A purification system for nuclear power radioactive exhaust gas

Abstract

The utility model is a purification system for nuclear power radioactive exhaust gas, comprising: a pre-filter, a separator, a first composite separator, a dust filter and a booster fan, the pre-filter air outlet is connected to the separator air inlet through a pipeline, the separator air outlet is connected to the first composite separator first air inlet through a pipeline, the first composite separator first air outlet is connected to the dust filter air inlet through a pipeline, and the dust filter air outlet is connected to the booster fan air inlet through a pipeline. The system can separate solid particles, radioactive waste liquid, aerosol and other impurities contained in the exhaust gas from the gas, thereby achieving the purpose of purifying the gas, avoiding the exhaust gas from carrying radioactive substances to pollute the environment and causing radiation hazards.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas purification, and in particular relates to a purification system for nuclear power radioactive exhaust gas. Background Art

[0002] When the radioactive waste liquid generated by nuclear power production and operation is discharged into the tank, the air discharged from the exhaust pipe will carry dust, radioactive droplets and aerosol particles. Direct discharge will cause environmental pollution and cause certain radiation hazards to operators. The exhaust gas needs to be purified before it can be discharged into the ventilation system. The common method at present is to use a combination of wire mesh demister and filtration to treat the gas, but due to the low separation accuracy of the wire mesh demister and the low accuracy of the filtration part, the gas purification is not thorough and it is difficult to meet the emission standards. Utility Model Content

[0003] Therefore, the utility model aims to solve the problem of incomplete purification of nuclear power radioactive exhaust gas in the prior art.

[0004] To this end, the technical solution adopted is that the utility model is a purification system for nuclear power radioactive exhaust gas, including: a pre-filter, a separator, a first composite separator, a dust filter and a booster fan, the air outlet of the pre-filter is connected to the air inlet of the separator through a pipeline, the air outlet of the separator is connected to the first air inlet of the first composite separator through a pipeline, the first air outlet of the first composite separator is connected to the air inlet of the dust filter through a pipeline, and the air outlet of the dust filter is connected to the air inlet of the booster fan through a pipeline.

[0005] Preferably, the booster fan outlet is connected to the regeneration gas heater inlet through a pipeline, the regeneration gas heater outlet is connected to the first air inlet of the second composite separator, the second composite separator first air outlet is connected to the regeneration gas cooler inlet, and the regeneration gas cooler outlet is connected to the pre-filter inlet.

[0006] Preferably, the second air inlet of the first composite separator is connected to the air outlet of the regeneration gas heater through a pipe, the second air outlet of the first composite separator is connected to the air inlet of the regeneration gas cooler through a pipe, the air outlet of the separator is connected to the second air inlet of the second composite separator through a pipe, and the second air outlet of the second composite separator is connected to the air inlet of the dust filter through a pipe.

[0007] Preferably, the pre-filter, the separator and the dust filter are all provided with sewage outlets, and each sewage outlet is connected to the sewage discharge system through a pipeline.

[0008] Preferably, the regeneration gas cooler is provided with a refrigerant filling port and a heat medium filling port.

[0009] Preferably, each pipeline is provided with a valve.

[0010] Preferably, the valve is a pneumatic valve or an electric valve.

[0011] Preferably, both the gas outlet of the regeneration gas heater and the gas outlet of the regeneration gas cooler are provided with temperature sensors.

[0012] The technical solution of the utility model has the following advantages: the system can separate the solid particles, radioactive waste liquid, aerosol and other impurities contained in the exhaust gas from the gas, thereby achieving the purpose of purifying the gas and preventing the exhaust gas from carrying radioactivity and polluting the environment, causing radiation hazards.

[0013] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures particularly pointed out in the written description and the drawings.

[0014] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a work flow chart of the utility model;

[0018] Figure 3 This is a regeneration workflow diagram of the first composite separator in the utility model;

[0019] Figure 4 This is a regeneration workflow diagram of the second composite separator in the utility model;

[0020] Among them, 1. pre-filter; 2. separator; 3. first composite separator; 4. dust filter; 5. booster fan; 6. regeneration gas heater; 7. second composite separator; 8. regeneration gas cooler; 9. valve; 10. temperature sensor. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.

[0023] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] The utility model provides a purification system for nuclear power radioactive exhaust gas, such as Figure 1-2 As shown, it includes: a pre-filter 1, a separator 2, a first composite separator 3, a dust filter 4 and a booster fan 5. The air inlet of the pre-filter 1 is connected to the exhaust port of the waste liquid storage tank through a pipeline. The waste liquid tank stores radioactive waste liquid generated by nuclear power production and operation. The air outlet of the pre-filter 1 is connected to the air inlet of the separator 2 through a pipeline. The air outlet of the separator 2 is connected to the first air inlet of the first composite separator 3 through a pipeline. The first air outlet of the first composite separator 3 is connected to the air inlet of the dust filter 4 through a pipeline. The air outlet of the dust filter 4 is connected to the air inlet of the booster fan 5 through a pipeline. The exhaust port of the booster fan 5 is connected to the ventilation system through a pipeline. The separation accuracy of the separator 2 is as high as 0.01μm. The first composite separator 3 uses a regenerable and low-temperature pyrolyzable adsorption filler composited with multiple materials.

[0026] The working principle and beneficial technical effects of the above technical solution are as follows: the waste gas discharged from the exhaust port of the waste liquid storage tank is filtered by the pre-filter 1 for the particles with larger particle size contained in the waste gas, and then the liquid particles, dust particles and aerosol particles contained in the waste gas are intercepted and agglomerated and separated by the separator 2. The first composite separator 3 adsorbs the harmful substances in the waste gas and dries the gas to ensure that the exhaust gas has no radiation hazard. The gas will carry trace dust after passing through the first composite separator 3. The dust filter 4 removes the trace adsorbent dust contained in the gas. Since the gas will have pressure loss after passing through the pre-filter 1, the separator 2, the first composite separator 3 and the dust filter 4, in order to overcome the gas pressure loss, the booster fan 5 provides power so that the purified gas is discharged through the ventilation system. Through this system, the solid particles, radioactive waste liquid, aerosol and other impurities contained in the exhaust gas can be separated from the gas, so as to achieve the purpose of purifying the gas and avoid the exhaust gas carrying radioactivity to pollute the environment and cause radiation hazards.

[0027] In one embodiment, Figure 1 and 3 As shown, the air outlet of the booster fan 5 is connected to the air inlet of the regeneration gas heater 6 through a pipeline, the air outlet of the regeneration gas heater 6 is connected to the first air inlet of the second composite separator 7, the first air outlet of the second composite separator 7 is connected to the air inlet of the regeneration gas cooler 8, and the air outlet of the regeneration gas cooler 8 is connected to the air inlet of the pre-filter 1. After the adsorbent in the first composite separator 3 and the second composite separator 7 is saturated with adsorption, it needs to be regenerated, and the partially purified gas is heated and passed through the adsorbent, so that the adsorbent can be regenerated.

[0028] The working principle and beneficial technical effects of the above technical solution are as follows: when the adsorbent in the first composite separator 3 is saturated, the adsorbent needs to be regenerated, and the second composite separator 7 is started. The exhaust gas passes through the pre-filter 1, the separator 2, the second composite separator 7, the dust filter 4 and the booster fan 5 in sequence. Part of the purified gas is discharged from the ventilation system, and the other part is first heated by the regeneration gas heater 6, and then passes through the first composite separator 3 for adsorbent regeneration. After that, the gas passes through the regeneration gas cooler 8 for cooling and removing the condensate, and then is discharged to the air inlet of the pre-filter 1 for circulation purification, so that the system can be in operation for a long time.

[0029] In one embodiment, Figure 1 and 4 As shown, the second air inlet of the first composite separator 3 is connected to the air outlet of the regeneration gas heater 6 through a pipeline, the second air outlet of the first composite separator 3 is connected to the air inlet of the regeneration gas cooler 8 through a pipeline, the air outlet of the separator 2 is connected to the second air inlet of the second composite separator 7 through a pipeline, and the second air outlet of the second composite separator 7 is connected to the air inlet of the dust filter 4 through a pipeline.

[0030] The working principle and beneficial technical effects of the above technical solution are as follows: when the adsorbent in the second composite separator 7 is saturated, the first composite separator 3 is started, and the exhaust gas passes through the pre-filter 1, separator 2, first composite separator 3, dust filter 4 and booster fan 5 in sequence. A part of the purified gas is discharged from the ventilation system, and the other part is first heated by the regeneration gas heater 6, and then regenerated by the second composite separator 7. After that, the gas passes through the regeneration gas cooler 8 for cooling and removal of condensate, and then discharged to the air inlet of the pre-filter 1 for circulation purification, so that the system can be in operation for a long time. The use cycle of the adsorbent is extended by regenerating and reusing the adsorbent.

[0031] In one embodiment, Figure 1 As shown, the pre-filter 1, the separator 2, and the dust filter 4 are all provided with sewage outlets, and each sewage outlet is connected to the sewage system through a pipeline, so that impurities such as solid particles, radioactive waste liquid, and aerosols can be easily discharged from the sewage outlet for centralized treatment. The regeneration gas cooler 8 is provided with a refrigerant filling port and a heat medium filling port to replenish the refrigerant and the heat medium. A valve 9 is provided on each pipeline to control the opening or closing of the pipeline. The valve 9 is a pneumatic valve or an electric valve. The air outlet of the regeneration gas heater 6 and the air outlet of the regeneration gas cooler 8 are both provided with a temperature sensor 10, which is used to monitor whether the regeneration gas temperature reaches the regeneration temperature and whether the cooling temperature reaches the required temperature. The entire system adopts a PLC system for automatic control, which can realize fully automatic unattended 24-hour uninterrupted operation.

[0032] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A purification system for nuclear power radioactive exhaust gas, comprising: A pre-filter (1), a separator (2), a first composite separator (3), a dust filter (4) and a booster fan (5); the air outlet of the pre-filter (1) is connected to the air inlet of the separator (2) via a pipeline, the air outlet of the separator (2) is connected to the first air inlet of the first composite separator (3) via a pipeline, the first air outlet of the first composite separator (3) is connected to the air inlet of the dust filter (4) via a pipeline, and the air outlet of the dust filter (4) is connected to the air inlet of the booster fan (5) via a pipeline.

2. A purification system for nuclear power radioactive exhaust gas according to claim 1, characterized in that: The air outlet of the booster fan (5) is connected to the air inlet of the regeneration gas heater (6) through a pipeline, the air outlet of the regeneration gas heater (6) is connected to the first air inlet of the second composite separator (7), the first air outlet of the second composite separator (7) is connected to the air inlet of the regeneration gas cooler (8), and the air outlet of the regeneration gas cooler (8) is connected to the air inlet of the pre-filter (1).

3. A purification system for nuclear power radioactive exhaust gas according to claim 2, characterized in that: The second air inlet of the first composite separator (3) is connected to the air outlet of the regeneration gas heater (6) through a pipeline, the second air outlet of the first composite separator (3) is connected to the air inlet of the regeneration gas cooler (8) through a pipeline, the air outlet of the separator (2) is connected to the second air inlet of the second composite separator (7) through a pipeline, and the second air outlet of the second composite separator (7) is connected to the air inlet of the dust filter (4) through a pipeline.

4. A purification system for nuclear power radioactive exhaust gas according to claim 3, characterized in that: The pre-filter (1), the separator (2) and the dust filter (4) are all provided with sewage outlets, and each sewage outlet is connected to the sewage discharge system through a pipeline.

5. A purification system for nuclear power radioactive exhaust gas according to claim 1, characterized in that: The regeneration gas cooler (8) is provided with a refrigerant filling port and a heat medium filling port.

6. A purification system for nuclear power radioactive exhaust gas according to claim 4, characterized in that: Each pipeline is provided with a valve (9).

7. A purification system for nuclear power radioactive exhaust gas according to claim 6, characterized in that: The valve (9) is a pneumatic valve or an electric valve.

8. A purification system for nuclear power radioactive exhaust gas according to claim 2, characterized in that: The gas outlet of the regeneration gas heater (6) and the gas outlet of the regeneration gas cooler (8) are both provided with temperature sensors (10).

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