Low-temperature liquid storage tank cover subsystem and low-temperature liquid storage tank

Abstract

The invention relates to a low-temperature liquid storage tank cover subsystem and a low-temperature liquid storage tank, wherein the cover subsystem arranged on the low-temperature liquid storage tank includes a storage tank cover and a pulse tube refrigerator; the pulse tube refrigerator is arranged on the storage tank cover and includes a low-temperature part and a room-temperature part; the low-temperature part includes a cooler, a heat regenerator, a cold energy heat exchanger and a pulse tube which are connected in order; the cooler and the pulse tube are connected with the room-temperature part; the room-temperature part compresses gas to generate a pressure wave, the gas is expanded at the bottom of the pulse tube for refrigeration, the expansion work is recovered by an expansion work recovery device of the room-temperature part, steam is condensed into a liquid on the cold energy heat exchanger, and the liquid flows back to the low-temperature liquid storage tank. Compared with the prior art, the pulse tube refrigerator is mounted in the low-temperature liquid storage tank cover subsystem and is equipped with the expansion work recovery device, and the efficiency is improved, so that recondensed evaporation gas is profitable, and the cover subsystem can be applied in the widely-used low-temperature liquid storage tank.

Description

technical field [0001] The invention relates to a cryogenic device, in particular to a cryogenic liquid storage tank cover system and a cryogenic liquid storage tank. Background technique [0002] Cryogenic liquid storage tanks are used to store cryogenic liquids, such as liquid helium, liquid hydrogen, liquid nitrogen, liquefied natural gas and other cryogenic liquids. Due to heat leakage, a part of the gas is always evaporated. In order to reduce evaporation, the evaporated gas can be recondensed with a cryogenic refrigerator. The early refrigerators used GM refrigerators, whose refrigeration efficiency was very low, and were rarely used except for liquid helium storage tanks. Compared with the GM refrigerator, the cooling efficiency of the newly developed pulse tube refrigerator has been greatly improved, but the efficiency is still too low. The gas released due to evaporation is still small compared to the electricity cost of a pulse tube refrigerator. But the evapor...

AI Technical Summary

Problems solved by technology

But the evaporated gas is a loss after all

At the same time, there are a large number of cryogenic liquid storage tanks in use. It is also a very troublesome thing to install a refrigerator, because it involves transformation problems. Even if there is a refrigerator with high efficiency, it is very troublesome to install

Therefore, most cryogenic liquid storage tanks, such as liquid nitrogen, liquid argon or liquid oxygen storage tanks, can only vent the evaporated steam

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