Pressurized water reactor nuclear power unit secondary circuit thermodynamic system self-adaptive steam supply system and method

Abstract

The invention discloses a pressurized water reactor nuclear power unit secondary circuit thermodynamic system self-adaptive steam supply system and method. By means of the system and the method, a main steam bypass can be self-adaptively put into use or cut out to supply a heating steam source to a low-pressure heater, a deaerator and a high-pressure heater according to secondary circuit thermodynamic parameters in the unit start-stop and normal running process, the defect of long-time hot stand-by duty of an auxiliary boiler is avoided, energy cascade recycling is achieved, meanwhile the reliability, stability and safety are high, and the power consumption is low.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and relates to an adaptive steam supply system and method for a secondary circuit thermal system of a pressurized water reactor nuclear power unit. Background technique [0002] Pressurized water reactor (PWR), as a mature reactor type, has been widely used at present. The thermal system of the secondary circuit of the pressurized water reactor nuclear power unit includes a steam generator, a steam turbine, a steam-water separation reheater, a condenser, a low-pressure heater, a deaerator and a high-pressure heater, as well as pumps, valves and connecting pipes. The general design scheme of the thermal system of the secondary circuit is: after the condensed water in the condenser is heated by the low-pressure heater, the deaerator and the high-pressure heater in sequence, the water temperature at the inlet of the secondary side of the steam generator meets the operating requirements of the ...

AI Technical Summary

Problems solved by technology

[0008] e) When the unit is in normal operation, the auxiliary boiler needs to be in the hot standby state for a long time, so that the deaerator and shaft seal steam source can be provided during the normal stop of the unit. The long-term hot standby state is not conducive to the safe and stable operation of the auxiliary boiler. At the same time It also increases the energy consumption of the auxiliary boiler;

[0009] f) In the non-stop stacking operation condition, when the steam turbine is shut down in an emergency, all levels of extraction steam are lost, the heating steam source of the high-pressure heater, low-pressure heater and deaerator is lost instantaneously, and the temperature of the feed water at the evaporator inlet drops sharply, which is extremely It is easy to cause the overcooling of the primary circuit and cause the reactor non-shutdown accident

Images