A nuclear power plant generator three-flow ring sealing oil system and its airside sealing oil circuit

Abstract

The invention discloses a triple flow ring seal oil system for a nuclear power plant generator and an air side seal oil loop thereof. The air side seal oil loop includes an air side main oil tank, anair side oil pump, an oil cooler, a filter, a check valve, an energy accumulator loop, and an oil hydrogen pressure difference regulating valve which are installed on a main pipeline and are connectedin series along a flow direction of seal oil in the main pipeline, at least one spare air side oil pump connected in parallel with the air side oil pump, a side pipeline, and a pressure reducing valve installed on the side pipeline. The oil hydrogen pressure difference regulating valve is used for adjusting oil pressure of the seal oil in the main pipeline of the air side seal oil loop by using amain road adjusting mode to maintain the oil pressure in a generator sealing pad to be higher than hydrogen air pressure in the generator. The triple flow ring seal oil system provided by the invention solves the problem of fluctuation of an oil hydrogen pressure difference in variable working conditions, also simultaneously solves the problem that the oil hydrogen pressure difference is lower than 0 when a power-losing accident condition occurs, eliminates a hidden trouble of hydrogen leakage of the generator, and has a significant promotion role in ensuring safe, economic and stable operation of a set.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant debugging, in particular to a three-flow ring sealing oil system of a nuclear power plant generator and an empty side sealing oil circuit thereof. Background technique [0002] The generator sealing oil system is to supply oil to the generator sealing tile, so that the oil pressure is higher than the hydrogen pressure in the generator, so as to prevent the hydrogen in the generator from leaking along the gap between the rotating shaft and the sealing tile, and the air entering the generator to reduce the purity of the hydrogen. Reduce, but also prevent excessive oil pressure from causing a large amount of oil into the generator. [0003] The three-flow ring seal oil system generally includes: an air-side seal oil circuit, a hydrogen-side seal oil circuit, and a vacuum-side seal oil circuit. Among them, the airside sealing oil circuit is generally composed of airside main oil tank, thr...

AI Technical Summary

Problems solved by technology

However, the response speed of the oil-hydrogen pressure difference valve cannot be increased infinitely, and too high a response speed is not conducive to the stability of the oil-hydrogen pressure difference

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