Passive filtering device
By introducing HEPA filters and type II iodine adsorbers filled with activated carbon into the non-active filtration device, the problem of difficulty in removing small-sized radioactive aerosols and iodine in the existing devices is solved, and efficient radioactive material filtration and long-life use of activated carbon are achieved.
Patent Information
- Application Number
- CN202422336323.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-25
AI Technical Summary
Existing non-mobile filtration devices are difficult to effectively remove radioactive aerosols and iodine smaller than a specific size, resulting in a continued high radioactivity level in the air, threatening human health.
A non-active filter device is designed, including a HEPA filter and a type II iodine adsorber, which consists of a carbon bed filled with activated carbon, which can absorb radioactive iodine elements in the air and further filter the residual substances through a post-filter.
It realizes efficient filtration of radioactive aerosols and iodine in the air, reduces the radioactivity level in the air, extends the service life of activated carbon adsorbers, and reduces the replacement frequency and cost.
Smart Images
Figure CN222983995U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of filtration and environmental protection, in particular to a passive filtration device. Background Art
[0002] Passive filtration devices usually utilize natural forces or physical principles to achieve filtration and separation, without the need for external energy drive, and have the characteristics of energy conservation, environmental protection, simplicity and ease of use. Therefore, they are widely used in the environmental protection field for filtration and purification processes such as water treatment, air purification, and waste gas treatment.
[0003] In existing passive filtration devices, generally only dust, pollen, smoke and other suspended particles can be removed. Even some high-efficiency filters can capture tiny biological particles, but for radioactive aerosols smaller than a specific size, they are not sufficient to effectively remove them. The chemical and physical properties of some radioactive aerosols and iodine may make it more difficult to be captured by conventional filter materials. If these radioactive substances are not effectively removed, it may lead to a continuously high radioactive level in the air, thus posing a threat to human health. Summary of the Utility Model
[0004] The purpose of the utility model is to solve the deficiencies existing in the prior art, and a passive filtration device is proposed.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A passive filtration device includes a box body, which is made of stainless steel by sealed welding. A purification component is installed inside the box body. Inspection doors are symmetrically arranged on both sides outside the purification component. An inspection cover is arranged outside the inspection doors. An activated carbon sampling box is arranged on the top of the box body. A HEPA filter is arranged upstream of the box body. A type-II iodine adsorber is connected downstream of the HEPA filter. A post-filter is connected downstream of the type-II iodine adsorber.
[0007] Preferably, a plurality of test headers are arranged on the outer wall of the box body, and all the test headers are communicated with the inside of the box body.
[0008] Preferably, test ports are arranged at both the upstream and downstream ends of the box body. The number of the test ports is four, and one end of each test port is connected with an isolation valve.
[0009] Preferably, the number of type-II iodine adsorbers is three. The type-II iodine adsorbers are composed of activated carbon adsorbers. A carbon bed is arranged inside the activated carbon adsorber, and the carbon bed is filled with impregnated activated carbon.
[0010] Preferably, the impregnated activated carbon is composed of coconut shell activated carbon, impregnated potassium iodide and triacetyl diamine.
[0011] Preferably, a sampling tank is arranged inside the activated carbon sampling box, and the number of the sampling tanks is six.
[0012] The beneficial effects of the utility model are as follows:
[0013] The type-II iodine adsorber in the passive filter device can adsorb radioactive iodine elements in the air. Since the carbon bed in the type-II iodine adsorber is filled with impregnated activated carbon, it can have more active sites on its surface, improve the adsorption capacity for specific substances, and have stronger adsorption performance. At the same time, the impregnated activated carbon can improve its water resistance, solvent resistance and high temperature resistance, so that it can maintain stable adsorption performance under different environmental conditions, thereby reducing the radioactive level in the air. The HEPA filter can better filter radioactive aerosols in the air.
[0014] The post-filter can further filter the residual substances in the activated carbon adsorber, effectively prevent secondary pollution of activated carbon dust, reduce the pollutants in the activated carbon adsorber, reduce the load of the activated carbon, extend its service life, reduce the replacement frequency and cost, thereby improving the purification effect of the filter device. Description of the Drawings
[0015] Figure 1 It is a schematic diagram of the overall structure of a passive filter device proposed by the utility model
[0016] In the figure:
[0017] 1, box body; 2, maintenance door; 3, activated carbon sampling box; 4, HEPA filter; 5, type-II iodine adsorber; 6, post-filter; 7, test header; 8, test port. Specific Embodiments
[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0019] The content not detailedly described in this specification belongs to the prior art well known to those skilled in the art.
[0020] The standard parts used in the present utility model can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machines, parts and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.
[0021] Example:
[0022] Referring to Figure 1 , a passive filtration device includes a box body 1 which is made of stainless steel by sealed welding. A purification component is installed inside the box body 1. Inspection doors 2 are symmetrically arranged on both outer sides of the purification component. An inspection cover is arranged outside the inspection doors 2. An activated carbon sampling box 3 is arranged on the top of the box body 1. A HEPA filter 4 is arranged upstream of the box body 1. The downstream of the HEPA filter 4 is connected to a type-II iodine adsorber 5. The downstream of the type-II iodine adsorber 5 is connected to a post-filter 6.
[0023] A number of test headers 7 are arranged on the outer wall of the box body 1, and all the test headers 7 are communicated with the inside of the box body 1.
[0024] Test ports 8 are arranged at both the upstream and downstream ends of the box body 1. The number of the test ports 8 is four, and one end of each test port 8 is connected to an isolation valve.
[0025] The number of the type-II iodine adsorbers 5 is three. The type-II iodine adsorbers 5 are composed of activated carbon adsorbers. A carbon bed is arranged inside the activated carbon adsorber, and the carbon bed is filled with impregnated activated carbon.
[0026] The impregnated activated carbon is composed of coconut shell activated carbon, impregnated potassium iodide and triacetyl diamine.
[0027] A sampling tank is arranged inside the activated carbon sampling box 3, and the number of the sampling tanks is six.
[0028] In this implementation scheme, when using this passive filtration device, by using the carbon bed in the type-II iodine adsorber 5 in the box body 1, since the carbon bed is filled with impregnated activated carbon, more active sites can be formed on its surface, improving the adsorption capacity for specific substances. Therefore, for radioactive iodine in the air, the impregnated activated carbon has stronger adsorption performance, and the adsorption efficiency can reach more than 95%. At the same time, the impregnated activated carbon can improve its water resistance, solvent resistance and high temperature resistance, enabling it to maintain stable adsorption performance under different environmental conditions, thereby reducing the radioactive level in the air. By using the HEPA filter 4, radioactive aerosols in the air can be filtered, and its filtration efficiency can reach 99.97%.
[0029] Since some tiny particles or pollutants may be left during the adsorption process of the Type II iodine adsorber 5, the post-filter 6 downstream of the Type II iodine adsorber 5 is used to further filter the residual substances, prevent secondary pollution of activated carbon dust, reduce the pollutants in the activated carbon adsorber, lower the load of the activated carbon, reduce the replacement frequency and cost, prevent activated carbon particles or residual substances from entering the pipeline or equipment, reduce the wear and failure of the equipment, extend the service life of the equipment. The temporary pressure difference instrument is installed at the test port 8. At the same time, the test header 7 can facilitate the in-service inspection and periodic test of the air filtration unit at the box body 1. The sampling tank in the activated carbon sampling box 3 can be used to sample and detect the activated carbon, improving the purification effect of the filtration device.
[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.
[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.
[0032] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes an equivalent replacement or change, and should be covered by the protection scope of the present invention.
Claims
1. A passive filtering device, comprising a housing (1), characterized in that: The box body (1) is made of stainless steel sealed and welded, a purification component is installed inside the box body (1), inspection doors (2) are symmetrically arranged on both sides of the outside of the purification component, and an inspection cover is arranged outside the inspection door (2), an activated carbon sampling box (3) is arranged on the top of the box body (1), a HEPA filter (4) is arranged upstream of the box body (1), a type II iodine adsorber (5) is connected downstream of the HEPA filter (4), and a post-filter (6) is connected downstream of the type II iodine adsorber (5).
2. A passive filtering device according to claim 1, characterized in that: The outer wall of the box body (1) is provided with a plurality of test collection pipes (7), and the plurality of test collection pipes (7) are all connected to the interior of the box body (1).
3. A passive filtering device according to claim 1, characterized in that: Both upstream and downstream ends of the box body (1) are provided with test ports (8), the number of the test ports (8) is four, and one end of the test port (8) is connected to an isolation valve.
4. A passive filtering device according to claim 1, characterized in that: The number of the type II iodine adsorbers (5) is three, and the type II iodine adsorbers (5) are composed of activated carbon adsorbers, wherein a carbon bed is arranged inside the activated carbon adsorber, and the carbon bed is filled with impregnated activated carbon.
5. A passive filtering device according to claim 4, characterized in that: The impregnated activated carbon is composed of coconut shell activated carbon, impregnated potassium iodide and triacetyl diamide.
6. A passive filtering device according to claim 1, characterized in that: The activated carbon sampling box (3) is provided with sampling tanks inside, and the number of the sampling tanks is six.