An intermediate cooling two-stage absorption refrigeration system

Abstract

The invention discloses an intermediate cooling two-stage absorption refrigeration system, comprising a high-pressure generator, a condenser, a first throttling device, an intercooler, a high-pressure absorber, a first circulation pump, a second throttling device, The first solution heat exchanger, the third throttling device, evaporator, low-pressure absorber, second circulating pump, fourth throttling device, second solution heat exchanger and low-pressure generator, compared with the traditional two-stage absorption Refrigeration system, the present invention adds an intercooler and changes the connecting pipeline, promotes reasonable energy coupling inside the intercooler through reasonable distribution of steam at the outlet of the low-pressure generator, realizes the change of the intermediate temperature, and effectively adjusts the temperature and generation of high and low pressure stages. The heat input of the device and the corresponding refrigerant flow distribution enable the low-pressure stage to use extremely low-grade heat sources, thereby increasing the utilization range of waste heat absorbed by the two stages, making it more applicable and more flexible to adjust; in addition, through reasonable intermediate temperature adjustment , The cycle performance coefficient can reach more than 0.4.

Description

technical field [0001] The invention belongs to the refrigeration field, and in particular relates to an intermediate cooling two-stage absorption refrigeration system. Background technique [0002] With the increasingly serious energy problem, how to recycle waste steam, waste hot water and other waste heat in production and life, and how to use renewable but low-grade heat energy such as solar energy and geothermal energy has become a research hotspot for sustainable development. The refrigeration system can be directly driven by heat energy, and is one of the main waste heat recovery methods, and the device is simple, so it is a very potential application method in the field of air conditioning. [0003] The traditional single-effect absorption refrigeration system is composed of generator, condenser, throttle valve, evaporator, absorber, circulating pump and solution heat exchanger. The refrigerant vapor generated by heating is absorbed by the solution in the absorber a...

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Problems solved by technology

[0005] However, since the refrigerant vapor in the traditional two-stage system is generated from the high-pressure stage generator, it enters the low-pressure stage absorber directly through the condenser and throttle valve to be absorbed, and the refrigerant vapor generated by the low-pressure stage generator is directly absorbed by the high-pressure stage The two-stage system is similar to a series connection. In order to ensure the cycle performance, the temperature of the high and low pressure stages is often kept consistent, and the input heat and refrigerant flow are also kept unchanged accordingly. Lack of flexible control means, it can only be used for In relatively stable working conditions, the available heat source temperature range is still limited (above about 70°C) and the efficiency is low (COP about 0.38)

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