CN103277981B - 一种提高空分装置氮氧产品比例的装置及方法 - Google Patents
一种提高空分装置氮氧产品比例的装置及方法 Download PDFInfo
- Publication number
- CN103277981B CN103277981B CN201310237929.1A CN201310237929A CN103277981B CN 103277981 B CN103277981 B CN 103277981B CN 201310237929 A CN201310237929 A CN 201310237929A CN 103277981 B CN103277981 B CN 103277981B
- Authority
- CN
- China
- Prior art keywords
- nitrogen
- tower
- subcooler
- pipeline
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- F25J3/04406—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
- 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
- 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
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
- F25J3/04969—Retrofitting or revamping of an existing air fractionation unit
Landscapes
- 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
本发明涉及一种提高空分装置氮氧产品比例的装置及方法,它在现有空分装置基础上,且基本不增加能耗的情况下,使空分装置氮氧产品比例提高到2:1或满足用户对氮氧产品需求比例不断增长的需求。它包括主换热器,膨胀机,过冷器,主精馏塔,冷箱,所述主精馏塔设有下塔、冷凝蒸发器、上塔,取消辅塔的同时使上塔在原高度的基础上增加约30%,上塔直接与氮气管道相连接,氮气、污氮气分别利用原污氮气和氮气管路输送和热交换后出冷箱接入各自管道,节约了管道及换热设备改造所需费用。
Description
技术领域
本发明涉及一种提高空分装置氮氧产品比例的装置及方法。
背景技术
近年来,随着冶金行业高炉、转炉的大型化和富氧冶炼技术的推广应用,冶金企业对氧气、氮气的需求比例发生了较大的变化,主要表现为对氮气需求量的增长大于对氧气需求的增长,根据粗略统计,氮氧比需求有原来的1:1,提高到了1.2:1或更高。但原配套制取氧气、氮气的空分装置在设计时氮氧产品比例一般为1:1,且在投运后氧气、氮气产品的产量基本不会有大的改变。如果新建氮氧产品比例大于1:1的制氧设备替代原有设备,那么原有设备闲置造成了浪费;如果根据氮气缺口新建制氮设备,那么势必要造成生产成本的大幅提高。而目前尚无有效的改造方式,以满足目前氧氮比需求的变化。
众所周知,大气中氧气含量(体积上)占20.9%,氮气含量(体积上)占78.1%。空分装置氮氧产品比例为1:1时,污氮气产量则为57.2%,为氮气产量的2倍还要多,这就为对现有空分装置部分设备进行改造,氮气、污氮气气流通道的互换以提高氮氧产品比例提供了条件。
发明内容
本发明的目的就是为解决现有空分装置无法有效满足氧氮比变化,而又缺乏有效的改造方式的问题,提供一种提高空分装置氮氧产品比例的装置及方法,它在现有空分装置基础上,且基本不增加能耗的情况下,满足用户对氮氧产品需求比例不断增长的需求。
为实现上述目的,本发明采用如下技术方案:
一种提高空分装置氮氧产品比例的装置,包括主换热器,膨胀机,过冷器,主精馏塔,冷箱,所述主精馏塔仅设有下塔、冷凝蒸发器、上塔,取消辅塔的同时使上塔在原上塔高度的基础上增加约30%,上塔直接与氮气管道相连接,冷箱内的氮气、污氮气气流通道在与上塔连接处进行了互相切换,即氮气利用原污氮气管路进行热交换与输送,污氮气则利用原氮气管路进行热交换与输送,氮气、污氮气出冷箱后再切换至原管道。
经净化的压缩空气的一部分经过膨胀机增压膨胀,再经主换热器、过冷器降温后,进入主分馏塔之上塔参与精馏,另一部分直接经主换热器进入主分馏塔之下塔参与精馏;下塔底部液空经过冷器进入上塔中部参与精馏,下塔顶部氮气进入主精馏塔之冷凝蒸发器液化后,一部分回流至下塔,另一部分经过冷器进入上塔顶部参与精馏,不凝气直接排空;上塔底部抽出的氧气经过冷器、主换热器复热后出冷箱,污氮气仍由上塔中上部取出,但冷箱内气流通道与氮气气流通道进行切换,经过冷器、主换热器出冷箱后切换接入原污氮气管道,氮气则由等效塔板数不变的情况下增高了的上塔替代原有辅塔的顶部取出,冷箱内气流通道相应地与污氮气气流通道进行切换,经过冷器、主换热器出冷箱后切换接入原氮气管道。
一种采用提高空分装置氮氧产品比例装置的提高氮氧产品比例的方法,取消辅塔的同时使上塔在原上塔高度的基础上增加约30%,使上塔氮气取出量提高到原来的2倍以上;根据氮气取出量增加后污氮气量下降的实际情况,将氮气、污氮气自上塔取出处进行气流通道的相互切换,即氮气利用原污氮气管路进行热交换与输送,污氮气则利用原氮气管路进行热交换与输送,既充分利用了现有管道及换热设备,又节约了因氮气取出量增加后管道改造、过冷器及主换热器换热面积变化更换造成的费用增加,而在出冷箱后又相应地切换至原管道,使整个空分装置的氮氧产品比例由1:1提高到了2:1及以上。
本发明的有益效果是:在基本不增加运行成本的条件下,通过空分装置上塔的增高改造与氮气、污氮气气流通道的相互切换,实现了空分装置氮氧产品比例由1:1提高到2:1及以上,节约了新建空分装置资金占用和旧设备闲置造成的浪费。例如20000Nm3/h等级空分装置提高氮氧产品比例后,氮气产量由20000Nm3/h提高到60000Nm3/h,按供出利润0.01元/m3计算,全年可增加利润为:(60000-20000)×365×24×0.01=350.4万元。
附图说明
图1现有空分装置氧气氮气生产工艺流程图;
图2本发明空分装置氧气氮气生产工艺流程图;
图中1.增压透平膨胀机组,2.冷箱,3.主换热器,4.过冷器,5.下塔,6.主精馏塔,7.冷凝蒸发器,8.上塔,9.辅塔,10.氮气通道,11.污氮气通道。
具体实施方式
下面结合附图对本发明做进一步说明:
图1中,经净化的压缩空气一部分经增压透平膨胀机组1增压后进入冷箱2,经主换热器3初步降温后再经增压透平膨胀机组1膨胀降温,经主换热器3、过冷器4降温后直接送入主精馏塔6的上塔8(上塔8在原上塔高度基础上增高30%)的中上部参与精馏;另一部分直接经主换热器3降温后送入主精馏塔6的下塔5参与精馏。下塔底部取出的液空经过冷器4过冷后进入上塔8中部参与精馏;下塔上升气体进入主精馏塔6的冷凝蒸发器7液化后一部分回下塔,另一部分经过冷器4过冷后进入上塔8上部参与精馏,不凝气体直接放空。上塔8底部取出的氧气经过冷器4、主换热器3复热后出冷箱2;主精馏塔6的上塔8顶部取出的污氮气由污氮气通道11经过冷器4、主换热器3复热后出冷箱2;辅塔9顶部取出的氮气由氮气通道10经过冷器4、主换热器3复热后出冷箱2。
可以看出,在这种空分装置中,氮气由主精馏塔的辅塔顶部取出,辅塔直径远小于上塔造成流通面积大幅缩小,且过冷器、主换热器等氮气通道流通面积也是按氮氧比1:1设计,无法通过变负荷等一般的操作手段使氮气产量得到大幅度提高。
图2中,本方法中经净化的压缩空气一部分经增压透平膨胀机组1增压后进入冷箱2,经主换热器3初步降温后再经增压透平膨胀机组1膨胀降温,经主换热器3、过冷器4降温后直接送入主精馏塔6的上塔8的中上部参与精馏;另一部分直接经主换热器3降温后送入主精馏塔6的下塔5参与精馏。下塔底部取出的液空经过冷器4过冷后进入上塔8中部参与精馏;下塔上升气体进入主精馏塔6的冷凝蒸发器7液化后一部分回下塔,另一部分经过冷器4过冷后进入上塔8上部参与精馏,不凝气体直接放空。上塔8底部取出的氧气经过冷器4、主换热器3复热后出冷箱2;污氮气取出高度位置与原方法中上塔的高度位置相同,但由原氮气通道10经过冷器4、主换热器3复热后出冷箱2后再进入原污氮气管道;氮气由增高后的上塔8顶部取出,但由原污氮气通道11经过冷器4、主换热器3复热后出冷箱2后再进入原氮气管道。
举例进行说明:原设计氮氧产品比例为1:1的20000Nm3/h空分装置的上塔高度为30440mm,直径为2700mm,辅塔高度为4579mm,直径为1920mm。切除辅塔后,将上塔加高9150mm,使总高度达到39590mm,直径仍为2700mm,上塔增加的高度约为原高度的30.06%。上塔增高后污氮气抽口高度不变,氮气抽口相应增高9150mm,氮气、污氮气取出经过过冷器、主换热器复热后出塔,由于原空分装置内氮气、污氮气管道直径分别为φ508mm和φ813mm,在氧气取出量不变的情况下提高氮氧比例就是增加氮气取出量,要使流通阻力不增加就必须增加管道直径,鉴于氮气取出量增加后污氮气取出量相应减少的实际情况,在空分装置内自上塔氮气、污氮气抽口处进行气流通道切换,即氮气利用原污氮气管路进行热交换与输送,污氮气则利用原氮气管路进行热交换与输送,氮气、污氮气出冷箱后再切换至原管道,满足了氮氧比例提高后各介质流通阻力不变、不影响氮气、污氮气换热效率,节约了对管道及过冷器、主换热器进行改造或更换的费用。
Claims (2)
1.一种提高空分装置氮氧产品比例的装置,包括主换热器,膨胀机,过冷器,主精馏塔,冷箱,其特征是,所述主精馏塔仅设有下塔、冷凝蒸发器、上塔,取消辅塔的同时使上塔在原上塔高度的基础上增加30%;上塔直接与氮气管道相连接,冷箱内的氮气、污氮气气流通道在与上塔连接处进行了互相切换,即氮气利用原污氮气管路进行热交换与输送,污氮气则利用原氮气管路进行热交换与输送,氮气、污氮气出冷箱后再切换至原管道。
2.如权利要求1所述的提高空分装置氮氧产品比例的装置,其特征是,经净化的压缩空气的一部分经过膨胀机增压膨胀,再经主换热器、过冷器降温后,进入主分馏塔之上塔参与精馏,另一部分直接经主换热器进入主分馏塔之下塔参与精馏;下塔底部液空经过冷器进入上塔中部参与精馏,下塔顶部氮气进入主精馏塔之冷凝蒸发器液化后,一部分回流至下塔,另一部分经过冷器进入上塔顶部参与精馏,不凝气直接排空;上塔底部抽出的氧气经过冷器、主换热器复热后出冷箱,污氮气仍由上塔中上部取出后,利用原氮气管路经过冷器、主换热器复热并输送出冷箱后再接入原污氮气管道,氮气则由增高后的上塔最顶部取出,利用原污氮气管路经过过冷器、主换热器复热并输送出冷箱后再接入原氮气管道。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310237929.1A CN103277981B (zh) | 2013-06-14 | 2013-06-14 | 一种提高空分装置氮氧产品比例的装置及方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310237929.1A CN103277981B (zh) | 2013-06-14 | 2013-06-14 | 一种提高空分装置氮氧产品比例的装置及方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN103277981A CN103277981A (zh) | 2013-09-04 |
CN103277981B true CN103277981B (zh) | 2015-05-06 |
Family
ID=49060571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201310237929.1A Expired - Fee Related CN103277981B (zh) | 2013-06-14 | 2013-06-14 | 一种提高空分装置氮氧产品比例的装置及方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN103277981B (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3327394A2 (en) | 2016-11-25 | 2018-05-30 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process for increasing low pressure pure nitrogen production by revamping original apparatus for cryogenic air separation |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103776239B (zh) * | 2014-01-13 | 2016-03-30 | 浙江海天气体有限公司 | 多功能制氮装置 |
CN104034123B (zh) * | 2014-06-27 | 2016-05-18 | 莱芜钢铁集团有限公司 | 一种空气分离装置积液调纯一体化作业方法 |
CN104949471A (zh) * | 2015-05-14 | 2015-09-30 | 马钢(集团)控股有限公司 | 一种提高空分装置氮气产量的方法 |
CN109764639A (zh) * | 2018-12-29 | 2019-05-17 | 上海华林工业气体有限公司 | 一种hyco冷箱减少放空的***与方法 |
CN111268658B (zh) * | 2020-03-11 | 2024-03-22 | 苏州市兴鲁空分设备科技发展有限公司 | 氩尾气回收净化方法和*** |
CN114459205A (zh) * | 2022-02-22 | 2022-05-10 | 开封黄河空分集团有限公司 | 一种膨胀空气的冷却*** |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2750269Y (zh) * | 2004-10-28 | 2006-01-04 | 苏州市兴鲁空分设备科技发展有限公司 | 一种空气分离的装置 |
US20080223077A1 (en) * | 2007-03-13 | 2008-09-18 | Neil Mark Prosser | Air separation method |
CN201367351Y (zh) * | 2009-03-17 | 2009-12-23 | 四川空分设备(集团)有限责任公司 | 新型高纯氧制取装置 |
CN101886871B (zh) * | 2010-08-04 | 2012-08-08 | 四川空分设备(集团)有限责任公司 | 一种空气分离制取压力氧气的方法及装置 |
CN202119205U (zh) * | 2011-06-13 | 2012-01-18 | 开封空分集团有限公司 | 交替生产氮气和液氮的空气分离装置 |
US20130139547A1 (en) * | 2011-12-05 | 2013-06-06 | Henry Edward Howard | Air separation method and apparatus |
CN202599013U (zh) * | 2012-04-26 | 2012-12-12 | 上海启元空分技术发展股份有限公司 | 一种返流膨胀制冷生产带压低纯氧和高纯氮的装置 |
-
2013
- 2013-06-14 CN CN201310237929.1A patent/CN103277981B/zh not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3327394A2 (en) | 2016-11-25 | 2018-05-30 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process for increasing low pressure pure nitrogen production by revamping original apparatus for cryogenic air separation |
EP3327394A3 (en) * | 2016-11-25 | 2018-11-07 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process for increasing low pressure pure nitrogen production by revamping original apparatus for cryogenic air separation |
Also Published As
Publication number | Publication date |
---|---|
CN103277981A (zh) | 2013-09-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103277981B (zh) | 一种提高空分装置氮氧产品比例的装置及方法 | |
CN101886871B (zh) | 一种空气分离制取压力氧气的方法及装置 | |
CN201281522Y (zh) | 氧气自增压空分装置 | |
CN106949708A (zh) | 一种对原有低温空分装置进行改装用以提高低压纯氮气产量的方法 | |
CN203534056U (zh) | 一种提高空分装置氮氧产品比例的装置 | |
CN104833174B (zh) | 一种带压辅助氧塔低能耗生产带压低纯氧和高纯氧产品的装置及方法 | |
CN104677052B (zh) | 一种空分分馏塔***及利用该***制备低纯氧的工艺 | |
CN102445054A (zh) | 一种由空气分离制取氧气和氮气的工艺 | |
CN106440659A (zh) | 一种低能耗内压缩空分装置 | |
CN103759500A (zh) | 一种低能耗制高纯氮的方法及装置 | |
CN100400995C (zh) | 空气分离的方法和装置 | |
CN204923686U (zh) | 一种低纯度氧空气分离的装置 | |
CN104019629A (zh) | 一种可与接收站冷能供应相匹配的空气分离方法 | |
CN102141337B (zh) | 一种空气分离的方法 | |
CN203432208U (zh) | 超低压制取高纯氧气和氮气装置 | |
US20230034371A1 (en) | Energy-efficient process for preparing nitrogen and oxygen for glass melting furnace | |
CN100443838C (zh) | 一种返流膨胀空气分离的方法和装置 | |
CN105115244A (zh) | 一种低纯度氧空气分离的装置及方法 | |
CN105605419B (zh) | 空氮站冷能综合回收利用***及其回收利用方法 | |
CN203615679U (zh) | 一种单塔制氧装置 | |
CN103438663A (zh) | 超低压制取高纯氧气和氮气装置及工艺 | |
CN201694836U (zh) | 一种制氧机 | |
CN101464085B (zh) | 一种超低压单塔深冷空分工艺 | |
CN201413000Y (zh) | 新型空分装置 | |
CN111707054A (zh) | 空分冷能回收*** |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150506 Termination date: 20160614 |