Two-stage-compression refrigerating and heating pump circulating device based on chemical heat absorption and heat release reversible reaction and method

Abstract

The invention discloses a two-stage-compression refrigerating and heating pump circulating device based on a chemical heat absorption and heat release reversible reaction and a method. The device comprises a working medium circulating loop and a working liquid circulating loop; pressurized gaseous working mediums, namely ammonia gas and carbon dioxide enter a chemical reaction cooler, then are absorbed by a working liquid to generate ammonium carbamate to release heat, and a product is dissolved in the working liquid; the mixed solution passes through a heat regenerator and a throttling deviceto enter a chemical reaction evaporator, the ammonium carbamate is decomposed to generate ammonia gas and carbon dioxide to be evaporated, and then heat is absorbed; and the ammonia gas and the carbon dioxide sequentially pass through a low-pressure compressor and a high-pressure compressor, the high-pressure compressor outputs a pressurized gas working medium, and a circulation is formed. According to the device and the method, refrigerating and heating are realized through the reversible chemical reaction; and the pressure of the gas working mediums is increased in a two-stage compressor compression mode so that a larger compression ratio can be achieved, the device and the method are more suitable for meeting the requirement of the pressure difference of the refrigerating and heating pump circulation of the reversible chemical reaction, and refrigerating and heating can be flexibly switched so that the device and the method can be used in winter and summer.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning equipment, and in particular relates to a two-stage compression refrigeration heat pump cycle device and method based on reversible chemical heat absorption and release reactions. Background technique [0002] The demand for electricity keeps growing rapidly, energy is in short supply, and the sustainable supply capacity of conventional energy is insufficient. Building energy consumption, industrial energy consumption, and transportation energy consumption are also known as the three "big energy households". At the same time, heating and air conditioning account for the largest proportion of building energy consumption. At the same time, in terms of power production, coal is the main power generation, which leads to a large amount of greenhouse gas emissions such as carbon dioxide. Therefore, the use of refrigeration and air-conditioning systems with lower energy consumption has important...

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Problems solved by technology

[0005] Chinese patent application 201480031214.3 discloses a compression refrigeration system including dual refrigerants and liquid working fluids, which uses ammonia and carbon dioxide as refrigerants. Even if the required compression ratio is barely achieved, a single compressor will cause the actual compression process to greatly deviate from the isentropic compression process, causing the compressor exhaust temperature to increase, efficiency to decrease, power consumption to increase, causing overheating loss, and even causing refrigerant in the system to Decomposes with lubricating oil, degrades operating conditions, endangers the normal operation of the compressor, and shortens the life of the compressor; and the circulation system cannot achieve convenient cooling and heating switching, so it can only be used in summer cooling conditions

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