Supercritical carbon dioxide circulating coal-fired power generation system

Abstract

The invention relates to a supercritical carbon dioxide circulating coal-fired power generation system. The supercritical carbon dioxide circulating coal-fired power generation system comprises a hearth and a primary reheater, a membrane type wall is arranged on the inner wall of the hearth, a secondary superheater is arranged at the upper end of the hearth, a separator is connected to the outer end of the top of the hearth, the bottom end of the separator is connected with a return valve, one end of the bottom of the return valve is connected into the hearth, the other end of the bottom of the return valve is connected with an external heat exchanger, and an outlet of the external heat exchanger is connected to one end of the bottom of the hearth. The supercritical carbon dioxide circulating coal-fired power generation system has the beneficial effects that the supercritical carbon dioxide circulation is combined with a circulating fluidized bed boiler, the fuel flexibility of the circulating fluidized bed boiler is good, high-sulfur coal and low-calorific-value fuel can be efficiently utilized, the up-to-standard emission can be realized only through the desulfurization and low-temperature combustion nitrogen inhibiting in the furnace, the heat efficiency of the circulating fluidized bed boiler can achieve 90% or more, and compared with a pulverized coal fuel boiler, the circulating fluidized bed boiler has better economical advantages.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a supercritical carbon dioxide cycle coal-fired power generation system. Background technique [0002] The energy structure is "more coal, less oil and less gas". In the primary energy consumption, coal accounts for more than 70%. At the same time, comprehensively promote the ultra-low emission of coal-fired power plants, rely on the existing advanced coal-fired boiler technology (such as: circulating fluidized bed boiler), and at the same time, develop a new type of high-efficiency power cycle system (such as: supercritical carbon dioxide cycle), further Improve coal-to-electricity conversion efficiency and reduce power generation costs. [0003] The supercritical carbon dioxide cycle can also be integrated with the coal-fired boiler to replace the steam turbine unit to form a new thermal power generation system. Considering the characteristics of the deep heat...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a supercritical carbon dioxide cycle coal-fired power generation system to solve the problem of how to integrate a circulating fluidized bed coal-fired boiler and a supercritical carbon dioxide cycle to form a new power generation system to ensure the high efficiency of the system. efficiency, and to improve the economics of the unit

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