Compression-absorption-diffusion combined refrigerating plant and its refrigeration cycle method

Abstract

The invention provides a compression-absorption-diffusion composite refrigeration device and a refrigeration circulation method which adopts the device, while the device and the method belong to the technical field of refrigeration devices. The device is coupled in a series connected way by an absorption refrigeration system, a compression refrigeration system and a diffusion refrigeration system and is composed of a common heat exchange device, a throttling device and a refrigeration working medium; and the device comprises a liquid storage device, a solution pump, a generator, a rectifier, a first-stage condenser, a second-stage condenser, a compressor, a throttle valve, an evaporator and an absorber. Ammonia vapor completes first pressure increase in the diffusion refrigeration system and the absorption refrigeration system and enters the compressor through a pipeline after entering the first-stage condenser for completing second pressure increase, after that, the ammonia vapor enters the second-stage condenser to be cooled to liquid ammonia, the liquid ammonia enters the evaporator through the throttle valve, the evaporation and the refrigeration are carried out under the role of a diffusing agent of the evaporator, the liquid ammonia is further mixed with the diffusing agent to enter the absorber, ammonia in the absorber is absorbed, and the diffusing agent is returned back to the evaporator along the pipeline. The device of the invention is applicable to small-scale low-grade waste heat refrigeration occasions.

Description

technical field [0001] The invention belongs to the technical field of refrigeration equipment, and in particular relates to a compression-absorption-diffusion composite refrigeration device and a refrigeration cycle method thereof. Background technique [0002] At present, the commonly used refrigeration method is phase-change refrigeration, and the essence of phase-change refrigeration is to obtain a relatively high pressure and a relatively low pressure, so that the gaseous working medium is liquefied at a relatively high pressure (condenser) to release heat, and the condensed liquid working medium is again Can be vaporized endothermic at relatively low pressure (evaporator). The refrigeration methods commonly used in refrigeration equipment on the market can be divided into compression refrigeration, absorption refrigeration, jet refrigeration and diffusion refrigeration according to different technical means to achieve relatively low pressure and high pressure. These r...

AI Technical Summary

Problems solved by technology

In terms of low-grade waste heat refrigeration, a single conventional refrigeration method is difficult to meet the requirements. Generally, multiple methods of composite refrigeration are used, such as the "Ammonia Water Absorption and Compression Composite Refrigeration Cycle System and Refrigeration Circulation method” (Patent No. 200710022954.2) proposes a refrigeration cycle system that couples the absorption system and the compression system in series, which can operate efficiently under low-grade waste heat sources, but the system still needs to use a high-pressure solution pump. It is more suitable for applications and large-scale refrigeration systems, but it is limited in some small-scale refrigeration equipment or occasions with strict volume requirements

[0004] So far, there is no small-scale low-grade waste heat-driven refrigeration equipment on the market

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