System and method for shutdown cooling of high-temperature gas cooled reactor nuclear power station

Abstract

The invention discloses a system and a method for shutdown cooling of a high-temperature gas cooled reactor nuclear power station. The system comprises an evaporator, an evaporator outlet valve set, asteam separator, an evaporator inlet valve set, a bypass valve set, a high-pressure heater, an auxiliary steam header, a condenser, a water feeding pump and a deaerator. The method comprises the following steps: 1) steam in the auxiliary steam header is introduced in a steam side of the high-pressure heater and the deaerator to increase the water feeding temperature in an inlet of the evaporator;2) the water feeding pressure in the inlet of the evaporator is adjusted by the water feeding pump; and the water injecting flow of the evaporator is controlled by an adjusting door in the inlet of the evaporator, so that the cooling speed of the evaporator is further controlled; and the pressure of the evaporator is controlled by an adjusting door in an outlet of the evaporator; 3) a working medium in the outlet of the evaporator is discharged into the steam separator; 4) the pressure of the steam separator is controlled by a bypass adjusting valve and auxiliary steam fed in the steam separator; and 5) water in the steam separator is recovered to the main deaerator to build a two-loop water cycle to cool the evaporator.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and in particular relates to a system and method for shutdown cooling of a high-temperature gas-cooled reactor nuclear power plant. Background technique [0002] In the current high-temperature gas-cooled reactor nuclear power plant, after the emergency shutdown, the high-pressure heater and the low-pressure heater lose the heating steam source, and the temperature at the inlet of the evaporator is very different from the temperature of the feed water, so water cannot be supplied to the evaporator. If it cannot be started again, it needs a long time (currently designed to be 170 hours) to cool down before it can be started again. The currently designed method of using auxiliary steam for cooling with a small flow rate has the following problems: [0003] (1) In normal operation, the pressure inside the evaporator tube is 14Mpa, and the pressure outside the tube is 7Mpa. At high temperature...

AI Technical Summary

Problems solved by technology

[0007] (5) Water at 105°C is passed into the evaporator at 36kg / s to circulate, and the cooling speed of the evaporator is too fast;

[0009] (7) During the cooling process of the unit, the electric boiler needs to be put into use with a large load all the time, and the power consumption is large

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