A New Air Separator for Ammonia Refrigeration

Abstract

The invention discloses a novel ammonia refrigeration air separator which comprises a shell-and-tube heat exchanger. A lower tube pass of the shell-and-tube heat exchanger is connected with a cooling water inlet tube, an upper tube pass of the shell-and-tube heat exchanger is connected with a cooling water outlet tube, a gas inlet is formed in the top of a shell pass of the shell-and-tube heat exchanger, the bottom of the shell pass is communicated with the bottom of an inner barrel through a pipeline, a valve and an expansion valve, and the top of the inner barrel is communicated with the low-pressure end of an ammonia refrigeration system through a pipeline and a valve. An outer barrel is arranged outside the inner barrel, a sealed cavity is formed between the outer wall of the inner barrel and the inner wall of the outer barrel, and a fin plate is welded to the outer wall of the inner barrel, and is located in the sealed cavity. The lower middle portion of the shell pass of the shell-and-tube heat exchanger is communicated with the lower portion of the sealed cavity through a pipeline and a valve, and the upper portion of the sealed cavity is connected with an exhaust device. A cavity formed by the inner wall of the inner barrel is communicated with the sealed cavity through a pipeline and an expansion valve. The novel ammonia refrigeration air separator is good in heat exchange efficiency, air is removed thoroughly, the air can be exhausted automatically, the structure is simple, high practicality is achieved, and the prospect is wide.

Description

technical field [0001] The invention relates to a separator for removing air in an ammonia refrigeration device. Background technique [0002] Ammonia has excellent thermodynamic properties, and ammonia is generally used as a refrigerant in larger refrigeration systems. In the four-step cycle of compression, condensation, throttling, and evaporation of refrigeration, the condensation of ammonia is one of the four-step cycles. The ammonia condenser uses the heat exchange of circulating water to realize the condensation and liquefaction of ammonia vapor. The general design pressure of the ammonia condenser is close to 2.5MP, is a typical pressure vessel. [0003] In the condensation cycle of ammonia, the total heat transfer coefficient is affected by many factors, among which the non-condensable gas mixed in it is greatly affected. The non-condensable gas in actual production is generally air, because in the condensation process of ammonia vapor In the process, the ammonia v...

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Problems solved by technology

[0004] To achieve condensation, ammonia vapor must pass through the air film in the form of diffusion, resulting in a large mass transfer resistance, which directly reduces the total heat transfer coefficient to a very low level, seriously affecting the condensation process

Once the condensing pressure rises, the discharge pressure of the compressor will directly rise, causing the power consumption of the compressor to seriously exceed the standard, resulting in deterioration of the cooling effect, so the air in the system must be removed

[0005] Although there is an air separator in the ammonia refrigeration system, due to the limitation of the function of the traditional air separator, the heat transfer coefficient is low, and the air cannot be automatically removed, so it is inconvenient to operate and it is difficult to completely remove the air in the system

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