Modular desulfurization, denitrification, VOC removal and dust removal integrated system

Abstract

The application discloses a modular desulfurization, denitration, VOC removal and dust removal integrated system, which comprises a dust gas chamber, at least one air inlet is formed in the top of the dust gas chamber, and at least one ash outlet is formed in the bottom of the dust gas chamber; an air duct, an air outlet end of the air duct is communicated with the air inlet of the dust gas chamber; a desulfurization catalyst spraying device arranged in the air duct; a plurality of filter pieces loaded with denitration catalysts, the plurality of filter pieces are arranged in the dust gas chamber, and gaps exist between two adjacent filter pieces; at least one clean gas chamber, the clean gas chamber is arranged on one side of the dust gas chamber, and air flow in the dust gas chamber enters the clean gas chamber after flowing through the filter pieces; and an air outlet duct, an air inlet end of the air outlet duct is communicated with an air outlet of the clean gas chamber. The modular desulfurization, denitration, VOC removal and dust removal integrated system can effectively reduce dust raising and realize the synergistic treatment of desulfurization, denitration and dust removal, and has low overall investment and small land occupation.

Description

Technical Field

[0001] This invention relates to the field of flue gas dust removal technology, and more specifically, to a modular integrated system for desulfurization, denitrification, VOC removal, and dust removal. Background Technology

[0002] With the increasing global emphasis on environmental protection, environmental protection and energy conservation and emission reduction are key tasks for the present and for a long time to come. my country has listed the energy conservation and environmental protection industry as the top strategic emerging industry. Currently, environmental protection and pollution control are of paramount importance for industrial enterprises. The main pollutants generated by industrial enterprises include dust, sulfides, nitrogen oxides, and VOCs. Currently, the treatment of these pollutants is achieved through single-system facilities: dust collectors collect and control dust emissions, desulfurization devices achieve sulfide emission standards, denitrification facilities control nitrogen oxide emissions, and VOC purification devices remove VOCs.

[0003] Currently, the problems with this single-facility approach are: first, each facility system is set up and operated independently, resulting in very large overall equipment investment and causing financial strain on the user; second, the various treatment facilities are arranged in series, occupying a large area and wasting significant land resources; and third, the operation and maintenance costs of the entire system are high, requiring substantial investment of human, material, and financial resources. Therefore, there is an urgent need for systematic, highly efficient multi-pollutant synergistic treatment technologies and equipment. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a modular integrated system for desulfurization, denitrification, VOC removal and dust removal. The structural design of this modular integrated system can effectively reduce dust and achieve synergistic treatment of desulfurization, denitrification and dust removal.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A modular integrated system for desulfurization, denitrification, VOC removal, and dust removal includes:

[0007] A dust chamber, wherein at least one air inlet is provided at the top of the dust chamber and at least one dust outlet is provided at the bottom of the dust chamber;

[0008] An air inlet duct, wherein the air outlet of the air inlet duct is connected to the air inlet of the dust chamber;

[0009] The desulfurization catalyst injection device is installed inside the air inlet duct;

[0010] Multiple filter elements loaded with denitrification catalyst are disposed inside the dust chamber, and there is a gap between two adjacent filter elements. The filter elements are provided with denitrification catalyst inside and / or on the surface.

[0011] At least one clean air chamber is provided on one side of the dust chamber, and the airflow in the dust chamber flows through the filter element and then enters the clean air chamber;

[0012] An air outlet duct, wherein the air inlet of the air outlet duct is connected to the air outlet of the clean air chamber.

[0013] Preferably, the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system further includes a pre-charging device, which is located upstream of the plurality of filter elements.

[0014] Preferably, the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system further includes multiple guide plates disposed in the dust chamber, the guide plates being inclined relative to the side wall of the dust chamber.

[0015] Preferably, the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system further includes a flow guiding device installed in the air inlet duct. The flow guiding device is located upstream of the desulfurization catalyst injection device, and the flow guiding device guides the airflow to spiral downward.

[0016] Preferably, in the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system, the filter element is a filter bag, and the filter bag is provided with a denitrification catalyst module.

[0017] Preferably, in the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system, the air inlet pipe includes an air inlet pipe and an air inlet box connected in sequence to the air outlet end of the air inlet pipe; the air outlet pipe includes an air outlet pipe and an air outlet box connected in sequence to the air inlet end of the air outlet pipe.

[0018] Both the air inlet box and the air outlet box are horn-shaped. The ventilation cross-section of the air inlet box gradually increases along the direction closer to the dust chamber, and the ventilation cross-section of the air outlet box gradually increases along the direction closer to the clean air chamber.

[0019] Preferably, in the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system, there are two clean air chambers, which are respectively arranged on opposite sides of the dust chamber.

[0020] Preferably, the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system further includes a VOC catalyst module, which is disposed in the clean air chamber.

[0021] Preferably, the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system further includes an ash hopper connected to the ash outlet of the dust chamber and an ash conveying device connected to the bottom of the ash hopper.

[0022] Preferably, in the above-mentioned modular desulfurization, denitrification, VOC removal and dust removal integrated system, the dust chamber and the clean air chamber are integrated into the same box, and the dust chamber and the clean air chamber are separated by a partition.

[0023] When using the modular integrated desulfurization, denitrification, VOC removal, and dust removal system provided above, the dust-laden airflow enters the dust chamber through the inlet duct and the air inlet at the top of the dust chamber. The desulfurization catalyst injection device inside the inlet duct atomizes the desulfurizing agent, specifically into droplets with a diameter of 0.05-0.8 mm. After the flue gas enters the desulfurization atomization absorption zone inside the inlet duct, it reacts with the desulfurizing agent, completing the removal of sulfides from the flue gas. The gas in the dust chamber then enters multiple filter elements for filtration. Simultaneously, the denitrification catalyst loaded on the filter elements reacts with nitrogen oxides in the flue gas, completing the removal of nitrogen oxides. The airflow after denitrification filtration through multiple filter elements enters the clean air chamber, and finally, the gas in the clean air chamber is discharged through the outlet duct.

[0024] Preferably, the above-mentioned modular desulfurization, denitrification, VOC removal, and dust removal integrated system may further include a VOC (volatile organic compound) catalyst module, which is disposed in the clean gas chamber. The VOC catalyst module 19 is used to remove VOCs from the flue gas. Each clean gas chamber is equipped with a VOC catalyst module 19. A sponge-like VOC catalyst module 19 can be used. The specific surface area of ​​the sponge-like VOC catalyst module 19 is more than 10 times that of the honeycomb-like VOC catalyst module 19, which can reduce space occupation and improve the catalytic efficiency of VOCs.

[0025] In the aforementioned filtration process, the dust-laden airflow enters the dust chamber through the inlet at the top. This ensures the airflow direction aligns with the falling direction of the dust, allowing it to descend to the ash outlet at the bottom of the chamber, facilitating dust settling and effectively reducing dust emissions. Furthermore, the flue gas reacts with the desulfurizing agent within the inlet duct, removing sulfides. Within the dust chamber, it reacts with the denitrification catalyst loaded on the filter elements, achieving denitrification. Ultimately, this process achieves synergistic treatment of dust removal, desulfurization, and denitrification, resulting in low overall investment, a small footprint, and significantly improved flue gas treatment efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the modular desulfurization, denitrification, VOC removal, and dust removal integrated system provided in an embodiment of the present invention;

[0028] Figure 2 This is the main view of the single-layer modular desulfurization, denitrification, VOC removal, and dust removal integrated system provided in the embodiments of the present invention;

[0029] Figure 3 This is a schematic diagram of a three-layer modular desulfurization, denitrification, VOC removal, and dust removal integrated system provided in an embodiment of the present invention.

[0030] exist Figure 1-3 middle:

[0031] 1—Modular integrated desulfurization, denitrification, VOC removal, and dust removal system; 2—Inlet duct; 3—Inlet box; 4—Pre-charge device; 5—Guide plate; 6—Dust chamber; 7—Filter element; 8—Metal frame; 9—Vibration device; 10—Left clean air chamber; 11—Left air box; 12—Left outlet duct; 13—Right clean air chamber; 14—Right air box; 15—Right outlet duct; 16—Ash hopper; 17—Ash conveying device; 18—Steel column; 19—VOC catalyst module; 20—Single-layer modular integrated desulfurization, denitrification, VOC removal, and dust removal system; 30—Desulfurization catalyst injection device; 31—Guide device. Detailed Implementation

[0032] The purpose of this invention is to provide a modular integrated system for desulfurization, denitrification, VOC removal, and dust removal. The structural design of this modular integrated system can effectively reduce dust generation and achieve synergistic treatment of desulfurization, denitrification, and dust removal.

[0033] 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.

[0034] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Please see Figures 1-3 The modular desulfurization, denitrification, VOC removal and dust removal integrated system provided by the present invention includes a dust chamber 6, an air inlet duct, a desulfurization catalyst injection device 30, multiple filter elements 7, at least one clean air chamber and an air outlet duct.

[0036] The dust chamber 6 has at least one air inlet at its top. Specifically, the top of the dust chamber 6 can be open to form a single air inlet, the ventilation section of which covers the entire top of the dust chamber 6. Alternatively, the top of the dust chamber 6 can have multiple air inlets. Dust-laden air flows into the dust chamber 6 through the air inlet at its top. The bottom of the dust chamber 6 has at least one ash outlet, through which dust is discharged.

[0037] The air outlet of the air inlet duct is connected to the air inlet of the dust chamber 6, and the dust-laden airflow in the air inlet duct enters the dust chamber 6 through the air outlet of the air inlet duct.

[0038] The desulfurization catalyst injection device 30 is installed inside the air inlet duct and is used to atomize and spray out the desulfurization catalyst.

[0039] Multiple filter elements 7 are disposed inside the dust chamber 6, with gaps between adjacent filter elements 7. That is, all filter elements 7 are fixed inside the dust chamber 6, and at least one end of each filter element 7 is connected to the side wall of the dust chamber 6. A denitrification catalyst is loaded on each filter element 7; specifically, the denitrification catalyst is disposed inside and / or on the surface of each filter element 7.

[0040] Preferably, the dust chamber 6 is cuboid in shape, and the multiple filter elements 7 are arranged parallel to each other along their length. The axial direction of the filter element 7 can be horizontal, or the angle between the axial direction of the filter element 7 and the horizontal plane can be acute; this is not limited here.

[0041] There are one or more clean air chambers. The clean air chamber is located on one side of the dust chamber 6, and the airflow in the dust chamber 6 enters the clean air chamber after passing through the filter element 7.

[0042] The air inlet of the air outlet duct is connected to the air outlet of the clean air chamber, meaning that the filtered air entering the clean air chamber can be discharged through the air outlet duct.

[0043] When using the modular integrated desulfurization, denitrification, VOC removal, and dust removal system provided above, the dust-laden airflow enters the dust chamber 6 through the inlet duct and the air inlet at the top of the dust chamber 6. The desulfurization catalyst injection device 30 in the inlet duct atomizes the desulfurizing agent, specifically atomizing it into droplets with a diameter of 0.05-0.8 mm. After the flue gas enters the desulfurizing agent atomization absorption zone in the inlet duct, it contacts and reacts with the desulfurizing agent, completing the removal of sulfides from the flue gas. The gas in the dust chamber 6 enters multiple filter elements 7 for filtration. At the same time, the denitrification catalyst loaded on the filter elements 7 reacts with the nitrogen oxides in the flue gas, completing the removal of nitrogen oxides from the flue gas. The airflow after denitrification filtration through multiple filter elements 7 enters the clean air chamber, and finally, the gas in the clean air chamber can be discharged through the outlet duct. In the aforementioned filtration process, the dust-laden airflow enters the dust chamber 6 through the air inlet at the top. This ensures the airflow direction aligns with the falling direction of the dust, allowing it to descend to the ash outlet at the bottom of the dust chamber 6, thus facilitating dust settling and effectively reducing dust emissions. Furthermore, the flue gas reacts with the desulfurizing agent within the inlet duct, removing sulfides. Within the dust chamber 6, it reacts with the denitrification catalyst loaded on the filter element 7, achieving denitrification. Ultimately, this process achieves synergistic treatment of dust removal, desulfurization, and denitrification, resulting in low overall investment, a small footprint, and significantly improved flue gas treatment efficiency.

[0044] The dust chamber 6, the clean air chamber, and their internal devices together form a modular integrated desulfurization, denitrification, VOC removal, and dust removal system 1.

[0045] In one specific embodiment, the aforementioned modular desulfurization, denitrification, VOC removal, and dust removal integrated system may further include a pre-charging device 4, which is located upstream of the filter element 7. That is, the pre-charging device 4 is located upstream of multiple filter elements 7. The dust-laden airflow entering the dust chamber 6 through the air inlet at the top of the dust chamber 6 first passes through the pre-charging device 4 before passing through the filter element 7. Specifically, the pre-charging device 4 can be located inside the dust chamber 6, between the air inlet of the dust chamber 6 and the filter element 7. By placing the pre-charging device 4 below the air inlet of the dust chamber 6, the dust particles can be charged. The charged fine dust particles can agglomerate into larger particles; some fall directly to the ash outlet with the airflow, while others form a loosely structured dust layer on the surface of the filter element 7. Simultaneously, the charged dust facilitates collection, significantly increasing the dust concentration at the inlet of the dust chamber 6. Test data shows that the modular desulfurization, denitrification, VOC removal and dust removal integrated system with pre-charge device 4 can improve filtration efficiency by an order of magnitude, while significantly reducing filtration resistance, which is conducive to improving filtration speed and extending the service life of filter element 7.

[0046] The pre-charged device 4 is fixed inside the dust chamber 6, and it can be fixed to the dust chamber 6 by means of bolt connection, snap-fit, etc.

[0047] In another specific embodiment, the aforementioned modular desulfurization, denitrification, VOC removal, and dust removal integrated system further includes multiple guide plates 5 disposed within the dust chamber 6, and the multiple guide plates 5 are inclined relative to the side wall of the dust chamber 6. That is, the guide plates 5 have an angle with both the side wall and the bottom wall of the dust chamber 6. The multiple guide plates 5 are fixed inside the dust chamber 6, and there is a gap between two adjacent guide plates 5 to allow airflow to pass through. With this arrangement, the dust-laden flue gas enters the dust chamber 6 under the guidance of the guide plates 5, and the flow direction of the dust-laden flue gas changes after passing through the guide plates 5. This not only overcomes the disadvantage of dust directly scouring the filter element 7 and easily wearing it down, but also makes the airflow distribution inside the dust chamber 6 more uniform and avoids the existence of dead air inlets.

[0048] The guide plate 5 is fixed inside the dust chamber 6. Specifically, the guide plate 5 can be bolted, snapped, or welded to the dust chamber 6, which is not limited here.

[0049] Preferably, the multiple guide vanes 5 can be arranged along a continuous bend line, or the included angle between the guide vanes 5 and the side wall of the dust chamber 6 is not limited, and the shape, tilt angle and position of the multiple guide vanes 5 can be set according to the actual situation.

[0050] Furthermore, it also includes a flow guiding device 31 disposed within the air inlet duct. The flow guiding device 31 is located upstream of the desulfurization catalyst injection device 30, and the flow guiding device 31 guides the airflow downward in a spiral. The airflow channel within the flow guiding device 31 is spiral-shaped, so that the incoming airflow spirals downward along the flow guiding device 31. Preferably, the desulfurization catalyst is a sodium hydroxide solution.

[0051] Multiple nozzles of the desulfurization catalyst injection device 30 are evenly arranged along the circumference of the air inlet channel to ensure that the flue gas fully contacts the desulfurization catalyst, resulting in higher desulfurization efficiency. The axis of the flow guiding device 31 is aligned with the axis of the air inlet duct, which facilitates the diffusion of the incoming air.

[0052] In another embodiment, the filter element can be a filter bag. Of course, the filter element can also be a filter cartridge, and this is not a limitation.

[0053] Furthermore, a denitrification catalyst module is installed inside the filter element. Flue gas enters the filter element from its outer surface for filtration, and the denitrification catalyst module inside reacts with nitrogen oxides in the flue gas to achieve denitrification.

[0054] When the filter element is a filter bag, the denitrification catalyst module is located inside the filter bag.

[0055] Of course, the denitrification catalyst can also be placed on the filter media of the filter element, which is not limited here.

[0056] It should be noted that the side wall of the dust chamber 6 is provided with a through hole that communicates with the clean air chamber. The air outlet of the filter element is connected to the through hole on the side wall of the dust chamber 6, and the air outlet of the filter element is sealed to the side wall of the dust chamber 6 to ensure that during normal operation, the gas in the dust chamber 6 enters the interior of the filter element, and the gas inside the filter element flows into the clean air chamber.

[0057] Preferably, the air inlet duct includes an air inlet pipe 2 connected in sequence and an air inlet box 3 connected to the air outlet end of the air inlet pipe 2. The dust-laden airflow enters the dust chamber 6 after passing through the air inlet pipe 2 and the air inlet box 3 in sequence. The air inlet box 3 can be trumpet-shaped, and the ventilation cross-section of the air inlet box 3 gradually increases along the direction closer to the dust chamber 6. That is, the ventilation cross-section of the air outlet end of the air inlet box 3 is larger than the ventilation cross-section of the air inlet end. This arrangement can further ensure that the airflow entering the dust chamber 6 is more uniform. The flow guiding device 31 and the desulfurization catalyst injection device 30 are both installed inside the air inlet pipe 2.

[0058] The air outlet duct includes an outlet pipe connected in sequence and an outlet box connected to the air inlet end of the outlet pipe. The airflow passes through the outlet box and the outlet pipe in sequence before being discharged. The outlet box can be funnel-shaped, and the ventilation cross-section of the outlet box gradually increases along the direction closer to the clean air chamber. This design can further ensure a more uniform airflow.

[0059] Preferably, there are two clean air chambers, which are respectively located on opposite sides of the dust chamber 6. The two clean air chambers are a left clean air chamber 10 and a right clean air chamber 13. Both the left clean air chamber 10 and the right clean air chamber 13 are connected to the air outlet of the filter element 7 in the dust chamber 6. There are also two air outlet ducts, namely a left air outlet duct 12 and a right air outlet duct 15, and two air outlet boxes, namely a left air outlet box 11 and a right air outlet box 14. The left air outlet box 11 and the left air outlet duct 12 are connected to the interior of the left clean air chamber 10, and the right air outlet box 14 and the right air outlet duct 15 are connected to the interior of the right clean air chamber 13.

[0060] The left air outlet box 11 can be connected to the top wall of the left clean air chamber 10, and the right air outlet box 14 can be connected to the top wall of the right clean air chamber 13. No limitation is made here.

[0061] Preferably, the above-mentioned modular desulfurization, denitrification, VOC removal, and dust removal integrated system may further include a VOC (volatile organic compound) catalyst module, which is disposed in the clean gas chamber. The VOC catalyst module 19 is used to remove VOCs from the flue gas. Each clean gas chamber is equipped with a VOC catalyst module 19. A sponge-like VOC catalyst module 19 can be used. The specific surface area of ​​the sponge-like VOC catalyst module 19 is more than 10 times that of the honeycomb-like VOC catalyst module 19, which can reduce space occupation and improve the catalytic efficiency of VOCs.

[0062] Furthermore, the aforementioned modular desulfurization, denitrification, VOC removal, and dust removal integrated system also includes a metal frame 8 disposed within the dust chamber 6 and a rapping device 9 disposed on the metal frame 8. The rapping device 9 can drive the metal frame 8 and the filter element 7 to vibrate. At least one filter element 7 is fixedly connected to the metal frame 8. The filter element 7 located within the metal frame 8 is fixedly connected to the metal frame 8. The metal frame 8 and the filter element 7 inside it form a single unit. One side of the metal frame 8 can be fixedly connected to the inner wall of the dust chamber 6. When the rapping device 9 is activated, the dust on the surface of the filter element 7 is vibrated, causing the accumulated dust to fall off, achieving dust removal and regeneration.

[0063] Specifically, there are two metal frames 8, namely a left metal frame and a right metal frame. The left and right metal frames are fixedly connected to the left and right sides of the dust chamber 6, respectively. The air outlet of the filter element 7 in the left metal frame is connected to the left clean air chamber 10, and the air outlet of the filter element 7 in the right metal frame is connected to the right clean air chamber 13. The left end of the filter element 7 in the left metal frame is connected to the left side of the dust chamber 6, and the right end of the filter element 7 in the left metal frame is closed or covered by filter material. The right end of the filter element 7 in the right metal frame is connected to the right side of the dust chamber 6, and the left end of the filter element 7 in the right metal frame is closed or covered by filter material.

[0064] In this embodiment, the denitrification catalyst module can be sponge-like. The surface area of ​​the sponge-like denitrification catalyst module is more than 10 times that of the honeycomb-like denitrification catalyst, which can reduce space occupation and improve the catalytic efficiency of nitrogen oxides. The denitrification catalyst module can use a low-temperature denitrification catalyst with a temperature range of 140-220℃, which can immediately exert its denitrification effect at 140℃.

[0065] To collect the dust falling to the ash outlet in a timely manner, the aforementioned modular desulfurization, denitrification, VOC removal, and dust removal integrated system also includes an ash hopper 16 connected to the ash outlet of the dust chamber 6 and an ash conveying device 17 connected to the bottom of the ash hopper 16. The top opening of the ash hopper 16 is connected to the ash outlet, so that the dust falls into the ash outlet and then enters the ash hopper 16, and is finally transferred by the ash conveying device 17.

[0066] In the above embodiments, the ash conveying device 17 can be a screw device, a pneumatic device, etc., and is not limited here.

[0067] In a preferred embodiment, the dust chamber 6 and the clean air chamber are both integrated into the same housing, and the dust chamber 6 and the clean air chamber are separated by a partition. In this way, the filter element 7, the pre-charge device 4, the guide plate 5, and the rapping device can all be integrated into the housing, facilitating modular manufacturing. All components are essentially pre-processed in the factory and transported to the site for assembly to form this modular desulfurization, denitrification, VOC removal, and dust removal integrated system, reducing the construction period by more than two-thirds compared to ordinary dust collectors. Steel columns 18 can be installed on the lower side of the housing to support it.

[0068] In practical applications, the single-layer modular desulfurization, denitrification, VOC removal and dust removal integrated system 20 can be used according to the working conditions and filtration area, or multiple modular desulfurization, denitrification, VOC removal and dust removal integrated systems can be stacked and connected together for use, saving space and improving production efficiency. Figure 3 The diagram shows the combined stacking of three modular desulfurization, denitrification, VOC removal, and dust removal systems.

[0069] A more specific embodiment is provided below. The modular desulfurization, denitrification, VOC removal, and dust removal integrated system includes a dust chamber 6, an air inlet duct, an air inlet box 3, a flow guiding device 31, a desulfurization catalyst injection device 30, a pre-charging device 4, a flow guiding plate 5, multiple filters 7, a VOC catalyst module 19, a left clean air chamber 10, a left metal frame, a left air outlet box 11, a left air outlet duct 12, a left rapping device, a right clean air chamber, a right metal frame, a right rapping device, a right air outlet box 14, a right air outlet duct 15, a denitrification catalyst module, an ash hopper 16, and an ash conveying device 17. The pre-charging device 4 and the flow guiding plate 5 are located within the dust chamber 6, with the pre-charging device 4 positioned above the flow guiding plate 5. The left and right metal frames are distributed horizontally within the dust chamber 6, and multiple filters 7 are installed within both the left and right metal frames. The left clean air chamber 10 is connected to the air outlet of the filters 7 within the left metal frame. The right air purification chamber 13 is connected to the air outlet of the filter element 7 inside the right metal frame. VOC catalyst modules 19 are installed in both the left air purification chamber 10 and the right air purification chamber 13.

[0070] In the modular desulfurization, denitrification, VOC removal, and dust removal integrated system described in the above embodiments, when treating flue gas, the dust-laden airflow sequentially enters the dust chamber 6 through the inlet duct and inlet box 3. The flue gas spirals downward through the reversing device in the inlet duct, and the desulfurization catalyst injection device 30 in the inlet duct atomizes and sprays out the desulfurizing agent. The flue gas reacts with the sprayed desulfurizing agent to achieve desulfurization. In the dust chamber 6, the flue gas sequentially passes through the pre-charge device 4 and the guide plate 5. Under the action of the pre-charge device 4, some fine dust condenses into large dust particles. After passing through the guide plate 5, the airflow direction changes, and some large dust particles accelerate and fall into the ash hopper 16 under the action of inertia. Part of the airflow entering the dust chamber 6 is filtered by the filter element 7 in the left metal frame and then enters the left clean air chamber 10, while the other part of the airflow is filtered by the filter element 7 in the right metal frame and then enters the right clean air chamber 13. The dust-laden airflow enters the interior through the surface of filter element 7, where dust is trapped. The flue gas reacts with the denitrification catalyst loaded on filter element 7 to achieve denitrification. The clean gas then enters the clean air chambers on both sides through the outlet of filter element 7. The gas in the clean air chambers on both sides reacts with the VOC catalyst module 19 to remove VOCs. Specifically, VOCs in the flue gas react with O2 to generate CO2 and H2O, achieving effective removal of VOCs from the high-temperature flue gas. Therefore, this modular integrated desulfurization, denitrification, VOC removal, and dust removal system adopts an top-inlet, side-outlet airflow design. The dust-laden airflow enters dust chamber 6 from the top, is filtered and purified by filter element 7, and then exits through the clean air chambers on both sides of dust chamber 6 and the outlet system. The direction of the inlet airflow is consistent with the direction of dust fall, which is conducive to the rapid downward settling of dust.

[0071] Both the left and right metal frames are equipped with rapping devices 9. The dust-laden airflow enters the clean air chamber after being filtered and purified by the filter element 7. Once the dust is trapped on the surface of the filter bag and reaches a certain pressure value, the rapping device 9 is activated for vibration cleaning. The dust deposited on the surface of the filter element 7 is vibrated and falls into the ash hopper 16, then is discharged from the dust collector via the ash conveying device 17. After cleaning, the filter element 7 is regenerated and resumes low-resistance operation. The gas purified by the filter element 7 enters the clean air chambers on the left and right sides respectively. The clean air chambers are equipped with catalyst modules that can remove nitrogen oxides from the flue gas, thus achieving synergistic treatment of dust and nitrogen oxides. The purified gas is discharged from the dust collector through the air outlet and air duct. The airflow on both sides can be controlled as needed. During installation and maintenance, the clean air chambers on both sides can be opened for easy installation and maintenance of the filter element 7.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A modular desulfurization, denitrification, VOC removal and dust removal integrated system, characterized in that, include: Dust chamber (6), the top of the dust chamber (6) is provided with at least one air inlet, and the bottom of the dust chamber (6) is provided with at least one dust outlet; An air inlet duct, the air outlet of which is connected to the air inlet of the dust chamber (6), the air inlet duct includes an air inlet pipe (2) connected in sequence and an air inlet box (3) connected to the air outlet of the air inlet pipe (2), the ventilation cross section of the air inlet box (3) gradually increases along the direction close to the dust chamber (6); The desulfurization catalyst injection device (30) is installed in the air inlet duct. Multiple filter elements (7) loaded with denitrification catalyst are disposed inside the dust chamber (6), and there is a gap between two adjacent filter elements (7). The filter elements are provided with denitrification catalyst inside and / or on the surface. At least one clean air chamber is provided on one side of the dust chamber (6), and the airflow in the dust chamber (6) flows through the filter element (7) and then enters the clean air chamber; An air outlet duct, wherein the air inlet of the air outlet duct is connected to the air outlet of the clean air chamber; The flow guiding device (31) is installed in the air inlet pipe. The flow guiding device (31) is located upstream of the desulfurization catalyst injection device (30), and the flow guiding device (31) guides the airflow to spiral down. Both the flow guiding device (31) and the desulfurization catalyst injection device (30) are installed in the air inlet pipe (2). VOC catalyst module (19), which is disposed in the clean air chamber.

2. The modular desulfurization, denitrification, and VOC removal integrated system of claim 1, wherein, It also includes a pre-charging device (4) disposed upstream of the plurality of filters (7).

3. The modular desulfurization, denitrification, and VOC removal integrated system of claim 1, wherein, It also includes a plurality of guide plates (5) disposed in the dust chamber (6), the guide plates (5) being inclined relative to the side wall of the dust chamber (6).

4. The modular desulfurization, denitrification, and VOC removal integrated system of claim 1, wherein, The filter element is a filter bag, and a denitrification catalyst module is installed inside the filter bag.

5. The modular desulfurization, denitrification, and VOC removal integrated system of claim 1, wherein, The air outlet duct includes an air outlet pipe and an air outlet box connected in sequence to the air inlet end of the air outlet pipe; Both the air inlet box (3) and the air outlet box are horn-shaped, and the ventilation cross section of the air outlet box gradually increases along the direction close to the clean air chamber.

6. The modular desulfurization, denitrification, and VOC removal integrated system of claim 1, wherein, The number of clean air chambers is two, and the two clean air chambers are respectively arranged on opposite sides of the dust chamber (6).

7. The modular integrated desulfurization, denitrification, VOC removal, and dust removal system according to claim 1, characterized in that, It also includes a dust hopper (16) connected to the dust outlet of the dust chamber (6) and a dust conveying device (17) connected to the bottom of the dust hopper (16).

8. The modular integrated desulfurization, denitrification, VOC removal, and dust removal system according to any one of claims 1-7, characterized in that, The dust chamber (6) and the clean air chamber are integrated into the same box, and the dust chamber (6) and the clean air chamber are separated by a partition.

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