Steam extraction back pressure type feed water pump steam turbine set system and operation method

Abstract

The invention relates to a steam extraction back pressure type feed water pump steam turbine set system and an operation method. The system comprises a feed water pump small steam turbine, a feed water pump, a power balance small generator, a feed water pump speed regulation device, a first heater, a second heater, a third heater, a driving steam pipeline, a discharge pipeline, a steam extractionand supplement pipeline and a water supply pipeline, wherein the feed water pump, the feed water pump speed regulating device, the feed water pump small steam turbine and the power balance small generator are coaxially connected; the feed water pump small steam turbine is connected with the first heater through an exhaust pipeline; the feed water pump small steam turbine is connected with the second heater and the third heater through an exhaust pipeline; the feed water pump small steam turbine is connected with a driving steam pipeline; the feed water pump small steam turbine is connected with the discharge pipeline; the steam extraction and supplement pipeline is connected with the third heater; and the water supply pipeline is communicated with the water sides of the first heater, the second heater and the third heater. The power balance of the whole system can be ensured, the efficiency of the feed water pump small steam turbine is improved, the efficiency of the whole system is improved, and coal consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a steam extraction back pressure feed water pump steam turbine unit system and an operation method. Background technique [0002] With the development of high-parameter and large-capacity generating units with one million primary reheating and two-time reheating, ultra-supercritical units with high parameters of 35MPa inlet steam parameters are becoming research objects, which can further improve the cycle thermal efficiency of the unit and further promote Energy conservation. [0003] In order to reduce the superheat degree of extraction steam recovery under high parameter conditions, an extraction steam back pressure feedwater pump turbine unit system is proposed. That is, the feedwater pump is driven by setting a steam extraction back pressure small steam turbine, that is, at the same time, the steam extraction in the middle of the small steam tur...

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Problems solved by technology

[0005] At the same time, the system has the problem of increasing the complexity of the adjustment operation compared with the traditional feed water pump and small steam turbine

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