Flue gas purification device for biomass fuel boiler

Abstract

The utility model discloses a biomass fuel boiler flue gas purification device which comprises a dust removal box, and the side face of the dust removal box is connected with a spray tower through an exhaust pipe. A plurality of layers of filter cartridges are arranged in the dust removal box, the filter cartridges are coaxially arranged, ash discharge ports are formed in the bottoms of the filter cartridges, and the ash discharge ports of the filter cartridges are fixed through connecting rods; compared with the prior art, the biomass fuel boiler flue gas dust removal device has the advantages that due to the fact that the multiple layers of coaxial filter cartridges with the gradually-decreased sizes are arranged, dust in biomass fuel boiler flue gas can be filtered in a multi-layer mode and efficiently removed; the filter cartridges are arranged in a nesting doll form, so that the flue gas can be filtered layer by layer after entering, and the dust removal effect is effectively improved. Meanwhile, by arranging the rotary driving device, the filter cartridge can rotate, so that dust is prevented from being locally accumulated on the inner wall of the filter cartridge, and the uniformity and continuity of the filtering effect are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue gas purification, in particular to a flue gas purification device for a biomass fuel boiler. Background Art

[0002] As an important device for biomass energy utilization, the flue gas treatment during the combustion process of a biomass fuel boiler has become an issue that cannot be ignored. The flue gas not only contains a large amount of particulate matter but may also contain harmful components such as sulfur dioxide, volatile organic compounds (VOCs), and polycyclic aromatic hydrocarbons (PAHs). If these pollutants are directly discharged into the atmosphere without effective treatment, they will cause serious pollution to the environment and affect human health.

[0003] After retrieval, the Chinese utility model with the application number 202021367727.0 discloses a flue gas purification device for a biomass fuel boiler. By setting up a purification chamber and configuring multiple filter plates inside it, effective interception and removal of particulate suspensions in the flue gas are achieved. Although this design can effectively filter out most of the particulate impurities in the flue gas, some significant problems have also emerged in practical applications.

[0004] For example, after long-term operation, the filter plates will inevitably accumulate a large amount of particulate impurities, resulting in clogging. Once the filter plates are clogged, it will not only further exacerbate the obstruction of flue gas flow but may also affect the purification effect and even cause damage to the equipment itself. And the current solutions often require manual intervention to disassemble, clean, or replace the clogged filter plates. This process is not only cumbersome and time-consuming, increasing the operation and maintenance costs, but may also cause equipment damage or safety hazards due to improper operation.

[0005] Therefore, how to simplify the maintenance and cleaning process of the filter plates while ensuring efficient filtration of particulate impurities in the flue gas has become an urgent technical problem in the current flue gas purification technology field. Summary of the Utility Model

[0006] In view of the above situation, to overcome the defects of the prior art, the utility model provides a flue gas purification device for a biomass fuel boiler to solve the above problems.

[0007] To achieve the above purpose, a flue gas purification device for a biomass fuel boiler of the utility model includes a dust removal box, and the side of the dust removal box is connected to a spray tower through an exhaust pipe;

[0008] A number of filter cylinders are arranged inside the dust removal box. The number of filter cylinders is coaxially arranged and there is an ash discharge port at the bottom. The ash discharge ports of the filter cylinders are fixed through a connecting rod;

[0009] A connecting pipe is fixed to the dust removal box, and several layers of the filter cylinders are rotatably sleeved on the connecting pipe. A rotation driving device for driving the filter cylinders to rotate is arranged on the connecting pipe;

[0010] The connecting pipe is plugged and fixed with a flue gas inlet pipe, and the lower end of the flue gas inlet pipe is plugged into the innermost layer of the filter cylinder;

[0011] Several brush plates are fixed to the side surface of the connecting pipe through several fixing rods. One brush plate corresponds to the inner wall of each layer of the filter cylinder, and each brush plate is in sliding connection with the inner wall of the corresponding filter cylinder.

[0012] Preferably, a bearing is fixed to the inner wall of the dust removal box, and the outermost layer of the filter cylinder is rotatably connected to the inner wall of the dust removal box through the bearing.

[0013] Preferably, the rotation driving device includes a motor fixed to the connecting pipe, a gear fixed to the output shaft of the motor, and a gear ring fixed to the upper end of the outermost layer of the filter cylinder. The gear is meshed with the gear ring.

[0014] Preferably, a first electric valve is installed at the lower end of the outermost layer of the filter cylinder.

[0015] Preferably, a conical discharging hopper is arranged at the bottom of the dust removal box, and the conical discharging hopper is connected with a second electric valve.

[0016] Preferably, a spray head and an activated carbon adsorption mechanism are installed inside the spray tower, and the activated carbon adsorption mechanism is arranged above the spray head.

[0017] Preferably, the activated carbon adsorption mechanism includes a drawer-type placement box installed at the upper end of the spray tower and activated carbon particles placed in the drawer-type placement box.

[0018] Preferably, guide rails are fixedly arranged on the inner wall of the filter cylinder, and guide blocks slidably matched with the guide rails are fixed to the brush plates.

[0019] The utility model has the following advantages compared with the prior art:

[0020] 1) Through the arrangement of multiple layers of coaxially arranged and gradually decreasing filter cylinders, the utility model realizes multi-layer filtration and efficient removal of dust in the flue gas of the biomass fuel boiler. These filter cylinders are arranged in a "matryoshka" form, enabling the flue gas to be filtered layer by layer after entering, effectively improving the dust removal effect. At the same time, the setting of the rotation driving device enables the filter cylinders to rotate, thus avoiding local accumulation of dust on the inner wall of the filter cylinders and ensuring the uniformity and continuity of the filtering effect.

[0021] 2) In addition, through the design of the brush plate on the side of the connecting pipe of the present utility model, during the rotation of the filter cartridge, the brush plate can automatically clean the inner wall of the filter cartridge, further improving the dust removal efficiency and extending the service life of the filter cartridge.

[0022] 3) Moreover, in terms of flue gas purification, the present utility model realizes the desulfurization treatment of harmful gases such as sulfur dioxide in the flue gas through the coordinated operation of the spray heads and the activated carbon adsorption mechanism in the spray tower, and removes pollutants such as volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs) through the adsorption of activated carbon particles, ensuring the up-to-standard discharge of the discharged gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0024] Figure 1 is a schematic cross-sectional structure diagram of the present utility model.

[0025] Figure 2 is the present utility model Figure 1 is an enlarged schematic structure diagram at position A in the present utility model.

[0026] Figure 3 is a schematic dust removal cross-sectional structure diagram of the present utility model.

[0027] Figure 4 is a schematic three-dimensional structure diagram of the present utility model.

[0028] In the figure: 10, dust removal box; 11, bearing; 12, conical hopper; 13, second electric valve; 20, exhaust pipe; 30, spray tower; 40, filter cartridge; 41, ash discharge port; 42, rotation drive device; 421, motor; 422, gear; 423, gear ring; 43, connecting rod; 44, first electric valve; 50, connecting pipe; 60, flue gas inlet pipe; 70, fixed rod; 71, brush plate; 80, spray head; 90, activated carbon adsorption mechanism; 91, drawer-type placement box. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following further elaborates in detail on the specific embodiments of the present utility model in conjunction with the attached Figures 1-4 drawings.

[0030] As Figures 1-4As shown in the figure, a flue gas purification device for a biomass fuel boiler of the present utility model includes a dust removal box 10. The side of the dust removal box 10 is connected to a spray tower 30 through an exhaust pipe 20. The dust removal box 10 is connected to the smoke exhaust port of the biomass boiler, and its function is to remove the dust generated during the combustion of the fuel in the biomass boiler. The flue gas after dust removal then enters the interior of the spray tower 30 through the exhaust pipe 20 and is discharged after desulfurization treatment.

[0031] In order to achieve multi-layer filtration of the dust in the combustion gas, several layers of filter cylinders 40 are provided inside the dust removal box 10. The several layers of filter cylinders 40 are coaxially arranged and there is an ash discharge port 41 at the bottom. The ash discharge ports 41 of several filter cylinders 40 are fixed through a connecting rod 43, so as to fix multiple filter cylinders 40 into a whole. It can be understood that the filter cylinders 40 have the same shape but different sizes, and are sleeved together one by one in the form of "Russian nesting dolls". In this way, when the dust enters the innermost filter cylinder 40, it will be filtered through each layer of filter cylinder 40 one by one, so as to achieve the effect of multi-layer filtration.

[0032] A connecting pipe 50 is fixed to the dust removal box 10. Several layers of filter cylinders 40 are rotatably sleeved on the connecting pipe 50. A rotation driving device 42 for driving the filter cylinder 40 to rotate is provided on the connecting pipe 50. The rotation driving device 42 is used to drive the filter cylinder 40 to rotate. It can be understood that although the dust can be discharged from all directions on the side of the filter cylinder 40 after entering the filter cylinder 40, the main flow direction is still on the side close to the exhaust pipe 20, which will cause the filter openings on the side of the filter cylinder 40 close to the exhaust pipe 20 to be more likely to accumulate dust. Through the setting of the rotation driving device 42, the position where the filter cylinder 40 mainly contacts the dust can be adjusted by rotating the filter cylinder 40. In this way, it is possible to prevent the dust from concentrating at a certain position of the filter cylinder 40;

[0033] Specifically, a flue gas inlet pipe 60 is inserted and fixed to the connecting pipe 50. The flue gas inlet pipe 60 is connected to the smoke exhaust port of the biomass boiler. The lower end of the flue gas inlet pipe 60 is inserted into the innermost filter cylinder 40 to directly introduce the flue gas into the innermost filter cylinder 40.

[0034] Furthermore, in order to facilitate the cleaning of the filter cylinder 40 and enable the filter cylinder 40 to work for a longer time, several brush plates 71 are fixed to the side of the connecting pipe 50 through several fixing rods 70. There is a brush plate 71 corresponding to the inner wall of each layer of filter cylinder 40, and each brush plate 71 is in sliding connection with the inner wall of the corresponding filter cylinder 40. Specifically, a guide rail 45 is fixed to the inner wall of the filter cylinder 40, and a guide block 72 that is slidably matched with the guide rail 45 is fixed to the brush plate 71.

[0035] It can be understood that the connecting pipe 50 is fixedly connected to the dust removal box 10, and the rotary drive device 42 drives the filter cartridge 40 to rotate. This causes the brush plate 71 to rotate relative to the filter cartridge 40. During the rotation process, the inner wall of the filter cartridge 40 is cleaned to prevent the vegetation during combustion from adhering to the inner wall of the filter cartridge 40 and affecting the flow of flue gas. Moreover, when the brush plate 71 rotates relative to the filter cartridge 40, the guide block 72 slides within the guide rail 45, maintaining the stability of the brush plate 71.

[0036] In some embodiments, a bearing 11 is fixed to the inner wall of the dust removal box 10, and the outermost filter cartridge 40 is rotatably connected to the inner wall of the dust removal box 10 through the bearing 11.

[0037] The following is a specific embodiment of the rotary drive device 42:

[0038] Please refer to Figure 2 , the rotary drive device 42 includes a motor 421 fixed to the connecting pipe 50, a gear 422 fixed to the output shaft of the motor 421, and a gear ring 423 fixed to the upper end of the outermost filter cartridge 40. The gear 422 is meshed with the gear ring 423. When in use, the motor 421 drives the gear 422 to rotate, the gear 422 drives the gear ring 423 to rotate, the gear ring 423 drives the outermost filter cartridge 40 to rotate, and when the outermost filter cartridge 40 rotates, it drives the inner filter cartridge 40 to rotate together through the connecting rod 43 at the ash discharge port 41.

[0039] In some embodiments, a first electric valve 44 is installed at the lower end of the outermost filter cartridge 40 for discharging ash when opened.

[0040] A conical discharge hopper 12 is provided at the bottom of the dust removal box 10, and the conical discharge hopper 12 is connected to a second electric valve 13.

[0041] In some embodiments, a spray head 80 and an activated carbon adsorption mechanism 90 are installed inside the spray tower 30. The spray head 80 sprays a sulfur dioxide absorbent inside the spray tower 30 to perform desulfurization treatment on the flue gas entering the spray tower 30. The activated carbon adsorption mechanism 90 is arranged above the spray head 80, and the desulfurized flue gas passes through the activated carbon adsorption mechanism 90 to adsorb pollutants such as volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), etc.

[0042] In some embodiments, the activated carbon adsorption mechanism 90 includes a drawer-type placement box 91 installed at the upper end of the spray tower 30 and activated carbon particles placed inside the drawer-type placement box 91.

[0043] In summary, for the flue gas purification device of the biomass fuel boiler of the present utility model, multiple layers of coaxial and decreasing-sized filter cylinders 40 are arranged in the dust removal box 10 to form a "matryoshka"-type filtering structure, enabling the flue gas to be filtered layer by layer after entering the filter cylinder 40. By cooperating with the rotary drive device 42 to rotate the filter cylinder 40, the position where the filter cylinder 40 mainly contacts the dust can be adjusted, thereby preventing the dust from concentrating in a certain area on the inner wall of the filter cylinder 40. In addition, the brush plate 71 fixed to the side of the connecting pipe 50 can move relative to the rotation of the filter cylinder 40 to automatically clean the inner wall of the filter cylinder 40, extending the service life of the filter cylinder 40. The dust-removed flue gas passes through the spray tower 30 and is further treated by the spray desulfurization and activated carbon adsorption mechanism 90 to remove pollutants such as sulfur dioxide and volatile organic compounds, finally achieving the comprehensive purification and up-to-standard discharge of the flue gas.

[0044] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A flue gas purification device for a biomass fuel boiler, characterized in that, It includes a dust removal box (10), and the side of the dust removal box (10) is connected to a spray tower (30) through an exhaust pipe (20); Inside the dust removal box (10), there are several layers of filter cartridges (40). The several layers of filter cartridges (40) are coaxially arranged and there is an ash discharge port (41) at the bottom. The ash discharge ports (41) of the filter cartridges (40) are fixed through a connecting rod (43); A connecting pipe (50) is fixed to the dust removal box (10). The several layers of filter cartridges (40) are rotatably sleeved on the connecting pipe (50), and a rotation driving device (42) for driving the filter cartridges (40) to rotate is provided on the connecting pipe (50); The connecting pipe (50) is inserted and fixed with a flue gas inlet pipe (60), and the lower end of the flue gas inlet pipe (60) is inserted into the innermost layer of the filter cartridge (40); Several brush plates (71) are fixed to the side of the connecting pipe (50) through several fixing rods (70). There is a corresponding brush plate (71) on the inner wall of each layer of the filter cartridge (40), and each brush plate (71) is in sliding connection with the inner wall of the corresponding filter cartridge (40).

2. The flue gas purification device for a biomass fuel boiler according to claim 1, wherein, A bearing (11) is fixed to the inner wall of the dust removal box (10). The outermost layer of the filter cartridge (40) is rotatably connected to the inner wall of the dust removal box (10) through the bearing (11).

3. The flue gas purification device for a biomass fuel boiler according to claim 1, characterized in that, The rotation driving device (42) includes a motor (421) fixed to the connecting pipe (50), a gear (422) fixed to the output shaft of the motor (421), and a gear ring (423) fixed to the upper end of the outermost layer of the filter cartridge (40). The gear (422) is meshed with the gear ring (423).

4. A flue gas purification device for a biomass fuel boiler according to claim 1, characterized in that, A first electric valve (44) is installed at the lower end of the outermost layer of the filter cartridge (40).

5. A flue gas purification device for a biomass fuel boiler according to claim 4, characterized in that, A conical discharge hopper (12) is provided at the bottom of the dust removal box (10), and the conical discharge hopper (12) is connected with a second electric valve (13).

6. The flue gas purification device for a biomass fuel boiler according to claim 1, wherein, A spray head (80) and an activated carbon adsorption mechanism (90) are installed inside the spray tower (30), and the activated carbon adsorption mechanism (90) is arranged above the spray head (80).

7. A flue gas purification device for a biomass fuel boiler according to claim 6, characterized in that, The activated carbon adsorption mechanism (90) includes a drawer-type placement box (91) installed at the upper end of the spray tower (30) and activated carbon particles placed in the drawer-type placement box (91).

8. A flue gas purification device for a biomass fuel boiler according to claim 1, characterized in that, Guide rails (45) are fixedly provided on the inner wall of the filter cartridge (40), and guide blocks (72) slidably matched with the guide rails (45) are fixed to the brush plates (71).

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