Pressure fluctuation buffer device and method for opening process of main steam valve station

Abstract

The invention discloses a pressure fluctuation buffer device and method for the opening process of a main steam valve station. The upper piston in the device can move vertically under the limit of the upper spring group; the lower piston can move under the limit of the lower spring. Move in the vertical direction; there are stepped through holes inside the cylinder body, end cover and bottom cover, which are called pressure balance channels. The inlet fluid enters the upper end of the upper piston through the channel. Both the upper piston and the lower piston are coaxially fixed with adjusting hand wheels for adjusting the spring preload; the whole device is symmetrically distributed at both ends except for the pressure balance channel. The present invention utilizes the upper spring group and the lower spring to form the initial pre-tightening force on the upper piston and the lower piston. The movement can reduce the flow area nonlinearly according to the magnitude of the system pressure drop, which can adapt to different working conditions, effectively relieve the pressure drop speed, and ensure the normal operation of the rest of the valves.

Description

technical field [0001] The invention belongs to the field of a main steam valve station, and in particular relates to a pressure fluctuation buffering device and method for the opening process of a main steam valve station. Background technique [0002] With the rapid development of my country's economy, the demand for energy is increasing day by day, and energy transformation has increasingly become a consensus. As a kind of new energy, nuclear power is clean and efficient, and it is an important direction for realizing energy structure adjustment and ensuring energy demand in the future. As one of the key overpressure protection equipment in the main steam system of the secondary circuit of the nuclear power plant, the main steam valve station is located outside the containment, which is of great significance to the safe and reliable operation of the main steam system. In the event of upstream (towards the steam generator) and downstream (towards the steam turbine) failur...

AI Technical Summary

Problems solved by technology

When the pre-isolation valve or the main steam safety valve is opened, the pressure at the bottom of the main steam isolation valve will drop sharply. When the pressure drops to a certain value, the main steam isolation valve will be closed, cutting off the connection with the upstream, which may cause an emergency shutdown of the nuclear power plant. Heap and other accidents

At present, there are few studies on the main steam valve station

Although there are some pressure buffer devices, they apply to valves that work differently from the main steam valve station

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