Wall flow type particulate matter catcher and particulate matter catcher
By using wall-flow particulate matter traps in the particulate matter trap, using multi-layer composite corrugations and gas flow channels formed by planar substrates, the problem of ineffective particulate matter trapping caused by defects in the existing trap structure is solved, and efficient particulate matter trapping and gas filtration are achieved.
Patent Information
- Application Number
- CN202422126728.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-30
Smart Images
Figure CN223026977U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of air pollution control, and particularly relates to a wall-flow particulate collector and a particulate trap. Background Art
[0002] In the field of air pollution control, currently prominent ones include automotive exhaust pollution and industrial waste gas pollution. Whether it is automotive exhaust or industrial waste gas, in addition to harmful gases, they all contain a certain amount of particulate matter. Therefore, it is necessary to develop a particulate trapping device and a harmful gas adsorption device specifically. Currently, general traps are prone to forming blocked pores or overly large holes due to defects in materials and structures, thereby causing gases to be unable to pass through or being unable to trap particulate matter.
[0003] At the same time, in the current prior art, corrugated filters have emerged, but due to the relatively high gas flow rate, they cannot form effective filtration and adsorption.
[0004] In view of this, this application is specifically proposed. Summary of the Invention
[0005] The purpose of this application is to provide a wall-flow particulate collector and a particulate trap to solve the above problems.
[0006] To achieve the above objectives, this application specifically adopts the following technical solutions:
[0007] A wall-flow particulate collector includes multiple layers of gas flow channels laminated together. Each layer of the gas flow channels includes a corrugated substrate and a flat substrate laminated together, and the corrugated substrate and the flat substrate form adjacent corrugated channels; each of the corrugated channels and the corrugated channel adjacent to and connected to it in a plane has opposite closed ends along the gas inlet and outlet directions.
[0008] Preferably, both the corrugated substrate and the flat substrate are high-temperature resistant fibers.
[0009] Optionally, the high-temperature resistant fibers include one or a combination of multiple of glass fiber, ceramic fiber, quartz fiber, alumina fiber, mullite fiber, or cordierite fiber.
[0010] Optionally, the laminated gas flow channels include a laminated structure or a wound structure.
[0011] Optionally, in the laminated structure, the wave crests between adjacent layers of corrugated channels are staggered or coaxial.
[0012] Optionally, in the wound structure, the wave crests and wave troughs between adjacent layers of corrugated channels are staggered and connected.
[0013] Preferably, the front and back surfaces of the corrugated substrate and the planar substrate are both coated with a catalyst layer.
[0014] Optionally, the gas flow channels formed by combining the multiple layers are wrapped with a cylinder along the axial outer periphery.
[0015] The present application also provides a method for preparing a wall-flow particle capture assembly:
[0016] S1: Pressing a flat high-temperature resistant fiber substrate into corrugations of different specifications, and compounding the pressed corrugated substrate with a flat substrate to form a layered channel composed of corrugated channels adjacent to each other.
[0017] S2: using planar high temperature resistant fibers to completely or alternately seal one side opening of the corrugated channels adjacent to each other.
[0018] S3: Prepare a circular or square integral capture body by cross-rolling or stacking, so that the inlet and outlet channels of the integral capture body are alternately closed.
[0019] Furthermore, the cross-rolling to prepare the circular integral capture group can be that the open side of one layer of the layered channel and the closed side of another layer of the layered channel are pressed or bonded together, the closed side of one layer of the layered channel and the open side of another layer of the layered channel are pressed or bonded together, and then they are rolled into a roll along the radial direction of the channel.
[0020] The stacking method for preparing the square integral capture group can be that two sheets of the layered channels are pressed or bonded in the same direction from top to bottom; the open side of one sheet of the layered channel is pressed or bonded with the closed side of the adjacent sheet of the layered channel, and the closed side of the sheet of the layered channel is pressed or bonded with the open side of the adjacent sheet of the layered channel, and the layers are pressed or bonded along the plane direction of the layered channel. When the open side of the sheet of the layered channel corresponds to the closed side of the adjacent sheet of the layered channel, the corrugated channels of the two sheets can correspond one to one or be staggered.
[0021] The stacking method for preparing the square integral capture group can also be that two sheets of the layered channels are pressed or bonded in the same direction from top to bottom; the open side of one sheet of the layered channel and the open side of an adjacent sheet of the layered channel are pressed or bonded together, and the closed side of one sheet of the layered channel and the closed side of an adjacent sheet of the layered channel are pressed or bonded together, and the layers are stacked, pressed or bonded along the plane direction of the layered channels, and the corrugated channels of the two sheets correspond to each other one by one.
[0022] Furthermore, the cross-rolling and stacking method can form new corrugated channels between layers that are adjacent to the original corrugated channels.
[0023] The square monolithic trap body prepared by the above lamination method may also be that two of the laminated channels are pressed or bonded in opposite directions up and down, that is, the wave crest of the upper one corresponds to the wave trough of the lower one; the open side of one of the laminated channels and the closed side of the adjacent laminated channel are pressed or bonded together, and the closed side of one of the laminated channels and the open side of the adjacent laminated channel are pressed or bonded together, and they are laminated and pressed or bonded in the plane direction of the laminated channel.
[0024] By the above method, it can be ensured that each of the corrugated channels and the corrugated channels adjacent to and connected in parallel with it have opposite closed ends in the gas inlet and outlet directions.
[0025] S4: Immerse the monolithic trap body obtained in S3 in a solution containing a binder, and remove the excess binder by compressed air or vacuum after immersion.
[0026] S5: Dry the monolithic trap body obtained in S4 in hot air at 80 - 250 °C, and then sinter it at a high temperature of 200 - 650 °C to obtain a wall - flow trap body.
[0027] Preferably, the temperature of the hot air is 100 - 220 °C, and more preferably 120 - 200 °C.
[0028] Preferably, the temperature of the high - temperature sintering is 300 - 550 °C, and more preferably 350 - 500 °C.
[0029] Preferably, a vacuum coating function or a catalytic material is applied to the wall - flow trap body obtained in S5, then it is dried in hot air at 80 - 250 °C, and then calcined at 200 - 650 °C to obtain a particulate matter trap body capable of eliminating pollutants.
[0030] Preferably, the temperature of the hot air is 100 - 220 °C, and more preferably 120 - 200 °C.
[0031] Preferably, the temperature of the calcination is 300 - 550 °C, and more preferably 350 - 500 °C.
[0032] Optionally, the binder includes one or more of silica sol, alumina sol, silica - alumina sol, alumina sol, pseudo - boehmite sol, zirconia sol or titania sol.
[0033] This application also provides a particulate matter trap, including the wall - flow particulate matter trap body described above.
[0034] Optionally, the particulate matter trap includes two forms: a stationary - source particulate matter trap and a mobile - source particulate matter trap; the stationary - source particulate matter trap includes the laminated structure, and the mobile - source particulate matter trap includes the wound structure.
[0035] Advantages of the present application:
[0036] The wall-flow particulate collector provided by the present application uses a high-temperature-resistant fiber as the base material, which can withstand high-temperature thermal shock. The flue gas / exhaust gas flow channels are obtained by compounding corrugated and flat base materials, and one end of the channels is synchronously closed, and then the particulate collector and the integral particulate filter are prepared by rolling, cross-laminating and other methods. After the flue gas / exhaust gas containing particulate matter enters the channels, it flows out through the pore walls, and the particulate matter is intercepted on the pore walls of the collector, achieving the purpose of particulate matter capture.
[0037] The wall-flow particulate collector provided by the present application can adjust the pore size and pore wall structure according to the particulate matter in the flue gas / exhaust gas to efficiently capture particulate matter. By coating a catalyst or functional material on the surface of the particulate collector, pollutants in the flue gas / exhaust gas can be synergistically removed.
[0038] The preparation method of the wall-flow particulate collector provided by the present application uses the method of pressing or bonding the open side and the closed side of adjacent layers together during rolling or laminating to form a structure in which the corrugated channels do not lead straight through. The gas must pass through the pore walls, achieving efficient filtration and particle capture while also having a very high preparation efficiency of the collector. Description of the drawings
[0039] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0040] Figure 1 It is a schematic diagram of the gas flow direction of the wall-flow particulate collector of the present application.
[0041] Figure 2 It is a cross-sectional view of the wall-flow particulate collector in a laminated structure in Example 1.
[0042] Figure 3 For Figure 2 Partial enlarged schematic diagram.
[0043] Explanation of reference numerals:
[0044] 1. Closed side of the corrugated channel; 2. Open side of the corrugated channel; 3. Flat base material; 4. Corrugated base material. Specific embodiments
[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.
[0046] Embodiment 1
[0047] A wall-flow particulate collector, as Figure 2 and 3 shown, includes multiple layers of gas flow channels laminated together. The multiple layers of gas flow channels laminated together are wrapped with a cylinder along the outer periphery in the axial direction and can be used as a particulate filter. Each layer of the gas flow channels includes a corrugated substrate 4 and a flat substrate 3 laminated together. The corrugated substrate 4 and the flat substrate 3 form adjacent corrugated channels; each of the corrugated channels and the corrugated channel adjacent to it and connected in a plane have opposite closed ends in the gas inlet and outlet direction. As Figure 1 shown, the gas enters from the open side. When it encounters the closed side, the particulate matter cannot pass through. Then the gas passes through the surrounding pore walls, while the particulate matter remains on the pore walls.
[0048] Among them, both the corrugated substrate 4 and the flat substrate 3 are made of fiberglass.
[0049] The gas flow channels laminated together have a laminated structure, as Figure 2 and 3 shown, and can be used as a fixed-source particulate filter. In the laminated structure, the peaks of adjacent corrugated channels are coaxial. Looking from one side of the gas flow channels, the closed side 1 of the corrugated channels and the open side 2 of the corrugated channels are arranged alternately. Looking from the other side of the gas flow channels, it is the same.
[0050] In some preferred embodiments, catalyst layers are coated on the front and back surfaces of the corrugated substrate and the flat substrate.
[0051] The preparation method of the wall-flow particulate collector is as follows:
[0052] S1: Press the flat fiberglass substrate into corrugated shapes of different specifications. The pressed corrugated substrate 4 is laminated with the flat substrate 3 of the same fiberglass material to form a layered channel composed of adjacent corrugated channels.
[0053] S2: Use the flat fiberglass to completely seal one side of the orifices of the adjacent corrugated channels.
[0054] S3: Bond the two laminated channels in opposite directions, i.e., the wave crests of the upper one correspond to the wave troughs of the lower one; bond the open side of one laminated channel and the closed side of an adjacent laminated channel together, and bond the closed side of one laminated channel and the open side of an adjacent laminated channel together, and stack and bond them in the plane direction of the laminated channel. This makes the inlet and outlet channels of the monolithic trap alternately closed, that is, each corrugated channel and the corrugated channel adjacent to it and connected in parallel have opposite closed openings in the gas inlet and outlet directions.
[0055] S4: Immerse the monolithic trap obtained in S3 in a solution containing silica sol, and after immersion, use compressed air to remove the excess silica sol for reinforcement.
[0056] S5: Dry the monolithic trap obtained in S4 in hot air at 130°C, and then sinter it at a high temperature of 450°C to obtain a wall-flow trap.
[0057] When coating the catalyst layer, a catalytic material is vacuum-coated on the wall-flow trap obtained in S5, then dried in hot air at 130°C, and then calcined at 450°C to obtain a particulate trap capable of eliminating pollutants.
[0058] Example 2
[0059] A wall-flow particulate trap includes multiple layers of gas flow channels laminated together. The multiple layers of gas flow channels laminated together are wrapped around the outer periphery in the axial direction by a cylinder, and a particulate trap can be formed. Each layer of the gas flow channels includes a corrugated substrate and a flat substrate laminated together, and the corrugated substrate and the flat substrate form adjacent corrugated channels; each corrugated channel and the corrugated channel adjacent to it and connected in parallel have opposite closed openings in the gas inlet and outlet directions. When gas enters from the open side and encounters the closed side, the particulate matter cannot pass through, and then the gas passes through the surrounding pore walls, while the particulate matter remains on the pore walls.
[0060] Among them, both the corrugated substrate and the flat substrate are made of ceramic fiber material.
[0061] The laminated gas flow channels are of a wound structure, and the wave crests and wave troughs of adjacent corrugated channels are staggered, and it can be used as a particulate trap for mobile sources.
[0062] The preparation method of the wall-flow particulate trap is as follows:
[0063] S1: Press the flat ceramic fiber substrate into corrugated shapes of different specifications, and laminate the pressed corrugated substrate with a flat substrate of the same ceramic fiber material to form a laminated channel composed of adjacent corrugated channels.
[0064] S2: Use planar ceramic fibers to completely seal one orifice of the adjacent corrugated channels.
[0065] S3: Press or bond the open side of one layer of channels and the closed side of another layer of channels together, and press or bond the closed side of one layer of channels and the open side of another layer of channels together. Then wind them into a roll along the radial direction of the channels to form an integral trapping body. New corrugated channels adjacent to the original corrugated channels can be formed between layers. At the same time, for each corrugated channel and the adjacent corrugated channel connected in parallel, they have opposite closed ends along the gas inlet and outlet direction.
[0066] S4: Immerse the integral trapping body obtained in S3 in a solution containing silica sol. After immersion, use compressed air to remove the excess silica sol for reinforcement.
[0067] S5: Dry the integral trapping body obtained in S4 in hot air at 130°C, and then sinter it at a high temperature of 450°C to obtain a wall-flow trapping body.
[0068] When coating the catalyst layer, the catalytic material is vacuum-coated on the wall-flow trapping body obtained in S5, then dried in hot air at 130°C, and then calcined at 450°C to obtain a particulate matter trapping body capable of eliminating pollutants.
[0069] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as these combinations of technical features do not conflict, they should be considered as within the scope described in this specification. The above embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.
Claims
1. A wall-flow particle collector, characterized in that: It comprises a plurality of gas flow channels composited together, each layer of the gas flow channels comprises a corrugated substrate and a planar substrate composited together, and the corrugated substrate and the planar substrate form corrugated channels adjacent to each other; Each of the corrugated channels and the corrugated channels adjacent to and connected to it have opposite closed openings along the gas inlet and outlet directions.
2. The wall-flow particle collector according to claim 1, characterized in that: The corrugated substrate and the planar substrate are both high temperature resistant fibers.
3. The wall-flow particle collector according to claim 2, characterized in that: The high temperature resistant fiber includes a composite of one or more of glass fiber, ceramic fiber, quartz fiber, alumina fiber, mullite fiber or cordierite fiber.
4. The wall-flow particle collector according to claim 1, characterized in that: The composite gas flow channels include a stacked structure or a winding structure.
5. The wall-flow particle collector according to claim 4, characterized in that: In the stacked structure, the wave crests between the corrugated channels of adjacent layers are staggered or coaxial.
6. The wall-flow particle collector according to claim 4, characterized in that: In the winding structure, the wave crests and wave troughs between the corrugated channels of adjacent layers are connected alternately.
7. The wall-flow particle collector according to claim 1, characterized in that: The front and back surfaces of the corrugated substrate and the planar substrate are both coated with catalyst layers.
8. The wall-flow particle collector according to claim 1, characterized in that: The gas flow channels composed of multiple layers are wrapped with a cylinder along the axial outer periphery.
9. A particle collector, characterized in that: The invention comprises the wall-flow particle capture device as described in any one of claims 1 to 8.
10. The particle collector according to claim 9, characterized in that: It comprises a fixed source particle collector and a mobile source particle collector; the fixed source particle collector comprises the stacked structure, and the mobile source particle collector comprises the winding structure.