CN110645770A - 一种液氩冷量回收方法 - Google Patents

一种液氩冷量回收方法 Download PDF

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CN110645770A
CN110645770A CN201910896241.1A CN201910896241A CN110645770A CN 110645770 A CN110645770 A CN 110645770A CN 201910896241 A CN201910896241 A CN 201910896241A CN 110645770 A CN110645770 A CN 110645770A
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nitrogen
pressure
liquid
heat exchanger
raw material
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张育哲
刘宾
刘景武
侯新刚
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Zhejiang Zhihai Chemical Equipment Engineering 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0015—Nitrogen
    • 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
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0221—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop
    • F25J1/0224—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop in combination with an internal quasi-closed refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • 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
    • F25J2210/58—Argon

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

一种液氩冷量回收方法,它包括常压、中压、低压三条不同压力的氮气、液氮过冷器、膨胀机、换热器、氩气增压机，其特征在于所述回收方法包括如下步骤：a.原料低压氮气(0.3 MpaG)进入膨胀机增压端增压至0.6MpaG，后进入换热器冷却至‑5C中抽进入膨胀机膨胀端，膨胀至0.025 MpaG后返流送入换热器，复热后送入常压氮气通道，本发明有效地提高生产效率,降低生产成本和投资成本。

Description

一种液氩冷量回收方法
技术领域
本发明涉及一种新型液氩冷量回收的流程方法,是一种能耗低、稳定性高的液氩冷量回收流程。
背景技术
随着不锈钢冶炼等行业的发展，氩气得到了更广泛的使用。越来越多的氩气使用方采购液氩后气化使用，其中存在着巨大的冷量浪费，为了回收液氩中的冷量，人们开始使用氮气和氩气换热，为了匹配氮气和氩气的压力，很多情况下不得不采用高压氮气，比如，氩气压力在2.5 MpaG时，氮气的压力就必须高于7.0 MpaG,这不仅仅对原料氮气的要求较高，同时，高压换热还导致制造难度大幅升高，换热换热温差大，使用中容易因为冷热应力大而拉伤换热器，导致泄漏。在实际使用中，经常发现高压氩冷量回收换热器使用3-6个月后就发生内漏，严重影响了氩冷量回收装置的长时间稳定使用，完全达不到原有设计目标和经济目标。
发明内容
本发明的目的在于提供一种低能耗低温差低压力的液氩冷量回收装置，它能够克服已有技术的不足,能在相同产品参数下降低液氩冷量回收装置的综合单位能耗,延长使用寿命,从而可有效地提高生产效率及经济效益。本发明的目的是通过如下技术方案来完成的：一种液氩冷量回收方法,它包括常压、中压、低压三条不同压力的氮气、液氮过冷器、膨胀机、换热器、氩气增压机，其特征在于所述回收方法包括如下步骤：
a.原料低压氮气(0.3 MpaG)进入膨胀机增压端增压至0.6MpaG，后进入换热器冷却至-5C中抽进入膨胀机膨胀端，膨胀至0.025 MpaG后返流送入换热器，复热后送入常压氮气通道。
b.原料中压氮气(2.4 MpaG)送入换热器和液氩换热，变为液氮后出主换热器送入液氮过冷器，过冷后分为两部分，大部分作为液氮产品送出，小部分作为液氮节流至0.03MpaG后作为过冷器的冷流体送入过冷器，被液氮复热后送入主换热器，换热后送入常压氮气管网。
c.液氩原料液通过液氩泵加压至0.9 MpaG后送入主换热器，复热后送入氩气增压机增压至所需压力送入管网。
本流程中，换热器的工作压力最高为中压氮气（2.4MpaG）,换热器中最大温差低于25C，有效地降低了换热器的制造难度、制造成本和使用难度，在这个温度范围内，换热器的使用寿命完全可以达到预期值，同时，较小的换热温差节约了冷量，产出的液氮单耗比原有高压换热流程低10%。总之，本流程能有效地提高生产效率,降低生产成本和投资成本。
附图说明：
图1是本发明流程示意图。
具体实施方式
下面将结合附图对本发明作详细的介绍：图1所述：一种液氩冷量回收方法,它包括常压、中压、低压三条不同压力的氮气、液氮过冷器、膨胀机、换热器、氩气增压机，其特征在于所述回收方法包括如下步骤：
a.原料低压氮气(0.3 MpaG)进入膨胀机增压端增压至0.6MpaG，后进入换热器冷却至-5C中抽进入膨胀机膨胀端，膨胀至0.025 MpaG后返流送入换热器，复热后送入常压氮气通道。
b.原料中压氮气(2.4 MpaG)送入换热器和液氩换热，变为液氮后出主换热器送入液氮过冷器，过冷后分为两部分，大部分作为液氮产品送出，小部分作为液氮节流至0.03MpaG后作为过冷器的冷流体送入过冷器，被液氮复热后送入主换热器，换热后送入常压氮气管网。
c.液氩原料液通过液氩泵加压至0.9 MpaG后送入主换热器，复热后送入氩气增压机增压至所需压力送入管网。
本流程液氩/氮气冷量回收的流程。为满足钢铁等冶炼企业所需要的2.0-3.0MpaG氩气，将液氩通过低温泵加压到0.9 MpaG后和1.1 MpaG的氮气换热，得到常温氩气通过增压机增压后送入氩气管网。同以往的氩冷量回收装置相比，新流程中换热器最大温差小，运行稳定，设备的安全稳定时间大大增加，并且换热器的平均对数温差更小，损失更低。因此，本发明可以非常明显的提高氩冷量回收的稳定性和效率，根据计算，通过新流程生产的液氮单耗比常用流程低10%以上。

Claims (1)

1.一种液氩冷量回收方法,它包括常压、中压、低压三条不同压力的氮气、液氮过冷器、膨胀机、换热器、氩气增压机，其特征在于所述回收方法包括如下步骤：
a.原料低压氮气0.3 MpaG进入膨胀机增压端增压至0.6MpaG，后进入换热器冷却至-5C中抽进入膨胀机膨胀端，膨胀至0.025 MpaG后返流送入换热器，复热后送入常压氮气通道;
b.原料中压氮气2.4 MpaG送入换热器和液氩换热，变为液氮后出主换热器送入液氮过冷器，过冷后分为两部分，大部分作为液氮产品送出，小部分作为液氮节流至0.03 MpaG后作为过冷器的冷流体送入过冷器，被液氮复热后送入主换热器，换热后送入常压氮气管网;
c.液氩原料液通过液氩泵加压至0.9 MpaG后送入主换热器，复热后送入氩气增压机增压至所需压力送入管网。
CN201910896241.1A 2019-09-22 2019-09-22 一种液氩冷量回收方法 Pending CN110645770A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114234556A (zh) * 2022-02-24 2022-03-25 杭州制氧机集团股份有限公司 一种回收液氧冷量的升压汽化装置及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104807286A (zh) * 2014-10-31 2015-07-29 刘继福 回收利用lng冷能的氮气液化系统
CN204594095U (zh) * 2015-04-13 2015-08-26 河南开元空分集团有限公司 综合利用氮气放空能量及液氩汽化冷能的装置
CN105972934A (zh) * 2016-07-13 2016-09-28 浙江智海化工设备工程有限公司 一种实现液氩冷量回收的液化装置
CN208983737U (zh) * 2018-08-22 2019-06-14 四川空分设备(集团)有限责任公司 一种增加空气分离系统液体产品能力的装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104807286A (zh) * 2014-10-31 2015-07-29 刘继福 回收利用lng冷能的氮气液化系统
CN204594095U (zh) * 2015-04-13 2015-08-26 河南开元空分集团有限公司 综合利用氮气放空能量及液氩汽化冷能的装置
CN105972934A (zh) * 2016-07-13 2016-09-28 浙江智海化工设备工程有限公司 一种实现液氩冷量回收的液化装置
CN208983737U (zh) * 2018-08-22 2019-06-14 四川空分设备(集团)有限责任公司 一种增加空气分离系统液体产品能力的装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114234556A (zh) * 2022-02-24 2022-03-25 杭州制氧机集团股份有限公司 一种回收液氧冷量的升压汽化装置及其使用方法
CN114234556B (zh) * 2022-02-24 2022-08-16 杭氧集团股份有限公司 一种回收液氧冷量的升压汽化装置及其使用方法

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