Combined cooling heating and power system driven by low-grade waste heat

Abstract

The invention relates to a combined cooling heating and power system driven by low-grade waste heat. The combined cooling heating and power system comprises an organic Rankin cycle (ORC) unit. The ORC unit is composed of a working medium pump, an evaporator, an expander and a built-in heat pump cycle unit which are sequentially connected and form circulation. The built-in heat pump cycle unit comprises a first heat exchanger, a throttle valve, a second heat exchanger, a compressor and a four-way reversing valve. Heat exchange is conducted between the evaporator and the first heat exchanger in the built-in heat pump cycle unit. Heat exchange is conducted between the second heat exchanger and waste heat flow and between the second heat exchanger and externally-connected heat exchange flow. The output work end of the expander is connected with the compressor and the electric generator. When the combined cooling heating and power system is operated, work acted by the expander preferentially drives the compressor coaxially connected with the expander, so that output of cold energy or heat energy of the built-in heat pump cycle unit is achieved; the remaining work drives the electric generator to generate electricity; therefore combined cooling heating and power of the combined cooling heating and power system is achieved. Compared with the prior art, the combined cooling heating and power system has the advantages that the process is simple; the equipment parts are small in number; the use ratio of the waste heat energy is high; the cost of the devices of the combined cooling heating and power system is low, etc.

Description

technical field [0001] The invention relates to a cogeneration system of cooling, heating and power, in particular to a cogeneration system of cooling, heating and power driven by low-grade waste heat. Background technique [0002] With the rapid development of industrialization and urbanization, my country's energy consumption continues to rise, and the resulting environmental burden is also increasing. Therefore, increasing energy conservation and consumption reduction, further improving energy utilization efficiency, and vigorously developing renewable energy are the key to establishing a resource-saving and environment-friendly industrial structure and production mode in China, as well as breaking the constraints of energy resources and the environment, and taking a new path of industrialization with Chinese characteristics. inevitable choice. [0003] Renewable energy such as low-grade industrial waste heat, solar energy, and geothermal energy has gradually attracted p...

AI Technical Summary

Problems solved by technology

The combined heat and power system realizes the recovery and utilization of low-grade waste heat, and also realizes the cogeneration of heat and electricity. However, the organic Rankine cycle subsystem and the heat pump cycle subsystem in this system are relatively independent, which not only makes the organic Rankine cycle The energy of the circulation subsystem is easy to lose, and it also increases the number of components in the entire system, the process is not simplified enough, and the cost of the entire system is relatively high

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