Steam turbine high-pressure steam guide pipe drainage system and drainage method

Abstract

The invention discloses a steam turbine high-pressure steam guide pipe drainage system and method, and belongs to the technical field of thermal power generation devices. The system comprises a high-pressure cylinder applied to the field of steam turbines, four steam guide pipes are arranged on the high-pressure cylinder, each steam guide pipe is provided with a main steam adjusting valve and further communicated with a drain pipe, and the drain pipe is communicated with a drain flash tank through a valve assembly; warm pipe pipelines are arranged between the drain pipes, the drain pipes are communicated in series through the warm pipe pipelines, or the drain pipes are communicated in pairs through the warm pipe pipelines; according to the invention, the structural design breaks through the design of a traditional structure, especially the design of utilizing a heating pipeline, and the mutual communication effect is realized, so that the steam guide pipe behind the opened high-pressure main steam regulating valve heats the steam guide pipe behind the closed high-pressure main steam regulating valve, the risk that water or cold steam enters a high-pressure cylinder is eliminated, and the service life of the high-pressure cylinder is prolonged. And the safety of the unit is improved.

Description

technical field [0001] The invention relates to a drainage system and a drainage method for a high-pressure steam guide pipe of a steam turbine, belonging to the technical field of thermal power generation devices. Background technique [0002] In the design of the steam turbine's conventional drainage system, in order to achieve the best economy, four independent drainage pipes are used for drainage of the steam guide pipe after the high-pressure regulating valve of the unit that uses nozzle steam distribution, and a separate drainage valve is set on the drainage pipeline. [0003] With the vigorous development of new energy, in order to absorb water energy, wind energy, and solar energy, deep peak regulation and flexible operation of thermal power units have become normalized. When the valve is turned on, the steam guide pipe behind the high-adjustment valve that has not been opened for a long time is prone to water accumulation. When the load rises and the valve is opened...

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Problems solved by technology

[0003] With the vigorous development of new energy, in order to absorb water energy, wind energy, and solar energy, deep peak regulation and flexible operation of thermal power units have become normalized. When the valve is turned on, the steam guide pipe behind the high-adjustment valve that has not been opened for a long time is prone to water accumulation. When the load rises and the valve is opened, it will cause water or cold steam to enter the high-pressure cylinder, causing changes in expansion difference and unit vibration, resulting in jumping machine, seriously affecting the safety of unit operation

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