Enhanced multi-pollutant synergistic removal ceramic plate type filter box

Abstract

The invention relates to an enhanced multi-pollutant synergistic removal ceramic plate type filter box, and belongs to the technical field of industrial flue gas purification. The filter box comprises a box frame skeleton, a positioning groove, a ceramic fiber plate, a sealing washer, a pressing plate and a bottom sealing plate, and an air inlet area, a filter reaction area and an air outlet area can be formed in the airflow direction; flange connecting plates are arranged at the bottom of the box frame skeleton, and multi-module series expansion is supported. The ceramic fiber plate takes aluminum silicate fiber as a matrix, is subjected to negative pressure suction filtration and high pressure pressing, is reinforced by silica sol at the periphery, and is internally integrated with a plurality of catalytic functional layers. And the positioning grooves are provided with chamfers and are matched with the rivet nuts, so that the single plate replacement efficiency is high. Through the innovative filter box and filter plate structure, multiple functions of dust removal, denitration, decarburization and the like are integrated in a single ceramic plate unit, the system structure is greatly simplified, the occupied area and equipment investment are reduced, and the problems that a traditional filter pipe is small in filter area and large in equipment occupied area are solved.

Description

Technical Field

[0001] This invention relates to the field of industrial flue gas purification technology, specifically to an enhanced ceramic plate filter box for synergistic removal of multiple pollutants. Background Technology

[0002] With rapid industrial development, air pollution has become increasingly serious. Industrial waste gas contains various pollutants such as dust, sulfur dioxide, nitrogen oxides, heavy metals (such as mercury and lead), and carbon monoxide, which pose a significant threat to the environment and human health. Therefore, purifying industrial waste gas is one of the important tasks of current environmental protection. Currently, mainstream medium- and high-temperature flue gas (above 220℃) purification devices are mainly divided into two categories: Filter bags: mainly made of PTFE and other materials, they remove dust through physical filtration. Some special membranes can be combined with flue gas temperature and spraying or other processes at the front end to help remove gaseous pollutants.

[0003] Ceramic fiber filter tubes: Made of ceramic fiber, they have excellent thermal and mechanical stability under high-temperature conditions. They are mainly used for dust removal, and some can be loaded with a single catalyst to remove specific pollutants (such as nitrogen oxides and dioxins).

[0004] Traditional filter bags have significant limitations: they have a low temperature resistance limit (mostly ≤260℃, with PTFE material being a typical example), requiring cooling treatment in scenarios involving the utilization of waste heat from coal-fired flue gas (flue gas temperature 280-350℃), resulting in a large waste of heat energy; at the same time, acidic components in the flue gas are prone to acid dew point corrosion, leading to frequent damage to the filter bags, with a service life typically <2 years and high maintenance costs.

[0005] While ceramic filter tubes have solved the problems of high temperature resistance (able to withstand temperatures above 350℃) and corrosion resistance, they have the drawback of insufficient rigidity: due to the limitations of material properties, the length of a single filter tube is usually ≤4 meters, resulting in a small filtration area per unit volume (only 60%-70% of that of traditional filter bags). To meet the processing capacity requirements, the size of the equipment needs to be increased, resulting in a large main body and excessively high initial investment. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention aims to provide an enhanced ceramic plate filter box for the synergistic removal of multiple pollutants. By optimizing the structural design of the frame and integrating the functions of the ceramic fiber plates, it solves technical problems in existing technologies such as the contradiction between high temperature resistance and thermal energy waste, the contradiction between small filtration area and large equipment size, and the contradiction between single purification and complex processes. This enables the efficient synergistic removal of multiple pollutants such as dust, nitrogen oxides, carbon monoxide, and heavy metals, improving purification efficiency, extending equipment lifespan, and reducing operating and maintenance costs.

[0007] This invention provides the following technical solution: An enhanced multi-pollutant synergistic removal ceramic plate filter box includes: The box frame includes main longitudinal beams and cross beams, and positioning grooves are provided on both the main longitudinal beams and cross beams; A ceramic fiber board is embedded in the groove. The ceramic fiber board has a single-layer or multi-layer structure. The multi-layer structure includes at least a filter layer and a catalytic functional layer. The catalytic functional layer is coated with one or more catalysts to achieve synergistic removal of multiple pollutants. A sealing gasket is placed between the groove and the ceramic fiber plate; The pressure plate and bottom sealing plate, together with the box frame and ceramic fiber board, form the air inlet zone, the filtration reaction zone and the air outlet zone.

[0008] Furthermore, the bottom of the box frame skeleton is also provided with a flange connection plate, and multiple box frame skeletons are connected in series to extend them.

[0009] Furthermore, the ceramic fiber board uses aluminum silicate fiber as the main raw material, and is formed by negative pressure filtration and high pressure pressing, resulting in a three-dimensional network structure with a large number of micropores inside.

[0010] Furthermore, the ceramic fiber board is surrounded by a reinforcing layer, which is reinforced by impregnation with 30%-50% silica sol and dried at 120°C.

[0011] Furthermore, the catalytic functional layer comprises, in sequence along the airflow direction: a first layer coated with a vanadium-titanium-based catalyst and a tungsten-based additive; a second layer coated with a platinum-based catalyst; and a third layer coated with a composite coating of activated carbon and manganese dioxide.

[0012] Furthermore, the positioning grooves are symmetrically distributed on both sides of the box frame, and the inner side of the grooves is provided with a chamfered guide structure to facilitate the rapid embedding of the ceramic fiber board.

[0013] Furthermore, the frame also includes an upper suspension plate for hoisting and modular installation.

[0014] Furthermore, the sealing gasket is made of aluminum silicate fiber.

[0015] Furthermore, the frame is equipped with rivet nuts, which are used in conjunction with stainless steel bolts to quickly fix the ceramic fiberboard.

[0016] Furthermore, the groove spacing is 30-100mm, and the arrangement density can be adjusted according to the flue gas treatment volume requirements.

[0017] The present invention has the following beneficial technical effects: This invention integrates multiple functions such as dust removal, denitrification, and decarbonization into a single ceramic plate unit through an innovative filter box and filter plate structure. This significantly simplifies the system structure, reduces floor space and equipment investment, and solves the problems of small filtration area and large equipment footprint associated with traditional filter tubes. Compared with traditional ceramic filter tubes and filter bags, this invention has significant structural and functional advantages: the box size is flexibly adjustable, supports flange connection series expansion, and can adapt to different processing scales.

[0018] This invention integrates four functions—dust removal, denitrification, CO removal, and mercury removal—on a single filter surface through a "single-plate multi-layer catalytic" process. This overcomes the limitation of ceramic filter tubes, which can only remove dust in a single process, transforming the treatment of multiple pollutants in high-temperature flue gas from a "multi-stage series" approach to a "single-stage synergistic" approach. This shortens the process, simplifies equipment, reduces energy consumption, and achieves both environmental and economic benefits. The invention achieves multi-effect synergy through multi-layer catalytic functional layers, solving the problem that ceramic filter tubes can only remove pollutants in a single step, and significantly shortening the process.

[0019] This invention adopts a modular design that supports multiple sets of rapid series connection with a bottom flange connection plate, combined with a multi-functional filter plate. This effectively solves the problems of redundant equipment, complex processes, and low efficiency in traditional purification systems, achieving efficient and synergistic purification of multiple pollutants in high-temperature flue gas. It has outstanding technological advancement and engineering application value. The ceramic fiber plate of this invention can be replaced individually (replacement time is reduced to 1 / 3 of that of traditional filter bags), reducing maintenance costs by 40%-50%. It solves the problems of short equipment life and frequent maintenance, with an overall equipment life of ≥5 years. Attached Figure Description

[0020] Figure 1 This is an isometric view of the ceramic plate filter box of the present invention; Figure 2 This is an isometric side view of the box frame skeleton of the present invention; Figure 3 This is a left view of the ceramic plate filter box of the present invention; Figure 4 This is a top view of the ceramic plate filter box of the present invention; Figure 5 This is a schematic diagram of the filtering route of the present invention; Figure 6 This is a schematic diagram of the catalytic functional layer of the present invention; Figure 7 This is a schematic diagram of the ceramic fiberboard reinforcement of the present invention.

[0021] The attached figures are labeled as follows: 1. Box frame; 2. Sealing gasket; 3. Ceramic fiberboard; 4. Pressure plate; 5. Bottom sealing plate; 11. Upper suspension plate; 12. Main longitudinal beam; 13. Cross beam; 14. Flange connection plate; 15. Rivet nuts; 16. Stainless steel bolts. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example An enhanced ceramic plate filter box for synergistic removal of multiple pollutants, such as Figure 1-7 As shown, it consists of a frame skeleton 1, sealing gaskets 2, ceramic fiber boards 3, pressure plates 4, and a bottom sealing plate 5, forming an air inlet zone, a filtration reaction zone, and an air outlet zone (e.g., Figure 5 This achieves a closed-loop process of "air intake - purification - air exhaust" for flue gas.

[0024] like Figure 2 As shown, the box frame 1 consists of an upper suspension plate 11, main longitudinal beams 12, cross beams 13, and flange connection plates 14. The box frame 1 is made of Q345R weathering steel (withstanding temperatures above 350℃ and having corrosion resistance more than 30% better than ordinary carbon steel), and is assembled by welding and bolting.

[0025] Both the main longitudinal beam 12 and the transverse beam 13 are provided with positioning grooves, the dimensions of which are consistent with the dimensions of the ceramic fiber board 3 (tolerance controlled within ±0.5mm), for precise positioning and installation of the ceramic fiber board 3. The positioning grooves are symmetrically distributed on both sides of the box frame 1, and the inner side of the grooves is provided with a 0.5mm chamfered guide structure to facilitate the quick embedding of the ceramic fiber board 3. The sealing gasket 2 is located in the positioning groove and is made of aluminum silicate ceramic fiber to ensure high-temperature sealing.

[0026] The length of the frame 1 is 3 to 12 meters and the width is 0.5 to 1 meter. The positioning grooves formed by the main longitudinal beams 12 and the cross beams 13 are arranged in a longitudinal row, with the spacing between adjacent grooves being 30-100mm. The arrangement density can be adjusted according to the flue gas treatment volume requirements (e.g., a spacing of 50mm is used in high-concentration flue gas scenarios to increase the filtration area).

[0027] The upper suspension plate of the box frame 1 is used for hoisting and modular installation; the bottom of the box frame 1 is provided with a flange connection plate 14, and multiple box frame frames 1 can be connected in series to achieve extension, adapting to different scale industrial processing needs. The box frame 1 is provided with rivet nuts 15, which are used in conjunction with stainless steel bolts 16 for quick fixing of ceramic fiber boards 3.

[0028] The ceramic fiber board 3 is mainly made of aluminum silicate fiber, produced by negative pressure filtration and high pressure pressing. It has high rigidity and a flexural strength ≥1MPa, and has a three-dimensional network structure with a large number of micropores. The ceramic fiber board 3 has a single-layer or multi-layer structure: a single-layer ceramic fiber board only has a dust removal function and is suitable for simple working conditions; a multi-layer ceramic fiber board is divided into a filter layer and a catalytic functional layer. The catalytic functional layer is coated with one or more catalysts to achieve synergistic removal of multiple pollutants. In this embodiment, the catalytic functional layer includes, in sequence along the airflow direction: the first layer is coated with a vanadium-titanium-based catalyst (V2O5-TiO2) and a tungsten-based additive (WO3, accounting for 5%-8%), with a nitrogen oxide removal efficiency ≥90% at 300-350℃; the second layer is coated with a platinum-based catalyst (Pt loading 0.1%-0.3%), which can oxidize carbon monoxide to harmless CO2 with a conversion rate ≥95%; the third layer (top layer) is coated with an activated carbon-manganese dioxide composite coating, with an adsorption rate of heavy metals (such as mercury) ≥90%.

[0029] The ceramic fiber board 3 has a reinforcing layer (20mm wide) around its perimeter, which is reinforced by impregnation with 30%-50% silica sol. After drying at 120℃, the edge flexural strength is increased by 40%-60%, effectively preventing air leakage caused by cracking under the pressure plate 4 during installation. The size and thickness of the ceramic fiber board 3 can be customized according to actual project requirements. Common specifications are 600×600mm and 600×1200mm, with thicknesses of 5 / 10 / 15 / 20mm available.

[0030] In this embodiment, during installation, the sealing gasket 2, ceramic fiber board 3, and pressure plate 4 are installed sequentially and tightened with stainless steel bolts 16. Under the action of the induced draft fan, the dust-laden flue gas undergoes dust removal and catalytic reaction, and finally, clean gas is discharged.

[0031] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An enhanced ceramic plate filter box for synergistic removal of multiple pollutants, characterized in that, include: The box frame includes main longitudinal beams and cross beams, and positioning grooves are provided on both the main longitudinal beams and cross beams; A ceramic fiber board is embedded in the groove. The ceramic fiber board has a single-layer or multi-layer structure. The multi-layer structure includes at least a filter layer and a catalytic functional layer. The catalytic functional layer is coated with one or more catalysts to achieve synergistic removal of multiple pollutants. A sealing gasket is placed between the groove and the ceramic fiber plate; The pressure plate and bottom sealing plate, together with the box frame and ceramic fiber board, form the air inlet zone, the filtration reaction zone and the air outlet zone.

2. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 1, characterized in that, The bottom of the box frame is also provided with a flange connection plate, and multiple box frame frames are connected in series to extend them.

3. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 1, characterized in that, The ceramic fiber board is made of aluminum silicate fiber, which is formed by negative pressure filtration and high pressure pressing, resulting in a three-dimensional network structure with a large number of micropores inside.

4. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 3, characterized in that, The ceramic fiberboard is surrounded by a reinforcing layer, which is reinforced by impregnation with 30%-50% silica sol and dried at 120°C.

5. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 1, characterized in that, The catalytic functional layer comprises, in sequence along the airflow direction: a first layer coated with vanadium-titanium-based catalyst and tungsten-based additive; a second layer coated with platinum-based catalyst; and a third layer coated with a composite coating of activated carbon and manganese dioxide.

6. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 1, characterized in that, The positioning grooves are symmetrically distributed on both sides of the box frame, and the inner side of the grooves is provided with a chamfered guide structure to facilitate the rapid embedding of ceramic fiberboard.

7. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 1, characterized in that, The frame also includes an upper suspension plate for hoisting and modular installation.

8. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 1, characterized in that, The sealing gasket is made of aluminum silicate fiber.

9. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 1, characterized in that, The frame is equipped with rivet nuts, which are used in conjunction with stainless steel bolts to quickly fix the ceramic fiber board.

10. The enhanced multi-pollutant synergistic removal ceramic plate filter box according to claim 1, characterized in that, The spacing between the grooves is 30-100mm, and the arrangement density is adjusted according to the flue gas treatment volume requirements.

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