Method for adjusting power of auxiliary electric boiler of nuclear power plant

Abstract

A method for adjusting the power of an auxiliary electric boiler of a nuclear power plant comprises the steps that the operation liquid level of the boiler is set, and a first boiler water dosing pump and a second boiler water dosing pump are started to adjust the conductivity and the pH value of the boiler; the boiler is started to operate, the boiler water liquid level of the boiler is kept at the operation liquid level, and the pH value and conductivity of the boiler water are monitored; the liquid level of the boiler is kept constant, the output power of the boiler is adjusted by adjusting the boiler water conductivity of the boiler, when the boiler water conductivity is improved, the boiler power is improved, and when the boiler water conductivity is reduced, the boiler power is reduced; and when shutdown is needed, the boiler conductivity is adjusted to be reduced to the shutdown conductivity, the boiler blow-down valve and the boiler water replenishing valve are closed, and the boiler is shut down. The graphite electrode of the boiler is immersed in boiler water, the dry burning phenomenon is avoided, loss of the graphite electrode and falling of graphite powder are reduced, the service life of the electrode is prolonged, and safe, economical and stable operation of the boiler is guaranteed.

Description

technical field [0001] The invention relates to the technical field of water chemistry in a high-temperature gas-cooled reactor nuclear power plant, in particular to a method for regulating the power of an auxiliary electric boiler in a nuclear power plant. Background technique [0002] The nuclear power plant is equipped with an auxiliary electric boiler system, which uses a high-voltage electrode boiler to meet the needs of unit startup and emergency shutdown. The load of the high-voltage electrode boiler is related to the boiler liquid level and the conductivity of the furnace water. The higher the boiler liquid level and the higher the conductivity, the greater the power of the electric boiler. Conversely, the lower the power of the electric boiler. [0003] The regulation of electric boiler power in nuclear power plants adopts the constant conductivity mode, that is, to keep the conductivity constant, and adjust the output power of the boiler by adjusting the level of t...

AI Technical Summary

Problems solved by technology

This adjustment method has great safety hazards when the boiler is running at low power

When the boiler is running at low power (less than 20% of rated power), the liquid level of the boiler is at a low level. At this time, most of the graphite electrodes of the boiler are exposed to the air, forming dry burning, resulting in increased loss of graphite electrodes, and a large amount of graphite If the powder falls off, it is easy to jam the boiler level gauge, causing the boiler power to continue to increase and eventually tripping

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