CN217388306U

CN217388306U - Power supply circuit of evaporator accident discharge valve

Info

Publication number: CN217388306U
Application number: CN202221391679.8U
Authority: CN
Inventors: 刘伟东; 喻浩峰; 朱兴文; 徐西家; 王健; 文发龙; 侯小龙; 原玉
Original assignee: Huaneng Shandong Shidaobay Nuclear Power Co Ltd
Current assignee: Huaneng Shandong Shidaobay Nuclear Power Co Ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-09-06
Anticipated expiration: 2032-06-01

Abstract

The utility model provides a power supply circuit of evaporimeter accident discharge valve, power supply circuit includes I section of emergency bus, II sections of emergency bus, at least one first relief valve, at least one second relief valve, at least one first circuit breaker and at least one second circuit breaker; the first safety valve is electrically connected with the first section of the emergency bus through the corresponding first circuit breaker, the second safety valve is electrically connected with the second section of the emergency bus through the corresponding second circuit breaker, and the first safety valve and the second safety valve are arranged on a discharge pipeline in parallel. Adopt two sections emergency bus design, first relief valve and the parallelly connected setting of second relief valve are on the discharge pipeline to first relief valve and second relief valve correspond I section of emergency bus, II sections of emergency bus respectively, and when one of them emergency bus trouble, can utilize another emergency bus to guarantee the reliable operation of the relief valve that corresponds, reliably guarantee steam generator's accident emission function.

Description

Power supply circuit of evaporator accident discharge valve

Technical Field

The utility model belongs to the technical field of electrical equipment, concretely relates to power supply circuit of evaporimeter accident discharge valve.

Background

The evaporator emergency discharge valve is an important component of the steam generator emergency discharge system, which is a system related to the safety of the reactor. Because the secondary side pressure of the water/steam side of the steam generator is higher than the pressure of helium in a primary loop, when a tube breakage accident occurs on a heat transfer tube of the steam generator, water/steam in the tube invades into the primary loop, and the water steam flows into a reactor along with the helium, so that the positive and negative reactions can be introduced, and the pressure of the primary loop is increased and the reactor core of the reactor is damaged. In order to ensure the safety of the reactor, the amount of steam and water entering the primary loop system of the reactor must be reduced.

The power supply circuit of the conventional evaporator accident discharge valve is to electrically connect each safety valve with an emergency bus, so that the discharge valve fails after the emergency bus breaks down and other operation conditions, thereby causing the phenomena of loop pressure rise and damage to the reactor core.

SUMMERY OF THE UTILITY MODEL

The present disclosure is directed to solving at least one of the problems of the prior art and provides a power supply circuit for an emergency vent valve of an evaporator.

The utility model provides a power supply circuit of evaporimeter accident discharge valve, power supply circuit includes I section of emergency bus, II sections of emergency bus, at least one first relief valve, at least one second relief valve, at least one first circuit breaker and at least one second circuit breaker;

the first safety valve is electrically connected with the first section of the emergency bus through the corresponding first circuit breaker, the second safety valve is electrically connected with the second section of the emergency bus through the corresponding second circuit breaker, and the first safety valve and the second safety valve are arranged on a discharge pipeline in parallel.

In some embodiments, the power supply circuit further comprises at least one first backup power source and at least one first safety bus-section;

the first standby power supply is electrically connected with the I section of the emergency bus through the corresponding first circuit breaker, the first safety bus section is electrically connected with the first standby power supply through the corresponding first circuit breaker, and the first safety valve is electrically connected with the first safety bus section through the corresponding first circuit breaker.

In some embodiments, the power supply circuit further comprises at least one second backup power source and at least one second safety bus-section;

the second standby power supply is electrically connected with the second section of the emergency bus through the corresponding second circuit breaker, the second safety bus section is electrically connected with the second standby power supply through the corresponding second circuit breaker, and the second safety valve is electrically connected with the second safety bus section through the corresponding second circuit breaker.

In some embodiments, the first backup power source and/or the second backup power source employ a UPS power source.

In some embodiments, the power supply circuit includes a plurality of first safety valves;

the plurality of first relief valves are disposed in series on the discharge line.

In some embodiments, the power supply circuit includes a plurality of second safety valves;

the plurality of second relief valves are disposed in series on the discharge line.

In some embodiments, the discharge line comprises a first discharge sub-line and a second discharge sub-line arranged in parallel;

all the first relief valves are arranged on the first discharge sub-pipeline in series;

all of the second relief valves are disposed in series on the second discharge sub-line.

In some embodiments, the number of the first relief valves is two, and/or the number of the second relief valves is two.

In some embodiments, the first and/or second relief valve is an electromagnetic stop valve.

The utility model discloses a supply circuit of evaporimeter accident discharge valve adopts two sections emergency bus design, and first relief valve and the parallelly connected setting of second relief valve are on the discharge pipeline to first relief valve and second relief valve correspond I section of emergency bus, II sections of emergency bus respectively, and like this, when one of them emergency bus trouble, can utilize another emergency bus to guarantee the relief valve reliable operation that corresponds, reliably guarantee steam generator's accident discharge function.

Drawings

FIG. 1 is an electrical diagram of a power supply circuit for an evaporator emergency vent valve according to an embodiment of the present disclosure;

fig. 2 is a valve layout view of an evaporator emergency drain system according to another embodiment of the present disclosure.

Detailed Description

For a better understanding of the technical aspects of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

As shown in fig. 1 and 2, the present embodiment relates to a power supply circuit of an evaporator emergency discharge valve, which includes an emergency bus i section, an emergency bus ii section, two first safety valves (AA101/AA103), two second safety valves (AA102/AA104), a plurality of first circuit breakers K1 and a plurality of second circuit breakers K2.

Specifically, as shown in fig. 1, the first safety valve AA101 is electrically connected to the first section of the emergency bus through the corresponding first breaker K1, and the first safety valve AA103 is electrically connected to the first section of the emergency bus through the corresponding first breaker K1. The second safety valve AA102 is electrically connected to the second section of the emergency bus through the corresponding second circuit breaker K2, the second safety valve AA104 is electrically connected to the second section of the emergency bus through the corresponding second circuit breaker K2, and the first safety valve (AA101/AA103) and the second safety valve (AA102/AA104) are disposed in parallel on a discharge line, that is, as shown in fig. 2, the discharge line includes a first discharge sub-line and a second discharge sub-line disposed in parallel, the first safety valve (AA101/AA103) is disposed on the first discharge sub-line, and the second safety valve (AA102/AA104) is disposed on the second discharge sub-line.

The power supply circuit of evaporimeter accident discharge valve of this embodiment adopts the design of two sections emergency bus, and first relief valve and the parallelly connected setting of second relief valve are on the delivery pipeline to first relief valve and second relief valve correspond I section of emergency bus, II sections of emergency bus respectively, and like this, when one of them emergency bus trouble, can utilize another one emergency bus to guarantee the relief valve reliable operation that corresponds, reliably guarantee steam generator's accident discharge function.

It should be noted that the number of the first relief valve and the second relief valve is not limited to two, and those skilled in the art can design the relief valves according to actual needs, and the embodiment does not limit this.

Illustratively, as shown in FIG. 1, the power supply circuit further includes two first UPS power sources and two first safety bus sections (OBSA/OBSC). The first UPS power supply is electrically connected with the I section of the emergency bus through the corresponding first breaker K1. The first safety bus section OBSA is electrically connected to one of the first UPS power sources through the corresponding first circuit breaker K1, and the first safety bus section OBSC is electrically connected to the other first UPS power source through the corresponding first circuit breaker K1. The first safety valve AA101 is electrically connected to the first safety bus-section OBSA through the corresponding first breaker K1 and the first safety valve AA103 is electrically connected to the first safety bus-section OBSC through the corresponding first breaker K1.

Illustratively, as shown in FIG. 1, the power supply circuit further includes two second UPS power sources and two second safety bus sections (OBSB/OBSD). The second safety bus section OBSB is electrically connected to one of the second UPS power sources through the corresponding second circuit breaker K2, and the second safety bus section OBSD is electrically connected to the other second UPS power source through the corresponding second circuit breaker K2. The second safety valve AA102 is electrically connected to the second safety bus section OBSB through the corresponding second circuit breaker K2, and the second safety valve AA104 is electrically connected to the second safety bus section OBSD through the corresponding second circuit breaker K2.

The power supply circuit of the evaporator accident discharge valve provided by the embodiment can be used for continuously supplying power to the safety valve for a short time by two UPS (uninterrupted power supply) sources when the I section of the emergency bus and the II section of the emergency bus have faults through the arranged first UPS power source and the second UPS power source, so that the accident discharge function of the steam generator can be further reliably ensured.

It should be noted that, besides the UPS power source is used as the backup power source, a person skilled in the art may also use other types of power sources as the backup power source, and the embodiment is not limited thereto.

Illustratively, as shown in fig. 1 and 2, first relief valves AA101 and AA103 are disposed in series on the discharge line, and second relief valves AA102 and AA104 are disposed in series on the discharge line.

According to the power supply circuit of the evaporator accident discharge valve, the two safety valves form the series pipeline, so that when a single safety valve fails and cannot be closed, the discharge pipeline can be reliably closed through the other safety valve.

Illustratively, as shown in fig. 1 and 2, the first relief valve (AA101/AA103) is a solenoid-operated shutoff valve. The second safety valve (AA102/AA104) adopts an electromagnetic stop valve. The electromagnetic stop valve can be triggered to open by a loop humidity detection signal without manual input.

The principle of the present embodiment is explained below:

after the pipe breakage accident of the steam generator occurs, the stored water in the steam generator is discharged into special equipment, and the amount of steam and water entering the reactor is reduced, so that the reactivity accident caused by the fact that the steam enters the reactor core and the damage to the reactor core are reduced. When the pipe breakage accident of the steam generator occurs, water and steam leak to a primary loop to cause the humidity of the primary loop system to increase, when the humidity detection value exceeds the humidity protection limit value, a humidity detection signal triggers the reactor to stop, and the four safety valves of the water supply isolation valve and the steam generator accident discharge system are quickly closed; closing the main steam isolating valve in a delayed mode, and discharging steam and water in the steam generator to the discharge tank by utilizing the pressure difference between the two loops and the discharge tank; when the steam pressure of the secondary loop is balanced with the pressure of the primary loop, the four safety valves on the two parallel discharge pipelines are closed simultaneously, so that the steam generator is in a state to be detected.

It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.

Claims

1. A power supply circuit of an evaporator accident discharge valve is characterized by comprising an emergency bus I section, an emergency bus II section, at least one first safety valve, at least one second safety valve, at least one first circuit breaker and at least one second circuit breaker;

the first safety valve is electrically connected with the I section of the emergency bus through the corresponding first circuit breaker, the second safety valve is electrically connected with the II section of the emergency bus through the corresponding second circuit breaker, and the first safety valve and the second safety valve are arranged on a discharge pipeline in parallel.

2. The power supply circuit of claim 1, further comprising at least one first backup power source and at least one first safety bus-section;

3. The power supply circuit according to claim 2, characterized in that the power supply circuit further comprises at least one second backup power source and at least one second safety bus-section;

4. The power supply circuit according to claim 3, wherein the first backup power source and/or the second backup power source employs a UPS power source.

5. The power supply circuit according to any one of claims 1 to 4, wherein the power supply circuit includes a plurality of first safety valves;

6. Supply circuit according to any of claims 1 to 4, characterized in that it comprises a plurality of second safety valves;

7. The power supply circuit according to any one of claims 1 to 4, wherein the discharge line comprises a first discharge sub-line and a second discharge sub-line arranged in parallel;

all the first safety valves are arranged on the first discharge sub-pipeline in series;

8. Supply circuit according to any one of claims 1 to 4, characterized in that the number of said first safety valves is two and/or the number of said second safety valves is two.

9. The power supply circuit according to any one of claims 1 to 4, wherein the first safety valve and/or the second safety valve is/are an electromagnetic stop valve.