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CN109737691A - 一种钢铁企业空气分离系统 - Google Patents

一种钢铁企业空气分离系统 Download PDF

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CN109737691A
CN109737691A CN201910107673.XA CN201910107673A CN109737691A CN 109737691 A CN109737691 A CN 109737691A CN 201910107673 A CN201910107673 A CN 201910107673A CN 109737691 A CN109737691 A CN 109737691A
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air
blast furnace
furnace gas
tower
heat exchanger
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CN109737691B (zh
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周乐
张卫军
张晓虎
刘石
闫小伟
李依擎
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Northeastern University China
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
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    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04175—Hot end purification of the feed air by adsorption of the impurities at a pressure of substantially more than the highest pressure column
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    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
    • F25J3/0426—The cryogenic component does not participate in the fractionation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
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    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04296—Claude expansion, i.e. expanded into the main or high pressure column
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/12—Refinery or petrochemical off-gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/18—H2/CO mixtures, i.e. synthesis gas; Water gas, shifted synthesis gas or purge gas from HYCO synthesis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/02—Compressor intake arrangement, e.g. filtering or cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/14—External refrigeration with work-producing gas expansion loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop

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Abstract

本发明公开了一种钢铁企业空气分离系统，第一高炉煤气膨胀机的出口与第一高炉煤气换热器相连，第二高炉煤气膨胀机的入口与第一高炉煤气换热器相连、出口与第二高炉煤气换热器相连，第三高炉煤气膨胀机的入口与第二高炉煤气换热器相连、出口依次与主换热器及第一空气预冷器相连；第一空气预冷器依次与空气压缩机、第二空气预冷器、分子筛纯化器、主换热器、空气膨胀机及精馏塔下塔的加工空气入口相连；精馏塔上塔的液氧出口、污氮出口及氮气出口分别与主换热器相连。本发明通过对高炉煤气余压余能的充分利用，避免了能量的浪费和对污氮加热所产生的额外能耗，实现了钢铁企业空气分离系统的节能低耗运行，具有巨大的经济效益及生态效益。

Description

一种钢铁企业空气分离系统
技术领域
本发明涉及一种空气分离系统，具体为一种钢铁企业空气分离系统。
背景技术
众所周知中国是世界产钢大国，在钢铁企业中炼钢是用氧大户，氧气的可靠供应是保证钢铁正常生产的关键因素之一，据统计目前我国钢铁企业每年需要的氧气量高达210亿立方米而且还有进一步增加的趋势。此外，空气的另一种主要气体产品氮气也广泛应用于钢铁联合企业，如转炉溅渣护炉、料仓密封、高炉炉顶密封等。
目前，钢铁企业空气分离主要采用深度冷冻法，常规电压缩制冷的空气分离技术耗电十分高，设备能耗约占空分成本的70％～80％，因此研究节能、高效的空气分离技术迫在眉睫。在传统炼铁高炉工艺流程中高炉炉顶压力可达150～200KPa，高压高炉煤气在膨胀机内等熵膨胀可以获得大量冷能，合理地回收利用该部分冷能可以提高空分设备效率，大幅降低钢铁企业空分成本。
钢铁企业中高炉煤气用户所要求的高炉煤气入口压力一般为8-10KPa，利用高炉煤气等熵膨胀将其压力从150～200KPa降至8-10KPa所获得的温度约为-15～-20℃，而常规低温空分工艺温度约为-173～-196℃，因此，为实现利用高炉煤气余压余能进行空分需要对高炉煤气余压余能回收利用方式及低温空分工艺流程加以改进。
发明内容
针对钢铁企业现有低温空分设备能耗过高以及高炉煤气等熵膨胀后温度难以满足低温空分工艺需求等不足，本发明要解决的问题是提供一种通过对高炉煤气余压余能的充分利用，实现钢铁企业空分设备节能低耗运行的钢铁企业空气分离系统。
为解决上述技术问题，本发明采用的技术方案是：
本发明一种钢铁企业空气分离系统，包括第一高炉煤气膨胀机、第一高炉煤气换热器、第二高炉煤气膨胀机、第二高炉煤气换热器、第三高炉煤气膨胀机、空气膨胀机、第一空气预冷器、空气压缩机、第二空气预冷器、分子筛纯化器、主换热器、精馏塔下塔、精馏塔上塔；其中，第一高炉煤气膨胀机的出口与第一高炉煤气换热器的低温侧相连；第二高炉煤气膨胀机的入口与第一高炉煤气换热器的高温侧相连、出口与第二高炉煤气换热器的低温侧相连；第三高炉煤气膨胀机的入口与第二高炉煤气换热器的高温侧相连、出口依次与主换热器的高炉煤气通路及第一空气预冷器的高炉煤气侧相连；第一空气预冷器的空气侧依次与空气压缩机、第二空气预冷器的空气侧、分子筛纯化器、主换热器的空气通路、空气膨胀机及精馏塔下塔的加工空气入口相连；精馏塔上塔的液氧出口与主换热器的液氧通路相连，精馏塔上塔的污氮出口与主换热器的污氮通路相连，精馏塔上塔的氮气出口与主换热器的氮气通路相连。
所述第一高炉煤气膨胀机、第二高炉煤气膨胀机、第三高炉煤气膨胀机及空气膨胀机分别于第一发电机、第二发电机、第三发电机及第四发电机同轴相连。
所述空气压缩机与电动机同轴相连。
所述精馏塔下塔与精馏塔上塔通过蒸发冷凝器相连，其中蒸发冷凝器的冷凝侧与精馏塔下塔连通、蒸发侧与精馏塔上塔连通。
所述精馏塔下塔的液氮出口通过第一节流阀与精馏塔上塔的液氮入口相连，精馏塔下塔的富氧液空出口通过第二节流阀与精馏塔上塔的富氧液空入口相连。
所述污氮经第二空气预冷器与空气换热后可用作分子筛纯化器的再生气。
本发明具有以下有益效果及优点：
1.本发明通过利用高炉煤气余压推动膨胀机发电，实现了对高炉煤气压力能的回收利用，避免了能量的浪费；
2.本发明通过对膨胀做功后的低温高炉煤气的合理利用，实现了钢铁企业空分设备的节能低耗运行，与常规低温空分系统相比节省了大量电能；
3.本发明通过回收高压空气膨胀功进行发电，对空气完成冷却降温的同时提高了能量的利用效率；
4.本发明通过利用与经过压缩的高温高压空气换热后的高温污氮作为分子筛纯化器的再生气，既实现了对空气冷却降温，同时避免了采用电热装置对污氮加热所产生的额外能耗。
附图说明
图1为本发明一种钢铁企业空气分离系统的系统原理图。
其中，1为第一高炉煤气膨胀机，2为第一发电机，3为第一高炉煤气换热器，4为第二高炉煤气膨胀机，5为第二发电机，6第二高炉煤气换热器，7为第三高炉煤气膨胀机，8为第三发电机，9为空气膨胀机，10为第四发电机，11为第一空气预冷器，12为电动机，13为空气压缩机，14为第二空气预冷器，15为分子筛纯化器，16为主换热器，17为精馏塔下塔，18为蒸发冷凝器，19为精馏塔上塔，20为第一节流阀，21为第二节流阀。
具体实施方式
下面结合说明书附图对本发明作进一步阐述。
如图1所示，本发明一种钢铁企业空气分离系统，包括第一高炉煤气膨胀机1、第一高炉煤气换热器3、第二高炉煤气膨胀机4、第二高炉煤气换热器6、第三高炉煤气膨胀机7、空气膨胀机9、第一空气预冷器11、空气压缩机13、第二空气预冷器14、分子筛纯化器15、主换热器16、精馏塔下塔17、精馏塔上塔19；其中，第一高炉煤气膨胀机1的出口与第一高炉煤气换热器3的低温侧相连；第二高炉煤气膨胀机4的入口与第一高炉煤气换热器3的高温侧相连、出口与第二高炉煤气换热器6的低温侧相连；第三高炉煤气膨胀机7的入口与第二高炉煤气换热器6的高温侧相连、出口依次与主换热器16的高炉煤气通路及第一空气预冷器11的高炉煤气侧相连；第一空气预冷器11的空气侧依次与空气压缩机13、第二空气预冷器14的空气侧、分子筛纯化器15、主换热器16的空气通路、空气膨胀机9及精馏塔下塔17的加工空气入口相连；精馏塔上塔19的液氧出口与主换热器16的液氧通路相连，精馏塔上塔19的污氮出口与主换热器16的污氮通路相连，精馏塔上塔19的氮气出口与主换热器16的氮气通路相连。
所述第一高炉煤气膨胀机1、第二高炉煤气膨胀机4、第三高炉煤气膨胀机7及空气膨胀机9分别于第一发电机2、第二发电机5、第三发电机8及第四发电机10同轴相连。
所述空气压缩机13与电动机12同轴相连。
所述精馏塔下塔17与精馏塔上塔19通过蒸发冷凝器18相连，其中蒸发冷凝器18的冷凝侧与精馏塔下塔17连通、蒸发侧与精馏塔上塔19连通。
所述精馏塔下塔17的液氮出口通过第一节流阀20与精馏塔上塔19的液氮入口相连，精馏塔下塔17的富氧液空出口通过第二节流阀21与精馏塔上塔19的富氧液空入口相连。
所述污氮经第二空气预冷器14与空气换热后可用作分子筛纯化器15的再生气。
本实施例中，来自高炉煤气管网的高炉煤气压力约150KPa，温度约30℃，膨胀后压力降至约10KPa，各台膨胀机绝热效率均为80％。
来自高炉煤气管网的高压高炉煤气进入第一高炉煤气膨胀机1，带动第一发电机2发电，对外输出电能，做功后的高炉煤气温度降至约-24℃，之后进入第一高炉煤气换热器3换热后送往高炉煤气用户；来自高炉煤气管网的高压高炉煤气进入第一高炉煤气换热器3与-24℃的低温高炉煤气换热后温度降至约-20℃，之后进入第二高炉煤气膨胀机4，带动第二发电机5发电，对外输出电能，做功后的高炉煤气温度降至约-66℃，之后进入第二高炉煤气换热器6换热后送往高炉煤气用户；来自高炉煤气管网的高压高炉煤气进入第二高炉煤气换热器6与-66℃的低温高炉煤气换热后温度降至约-63℃，之后进入第三高炉煤气膨胀机7，带动第三发电机8发电，对外输出电能，做功后的高炉煤气温度降至约-101℃，之后依次流经主换热器16及第一空气预冷器11分别对空气进行冷却降温后送往高炉煤气用户。
空气经第一空气预冷器11冷却降温后进入空气压缩机13加压至2MPa，压缩后的高压空气依次经第二空气预冷器14冷却降温、分子筛纯化器15净化、主换热器16冷却降温进入空气膨胀机9，带动第四发电机10发电，对外输出电能，膨胀做功后的空气压力降至约0.5MPa，温度降至该压力下的饱和温度，之后进入精馏塔下塔17底部，低温低压空气自下而上穿过塔板，至精馏塔下塔17上部得到高纯度的氮气，氮气在蒸发冷凝器中被冷凝成液氮。一部分液氮作为回流液自上而下沿塔板流下，到达精馏塔下塔17底部成为含氧36％～40％的富氧液空，另一部分液氮聚集在液氮槽中经第一节流阀20降压降温后送入精馏塔上塔19顶部作为上塔的回流液；精馏塔下塔17底部的富氧液空经第二节流阀21降压降温后送入精馏塔上塔19中部，自上而下沿塔板流下与上升蒸汽接触，每经过一块塔板便蒸发掉部分氮气，同时得到部分气体中冷凝出来的氧气，最终在精馏塔上塔19底部获得高纯度液氧，在精馏塔上塔19顶部获得高纯度氮气。高纯度液氧和高纯度氮气从精馏塔引出经主换热器16换热对空气冷却降温后送入容器内储存或送往用户处；从精馏塔上塔19上部引出部分污氮经主换热器16换热对空气降温后进入第二空气预冷器14与高温高压空气换热后的作为分子筛纯化器15的再生气。
以上，仅为本发明的较佳实施例，但本发明的保护范围并不局限于此，凡采用等同替换或等效变换所形成的技术方案，都应涵盖在本发明的保护范围之内。

Claims (6)

1.一种钢铁企业空气分离系统，其特征在于：包括第一高炉煤气膨胀机、第一高炉煤气换热器、第二高炉煤气膨胀机、第二高炉煤气换热器、第三高炉煤气膨胀机、空气膨胀机、第一空气预冷器、空气压缩机、第二空气预冷器、分子筛纯化器、主换热器、精馏塔下塔、精馏塔上塔；其中，第一高炉煤气膨胀机的出口与第一高炉煤气换热器的低温侧相连；第二高炉煤气膨胀机的入口与第一高炉煤气换热器的高温侧相连，出口与第二高炉煤气换热器的低温侧相连；第三高炉煤气膨胀机的入口与第二高炉煤气换热器的高温侧相连，出口依次与主换热器的高炉煤气通路及第一空气预冷器的高炉煤气侧相连；第一空气预冷器的空气侧依次与空气压缩机、第二空气预冷器的空气侧、分子筛纯化器、主换热器的空气通路、空气膨胀机及精馏塔下塔的加工空气入口相连；精馏塔上塔的液氧出口与主换热器的液氧通路相连，精馏塔上塔的污氮出口与主换热器的污氮通路相连，精馏塔上塔的氮气出口与主换热器的氮气通路相连。
2.根据权利要求1所述的钢铁企业空气分离系统，其特征在于：所述第一高炉煤气膨胀机、第二高炉煤气膨胀机、第三高炉煤气膨胀机及空气膨胀机分别与第一发电机、第二发电机、第三发电机及第四发电机同轴相连。
3.根据权利要求1所述的钢铁企业空气分离系统，其特征在于：所述空气压缩机与电动机同轴相连。
4.根据权利要求1所述的钢铁企业空气分离系统，其特征在于：所述精馏塔下塔与精馏塔上塔通过蒸发冷凝器相连，其中蒸发冷凝器的冷凝侧与精馏塔下塔连通，蒸发侧与精馏塔上塔连通。
5.根据权利要求1所述的钢铁企业空气分离系统，其特征在于：所述精馏塔下塔的液氮出口通过第一节流阀与精馏塔上塔的液氮入口相连，精馏塔下塔的富氧液空出口通过第二节流阀与精馏塔上塔的富氧液空入口相连。
6.根据权利要求1所述的钢铁企业空气分离系统，其特征在于：所述污氮经主换热器、第二空气预冷器与空气换热后用作分子筛纯化器的再生气。
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