Multi-stage wet dust removal process

Abstract

The invention discloses a multi-stage wet dust removal process. In the field of particleboard production, a space for spraying water mist and water splash is formed below the spray pipe system. After the tail smoke is discharged into the dust removal tower through the smoke inlet, the tail smoke upwardly offsets the water mist and / or the water splash. The water-mixed dust particles settle based on their own weight and / or are knocked down by the water splash. The space filled with water mist and water splash simultaneously improves the water mixing rate and sedimentation rate of the dust particles. Then, electrostatic dust removal is performed in the mist-filled space. The dust particles in the moist dust space are quickly and fully electrified, further improving the dust removal rate. The upward direction of the exhaust gas after electrostatic dust removal intersects with the airflow direction of multiple horizontal air pipes. The airflow of the horizontal air pipes is suitable for heat exchange with the exhaust gas. The exhaust gas is condensed and dusted before being discharged. The dust removal rate is improved while avoiding the derivation of mist flow from the top exhaust chimney.

Description

Technical Field

[0001] The invention relates to particleboard production, and in particular to a multi-stage wet dust removal process. Background Art

[0002] The production process of particleboard includes wood shavings, shavings drying, particleboard glue, shavings spreading and pressing into boards. The heat source used in the shavings drying process is generally hot smoke directly derived from the fuel (appropriately adjusted into room temperature air), so that the shavings are wrapped in hot smoke and stuffy during rolling forward, and the water vapor emitted by the shavings is easy to be blown away together with the hot smoke and shavings. Therefore, hot smoke mixing drying is more ideal.

[0003] However, this method requires more hot smoke; even the exhaust gas after the wood chips are dried further increases the dust content, and panel companies are in urgent need of effectively treating the exhaust gas. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems mentioned above and provide a multi-stage wet dust removal process, so that the exhaust gas undergoes multiple purifications to fully filter out the dust particles in the exhaust gas, first spraying and then electrostatic dust removal and condensation dust reduction, so as to synergistically improve the dust removal rate.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A multi-stage wet dust removal process comprises the following steps:

[0007] Spray dust removal: a space for spraying water mist and water splash is formed below the spray pipe system. After the tail smoke is discharged into the dust removal tower through the smoke inlet, the tail smoke will hit the water mist and / or water splash upward, and the dust particles mixed with water will settle due to their own weight and / or be knocked down by the water splash.

[0008] Electrostatic dust removal: dust particles in the wet exhaust gas after spray dust removal are suitable for being charged to be adsorbed to the anode plate;

[0009] Condensation dust reduction: the upward direction of the exhaust gas after electrostatic dust removal intersects with the airflow direction of multiple horizontal air pipes. The airflow of the horizontal air pipes is suitable for heat exchange with the exhaust gas. The water vapor in the exhaust gas is condensed through heat exchange, and the dust particles carried by the water vapor settle with the condensed water liquid.

[0010] Among them, an air equalizing mesh plate is arranged above the smoke inlet, and a layer of granular material is contained in the dust removal tower. The layer of granular material is suitable for covering the sewage discharge port, so that when the sewage discharge port of the dust removal tower is continuously emptied, a tail smoke dispersion and homogenization space is formed under the air equalizing mesh plate, and the layer of granular material is simultaneously suitable for filtering sewage. In the spray dust removal step, the air equalizing mesh plate is suitable for allowing the tail smoke to diverge and be homogenized and then flow up to the water mist and splash space below the spray dust removal pipe system.

[0011] Compared with the prior art, the beneficial effects of the present application include: the tail smoke undergoes multiple dust removal processes to effectively remove most of the dust particles; specifically, the space filled with water mist and water splashes simultaneously improves the dust particle mixing rate and sedimentation rate, first atomizing and sprinkling to remove large dust particles and most of the dust particles, and then electrostatic dust removal is performed in the mist-filled space, and the dust particles in the moist dust space are quickly and fully electrified, further improving the dust removal rate; condensation and dust reduction are performed before the exhaust gas is discharged, which improves the dust removal rate while avoiding the generation of fog flow from the top exhaust chimney.

[0012] As an improvement of the above technical solution, an inclined platform is arranged in the dust removal tower, the sewage discharge port is located on one side of the inclined platform and corresponds to the lower end of the inclined platform, the dust removal tower is provided with a particulate material supply port corresponding to the high end of the inclined platform and a particulate material discharge port corresponding to the lower end of the inclined platform, the particulate material supply port and the particulate material discharge port are encapsulated with a cover plate, and the particulate material discharge port is also suitable for brushing the inclined platform.

[0013] As an improvement on the above technical solution, after the spray dust removal step, the dust is first demisted and filtered, and then mist is regenerated to overflow the gaps between the plates of the electrostatic dust removal plate system. The demisting and dust filter plates are suitable for filtering out the mist and moist dust particles floating upward from the spray dust removal pipe system, and then the spray mist generating pipe system is suitable for forming a space for sprinkling water mist thereunder, so that mist is overflowed from the gaps between the plates of the electrostatic dust removal plate system.

[0014] As an improvement of the above technical solution, a first liquid collecting hopper is arranged between the demisting dust filter plate and the re-spraying mist pipe system. A pair of side walls of the first liquid collecting hopper are suitable for vertical plates or inclined plates, and the other pair of side walls are both stepped structures. The adjacent steps of the stepped structure are distributed at intervals and partially overlapped in the upper and lower directions. A collecting trough is arranged at the cone tip of the first liquid collecting hopper. The first liquid collecting hopper is suitable for collecting water mist sprinkled by the re-spraying mist pipe system, and the water cloth falling from the steps is suitable for preventing the water mist from passing over the first liquid collecting hopper.

[0015] As an improvement of the above technical solution, a first maintenance window is provided on the right wall of the dust removal tower, and the lower edge of the first maintenance window corresponds to the air equalizing mesh plate. The height difference between the air equalizing mesh plate and the spray dust removal pipe system is ≥1.1m. When the dust removal tower is cleaned, the air equalizing mesh plate is suitable as a maintenance platform, and the first maintenance window is suitable for maintenance personnel to enter and exit. The front end of the spray dust removal pipe system is suitable for connecting to the built-in water supply flange of the dust removal tower. The spray dust removal pipe system and the air equalizing mesh plate are supported by the built-in crossbeams of the dust removal tower at both ends. The first maintenance window is also suitable for disassembling and assembling the air equalizing mesh plate and the spray dust removal pipe system.

[0016] As an improvement of the above technical solution, a second maintenance window is provided on the right wall of the dust removal tower, and the lower edge of the second maintenance window corresponds to the bottom of the electrostatic dust removal plate system. The height difference of the second maintenance window is ≥1.5m. The electrostatic dust removal plate system and the first liquid collecting bucket are both built-in beams supported by the dust removal tower at the front and rear ends. The second maintenance window is suitable for disassembling and assembling the electrostatic dust removal plate system and the first liquid collecting bucket.

[0017] As an improvement of the above technical solution, in the electrostatic dust removal step, the electrostatic dust removal plates are intermittently powered on for dust removal and spray washing, and when the spray flushing pipe system above the electrostatic dust removal plates sprays liquid to the electrostatic dust removal plates, the electrostatic dust removal plates suspend dust removal.

[0018] As an improvement of the above technical solution, a second liquid collecting hopper is arranged below the horizontal air pipe, a pair of side walls of the second liquid collecting hopper are suitable for vertical plates or inclined plates, and the other pair of side walls are both stepped structures, the adjacent steps of the stepped structure are spaced apart and partially overlapped in the upper and lower directions, and a collecting trough is arranged at the cone tip of the second liquid collecting hopper, and the second liquid collecting hopper is suitable for collecting condensate dripping from the horizontal air pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 It is a schematic structural diagram of a multi-stage wet dust removal device according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A cross-sectional view showing a multi-stage wet dust removal device;

[0022] Figure 3 for Figure 1 An exploded view of a multi-stage wet dust removal device is shown;

[0023] Figure 4 A schematic diagram of a multi-stage wet dust removal device according to an embodiment of the present invention;

[0024] Figure 5 for Figure 3 A schematic diagram showing the structure of a spray dust removal piping system, a re-spray mist generation piping system or a spray flushing piping system of a multi-stage wet dust removal device;

[0025] Figure 6 for Figure 3 A schematic diagram showing the structure of a first liquid collecting hopper or a second liquid collecting hopper of a multi-stage wet dust removal device;

[0026] Figure 7 for Figure 3 An exploded view showing the electrostatic dust removal plate system of the multi-stage wet dust removal device with the outer frame hidden;

[0027] Figure 8 for Figure 2 Another three-dimensional structural diagram of the mixed flow mist condensing pipe system of the multi-stage wet dust removal device is shown;

[0028] Fig. 9 This is another exemplary schematic diagram of the mixed flow mist condensation pipe system of the multi-stage wet dust removal device according to an embodiment of the present invention.

[0029] The accompanying drawings are only one specific embodiment of the present invention, and the form and structure of this specific embodiment should not limit the expansion of other embodiments.

[0030] Dust removal tower 100, tower body 110, smoke inlet 111, sewage outlet 112, particulate material supply port 113, particulate material outlet 114, first maintenance window 115, second maintenance window 116, top cover 120, top exhaust chimney 130, inclined platform 140;

[0031] Gas mesh plate 200;

[0032] Spray dust removal pipe system 300;

[0033] Demisting dust filter plate 400;

[0034] A spray mist pipe system 510 and a first liquid collecting hopper 520;

[0035] Electrostatic dust removal plate system 610, outer frame 611, cathode plate 612, anode plate 613, spray flushing pipe system 620;

[0036] Mixed flow condensing pipe system 700, horizontal air pipe 710, end tube 720, exhaust fan 730, suction hood 740, thrust end cover 750, vertical pipe 760, mounting block 770;

[0037] The second set of liquid bucket 800. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Reference Figures 1 to 4 The present invention provides a multi-stage wet dust removal device, including a dust removal tower 100, wherein the dust removal tower 100 is sequentially provided with a spray dust removal pipe system 300, an electrostatic dust removal plate system 610 and a mixed flow condensation pipe system 700 from bottom to top, so that the inner chamber of the dust removal tower 100 is divided into a plurality of chambers arranged in the up-and-down direction; the dust removal tower 100 is provided with a smoke inlet 111 located below the spray dust removal pipe system 300, and the tail smoke discharged into the dust removal tower 100 can sequentially undergo the spray dust removal of the spray dust removal pipe system 300, the electrostatic dust removal of the electrostatic dust removal plate system 610 and the condensation dust reduction of the mixed flow condensation pipe system 700; the dust removal tower 100 is provided with a top exhaust chimney 130, and the lower end of the dust removal tower 100 is provided with a sewage discharge port 112 lower than the smoke inlet 111.

[0040] Reference Figures 1 to 4, a multi-stage wet dust removal process, including a spray dust removal step, an electrostatic dust removal step and a condensation dust reduction step.

[0041] Reference Figure 2 , Figure 3 and Figure 5 The spray dust removal pipe system 300 includes a plurality of horizontal water pipes and a plurality of nozzles connected to the horizontal water pipes. The horizontal water pipes are connected to the water tank through corresponding water pumps. In the spray dust removal step, a space for spraying water mist and water splashes can be formed below the spray dust removal pipe system 300. It can be understood that according to the requirements of water mist and water splashes, atomizing nozzles and sprinkler heads are configured; atomizing nozzles and sprinkler heads are conventional knowledge, such as commonly used nozzles for agricultural and forestry sprinkler irrigation and fire sprinkler heads.

[0042] The space below the sprinkler pipe is filled with water mist without dead corners. The tail smoke is directed upward against the water mist and / or against the water splash. The dust particles mixed with water settle based on their own weight and / or are knocked down by the water splash. Most of the dust particles in the tail smoke are initially filtered out by the water mist and water splash. 70%-85% of the dust particles in the tail smoke are mixed with water and settle, including 95%-98% of the large dust particles.

[0043] Reference Figure 7 The electrostatic dust removal plate system 610 includes a plurality of cathode plates 612 and a plurality of anode plates 613, and even includes an outer frame 611. The outer frame 611 can be made of insulating materials such as epoxy resin. The cathode plates 612 and the anode plates 613 are arranged alternately, and a narrow air passage filled with water mist and dust particles is formed between the anode plates 613 and the cathode plates 612, and the dust particles have been fully wetted in advance; the cathode plates 612 and the anode plates 613 are energized, so that 90%-95% of the dust particles in the narrow air passage are charged and adsorbed to the anode plates 613 (i.e., 14%-27% of the dust particles in the original tail smoke are filtered out). In the electrostatic dust removal step, the dust particles in the wet tail gas after spraying and dust removal are suitable for being fully and quickly charged to be adsorbed to the anode plates 613. Specifically, when the exhaust gas passes through the high-voltage electrostatic field, the air molecules in the strong electric field (i.e., in the narrow air channel) are ionized into positive ions and electrons. The electrons encounter dust particles when rushing to the anode plate 613, causing the dust particles to be negatively charged and adsorbed to the anode plate 613 for collection. The strong electric field (i.e., in the narrow air channel / between-plate gap) is a humid space. The electrons obtained by the separation of air molecules fully and quickly bond with the wet dust particles in the space filled with water mist and dust particles. The dust particles are more quickly adsorbed to the anode plate 613 due to their hygroscopicity and charge.

[0044] The existing conventional spray dust removal rate is about 70%-80%, and the conventional electrostatic dust removal rate is about 80%-90%, which is difficult to improve in the industry. The present invention is based on the water mist filling scene formed by the spray pipe system. It first sprays to remove large dust particles and most of the dust particles, and then removes the fully wet dust particles in the humid space by electrostatic. Compared with the conventional combination of spray dust removal and electrostatic dust removal, the dust removal rate is synergistically and substantially improved from the details of atomization settling and rising process to wet dust in advance and electrostatic details of the humid filling space.

[0045] Reference Figures 2 to 4 , Fig. 9 The mixed flow condensation pipe system 700 includes a plurality of transverse air pipes 710, an end tube 720 and an exhaust fan 730. The plurality of transverse air pipes 710 are accommodated in the dust removal tower 100, and one end is connected to the atmosphere outside one side of the dust removal tower 100, and the other end is connected to the exhaust fan 730 through the end tube 720, so that the normal temperature air outside the dust removal tower 100 can pass through the transverse air pipe 710. The airflow direction of the plurality of transverse air pipes 710 is suitable for intersecting with the upward direction of the exhaust gas, and the airflow of the transverse air pipe 710 is suitable for forming a mixed flow effect heat exchange with the exhaust gas.

[0046] Therefore, in the condensation and dust reduction step, the upward direction of the exhaust gas after electrostatic dust removal intersects with the airflow direction of the multiple horizontal air pipes 710. The airflow of the horizontal air pipes 710 is suitable for heat exchange with the exhaust gas. The water vapor in the exhaust gas is condensed through heat exchange, and the dust particles carried by the water vapor settle with the condensed water. The condensed water drips downward through the horizontal air pipes 710.

[0047] Compared with the prior art, the beneficial effects of the present application include: the tail smoke undergoes multiple dust removal processes to effectively remove most of the dust particles; specifically, the space filled with water mist and water splashes simultaneously improves the water mixing rate and sedimentation rate of the dust particles, first atomizing and sprinkling to remove large dust particles and most of the dust particles, and then electrostatic dust removal is performed in the mist-filled space, and the dust particles in the moist dust space are quickly and fully electrified, further improving the dust removal rate; condensation and dust reduction are performed before the exhaust gas is discharged, which improves the dust removal rate while avoiding the generation of fog flow from the top exhaust chimney 130.

[0048] In some embodiments of the present invention, an air equalizing mesh plate 200 is arranged above the smoke inlet 111. In the spray dust removal step, the air equalizing mesh plate 200 is suitable for allowing the tail smoke to be dispersed and homogenized and then flow up to the water mist and splash space below the spray dust removal pipe system 300, thereby preventing the tail smoke from rising only locally based on the smoke inlet 111, and the dust particles in the tail smoke are sprayed and settled more quickly and fully.

[0049] Reference Figures 2 to 4 In some embodiments of the present invention, a granular material layer is contained in the dust removal tower 100, and the granular material layer is suitable for covering the sewage discharge port 112, so that when the sewage discharge port 112 is continuously emptied, the inertial flow of sewage discharge is prevented from disturbing the homogenized upwelling of tail smoke, and a tail smoke dispersion and homogenization space is formed under the air homogenization mesh plate 200, and the homogenized tail smoke is sprayed and dusted in a larger plane; in addition, the granular material layer simultaneously performs coarse filtration on the sewage, such as wood residue and sawdust.

[0050] According to the size of the sewage outlet 112 and the particle size of the granular material, it is determined whether to use the partition net and the mesh size of the partition net to prevent the granular material from being discharged. The granular material can be quartz sand, activated carbon, etc.

[0051] Reference Figures 2 to 4 In some embodiments of the present invention, a ramp 140 is provided in the dust removal tower 100, and the sewage discharge port 112 is located on one side of the ramp 140 and corresponds to the lower end of the ramp 140. The dust removal tower 100 is provided with a particulate material supply port 113 corresponding to the upper end of the ramp 140 and a particulate material discharge port 114 corresponding to the lower end of the ramp 140. The particulate material supply port 113 and the particulate material discharge port 114 are encapsulated with a cover plate. The setting of the ramp 140 not only solves the problem of sufficient discharge of sewage, but also solves the problem of convenience in the supply, stacking and discharge of particulate materials in the large vertical tower of the dust removal tower 100. Opening the particulate material discharge port 114 can also better sweep the ramp 140. Better, the lower edge of the particulate material discharge port 114 corresponds to the lower end of the ramp 140, and the upper edge corresponds to the upper end of the ramp 140, so that the discharge of particulate materials is smoother and the cleaning of the ramp 140 is more convenient.

[0052] Reference Figures 1 to 3 In some embodiments of the present invention, a first maintenance window 115 is provided on the right wall of the dust removal tower 100, and the lower edge of the first maintenance window 115 corresponds to the air-evening mesh plate 200. The height difference between the air-evening mesh plate 200 and the spray dust removal pipe system 300 is ≥1.1m. The air-evening mesh plate 200 is also suitable as a maintenance platform. The first maintenance window 115 is suitable for maintenance personnel to enter and exit. The front end of the spray dust removal pipe system 300 is suitable for docking with the built-in water supply flange of the dust removal tower 100. The spray dust removal pipe system 300 and the air-evening mesh plate 200 are both supported by the built-in crossbeams of the dust removal tower 100 at both ends. The first maintenance window 115 is also suitable for disassembling and assembling the air-evening mesh plate 200 and the spray dust removal pipe system 300. In the configuration of the present invention, the thickness / height of the spray dust removal pipe system 300 and the air distribution mesh plate 200 is relatively small. Combined with the design of the corresponding aforementioned built-in crossbeam, the spray dust removal pipe system 300 and the air distribution mesh plate 200 are both tilted at the front or rear end, and can be moved to the first maintenance window 115, and then enter and exit the first maintenance window 115. A single first maintenance window 115 can be replaced to maintain the spray dust removal pipe system 300 and the air distribution mesh plate 200, etc., reducing the number of maintenance windows. It is understandable that the first maintenance window 115 is encapsulated with a corresponding cover plate.

[0053] Reference Figures 1 to 4 In some embodiments of the present invention, the dust removal tower 100 is sequentially provided with a demisting dust filter plate 400 and a re-mist generating pipe system 510 from bottom to top, so that the space between the spray dust removal pipe system 300 and the electrostatic dust removal plate system 610 is divided into three sections. After the spray dust removal step, demisting and dust filtering are performed first, and then re-mist is generated to overflow the inter-plate gaps of the electrostatic dust removal plate system 610. The demisting dust filter plate 400 is suitable for filtering out the mist and wet dust particles floating upward from the spray dust removal pipe system 300, and the re-mist generating pipe system 510 is suitable for forming a space for spraying water mist thereunder, so that the inter-plate gaps of the electrostatic dust removal plate system 610 overflow the mist.

[0054] Reference Figure 2 , Figure 3 It can be understood that the re-spray mist pipe system 510 and the spray flushing pipe system 620 also include a plurality of horizontal water pipes and a plurality of nozzles connected to the horizontal water pipes.

[0055] The demisting dust filter plate 400 includes a filter element, which can be made of natural fiber, artificial fiber, activated carbon, etc. Preferably, the demisting dust filter plate 400 includes a mesh frame, which wraps the filter element.

[0056] Reference Figure 2 , Figure 3 In some embodiments of the present invention, the mist removal dust filter plate 400 is composed of a plurality of sub-plates spliced ​​side by side, and the front and rear ends of each sub-plate are supported by the built-in crossbeam of the dust removal tower 100. The first maintenance window 115 is also suitable for disassembling and assembling the sub-plates. After disassembling the spray dust removal pipe system 300 through the first maintenance window 115, the sub-plates can be disassembled and assembled.

[0057] Reference Figure 2 , Figure 3 and Figure 6 In some embodiments of the present invention, a first liquid collecting hopper 520 is arranged between the mist removing dust filter plate 400 and the re-spraying mist pipe system 510. A pair of side walls of the first liquid collecting hopper 520 are suitable for vertical plates or inclined plates, and the other pair of side walls are both stepped structures. The adjacent steps of the stepped structure are distributed at intervals and partially overlapped in the upper and lower directions. A collecting trough is arranged at the cone tip (i.e., the bottom) of the first liquid collecting hopper 520. The first liquid collecting hopper 520 is suitable for collecting the water mist sprinkled by the re-spraying mist pipe system 510, and the water cloth dropped by the steps is suitable for preventing the water mist from passing over the first liquid collecting hopper 520.

[0058] Reference Figure 2 , Figure 3 In some embodiments of the present invention, a second maintenance window 116 is provided on the right wall of the dust removal tower 100, the lower edge of the second maintenance window 116 corresponds to the bottom of the electrostatic precipitator plate system 610, the height difference of the second maintenance window 116 is ≥1.5m, the electrostatic precipitator plate system 610 and the first liquid collecting hopper 520 are both built-in crossbeams supported on the dust removal tower 100 at both ends, and the second maintenance window 116 is suitable for disassembling and assembling the electrostatic precipitator plate system 610 and the first liquid collecting hopper 520. In the present invention, the second maintenance window 116 corresponds to the electrostatic precipitator plate system 610, and the electrostatic precipitator plate system 610 can be disassembled and assembled through the second maintenance window 116 in a drawer-like manner. The first liquid collecting hopper 520 itself is bucket-shaped, and its front and rear ends are combined to be the hanging ends, and the second maintenance window 116 is set on the left / right side, and when the first liquid collecting hopper 520 is tipped over, it occupies a small space and is then detached from the second maintenance window 116.

[0059] Reference Figures 2 to 4In some embodiments of the present invention, a spray flushing pipe system 620 is provided above the electrostatic dust removal plate system 610, and the spray flushing pipe system 620 is suitable for spraying the electrostatic dust removal plate system 610 when the electrostatic dust removal plate system 610 is not powered on. The spray flushing pipe system 620 performs the spraying work, and its nozzle is preferably a water spray type. In the electrostatic dust removal step, the electrostatic dust removal plate system 610 is intermittently powered on for dust removal and spraying. When the spray flushing pipe system 620 above the electrostatic dust removal plate system 610 sprays liquid to the electrostatic dust removal plate system 610, the electrostatic dust removal plate system 610 stops dust removal.

[0060] In some configurations, the end tube 720 of the mixed flow condensing pipe system 700 does not exhaust air to the top exhaust chimney 130, and the horizontal air pipe 710 of the mixed flow condensing pipe system 700 inhales external air and directly discharges it back to the atmosphere. Figures 2 to 4 One end of multiple horizontal air pipes 710 is fixed to a mounting block 770, and the other end is fixed to an end tube 720. The mounting block 770 and the end tube 720 are respectively supported on two side walls (such as left and right side walls, front and back side walls) of the dust removal tower 100, and the end tube 720 is suitable for exhausting to the atmosphere.

[0061] Reference Figure 2 , Figure 3 and Figure 8 Preferably, the mixed flow condensing pipe system 700 further includes an air suction hood 740 , the exhaust fan 730 is disposed in the air suction hood 740 , and the air suction hood 740 is suitable for docking with the end tube 720 .

[0062] Reference Figures 2 to 4 , Figure 8 Better yet, the mixed flow condensing pipe system 700 also includes a thrust end cover 750, a mounting block 770 is screwed to the thrust end cover 750, an end tube 720 is integrally formed with a thrust flange, a plurality of transverse air pipes 710 are suitable for being inserted into the dust removal tower 100 together with the mounting block 770, and the thrust end cover 750 and the thrust flange are suitable for clamping the dust removal tower 100 together, so that the mixed flow condensing pipe system 700 is fixedly installed.

[0063] Reference Figures 2 to 4 In some embodiments of the present invention, a second liquid collecting hopper 800 is arranged below the mixed flow condensing pipe system 700, a pair of side walls of the second liquid collecting hopper 800 are suitable for vertical plates or inclined plates, and the other pair of side walls are both stepped structures, and the adjacent two steps of the stepped structure are distributed at intervals and partially overlapped in the upper and lower directions. A collecting trough is arranged at the cone tip (i.e., the bottom) of the second liquid collecting hopper 800, and the second liquid collecting hopper 800 is suitable for collecting condensate dripping from the horizontal air pipe 710.

[0064] Reference Figures 1 to 4Preferably, the dust removal tower 100 includes a tower body 110, a top cover 120 and an exhaust chimney 130 arranged on the top of the top cover 120. The top of the tower body 110 is open, the mixed flow condensation pipe system 700 is installed in a horizontal insertion manner, and the top of the tower body 110 is suitable for disassembling and assembling the second liquid collecting hopper 800.

[0065] The top cover 120 may reserve a platform for installing a high-voltage electric box, which is suitable for providing working power to the electrostatic precipitator panel system 610 .

[0066] Furthermore, the second liquid collecting hopper 800 and the spray flushing pipe system 620 are both supported by built-in cross beams of the dust removal tower 100 at both front and rear ends, and the open top of the tower body 110 is also suitable for disassembling and assembling the spray flushing pipe system 620.

[0067] In some configurations, the end tube 720 of the mixed flow mist condensing pipe system 700 exhausts air to the lower end of the top exhaust chimney 130, and the horizontal air pipe 710 of the mixed flow mist condensing pipe system 700 inhales external air, condenses the mist vapor in the dust removal tower 100, mixes with the condensed and dehumidified purified exhaust gas, and then discharges them together through the top exhaust chimney 130. For details, refer to Fig. 9 The mixed flow fog condensation pipe system 700 also includes a vertical pipe 760, the lower end of which is connected to the horizontal air pipe 710, and the other end is connected to the end tube 720. The exhaust fan 730 is arranged at the end tube 720, and the lower port of the top exhaust chimney 130 is arranged at a distance from the end tube 720. The end tube 720 is suitable for blowing air toward the top exhaust chimney 130. The exhaust gas rushes up to the outer wall of the horizontal air pipe 710, and continues to surge up after condensation and degassing (preliminary cooling), and then mixes with air and cools down in the top exhaust chimney 130. In this method, the cooling area of ​​the horizontal air pipe 710 is smaller than that of the aforementioned method. After condensing most of the water vapor in this method, the relatively low-temperature exhaust gas carries the remaining small amount of water vapor, and is discharged by mixing with air and cooling down, which is also not easy to generate fog flow.

[0068] In some arrangements, a negative pressure suction hole is provided at the upper end of the vertical tube 760 .

[0069] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A multi-stage wet dust removal process, characterized in that: The following steps are involved: Spray dust removal: a space for spraying water mist and water splash is formed below the spray pipe system. After the tail smoke is discharged into the dust removal tower through the smoke inlet, the tail smoke will hit the water mist and / or water splash upward, and the dust particles mixed with water will settle due to their own weight and / or be knocked down by the water splash. Electrostatic dust removal: dust particles in the wet exhaust gas after spray dust removal are suitable for being charged to be adsorbed to the anode plate; Condensation dust reduction: the upward direction of the exhaust gas after electrostatic dust removal intersects with the airflow direction of multiple horizontal air pipes. The airflow of the horizontal air pipes is suitable for heat exchange with the exhaust gas. The water vapor in the exhaust gas is condensed through heat exchange, and the dust particles carried by the water vapor settle with the condensed water liquid. Among them, an air equalizing mesh plate is arranged above the smoke inlet, and a layer of granular material is contained in the dust removal tower. The layer of granular material is suitable for covering the sewage discharge port, so that when the sewage discharge port of the dust removal tower is continuously emptied, a tail smoke dispersion and homogenization space is formed under the air equalizing mesh plate, and the layer of granular material is simultaneously suitable for filtering sewage. In the spray dust removal step, the air equalizing mesh plate is suitable for allowing the tail smoke to diverge and be homogenized and then flow up to the water mist and splash space below the spray dust removal pipe system.

2. The multi-stage wet dust removal process according to claim 1, characterized in that: An inclined platform is arranged in the dust removal tower, and a sewage discharge port is located on one side of the inclined platform and corresponds to the lower end of the inclined platform. The dust removal tower is provided with a particulate material supply port corresponding to the high end of the inclined platform and a particulate material discharge port corresponding to the lower end of the inclined platform. The particulate material supply port and the particulate material discharge port are encapsulated with a cover plate, and the particulate material discharge port is also suitable for brushing the inclined platform.

3. The multi-stage wet dust removal process according to claim 1, characterized in that: After the spray dust removal step, the mist is first removed and the dust is filtered, and then the mist is regenerated to overflow the gaps between the electrostatic dust removal plates. The mist removal and dust filter plates are suitable for filtering the mist and wet dust particles floating upward from the spray dust removal pipe system, and then the spray mist generation pipe system is suitable for forming a space for spraying water mist therebelow, so that the gaps between the electrostatic dust removal plates overflow the mist.

4. The multi-stage wet dust removal process according to claim 3, characterized in that: A first liquid collecting hopper is arranged between the demisting dust filter plate and the re-spraying mist pipe system. A pair of side walls of the first liquid collecting hopper are suitable for being vertical plates or inclined plates, and the other pair of side walls are both stepped structures. The adjacent steps of the stepped structure are distributed at intervals and partially overlapped in the upper and lower directions. A collecting trough is arranged at the cone tip of the first liquid collecting hopper. The first liquid collecting hopper is suitable for collecting water mist sprinkled by the re-spraying mist pipe system, and the water cloth dropped from the steps is suitable for preventing the water mist from passing over the first liquid collecting hopper.

5. The multi-stage wet dust removal process according to claim 3, characterized in that: A first maintenance window is provided on the right wall of the dust removal tower, and the lower edge of the first maintenance window corresponds to the air equalizing mesh plate. The height difference between the air equalizing mesh plate and the spray dust removal pipe system is ≥1.1m. When the dust removal tower is cleaned, the air equalizing mesh plate serves as a maintenance platform. The first maintenance window is suitable for maintenance personnel to enter and exit. The front end of the spray dust removal pipe system is suitable for connecting to the built-in water supply flange of the dust removal tower. The spray dust removal pipe system and the air equalizing mesh plate are supported by the built-in crossbeams of the dust removal tower at both ends. The first maintenance window is also suitable for disassembling and assembling the air equalizing mesh plate and the spray dust removal pipe system.

6. The multi-stage wet dust removal process according to claim 4, characterized in that: A second maintenance window is provided on the right wall of the dust removal tower, and the lower edge of the second maintenance window corresponds to the bottom of the electrostatic dust removal plate system. The height difference of the second maintenance window is ≥1.5m. The electrostatic dust removal plate system and the first liquid collecting bucket are both built-in beams supported by the dust removal tower at the front and rear ends. The second maintenance window is suitable for disassembling and assembling the electrostatic dust removal plate system and the first liquid collecting bucket.

7. The multi-stage wet dust removal process according to any one of claims 1 to 6, characterized in that: In the electrostatic dust removal step, the electrostatic dust removal plates are intermittently powered on for dust removal and spray washing. When the spray flushing pipe system above the electrostatic dust removal plates sprays liquid to the electrostatic dust removal plates, the electrostatic dust removal plates suspend dust removal.

8. The multi-stage wet dust removal process according to any one of claims 1 to 6, characterized in that: A second liquid collecting hopper is arranged below the horizontal air pipe, a pair of side walls of the second liquid collecting hopper are vertical plates or inclined plates, and the other pair of side walls are both stepped structures, the adjacent steps of the stepped structure are spaced apart and partially overlapped in the upper and lower directions, a collecting trough is arranged at the cone tip of the second liquid collecting hopper, and the second liquid collecting hopper is suitable for collecting condensate dripping from the horizontal air pipe.

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