Generator hydrogen cooler leakage detection method

Abstract

The invention discloses a generator hydrogen cooler leakage detection method. The method includes the following steps that: gas replacement is performed after the hydrogen-cooled generator stops operating, so that the hydrogen of the hydrogen cooler is replaced with air; the water entering door of the hydrogen cooler is closed, the water return door of the hydrogen cooler is opened, and residual water inside the hydrogen cooler is emptied; the cover plate of the water chamber of the hydrogen cooler is opened, and dirt inside the water chamber of the hydrogen cooler is cleaned; and air is injected into the stator chamber of the generator, so that the pressure of the air inside the stator chamber of the generator can be raised to rated hydrogen pressure. With the method of the invention adopted, the hydrogen cooler is not required to be drawn out from the body of the generator so as to be subjected to leakage detection during a leakage detection process, and therefore, the workload of the leakage detection can be greatly decreased. The leakage detection method is precise and direct and can be understood at a glance, so that omissions can be avoided; the efficiency of the method is shigh; and therefore, a work period can be shortened. Since the hydrogen cooler is not needed to be completely disassembled, some gaskets do not need to be replaced, and therefore, maintenance costs can be saved.

Description

technical field [0001] The invention relates to the technical field of cooler leak detection, in particular to a method for leak detection of a generator hydrogen cooler. Background technique [0002] The hydrogen cooler is an important part of the hydrogen-cooled generator. With the natural deterioration of the equipment, coupled with the influence of poor cooling water quality during operation, corrosion of copper pipes, vibration of the machine base and other factors, leakage is inevitable. Leakage of the water pipe of the hydrogen cooler is one of the main reasons for the internal hydrogen leakage of the generator, which directly threatens the operation safety of the generator. The traditional leak detection method is to shut down the unit, replace the hydrogen with hydrogen, and then extract the cooler from the generator body, and carry out water pressure to confirm. Due to the large number of cooling water pipes in the cooler, and the cooling fins are mostly coiled sp...

AI Technical Summary

Problems solved by technology

[0005] 1. The workload is heavy, there are many bolts in the gas and water chambers of the hydrogen cooler, and the extraction and reassembly of the hydrogen cooler and the production of gaskets all require a lot of manpower

[0006] 2. The cycle is long. It usually takes about 7 days from hydrogen replacement to reinstallation. In addition, the extraction of hydrogen cooler will change the hydrogen sealing system of the generator. If necessary, a 48-hour overall airtight test of the generator is required.

[0007] 3. The efficiency of leak detection is extremely low, the leak point can only be judged by visual observation, and sometimes the location of the leaking copper pipe cannot be found

The hydrogen cooler basically uses "finned" heat sinks installed on the cooling copper pipes. The cooling pipes are relatively dense, and it is difficult to see the leakage of the cooling pipes in some central areas. Part of the heat sinks can be observed by destroying them. There is also the risk of picking up the cooling pipe to create new leaks, and the leak detection effect is not good

[0008] 4. Many special tools are used. Special blocking plates, joints, etc. need to be prepared during the hydrostatic test. Repeat hydraulic check to confirm

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