Combined power generating system based on waste-heat utilization of combustion motor

Abstract

The invention discloses a combined power generating system based on waste-heat utilization of a combustion motor. The combined power generating system based on waste-heat utilization of the combustion motor is composed through combination of Bretton cycle and organic Rankine cycle. The combined power generating system based on waste-heat utilization of the combustion motor mainly comprises a gas turbine, a heat exchanger, a gas compressor, a turbine, a condenser, a booster pump and a circulating pump. Waste gas of the combustion motor firstly passes through a heater and transfers heat to carbon dioxide of Bretton cycle, carbon dioxide steam at the high temperature and the high pressure is formed to drive the gas turbine to generate power. The waste gas of the combustion motor still has high heat after passing through the heater, then the heat is transferred to an organic working medium in Rankine cycle through an evaporator, and organic working medium steam at the high temperature and the high pressure is formed. Carbon dioxide discharged from the gas turbine passes through a cooler, and heat of the carbon dioxide is transferred to the organic working medium in the Rankine cycle too, and organic working medium steam at the high temperature and the high pressure is formed. The turbine with the organic working medium is driven to generate power by two blasts of organic working medium steam at the high temperature and the high pressure.

Description

【Technical field】 [0001] The invention belongs to the field of high temperature and medium and low temperature heat energy recovery and power engineering, and relates to a combined power generation system based on the utilization of waste heat of an internal combustion engine. 【Background technique】 [0002] The heat taken by the exhaust gas when the internal combustion engine is running accounts for about 35% of the heat released by the complete combustion of the fuel, and currently this part of the heat is dissipated in the form of waste heat. Recovering this part of the waste heat from the exhaust gas of the internal combustion engine can save energy and reduce consumption. At present, there are the following Several technical solutions to recycle the waste heat of internal combustion engines: [0003] 1. Organic Rankine Cycle (ORC): Organic Rankine Cycle is a cycle that replaces the water working medium in the traditional steam Rankine cycle with an organic working mediu...

AI Technical Summary

Problems solved by technology

[0009] For the above-mentioned prior art, the organic Rankine cycle uses the waste heat of the flue gas of the internal combustion engine, and the heat exchange temperature difference in the heat exchanger is large, resulting in a large irreversible loss; the steam power cycle using water as the working medium or the cycle using water as the cold source It is difficult to apply in some water-scarce areas in the north

Images