Device and method for preventing steam turbine shaft seal from leakage

Abstract

The invention relates to a device and method for preventing a steam turbine shaft seal from leakage. Currently, no device which can solve the leakage problem of a steam turbine shaft seal from the root exists. The device for preventing the steam turbine shaft seal from leakage comprises a steam turbine which is provided with a shaft seal system, and the device is characterized by further comprising an air compressor, an air storage tank, an air drier and a shaft seal gap position nozzle block; the air storage tank is connected with the air compressor through a pipeline, the air drier is connected with the air storage tank through a pipeline, the shaft seal gap position nozzle block is connected with the air drier through a pipeline, and the shaft seal gap position nozzle block is distributed adjacent to the shaft seal system. A method for preventing the steam turbine shaft seal from leakage comprises the steps that the air compressor generates compressed air of high pressure, the compressed air is conveyed to the position of the shaft seal gap position nozzle block through the air storage tank and the air drier, the air is blasted to the shaft seal system, a high pressure air field is formed outside the shaft seal system, and the purpose of preventing the shaft seal system from leaking sealed steam outward is achieved. The device for preventing the steam turbine shaft seal from leakage is simple in structure, and the leakage problem of the steam turbine shaft seal is solved from the root.

Description

technical field [0001] The invention relates to a device and method for preventing steam leakage from the shaft seal of a steam turbine. Background technique [0002] With the continuous operation of the thermal power generation unit, the gap between the shaft seal of the steam turbine will become larger and larger, and the amount of steam leakage inside and outside the shaft seal will continue to increase, resulting in the loss of working fluid and the decrease of vacuum, resulting in a decrease in the efficiency of the steam turbine, especially the leakage of shaft seal. Contamination of steam turbine lubricating oil will cause serious damage to steam turbine shafting and cause major safety accidents. [0003] At present, in order to solve the problem of steam leakage from the shaft seal of the steam turbine, those skilled in the art usually adopt the method of improving the shaft seal system of the steam turbine itself. An air-sealed steam turbine shaft seal system is di...

AI Technical Summary

Problems solved by technology

[0002] With the continuous operation of the thermal power generation unit, the gap between the shaft seal of the steam turbine will become larger and larger, and the amount of steam leakage inside and outside the shaft seal will continue to increase, resulting in the loss of working fluid and the decrease of vacuum, resulting in a decrease in the efficiency of the steam turbine, especially the leakage of shaft seal. Contamination of steam turbine lubricating oil will cause serious damage to steam turbine shafting and cause major safety accidents

[0003] At present, in order to solve the problem of steam leakage from the shaft seal of the steam turbine, those skilled in the art usually adopt the method of improving the shaft seal system of the steam turbine itself. An air-sealed steam turbine shaft seal system is disclosed, and a Chinese patent with a publication date of November 01, 2006 and a publication number of CN2833118 discloses a new type of steam turbine shaft seal system, all of which are for the steam turbine shaft seal system itself Improvements have resulted in a complex structure of the turbine shaft seal system, making it difficult to upgrade existing steam turbines and fundamentally solve the problem of steam leakage from the turbine shaft seal

[0004] At present, there is no device with a simple structure that can fundamentally solve the steam leakage problem of the shaft seal of the steam turbine

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