Multi-strand winding pipe type main back heating and heat exchange device for low-temperature liquid nitrogen

The present invention is mainly applied cryogenic liquid nitrogen and ammonia technical field relates to the low temperature of liquid nitrogen with a multi-stream heat exchanger primary loop spiral wound technology equipment, application -191.5 ℃, 1.8MPa H2, -193.4 ℃, 5.19MPa N2-H2 synthesis gas, -191.5 ℃, 0.18MPa N2-Ar-CO-CH4 cooled waste nitrogen 42 ℃, 5.9MPa N2 to -188 ℃, 5.6MPa LN2 and H2-N2-CO-Ar-CH4 from the cryogenic cooling of the methanol process purge gas to -188.2 ℃, 5.21MPa, i.e. application N2-H2 syngas washing, high pressure H2 and cold waste nitrogen stream of high pressure cooling regenerator N2, washed RECTISOL purge gas, cryogenic liquid to the wash column to provide washed cryogenic nitrogen purge gas temperature conditions; multi-stream heat exchanger spiral wound structure with three-step three low temperatures, high heat exchange efficiency, can be used to resolve 42 ℃ ~ -197 ℃ cryogenic liquid nitrogen is wound with more than three streams tube heat exchanger technical problems, improve low-temperature liquid nitrogen process efficiency cryogenic heat exchanger system back.