Secondary reheating unit with ultrahigh pressure cylinder and high-intermediate pressure cylinder both provided with additional heat regeneration stages

Abstract

The invention discloses a secondary reheating unit with an ultrahigh pressure cylinder and a high-intermediate pressure cylinder both provided with additional heat regeneration stages, and relates toa secondary reheating unit in the fire coal power station ultra-supercritical stage. In particular, the ultrahigh pressure cylinder and the high-intermediate pressure cylinder are both provided with the additional heat regeneration stages, a heat regeneration system is further optimized, main steam, primary reheating steam and secondary reheating parameters are further optimized, the heat consumption of the secondary reheating unit in the ultra-supercritical stage can be obviously reduced, and the greenhouse gas discharge can be obviously reduced.

Description

(1) Technical field: [0001] The double reheating unit of the ultra-high pressure cylinder and the high and medium pressure cylinders with additional heat recovery stages of the present invention relates to an ultra high pressure cylinder and high and medium pressure cylinders with additional heat recovery stages. After further optimization of the heat recovery system, the main steam , primary reheat steam, and secondary reheat steam parameters are further optimized for coal-fired power plants with ultra-supercritical grade double reheat units, which can significantly reduce the heat consumption of ultra-supercritical grade double reheat units and significantly reduce greenhouse gas emissions . (two) background technology: [0002] The design values ​​of the main steam temperature / primary reheat steam temperature / secondary reheat steam temperature of the typical turbine-side main steam temperature / primary reheat steam temperature of the existing double reheat steam turbine ge...

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Problems solved by technology

[0016] When the secondary reheat temperature is constant, the exhaust humidity of the final blade of the low-pressure cylinder is related to the level of the secondary reheat pressure. Reheat pressure, that is, the secondary reheat pressure is determined by the exhaust steam humidity of the last stage blade of the low-pressure cylinder. In this way, the effective enthalpy drop of the high-pressure cylinder is often significantly compressed, and the heat absorption of the secondary reheat system is also limited.

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