Improved recycling system and technology for emptying nitrogen from liquid nitrogen tank

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 [0001] 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. Background technique [0002] Since the liquid nitrogen tank can only be insulated but not 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 b...

AI Technical Summary

Problems solved by technology

[0002] 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

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