Low-pressure cylinder shaft seal steam flow testing device of high-pressure and intermediate-pressure combined cylinder turbine

Abstract

The invention discloses a low-pressure cylinder shaft seal steam flow testing device of a high-pressure and intermediate-pressure combined cylinder turbine. The device comprises a shaft seal temperature reduction module, a steam outlet temperature and pressure detection module, a steam inlet temperature and pressure detection module and a steam inlet adjusting valve, wherein the shaft seal temperature reduction module is connected to a shaft seal overflow steam collecting pipe through a three-way joint, the shaft seal overflow steam collecting pipe is divided into a high-pressure and intermediate-pressure combined cylinder shaft seal overflow steam collecting pipe and a low pressure cylinder shaft seal steam inlet main pipe by the three-way joint, the steam outlet temperature and pressure detection module and the steam inlet adjusting valve are arranged on the high-pressure and intermediate-pressure combined cylinder shaft seal overflow steam collecting pipe, and the steam inlet temperature and pressure detection module is arranged on the low pressure cylinder shaft seal steam inlet main pipe. According to the low-pressure cylinder shaft seal steam flow testing device of the high-pressure and intermediate-pressure combined cylinder turbine, the flow, temperature and pressure of the device are measured, and a high-pressure and intermediate-pressure combined cylinder shaft seal overflow steam flow can be monitored, so that the size change trend of a gap between shaft seal teeth and a rotor of a steam turbine shaft seal system is supported.

Description

technical field [0001] The invention relates to the technical field of flow measurement and control of a steam turbine generator set and thermal equipment thereof, in particular to a steam flow test device for a low-pressure cylinder shaft seal of a high-medium pressure cylinder combined-cylinder steam turbine. Background technique [0002] The shaft seal system of the turbogenerator unit with high and medium pressure cylinders is an important device to prevent air from entering the cylinder and to recycle the leaked steam from the cylinder. In the start-up or low-load stage of the turbo-generator set, in order to realize the formation of vacuum in the steam chamber of the condenser, it is necessary to supply steam to the seal of the steam turbine high-medium-pressure cylinder and the seal of the low-pressure cylinder. Vacuum is formed; in the high-load stage of the turbogenerator set, as the steam flowing out from the high and medium pressure cylinders to the shaft seal inc...

AI Technical Summary

Problems solved by technology

[0003] To measure the steam flow of the shaft seal pipeline, a throttling orifice flow measuring device is installed on the steam pipeline, but the units currently in service are generally not installed with this test device

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