Halt leak checking mechanism of turbine vacuum system

Abstract

The invention provides a machine-stopping leak hunting mechanism for a steamer vacuum system, belonging to the technical field of detecting vacuum degree of the steamer vacuum system. The structure of the invention includes a tube plate arranged in a condenser and a cooling tube arranged on the tube plate. The machine-stopping leak hunting mechanism for a steamer vacuum system is characterized in that at least one end of the cooling tube is additionally provided with an abnormal situation display or indicating device and the other end which is not additionally provided with the device is sealed by a sealing plug. The display or indicating device has various structure modes, can be formed by a sealing plug with a through hole and a soft air cell, and can also directly select a pressure display meter, or an acousto-optic alarming device or a fluid column indicating device in the prior art to build the vacuum system into negative pressure environment or positive pressure environment and which part of the vacuum system is a leaking point is judged by observing the display or indicating device under the environment. Compared with the prior art, the machine-stopping leak hunting mechanism for a steamer vacuum system of the invention has the advantages of simple leak hunting mode, convenient operation, high leak hunting accuracy and so on. The machine-stopping leak hunting mechanism can be used for checking the cooling tube of a condenser and can also carry out leak hunting on the other parts of the vacuum system such as a valve, and so on.

Description

(1) Technical field [0001] The invention relates to a vacuum degree inspection technology of a steam turbine vacuum system, in particular to a leak detection mechanism for a vacuum system under a negative pressure environment or a positive pressure environment. (2) Technical background [0002] The condenser of the condensing steam turbine in a thermal power plant maintains a high vacuum in order to improve power generation efficiency and reduce power generation steam consumption. Due to many defects in the equipment of the steam turbine vacuum system, such as many valves, leakage of flanges, and lax valve closure, air enters the vacuum system, reducing the vacuum degree and increasing the steam consumption of power generation. Because the shaft end of the steam turbine in the prior art is a steam seal, when the steam turbine is shut down for maintenance, the steam seal will temporarily lose its effect, and the air will enter the vacuum system from the shaft end of the steam...

AI Technical Summary

Problems solved by technology

Due to many defects in the equipment of the steam turbine vacuum system, such as many valves, leakage of flanges, and lax valve closure, air enters the vacuum system, reducing the vacuum degree and increasing the steam consumption of power generation.

Because the shaft end of the steam turbine in the prior art is a steam seal, when the steam turbine is shut down for maintenance, the steam seal will temporarily lose its effect, and the air will enter the vacuum system from the shaft end of the steam turbine, and the air extractor can only keep the vacuum system very small. Vacuum degree, it is difficult to detect the leakage point of the condenser copper pipe, equipment valve, etc. If there is a leakage point in the condenser copper pipe, the cooling water will mix with the condensed water, which will deteriorate the water quality and scale the boiler; There are leakage points in valves and other places, which will cause air to enter the vacuum system and reduce the vacuum degree of the vacuum system; if steam is sent to seal, not only will the steam be wasted, but the steam will increase the temperature of the steam turbine and increase the cooling time of the steam turbine barring

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