Vapor compression refrigeration cycle expansion work recovery system

Abstract

The invention discloses a vapor compression refrigeration cycle expansion work recovery system. The system comprises a main compressor (i), a condenser (ii), a gas and liquid separator (iii), a gas expander (iv), an expansion valve (v), an evaporator (vi) and an auxiliary compressor (vii), wherein the condenser (ii) is connected with the main compressor (i) and cools gaseous working mediums from the main compressor into a gas and liquid two-phase mixture; the gas and liquid separator (iii) is connected with the condenser and performs phase separation on the gas and liquid two-phase mixture from the condenser; the gas expander (iv) is connected with a gas phase working medium outlet of the gas and liquid separator; the expansion valve (v) is connected with a liquid phase working medium outlet of the gas and liquid separator; the evaporator (vi) is connected with the expansion valve; the auxiliary compressor (vii) is connected with the evaporator; a gaseous working medium outlet of the gas expander and a gaseous working medium outlet of the auxiliary compressor are jointly communicated with a gaseous working medium inlet of the main compressor through a pipeline. Due to stage compression of the system, the compression ratio in each compression process is decreased, the efficiency of the compressors is guaranteed, and the circulation COP is improved.

Description

technical field [0001] The invention relates to an expansion work recovery system, in particular to a vapor compression refrigeration cycle expansion work recovery system. Background technique [0002] The vapor compression refrigeration cycle based on thermodynamic processes such as evaporation, compression, condensation, and throttling can realize the reverse transfer of heat from a low-temperature environment to a high-temperature environment, thereby providing stable cooling / heating loads for industrial production and daily life. In my country, the application of refrigeration and heat pump equipment based on vapor compression cycles is growing rapidly, which not only leads to a continuous increase in electricity demand, indirectly promotes the consumption of fossil fuels such as coal, but also exacerbates the seasonal unevenness of grid load, threatening The overall security of the grid. Therefore, optimizing the vapor compression refrigeration cycle has important pract...

AI Technical Summary

Problems solved by technology

The problem with this device is that it is limited by the compressor, and the traditional single-stage vapor compression refrigeration cycle has certain limitations on the temperature difference between the cold and heat sources.

The traditional vapor compression cycle is generally suitable for working conditions where the temperature rise of the cycle is less than 70°C. This is because as the temperature rise of the cycle increases, the compressor pressure ratio will increase accordingly, which will lead to a decrease in compressor efficiency and an increase in power consumption. , the exhaust temperature rises, and eventually causes the cycle performance to deteriorate

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