Two-stage cascade absorption/compression composite refrigeration cycle system jointly driven by waste heat and power of engines

Abstract

The invention belongs to the field of marine mechanical refrigeration, and provides a two-stage cascade absorption/compression composite refrigeration cycle system jointly driven by waste heat and power of engines. The cycle includes 1) a high temperature level absorption/compression composite refrigeration cycle; 2) a low temperature level absorption/compression composite refrigeration cycle; and3) an engine waste heat defrosting system. Under the circumstances that waste heat exhausted by a fishing boat engine is sufficient, cooling capacity needed by a fishing boat refrigerating chamber and freezing chamber can be provided by the two-stage cascade absorption refrigeration cycle driven by the waste heat; and under the circumstances of insufficient waste heat, compression refrigeration can be carried out through a corresponding high temperature level and low temperature level compressor which are driven by the fishing boat engine, and therefore, the rest of cooling capacity needed bythe fishing boat refrigerating chamber and freezing chamber can be supplemented. Heat defrosting can be performed on the refrigerating chamber and the freezing chamber by using part of engine waste heat, so that the consumption of other energy can be saved, and good refrigeration effects of the refrigeration system can be guaranteed.

Description

Technical field [0001] The invention relates to a two-stage cascade absorption / compression hybrid refrigeration cycle system that can realize energy saving and emission reduction and is jointly driven by waste heat of fishing boat engines and power, and belongs to the field of ship mechanical refrigeration. Background technique [0002] Ocean fishing boats need to freeze the caught seafood at low temperatures due to long-term navigation at sea. Large and medium fishing vessels are usually equipped with refrigeration devices. The compression refrigeration device generally used at present needs to ensure normal operation through the shaft power output by the fishing boat engine. Moreover, as the refrigeration temperature decreases, the coefficient of performance of the refrigeration device gradually decreases, which means that more fuel is needed to ensure the normal navigation of the fishing boat and the normal operation of the refrigeration device at the same time. This not onl...

AI Technical Summary

Problems solved by technology

However, the evaporation temperature of traditional absorption refrigerators is not low, which is a prominent defect of absorption refrigeration.

Lithium bromide-water absorption refrigeration can only produce temperatures above 0°C

Although ammonia-water absorption refrigeration can operate below 0°C, it is very difficult to obtain a temperature below -30°C

Although the self-cascading absorption refrigeration cycle can obtain a much lower evaporation temperature than the traditional absorption refrigeration, the cycle performance coefficient is low

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