CN214198626U

CN214198626U - Starting water supply system for passive nuclear power plant

Info

Publication number: CN214198626U
Application number: CN202022679531.1U
Authority: CN
Inventors: 缪正强; 马柏松; 庄亚平
Original assignee: Shandong Nuclear Power Co Ltd
Current assignee: Shandong Nuclear Power Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-09-14
Anticipated expiration: 2030-11-18

Abstract

The utility model discloses a start water supply system for passive nuclear power plant, its characterized in that: the steam-driven water supply device comprises a condensation water tank, a starting water supply device, a pressure accumulation device and a steam generating device, wherein the starting water supply device comprises an electric water supply pump and a steam-driven water supply pump; the pressure accumulating device stores cooling water inside, and a water outlet of the pressure accumulating device is connected with a water inlet of the steam generating device and used for supplying the cooling water to the steam generating device to maintain the liquid level of the steam generating device when the liquid level in the steam generating device is lower than a set value. The utility model discloses an adopt the steam-operated feed-water pump and set up the pressure storage tank and supply water to steam generator, strengthened the reliability that starts the water supply system and supply water, reduced the passive reactor core cooling system and started the probability.

Description

Starting water supply system for passive nuclear power plant

Technical Field

The utility model relates to a start-up water supply system for passive nuclear power plant.

Background

In passive nuclear power plants such as AP1000, CAP1400 and the like, a water supply system is started to supply water to a steam generator and maintain the liquid level of the steam generator under certain working conditions. If the liquid level of the steam generator cannot be successfully maintained and is reduced to a certain setting value, a passive core cooling system of the power plant is started to emergently discharge the core decay heat in a passive mode.

The existing starting water supply system generally adopts an electric pump to supply water, the electric pump needs to be supported by an alternating current power supply during operation, and under the whole plant power-off working condition (loss of external alternating current power supply superposition standby diesel generating set failure), the electric pump cannot be started, and the starting water supply system cannot maintain the liquid level of a steam generator, so that the passive core cooling system is started. However, the number of times of starting the passive core cooling system is limited in the service life of the power plant, and unnecessary starting of the passive core cooling system is reduced as much as possible.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the problem that the passive core cooling system has to be started due to the fact that an existing starting water supply system cannot be started to maintain the liquid level of a steam generator under the power-off working condition is solved.

In order to solve the problem, the technical scheme of the utility model a start-up water supply system for passive nuclear power plant is provided, its characterized in that: the steam-driven water supply device comprises a condensation water tank, a starting water supply device, a pressure accumulation device and a steam generating device, wherein the starting water supply device comprises an electric water supply pump and a steam-driven water supply pump; the pressure accumulating device stores cooling water inside, and a water outlet of the pressure accumulating device is connected with a water inlet of the steam generating device and used for supplying the cooling water to the steam generating device to maintain the liquid level of the steam generating device when the liquid level in the steam generating device is lower than a set value.

Preferably, the pressure accumulating device is a pressure accumulating tank, and high-pressure gas is stored in the pressure accumulating tank and used for maintaining the pressure of cooling water in the pressure accumulating tank.

Preferably, an electric valve is arranged on a water outlet pipeline of the pressure storage tank.

Preferably, the electric water feeding pump comprises a first starting water feeding pump and a second starting water feeding pump, the steam generating device comprises a first steam generator and a second steam generator, the first starting water feeding pump, the second starting water feeding pump and the steam-driven water feeding pump are connected with water inlets of the first steam generator and the second steam generator through a water feeding main pipe, and steam outlets of the first steam generator and the second steam generator are connected with an air inlet of the steam-driven water feeding pump.

Preferably, an outlet pipeline of the first starting feed water pump is provided with a first pump outlet check valve and a first isolation valve; an outlet pipeline of the starting feed pump II is provided with a pump outlet check valve II and an isolation valve II; and an outlet check valve III and an isolation valve III are arranged on an outlet pipeline of the pneumatic feed water pump.

Preferably, a first starting water supply regulating valve, a first check valve and a first starting water supply isolating valve are arranged on a water inlet pipeline of the first steam generator; and a water inlet pipeline of the steam generator II is provided with a starting water supply regulating valve II, a check valve II and a starting water supply isolation valve II.

Preferably, the steam outlets of the first steam generator and the second steam generator are respectively connected with the air inlet of the steam-driven feed water pump through a first main steam isolation valve and a second main steam isolation valve.

Preferably, the high pressure gas is high pressure nitrogen.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model adopts the steam feed pump to supply water to the steam generator, thereby avoiding the problem that the steam generator can not maintain the liquid level to start the passive reactor core cooling system under the working condition of the power failure of the whole plant; the steam-driven water feeding pump provides power through the steam generator, an additional power device is not required to be introduced, a recyclable closed-loop system is formed, and high efficiency and energy conservation are achieved; the pressure accumulation box is arranged to supply water to the steam generator, and under the condition that the electric water feeding pump and the steam-driven water feeding pump are unavailable, the pressure accumulation box can maintain the liquid level of the steam generator within a certain time, so that time is won for workers to maintain related equipment to recover the normal operation of the electric water feeding pump and the steam-driven water feeding pump; the reliability of water supply of the starting water supply system is enhanced through the measures, and the starting probability of the passive core cooling system is reduced.

Drawings

FIG. 1 is a schematic view of a startup water supply system for a passive nuclear power plant according to the present invention;

description of reference numerals:

1-a condensation water tank; 2-starting a water supply pump I; 3-starting a water feeding pump II; 4-pump outlet check valve I; 5-pump outlet check valve II; 6, isolating the first valve; 7-a second isolation valve; 8-a water supply main pipe 8; 9-starting a water supply regulating valve I; 10-starting a water supply regulating valve II; 11-a check valve I; 12-check valve two; 13-starting a first water supply isolation valve; 14-starting a water supply isolation valve II; 15-a first steam generator; 16-a second steam generator; 17-a primary steam isolation valve one; 18-primary steam isolation valve two; 21-steam feed water pump; 22-Pump Outlet check valve III; 23-isolation valve III; 24-electrically operated valve; 25-pressure accumulation box.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the utility model relates to a start-up water supply system for passive nuclear power plant includes condensate tank 1, start water supply installation, pressure accumulator and steam generator, start water supply installation and include electronic feed pump and steam-operated feed pump 21, electronic feed pump is including starting feed pump one 2 and starting feed pump two 3, steam generator includes steam generator one 15 and steam generator two 16, start feed pump one 2, start feed pump two 3, steam-operated feed pump 21 is connected with the water inlet of steam generator one 15 and steam generator two 16 through the female pipe 8 that feeds water. The steam outlets of the first steam generator 15 and the second steam generator 16 are respectively connected with the air inlet of the steam feed water pump 21 through a first main steam isolation valve 17 and a second main steam isolation valve 18 to provide power for the steam feed water pump 21.

The outlet pipeline of the first starting water-feeding pump 2 is provided with a first pump outlet check valve 4 and a first isolation valve 6, the outlet pipeline of the second starting water-feeding pump 3 is provided with a second pump outlet check valve 5 and a second isolation valve 7, and the outlet pipeline of the steam-driven water-feeding pump 21 is provided with a third pump outlet check valve 22 and a third isolation valve 23. And a starting feed water regulating valve I9, a check valve I11 and a starting feed water isolating valve I13 are arranged on a water inlet pipeline of the steam generator I15, and a starting feed water regulating valve II 10, a check valve II 12 and a starting feed water isolating valve II 14 are arranged on a water inlet pipeline of the steam generator II 16.

Under the working condition of station blackout, the alternating current power supply is lost, the first starting water feeding pump 2 and the second starting water feeding pump 3 cannot be started, and at the moment, the steam generated by the first steam generator 15 and the second steam generator 16 drives the steam-driven water feeding pump 21 to operate, so that water is supplied to the first steam generator 15 and the second steam generator 16, and the liquid levels of the water are maintained.

The pressure accumulating device is a pressure accumulating box 25 and is connected with the water inlets of the first steam generator 15 and the second steam generator 16 through a water supply main pipe 8. The pressure storage tank 25 stores a certain amount of cooling water, the water quality of which is consistent with that of the condensation water tank 1, and the pressure of the condensation water tank is maintained by high-pressure nitrogen. In addition, an electric valve 24 is provided at the outlet of the accumulator tank 25, as shown in FIG. 1. When the starting of the water feeding pumps 2 and 3 fails and the steam-driven water feeding pump 21 is started, the electric valve 24 is automatically opened when the liquid level of any steam generator is lower than a certain set value, cooling water is provided for the first steam generator 15 and the second steam generator 16 by means of high-pressure nitrogen, the liquid levels of the first steam generator 15 and the second steam generator 16 are maintained, and the situation that the liquid levels of the first steam generator 15 and the second steam generator 16 are reduced to a certain set value possibly when the steam-driven water feeding pump 21 is started successfully, a passive core cooling system is automatically started already, and the purpose of avoiding the starting of the passive core cooling system cannot be achieved.

In addition, under the condition that the first starting water feeding pump 2, the second starting water feeding pump 3 and the steam-driven water feeding pump 21 are unavailable, the pressure storage tank 25 can maintain the liquid levels of the first steam generator 15 and the second steam generator 16 within a certain time, and time is won for the maintenance of related equipment by workers to recover the normal operation of the first starting water feeding pump 2, the second starting water feeding pump 3 or the steam-driven water feeding pump 21.

Claims

1. A start-up water supply system for a passive nuclear power plant, characterized by: the steam-driven water supply device comprises a condensation water tank (1), a starting water supply device, a pressure accumulation device and a steam generating device, wherein the starting water supply device comprises an electric water supply pump and a steam-driven water supply pump (21), the condensation water tank (1) is connected with a water inlet of the steam generating device through the electric water supply pump and the steam-driven water supply pump (21), and a steam outlet of the steam generating device is connected with an air inlet of the steam-driven water supply pump (21) and used for providing power for the steam-driven water supply pump (21); the pressure accumulating device stores cooling water inside, and a water outlet of the pressure accumulating device is connected with a water inlet of the steam generating device and used for supplying the cooling water to the steam generating device to maintain the liquid level of the steam generating device when the liquid level in the steam generating device is lower than a set value.

2. A startup water supply system for a passive nuclear power plant according to claim 1, characterized in that: the pressure accumulating device is a pressure accumulating box (25), and high-pressure gas is stored in the pressure accumulating box (25) and used for maintaining the pressure of cooling water in the pressure accumulating box (25).

3. A startup water supply system for a passive nuclear power plant according to claim 2, characterized in that: an electric valve (24) is arranged on a water outlet pipeline of the pressure storage tank (25).

4. A startup water supply system for a passive nuclear power plant according to claim 1, characterized in that: the electric water feeding pump comprises a first starting water feeding pump (2) and a second starting water feeding pump (3), the steam generating device comprises a first steam generator (15) and a second steam generator (16), the first starting water feeding pump (2), the second starting water feeding pump (3) and the steam-driven water feeding pump (21) are connected with a water inlet of the first steam generator (15) and the second steam generator (16) through a water feeding main pipe (8), and a steam outlet of the first steam generator (15) and the second steam generator (16) is connected with an air inlet of the steam-driven water feeding pump (21).

5. A startup water supply system for a passive nuclear power plant according to claim 4, characterized in that: an outlet pipeline of the starting feed water pump I (2) is provided with a pump outlet check valve I (4) and an isolation valve I (6); an outlet check valve II (5) and an isolation valve II (7) are arranged on an outlet pipeline of the starting feed water pump II (3); and an outlet pipeline of the steam feed water pump (21) is provided with a pump outlet check valve III (22) and an isolation valve III (23).

6. A startup water supply system for a passive nuclear power plant according to claim 4, characterized in that: a water inlet pipeline of the first steam generator (15) is provided with a first starting water supply regulating valve (9), a first check valve (11) and a first starting water supply isolation valve (13); and a water inlet pipeline of the second steam generator (16) is provided with a second starting water supply regulating valve (10), a second check valve (12) and a second starting water supply isolation valve (14).

7. A startup water supply system for a passive nuclear power plant according to claim 4, characterized in that: and the steam outlets of the first steam generator (15) and the second steam generator (16) are respectively connected with the air inlet of the steam-driven water-feeding pump (21) through a first main steam isolating valve (17) and a second main steam isolating valve (18).

8. A startup water supply system for a passive nuclear power plant according to claim 2, characterized in that: the high-pressure gas is high-pressure nitrogen.