Cold storage refrigeration system

Abstract

The invention discloses a cold storage refrigeration system. The cold storage refrigeration system comprises a first refrigeration circulation system and a second refrigeration circulation system, wherein the first refrigeration circulation system comprises a main refrigeration unit, an evaporative cooler and a plate type heat exchanger, the second refrigeration circulation system comprises a refrigeration pump, an adjusting station and cold storage chamber heat exchangers, an intercooling liquid is used to fill the refrigeration pump, the adjusting station and the cold storage chamber heat exchangers as well as pipelines connected with the refrigeration pump, the adjusting station and the cold storage chamber heat exchangers, the heat exchange between a refrigerant in the first refrigeration circulation system and the intercooling liquid is realized in the plate type heat exchanger, and the intercooling liquid is a potassium formate-pentaerythritol-water dispersion polyisocyanates-water system secondary refrigerant.

Description

technical field [0001] The invention relates to the technical field of low-temperature refrigeration, in particular to a refrigerator refrigeration system. Background technique [0002] At present, food safety and cold chain construction have entered a period of rapid development. As the central link of low-temperature food circulation, cold storage is crucial to all links of the entire cold chain. For the prior art of large-scale cold storage, liquid ammonia and freon are mainly used as refrigerants for refrigeration. [0003] A liquid ammonia refrigeration system is generally composed of a refrigeration unit, an ammonia oil separator, a high-pressure liquid receiver, a condenser, a low-pressure circulating liquid storage tank, an oil collector, an ammonia pump, and a cooling fan. The cost is low, but this kind of system has complex pipelines, difficult operation and management, and requires high professional level of operators. At the same time, because it is difficult to...

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Problems solved by technology

[0003] A liquid ammonia refrigeration system is generally composed of a refrigeration unit, an ammonia oil separator, a high-pressure liquid receiver, a condenser, a low-pressure circulating liquid storage tank, an oil collector, an ammonia pump, and a cooling fan. The cost is low, but this kind of system has complex pipelines, difficult operation and management, and requires high professional level of operators. At the same time, because it is difficult to realize automation, the system requires operators to be on duty 24 hours a day for operation and management

In addition, there are problems such as difficult oil return and easy leakage of liquid ammonia in the direct evaporation system. Once ammonia gas leaks, it is very easy to cause an explosion accident

[0004] The investment cost of the fluorine refrigeration system is high in the initial stage of construction, and as a direct evaporation system, the freon needs to be mixed with lubricating oil. When the vertical height or the total length of the copper pipe connected to the outdoor unit of the refrigeration system increases, it will cause serious oil return in the refrigeration system. smooth, resulting in a significant reduction in cooling efficiency and a substantial increase in power consumption

Moreover, Freon refrigerants have no obvious characteristics when they leak, so the operating costs will be greatly increased in leak repair and refrigerant filling

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