Steam turbine steam valve regulating system for nuclear power plant and safety control method of steam turbine steam valve regulating system

Abstract

The invention relates to the technical field of steam turbine regulating systems for million kilowatt nuclear power plants, in particular to a steam turbine steam valve regulating system for a nuclearpower plant and a safety control method of the steam turbine steam valve regulating system. The steam turbine steam valve regulating system comprises an oil circuit unit, a GSE unit, a GRE unit and acontroller. The safety control method includes the steps of controlling a valve opening operation performed by the GSE unit and the GRE unit in response to a valve opening command of the controller,or controlling a valve closing operation performed by the GSE unit and the GRE unit in response to a valve closing command of the controller. Because the safety control method adopts the operation sequence of separate oil inlet or oil loss of the GSE unit and the GRE unit in the valve opening operation or the valve closing operation, the system oil pressure disturbance caused by excessive instantaneous fuel consumption can be effectively avoided, the effect of the oil pressure drop on the protection action of adjacent units is further weakened, and the operation of maintaining the normal working state of the system is facilitated.

Description

technical field [0001] The invention relates to the technical field of a steam turbine regulating system of a mega-kilowatt nuclear power plant, in particular to a steam valve regulating system of a steam turbine in a nuclear power plant and a safety control method thereof. Background technique [0002] Nuclear power is a kind of electric power resource recognized by the public at present. It generates heat energy from nuclear chain fission and then converts it into electricity. This process will not pollute the air or cause energy depletion. Therefore, nuclear power is widely regarded as clean, efficient, Inexhaustible new electrical energy. However, compared with other power production processes, the nuclear power production process has strict requirements on nuclear energy technology, safety operation and maintenance, and emergency dispatch. Some nuclear power accidents that seriously damage the ecological environment make the staff of nuclear power plants tense all the t...

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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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