Efficient low-carbon ultra-supercritical secondary reheating combined heat and power generation unit

Abstract

The invention discloses an efficient low-carbon ultra-supercritical secondary reheating cogeneration unit, and relates to a coal-fired power plant ultra-supercritical grade secondary reheating cogeneration unit which is provided with a double-flow ultrahigh pressure cylinder with an additional heat regeneration stage on one side and a double-flow high-medium pressure cylinder with an additional heat supply stage on two sides. The power generation heat consumption of the ultra-supercritical grade secondary reheating cogeneration unit can be remarkably reduced, greenhouse gas emission is remarkably reduced, a huge amount of industrial heat load is connected according to needs, and a large amount of heating heat load is connected according to seasonal needs; the condensing part is provided with an intelligent backpressure adjusting system for measuring the instant temperature of circulating water entering the condenser and adjusting the steam consumption of heating steam 1 and heating steam 2 in real time, so that the volume flow of the steam entering the tail blade of the medium-low pressure cylinder adapts to the backpressure which can be achieved by the circulating water temperature, the effective enthalpy drop of the tail blade of the medium-low pressure cylinder is maximized, and the energy consumption of the tail blade of the medium-low pressure cylinder is reduced. And meanwhile, the steam does not flow back at the blade root to scour the blade root.

Description

(1) Technical field: [0001] The high-efficiency and low-carbon ultra-supercritical secondary reheat cogeneration unit of the present invention relates to a double-flow ultra-high pressure cylinder with an additional heat recovery stage on one side, and a coal-fired high-medium pressure cylinder with an additional heat supply stage on both sides of the double-flow The ultra-supercritical double-reheat cogeneration unit of the power station can significantly increase the heat supply work ratio, significantly reduce the heat consumption of the ultra-supercritical double-reheat cogeneration unit for power generation, and significantly reduce greenhouse gas emissions. It needs to carry a huge amount of industrial heat load, and it needs to carry a large amount of heating heat load according to the season. (two) background technology: [0002] The design values ​​of the main steam temperature / primary reheat steam temperature / secondary reheat steam temperature of the typical turbin...

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Problems solved by technology

[0037] The application has no steam extraction ports on the body of the ultra-high pressure cylinder, high and medium pressure cylinder, and medium and low pressure cylinder, so it is difficult to provide a huge amount of industrial steam and a large amount of heating steam; however, as a condensing generator set, the application’s The ability of primary frequency regulation and energy saving and emission reduction is excellent

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