Trans-critical-compression/absorption composite refrigeration device utilizing low-grade heat

Abstract

The invention discloses a trans-critical-compression / absorption composite refrigeration device utilizing low-grade heat, which comprises a high-pressure stage absorption refrigeration subsystem, a trans-critical circulation subsystem and a low-pressure stage absorption refrigeration subsystem. Through reasonable energy coupling among the systems, the utilization efficiency of electric energy as well as the utilization efficiency of low-grade heat of an input system is improved, and the low-grade heat at a very low temperature can be fully utilized, so that the trans-critical-compression / absorption composite refrigeration device has better economic performance; and the whole device has a simple structure, thereby facilitating steady operation and requiring low construction and maintenance costs.

Description

technical field [0001] The invention relates to a transcritical / absorption composite refrigeration device, in particular to a transcritical / absorption refrigeration composite refrigeration device utilizing low-grade heat. Background technique [0002] In the industrial production sector, low-grade waste heat with a temperature lower than 200°C, or even 50-60°C, exists widely and in large quantities, such as gas turbines, metallurgical industry, cement industry, petrochemical industry, and food processing industry discharge a large amount of low-grade waste heat. For these waste heat, the traditional technology is difficult to use and the economy is extremely poor. Therefore, it is often discharged directly to the environment, which not only causes a great waste of energy, but also causes bad environmental thermal pollution. [0003] Utilizing low-grade heat for air-conditioning refrigeration is also a very potential application path, and absorption refrigeration technology i...

AI Technical Summary

Problems solved by technology

[0006] There are some defects in the open compression / absorption compound refrigeration technology: (1) The inlet and outlet pressure of the compressor are closely related to the temperature of the heat source at the inlet and outlet of the connection position, and there are special requirements for the compressor. For example, in order to avoid polluting the solution, the compressor The requirement is an oil-free compressor; (2) The compression system and the absorption system use the same refrigerant. Due to the essential difference between absorption refrigeration and compression refrigeration, the use of the same refrigerant will inevitably sacrifice the performance of one of them, or even the performance of both. Performance; (3) The choice of refrigerant / working fluid is relatively limited. For example, working fluids such as lithium bromide / water or ammonia / water have special requirements for the material of the compressor, and the isentropic efficiency of the compressor is low

This invention reduces the power consumption of the compressor through the function of the ejector, and also successfully utilizes low-grade heat, but the cooling effect needs to be improved

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