Intercooling type two-stage absorption refrigeration system

Abstract

The invention discloses an intercooling type two-stage absorption refrigeration system. The intercooling type two-stage absorption refrigeration system comprises a high-pressure generator, a condenser, a first throttling device, an intercooler, a high-pressure absorber, a first circulating pump, a second throttling device, a first solution heat exchanger a third throttling device, an evaporator, a low-pressure absorber, a second circulating pump, a fourth throttling device, a second solution heat exchanger and a low-pressure generator. Compared with a traditional two-stage absorption refrigeration system, the intercooler is added, connection pipelines are changed, and the reasonable distribution of steam of the outlet of the low-pressure generator is achieved so that the reasonable energy coupling inside the intercooler can be promoted and the medium temperature changes can be achieved; the generation temperature of the high-pressure stage and the low-pressure stage, the generator heat input and the corresponding refrigerant flow distribution are effectively regulated, an extremely-low-grade heat source can be used by the low-pressure stage, and therefore the absorbed waste heat utilization range of the two stages is widened, and the intercooling type two-stage absorption refrigeration system is wider in application range and more flexible to regulate; in addition, through the reasonable middle temperature regulation, the circulating performance coefficient can reach 0.4 or above.

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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