Straight-flow steam generator pressure control method and system

Abstract

The invention discloses a straight-flow steam generator pressure control method and system. The system comprises a straight-flow steam generator, a steam turbine, a water supply adjusting valve set, a pressure deviation control channel, a first control module, a steam-water flow deviation control channel, a second control module and a load demand control channel used for measuring a steam inlet pressure value of the steam turbine; and a third control module which is used for comparing the steam inlet pressure value with a switching threshold value and selectively outputting high and low load signals. The water supply adjusting valve set comprises a first valve and a second valve, the first valve is selectively opened or closed according to high and low load signals, and the second valve is selectively opened or closed according to the high and low load signals. According to the straight-flow steam generator pressure control method and system, the requirements for coarse adjustment and fine adjustment are distinguished through the third control module, so that opening and closing of the first valve and the second valve are controlled correspondingly, and the requirements for coarse adjustment and fine adjustment are met at the same time.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a pressure control method and system for a once-through steam generator. Background technique [0002] The once-through steam generator is a key device in the design of the reactor. It provides enough feed water for the steam generator to export the heat in the coolant of the primary circuit, so that it can generate saturated steam to supply the power plant of the secondary circuit. In the design of the pressurized water reactor nuclear power plant, the steam generator pressure is controlled near the design value through the once-through steam generator pressure automatic control system, so as to ensure the normal and stable operation of the reactor. [0003] In the existing disclosed technology, pressure deviation and steam-water flow deviation are usually used to control the outlet pressure of the once-through steam generator, without taking into account the mismatch betw...

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Problems solved by technology

[0003] In the existing public technology, the pressure deviation and the steam-water flow deviation are usually used to control the outlet pressure of the once-through steam generator, without taking into account the fast response characteristics of the once-through steam generator and the Reactor Core Response Lag Mismatch

[0004]The disadvantage of the existing technology is that the control system has high requirements for the actuator, and the valve action range is relatively large, which is not conducive to system stability

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