Working process of working fluid and flue gas in supercritical co2 Brayton cycle coal-fired power generation system

Abstract

The invention belongs to the field of efficient power generation equipment, and discloses a supercritical CO2 Bretton circulation coal-fired power generation system working medium and smoke work process. In the system, a flow dividing allocation manner is adopted for flowing of a supercritical CO2 working medium in a boiler; a double-level arrangement manner is adopted in a tail air preheater; circulation leading of the working medium into the reheating and intermediate cooling arrangement manner is conducted; and the working medium is cyclically subjected to flow dividing from a high-pressurecompressor outlet, enters a smoke cooler to be subjected to heat absorbing, and then is gathered to a high-pressure side outlet of a low-temperature heat regenerator. Through the flow dividing allocation of the working medium in the boiler, the pressure drop of the boiler can be reduced; through the double-level arrangement of the air preheater, the secondary air can reach the preset value; and through cooperation of the smoke cooler and the air preheater arrangement, the problem about tail smoke waste heat absorption is solved. A plurality of key problems about supercritical CO2 Bretton circulating and coal-fired thermal power generation coupling are solved, the system is simple in arrangement, running parameters are stable, and a thermal power system and the boiler are high in efficiency.

Description

technical field [0001] The invention belongs to the field of high-efficiency power generation equipment, in particular to a supercritical CO 2 Working process of Brayton cycle coal-fired power generation system working fluid and flue gas. [0002] technical background [0003] As a primary energy source, coal plays an important role in the global energy structure. It has large reserves, is easy to mine, and has rich experience in use. Taking China as an example, coal accounts for 75% of China's primary energy consumption structure, accounting for the world's total coal consumption. a quarter of. Especially in the power sector, thermal power units account for more than 70% of the total installed capacity, most of which are coal-fired steam turbine power stations. However, the use of coal has increased the burden of environmental protection and the greenhouse effect. Under such circumstances, the development of advanced power cycle technology to improve unit performance is of...

AI Technical Summary

Problems solved by technology

The intercooling will reduce the power consumption of the compressor, and at the same time, it will appropriately reduce the temperature of the working fluid at the boiler inlet, which can be reduced by about 5°C under the calculated working conditions, but the intercooling will have an impact on the operating characteristics of the low temperature regenerator

Heat recovery can reduce the loss of cold source and improve cycle efficiency, especially the shunt recompression heat recovery arrangement, and make the heat capacity of the working fluid on the cold and hot sides of the low-temperature regenerator close to each other, improving the heat recovery effect, but the heat recovery will also increase the CO 2 The temperature of the working fluid at the boiler inlet

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