Feedwater steam driven pump high flow control method and device for auxiliary feedwater system

Abstract

The invention belongs to a pump body flow control technology, and specifically relates to a feedwater steam driven pump high flow control method and device for an auxiliary feedwater system. The method comprises the following steps of: measuring flow of the outlet of a feedwater steam driven pump, comparing a flow signal of real-time measurement and setting maximum flow limiting value in the control system, when the measured flow is greater than or equal to the set maximum flow limiting value, controlling a steam turbine air inlet valve of the steam driven pump, turning down the air inlet valve, reducing the rotation speed of a steam turbine, and dropping the flow of the outlet of the feedwater steam driven pump to a set value. The auxiliary feedwater system feedwater steam driven pump high flow control method and the control device provided by the invention solve the problem that the steam driven pump with a fixed rotation speed easily causes large flow and cannot meet a system performance requirement under the condition of the low pressure of the pump outlet, the oversize flow is prevented from carrying out cavitation of the pump, and the pump is damaged so as to cause the auxiliary feedwater defuctionalization.

Description

technical field [0001] The invention belongs to the flow control technology of a pump body, in particular to a large flow control method and a control device of a water supply steam-driven pump in an auxiliary water supply system. Background technique [0002] Auxiliary water supply system is an important safety special system in PWR nuclear power plant. It ensures sufficient water supply to the steam generators to remove residual heat from the core in the event of an accident during reactor operating mode. In the design of the current feedwater pump, there are two steam-driven pumps and two electric pumps, and the head of the currently selected auxiliary feedwater steam-driven pump is greater than the performance required by the designed auxiliary water supply system at the maximum flow point, so it is necessary Use the speed reduction method to adjust the performance of this working point to meet the requirements of the auxiliary water supply system. [0003] At the same...

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Problems solved by technology

[0003] At the same time, if the outlet pressure of the pump is too low and the flow rate is too large, it will cause cavitation of the pump, which will cause great damage to the pump itself, resulting in the loss of the water supply function and the unavailability of the auxiliary water supply system.

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