Sliding pressure starting system and method for high-temperature gas cooled reactor nuclear power unit

Abstract

The invention discloses a sliding pressure starting system and method for a high-temperature gas cooled reactor nuclear power unit. The system comprises a first valve group, a steam generator, a reactor and a steam-water separator, an outlet of the first valve group is connected to a first inlet of the steam generator, a first outlet of the steam generator is connected to an inlet of the steam-water separator, an outlet of the reactor is connected to a second inlet of the steam generator, and a second outlet of the steam generator is connected to an inlet of the reactor. According to the method, in the starting stage, the circulating water amount of the evaporator is matched with the reactor load, too much steam heating is not needed in the initial stage, and the power consumption of the electric boiler is low; the water consumption and the heat consumption of the unit in the starting process are relatively small; in the starting process of the unit, water supply pressure, flow and temperature are matched with unit load, control is easy, steam temperature and pressure change is gentle, and safety and stability of unit operation are facilitated.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and in particular relates to a system and method for sliding pressure start-up of a high-temperature gas-cooled reactor nuclear power unit. Background technique [0002] The currently constructed high temperature gas-cooled reactor nuclear power unit needs to maintain a pressure of about 14MPa in the evaporator at the initial stage of unit start-up, and establish a circulation flow rate of 36kg / s in the secondary circuit. The unit maintains a constant pressure of 14Mpa during start-up and operation. . [0003] The current design has the following problems: [0004] (1) During the start-up stage of the unit, the water supply to the evaporator can only be heated by the electric boiler supplying steam to the deaerator. Due to the large amount of circulating water, the electric boiler consumes a lot of power and the economy is very poor; [0005] (2) The unit consumes a lot of water and heat ...

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Problems solved by technology

[0004] (1) During the start-up stage of the unit, the water supply to the evaporator can only be heated by the electric boiler supplying steam to the deaerator. Due to the large amount of circulating water, the electric boiler consumes a lot of power and the economy is very poor;

[0005] (2) The water consumption and heat consumption of the unit are large during the start-up process;

[0006] (3) During the start-up process of the unit, it is difficult to control the feed water pressure and flow rate, which may easily cause drastic changes in the steam temperature and affect the safety and stability of the unit operation

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