CN201173660Y - 一种中小型多工况节能型空分设备 - Google Patents

一种中小型多工况节能型空分设备 Download PDF

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Publication number
CN201173660Y
CN201173660Y CNU200820084257XU CN200820084257U CN201173660Y CN 201173660 Y CN201173660 Y CN 201173660Y CN U200820084257X U CNU200820084257X U CN U200820084257XU CN 200820084257 U CN200820084257 U CN 200820084257U CN 201173660 Y CN201173660 Y CN 201173660Y
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China
Prior art keywords
air
separation plant
air separation
compressor
valve
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CNU200820084257XU
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English (en)
Inventor
葛水福
葛浩华
葛浩俊
马金亮
许立国
向云华
蒋吉林
黄孝文
田曙光
陈海大
任智军
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Hangzhou Fortune Cryogenic Equipment Co ltd
Hangzhou Fortune Industry Group Co.,Ltd.
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HANGZHOU FUSIDA GAS EQUIPMENT CO Ltd
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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
    • F25J3/04151—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
    • 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
    • F25J3/04248—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
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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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
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
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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
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    • F25J3/04642—Recovering noble gases from air
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    • F25J3/04678—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser cooled by oxygen enriched liquid from high pressure column bottoms
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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
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    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04654—Producing crude argon in a crude argon column
    • F25J3/04666—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system
    • F25J3/04672—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser
    • F25J3/04703—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser being arranged in more than one vessel
    • 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
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04654—Producing crude argon in a crude argon column
    • F25J3/04709—Producing crude argon in a crude argon column as an auxiliary column system in at least a dual pressure main column system
    • F25J3/04715—The auxiliary column system simultaneously produces oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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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
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    • 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
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04721—Producing pure argon, e.g. recovered from a crude argon column
    • F25J3/04727—Producing pure argon, e.g. recovered from a crude argon column using an auxiliary pure argon column for nitrogen rejection
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    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
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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
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    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04775—Air purification and pre-cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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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
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    • F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
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    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
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    • F25J3/04787—Heat exchange, e.g. main heat exchange line; Subcooler, external reboiler-condenser
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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
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Abstract

本实用新型涉及一种气体分离设备，尤其是一种空气分离设备。本实用新型包括空气过滤器、空气压缩机、空气预冷***、空气纯化器、分镏塔***、增压透平膨胀机、氧气压缩机、仪控***、电控***；各***依次通过管道、阀门，采用法兰或焊接结构联接在一起，形成一套完整的空分设备。本实用新型采用了分子筛常温吸附，增压透平膨胀机膨胀制冷，规整填料上塔等先进技术，使设备具有净化效果好，制冷效率高，上塔阻力小，氧提取率高等优点。同时，由于采用变工况技术使操作弹性大，产量变动幅度大，既满足用户的不同工况下的用氧需要，同时以能达到节能的目的。

Description

一种中小型多工况节能型空分设备
技术领域
本实用新型涉及一种气体分离设备，尤其是一种空气分离设备。
背景技术
从前的中小型空气分离设备按操作压力等级分为高压和中压两种，没有全低压空分设备，高压为10～15MPa，中压为3～4MPa。高压、中压空分设备能耗高，生产每立方米氧气的耗电为1.2～1.4度电，而且高压、中压空分设备由于压力高、操作安全性差，经常发生设备损坏，人生伤亡事故、操作维修难度大，制造成本高。
自九十年代开始研制全低压空分设备，操作压力在1～1.5MPa左右，单位氧气能耗在0.8～1.0度电，空分设备能耗有所降低，操作安全性也大有改善，缺点是只能单工况操作，产氧量调节范围在95％～105％之间，因此各用户自始至终存在用不了时被迫放空的问题，造成能源极大的浪费。
发明内容
本实用新型的目的是为了提供一种同一种设备能进行变工况生产从而实现用户用气量不均衡时，减少放空损失的中小型多工况节能型空分设备。
为实现本实用新型的目的，本说明书提供了一种中小型多工况节能型空分设备，包括空气过滤器、空气压缩机、空气预冷***、空气纯化器、分镏塔***、增压透平膨胀机、氧气压缩机、仪控***、电控***；各***依次通过管道、阀门，采用法兰或焊接结构联接在一起，形成一套完整的空分设备。
空气过滤器为自洁式空气过滤器，其清灰结构部件为无运动部件的脉冲喷吹型部件。空气压缩机为离心式空气压缩机。
空气预冷***包括半封闭活塞式制冷压缩机、冷凝器、蒸发器，热气旁通阀，依次通过管道、阀门，采用法兰或焊接联接在一起形成空气预冷***。
空气纯化器包括吸附筒、电加热器、放空消音器、仪表、电控***，依次通过管道、阀门，采用法兰或焊接结构联接在一起，形成空气净化***。。
分镏塔冷箱***包括上下塔、主换热器、过冷器、冷凝蒸发器、粗氩塔、粗氩冷凝器、纯氩塔、纯氩蒸发器、纯氩冷凝器、循环液氩泵，依次通过管道、阀门，采用法兰或焊接结构按流程图组合在一起，装在保冷箱，形成分镏塔***。
增压透平膨胀机直接装在冷箱内；或装在单独的小冷箱内，通过保温的过桥与冷箱连接。
本实用新型提供的中小型多工况节能型空分设备，采用了分子筛常温吸附，增压透平膨胀机膨胀制冷，规整填料上塔等先进技术，使设备具有净化效果好，制冷效率高，上塔阻力小，氧提取率高等优点。同时，由于采用变工况技术使操作弹性大，产量变动幅度大，既满足用户的不同工况下的用氧需要，同时以能达到节能的目的。
附图说明
图1～9是本实用新型的流程原理图。
具体实施方式
本实用新型的目的，特征及优点将结合实施例，参照附图作进一步的说明。通过实施例将有助于理解本实用新型，但不限制本实用新型的内容。本领域的普通技术人员能从本实用新型公开的内容直接导出或联想到的所有变形，均应认为是本实用新型的保护范围。
实施例1：这种中小型多工况节能型空分设备，包括空气过滤器、空气压缩机、空气预冷***、空气纯化器、分镏塔***、增压透平膨胀机、氧气压缩机、仪控***、电控***；各***依次通过管道、阀门，采用法兰或焊接结构联接在一起，形成一套完整的空分设备。
空气过滤器为自洁式空气过滤器，其清灰结构部件为无运动部件的脉冲喷吹型部件。空气压缩机为离心式空气压缩机。
空气预冷***包括半封闭活塞式制冷压缩机、冷凝器、蒸发器，热气旁通阀，依次通过管道、阀门，采用法兰或焊接联接在一起形成空气预冷***。
空气纯化器包括吸附筒、电加热器、放空消音器、仪表、电控***，依次通过管道、阀门，采用法兰或焊接结构联接在一起，形成空气净化***。。
分镏塔冷箱***包括上下塔、主换热器、过冷器、冷凝蒸发器、粗氩塔、粗氩冷凝器、纯氩塔、纯氩蒸发器、纯氩冷凝器、循环液氩泵，依次通过管道、阀门，采用法兰或焊接结构按流程图组合在一起，装在保冷箱，形成分镏塔***。
增压透平膨胀机直接装在冷箱内；或装在单独的小冷箱内，通过保温的过桥与冷箱连接。
本实用新型的工艺流程简述如下：
空气经空气过滤器过滤掉尘埃和机械杂质后进入空气压缩机，压缩并冷却后进入空气预冷***。空气在空气预冷***的预冷机组的蒸发器中被冷却降温，同时部分水份冷凝下来，出蒸发器的空气进入水分离器中除去游离水份后进入分子筛纯化***(分子筛纯化***由两台纯化器、两台电加热器组成，两台纯化器切换使用，当一台工作时，另一台被分镏塔来的污氮气经电加热器加热再生，空气中的水份、二氧化碳等经纯化器的吸附筒的剂吸附后进入后续***)。
从纯化器出来的净化空气，大部分进入主换热器与返流气体换热被冷却到接近液化的温度进入下塔，其余部分空气进入增压膨胀机增压端，吸收膨胀机释放的功被增压后进入增压机后冷却器到常温进入主换热器，冷却到一定温度后，送入到膨胀机，经膨胀制冷，大部分进入上塔参与精镏，其余部分进入污氮管经主换热器复热后出冷箱。
下塔中空气经过精镏，得到富氧液空、液氮、液空及液氮分别从下塔底部及冷凝蒸发器，被从上塔来的污氮气、氮气冷却过冷。富氧液空从过冷器抽出，大部分进入粗氩冷凝器作冷源，其余部分进入上塔参与精镏，进入粗氩冷凝器的液空汽化后进入上塔，液氮从过冷器抽出节流后进入上塔参与精镏。在上塔中，经过精镏分别在冷凝蒸发器底部、上塔底部及顶部得到液氧、氧气、污氮气和氮气。
氧气从上塔底部抽出进入主换热器复热到常温出冷箱去氧气压缩机。
液氧从冷凝蒸发器抽出，送出冷箱进入用户贮槽。
污氮气从上塔上部抽出进入过冷器，热交换后进入主换热器，部分复热后进入分子筛纯化***，作为分子筛再生气。
氮气从上塔顶部抽出进入过冷器，热交换后进入主换热器，复热后供用户使用。
从上塔下部，抽取氩镏份气进入粗氩塔I，与从粗氩塔II经循环液氩泵输送来的粗液氩传热传质后，进入粗氩塔II，粗氩塔II冷源为经过冷器过冷后的液空，在粗氩塔II中，氩镏份气经传热传质后，脱去氧组份，然后进入纯氩塔，纯氩塔顶部及底部分别设置冷凝器和蒸发器，冷、热源分别为液氮和氮气，粗氩在纯氩塔中经过精镏，在纯氩冷凝器底部得到液态纯氩。

Claims (7)

1、一种中小型多工况节能型空分设备，其特征是：包括空气过滤器、空气压缩机、空气预冷***、空气纯化器、分镏塔***、增压透平膨胀机、氧气压缩机、仪控***、电控***；各***依次通过管道、阀门，采用法兰或焊接结构联接在一起，形成一套完整的空分设备。
2、根据权利要求1所述的空分设备，其特征是：所述的空气过滤器为自洁式空气过滤器，其清灰结构部件为无运动部件的脉冲喷吹型部件。
3、根据权利要求1所述的空分设备，其特征是：所述的空气压缩机为离心式空气压缩机。
4、根据权利要求1所述的空分设备，其特征是：所述的空气预冷***包括半封闭活塞式制冷压缩机、冷凝器、蒸发器，热气旁通阀，依次通过管道、阀门，采用法兰或焊接联接在一起形成空气预冷***。
5、根据权利要求1所述的空分设备，其特征是：所述的空气纯化器包括吸附筒、电加热器、放空消音器、仪表、电控***，依次通过管道、阀门，采用法兰或焊接结构联接在一起，形成空气净化***。。
6、根据权利要求1所述的空分设备，其特征是：所述的分镏塔冷箱***包括上下塔、主换热器、过冷器、冷凝蒸发器、粗氩塔、粗氩冷凝器、纯氩塔、纯氩蒸发器、纯氩冷凝器、循环液氩泵，依次通过管道、阀门，采用法兰或焊接结构按流程图组合在一起，装在保冷箱，形成分镏塔***。
7、根据权利要求1所述的空分设备，其特征是：所述的增压透平膨胀机直接装在冷箱内；或装在单独的小冷箱内，通过保温的过桥与冷箱连接。
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102767542A (zh) * 2012-07-23 2012-11-07 江苏申久化纤有限公司 一种大气量的离心空压机
CN104208980A (zh) * 2014-08-22 2014-12-17 中国华能集团清洁能源技术研究院有限公司 一种转轮空分纯化装置及方法
CN106744697A (zh) * 2017-01-17 2017-05-31 孔祥旭 一种超节能空分制氧装置
EP3438586A1 (fr) * 2017-08-03 2019-02-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil et procédé de séparation d'air par distillation cryogénique
FR3069914A1 (fr) * 2017-08-03 2019-02-08 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil et procede de separation d'air par distillation cryogenique
FR3069915A1 (fr) * 2017-08-03 2019-02-08 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil et procede de separation d'air par distillation cryogenique
WO2021204424A3 (de) * 2020-04-09 2021-12-02 Linde Gmbh Verfahren zur tieftemperaturzerlegung von luft, luftzerlegungsanlage und verbund aus wenigstens zwei luftzerlegungsanlagen
FR3118145A1 (fr) * 2020-12-23 2022-06-24 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de redémarrage d’un appareil de séparation d’air

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102767542A (zh) * 2012-07-23 2012-11-07 江苏申久化纤有限公司 一种大气量的离心空压机
CN104208980A (zh) * 2014-08-22 2014-12-17 中国华能集团清洁能源技术研究院有限公司 一种转轮空分纯化装置及方法
CN106744697A (zh) * 2017-01-17 2017-05-31 孔祥旭 一种超节能空分制氧装置
EP3438586A1 (fr) * 2017-08-03 2019-02-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil et procédé de séparation d'air par distillation cryogénique
EP3438584A1 (fr) * 2017-08-03 2019-02-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé et appareil de séparation d'air par distillation cryogénique
FR3069914A1 (fr) * 2017-08-03 2019-02-08 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil et procede de separation d'air par distillation cryogenique
FR3069915A1 (fr) * 2017-08-03 2019-02-08 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil et procede de separation d'air par distillation cryogenique
US10794630B2 (en) 2017-08-03 2020-10-06 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and device for separating air by cryogenic distillation
US10866024B2 (en) 2017-08-03 2020-12-15 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device and method for separating air by cryogenic distillation
WO2021204424A3 (de) * 2020-04-09 2021-12-02 Linde Gmbh Verfahren zur tieftemperaturzerlegung von luft, luftzerlegungsanlage und verbund aus wenigstens zwei luftzerlegungsanlagen
FR3118145A1 (fr) * 2020-12-23 2022-06-24 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de redémarrage d’un appareil de séparation d’air
WO2022136088A1 (fr) * 2020-12-23 2022-06-30 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de redémarrage d'un appareil de séparation d'air

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