A backflushing device suitable for plate-fin heat exchangers in air separation cold boxes

By designing a backflushing device suitable for plate-fin heat exchangers in air separation cold boxes, the problem of heat exchanger blockage was solved by using nitrogen pressurization and high-pressure air reverse purging, achieving rapid cleaning and energy saving, and improving the operational safety and economy of air separation units.

CN224455554UActive Publication Date: 2026-07-03XIN XIANG ZHONG XIN HUA GONG YOU XIAN ZE REN GONG SI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Utility models(China)
Current Assignee / Owner
XIN XIANG ZHONG XIN HUA GONG YOU XIAN ZE REN GONG SI
Filing Date
2025-08-01
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

After long-term operation, plate-fin heat exchangers in air separation units tend to accumulate solid CO2 particles, molecular sieve dust, and mechanical impurities, leading to increased resistance and reduced gas flow into the tower. Existing technologies are unable to completely clean them, affecting the safety and economy of the unit.

Method used

The backflush assembly designed for low-pressure and high-pressure plate heat exchangers utilizes nitrogen pressurization and high-pressure air reverse purging, combined with suitable valves and flow regulation structures, to effectively clean the plate-fin heat exchanger and avoid sand scraping and channel cutting.

Benefits of technology

It enables rapid removal of impurities from heat exchangers, shortens start-up time, reduces cooling loss, lowers energy consumption, and improves the operational safety and economy of air separation units.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses a backflush device suitable for plate-fin heat exchangers in air separation cold boxes, including low-pressure and high-pressure plate heat exchanger backflush assemblies. The low-pressure assembly includes a first purge vent valve after the molecular sieve and a nitrogen pressurization valve at the top of the lower tower (connected to the emergency nitrogen pipeline network); the high-pressure assembly includes a main pipeline control valve at the compressor outlet, a second purge vent valve after it, and a backflush inlet branch pipe with a root valve before the main pipeline control valve (connected to the pipeline before the high-pressure air outlet throttling valve of the heat exchanger); this device eliminates the need for cold box sand removal, removes impurities through reverse pressurization and purging, solves the blockage problem, shortens start-up time, reduces energy consumption, and improves the safety and economy of the air separation unit.
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