Coal-based novel supercritical working medium multistage distribution reheat efficient power generation system

Abstract

The invention discloses a coal-based novel supercritical working medium multistage distribution reheat efficient power generation system. The coal-based novel supercritical working medium multistage distribution reheat efficient power generation system comprises a multistage boiler reheat system, a multistage turbine power generation system, a multistage working medium distribution and recompression system and a multistage fume waste heat recovery system. The multistage working medium distribution and recompression system comprises a main compressor, multistage re-compressors, all stages of regenerators and pre-coolers, wherein the main compressor and the re-compressors are arranged in a distributed mode, and the regenerators and the pre-coolers are arranged on all distribution branches. By utilizing the system, a working medium is divided into multiple stages for respective compression, and heat is recovered through the multistage regenerators, and therefore the efficiency of all stages of compressors is improved. Meanwhile, as all the stages of regenerators can effectively adjust the flow ratio, the pinch point heat transfer deterioration effect of a traditional single-stage system is effectively avoided, and heat transfer efficiency is improved. The multistage fume waste heat recovery system utilizes system waste heat resources in a stepped mode and meanwhile heats a new working medium and combustion air, and therefore the utilization efficiency of energy is improved.

Description

technical field [0001] The invention belongs to the technical field of advanced high-efficiency power generation systems, and specifically relates to a coal-based new supercritical working medium multi-stage split-flow reheating type high-efficiency power generation system. Background technique [0002] Continuously improving the efficiency of generator sets is the eternal theme and goal of the development of the power industry. At present, the main steam temperature of the world's most advanced ultra-supercritical steam generator set is 600°C, the reheat steam temperature is 620°C, and the power generation efficiency has increased from 39% in 1960 to 44.5% now. If you want to further improve the efficiency of the unit, you need to increase the steam temperature to 700°C. As early as the 1990s, developed countries such as Europe, America, and Japan have carried out related research one after another. However, due to funding cuts, high fixed investment, and cracks in the act...

AI Technical Summary

Problems solved by technology

But in general, the Brayton cycle thermal power generation technology using new supercritical working fluid is still in its infancy, and most of the existing patents are preliminary conceptual designs for new energy sources such as solar energy, and the cycle efficiency of the system is generally not high (mostly 40 %the following)

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