CN217181822U

CN217181822U - Purification system

Info

Publication number: CN217181822U
Application number: CN202220146622.5U
Authority: CN
Inventors: 张欣; 王冲; 郭创成; 杨莉
Original assignee: Hualong International Nuclear Power Technology Co Ltd
Current assignee: Hualong International Nuclear Power Technology Co Ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-08-12
Anticipated expiration: 2032-01-19

Abstract

An embodiment of the present application provides a purification system, includes: the air injector and the purification assembly are arranged in the containment; the first inlet of the air ejector is communicated with a containment ventilation system, the second inlet of the air ejector is used for inputting the gas in the containment, and the outlet of the air ejector is communicated with the purification assembly; the purification component is used for purifying gas. Therefore, the existing containment ventilation system of the nuclear power plant is communicated with the air ejector, so that the used equipment of a purification system is reduced, and the limited space in the containment is saved.

Description

Purification system

Technical Field

The application relates to the technical field of nuclear power plant safety, in particular to a purification system.

Background

In the event of contamination of the interior of the containment of a nuclear power plant, a specialized in-containment air decontamination system is required to operate to reduce the activity of the atmosphere within the containment in order to ensure the safety of personnel prior to and during the stay within the containment.

At present, an independent air purification system in a containment is set up in a nuclear power plant, a fan is arranged in the containment, the air in the containment is purified through a high-efficiency filter and an iodine adsorber after the air is sucked into the containment through the fan, and for a better purification effect, a plurality of fans are usually arranged, so that a limited arrangement space in the containment is occupied.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a purification system, which can solve the problem that a fan in the purification system occupies a limited arrangement space in a containment vessel in the prior art.

In order to solve the technical problem, the present application is implemented as follows:

an embodiment of the present application provides a purification system, includes: the air injector and the purification assembly are arranged in the containment;

the first inlet of the air ejector is communicated with a containment ventilation system, the second inlet of the air ejector is used for inputting the gas in the containment, and the outlet of the air ejector is communicated with the purification assembly;

the purification component is used for purifying gas.

Optionally, the containment ventilation system includes a cooling ventilation system disposed inside the containment and a ventilation system disposed outside the containment.

Optionally, the air conditioner further comprises a pressure regulating valve, a first end of the pressure regulating valve is connected with the cooling ventilation system through a first connecting pipe, a second end of the pressure regulating valve is connected with the ventilation system through a second connecting pipe, and a third end of the pressure regulating valve is communicated with the air ejector.

Optionally, the valve further comprises a first valve and a second valve, the first valve is disposed on the first connection pipe, and the first valve is used for opening or closing the first connection pipe;

the second valve is provided on the second connection pipe, and the second valve is used for opening or closing the second connection pipe.

Optionally, the air ejector further comprises a third valve and a fourth valve, the third valve is arranged on the first connecting pipe, and the third valve is located between the first valve and the air ejector;

the fourth valve is disposed on the second connection pipe, and the fourth valve is located between the second valve and the air ejector.

Optionally, the purification assembly includes an air filter and an iodine adsorber, an outlet of the air ejector is communicated with an inlet of the air filter through a third connecting pipe, and an outlet of the air filter is communicated with the iodine adsorber through a fourth connecting pipe.

Optionally, the heating device further comprises a heater, and the heater may be disposed on the third connecting pipe or the fourth connecting pipe.

Optionally, the first valve and the second valve are isolation valves.

Optionally, the third valve and the fourth valve are check valves.

According to the technical scheme, the air ejector and the purification assembly are arranged in the containment, a first inlet of the air ejector is communicated with a containment ventilation system, a second inlet of the air ejector is used for inputting gas in the containment, and an outlet of the air ejector is communicated with the purification assembly, wherein the purification assembly is used for purifying the gas. Therefore, the existing containment ventilation system of the nuclear power plant is communicated with the air ejector, so that the used equipment of a purification system is reduced, and the limited space in the containment is saved.

Drawings

Fig. 1 is a schematic structural diagram of a purification system according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a purification system according to an embodiment of the present disclosure, the system including: a containment, and an air injector 10 and a purge assembly disposed within the containment;

the first inlet of the air injector 10 is communicated with a containment ventilation system, the second inlet of the air injector 10 is used for inputting the gas in the containment, and the outlet of the air injector 10 is communicated with the purification assembly;

the purification component is used for purifying gas.

The air ejector 10 uses compressed air or atmospheric air as a working medium, and draws air or other gas by generating low pressure at a nozzle outlet by means of air flow, and then compresses and discharges the air or other gas.

According to the technical scheme provided by the embodiment of the application, the air ejector 10 and the purification assembly are arranged in a containment, a first inlet of the air ejector 10 is communicated with a containment ventilation system, a second inlet of the air ejector 10 is used for inputting gas in the containment, and an outlet of the air ejector 10 is communicated with the purification assembly, wherein the purification assembly is used for purifying the gas. Therefore, the existing containment ventilation system of the nuclear power plant is communicated with the air injector 10, so that the using equipment of a purification system is reduced, and the limited space in the containment is saved.

The containment ventilation system is an existing ventilation system of a nuclear power plant and comprises a cooling ventilation system arranged inside the containment and a ventilation system arranged outside the containment.

In specific implementation, when the nuclear power plant unit normally operates and an accident occurs during refueling, the containment cooling ventilation system continuously operates; and during cold shutdown, the ventilation system of the containment vessel is connected into the ventilation system of the nuclear auxiliary plant to operate.

Optionally, a pressure regulating valve 20 is further included, a first end of the pressure regulating valve 20 is connected to the cooling ventilation system through a first connecting pipe, a second end of the pressure regulating valve 20 is connected to the ventilation system through a second connecting pipe, and a third end of the pressure regulating valve 20 is communicated with the air injector 10.

In this embodiment, the pressure regulating valve 20 is provided to regulate the pressure of the air entering the air injector 10 from the cooling ventilation system and the ventilation system, so that the pressure of the air entering the air injector 10 is within a reasonable pressure value, and the use efficiency of the air injector 10 is improved.

Optionally, the system further comprises a first valve 30 and a second valve 40, wherein the first valve 30 is disposed on the first connection pipe, and the first valve 30 is used for opening or closing the first connection pipe;

the second valve 40 is disposed on the second connection pipe, and the second valve 40 is used for opening or closing the second connection pipe.

Wherein the first valve 30 and the second valve 40 are isolation valves. By arranging the isolation valves on the first connecting pipe and the second connecting pipe, the isolation valves have higher requirements on leakage levels and higher safety.

In the concrete implementation, under the condition that an accident occurs during the normal operation of the nuclear power plant unit during refueling, at the moment, the containment cooling ventilation system continuously operates, if pollution is generated in the containment, air can be introduced into the containment cooling ventilation system by opening the first valve 30 (the second valve 40 is in a closed state), the air passes through the first valve 30, is subjected to pressure regulation through the pressure regulating valve 20 and then enters the air ejector 10, and due to the vacuum action of the air ejector 10, a part of polluted gas in the shell can be sucked in by a winding mode and is mixed with the introduced containment cooling ventilation system, and then the polluted gas is filtered and purified by the purification assembly and then is sent into the space in the shell. The containment cooling ventilation system is an internal circulation system in the shell, and all air sucked through the air ejector 10 roll is air in the shell.

During cold shutdown, the containment ventilation system is connected into the nuclear auxiliary plant ventilation system to operate, at the moment, the second valve 40 can be opened to introduce air into the nuclear auxiliary plant ventilation system, the air is subjected to pressure regulation through the regulating valve after passing through the second valve 40, and then enters the air ejector 10, and due to the vacuum effect of the air ejector 10, a part of polluted gas in the shell can be sucked in a winding manner, is mixed with the introduced air supplied by the containment ventilation system, and is filtered and purified through the purification assembly and then is sent into the space in the shell. The ventilation system of the nuclear auxiliary factory building supplies outdoor fresh air, and in order to keep the pressure in the shell constant, the redundant air supply quantity introduced into the air purification loop needs to be exhausted to the air outside the shell after being purified by the exhaust purification treatment system of the ventilation system of the nuclear auxiliary factory building through the exhaust pipeline of the containment ventilation system.

Optionally, a third valve 50 and a fourth valve 60 are further included, the third valve 50 is disposed on the first connecting pipe, and the third valve 50 is located between the first valve 30 and the air ejector 10;

the fourth valve 60 is disposed on the second connection pipe, and the fourth valve 60 is located between the second valve 40 and the air ejector 10.

Wherein the third valve 50 and the fourth valve 60 are check valves. The check valve is used for blocking the backflow of air, and can play a role in safety isolation when being used in combination with the isolating valve.

Optionally, the purification assembly includes an air filter 70 and an iodine adsorber 80, an outlet of the air injector 10 is communicated with an inlet of the air filter 70 through a third connection pipe, and an outlet of the air filter 70 is communicated with the iodine adsorber 80 through a fourth connection pipe.

The air filter 70 is a device for collecting dust from a gas-solid two-phase flow by the action of a porous filter material and purifying the gas. According to different standards and using energy efficiency, the filter can be divided into models such as a primary filter, a medium-efficiency filter, a high-efficiency filter and the like, the high-efficiency filter is usually used for improving the filtering efficiency, the filter material of the high-efficiency filter is superfine glass fiber filter paper, and the pores are very small, so that the filtering speed is very low, and the small dust particles, the screening effect and the diffusion effect are enhanced.

The iodine adsorber 80 is a core device for removing radioactive iodine pollutants in process waste gas and exhaust air of the nuclear power station.

In specific implementation, the high-efficiency air filter 70 performs a first-stage purification treatment on the gas, the treated gas with low dust content enters the iodine adsorber 80, a second-stage purification treatment is performed, the treated gas is emitted into the containment, and the air in the containment is subjected to an internal circulation type purification treatment, so that the safety of the containment is ensured, and the air cleanliness in the containment can be improved.

Optionally, a heater 90 may be further included, and the heater 90 may be disposed on the third connection pipe or the fourth connection pipe.

In this embodiment, by providing the heater 90, the humidity of the air to be processed is significantly reduced under the heating effect of the heater 90, so that the gas entering the subsequent purification equipment is dry gas, which can improve the purification efficiency of the iodine adsorber 80, and in addition, the service life of the purification equipment is longer compared with the gas with higher humidity which is not dried by the heater 90.

In a specific implementation, the heater 90 may be an electric heater 90, and in an alternative implementation, the electric heater 90 is disposed in the third connecting pipe, at this time, the humidity of the gas to be processed, which is ejected from the outlet of the air injector 10, is reduced under the heating effect of the electric heater 90, and the dried gas sequentially enters the air filter 70 and the iodine adsorber 80 to perform two-stage purification treatment, so as to achieve the purpose of purifying the air in the containment.

In another alternative embodiment, the electric heater 90 is disposed in the fourth connection pipe, at this time, the gas to be processed ejected from the outlet of the air ejector 10 firstly enters the air filter 70 to perform the first-stage purification process, then the humidity of the gas after the first-stage purification process is reduced under the heating effect of the electric heater 90, and the dried gas enters the iodine adsorber 80 to perform the second-stage purification process, so as to achieve the purpose of purifying the air in the containment.

While the present embodiments have been described with reference to the accompanying drawings, the present embodiments are not limited to the above-described embodiments, which are merely illustrative and not restrictive, and it will be apparent to those of ordinary skill in the art that many more modifications and variations can be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A purification system, comprising: the air injector and the purification assembly are arranged in the containment;

the purification component is used for purifying gas.

2. The decontamination system of claim 1, wherein the containment ventilation system comprises a cooling ventilation system disposed inside the containment and a ventilation system disposed outside the containment.

3. The purification system of claim 2, further comprising a pressure regulating valve, a first end of the pressure regulating valve being connected to the cooling ventilation system through a first connecting pipe, a second end of the pressure regulating valve being connected to the ventilation system through a second connecting pipe, a third end of the pressure regulating valve being in communication with the air ejector.

4. The purification system of claim 3, further comprising a first valve and a second valve, the first valve being disposed on the first connection pipe, the first valve being configured to open or close the first connection pipe;

5. The purging system of claim 4, further comprising a third valve and a fourth valve, the third valve disposed on the first connecting tube and the third valve positioned between the first valve and the air ejector;

6. The purification system of claim 1, wherein the purification assembly includes an air filter and an iodine adsorber, an outlet of the air ejector being in communication with an inlet of the air filter through a third connecting tube, and an outlet of the air filter being in communication with the iodine adsorber through a fourth connecting tube.

7. The purification system of claim 6, further comprising a heater that can be disposed on the third connection pipe or the fourth connection pipe.

8. The purification system of claim 4, wherein the first valve and the second valve are isolation valves.

9. The purification system of claim 5, wherein the third valve and the fourth valve are check valves.