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

Abstract

The invention discloses a pressure fluctuation buffering device and method for an opening process of a main steam valve station. An upper piston in the device can move in the vertical direction under limiting of an upper spring set; a lower piston can move in the vertical direction under the limitation of a lower spring; step type through holes are arranged in a cylinder body, an end cover and a bottom cover and are called pressure balance channels; inlet fluid enters the upper end of the upper piston through the channel; adjusting hand wheels are coaxially fixed on the upper piston and the lower piston and are used for adjusting the pre-tightening force of the spring; and except the pressure balance channel, the whole device is symmetrically distributed at two ends. The upper spring set and the lower spring are used for forming initial pretightening force on the upper piston and the lower piston, when a downstream valve is opened to enable fluid pressure to rapidly drop, stress balance of the upper piston and the lower piston is broken, meanwhile, the upper piston and the lower piston move towards the center of a flow channel, the flow area is nonlinearly reduced according to the drop amplitude of system pressure, different working conditions can be adapted, the pressure reduction speed is effectively reduced, and normal operation of other valves is guaranteed.

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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