CN104406039A - Improved recycling system and technology for emptying nitrogen from liquid nitrogen tank - Google Patents
Improved recycling system and technology for emptying nitrogen from liquid nitrogen tank Download PDFInfo
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- CN104406039A CN104406039A CN201410685948.5A CN201410685948A CN104406039A CN 104406039 A CN104406039 A CN 104406039A CN 201410685948 A CN201410685948 A CN 201410685948A CN 104406039 A CN104406039 A CN 104406039A
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Abstract
The invention relates to an improved recycling system and technology for emptying nitrogen from a liquid nitrogen tank. A first liquid nitrogen tank and a second liquid nitrogen tank are connected to a tank body through pipelines respectively; the other ends of the pipelines are respectively connected with a first liquid nitrogen tank pressure release sluice valve and a second liquid nitrogen tank pressure release sluice valve; the rear parts of the first liquid nitrogen tank pressure release sluice valve and the second liquid nitrogen tank pressure release sluice valve are respectively connected with a secondary first liquid nitrogen tank sluice valve and a secondary second liquid nitrogen tank sluice valve; the secondary first liquid nitrogen tank sluice valve and the secondary second liquid nitrogen tank sluice valve are connected together through a secondary sluice valve connection pipe; one sides of the tank bodies of the first liquid nitrogen tank and the second liquid nitrogen tank are connected through an outlet pipeline, and an outlet valve is arranged at a position close to each tank body. By the additional arrangement of the valves, nitrogen can be recycled during emptying pressure release, so that injury to a human body due to low-temperature nitrogen during nitrogen emptying pressure release is avoided; meanwhile, an original quickly opened and closed valve is improved, and a positioning device is additionally arranged, so that an adjustment function is realized; the openness of the valve can be adjusted in a central control room through a control system, and the safe production is guaranteed.
Description
Technical field
The present invention relates to a kind of nitrogen recycling system and method, specifically relate to a kind of reclaiming system and technique of liquid nitrogen container nitrogen leak of improvement, belong to chemical field.
Background technique
Because liquid nitrogen container can only be heat insulation, can not be adiabatic, be 0.35% according to GB (GB18442) specified value evaporating loss every day amount; Then monthly loss liquid nitrogen all wanted by single storage tank, supercharging in 1 day is about 0.055MPa, because liquid nitrogen is by thermal evaporation in the normal storage process of liquid nitrogen container, liquid nitrogen container pressure raises, for ensureing the not take-off of liquid nitrogen tank deck safety valve, need artificially manually to bleed off pressure, the low temperature nitrogen after bleeding off pressure is directly emptying at present, so not only waste nitrogen, and in discharge process, a large amount of low temperature nitrogen also easily damages to human body.
Summary of the invention
For overcoming above-mentioned difficulties, a kind of reclaiming system and technique of liquid nitrogen container nitrogen leak of improvement are the object of this invention is to provide, can reclaim during by increasing valve and ensureing nitrogen blowdown pressure letdown, save energy and reduce the cost, when avoiding liquid nitrogen blowdown pressure letdown, low temperature nitrogen is to the injury of human body.
To achieve these goals, the technical solution adopted in the present invention is: the reclaiming system of the liquid nitrogen container nitrogen leak of improvement, is characterized in that: comprise the first liquid nitrogen container, the second liquid nitrogen container, 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 nitrogen container secondary gate valve, secondary gate valve connecting tube, outlet line, outlet valve, safety valve, adjustment normal valve, liquid nitrogen vaporizer, emptying goes out spoken parts in an opera steel pipeline, liquid nitrogen container pressure gauge, liquid nitrogen vaporizer pressure gauge, described adjustment normal valve increases positioning work piece for opening on quick-closing valve door in former speed, first liquid nitrogen container, second liquid nitrogen container is connected in tank body respectively by pipeline, the pipeline the other end bleeds off pressure gate valve with the first liquid nitrogen container respectively, second liquid nitrogen container bleeds off pressure gate valve and is connected, first liquid nitrogen container bleeds off pressure gate valve, second liquid nitrogen container connects the first liquid nitrogen container secondary gate valve after bleeding off pressure gate valve respectively separately, second liquid nitrogen container secondary gate valve, linked together by secondary gate valve connecting tube between first liquid nitrogen container secondary gate valve and the second liquid nitrogen container secondary gate valve, be connected by outlet line in the first liquid nitrogen container and the second each tank body side of liquid nitrogen container and be respectively provided with outlet valve near tank body position, outlet line is connected to liquid nitrogen vaporizer by pipeline, the pipeline of liquid nitrogen vaporizer front end is provided with regulate normal valve and on pipeline, establish emptying to go out spoken parts in an opera steel pipeline and is connected with gate valve connecting tube, safety valve is provided with in adjustment normal valve front end, draw pipeline on liquid nitrogen vaporizer top and be connected to low-pressure nitrogen pipe network, the first described liquid nitrogen container, second liquid nitrogen container is respectively by pipeline Bonding pressure table, the pipeline causing low-pressure nitrogen pipe network in liquid nitrogen vaporizer upper end is provided with pressure gauge, monitoring liquid nitrogen vaporizer air pressure.
Described secondary gate valve connecting tube is low temperature resistant white steel pipeline, and the first described liquid nitrogen container secondary gate valve, the second liquid nitrogen container secondary gate valve are low temperature resistant white steel valve.
Described outlet valve is 2, and described liquid nitrogen container pressure gauge is 2.
The technique of the liquid nitrogen container nitrogen leak of described improvement is:
Under normality, 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 nitrogen container secondary gate valve, outlet valve is set to automatically, described outlet valve design of pressure lower than safety valve jumping up pressure, higher than low-pressure nitrogen ductwork pressure; In liquid nitrogen container, when gases are heated, they expand, pressure increase, the pressure of the first liquid nitrogen container, the second liquid nitrogen container is controlled by respective pressure gauge teletransmission, when the first liquid nitrogen container or the second liquid nitrogen container pressure reach safety valve jumping up pressure alarm value, open adjustment normal valve, liquid nitrogen container internal pressure is gone out spoken parts in an opera steel pipeline by secondary gate valve connecting tube, emptying, regulate normal valve to enter liquid nitrogen vaporizer, finally low-pressure nitrogen is incorporated to low-pressure nitrogen pipe network, ensure that nitrogen is without discharge, all reclaims, energy-saving and cost-reducing.
Described safety valve jumping up pressure alarm value is 0.5Mpa.
The invention has the beneficial effects as follows: can reclaim during by increasing valve and ensureing nitrogen blowdown pressure letdown, save energy and reduce the cost, when avoiding liquid nitrogen blowdown pressure letdown, low temperature nitrogen is to the injury of human body; Former speed is opened quick-closing valve door to carry out improvement and increase positioning device simultaneously, possess regulatory function, being convenient to just can the aperture of regulating valve by control system at central control chamber, ensures safety in production.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, the 1, first liquid nitrogen container, 2, the second liquid nitrogen container, 3, the first liquid nitrogen container bleed off pressure gate valve, 4, the second liquid nitrogen container bleed off pressure gate valve, 5, the first liquid nitrogen container secondary gate valve, 6, the second liquid nitrogen container secondary gate valve, 7, secondary gate valve connecting tube, 8, outlet line, 9, outlet valve, 10, safety valve, 11, regulate normal valve, 12, liquid nitrogen vaporizer, 13, emptying goes out spoken parts in an opera steel pipeline 14, liquid nitrogen vaporizer pressure gauge.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
Fig. 1 shows reclaiming system and the process schematic representation of the liquid nitrogen container nitrogen leak of improvement, and its reclaiming system comprises the first liquid nitrogen container 1, second liquid nitrogen container 2, first liquid nitrogen container and bleeds off pressure that gate valve 3, second liquid nitrogen container bleeds off pressure gate valve 4, first liquid nitrogen container secondary gate valve 5, second liquid nitrogen container secondary gate valve 6, secondary gate valve connecting tube 7, outlet line 8, outlet valve 9, safety valve 10, regulates normal valve 11, liquid nitrogen vaporizer 12, emptying go out spoken parts in an opera steel pipeline 13, liquid nitrogen container pressure gauge, liquid nitrogen vaporizer pressure gauge 14, described adjustment normal valve 11 for increase positioning work piece on valve, first liquid nitrogen container 1, second liquid nitrogen container 2 is connected in tank body respectively by pipeline, the pipeline the other end bleeds off pressure gate valve 3 with the first liquid nitrogen container respectively, second liquid nitrogen container bleeds off pressure gate valve 4 and is connected, first liquid nitrogen container bleeds off pressure gate valve 3, second liquid nitrogen container connects the first liquid nitrogen container secondary gate valve 5 after bleeding off pressure gate valve 4 respectively separately, second liquid nitrogen container secondary gate valve 6, linked together by secondary gate valve connecting tube 7 between first liquid nitrogen container secondary gate valve 5 and the second liquid nitrogen container secondary gate valve 6, be connected by outlet line 8 in the first liquid nitrogen container 1 and the second each tank body side of liquid nitrogen container 2 and be provided with outlet valve 9 near tank body position, outlet line 8 is connected to liquid nitrogen vaporizer 12 by pipeline, the pipeline of liquid nitrogen vaporizer 12 front end is provided with regulate normal valve 11 and on pipeline, establish emptying to go out spoken parts in an opera steel pipeline 13 and is connected with gate valve connecting tube 7, safety valve 10 is provided with in adjustment normal valve 11 front end, draw pipeline on liquid nitrogen vaporizer 12 top and be connected to low-pressure nitrogen pipe network, the first described liquid nitrogen container 1, second liquid nitrogen container 2 connects liquid nitrogen pressure tank table respectively by pipeline, the pipeline causing low-pressure nitrogen pipe network in liquid nitrogen vaporizer 12 upper end is provided with liquid nitrogen vaporizer pressure gauge 14, monitoring liquid nitrogen vaporizer air pressure.
Described secondary gate valve connecting tube 7 is low temperature resistant white steel pipeline, and the first described liquid nitrogen container secondary gate valve 5, second liquid nitrogen container secondary gate valve 6 is low temperature resistant white steel valve.
Liquid nitrogen container nitrogen leak as above reclaims, and its concrete technology is:
In liquid nitrogen container, when gases are heated, they expand, pressure increase, when the first liquid nitrogen container 1 site pressure rising reaches liquid nitrogen container safety valve 10 release pressure (0.5Mpa) alarming value, confirm that the tank connected outlet valve 9 of the first liquid nitrogen is closed condition, open the first liquid nitrogen container and bleed off pressure gate valve 3, first liquid nitrogen container secondary gate valve 5, open and regulate normal valve 11, first liquid nitrogen container 1 internal pressure is bled off pressure gate valve 3 by the first liquid nitrogen container, first liquid nitrogen container secondary gate valve 5, secondary gate valve connecting tube 7, emptying goes out spoken parts in an opera steel pipeline 13 and enters liquid nitrogen vaporizer 12 and be incorporated to low-pressure nitrogen pipe network, ensure that nitrogen is without discharge, whole recovery, energy-saving and cost-reducing, when the second liquid nitrogen container 2 site pressure rising reaches liquid nitrogen container safety valve 10 release pressure (0.5Mpa) alarming value, confirm that the outlet valve 9 that the second liquid nitrogen container 2 connects is closed condition, open the second liquid nitrogen container and bleed off pressure gate valve 4, second liquid nitrogen container secondary gate valve 6, open and regulate normal valve 11, second liquid nitrogen container 2 internal pressure is bled off pressure gate valve 4, second liquid nitrogen container secondary gate valve 6 by the second liquid nitrogen container, secondary gate valve connecting tube 7, emptying goes out spoken parts in an opera steel pipeline 13 and enter liquid nitrogen vaporizer 12 and be incorporated to low-pressure nitrogen pipe network, ensure that nitrogen is without discharge, whole recovery, energy-saving and cost-reducing.
Claims (4)
1. the reclaiming system of liquid nitrogen container nitrogen leak improved, is characterized in that: comprise the first liquid nitrogen container, the second liquid nitrogen container, 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 nitrogen container secondary gate valve, secondary gate valve connecting tube, outlet line, outlet valve, safety valve, adjustment normal valve, liquid nitrogen vaporizer, emptying goes out spoken parts in an opera steel pipeline, liquid nitrogen container pressure gauge, liquid nitrogen vaporizer pressure gauge, described adjustment normal valve increases positioning work piece for opening on quick-closing valve door in former speed, first liquid nitrogen container, second liquid nitrogen container is connected in tank body respectively by pipeline, the pipeline the other end bleeds off pressure gate valve with the first liquid nitrogen container respectively, second liquid nitrogen container bleeds off pressure gate valve and is connected, first liquid nitrogen container bleeds off pressure gate valve, second liquid nitrogen container connects the first liquid nitrogen container secondary gate valve after bleeding off pressure gate valve respectively separately, second liquid nitrogen container secondary gate valve, linked together by secondary gate valve connecting tube between first liquid nitrogen container secondary gate valve and the second liquid nitrogen container secondary gate valve, be connected by outlet line in the first liquid nitrogen container and the second each tank body side of liquid nitrogen container and be respectively provided with outlet valve near tank body position, outlet line is connected to liquid nitrogen vaporizer by pipeline, the pipeline of liquid nitrogen vaporizer front end is provided with regulate normal valve and on pipeline, establish emptying to go out spoken parts in an opera steel pipeline and is connected with gate valve connecting tube, safety valve is provided with in adjustment normal valve front end, draw pipeline on liquid nitrogen vaporizer top and be connected to low-pressure nitrogen pipe network, the first described liquid nitrogen container, second liquid nitrogen container is respectively by pipeline Bonding pressure table, the pipeline causing low-pressure nitrogen pipe network in liquid nitrogen vaporizer upper end is provided with pressure gauge, monitoring liquid nitrogen vaporizer air pressure.
2. the reclaiming system of the liquid nitrogen container nitrogen leak of improvement according to claim 1, it is characterized in that described secondary gate valve connecting tube is low temperature resistant white steel pipeline, the first described liquid nitrogen container secondary gate valve, the second liquid nitrogen container secondary gate valve are low temperature resistant white steel valve.
3. the reclaiming system of the liquid nitrogen container nitrogen leak of improvement according to claim 1, it is characterized in that described outlet valve is 2, described liquid nitrogen container pressure gauge is 2.
4. the technique of the liquid nitrogen container nitrogen leak of the improvement described in, is characterized in that:
Under normality, 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 nitrogen container secondary gate valve, outlet valve is set to automatically, described outlet valve design of pressure lower than safety valve jumping up pressure, higher than low-pressure nitrogen ductwork pressure; In liquid nitrogen container, when gases are heated, they expand, pressure increase, the pressure of the first liquid nitrogen container, the second liquid nitrogen container is controlled by respective pressure gauge teletransmission, when the first liquid nitrogen container or the second liquid nitrogen container pressure reach safety valve jumping up pressure alarm value, open adjustment normal valve, liquid nitrogen container internal pressure is gone out spoken parts in an opera steel pipeline by secondary gate valve connecting tube, emptying, regulate normal valve to enter liquid nitrogen vaporizer, finally low-pressure nitrogen is incorporated to low-pressure nitrogen pipe network, ensure that nitrogen is without discharge, all reclaims, energy-saving and cost-reducing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410685948.5A CN104406039B (en) | 2014-11-26 | 2014-11-26 | Recovery system and the technique of improved liquid nitrogen container emptying nitrogen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410685948.5A CN104406039B (en) | 2014-11-26 | 2014-11-26 | Recovery system and the technique of improved liquid nitrogen container emptying nitrogen |
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| CN104406039A true CN104406039A (en) | 2015-03-11 |
| CN104406039B CN104406039B (en) | 2016-05-11 |
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| CN201410685948.5A Active CN104406039B (en) | 2014-11-26 | 2014-11-26 | Recovery system and the technique of improved liquid nitrogen container emptying nitrogen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117287621A (en) * | 2023-09-22 | 2023-12-26 | 安捷汇物联信息技术（苏州）有限公司 | Intelligent freezing liquefied gas tank car fills equipment and control system |
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| 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 |
| CN202725600U (en) * | 2012-08-07 | 2013-02-13 | 南京钢铁股份有限公司 | Low temperature ordinary pressure liquid nitrogen storage tank evaporated and diffused gas recovery unit |
| 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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2014
- 2014-11-26 CN CN201410685948.5A patent/CN104406039B/en active Active
Patent Citations (6)
| 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 |
| CN202725600U (en) * | 2012-08-07 | 2013-02-13 | 南京钢铁股份有限公司 | Low temperature ordinary pressure liquid nitrogen storage tank evaporated and diffused gas recovery unit |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117287621A (en) * | 2023-09-22 | 2023-12-26 | 安捷汇物联信息技术（苏州）有限公司 | Intelligent freezing liquefied gas tank car fills equipment and control system |
| CN117287621B (en) * | 2023-09-22 | 2024-05-14 | 安捷汇物联信息技术（苏州）有限公司 | Intelligent freezing liquefied gas tank car fills equipment and control system |
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| CN104406039B (en) | 2016-05-11 |
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