An iodine adsorber

Abstract

The application discloses an iodine adsorber and belongs to the technical field of air purification, which comprises a box body, wherein the box body comprises oppositely arranged filter material bags, a plurality of interlayer reinforcing ribs vertically arranged between the filter material bags, a first side plate and a second side plate vertically arranged on both sides of the filter material bags and parallel to the interlayer reinforcing ribs, a panel assembly and a sealing plate assembly vertically arranged at both ends of the filter material bags and perpendicular to the interlayer reinforcing ribs; the filter material bag comprises an air inlet hole plate close to the interlayer reinforcing rib, an air outlet hole plate away from the interlayer reinforcing rib and a plurality of filter material bag reinforcing ribs parallel to the interlayer reinforcing rib and vertically arranged between the air inlet hole plate and the air outlet hole plate, a flow uniformizing net is arranged in a cavity formed by the filter material bag reinforcing ribs, and the cavity is filled with filter material; the filter material bag reinforcing rib comprises two hollow plates vertically arranged between the air inlet hole plate and the air outlet hole plate and two air baffle plates vertically arranged on the hollow plates to form a cavity, a diaphragm is attached to the inner side of the cavity in the direction of the hollow plate, and the cavity is filled with foam. The iodine adsorber can ensure the adsorption rate and reduce the fire risk.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, specifically an iodine adsorber. Background Technology

[0002] The main component of an iodine adsorption filter is activated carbon adsorbent containing impregnating agent, which removes iodine from the air through adsorption.

[0003] Iodine adsorption filters are classified into Type I, II, and III iodine adsorbers. Type I iodine adsorbers are the earliest type used, featuring a folded structure and consisting of a rectangular frame, adsorption bed, sealing ring, and fasteners; they are typically used in parallel. Type II iodine adsorbers have a drawer-type structure, which is lighter and smaller than Type I, facilitating handling and installation. Type III iodine adsorbers consist of one or more activated carbon beds, with dimensions varying flexibly depending on the gas flow rate. The adsorbent is loaded and unloaded on-site, and they are mostly cylindrical in shape.

[0004] Existing iodine adsorbers have the following drawbacks:

[0005] (1) Filter media with low loading has fewer active sites, resulting in weaker physical and chemical adsorption of methyl iodine and a lower saturated adsorption rate, which cannot guarantee the efficient removal of radioactive iodine-containing waste gas. Although filter media with high loading has a higher adsorption rate, the heat released during combustion is much higher than 35 mJ / kg, posing a significant fire risk.

[0006] (2) The alternating process of nuclear power production may generate short-term high-concentration iodine-containing waste gas, or in the event of an accidental leak, it may generate instantaneous extremely high concentrations of pollutants. Simply increasing the concentration of the modifier to increase the adsorption capacity has a bottleneck and is difficult to cope with emergencies.

[0007] (3) The gas flowing through the filter media pack is concentrated on the side near the panel. The flow rate is low and the filter media utilization rate is low on the side away from the panel. As the usage time increases, the uneven distribution intensifies. The filter media in the area through which the high-speed airflow flows is fragmented, forming local cavities, which will shorten the service life of the iodine adsorber. Summary of the Invention

[0008] The purpose of this invention is to provide an iodine adsorber that can reduce the risk of fire while ensuring the adsorption rate.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An iodine adsorber includes a housing, the housing comprising filter media bags (1) arranged opposite to each other, a plurality of interlayer reinforcing ribs (6) spaced apart and vertically arranged between the filter media bags (1), a first side plate (4) and a second side plate (5) arranged parallel to the interlayer reinforcing ribs (6) and vertically arranged on both sides of the filter media bags (1), a panel assembly (2) and a sealing plate assembly (3) perpendicular to the interlayer reinforcing ribs (6) and vertically arranged at both ends of the filter media bags (1);

[0011] The filter media pack (1) includes an air inlet plate (11) close to the interlayer reinforcing rib (6), an air outlet plate (12) away from the interlayer reinforcing rib (6), and a plurality of filter media pack reinforcing ribs (13) spaced vertically between the air inlet plate (11) and the air outlet plate (12) and parallel to the interlayer reinforcing rib (6). The cavity formed by the filter media pack reinforcing ribs (13) is provided with a flow equalization net (14) and filled with filter media.

[0012] The filter media pack reinforcing rib (13) is formed by two perforated plates (131) vertically arranged between the air inlet plate (11) and the air outlet plate (12) and two wind baffles (132) vertically arranged on the perforated plates (131) to form a cavity. A diaphragm (133) is attached to the perforated plate (131) facing the inside of the cavity, and the cavity is filled with foam.

[0013] Furthermore, the panel assembly (2) includes a panel perpendicular to the filter media pack (1) and a handle on the panel. The panel has an exhaust gas inlet, and a sealing strip is provided on the side of the panel that is joined to the housing.

[0014] Furthermore, the sealing plate assembly (3) includes a filter media pack reinforcing rib sealing plate (31), a bottom plate sealing plate (32), and a cover plate sealing plate (33) stacked perpendicular to the filter media pack (1). The filter media pack reinforcing rib sealing plate (31) is provided with a buckle corresponding to the filter media pack reinforcing rib (13). The bottom plate sealing plate (32) is provided with a material replacement port corresponding to the filter media pack (1). The bottom plate sealing plate (32) and the cover plate sealing plate (33) are provided with corresponding screw holes.

[0015] Furthermore, the air inlet plate (11) and air outlet plate (12) are covered with nonwoven fabric with a resistance of less than 20 Pa @ 1 m / s and a temperature resistance greater than or equal to 300°C.

[0016] Furthermore, the perforated plate (131) includes side baffles (1311) at both ends of the perforated plate (131), a number of perforations between the side baffles (1311), and side reinforcing ribs (1312) spaced between each group of perforations.

[0017] Furthermore, the diaphragm (133) is made of a porous ceramic material that is open-celled at temperatures below 80°C and closed-celled at temperatures above 120°C.

[0018] Furthermore, the foam is an elastomer extruded from a dense clay module and impregnated or filled with one or both of potassium iodide and triethylenediamine, and the thickness of the foam is greater than that of the cavity.

[0019] Furthermore, the flow equalization mesh (14) includes a densely folded end near the panel assembly (2) and a sparsely folded end away from the panel assembly (2), or includes a sparsely folded end near the panel assembly (2), a sparsely folded end away from the panel assembly (2), and a densely folded end connected between the sparsely folded ends.

[0020] The flow equalization net (14) is a predetermined distance from the inner wall of the cavity formed by the reinforcing ribs (13) of each filter media pack;

[0021] The flow equalization mesh (14) is made of one or more of graphene oxide aerogel, graphene aerogel, graphene oxide fabric, modified fiber, carbon fiber, carbon nanotube, and clay module, and is loaded or filled with one or two of potassium iodide and triethylenediamine.

[0022] Furthermore, the interlayer reinforcing rib (6) is provided with microspheres composed of one or more of polystyrene, polyimide, polyetherketone, polycarbonate, and polyethylene terephthalate and filled with flame retardant.

[0023] Furthermore, the surface of the air inlet plate (11) facing the interlayer reinforcing rib (6) is coated with the microspheres, and the filter material contains the microspheres.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The iodine adsorber provided by this invention features reinforcing ribs for the filter media pack between the inlet and outlet perforated plates. This not only distributes the weight of the filter media but also separates the airflow, effectively preventing channeling. The foam is covered by a diaphragm. Within the operating temperature range, the diaphragm does not obstruct the release of the modifier from the foam, providing a continuous source of modification for the filter media. Beyond the operating temperature range, the diaphragm blocks the release of the modifier from the foam, reducing the risk of fire caused by a violent reaction due to rapid release of the modifier. The foam is an elastomer extruded from dense kaolin modules, capable of withstanding strong surrounding pressure while maintaining its shape, and is also non-flammable. The modifier in the foam is released slowly at room temperature and accelerated upon heating. During the physical adsorption of methyl iodine into the filter media pores, filter media with lower modifier content retains high CTC and high specific surface area, and the abundant micropores promote efficient adsorption of methyl iodine. The nucleophilic substitution reaction during the heating stage demands a large amount of modifier; timely replenishment of the foam can increase the reaction rate, promote the forward reaction, and further improve the adsorption rate. Potassium iodide increases oxidative functional groups, and triethylenediamine increases amino functional groups. Impregnating porous materials with potassium iodide and triethylenediamine can achieve both physical and chemically stable adsorption, resulting in filter media with high efficiency and high adsorption capacity. The densely pleated and sparsely pleated ends of the flow equalization mesh guide the airflow to a uniform distribution, thereby improving the airflow uniformity of the iodine adsorber and extending its service life. Loading or filling the flow equalization mesh with one or both of potassium iodide and triethylenediamine can reduce the risk of leakage due to potential penetration during the initial stage of a fire or a sudden high concentration. The interlayer reinforcing ribs are equipped with microspheres containing flame retardants, which can pre-release flame retardants in the early stages of a fire and be carried to the filter media by the airflow. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the disassembled structure of the iodine adsorber provided in an embodiment of the present invention;

[0027] Figure 2 This is an overall schematic diagram of the iodine adsorber provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram showing the disassembled structure of the filter media package provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the reinforcing ribs of the filter media pack provided in an embodiment of the present invention.

[0030] In the diagram: 1-Filter media bag; 11-Inlet perforated plate; 12-Outlet perforated plate; 13-Filter media bag reinforcing rib; 131-Perforated plate; 1311-Side baffle; 1312-Side reinforcing rib; 132-Wind baffle; 133-Diaphragm; 14-Flow equalization mesh; 2-Panel assembly; 3-Sealing plate assembly; 31-Filter media bag reinforcing rib sealing plate; 32-Bottom plate sealing plate; 33-Cover plate sealing plate; 4-First side plate; 5-Second side plate; 6-Interlayer reinforcing rib. Detailed Implementation

[0031] The technical solution of this application will be further described in detail below with reference to specific embodiments.

[0032] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Unless otherwise specified, the embodiments of this application and the technical features within them can be combined with each other.

[0033] Example 1:

[0034] This embodiment provides an iodine adsorber, such as Figure 2 As shown, including the housing, such as Figure 1 As shown, the housing includes filter media bags 1 arranged opposite each other, several interlayer reinforcing ribs 6 spaced vertically between the filter media bags 1, a first side plate 4 and a second side plate 5 parallel to the interlayer reinforcing ribs 6 and vertically arranged on both sides of the filter media bags 1, a panel assembly 2 and a sealing plate assembly 3 perpendicular to the interlayer reinforcing ribs 6 and vertically arranged at both ends of the filter media bags 1. Figure 1 , Figure 3 As shown, the filter media pack 1 includes an air inlet plate 11 near the interlayer reinforcing rib 6, an air outlet plate 12 away from the interlayer reinforcing rib 6, and a plurality of filter media pack reinforcing ribs 13 spaced vertically between the air inlet plate 11 and the air outlet plate 12 and parallel to the interlayer reinforcing rib 6. A flow equalization mesh 14 is provided within the cavity formed by the filter media pack reinforcing ribs 13, and the cavity is filled with filter media. Figure 1 , Figure 4 As shown, the filter bag reinforcing rib 13 is formed by two perforated plates 131 vertically arranged between the air inlet plate 11 and the air outlet plate 12 and two wind baffles 132 vertically arranged on the perforated plates 131 to form a cavity. A diaphragm 133 is attached to the perforated plate 131 facing the inside of the cavity, and the cavity is filled with foam.

[0035] In this embodiment, as Figure 1 , Figure 2 As shown, the panel assembly 2 includes a panel perpendicular to the filter media pack 1 and a handle on the panel. The panel has an exhaust gas inlet, and a sealing strip is provided on the side where the panel joins the housing.

[0036] The panel is made of thickened sheet material, specifically metal sheet or high-strength carbon fiber. Handles are securely welded or screwed onto the panel, and there are two or more handles. Iodine-containing waste gases, especially those from the nuclear industry, flow in through the waste gas inlet on the panel and flow out through the upper and lower air outlet plates 12 of the housing to remove iodine.

[0037] In this embodiment, as Figure 1 As shown, the sealing plate assembly 3 includes a filter media pack reinforcing rib sealing plate 31, a bottom plate sealing plate 32, and a cover plate sealing plate 33 stacked vertically to the filter media pack 1. The filter media pack reinforcing rib sealing plate 31 is provided with a buckle corresponding to the filter media pack reinforcing rib 13. The bottom plate sealing plate 32 is provided with a material replacement port corresponding to the filter media pack 1. The bottom plate sealing plate 32 and the cover plate sealing plate 33 are provided with corresponding screw holes.

[0038] The filter media bag reinforcing rib sealing plate 31 locks the opening of the filter media bag reinforcing rib 13 through the clamping force between the bottom plate sealing plate 32 and the first side plate 4 and the second side plate 5, which facilitates the replacement of the diaphragm 133 and foam. The bottom plate sealing plate 32 and the cover plate sealing plate 33 are detachably connected by screws, which facilitates the filling or replacement of filter media into the filter media bag 1 through the material replacement port.

[0039] In this embodiment, the aperture of the air inlet plate 11 and the air outlet plate 12 is determined according to the particle size of the filter material. When the particle size of the filter material is 8 mesh to 16 mesh, the aperture of the air inlet plate 11 and the air outlet plate 12 is set to be less than or equal to 1.1 mm, or the aperture of the air inlet plate 11 and the air outlet plate 12 is set to be 2 mm to 3 mm and connected with a densely woven mesh. The air inlet plate 11 and the air outlet plate 12 are covered with non-woven fabric with a resistance of less than 20 Pa @ 1 m / s and a temperature resistance of greater than or equal to 300°C. The non-woven fabric is made of PET material.

[0040] The air inlet plate 11 and the air outlet plate 12 can also be diamond-shaped or grid-shaped plates covered with non-woven fabric.

[0041] In this embodiment, as Figure 4 As shown, the perforated plate 131 includes side baffles 1311 at both ends of the perforated plate 131, a number of perforations between the side baffles 1311, and side reinforcing ribs 1312 spaced between each group of perforations. The area ratio of the side baffles 1311 to the perforated plate 131 is greater than or equal to 15%, and the porosity of the perforated plate 131 is 5% to 20%.

[0042] The perforation is not completely open; side reinforcing ribs 1312 are provided between each group of perforations to ensure the strength of the perforated plate 131. To ensure that the modifier can fully diffuse to the filter media on both sides when the foam is heated, the perforations in the perforated plate 131 are rectangular, circular, or triangular, with a porosity of 5% to 20%. Excessive porosity will weaken the strength of the filter media reinforcement ribs 13 and may increase channeling. Preferably, C-shaped plates are connected at the positions of the side reinforcing ribs 1312 to increase strength. More preferably, reinforcing strips are provided in the direction perpendicular to the baffle plate 132 to increase strength.

[0043] In this embodiment, the diaphragm 133 is made of porous ceramic material, which is open-celled at temperatures below 80°C and closed-celled at temperatures above 120°C.

[0044] The diaphragm 133 is bonded to the inside of the cavity of the perforated plate 131 under high pressure, or it is adhered to the inside of the cavity of the perforated plate 131 using a low-release, high-temperature resistant adhesive, or it is pressed against the inside of the cavity of the perforated plate 131 by the elasticity of the foam. The diaphragm 133 can wrap around the foam to prevent the foam from slipping off. The diaphragm 133 is made of porous ceramic material. The porous ceramic material is open-celled below 80°C, gradually closes its pores between 80°C and 120°C, and is closed-celled above 120°C. This reduces the risk of fire caused by a violent reaction due to the rapid release of modifiers in the foam.

[0045] In this embodiment, the foam is an elastomer extruded from a dense clay module and impregnated or filled with one or both of potassium iodide and triethylenediamine. The thickness of the foam is 1 mm to 4 mm greater than that of the cavity.

[0046] Foam with hollow cavities is made using kaolin as a base material. This non-Newtonian fluid can withstand strong surrounding pressure while maintaining its shape. Furthermore, kaolin has a high ignition point, is flame-retardant, and is economical and cost-effective. When the foam is impregnated with one or both of potassium iodide and triethylenediamine, the concentration of potassium iodide is 5%–70%, and the concentration of triethylenediamine is 5%–90%; preferably, the concentration of potassium iodide is 10%–60%, and the concentration of triethylenediamine is 50%–70%; more preferably, the concentration of potassium iodide is 40%, and the concentration of triethylenediamine is 70%. When the foam is filled with one or both of potassium iodide and triethylenediamine, the mass of potassium iodide is 1%–3% of the carbon content of the filter media, and the mass of triethylenediamine is 3%–9% of the carbon content of the filter media; preferably, the mass of potassium iodide is 2% of the carbon content of the filter media, and the mass of triethylenediamine is 5% of the carbon content of the filter media. The thickness of the foam is 1mm to 4mm greater than that of the cavity; preferably, the foam is a module with a hole side length of 0.1mm to 3mm and a wall thickness of 0.1mm to 3mm; more preferably, the foam is a module with a hole side length of 0.1mm to 1mm and a wall thickness of 0.5mm to 1.5mm. Preferably, the foam can also be extruded into shapes such as clover, four-leaf clover, cylinder, triangular pyramid, and hexahedron.

[0047] Preferably, the foam can also be made of materials such as maifan stone, PTFE mesh, or PF gel, making full use of their non-flammable properties and high-strength channels.

[0048] Preferably, the foam can also be a zeolite molecular sieve, which is non-flammable at high temperatures and has abundant pores; more preferably, it is an X13 molecular sieve.

[0049] Preferably, the foam can also be one or more of the following: acid-modified cellulose, aromatic hydrocarbon polymers, graphene-based nanomaterials, metal-organic frameworks (MOFs), carbon nanotubes, carbon fibers, ion-exchange fibers, high-benzene clay, and metal oxide aerogels.

[0050] In this embodiment, as Figure 3 As shown, the flow equalization mesh 14 includes a densely folded end near the panel assembly 2 and a sparsely folded end away from the panel assembly 2, or includes a sparsely folded end near the panel assembly 2, a sparsely folded end away from the panel assembly 2, and a densely folded end connected between the sparsely folded ends; the flow equalization mesh 14 is 1mm to 10mm away from the inner wall of the cavity formed by the reinforcing ribs 13 of each filter media pack.

[0051] Because the gas flowing through the filter media pack 1 is more concentrated near the panel assembly 2, the flow equalization mesh 14 includes a densely folded end near the panel assembly 2 and a sparsely folded end away from the panel assembly 2. The substrate thickness of the densely folded end is larger, and the folds are denser, while the substrate thickness of the sparsely folded end is 50% to 80% of that of the densely folded end, the number of folds per inch of the sparsely folded end is 30% to 80% of that of the densely folded end, and the fold height of the sparsely folded end is 70% to 100% of that of the densely folded end. Preferably, the substrate thickness of the sparsely folded end is 60% to 70% of that of the densely folded end, the number of folds per inch of the sparsely folded end is 50% to 70% of that of the densely folded end, and the fold height of the sparsely folded end is 90% of that of the densely folded end. The flow equalization mesh 14 is 1 mm to 10 mm away from the inner wall of the cavity formed by the reinforcing ribs 13 of each filter media pack, which facilitates the full diffusion and compaction of the filter media into the cavity during the filling process.

[0052] In this embodiment, the flow equalization mesh 14 is made of one or more of graphite oxide aerogel, graphene aerogel, graphite oxide fabric, modified fiber, carbon fiber, carbon nanotube, and clay module, and is loaded or filled with one or two of potassium iodide and triethylenediamine.

[0053] In addition to its flow equalization function, the flow equalization mesh 14 is also loaded or filled with one or both of potassium iodide and triethylenediamine to reduce the risk of iodine leakage during the initial stage of a fire or when there is a high concentration of iodine. The flow equalization mesh 14 is made of one or more of the following materials: graphite oxide aerogel, graphene aerogel, graphite oxide cloth, modified fiber, carbon fiber, carbon nanotubes, and kaolin modules. Preferably, the graphite oxide aerogel is folded into the flow equalization mesh 14, which has abundant pores, functional groups that can promote the adsorption of methyl iodine, strong elasticity, easy recovery, high toughness, and is not easy to break, which helps to efficiently adsorb iodine. Preferably, the graphite oxide aerogel is placed in a mold to form a W shape, which does not break or crease, and can fully retain its toughness and integrity, and is not easily damaged during long-term use. More preferably, the W-shaped flow equalization mesh has rounded folds or is wavy in shape, which helps to reduce the generation of dead corners and can avoid the accumulation of filter material fragmentation and dust generation, which would lead to excessive resistance and affect ventilation performance. The oxygen content of the graphite oxide aerogel is preferably 1% to 10%, more preferably 2% to 5%. Graphite oxide aerogel with this oxygen content has low gas release and has little impact on the reaction. Moreover, during repeated high-temperature cycling, it gradually transforms into reduced graphite oxide aerogel, which can further enhance toughness, increase ignition point, and ensure the safety of the iodine adsorber.

[0054] In this embodiment, the interlayer reinforcing rib 6 is provided with microspheres composed of one or more of polystyrene, polyimide, polyetherketone, polycarbonate, and polyethylene terephthalate, and filled with flame retardant.

[0055] According to fire hazard analysis data, nuclear-grade activated carbon releases 35 mJ / kg of heat per unit mass during combustion. The slow-release supplementary impregnating material in the equalization mesh 14 will also eventually pose a fire hazard due to its increased dirt-holding capacity. The interlayer reinforcing ribs 6 are equipped with microspheres containing flame retardants, which can eliminate this hazard. Preferably, the flame retardant is encapsulated in polystyrene microspheres with a melting point between 200℃ and 260℃. This temperature range is not typically encountered in equipment and is several hundred degrees lower than the temperature at the time of a fire. This allows the flame retardant to be released in the early stages of a fire and carried by the airflow to the filter media pack 1.

[0056] The interlayer reinforcing rib 6 can be configured with a structure similar to the filter media pack reinforcing rib 13. The interlayer reinforcing rib 6 can also be C-shaped or L-shaped, with its surface coated with microspheres containing flame retardant. Alternatively, the microspheres containing flame retardant can be uniformly coated on the surface of the air inlet plate 11 facing the interlayer reinforcing rib 6. Preferably, the flame retardant and plastics such as polystyrene are sandwiched on the surface of the air inlet plate 11 facing the interlayer reinforcing rib 6 without blocking the airflow channel. More preferably, filling the filter media pack 1 with the microspheres containing flame retardant and mixing them with the filter media ensures that the surface of the microspheres melts and releases the flame retardant immediately.

[0057] Example 2:

[0058] This embodiment provides an iodine adsorber. The inlet and outlet perforation plates 11 and 12 of the filter media pack 1 have 2mm diameter quincunx-shaped perforations and are covered with PET and PP composite nonwoven fabric. This nonwoven fabric is heat-resistant up to 320℃ and has a resistance of 18Pa@1m / s. The filter media pack reinforcing rib 13 has a hollow structure, with a maifanite diaphragm ring-wrapped with white clay honeycomb module foam. The foam is impregnated with 40% potassium iodide and 70% triethylenediamine. The perforated plate 131 of the filter media pack reinforcing rib 13 has diamond-shaped perforations with a porosity of 25%. The flow equalization mesh 14 has a densely folded end with a thickness of 5mm, a fold count of 1.3 per inch, and a fold height of 31mm in the first third section near the panel; the remaining two-thirds section has a sparsely folded end with a thickness of 3.5mm, a fold count of 0.8 per inch, and a fold height of 27mm in the second third section. The flow equalization mesh 14 is made of graphite oxide aerogel with an oxygen content of 4.5%, impregnated with 5% potassium iodide and 12% triethylenediamine. The interlayer reinforcing ribs 6 are filled with polystyrene microspheres coated with flame retardant, and the sides of these ribs are designed as cuboid perforations with a porosity of 21%. The saturated adsorption capacity of the filter media in this iodine adsorber was measured to be 590 mg / g, which is higher than the 390 mg / g to 460 mg / g range of commonly available nuclear-grade filter media. The initial ignition temperature of the filter media is 374℃, higher than the required 350℃ for fire resistance. The initial adsorption rate of methyl iodine for this iodine adsorber was measured to be 99.49%, meeting the required 97% initial efficiency. No iodine desorption was detected at 180℃, extending the service life by 86%.

[0059] Example 3:

[0060] This embodiment provides an iodine adsorber. The inlet and outlet perforation plates 11 and 12 of the filter media pack 1 have square holes with a pore size of 1.1 mm. High-temperature compacted PP nonwoven fabric is used, which has a temperature resistance of 311℃ and a resistance of 18.2 Pa@1 m / s. The filter media pack reinforcing ribs 13 are hollow structures. PF-coated ceramic-based diaphragms are placed on both sides of PTFE gel foam, which is impregnated with 32% potassium iodide and 81% triethylenediamine. The perforated plate 131 of the filter media pack reinforcing ribs 13 has triangularly staggered perforations with a porosity of 21.7%. The flow equalization mesh 14 has sparsely folded ends in the 3 / 8 section near the panel and the 3 / 8 section away from the panel, with a thickness of 4 mm, a fold count of 0.7 per inch, and a fold height of 29 mm; the middle 2 / 8 section has densely folded ends, with a thickness of 4 mm, a fold count of 1.1 per inch, and a fold height of 29 mm. The flow equalization mesh 14 is made of a carbon nanotube and graphene composite material with a carbon nanotube to graphene ratio of 3:1, impregnated with 5.9% potassium iodide and 15.6% triethylenediamine. The interlayer reinforcing ribs 6 are filled with polyetherketone microspheres coated with flame retardant, and the sides of these reinforcing ribs 6 are designed with a honeycomb-like perforation, resulting in a porosity of 20.5%. The surface of the air inlet plate 11 of the filter media package 1 is coated with polyetherketone microspheres coated with flame retardant, with a layer thickness of 0.4 mm. The saturated adsorption capacity of the filter media contained in this iodine adsorber was measured to be 612 mg / g, which is relatively high compared to the 390 mg / g to 460 mg / g of commonly available nuclear-grade filter media. The initial ignition temperature of the filter media is 370℃, higher than the 350℃ required for fire resistance. The initial adsorption rate of methyl iodine for this iodine adsorber was measured to be 99.51%, meeting the required initial efficiency of 97%. No iodine desorption was detected at 180℃, extending the service life by 87.7%.

[0061] Example 4:

[0062] This embodiment provides an iodine adsorber. Based on the iodine adsorber provided in Example 2, the PET and PP composite nonwoven fabric is replaced with activated carbon fiber. This activated carbon fiber is heat-resistant up to 410℃ and has a resistance of 11.9 Pa@1m / s. The filter media pack reinforcing ribs 13 accommodate the PF diaphragm and corn flour-based columnar particles. The initial adsorption rate of this iodine adsorber for methyl iodine was measured to be 99.18%, meeting the required initial efficiency of 97%. No iodine desorption was detected at 180℃, extending the service life by 79.1%.

[0063] The above are merely preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An iodine adsorber, comprising a housing, characterized in that, The housing includes filter media bags (1) arranged opposite to each other, a number of interlayer reinforcing ribs (6) spaced apart and vertically arranged between the filter media bags (1), a first side plate (4) and a second side plate (5) arranged parallel to the interlayer reinforcing ribs (6) and vertically arranged on both sides of the filter media bags (1), a panel assembly (2) and a sealing plate assembly (3) perpendicular to the interlayer reinforcing ribs (6) and vertically arranged at both ends of the filter media bags (1). The filter media pack (1) includes an air inlet plate (11) close to the interlayer reinforcing rib (6), an air outlet plate (12) away from the interlayer reinforcing rib (6), and a plurality of filter media pack reinforcing ribs (13) spaced vertically between the air inlet plate (11) and the air outlet plate (12) and parallel to the interlayer reinforcing rib (6). The cavity formed by the filter media pack reinforcing ribs (13) is provided with a flow equalization net (14) and filled with filter media. The filter media pack reinforcing rib (13) is formed by two perforated plates (131) vertically arranged between the air inlet plate (11) and the air outlet plate (12) and two wind baffles (132) vertically arranged on the perforated plates (131) to form a cavity. A diaphragm (133) is attached to the perforated plate (131) facing the inside of the cavity, and the cavity is filled with foam. The diaphragm (133) is made of a porous ceramic material, which is open-celled at temperatures below 80°C and closed-celled at temperatures above 120°C. The foam is impregnated or filled with one or both of potassium iodide and triethylenediamine, and the thickness of the foam is greater than that of the cavity.

2. The iodine adsorber according to claim 1, characterized in that, The panel assembly (2) includes a panel perpendicular to the filter media pack (1) and a handle on the panel. The panel has an exhaust gas inlet and a sealing strip on the side where the panel is joined to the housing.

3. The iodine adsorber according to claim 1, characterized in that, The sealing plate assembly (3) includes a filter media pack reinforcing rib sealing plate (31), a bottom plate sealing plate (32) and a cover plate sealing plate (33) stacked vertically to the filter media pack (1). The filter media pack reinforcing rib sealing plate (31) is provided with a buckle corresponding to the filter media pack reinforcing rib (13). The bottom plate sealing plate (32) is provided with a material replacement port corresponding to the filter media pack (1). The bottom plate sealing plate (32) and the cover plate sealing plate (33) are provided with corresponding screw holes.

4. The iodine adsorber according to claim 1, characterized in that, The air inlet plate (11) and air outlet plate (12) are covered with non-woven fabric with a resistance of less than 20 Pa @ 1 m / s and a temperature resistance of greater than or equal to 300 °C.

5. The iodine adsorber according to claim 1, characterized in that, The perforated plate (131) includes side baffles (1311) at both ends of the perforated plate (131), a number of perforations between the side baffles (1311), and side reinforcing ribs (1312) spaced between each group of perforations.

6. The iodine adsorber according to claim 1, characterized in that, The foam is an elastomer formed by extruding dense clay modules.

7. The iodine adsorber according to claim 1, characterized in that, The flow equalization mesh (14) includes a densely folded end close to the panel assembly (2) and a sparsely folded end away from the panel assembly (2), or includes a sparsely folded end close to the panel assembly (2), a sparsely folded end away from the panel assembly (2), and a densely folded end connected between the sparsely folded ends. The flow equalization net (14) is a predetermined distance from the inner wall of the cavity formed by the reinforcing ribs (13) of each filter media pack; The flow equalization mesh (14) is made of one or more of graphene oxide aerogel, graphene aerogel, graphene oxide fabric, modified fiber, carbon fiber, carbon nanotube, and clay module, and is loaded or filled with one or two of potassium iodide and triethylenediamine.

8. The iodine adsorber according to claim 1, characterized in that, The interlayer reinforcing rib (6) is provided with microspheres composed of one or more of polystyrene, polyimide, polyetherketone, polycarbonate, and polyethylene terephthalate and filled with flame retardant.

9. The iodine adsorber according to claim 8, characterized in that, The surface of the air inlet plate (11) facing the interlayer reinforcing rib (6) is coated with the microspheres, and the filter material contains the microspheres.

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