A pressurized fluidized bed combined cycle power generation system based on supercritical carbon dioxide

Abstract

The invention provides a pressurized fluidized bed combined cycle power generation system based on supercritical carbon dioxide. The pressurized fluidized bed combined cycle power generation system based on the supercritical carbon dioxide comprises a top cycle power generation system, a gas turbine power generation system and a waste heat power generation system, wherein the top cycle power generation system adopts a supercritical carbon dioxide single reheating recompression cycle, a working medium absorbs heat from the interior of a furnace of the pressurized fluidized bed to do work in a CO2 turbine, the gas turbine power generation system is characterized in that high-temperature and high-pressure flue gas of an outlet of the furnace does work in a gas turbine, the waste heat power generation system is characterized in that waste heat flue gas of an outlet of the gas turbine heats CO2, and the CO2 is subjected to recompression cycle to do work in the CO2 turbine, the CO2 turbine and the gas turbine each bear a part of work amount, so that a gas-CO2 combined cycle is formed. Meanwhile, in order to ensure that the heat is fully absorbed, compact heat exchangers are adopted in apressurized fluidized bed boiler and adopted by the waste heat power generation system, and the pressurized fluidized bed combined cycle power generation system based on the supercritical carbon dioxide has the advantages that the power generation efficiency is high, the system structure is compact, and the advantage of a supercritical carbon dioxide cycle can be brought into full play.

Description

technical field [0001] The invention belongs to the field of high-efficiency power generation equipment, and in particular relates to a pressurized fluidized bed combined cycle power generation technology based on supercritical carbon dioxide. Background technique [0002] Efficient, clean and low-carbon utilization of energy is the general trend of the energy revolution. Especially for our country, in the next 30-50 years, coal will still be the main primary energy source in our country. The dominance of coal in various power generation technologies will not change in the short to medium term. Then, under the circumstance of increasing environmental protection pressure, how to efficiently and cleanly utilize coal resources is a hot spot that researchers pay attention to. In the field of coal-fired power generation, the focus is on how to improve power generation efficiency and how to reduce pollutant emissions. [0003] At present, the traditional water vapor Rankine cyc...

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Problems solved by technology

[0004] But S-CO 2 The combination of coal-fired thermal power generation and traditional pulverized coal boilers will also face some problems: the heat load in pulverized coal boilers is high and the S-CO 2 The temperature of the circulating inlet working fluid is also high, which will threaten the safety of the metal material of the pipe wall

S-CO 2 The circulating working medium flow rate is 6-8 times that of the traditional water unit, and the layout of the heating surface of the traditional pulverized coal furnace will cause a large pressure drop of the boiler

At the same time, large pulverized coal furnaces are not suitable for compact and miniaturized S-CO 2 Brayton cycle

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