Liquid level control system and method for nuclear power plant circulation water pump pit

Abstract

The invention discloses a liquid level control system and method for a nuclear power plant circulation water pump pit. The system comprises a main submersible sewage pump (1) with a first liquid levelswitch (11) and a standby submersible sewage pump (2) with a second liquid level switch (21), wherein the first liquid level switch is used for starting the main submersible sewage pump when the liquid level value in the pump pit is greater than or equal to a second liquid level value, or shutting down the main submersible sewage pump when the liquid level value in the pump pit is smaller than orequal to a first liquid level value, and the second liquid level value is greater than the first liquid level value; and the second liquid level switch is used for starting the standby submersible sewage pump when the liquid level value in the pump pit is greater than or equal to a fourth liquid level value, or shutting down the standby submersible sewage pump when the liquid level value in the pump pit is smaller than or equal to a third liquid level value, and the third liquid level value is smaller than the fourth liquid level value but greater than the second liquid level value. Accordingto the system provided by the invention, the liquid level in the pump pit is controlled by multiple gears, the situation that water flows into a bearing chamber of a circulation water pump when the liquid level in the pump pit is too high is prevented, and the risk of damage to the circulation water pump is eliminated.

Description

technical field [0001] The invention relates to the technical field of liquid level control, in particular to a liquid level control system and method for a circulating water pump pit of a nuclear power plant. Background technique [0002] The circulating water of the nuclear power plant is the cold source of the closed cooling water of the conventional island of the nuclear power plant, and its normal operation is directly related to the normal power generation of the conventional island of the nuclear power plant. Generally, a circulating water pump is installed in the pump pit to make the circulating water run normally. [0003] However, if the liquid level in the pump pit of the circulating water pump of the nuclear power plant is not effectively controlled, causing the liquid level to be too high, it may cause water to enter the bearing chamber of the circulating water pump, resulting in damage or failure of the circulating water pump, which in turn affects the reliabil...

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Problems solved by technology

[0003] However, if the liquid level in the pump pit of the circulating water pump of the nuclear power plant is not effectively controlled, causing the liquid level to be too high, it may cause water to enter the bearing chamber of the circulating water pump, resulting in damage or failure of the circulating water pump, which in turn affects the reliability of the power generation work of the conventional island of the nuclear power plant

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