Combined ammonia compression refrigeration process and system

Abstract

The invention discloses a combined ammonia compression refrigeration technology and system. The problems that an existing ammonia compression refrigeration technology is high in energy consumption and production cost are solved. The system comprises a hot water buffering tank, a hot water circulation pump, a condenser and a cold water machine, all of which are connected in sequence. The hot water inlet of the cold water machine is connected with the condenser, the hot water outlet of the cold water machine is connected with the hot water buffering tank, and the cold water outlet of the cold water machine is connected with the cold water inlet of the ammonia condenser, the cold water outlet of the ammonia condenser, the cold water buffering tank, the cold water circulation pump and the cold water inlet of the cold water machine in sequence. The system is simple, waste heat is effectively recycled and serves as a heat source to refrigerate water, the gaseous ammonia at the outlet of an ammonia compressor is condensed into liquid ammonia, energy is saved, consumption is reduced, and production cost is reduced.

Description

technical field [0001] The invention relates to a refrigeration process and system, in particular to a combined ammonia compression refrigeration process and system. Background technique [0002] At present, in the coal chemical industry project, the cryogenic process of the gas purification device (that is, the cooling capacity user) requires a cooling capacity of -40°C. The traditional cooling capacity is provided by ammonia compression refrigeration. The ammonia compressor compresses the gaseous ammonia to 1.9MPag, and then The gaseous ammonia is condensed into liquid ammonia at about 40°C by circulating water cooling, and the liquid ammonia is sent to the cryogenic process after being cooled, and decompressed and flashed to provide cooling capacity for the cryogenic process, and the gaseous ammonia gasified again Go back to the ammonia compressor inlet. [0003] In addition, in coal-to-methanol, coal-to-ethylene glycol and other fields, there is a large amount of low-le...

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Problems solved by technology

[0003] In addition, in coal-to-methanol, coal-to-ethylene glycol and other fields, there is a large amount of low-level waste heat (below 150°C) that cannot be well utilized, and they are directly cooled by circulating cooling water, which consumes a lot of circulating water and wastes low-level heat energy.

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