Inner water-cooled generator stator anti-vapor blocking device and method

Abstract

The invention provides an inner water-cooled generator stator anti-vapor blocking device which is connected with a stator waterway of a generator cooling system. The anti-vapor blocking device comprises a temperature measurement element, a flowmeter and a pressure release unit. The temperature measurement element is arranged at a 12-o'clock position of a parallel ring top end of the stator and used for predetermining occurrence of a vapor blocking phenomenon. The flowmeter is arranged on an outer wall of a small conflux pipe and used for predetermining occurrence of the vapor blocking phenomenon. A flow signal of the flowmeter and a measurement signal of the temperature measurement element are led outside the generator by a generator base box terminal and are jointly sent to a generator monitoring system. The pressure release unit is connected to the 12-o'clock position of the parallel ring top end of the stator through a pipe and used for releasing vapor-blocked gas. By monitoring temperature and water pressure of the parallel ring top end of the stator and the system flow, accidents that a stator coil is overheated and winding bars are burned due to vapor blocking of the generator can be timely and effectively prevented, and the equipment operation reliability is improved.

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.

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