Internal leakage monitoring system for steam trap of gas turbine power plant

Abstract

The invention relates to a gas turbine power plant drain valve inner leakage monitoring system, a drain valve is arranged on a pipeline, the pipeline is divided into a valve front pipeline and a valve rear pipeline, the system comprises an integrated block, a thermocouple and a controller, the integrated block is provided with a heat conduction face matched with the outer wall face of the valve rear pipeline, the heat conduction face of the integrated block is attached to the outer wall face of the valve rear pipeline, and the thermocouple is connected with the controller. A blind hole matched with the metal temperature sensing part of the thermocouple in size is further formed in the integrated block, the metal temperature sensing part of the thermocouple is inserted into the blind hole, and the output end of the thermocouple is connected to the controller and further fastened to the valve rear pipeline through a clamping plate. Compared with the prior art, heat conduction between the thermocouple and the outer wall face of the behind-valve pipeline is achieved through the specially-designed integrated block, the thermocouple is protected while the heat conduction performance between the thermocouple and the behind-valve pipeline is improved, the accuracy of temperature measurement is improved, and then the accuracy of inner leakage monitoring is improved.

Description

technical field [0001] The invention relates to the field of gas turbine power generation, in particular to a monitoring system for internal leakage of steam traps in gas turbine power plants. Background technique [0002] As a peak-shaving power plant, a gas turbine power plant mainly operates daily and night-stop. In order to meet the needs of peak shaving, the unit needs to be started and stopped frequently. The steam traps in the entire thermal system are opened and closed many times a day. Avoid internal leakage. If multiple steam traps in the system leak internally, a large amount of high-temperature and high-pressure steam will be discharged to the expansion tank, causing overflow and becoming a source of danger. At the same time, if the internal leakage of the trap is not found and dealt with in time, the valve core will continue to blow out, resulting in equipment damage and economic losses. [0003] Some technicians have proposed that it is possible to judge whet...

AI Technical Summary

Problems solved by technology

If multiple steam traps in the system leak internally, a large amount of high-temperature and high-pressure steam will be discharged to the expansion tank, causing overflow and becoming a source of danger.

At the same time, if the internal leakage of the trap is not found and dealt with in time, the valve core will continue to blow out, causing equipment damage and economic losses

[0003] Some technicians have proposed that it is possible to judge whether the internal leakage of the trap has occurred by monitoring the temperature of the pipeline behind the valve. However, if the thermocouple is directly connected to the outer wall of the pipeline behind the valve, the heat conduction effect will be poor. And it is easy to fall off or be damaged in vibration, and after peeling off, the output signal of the thermocouple cannot be distinguished from the signal when the trap is normal, so the accuracy of internal leakage detection is not high, and the entire monitoring system cannot run stably and reliably

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