Air separator by utilizing cold energy of liquefied natural gas

Abstract

An air separator using the cold energy generated by liquefying natural gas to prepare liquefied oxygen, liquefied nitrogen and liquefied argon is based on existing air separator, and features that the multi-stage circulating nitrogen compressors, LNG heat exchanger and circulated nitrogen heat exchanger are additionally used to form a combined refrigerating system, and an air cooling system is also used.

Description

Technical field: [0001] The invention relates to a liquefied natural gas cold energy utilization and an air separation device. Background technique: [0002] The air separation device is a device that uses air as a raw material to produce oxygen, nitrogen, argon and their liquids by liquefying the air and separating it according to the boiling points of oxygen, nitrogen, argon, etc. Liquefied air usually uses the Linde cycle or other improved cycles. In layman's terms: first compress the air to high pressure, use cooling water to cool the compressed air to normal temperature, let the high-pressure air throttling or expand to produce low temperature, and through the heat recovery The heat exchanger cools the high pressure air with the return flow of cold air it generates, so the high pressure air is either throttled at a lower temperature or expanded to a lower temperature, and the cycle continues until the air is liquefied. After the air is liquefied, according to the diffe...

AI Technical Summary

Problems solved by technology

And cold energy is a kind of very precious energy, with seawater heating method, just make the precious cold energy of liquefied natural gas be wasted in vain

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