A coal-based supercritical carbon dioxide Brayton cycle power generation system with intermediate preheating

Abstract

The invention discloses a coal-based supercritical carbon dioxide Brayton cycle electrical power generating system achieving intermediate preheating. The system is a closed type indirect heating supercritical carbon dioxide electrical power generating system and comprises a main compressor, a low-pressure turbine, a generator, a precooler, a low-temperature regenerator, a high-temperature regenerator, a boiler, a high-pressure turbine, a re-compressor and a mixer. The boiler comprises a main working medium radiation heating surface, a reheating working medium radiation heating surface, a high-temperature superheater, a high-temperature reheater, a low-temperature reheater, a low-temperature superheater, an intermediate preheater and an air preheater. The intermediate preheater is arranged behind the low-temperature reheater and the low-temperature superheater of a tail flue of the boiler and in front of the air preheater, working media behind the mixer and in front of a cold side inlet of the high-temperature regenerator are preheated, meanwhile, waste heat of the tail flue of the boiler is effectively used, the exhaust gas temperature of the boiler is reduced, and the heat efficiency of the boiler and the electrical power generating efficiency of the whole system are improved.

Description

technical field [0001] The invention belongs to the field of high-efficiency thermal power generation of supercritical carbon dioxide, and in particular relates to a coal-based supercritical carbon dioxide Brayton cycle power generation system with intermediate preheating. Background technique [0002] The efficiency of generating units has an important impact on the development of the national economy and environmental protection. The composition characteristics of my country's energy reserves determine that coal-fired generating units will still be the main force in my country's power industry in the next few decades. Therefore, the improvement of coal-fired generating units Efficiency is particularly important in our country. At present, the two mainstream technical routes recognized internationally to improve the efficiency of coal-fired power generation units are 700°C power generation technology and supercritical carbon dioxide Brayton cycle power generation technology....

AI Technical Summary

Problems solved by technology

The 700°C power generation technology is the most direct method to improve the power generation efficiency of the unit. However, at present, the development of 700°C superalloy materials is difficult and costly, and the material problem has become the biggest bottleneck of the 700°C power generation technology.

[0004] However, according to research, there are very few published results and patents at home and abroad that introduce the application of supercritical carbon dioxide Brayton cycle in the field of coal-fired power generation, and even fewer patents involve solving the matching problem between the above-mentioned coal-fired boiler and supercritical carbon dioxide Brayton cycle Methods

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