High-temperature steam pipeline oxide skin blowing and sweeping structure of power station boiler

Abstract

The invention discloses a high-temperature steam pipeline oxide skin blowing and sweeping structure of a power station boiler. The high-temperature steam pipeline oxide skin blowing and sweeping structure of the power station boiler is characterized in that an outlet of a steam-water separator is divided into two paths after passing through a superheater, one path communicates with one end of a high-pressure bypass through a high-pressure bypass regulating valve, the other path communicates with an inlet of a high-pressure cylinder through a high-pressure main steam valve, a steam outlet of the high-pressure cylinder communicates with the other end of the high-pressure bypass through a pipeline and then communicates with an inlet of a reheater, an outlet of the reheater is divided into twopaths, one path communicates with an inlet of a medium-pressure cylinder through a medium-pressure main steam valve, the other path communicates with one end of a low-pressure bypass through a low-pressure bypass regulating valve, the other end of the low-pressure bypass communicates with a condenser, an outlet of the medium-pressure cylinder communicates with an inlet of a low-pressure cylinder,an outlet of the low-pressure cylinder communicates with an inlet of the condenser, and a filter screen is arranged at a liquid outlet of the bottom of the condenser. The structure can be used for achieving blowing and sweeping of oxide skins in a high-temperature steam pipeline.

Description

Technical field [0001] The invention belongs to the field of thermal power generation engineering infrastructure debugging, and relates to a power plant boiler high-temperature steam pipeline oxide scale purge structure. Background technique [0002] The oxidation reaction of metal pipes and water vapor under high temperature and high pressure conditions and the formation of oxide scale is a normal and unavoidable natural process. It is generally believed that there is an exponential curve relationship between metal temperature and oxidation rate. A small increase in temperature will cause a substantial increase in steam oxidation rate. Frequent over-temperature or long-term high level of tube wall metal temperature during operation will cause the boiler heating surface The root cause that the oxide scale on the inner wall of the pipe grows thick in a short time. [0003] Large fluctuations in steam temperature and steam pressure during operation will cause scale peeling. Due to ...

AI Technical Summary

Problems solved by technology

Since the system has been perfected and there is no temporary emptying of the pipeline, it is difficult to discharge this part of the new scale, and the risk of foreign matter blockage of the heating surface tube and overheating of the tube is greatly increased.

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