Anti-vapor blockage device and method for stator of water internally cooled generator

Abstract

An anti-steam blockage device for the stator of a water-internal-cooled generator, which is connected to the stator waterway on the generator cooling system; It is used to predict the occurrence of steam blockage; the flowmeter is arranged on the outer wall of the small confluence pipe to predict the occurrence of steam blockage; the flow signal of the flowmeter and the measurement signal of the temperature measuring element pass through the generator respectively. The base box terminal is led out of the machine and connected to a generator monitoring system; the pressure release unit is connected to the 12 o'clock position on the top of the parallel ring through a pipeline, and is used to release the gas blocked by steam. Its advantages are: by monitoring the temperature and water pressure at the top of the stator parallel ring, and the system flow, it can effectively prevent the overheating of the stator coil and the burning of the wire rod caused by the steam blockage of the generator in a timely and effective manner, and improve the reliability of the equipment operation. sex.

Description

technical field [0001] The invention relates to the technical field of water internally cooled generators, in particular to a stator steam block prevention device and method thereof for internally water cooled generators. Background technique [0002] In recent years, there have been many abnormal commissioning accidents in China caused by the blockage of the waterway of the stator ring lead of the 600MW turbogenerator, which caused the generator lead to be burned and even the entire stator bar to be scrapped, causing serious losses. Accident inspection did not find foreign matter and copper scale in the two burnt ring leads, but the diameter of the external connecting pipe of the generator was smaller than the design value. After unanimous analysis by the manufacturer and the operating unit, it was believed that the insufficient water flow of the ring lead was the cause of power generation. The main cause of generator failure caused by steam blockage in the stator cooling s...

AI Technical Summary

Problems solved by technology

[0004] During normal operation, a fluid-solid conjugate heat transfer phenomenon occurs in the ring lead, that is, while the cooling water cools the heat source copper pipe, it is also heated up, and the water temperature gradually increases from the inlet to the outlet along the pipeline, and the The temperature and heat flux are restricted by the interaction between the fluid and the wall surface. Hydrogen gas precipitated from the cooling water of the ring lead tube accumulates at the top of the ring lead tube. A large amount of hydrogen gas accumulation may cause the gas blockage of the ring tube.

Images