Nitrogen cycle refrigeration system for cryogenic separation plant

By constructing a complementary heat exchange network and a two-stage pressure regulation system for the nitrogen cycle refrigeration system, the problems of uneven cooling capacity distribution and unstable pressure control were solved, achieving rapid cooling and efficient cooling, and improving the process efficiency of the cryogenic separation unit.

CN224680970UActive Publication Date: 2026-08-25山东恒信新能源有限公司
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Patent Information

Application Number
CN202521963876.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-12
Publication Date
2026-08-25
Estimated Expiration
2035-09-12

AI Technical Summary

Technical Problem

In existing nitrogen cycle refrigeration systems, uneven distribution of cooling capacity, slow cooling rate, high compressor discharge temperature, and unstable pressure control affect equipment lifespan and cooling capacity recovery efficiency.

Method used

A four-stage nitrogen compressor is used to construct a complementary heat exchange network of plate heat exchangers and tubular heat exchangers. Combined with a two-stage pressure regulating system and liquid nitrogen-assisted cooling, a local circulating cooling path is formed to optimize the distribution of cooling capacity and pressure control.

Benefits of technology

This improves heat exchange efficiency, ensures that the top of the distillation column reaches low temperature conditions quickly, shortens the start-up cycle, and enhances cooling efficiency and equipment lifespan.

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Abstract

The utility model belongs to refrigeration technical field, specifically disclose a kind of nitrogen circulation refrigeration system for cryogenic separation device, including fractionating column, nitrogen compressor, plate heat exchanger and intake pipe;Raw gas is connected to fractionating column by intake pipe after passing plate heat exchanger, can carry out preliminary cooling to raw gas;The inside top of fractionating column is equipped with tubular heat exchanger, and the top of fractionating column is connected with first gas outlet pipe, and first gas outlet pipe is connected with second gas outlet pipe after passing plate heat exchanger, reheats and exports process gas;Tubular heat exchanger is connected by first pipeline and is connected to nitrogen compressor again by the internal pipeline of plate heat exchanger, and after passing nitrogen compressor, the high-pressure normal-temperature nitrogen gas generated by it is connected back to plate heat exchanger by third pipeline, and after preliminary cooling by plate heat exchanger, it is connected back to tubular heat exchanger by fourth pipeline to provide cold quantity, can realize the rapid cooling of fractionating column overhead, shorten driving cycle.
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