A steam valve regulating system for a steam turbine in a nuclear power plant and a safety control method thereof

Abstract

The present invention relates to the technical field of a steam turbine regulation system of a million-kilowatt nuclear power plant, in particular to a steam turbine valve regulation system of a nuclear power plant and a safety control method thereof, wherein the steam turbine valve regulation system includes an oil circuit unit, a GSE unit, a GRE unit and a controller, The safety control method includes controlling the valve opening operation of the GSE unit and the GRE unit in response to the valve opening instruction of the controller, or controlling the valve closing operation of the GSE unit and the GRE unit in response to the valve closing instruction of the controller. Since the safety control method adopts the operation sequence of the GSE unit and the GRE unit to separate the oil intake or oil loss during the valve opening operation or the valve closing operation, it can effectively avoid the system oil pressure disturbance caused by the instantaneous excessive oil consumption, and It further weakens the effect of oil pressure drop on the protection action of adjacent units, which is beneficial to maintain the normal working state of the system.

Description

technical field [0001] The invention relates to the technical field of a 1 million kilowatt-class nuclear power plant steam turbine regulating system, in particular to a nuclear power station steam turbine steam valve regulating system and a safety control method thereof. Background technique [0002] Nuclear power is a kind of power resource that has been recognized by the public. It is converted into electrical energy by chain fission of atomic nuclei, which will not pollute the air or cause energy depletion. Inexhaustible new energy. However, compared with other power production processes, the nuclear power production process has strict requirements on nuclear energy technology, safe operation and maintenance, and emergency dispatch. Some nuclear power accidents that seriously damage the ecological environment make the staff of the nuclear power station tense at all times. It is necessary to ensure that The absolute safety of nuclear power production. [0003] At presen...

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Problems solved by technology

[0004] In the working condition test, the above-mentioned valve adjustment device may have valve misoperation, which directly affects the safe working state of the steam turbine, and makes the nuclear power unit have the risk of tripping the machine and stacking

After investigation, it was found that the unstable oil pressure in the pipeline was the direct factor leading to the malfunction of the valve, especially when the control system instructed the GRE unit and the GSE unit to execute the operation command to open the valve at the same time, the fuel consumption of the GRE oil motor and the GSE oil motor Continuously increasing, causing oil pressure disturbance in the protection oil pipeline, oil return pipeline and power oil pipeline; when the oil pressure of a single pipeline drops greatly, the oil pressure of the entire oil system will be lowered, and even the adjacent valves will be triggered The hydraulic protection action will cause more steam valves to malfunction, especially when the steam valves are closed by mistake, it will greatly affect the working status of the steam turbine

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