• 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 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 reducing 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 reformed 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 reformer and the source of natural gas.
    公开号:SU1718725A3
    申请号:SU874202225
    申请日:1987-03-20
    公开日:1992-03-07
    发明作者:Нил Фрилэнд Михаэль；Дарел Хьюс Грегори
    申请人:Мидрекс Интернациональ Б.В., Роттердам, Цюрих, Бранш (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to metallurgy, the direct reduction of iron oxide to obtain hot metallized (i.e., containing more than 75% metal, usually more than 85% metallic iron in the finished product) groups or hot iron of a spongy structure in a shaft furnace with- recovery. k
    The purpose of the invention is. increasing the furnace penetration rate in obtaining the finished product with a high carbon content.: .. ;; The drawing shows a diagram showing the operation of the device. :
    The vertical reduction furnace 1 of the mine type has an upper reduction zone 2, a zone 3 for introducing a regeneration gas in the central zone of the furnace and a zone 4 for regulating carbon and discharging
    products at the bottom of the oven. Iron oxide granules, or other materials, such as lump ore, are loaded into a shaft furnace under the action of gravity to form a moving layer consisting of particles of material containing iron oxide, or charge, inside the shaft furnace. The metalized or recovered material is removed from the furnace through exit 5 at its bottom. Recovery and tuyere system 6 surrounds the shaft furnace. The hot reducing gas is introduced into the reducing zone through gas ports in the gas reducing system. The hot reducing gas flows inward and upward through the reducing zone in countercurrent relative to the direction of movement of the charge under the action of gravity. The reducing gas reacts
    00
    h ate

    s
    with the mixture, forming a flue gas that exits the furnace through the exhaust pipe 7 in the upper part of the furnace.
    A reforming furnace 8 having fuel burners and a plurality of catalytic tubes 9 of an indirect heat exchanger with external heating (only one is shown) generates a hot reducing gas. The reducing gas flows from the catalyst tubes 9 through the pipe 10 of the reformed gas. A part of the reformed gas passes through the pipeline 11 to the reduction and tuyere system 6, the second part of the reformed gas flows through the pipeline 12 to the hot flow nozzle 13. The gas tube 14 connects the flow nozzle to the valve 15, which is connected to the lower conical part. 4 furnace pipe 16.
    The natural gas source N is connected to the pipeline 16 by a pipe 17 for natural gas, which has a measuring diaphragm 18 and a flow control valve 19.
    The electric process control devices include a flow controller 20, which receives a signal from a hot flow nozzle 13 and controls a valve, m 15, a flow controller 21, which receives a signal from a natural gas orifice 18 and sends a signal to valve 19 Both flow controllers 20 and 21 are connected to station 22 ratios, which is an automated computer control unit. A temperature sensor 23 installed in the lower part of the shaft furnace can be connected to station 22 of ratios, but it is usually supplied with an optical readout device used by the operator. The sensor 24 in the pipe 16 from the side of the shaft furnace at the point where the tube 17 is connected, which is the mixing point of gases, can also be connected to station 22 ratios. The gas analyzer 25 in the pipeline 16 near the shaft furnace, which is connected to the station of 22 ratios, analyzes the methane content in the pipeline 16.
    During operation, the process gas from source G., which may be exhaust gas from the gas outlet 1 of the shaft furnace, natural gas, methane, or their mixture, is reformed mainly in CO and H2. The reformed gas is separated, partially coming directly into the P recovery and tuyere system 6 as a local fresh gas, and the second part passes through a hot flow nozzle 13, which gives a signal to the flow controller 20, which energizes the hot valve 15 to maintain flow In predetermined parameters, Natural gas from the N source is supplied to the system at ambient temperature and is metered through the diaphragm 18. The measuring diaphragm generates a signal to the flow controller 21. The flow signal from the reformed gas hot flow nozzle is transmitted from the flow controller 20 to the ratio station 22.
    At the ratio station 22, a predetermined parameter is calculated for the regulator 21 of the natural gas stream and is transmitted to the controller 21 for implementation. With this control system, a constant ratio between the reformed gas and the natural gas in the mixture is maintained. The gas analyzer 25 determines the methane content (CH / j) in the gas 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 reformed gas flow to obtain the desired methane content.
    A thermal sensor 23 located in the zone 4 of the product discharge of the furnace 1 records the temperature of the charge after it passes through the gas mixture inlet point. If the temperature after entering the gas mixture decreases too much, station 22 can either reduce the amount of natural gas in the mixture, or reduce the rate at which the mixture flows into the furnace or, by reducing the amount of natural gas in the mixture, increase the flow into the furnace. If the temperature in discharge zone 4 rises too much, the flow of natural gas can be increased, or the gas flow rate is increased or both of these methods reduce the temperature to the desired range. Station 22 determines which method to select, i.e. changes the ratio of components in the mixture or changes the flow rate of the mixture depending on the temperature of the mixture recorded by the thermal sensor 24. As the extraction of natural gas decreases, this temperature approaches the temperature of the hot reformed gas taking into account the internal heat losses 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 the flow of natural gas should be increased to avoid local overheating of the charge. Carbon content in
    the finished metallized granular iron depends on the content of hydrocarbon gas in the mixture, determined by mixing the mixture components in the appropriate ratio to equalize the endothermic
    exothermic reactions in zone 4 unloading products from the furnace.
    The invention solves the problem of cooling direct-flow iron by endothermic cleavage of methane or its equivalent to produce carbon and through 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 (4)
    [1]
    Invention Formula
    1. A method of producing metallized granules of iron oxides in a shaft furnace, including loading the material into the shaft furnace from the top, producing a reduction. gas by catalytic reforming and its injection into the middle zone of the furnace for reduction in countercurrent with the descending material, removal and recirculation of the top gas, injection of hydrocarbon-containing gases into the discharge zone, carbonization of the product and discharge it from the furnace, characterized in that, in order to increase productivity the furnace upon receipt of the finished product with a high carbon content, a mixture of cold natural gas and hot reducing gas produced by catalytic reformer is introduced into the discharge zone of the furnace ingom and the carbon content is controlled by changing the mixing ratio or the rate of its input ..
    2. The method according to claim 1, about tl and h and y and the fact that as the gas supplied to the reforming unit, use methane, natural gas, recirculated gas or a mixture thereof.
    [2]
    3. Device dl. the preparation of metallized granules from iron oxides. containing a shaft furnace with an upper section, a middle reducing section, a lower section of the carbonization and unloading of the product, the mechanism of this unloading, means for introducing the reducing gas and exhaust gas and its recycling, a source of natural gas and a catalytic reforming unit, a source and means for introducing process gas in the installation of the reformer - 5 mina and connecting pipelines, it is t of the fact that, in order to increase productivity in the production of the finished product with increased soda carbon, the device is sabrezh but two additional pipelines, the first of which connects the catalytic reforming unit to the carburizing area of the finished product unloading, and the second connects the first additional
    [3]
    5 pipeline with a source of natural gas, while both pipelines are equipped with means for regulating the quantities of gases supplied
    4. An apparatus according to claim 3, characterized in that the means for controlling the amounts of supplied gases are made in the form of a flow nozzle of hot gas and an associated control valve with means for controlling it.
    [4]
    55. The device according to claim 3, is characterized in that the means for controlling the amounts of gases in the pipeline from the source of natural gas are made in the form of a measuring diaphragm and an associated control valve with control means.
    6. The device according to paragraphs. 5, characterized in that the means for controlling the control valves;
    5 form of gas flow controllers.
    7. Device. According to PP, 3 and 6, that is, that it is equipped with a computer connected to the means of controlling the amount of supplied gases, which
    0 connected to gas flow controllers.
    8. The device according to Clause 3, of which is provided with a thermal sensor installed inside the furnace in the area of carbonization between the gas under the conduit pipe and the discharge mechanism.
    9. The device according to Clause 3, characterized in that it is equipped with a gas analyzer installed in the gas supply pipeline to the carburizing section.
    010. The device according to p.
    This is due to the fact that it is equipped with a temperature sensor installed on the gas supply pipe after connecting it to the plunger Odom from a source of natural gas.
    ten
    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
    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
    MX2011003644A|2011-07-28|Process for production of direct reduced iron.
    US5618032A|1997-04-08|Shaft furnace for production of iron carbide
    US4253867A|1981-03-03|Method of using a methane-containing gas for reducing iron ore
    SU1001863A3|1983-02-28|Process for reducing metal ore
    SU1674693A3|1991-08-30|Method and device for producing metallized iron oxide granules in a shaft furnace
    US3816101A|1974-06-11|Method for reducing iron oxides in a gaseous reduction process
    KR850001644B1|1985-11-06|Direct reduction of iron using coke oven gas
    US3816102A|1974-06-11|Method and apparatus for reducing particulate metal ores to sponge metal and cooling the reduced metal
    CA1075913A|1980-04-22|Method and apparatus for producing metallic iron particles
    US4439233A|1984-03-27|Direct reduction of iron
    US4365789A|1982-12-28|Apparatus for the direct reduction of iron in a shaft furnace using gas from coal
    US2625463A|1953-01-13|Method for producing hydrogen cyanide
    US4536213A|1985-08-20|Reforming of higher hydrocarbons for metal oxide reduction
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    US3799521A|1974-03-26|Method and apparatus for the gaseous reduction of iron ore to sponge iron
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    US4042226A|1977-08-16|Method and apparatus for producing metallic iron pellets
    CN107881280A|2018-04-06|It is a kind of to reduce and cool down the system and method for metallized pellet
    同族专利:
    公开号 | 公开日
    MY101171A|1991-07-31|
    JPS62263911A|1987-11-16|
    GB2188066B|1989-11-15|
    DE3709072A1|1987-09-24|
    US4752329A|1988-06-21|
    CA1287216C|1991-08-06|
    DE3709072C2|1993-05-06|
    GB2188066A|1987-09-23|
    ATA64587A|1991-09-15|
    AT394393B|1992-03-25|
    JPH0246645B2|1990-10-16|
    MX165753B|1992-12-03|
    GB8706026D0|1987-04-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EA008111B1|2005-10-25|2007-04-27|Ооо "Сибтермо"|Device for processing solid fuel|US4054444A|1975-09-22|1977-10-18|Midrex Corporation|Method for controlling the carbon content of directly reduced iron|
    US4032120A|1975-11-10|1977-06-28|Midrex Corporation|Apparatus for direct reduction of sulfur-containing iron ore|
    GB2016124B|1978-03-11|1982-06-09|Hamburger Stahlwerke Gmbh|Rocess and apparatus for the direct reduction of iron ores|
    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|
    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|
    AUPN639995A0|1995-11-03|1995-11-30|Technological Resources Pty Limited|A method and an apparatus for producing metals and metal alloys|
    AUPO276496A0|1996-10-07|1996-10-31|Technological Resources Pty Limited|A method and an apparatus for producing metals and metal alloys|
    AT404600B|1997-03-12|1998-12-28|Voest Alpine Ind Anlagen|METHOD AND DEVICE FOR TREATING REDUCING GAS FOR REDUCING ORES|
    US5997596A|1997-09-05|1999-12-07|Spectrum Design & Consulting International, Inc.|Oxygen-fuel boost reformer process and apparatus|
    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|
    CN106755690A|2016-12-22|2017-05-31|泸天化（集团）有限责任公司|A kind of method that producing synthesis gas from coal reduction shaft furnace troilite produces sponge iron|
    DE102019217631A1|2019-11-15|2021-05-20|Thyssenkrupp Steel Europe Ag|Process for the direct reduction of iron ore|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/842,514|US4752329A|1986-03-21|1986-03-21|Apparatus and method for increasing carbon content of hot directly reduced iron|
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