desired range. Station 22 determines which method should be chosen, that is, the ratio of the components in the mixture or changes the mixture flow rate depending on the temperature of the mixture recorded by the thermal sensor 24. As the addition of natural gas decreases, this temperature approaches the temperature of the hot endothermic gas taking into account the internal heat loss in the pipeline. A sharp increase in temperature, detected by the thermal sensor 23 in the product discharge chamber, may indicate that the CO reaction is too large. In this case, increase the flow of natural gas in order to avoid local overheating of the charge.
    The invention solves the problem associated with the permissible cooling of direct reduction iron by endothermic cleavage of methane to produce carbon and by exothermic dissociation of carbon monoxide to produce carbon, thus balancing the exothermic and endothermic reactions in the discharge part of the shaft furnace.
    权利要求:
    Claims (10)
    [1]
    1. A method of producing metallized iron oxide pellets in a shaft furnace, including loading the material into the shaft furnace from above, producing a reducing gas by catalytic reforming and blowing it into the middle RFID for reducing countercurrent with a descending material, removing and recycling the top gas, blowing the hydrocarbon - holding gases to the unloading zone, carburizing the product and unloading it from the furnace, characterized in that, in order to increase the productivity of the furnace when preparing a finished product with increased A mixture of cold natural gas and hot reducing gas produced by oxygen or air or oxygen-air catalytic conversion of hydrocarbon-containing gases in the reformer is introduced into the unloading zone of the furnace, and the carbon content in the final product is controlled by changing the velocities entering cold natural and hot reducing gases,
    [2]
    2. Method according to claim 1, characterized in that the temperature of the gas mixture supplied to the discharge zone is set to at least 700 ° C.
    [3]
    3. The method according to claim 1, characterized in that as hydrocarbon containing
    gases use methane, natural gas, recirculated top gas, or a mixture thereof.
    [4]
    4. Method according to paragraphs. 1-3, about tl and h and y y and y with the fact that hot reducing
    gas is obtained at a volume ratio of natural gas and air of 1: 2-3.
    [5]
    5. A device for producing metallized granules of iron oxides in a shaft furnace containing a shaft furnace with
    the upper section, the intermediate reduction section, the carbonization and unloading section of the product from the bottom of the furnace, the bottom discharge mechanism, the means for introducing the reducing gas and top gas removal and its recirculation, a catalytic reforming unit connected by pipeline to the shaft kiln recovery section, sources of natural and process gases, input tools
    a process gas in a catalytic reformer and connecting pipes, characterized in that it is equipped with an additional catalytic reformer and a pipeline with means for controlling the amount of injected gases connecting the additional catalytic reformer and a source of natural gas to the carburizing and unloading section of the finished product.
    [6]
    6. The device according to claim 5, characterized in that the means for controlling the amount of gases introduced in the pipeline from the additional reforming unit
    made in the form of a flow nozzle and a control valve connected to it.
    [7]
    7. The device according to claim 5, characterized in that the means for regulating the amount of supplied gases placed on
    pipeline from a source of natural gas, made in the form of a measuring diaphragm and a flow control valve with its means of control.
    [8]
    8. The device according to claim 7, characterized in that the valve control means are made in the form of gas flow controllers.
    [9]
    9. The device according to claim 5, characterized in that it is provided with a regulator
    gas flow ratios and a computer connected to it.
    [10]
    10. The device according to claim 5, of which it is provided with means
    determining the temperature and transmitting the data to the control means, installed after the connection point of the reducing gas pipelines from the additional reformer and the source of natural gas.
    类似技术:
    公开号 | 公开日 | 专利标题
    US4054444A|1977-10-18|Method for controlling the carbon content of directly reduced iron
    US4046557A|1977-09-06|Method for producing metallic iron particles
    EP2421941B1|2017-06-21|Method for sequestering carbon dioxide from a spent gas
    SU1674693A3|1991-08-30|Method and device for producing metallized iron oxide granules in a shaft furnace
    US5858057A|1999-01-12|Method for producing direct reduced iron with a controlled amount of carbon
    US5618032A|1997-04-08|Shaft furnace for production of iron carbide
    MX2011003644A|2011-07-28|Process for production of direct reduced iron.
    SU1718725A3|1992-03-07|Method and device for producing metallized granules from iron oxides in a shaft furnace
    US3749386A|1973-07-31|Method and means for reducing iron oxides in a gaseous reduction process
    US4253867A|1981-03-03|Method of using a methane-containing gas for reducing iron ore
    SU1001863A3|1983-02-28|Process for reducing metal ore
    US4246024A|1981-01-20|Method for the gaseous reduction of metal ores using reducing gas produced by gasification of solid or liquid fossil fuels
    US3816102A|1974-06-11|Method and apparatus for reducing particulate metal ores to sponge metal and cooling the reduced metal
    GB2058841A|1981-04-15|Method of making sponge iron
    US2990269A|1961-06-27|Refining of ores with hydrocarbon gases
    WO2017046653A1|2017-03-23|Method and apparatus for the direct reduction of iron ores utilizing coal-derived gas or syngas, with improved energy efficiency
    US4556417A|1985-12-03|Process for the direct reduction of iron ores
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    US4131452A|1978-12-26|Method for direct manufacture of crude steel
    US4365789A|1982-12-28|Apparatus for the direct reduction of iron in a shaft furnace using gas from coal
    US2795497A|1957-06-11|Method and apparatus for producing molten iron
    EP0209861B1|1991-05-02|Melt-reductive iron making method from iron ore
    US6183535B1|2001-02-06|Method for increasing the capacity of a direct reduced iron plant without increasing its reformer capacity
    US9938595B2|2018-04-10|Direct reduction process with improved product quality and process gas efficiency
    US4049440A|1977-09-20|Method for producing metallic iron pellets
    同族专利:
    公开号 | 公开日
    ATA64687A|1991-09-15|
    CA1287209C|1991-08-06|
    DE3709071A1|1987-09-24|
    GB8706027D0|1987-04-15|
    US4702766A|1987-10-27|
    JPH0246644B2|1990-10-16|
    MX166840B|1993-02-09|
    DE3709071C2|1993-08-05|
    JPS62263910A|1987-11-16|
    AT394394B|1992-03-25|
    MY100193A|1990-03-29|
    GB2188067B|1990-01-10|
    GB2188067A|1987-09-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4054444A|1975-09-22|1977-10-18|Midrex Corporation|Method for controlling the carbon content of directly reduced iron|
    GB2064590B|1979-09-11|1984-07-25|Kobe Steel Ltd|Gas reduction of iron oxide|
    US4224057A|1979-08-20|1980-09-23|Hylsa, S.A.|Method for carburizing sponge iron|
    US4261734A|1979-09-04|1981-04-14|Hylsa, S.A.|Method of making sponge iron|
    US4333761A|1979-10-22|1982-06-08|Midrex Corporation|Method for direct reduction of iron using high sulfur gas|
    DE3317701C2|1983-05-16|1986-08-07|Hylsa S.A., Monterrey, N.L.|A method of operating a vertical shaft moving bed reduction reactor for reducing iron ore to sponge iron|US4897113A|1985-09-23|1990-01-30|Hylsa, S.A.|Direct reduction process in reactor with hot discharge|
    US4834792A|1986-08-21|1989-05-30|Hylsa S.A. De C.V.|Method for producing hot sponge iron by introducing hydrocarbon for carburizing into reduction zone|
    CA2090906A1|1992-03-05|1993-09-06|Corporacion Venezolana De Guayana |Method for improving quality of reforming gas used in the direct reduction of metal oxides|
    US6342089B1|1997-09-02|2002-01-29|Mcgaa John R.|Direct reduced iron pellets|
    AU2006284620B2|2005-08-30|2010-12-16|E. I. Du Pont De Nemours And Company|Ore reduction process and titanium oxide and iron metallization product|
    US8372179B2|2007-10-15|2013-02-12|E I Du Pont De Nemours And Company|Ore reduction process using carbon based materials having a low sulfur content and titanium oxide and iron metallization product therefrom|
    WO2018057025A1|2016-09-20|2018-03-29|Midrex Technologies, Inc.|Methods and systems for increasing the carbon content of sponge iron in a reduction furnace|
    US10508314B2|2015-06-24|2019-12-17|Midrex Technologies, Inc.|Methods and systems for increasing the carbon content of sponge iron in a reduction furnace|
    US10316376B2|2015-06-24|2019-06-11|Midrex Technologies, Inc.|Methods and systems for increasing the carbon content of sponge iron in a reduction furnace|
    CN108474048B|2015-12-28|2021-02-23|伊尔技术有限公司|Method and system for producing high carbon DRI by using syngas|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/842,513|US4702766A|1986-03-21|1986-03-21|Method of increasing carbon content of direct reduced iron and apparatus|
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