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CN104406039B - Recovery system and the technique of improved liquid nitrogen container emptying nitrogen - Google Patents

Recovery system and the technique of improved liquid nitrogen container emptying nitrogen Download PDF

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CN104406039B
CN104406039B CN201410685948.5A CN201410685948A CN104406039B CN 104406039 B CN104406039 B CN 104406039B CN 201410685948 A CN201410685948 A CN 201410685948A CN 104406039 B CN104406039 B CN 104406039B
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liquid nitrogen
nitrogen container
pressure
gate valve
valve
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CN104406039A (en
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陈国海
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Dalian Fujia Big Fossil Oil & Chemical Co ltd
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Dalian Fujia Dahua Petrochemical Co Ltd
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Abstract

The present invention relates to a kind of recovery system and technique of improved liquid nitrogen container emptying nitrogen, the first liquid nitrogen container, the second liquid nitrogen container is connected in tank body by pipeline respectively, the pipeline other end bleeds off pressure gate valve with the first liquid nitrogen container respectively, the second liquid nitrogen container bleeds off pressure gate valve and is connected, the first liquid nitrogen container bleeds off pressure gate valve, the second liquid nitrogen container connects respectively the first liquid nitrogen container secondary gate valve after bleeding off pressure gate valve separately, the second liquid nitrogen container secondary gate valve, between the first liquid nitrogen container secondary gate valve and the second liquid nitrogen container secondary gate valve, link together by secondary gate valve tube connector, be connected by outlet line with each tank body one side of the second liquid nitrogen container at the first liquid nitrogen container and be respectively provided with outlet valve near tank body position, can reclaim by increasing when valve ensures nitrogen emptying pressure release, the injury of low temperature nitrogen to human body while avoiding liquid nitrogen emptying pressure release, former speed is opened to quick-closing valve door simultaneously and is improved and increase positioner, possess regulatory function, be convenient to just can control valve by control system at Central Control Room aperture, ensure safety in production.

Description

改进的液氮罐放空氮气的回收系统及工艺Improved nitrogen recovery system and process for venting nitrogen from liquid nitrogen tanks

技术领域technical field

本发明涉及一种氮气回收系统及方法，具体是涉及一种改进的液氮罐放空氮气的回收系统及工艺，属于化工领域。The invention relates to a nitrogen recovery system and method, in particular to an improved nitrogen recovery system and process for venting nitrogen from a liquid nitrogen tank, and belongs to the field of chemical industry.

背景技术Background technique

由于液氮罐只能隔热，不能绝热，根据国标（GB18442）规定值每日蒸发损耗量为0.35%；则每月单个储罐都要损耗液氮，1天增压约为0.055MPa，液氮罐正常存贮过程中由于液氮受热蒸发，液氮罐压力升高，为保证液氮罐顶安全阀不起跳，需人为手动放压，放压后的低温氮气目前直接放空，这样不仅浪费氮气，且排放过程中大量低温氮气对人体也易造成伤害。Since the liquid nitrogen tank can only be insulated, not heat-insulated, according to the national standard (GB18442), the daily evaporation loss is 0.35%; a single storage tank will lose liquid nitrogen every month, and the pressurization in one day is about 0.055MPa. During the normal storage process of the nitrogen tank, due to the evaporation of liquid nitrogen by heat, the pressure of the liquid nitrogen tank increases. In order to ensure that the safety valve on the top of the liquid nitrogen tank does not jump, it is necessary to manually release the pressure. Nitrogen, and a large amount of low-temperature nitrogen during the discharge process is also easy to cause harm to the human body.

发明内容Contents of the invention

为克服上述困难，本发明的目的是提供了一种改进的液氮罐放空氮气的回收系统及工艺，通过增加阀门保证氮气放空泄压时能回收，节能降耗，避免液氮放空泄压时低温氮气对人体的伤害。In order to overcome the above-mentioned difficulties, the object of the present invention is to provide an improved recovery system and process for nitrogen gas in liquid nitrogen tanks, by adding valves to ensure that nitrogen gas can be recovered when it is vented and pressure relieved, saving energy and reducing consumption, and avoiding the process of liquid nitrogen venting and pressure relief. The harm of low temperature nitrogen to human body.

为了实现上述目的，本发明所采用的技术方案为：改进的液氮罐放空氮气的回收系统，其特征在于：包括第一液氮罐、第二液氮罐、第一液氮罐放压闸阀、第二液氮罐放压闸阀、第一液氮罐二次闸阀、第二液氮罐二次闸阀、二次闸阀连接管、出口管线、出口阀、安全阀、调节定位阀、液氮汽化器、放空出口白钢管线、液氮罐压力表、液氮汽化器压力表；所述的调节定位阀为在原速开速关阀门上增加定位器；第一液氮罐、第二液氮罐分别通过管线连接至罐体内，管线另一端分别与第一液氮罐放压闸阀、第二液氮罐放压闸阀相连，第一液氮罐放压闸阀、第二液氮罐放压闸阀后分别各自连接第一液氮罐二次闸阀、第二液氮罐二次闸阀，第一液氮罐二次闸阀与第二液氮罐二次闸阀之间通过二次闸阀连接管连接在一起，在第一液氮罐和第二液氮罐各罐体一侧通过出口管线连接并在靠近罐体位置各设有出口阀，在出口管线上通过管线连接至液氮汽化器，在液氮汽化器前端的管线上设有调节定位阀并且在管线上设放空出口白钢管线与闸阀连接管相连，在调节定位阀前端设有安全阀，在液氮汽化器顶端引出管线连接至低压氮气管网，所述的第一液氮罐、第二液氮罐分别通过管线连接压力表，在液氮汽化器上端引至低压氮气管网的管线上设有压力表，监控液氮汽化器气压。In order to achieve the above object, the technical solution adopted in the present invention is: an improved liquid nitrogen tank venting nitrogen recovery system, which is characterized in that it includes the first liquid nitrogen tank, the second liquid nitrogen tank, and the first liquid nitrogen tank release gate valve , second liquid nitrogen tank pressure release gate valve, first liquid nitrogen tank secondary gate valve, second liquid nitrogen tank secondary gate valve, secondary gate valve connecting pipe, outlet pipeline, outlet valve, safety valve, regulating positioning valve, liquid nitrogen vaporizer , empty the white steel pipe line at the outlet, the pressure gauge of the liquid nitrogen tank, and the pressure gauge of the liquid nitrogen vaporizer; The pipeline is connected to the tank, and the other end of the pipeline is respectively connected to the first liquid nitrogen tank pressure relief gate valve and the second liquid nitrogen tank pressure relief gate valve. After the first liquid nitrogen tank pressure relief gate valve and the second liquid nitrogen tank pressure relief gate valve, respectively Connect the secondary gate valve of the first liquid nitrogen tank and the secondary gate valve of the second liquid nitrogen tank. The secondary gate valve of the first liquid nitrogen tank and the secondary gate valve of the second liquid nitrogen tank are connected together through the connecting pipe of the secondary gate valve. The first liquid nitrogen tank and the second liquid nitrogen tank are connected by outlet pipelines on one side of each tank body and are provided with outlet valves near the tank body. The outlet pipelines are connected to the liquid nitrogen vaporizer through pipelines, and the pipeline at the front end of the liquid nitrogen vaporizer An adjustable positioning valve is provided on the pipeline, and a white steel pipe line for the vent outlet is connected to the connecting pipe of the gate valve on the pipeline. A safety valve is provided at the front end of the adjustable positioning valve, and the lead-out pipeline at the top of the liquid nitrogen vaporizer is connected to the low-pressure nitrogen pipe network. The first liquid nitrogen tank and the second liquid nitrogen tank are respectively connected to pressure gauges through pipelines, and a pressure gauge is installed on the pipeline leading from the upper end of the liquid nitrogen vaporizer to the low-pressure nitrogen pipe network to monitor the pressure of the liquid nitrogen vaporizer.

所述的二次闸阀连接管为耐低温白钢管线，所述的第一液氮罐二次闸阀、第二液氮罐二次闸阀为耐低温白钢阀门。The connecting pipe of the secondary gate valve is a low temperature resistant white steel pipeline, and the secondary gate valve of the first liquid nitrogen tank and the secondary gate valve of the second liquid nitrogen tank are low temperature resistant white steel valves.

所述的出口阀为2个，所述的液氮罐压力表为2个。There are two outlet valves, and two pressure gauges for the liquid nitrogen tank.

所述的改进的液氮罐放空氮气的工艺为：The process of venting nitrogen in the improved liquid nitrogen tank is:

常态下，第一液氮罐放压闸阀、第二液氮罐放压闸阀、第一液氮罐二次闸阀、第二液氮罐二次闸阀，将出口阀设置为自动，所述的出口阀压力值设定低于安全阀起跳压力，高于低压氮气管网压力；液氮罐内气体受热膨胀，压力上升，第一液氮罐、第二液氮罐的压力由各自的压力表远传控制，当第一液氮罐或第二液氮罐压力达到安全阀起跳压力报警值时，打开调节定位阀，将液氮罐内压力通过二次闸阀连接管、放空出口白钢管线、调节定位阀进入液氮汽化器，最后将低压氮气并入低压氮气管网，保证氮气无排放，全部回收，节能降耗。Under normal conditions, the first liquid nitrogen tank pressure release gate valve, the second liquid nitrogen tank pressure release gate valve, the first liquid nitrogen tank secondary gate valve, the second liquid nitrogen tank secondary gate valve, set the outlet valve to automatic, and the outlet The valve pressure value is set lower than the take-off pressure of the safety valve and higher than the pressure of the low-pressure nitrogen pipe network; the gas in the liquid nitrogen tank is heated and expands, and the pressure rises. The pressure of the first liquid nitrogen tank and the second liquid nitrogen tank is controlled by their respective pressure gauges Transmission control, when the pressure of the first liquid nitrogen tank or the second liquid nitrogen tank reaches the safety valve take-off pressure alarm value, open the adjustment positioning valve, let the pressure in the liquid nitrogen tank pass through the connecting pipe of the secondary gate valve, vent the white steel pipe line at the outlet, and adjust The positioning valve enters the liquid nitrogen vaporizer, and finally the low-pressure nitrogen is merged into the low-pressure nitrogen pipe network to ensure that there is no nitrogen discharge, and all the nitrogen is recycled, saving energy and reducing consumption.

所述的安全阀起跳压力报警值为0.5Mpa。The safety valve take-off pressure alarm value is 0.5Mpa.

本发明的有益效果是：通过增加阀门保证氮气放空泄压时能回收，节能降耗，避免液氮放空泄压时低温氮气对人体的伤害；同时将原速开速关阀门进行改进增加定位装置，具备调节功能，便于在中控室通过控制系统就可以调节阀门的开度，确保安全生产。The beneficial effects of the present invention are: by adding valves, it is ensured that the nitrogen gas can be recycled when it is vented and released, saving energy and reducing consumption, and avoiding the harm of low-temperature nitrogen to the human body when the liquid nitrogen is vented and released; at the same time, the original speed opening and closing valve is improved and a positioning device is added , with adjustment function, it is convenient to adjust the opening of the valve through the control system in the central control room to ensure safe production.

附图说明Description of drawings

图1为本发明的结构示意图。Fig. 1 is a structural schematic diagram of the present invention.

图中，1、第一液氮罐、2、第二液氮罐、3、第一液氮罐放压闸阀、4、第二液氮罐放压闸阀、5、第一液氮罐二次闸阀、6、第二液氮罐二次闸阀、7、二次闸阀连接管、8、出口管线、9、出口阀、10、安全阀、11、调节定位阀、12、液氮汽化器、13、放空出口白钢管线14、液氮汽化器压力表。In the figure, 1, the first liquid nitrogen tank, 2, the second liquid nitrogen tank, 3, the first liquid nitrogen tank release gate valve, 4, the second liquid nitrogen tank release gate valve, 5, the first liquid nitrogen tank secondary Gate valve, 6, Secondary gate valve of the second liquid nitrogen tank, 7, Secondary gate valve connecting pipe, 8, Outlet pipeline, 9, Outlet valve, 10, Safety valve, 11, Regulating positioning valve, 12, Liquid nitrogen vaporizer, 13, Empty the outlet white steel pipe line 14 and the pressure gauge of the liquid nitrogen vaporizer.

具体实施方式detailed description

下面结合附图对本发明进行详细说明。The present invention will be described in detail below in conjunction with the accompanying drawings.

图1示出了改进的液氮罐放空氮气的回收系统及工艺示意图，其回收系统包括第一液氮罐1、第二液氮罐2、第一液氮罐放压闸阀3、第二液氮罐放压闸阀4、第一液氮罐二次闸阀5、第二液氮罐二次闸阀6、二次闸阀连接管7、出口管线8、出口阀9、安全阀10、调节定位阀11、液氮汽化器12、放空出口白钢管线13、液氮罐压力表、液氮汽化器压力表14；所述的调节定位阀11为在阀门上增加定位器；第一液氮罐1、第二液氮罐2分别通过管线连接至罐体内，管线另一端分别与第一液氮罐放压闸阀3、第二液氮罐放压闸阀4相连，第一液氮罐放压闸阀3、第二液氮罐放压闸阀4后分别各自连接第一液氮罐二次闸阀5、第二液氮罐二次闸阀6，第一液氮罐二次闸阀5与第二液氮罐二次闸阀6之间通过二次闸阀连接管7连接在一起，在第一液氮罐1和第二液氮罐2各罐体一侧通过出口管线8连接并在靠近罐体位置设有出口阀9，在出口管线8上通过管线连接至液氮汽化器12，在液氮汽化器12前端的管线上设有调节定位阀11并且在管线上设放空出口白钢管线13与闸阀连接管7相连，在调节定位阀11前端设有安全阀10，在液氮汽化器12顶端引出管线连接至低压氮气管网，所述的第一液氮罐1、第二液氮罐2分别通过管线连接液氮罐压力表，在液氮汽化器12上端引至低压氮气管网的管线上设有液氮汽化器压力表14，监控液氮汽化器气压。Fig. 1 shows the recovery system and process schematic diagram of the improved liquid nitrogen tank venting nitrogen, and its recovery system includes the first liquid nitrogen tank 1, the second liquid nitrogen tank 2, the first liquid nitrogen tank release gate valve 3, the second liquid nitrogen tank Nitrogen tank release gate valve 4, first liquid nitrogen tank secondary gate valve 5, second liquid nitrogen tank secondary gate valve 6, secondary gate valve connecting pipe 7, outlet pipeline 8, outlet valve 9, safety valve 10, regulating positioning valve 11 , liquid nitrogen vaporizer 12, empty outlet white steel pipe line 13, liquid nitrogen tank pressure gauge, liquid nitrogen vaporizer pressure gauge 14; Described adjustment positioning valve 11 is to increase positioner on valve; The first liquid nitrogen tank 1, the second The liquid nitrogen tanks 2 are respectively connected to the inside of the tank through pipelines, and the other ends of the pipelines are respectively connected to the first liquid nitrogen tank pressure release gate valve 3 and the second liquid nitrogen tank pressure release gate valve 4, and the first liquid nitrogen tank pressure release gate valve 3 and the second liquid nitrogen tank pressure release gate valve 4 are respectively connected to each other. The liquid nitrogen tank release gate valve 4 is respectively connected to the secondary gate valve 5 of the first liquid nitrogen tank, the secondary gate valve 6 of the second liquid nitrogen tank, the secondary gate valve 5 of the first liquid nitrogen tank and the secondary gate valve 6 of the second liquid nitrogen tank They are connected together by a secondary gate valve connecting pipe 7, connected by an outlet pipeline 8 on each tank side of the first liquid nitrogen tank 1 and the second liquid nitrogen tank 2 and are provided with an outlet valve 9 at a position close to the tank body. The outlet pipeline 8 is connected to the liquid nitrogen vaporizer 12 through the pipeline, and the adjustment positioning valve 11 is arranged on the pipeline at the front end of the liquid nitrogen vaporizer 12, and the white steel pipe line 13 of the vent outlet is connected to the gate valve connecting pipe 7 on the pipeline. The front end of 11 is provided with a safety valve 10, and the lead-out pipeline at the top of the liquid nitrogen vaporizer 12 is connected to the low-pressure nitrogen pipe network. The first liquid nitrogen tank 1 and the second liquid nitrogen tank 2 are respectively connected to the pressure gauge of the liquid nitrogen tank through pipelines. A liquid nitrogen vaporizer pressure gauge 14 is provided on the pipeline leading from the upper end of the liquid nitrogen vaporizer 12 to the low-pressure nitrogen pipe network to monitor the pressure of the liquid nitrogen vaporizer.

所述的二次闸阀连接管7为耐低温白钢管线，所述的第一液氮罐二次闸阀5、第二液氮罐二次闸阀6为耐低温白钢阀门。The secondary gate valve connecting pipe 7 is a low temperature resistant white steel pipeline, and the secondary gate valve 5 of the first liquid nitrogen tank and the secondary gate valve 6 of the second liquid nitrogen tank are low temperature resistant white steel valves.

如上所述的液氮罐放空氮气回收，其具体工艺是：As mentioned above, the liquid nitrogen tank is vented to recover nitrogen, and its specific process is:

液氮罐内气体受热膨胀，压力上升，当第一液氮罐1现场压力上升达到液氮罐安全阀10起跳压力（0.5Mpa）报警值时，确认第一液氮罐连接的出口阀9为关闭状态，打开第一液氮罐放压闸阀3、第一液氮罐二次闸阀5，打开调节定位阀11，将第一液氮罐1内压力通过第一液氮罐放压闸阀3、第一液氮罐二次闸阀5、二次闸阀连接管7、放空出口白钢管线13进入液氮汽化器12并入低压氮气管网，保证氮气无排放，全部回收，节能降耗；当第二液氮罐2现场压力上升达到液氮罐安全阀10起跳压力（0.5Mpa）报警值时，确认第二液氮罐2连接的出口阀9为关闭状态，打开第二液氮罐放压闸阀4、第二液氮罐二次闸阀6，打开调节定位阀11，将第二液氮罐2内压力通过第二液氮罐放压闸阀4、第二液氮罐二次闸阀6、二次闸阀连接管7、放空出口白钢管线13进入液氮汽化器12并入低压氮气管网，保证氮气无排放，全部回收，节能降耗。The gas in the liquid nitrogen tank is heated and expands, and the pressure rises. When the on-site pressure of the first liquid nitrogen tank 1 rises to the alarm value of the take-off pressure (0.5Mpa) of the safety valve 10 of the liquid nitrogen tank, confirm that the outlet valve 9 connected to the first liquid nitrogen tank is Closed state, open the first liquid nitrogen tank pressure release gate valve 3, the first liquid nitrogen tank secondary gate valve 5, open the adjustment positioning valve 11, and pass the pressure in the first liquid nitrogen tank 1 through the first liquid nitrogen tank pressure release gate valve 3, The secondary gate valve 5 of the first liquid nitrogen tank, the connecting pipe 7 of the secondary gate valve, and the white steel pipe line 13 at the vent outlet enter the liquid nitrogen vaporizer 12 and merge into the low-pressure nitrogen pipe network to ensure that there is no nitrogen discharge, all of which are recycled, and save energy and reduce consumption; when the second When the on-site pressure of the liquid nitrogen tank 2 rises to the alarm value of the take-off pressure (0.5Mpa) of the safety valve 10 of the liquid nitrogen tank, confirm that the outlet valve 9 connected to the second liquid nitrogen tank 2 is closed, and open the pressure release gate valve 4 of the second liquid nitrogen tank , The secondary gate valve 6 of the second liquid nitrogen tank, open the adjustment positioning valve 11, and pass the internal pressure of the second liquid nitrogen tank 2 through the second liquid nitrogen tank release gate valve 4, the second liquid nitrogen tank secondary gate valve 6, the secondary gate valve The connecting pipe 7 and the white steel pipe line 13 at the vent outlet enter the liquid nitrogen vaporizer 12 and merge into the low-pressure nitrogen pipe network to ensure that there is no nitrogen discharge and all are recycled, saving energy and reducing consumption.

Claims (4)

1. the recovery system of improved liquid nitrogen container emptying nitrogen, is characterized in that: comprise the first liquid nitrogen container, the second liquid nitrogen container,One liquid nitrogen container bleeds off pressure gate valve, the second liquid nitrogen container bleeds off pressure gate valve, the first liquid nitrogen container secondary gate valve, the second liquid nitrogen container secondary gate valve, twoInferior gate valve tube connector, outlet line, outlet valve, safety valve, adjusting normal valve, liquid nitrogen vaporizer, emptying go out spoken parts in an opera steel pipeline, liquidNitrogen pressure tank table, liquid nitrogen vaporizer Pressure gauge; Described adjusting normal valve is for opening and increase locator on quick-closing valve door in former speed; TheOne liquid nitrogen container, the second liquid nitrogen container are connected in tank body by pipeline respectively, and the pipeline other end bleeds off pressure lock with the first liquid nitrogen container respectivelyValve, the second liquid nitrogen container bleed off pressure gate valve and are connected, and the first liquid nitrogen container bleeds off pressure gate valve, the second liquid nitrogen container connects respectively after bleeding off pressure gate valve separatelyThe first liquid nitrogen container secondary gate valve, the second liquid nitrogen container secondary gate valve, the first liquid nitrogen container secondary gate valve and the second liquid nitrogen container secondary gate valveBetween link together by secondary gate valve tube connector, pass through outlet at the first liquid nitrogen container and each tank body one side of the second liquid nitrogen containerLine connects and being respectively provided with outlet valve near tank body position, is connected to liquid nitrogen vaporizer, at liquid on outlet line by pipelineThe pipeline of nitrogen vaporizer front end is provided with to regulate normal valve and on pipeline, establish emptying and goes out spoken parts in an opera steel pipeline and gate valve tube connectorBe connected, regulating normal valve front end to be provided with safety valve, draw pipeline on liquid nitrogen vaporizer top and be connected to low-pressure nitrogen pipe network, instituteThe first liquid nitrogen container, the second liquid nitrogen container stated connect liquid nitrogen pressure tank table by pipeline respectively, cause low in liquid nitrogen vaporizer upper endPress the pipeline of nitrogen pipe network to be provided with liquid nitrogen vaporizer Pressure gauge, monitoring liquid nitrogen vaporizer air pressure.
2. the recovery system of improved liquid nitrogen container emptying nitrogen according to claim 1, is characterized in that described secondaryGate valve tube connector is low temperature resistant white steel pipeline, and described the first liquid nitrogen container secondary gate valve, the second liquid nitrogen container secondary gate valve are resistance to lowWen Baigang valve.
3. the recovery system of improved liquid nitrogen container emptying nitrogen according to claim 1, is characterized in that described outletValve is 2, and described liquid nitrogen container Pressure gauge is 2.
4. the technique of improved liquid nitrogen container emptying nitrogen, is characterized in that:
Under normality, the first liquid nitrogen container bleeds off pressure gate valve, the second liquid nitrogen container bleeds off pressure gate valve, the first liquid nitrogen container secondary gate valve, the second liquid nitrogenTank secondary gate valve, outlet valve is set to automatically, and described outlet valve design of pressure is lower than safety valve jumping up pressure, higher than lowPress nitrogen ductwork pressure; When gases are heated, they expand in liquid nitrogen container, pressure rise, and the pressure of the first liquid nitrogen container, the second liquid nitrogen container is by respectivelyFrom Pressure gauge teletransmission control, in the time that the first liquid nitrogen container or the second liquid nitrogen container pressure reach safety valve jumping up pressure alarm value, beatDrive adjusting normal valve, liquid nitrogen container internal pressure is gone out to spoken parts in an opera steel pipeline, regulated normal valve to enter by secondary gate valve tube connector, emptyingLiquid nitrogen vaporizer, is finally incorporated to low-pressure nitrogen low-pressure nitrogen pipe network, ensures that nitrogen, without discharge, all reclaims, energy-saving and cost-reducing.
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CN108087721A (en) * 2017-11-17 2018-05-29 深圳市燃气集团股份有限公司 A kind of nitrogen recycling system and its recovery method
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CN202852420U (en) * 2012-10-12 2013-04-03 甘肃中集华骏车辆有限公司 Pressure release device of liquid carbon dioxide storage tank
CN203517309U (en) * 2013-09-24 2014-04-02 灵宝鸿宇电子有限责任公司 Recovery device for exhausted gas of liquid nitrogen container

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708831A (en) * 1953-04-09 1955-05-24 Air Reduction Separation of air
EP0591045A1 (en) * 1992-10-02 1994-04-06 Intertechnique Method and installation for filling a container with liquid air
EP0617247A1 (en) * 1993-03-26 1994-09-28 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Cryogenic liquid recycling device and its application in a product freezing apparatus
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CN202852420U (en) * 2012-10-12 2013-04-03 甘肃中集华骏车辆有限公司 Pressure release device of liquid carbon dioxide storage tank
CN203517309U (en) * 2013-09-24 2014-04-02 灵宝鸿宇电子有限责任公司 Recovery device for exhausted gas of liquid nitrogen container

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