System for filtering dust in flue gas

Abstract

The invention relates to the field of dust removal equipment, in particular to a system for filtering dust in smoke, which comprises a spray tower and a purification tower, a smoke inlet is arranged at the top of the spray tower, a smoke outlet is arranged at the bottom of the lower part of the spray tower, the smoke outlet of the spray tower is communicated with an inlet of the purification tower, and a liquid collecting tank is further arranged on the spray tower below the smoke outlet. The smoke outlet of the spray tower is also connected with a filter device, the filter device comprises a filter screen and a cleaning assembly, and the cleaning assembly can clean the filter screen. According to the invention, the flow direction of the flue gas in the spray tower is consistent with the spray liquid of the spray device, so that the probability that the spray head of the spray device is blocked by dust particles in the flue gas can be effectively reduced, and the filter device can perform secondary dust removal and reduce the content of the dust particles when the flue gas enters the demister, so that the probability of blocking the demister is reduced.

Description

Technical Field

[0001] The invention relates to the field of dust removal equipment, in particular to a dust filtering system in flue gas. Background Art

[0002] The tail gas treatment in the sheet metal processing industry generally adopts spray tower to control dust. The tail gas of the sheet metal usually contains a lot of dust. After the sewage and water vapor in the tail gas are separated in the spray tower, the dust contained in the water vapor will block the demister in the purification tower and affect the normal operation of the spray tower.

[0003] At present, a Chinese patent application with publication number CN221867832U and publication date October 22, 2024 proposes a dust removal spray tower for plate production, including a tower body, a water tank is installed on one side of the tower body, a support plate is installed in the tower body, a motor is installed on the top of the support plate, a rotating rod is installed at the output end of the motor, at least one swirl plate is installed around the rotating rod, a filter plate is installed in the tower body and on the swirl plate, an air inlet is installed on one side of the tower body, and an air outlet is installed on the top of the tower body; a water tank is installed on one side of the tower body, a water pump is installed on the top of the water tank, a water pipe is installed at the output end of the water pump, a nozzle is installed at one end of the water pipe that passes through the tower body, the nozzle is located above the filter plate, a cleaning component is installed around the rotating rod, at least one discharge trough is opened in the tower body, and the cleaning component cooperates with the filter plate and the discharge trough.

[0004] When in use, the nozzle sprays the flue gas in the tower body, and the cleaning component cleans the upper and lower surfaces of the filter plate, thereby reducing the situation where wood chips and dust block the filter plate.

[0005] With regard to the above-mentioned related technologies, since the filter plate is installed under the nozzle, the droplets sprayed from the nozzle will be blocked by the filter plate, and the droplets can only drip from the filter holes of the filter plate and mix with the flue gas in the tower body, which is not conducive to the uniform mixing of the droplets and the flue gas, and affects the efficiency of the droplets in absorbing waste gas and dust in the flue gas. Summary of the invention

[0006] In order to reduce the probability of dust blocking the nozzle and the demister during the exhaust gas treatment process, the present invention provides a dust filtering system in the flue gas.

[0007] The present invention provides a dust filtration system in flue gas, which adopts the following technical solution: A dust filtering system in flue gas comprises a spray tower and a purification tower, wherein the outlet of the spray tower is connected to the inlet of the purification tower, a spray device is installed in the spray tower, a demister is installed in the purification tower, a smoke inlet is arranged above the spray tower, a smoke outlet is arranged below the spray tower, the smoke outlet is connected to the purification tower, the smoke outlet is connected to the bottom of the demister, a liquid collecting tank is arranged at the bottom of the spray tower, the liquid collecting tank is located below the smoke outlet, a sewage outlet is connected to the liquid collecting tank, the spray device is arranged below the smoke inlet; a filtering device is arranged on the smoke outlet, and the filtering device comprises: a guide pipe, one end of which is open and connected with the smoke outlet, the other end of the guide tube is vertically arranged inside the spray tower toward the spray device, and the vertical section of the guide tube is annularly provided with through holes; the filter screen is arranged in a cylindrical shape, the filter screen is sleeved on the vertical section of the guide tube, and the filter screen cover is arranged on the through holes; the cleaning component, the cleaning component comprises: a driving component, the driving component is fixedly arranged on the guide tube for rotation; a support member, the support member is fixedly arranged on a side of the driving component facing the filter screen; a brush, the brush is detachably mounted on a side of the support member facing the filter screen, the brush contacts the outer peripheral surface of the filter screen, and is used for cleaning the filter screen.

[0008] By adopting the above technical scheme, the flue gas enters the spray tower from the smoke inlet above the spray tower, moves downward in the spray tower, and is finally discharged from the smoke outlet below the spray tower into the purification tower. The flue gas purified by the spray tower enters the purification tower and moves upward. The flue gas is purified again by the demister and then discharged into the atmosphere from the top of the purification tower. In the process of the flue gas moving from top to bottom in the spray tower, the flue gas will first pass through the spray device, and the droplets sprayed by the spray device will combine with the dust particles and harmful gases in the flue gas. After the droplets absorb the dust particles and harmful gases, they become sewage and gather in the liquid collecting tank at the bottom of the spray tower. Secondly, after the smoke passes through the spray device to separate the sewage from the water vapor, the sewage is finally discharged through the sewage outlet, and the smoke passes through the filter device installed at the smoke outlet and enters the purification tower from the smoke outlet. , the filtering device will further filter the dust particles in the separated water vapor; when the water vapor passes through the filtering device, the water vapor will first be filtered through the filter screen, and the filter screen will isolate the dust in the water vapor that is not absorbed by the droplets, or the small dust particles that are absorbed by the droplets but not deposited on the outside of the filter screen, and the filtered water vapor enters the purification tower through the through holes on the guide pipe, thereby reducing the dust particle content in the water vapor entering the purification tower and reducing the probability of clogging the defogger in the purification tower; at the same time, since the dust particles in the spray tower are in a humid environment, the dust has stickiness after absorbing water, and it is easy to stick to the filter holes of the filter screen and clog the filter screen, and the filter screen is set inside the spray tower and is not convenient to clean. The brush in the cleaning component can clean the filter screen on the outside of the filter screen, thereby reducing the probability of the filter screen being clogged.

[0009] In this way, the flue gas is arranged to move downward from the top of the spray tower, so that the flue gas moves along the nozzle of the spray device, reducing the probability that the dust particles in the flue gas will block the spray device; and the setting of the filter can further filter the flue gas discharged from the spray tower, reducing the probability that the flue gas discharged from the spray tower will block the demister in the purification tower; the through holes for flue gas circulation provided on the vertical section of the guide pipe can increase the flow area of ​​the flue gas, thereby improving the efficiency of dust filtration, and the vertically arranged through holes and filter can effectively reduce the probability that the sprayed droplets fall directly on the outside of the filter, and reduce the probability that dust particles fall directly into the filter holes of the filter and block the filter; the setting of the cleaning component can scrape off the dust particles attached to the filter on the outside of the filter, and the brush can dredge the dust particles in the filter holes, further reducing the probability that the dust particles will block the filter, making the filter device more practical and reliable when filtering sticky dust particles inside the spray tower.

[0010] Optionally, a cover body is also provided at the top of the vertical section of the guide tube, and the upper end face of the cover body is conically arranged. The edge diameter of the cover body is larger than the diameter of the vertical section of the guide tube, and the edge of the cover body blocks the filter in the vertical direction. A limiting groove is provided on the lower end face of the cover body; a limiting ring is also provided at the end of the vertical section of the guide tube, and the cover body is fixedly connected to the guide tube by clamping the limiting groove in the limiting ring.

[0011] By adopting the above technical solution, after the filter is sleeved on the vertical section of the guide tube, the cover body is fixed on the top of the vertical section of the guide tube. When fixing the cover body, the limit ring is clamped inside the limit groove to fix it; the upper end surface of the cover body is set to a cone to play a guiding role, and the droplets falling on the cover body will flow along the upper end surface of the cover body to the edge of the cover body; and the edge of the cover body is shielded above the filter in the vertical direction, which can reduce the probability of droplets falling in the gap between the filter and the guide tube. Such a setting of the cover body can reduce the probability of droplets converging at the top of the vertical section of the guide tube, and reduce the probability of droplets flowing into the through hole along the side wall of the guide tube after converging; the cover body shielding above the filter can also reduce the probability of droplets converging on the filter, and reduce the probability of droplets flowing into the through hole from the gap between the filter and the guide tube.

[0012] Optionally, a support platform is further provided on the vertical section of the guide tube, and the support platform is arranged below the through hole. The upper end surface of the support platform is arranged in a conical surface, and the lower end support of the filter is arranged on the conical surface of the support platform. The upper end of the filter is abutted against the lower end surface of the cover body, and a sealing gasket is arranged between the filter and the cover body.

[0013] By adopting the above technical solution, when installing the filter, the filter is sleeved on the vertical section of the guide tube, and the lower end surface of the filter is pressed against the upper conical surface of the support platform, and then the cover is pressed against the upper end surface of the filter. In this way, the filter is clamped on the upper and lower ends of the filter by the cover and the support platform, which effectively improves the stability of the filter; the conical upper end surface of the support platform and the sealing gasket between the cover and the filter effectively improve the sealing of the filter, reducing the probability of dust particles passing through the gaps on the upper and lower sides of the filter.

[0014] Optionally, the drive assembly includes: a rotating bearing, the inner ring surface of the rotating bearing is fixedly arranged above the cover body; an impeller, the impeller includes: an intermediate ring, the intermediate ring is fixedly arranged on the outer ring surface of the rotating bearing; fan blades, the fan blades are fixedly arranged on the outer peripheral side of the intermediate ring; and an outer peripheral ring, the outer peripheral ring is fixedly arranged on the side of the fan blade away from the intermediate ring.

[0015] By adopting the above technical solution, when the flue gas in the spray tower moves from top to bottom, the flue gas flow will drive the blades of the impeller to rotate and generate power. During the rotation of the impeller, the brush will be driven to clean the outside of the filter. At the same time, the impeller can also play a separation role during rotation. The flue gas passing through the impeller will rotate with the rotation of the impeller and generate a vortex at the impeller. The dust with larger mass rotates under the action of the vortex and is separated to the periphery under the action of centrifugal force and adheres to the inner wall of the spray tower or moves downward and falls into the liquid collecting tank at the bottom, thereby reducing the probability of large particles of dust flowing to the filter with the air flow and clogging the filter. Using the impeller as a driving component in this way can effectively reduce the probability of damage caused by connecting the motor to the humid environment inside the spray tower; at the same time, the flue gas flow is used to drive the impeller to rotate to generate power, and a vortex is generated at the impeller to separate large particles of dust, thereby reducing the probability of large particles clogging the filter; the setting of the rotating bearing can reduce the friction of the impeller rotation and reduce the speed of the airflow required when the impeller rotates; the peripheral ring can reduce the probability of the fan blades swinging when the impeller rotates, improve the stability of the fan blades when rotating, and thereby reduce the energy loss during the impeller rotation.

[0016] Optionally, the impeller is arranged in a conical shape, and the middle position of the impeller is higher than the edge position of the impeller.

[0017] By adopting the above technical solution, the impeller is set in a conical shape with a high middle and a low edge, so that the impeller has a guide effect. When droplets adhere to the blades of the impeller, the droplets will flow along the blades to a lower position at the edge of the blades due to the effect of gravity, thereby reducing dust and sewage attached to the blades and improving the rotation efficiency of the impeller.

[0018] Optionally, a guide assembly is further provided inside the spray tower, and the guide assembly includes: a plurality of first guide plates, each of which is fixedly provided on the inner wall of the spray tower, and is provided above the impeller, the first guide plate is provided in a spiral shape, and the rotation direction of the first guide plate is consistent with the rotation direction of the impeller, and the first guide plate guides the movement direction of the airflow inside the spray tower to the direction opposite to the fan blade; a second guide plate corresponding to the first guide plate one by one, one end of the second guide plate is connected to the lower end of the first guide plate, and the other end of the second guide plate is connected to the higher end of the adjacent first guide plate, the second guide plate is provided in an arc shape, and a plurality of the second guide plates form a closure at a position corresponding to the impeller, and the second guide plate is used to guide the airflow inside the spray tower to an area inside the spray tower close to the axis.

[0019] By adopting the above technical solution, when the airflow inside the spray tower flows through the first guide plate area, the airflow near the inner wall of the spray tower will rotate along the direction of the first guide plate, and the rotating airflow near the inner wall of the spray tower will drive the airflow in the middle of the spray tower to rotate. Since the rotation direction of the first guide plate is consistent with the rotation direction of the impeller, the rotating airflow will blow toward the blades of the impeller along the direction of the first guide plate, thereby increasing the force of the airflow on the impeller; the second guide plate connects the adjacent first guide plates to prevent the airflow from passing through the gap between the first guide plates. At the same time, the second guide plate forms a closing at the position corresponding to the impeller, which converges the airflow inside the spray tower to the middle of the spray tower. At the same time, the air velocity at the impeller position is increased due to the reduction of the flow area at the closing, thereby further increasing the force of the airflow on the impeller.

[0020] In this way, the first guide plate can drive the airflow at the impeller position to rotate, and drive the airflow to blow against the blades of the impeller, thereby increasing the power of the impeller's rotation; the second guide plate can form a constriction at the impeller position, thereby increasing the speed of the airflow at the impeller and further increasing the power of the impeller's rotation; at the same time, forming a constriction at the impeller that is less than or equal to the impeller diameter can also control most of the airflow inside the spray tower to pass through the impeller, and cooperate with the rotation of the impeller to make more droplets and dust particles adhere to the impeller, and under the rotation of the impeller, large particles of dust can be better thrown to the peripheral area, and large particles of dust can be better separated, thereby filtering large particles of dust before the flue gas passes through the filter.

[0021] Optionally, a swirl plate is further installed inside the spray tower, the direction of the swirl plate is opposite to the direction of the blades in the impeller, and the swirl plate is arranged above the spray device.

[0022] By adopting the above technical scheme, the setting of the swirl plate enables the flue gas to flow downward as a whole in a swirl manner when flowing inside the spray tower. The swirl plate is set above the spray device, so that the airflow is rotated before passing through the spray device. On the one hand, it can increase the path and time of the flue gas flowing in the spray tower, and increase the probability of the droplets sprayed from the spray tower combining with the dust in the flue gas, thereby improving the dust removal effect; on the other hand, it can also reduce the swirl plate from blocking the droplets sprayed from the spray device, making the sprayed droplets more uniform, promoting the droplets to better combine with the dust in the flue gas, and further improving the dust removal effect; at the same time, the swirl plate drives the flue gas to rotate and flow in the spray tower, and can also move large particles of dust toward the inner wall of the spray tower under the action of centrifugal force, promoting the large particles of dust to combine to form droplets with larger mass, which are easier to be separated when passing through the impeller later.

[0023] Optionally, multiple groups of knocking components are arranged on the cover body, and the knocking components include: a connecting rod, one end of the connecting rod is rotatably set on the edge of the cover body, and the connecting rod is rotatably set in the vertical direction; a limit platform, the limit platform is rotatably set on the edge of the cover body, the limit platform is set corresponding to the connecting rod, and the limit platform is used to support and limit the connecting rod; a ball, the ball is fixedly set on one end of the connecting rod away from the cover body; a guide plate is provided on the top of the brush, the front end of the guide plate rotating toward the brush is lower than the other end of the guide plate, and the higher end of the guide plate is located in the middle position of the top of the brush, the guide plate is cooperated with the connecting rod or the ball, and the guide plate is used to drive the ball to rise.

[0024] By adopting the above technical solution, since the cover body is fixed, the connecting rod and the ball are restricted to rotate only in the vertical direction. When the brush rotates with the driving assembly, the guide plate at the front end of the brush in the rotation direction will contact the connecting rod or the ball. Since the front end of the guide plate facing the rotation direction of the brush is lower than the other end, when the brush rotates, the connecting rod and the ball will be supported on the top of the guide plate and guided to rise as the guide plate rises. When the brush rotates past the highest end of the guide plate, the ball and the connecting rod will lose the support of the guide plate and will fall downward under the action of gravity and hit the top of the brush. The brush continues to rotate, and the connecting rod and the ball fall from the brush and are supported on the limit table. The limit table limits the ball to a height where it can contact the guide plate, reducing the probability that the ball falls too low to cooperate with the guide plate, and waits for the next brush to pass by, repeating the above-mentioned impact action again, thereby achieving the knocking of the brush.

[0025] In this way, when the brush cleans the filter, sticky dust particles will stick to the brush, and as the cleaning time increases, more dust particles will stick to the brush, affecting the cleaning effect. By setting a knocking component, whenever the brush passes the position of the ball of the connecting rod, the guide plate above the brush will lift the connecting rod and the ball, and knock the brush under the action of gravity after the connecting rod and the ball pass through the guide plate. The dust particles attached to the brush can be shaken off during the knocking. The continuous knocking of the ball on the brush during the rotation of the brush can reduce the dust particles attached to the brush, improve the cleaning force of the brush on the filter, and thereby reduce the probability of filter clogging; the setting of the ball can effectively increase the mass of the connecting rod end, thereby improving the knocking and vibration effect of the knocking component on the brush, and improving the cleaning force of the brush.

[0026] Optionally, the support member includes: a first support portion, one end of which is fixed to an end of the driving assembly close to the filter; a second support portion, one end of which is fixedly arranged at an end of the driving assembly away from the filter, the other end of the second support portion is fixedly connected to the other end of the first support portion, the first support portion, the second support portion and the driving assembly constitute a triangular support frame, the brush is fixedly arranged on a side of the first support portion close to the filter; a slot is provided on the brush, the first support portion is clamped in the slot, and a plurality of positioning holes are correspondingly provided on the slot and the first support portion.

[0027] By adopting the above technical solution, a triangular support frame composed of a first support part, a second support part and a driving assembly is used, and the brush is installed on the first support part. The first support part can fix the brush, and the second support part can provide a pressing force for the brush in an oblique direction, and the triangular support frame can provide effective support for the brush, thereby improving the stability of the brush; the setting of the card slot on the brush can increase the contact area between the brush and the first support part, and provide a more stable support for the brush in the horizontal direction; the multiple positioning holes set up play a role in height adjustment, and fixing the positioning holes on the brush on the positioning holes at different heights on the first support part can adjust the different heights of the brush. The setting of such a support member can increase the stability of the brush in the vertical direction, and the setting of the positioning slot can increase the stability of the brush in the horizontal direction, so that the brush can rotate more stably on the filter surface when cleaning the filter surface.

[0028] Optionally, the through hole is inclined, and the side of the through hole close to the inner circumference of the guide tube is higher than the side of the through hole close to the outer circumference of the guide tube; the filter holes on the filter screen are inclined, and the side of the filter holes on the filter screen close to the through hole is higher than the side away from the through hole.

[0029] By adopting the above technical solution, the through holes and the filter holes of the filter screen are set to be inclined with the inside higher and the outside lower, which can reduce the probability of droplets and dust particles entering the through holes with the flue gas. At the same time, when sewage gathers on the through holes and the filter holes and flows, the setting of high inside and low outside can also guide the sewage to flow to the outside, reducing the probability of sewage entering the guide pipe.

[0030] In summary, the present invention includes at least one of the following beneficial technical effects: The flue gas flow direction inside the spray tower is arranged to be consistent with the spray liquid of the spray device, which can effectively reduce the probability of dust particles in the flue gas clogging the nozzle of the spray device. At the same time, a filtering device is arranged at the smoke outlet at the bottom of the spray tower. The flue gas is filtered by the filtering device after being dust-removed by the spray device for secondary dust removal, thereby reducing the dust particle content when the flue gas enters the demister, thereby reducing the probability of clogging the demister.

[0031] Since the internal environment of the spray tower is humid, the dust particles become sticky after absorbing water and easily stick to the filter, causing blockage of the filter. In addition, since the inside of the spray tower is not easy to clean, the filtration efficiency is affected. The present application provides a cleaning component on the filter device to clean the filter, which can effectively improve the practicality of the filter device. At the same time, the cleaning component is driven by the airflow inside the spray tower, and there is no need to install an external drive device inside the spray tower. At the same time, the impeller not only provides power but also separates large dust particles. After the dust particles adhere to the impeller, the dust particles are separated to the outer area under the action of centrifugal force as the impeller rotates. When the dust particles in the outer area move downward, it is not easy for them to flow into the filter with the flue gas, and then cooperate with the filter to play a role of secondary filtration.

[0032] A guide assembly is arranged at the driving assembly position of the filtering device. The first guide plate in the guide assembly guides the airflow to generate a swirl to sweep the impeller in the driving assembly, thereby increasing the impact force on the impeller. The second guide plate forms a closing at the impeller position to increase the air flow rate at the impeller, further increase the impact force on the impeller, and thus increase the power of the impeller. At the same time, the rotating airflow generated by the cooperation of the first guide plate and the swirl plate also helps to separate large particles of dust to the peripheral area, promotes the combination of dust particles, and facilitates the subsequent separation of large particles of dust.

[0033] A knocking component is installed on the filter device in conjunction with the cleaning component. The knocking component can knock and vibrate the brush in the cleaning component to help the brush shake off attached dust particles, thereby improving the cleaning effect of the brush on the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 is a schematic diagram of the internal structure of an embodiment of the present invention; Figure 3 Schematic diagram of the installation position of the flow guide assembly and the filter device in the embodiment of the present invention; Figure 4 2 is a schematic diagram of the overall structure of the flow guide assembly in an embodiment of the present invention; Figure 5 Schematic diagram of the explosion structure of the filter device in the embodiment of the present invention; Figure 6 is a schematic diagram of an exploded structure of a filtering device in another embodiment of the present invention; Figure 7 yes Figure 6 A partial enlarged schematic diagram of part A; Figure 8 It is a schematic diagram of the overall structure of the brush in an embodiment of the present invention.

[0035] Description of reference numerals: 100, spray tower; 101, smoke inlet; 102, smoke outlet; 110, liquid collecting tank; 111, sewage outlet; 200, purification tower; 210, demister; 300, spray device; 400, filter device; 410, guide tube; 411, through hole; 412, support platform; 413, sealing gasket; 414, limiting ring; 420, filter screen; 430, cover body; 431, limiting groove; 500, cleaning component; 510, support member; 511, The first supporting part; 512, the second supporting part; 520, the brush; 521, the slot; 522, the positioning hole; 523, the guide plate; 600, the driving assembly; 610, the rotating bearing; 620, the impeller; 621, the intermediate ring; 622, the fan blade; 623, the outer ring; 700, the guide assembly; 710, the first guide plate; 720, the second guide plate; 730, the swirl plate; 800, the knocking assembly; 810, the connecting rod; 820, the limit table; 830, the ball bearing. DETAILED DESCRIPTION

[0036] The following combination Figures 1 to 8 The present invention is described in further detail.

[0037] The embodiment of the present invention discloses a dust filtering system in flue gas. Figure 1 to Figure 2A dust filtering system in flue gas mainly includes a spray tower 100 and a purification tower 200. The top of the spray tower 100 is provided with a smoke inlet 101, and the bottom is provided with a smoke outlet 102. The smoke outlet 102 of the spray tower 100 is connected with the entrance of the purification tower 200. The spray tower 100 is located below the smoke outlet 102 and is also provided with a liquid collecting tank 110. The spray tower 100 is located between the smoke inlet 101 and the smoke outlet 102. A swirl plate 730, a spray device 300, a guide assembly 700 and a filter device 400 are sequentially arranged from top to bottom. The smoke enters the smoke inlet 101 at the top of the spray tower 100. After entering the spray tower 100, the flue gas flows from top to bottom. The flue gas first passes through the swirl plate 730 to generate a swirl, then passes through the spray area below the spray device 300, and further generates a swirl at the position of the guide component 700 and accelerates the flow rate before entering the filter device 400. After the flue gas inside the spray tower 100 is adsorbed by droplets and filtered by the filter device 400, the sewage and water vapor are separated, and the sewage settles to the liquid collecting tank 110 at the bottom of the spray tower 100. The water vapor passes through the filter device 400 and enters the purification tower 200, and is discharged into the air after passing through the demister 210 in the purification tower 200.

[0038] Since the tail gas of the sheet metal industry contains a lot of dust, when conventional spray towers 100 and purification towers 200 are used for dust removal, the dust particles in the flue gas are likely to clog the nozzles in the spray tower 100 and the demister 210 in the purification tower 200, affecting normal operation. In the technical solution of this embodiment, the nozzle in the spray tower 100 sprays droplets downward, and the flue gas in the spray tower 100 also moves from top to bottom. The movement direction of the flue gas is consistent with the spraying direction of the nozzle, which can effectively reduce the probability that the dust particles in the flue gas will clog the nozzle; and after the filter device 400 removes dust from the flue gas with the sprayed droplets, it can also filter the flue gas before it enters the purification tower 200, further reducing the content of dust particles in the flue gas entering the purification tower 200, and thereby reducing the probability that the dust particles in the flue gas will clog the demister 210.

[0039] Reference Figure 1 and Figure 2The spray tower 100 and the purification tower 200 are arranged side by side, and the tops of the spray tower 100 and the purification tower 200 are both opened. The spray tower 100 and the purification tower 200 are connected below by a pipeline. The opening at the top of the spray tower 100 is a smoke inlet 101, and the position below the spray tower 100 that is connected to the purification tower 200 is a smoke outlet 102. The smoke enters the spray tower 100 from the smoke inlet 101 at the top of the spray tower 100, and enters the purification tower 200 from the smoke outlet 102 at the bottom of the spray tower 100, and is finally discharged into the atmosphere from the top of the purification tower 200. A spray device 300 is arranged inside the spray tower 100, and the spray device 300 includes a water tank arranged outside the spray tower 100 and a water tank arranged inside the spray tower 100. The nozzle at the top is connected to the external water tank by a water inlet pipe, and the water pump installed in the water tank pumps the liquid to the nozzle and sprays it downward inside the spray tower 100. The nozzle is installed in the spray tower 100 near the smoke inlet 101; the demister 210 is installed in the purification tower 200, and the flue gas enters the purification tower 200 after being dusted and impurity-removed in the spray tower 100, and is discharged into the atmosphere after being dusted and stored in the purification tower 200; a liquid collecting tank 110 is also provided at the bottom of the spray tower 100 for collecting droplets sprayed by the spray device 300, and the liquid collecting tank 110 is connected to the outside of the spray tower 100 through a sewage outlet 111 provided at the bottom, and the sewage outlet 111 is used to discharge the sewage collected in the liquid collecting tank 110.

[0040] Reference Figure 2 In the purification tower 200, a swirl plate 730 is arranged between the smoke inlet 101 and the nozzle of the spray device 300. After the smoke enters the spray tower 100 from the smoke inlet 101, it first passes through the swirl plate 730 and then flows to the spray area below. When the smoke passes through the swirl plate 730, the smoke enters the swirl plate 730 area at a certain speed. The inclined blades or spiral structure of the swirl plate 730 cause the airflow to rotate and generate a swirl inside the spray tower 100. In the swirling airflow, the dust particles with larger mass are inertial. The swirl plate 730 is thrown outward and slides down along the tower wall under the action of centrifugal force, and finally enters the liquid collecting tank 110, which plays the role of separating large dust particles in advance, thereby reducing the subsequent large dust particles entering the filter device 400 and reducing the burden of the filter device 400; at the same time, the swirl plate 730 can also make the flue gas more evenly distributed in the spray tower 100, increase the contact area and time between the flue gas and the spray droplets, thereby promoting a better combination of the droplets sprayed by the spray device 300 and the dust in the flue gas, thereby improving the dust removal efficiency.

[0041] Reference Figure 2 and Figure 3The rotating flue gas will pass through the guide assembly 700 when flowing downward in the spray area. The guide assembly 700 includes a first guide plate 710 and a second guide plate 720. The first guide plate 710 is fixedly arranged on the inner wall of the spray tower 100. The first guide plate 710 is arranged in a spiral shape, and the spiral direction of the first guide plate 710 is consistent with the spiral direction of the swirl plate 730, thereby guiding the flue gas flowing in the spray tower 100 to rotate in the same direction. In this embodiment, the swirl plate 730 and the first guide plate 710 are both arranged clockwise, so that the flue gas in the spray tower 100 can flow clockwise.

[0042] Reference Figure 3 and Figure 4 In this embodiment, three groups of first guide plates 710 are provided, all of which are spirally fixed in the spray tower 100, and the edge positions on both sides of the first guide plates 710 are set to close inwardly. Three groups of second guide plates 720 are set corresponding to the first guide plates 710. The second guide plates 720 are connected between two adjacent first guide plates 710, and one end of the second guide plate 720 is connected to the lower end of one of the first guide plates 710, and the other end of the second guide plate 720 is connected to the higher end of the adjacent first guide plate 710. The second guide plates 720 are set to close inwardly along the edges of the first guide plates 710 in an arc shape, so as to guide the airflow inside the spray tower 100 from the edge position to the middle position. When the smoke flows in the guide assembly 700 position, the smoke further rotates clockwise under the action of the first guide plate 710, and flows to the middle position of the spray tower 100 under the action of the second guide plate 720, thereby forming an airflow with stronger rotation and faster flow speed near the central axis of the spray tower 100.

[0043] Reference Figure 2 , Figure 3 and Figure 5, after passing through the guide assembly 700, the smoke flows to the filter device 400. The filter device 400 includes a guide pipe 410, a filter screen 420, a cover body 430, and a cleaning assembly 500. The guide pipe 410 is fixedly arranged on the smoke outlet 102, and connects the interior of the spray tower 100 with the smoke outlet 102. The guide pipe 410 is a 90-degree elbow with an opening at one end. The open end of the guide pipe 410 is horizontally connected to the smoke outlet 102, and the other end is vertically arranged upward inside the spray tower 100. A plurality of through holes 411 are evenly opened on the side wall of the vertical section of the guide pipe 410 for connecting the interior of the spray tower 100 with the smoke outlet 102. A circular support platform 412 is also arranged below the vertical section of the guide pipe 410. The support platform 412 is arranged below the through hole 411, and the upper end surface of the support platform 412 is arranged in a conical surface. The filter screen 420 is annular. The cover 430 is arranged and sleeved on the vertical section of the guide tube 410, the bottom of the filter screen 420 is supported on the conical surface of the support platform 412, the cover body 430 is arranged in a conical shape as a whole, a limiting groove 431 is arranged in the middle position of the bottom of the cover body 430, and a limiting ring 414 is arranged in the middle position of the top of the vertical section of the corresponding guide tube 410, the limiting groove 431 of the cover body 430 is clamped on the limiting ring 414 so that the cover body 430 is fixedly arranged on the top of the guide tube 410, after the cover body 430 is installed on the guide tube 410, the bottom of the cover body 430 abuts against the upper end surface of the filter screen 420, and a sealing gasket 413 is arranged between the filter screen 420 and the cover body 430 for sealing; the diameter of the bottom of the cover body 430 is larger than the diameter of the outer peripheral surface of the filter screen 420, so that after the cover body 430 and the filter screen 420 are both installed on the guide tube 410, the cover body 430 can play a shielding role above the filter screen 420.

[0044] After the flue gas is sprayed in the spraying area, the sprayed droplets combine with the dust in the flue gas to form sewage that drips downward and finally gathers in the liquid collecting tank 110. The guide pipe 410 and the filter screen 420 are arranged vertically, which can reduce the probability of sewage flowing into the filter holes and the through holes 411 of the guide pipe 410 when it falls; the setting of the cover body 430 can play a shielding role above the guide pipe 410 and the filter screen 420. When the sewage drips from above, the dripping sewage is blocked above the cover body 430, and the sewage is guided to drip at the edge of the cover body 430, thereby The probability of sewage flowing into the guide pipe 410 along the guide pipe 410 and the filter screen 420 is further reduced; and after the flue gas enters the spraying, some small dust particles are not easily captured by the droplets, or the small dust particles are captured by the droplets and flow into the smoke outlet 102 along the flue gas due to their light weight, blocking the demister 210 in the purification tower 200. The setting of the filter screen 420 can block and filter the small dust particles in the flue gas, reduce the probability of small dust particles entering the purification tower 200 through the smoke outlet 102, and thereby reduce the probability of demister 210 being blocked.

[0045] Reference Figure 5 and Figure 6 The cleaning component 500 includes a support member 510, a brush 520 and a driving component 600, wherein the driving component 600 is fixedly mounted on the cover body 430, the support member 510 is fixedly arranged on the driving component 600, and the brush 520 is fixedly arranged on the support member 510. In other embodiments, the driving component 600 can use a motor to drive the support member 510 and the brush 520 to rotate, but since the environment in the spray tower 100 is humid and difficult to maintain, the motor is easily damaged when installed in the spray tower 100. In this embodiment, the driving component 600 uses the flow of flue gas to generate power.

[0046] Reference Figure 5 and Figure 6 The driving assembly 600 includes a rotating bearing 610 and an impeller 620. A connecting portion is fixedly arranged on the top of the cover body 430. The inner ring surface of the rotating bearing 610 is fixedly arranged on the connecting portion to fix the rotating bearing 610. The impeller 620 includes an intermediate ring 621, a fan blade 622 and an outer peripheral ring 623. The intermediate ring 621 is sleeved on the outer ring surface of the rotating bearing 610 to rotatably install the impeller 620. The fan blade 622 is spirally arranged on the outer peripheral surface of the intermediate ring 621. The outer peripheral ring 623 is fixedly arranged on the outer peripheral surface of the fan blade 622 to enhance the stability of the fan blade 622. The setting direction of the fan blade 622 is consistent with the setting direction of the first guide plate 710 and the swirl plate 730. Relatively speaking, in this embodiment, the first guide plate 710 and the swirl plate 730 are arranged clockwise, and the blades 622 of the impeller 620 are arranged counterclockwise, so that the rotating airflow in the spray tower 100 can blow against the blades 622 of the impeller 620, blowing the impeller 620 to rotate clockwise, thereby increasing the thrust of the airflow on the impeller 620. In order to reduce the probability of dust particles and droplets adhering to the impeller 620, the impeller 620 is arranged in a conical setting with a high middle and a low edge, so that the impeller 620 also has a drainage effect. The conical impeller 620 helps to guide the droplets attached to the impeller 620 to the edge position, reduce the accumulation of droplets on the surface of the impeller 620, and improve the rotation efficiency.

[0047] Using the impeller 620 as the power component of the cleaning component 500, on the one hand, does not require the use of external power, thereby reducing the risk of damage caused by installing the motor inside the spray tower 100. On the other hand, the guide component 700 guides the rotating airflow to the center position above the impeller 620, which effectively increases the driving force on the impeller 620. The dust particles collide with the impeller 620 with the rotating airflow and adhere to the impeller 620. The centrifugal force generated when the impeller 620 rotates also helps to throw large dust particles to the edge position, further separating the large dust particles to the edge position inside the spray tower 100 and flowing into the liquid collection tank 110, reducing the filtering burden of the filter 420.

[0048] Reference Figure 5 and Figure 6 The support member 510 includes a first support portion 511 and a second support portion 512. The first support portion 511 is vertically fixed on the impeller 620, and the second support portion 512 is obliquely fixed on the outer peripheral ring 623 of the impeller 620. The other end of the first support portion 511 is fixedly connected to the other end of the second support portion 512, so that the first support portion 511, the second support portion 512 and the impeller 620 form a triangular support structure as a whole. The first support portion 511 is also vertically provided with a plurality of positioning holes 522 for connecting with the brush 520. The brush 520 includes a connecting portion and a hair portion. The connecting portion is provided with a slot 521 that cooperates with the first support portion 511, and the slot 521 is provided with a positioning hole 522, during installation, the slot 521 is connected to the first support part 511, and the positioning hole 522 in the slot 521 and the positioning hole 522 on the ground support part are connected with screws to fix the brush 520. After the brush 520 is fixed, the brush part of the brush 520 contacts the outer peripheral surface of the filter 420. When the brush 520 cleans the surface of the filter 420, the first support part 511 plays a supporting role in the vertical direction, and the second support part 512 plays a supporting role in the lateral direction of the brush 520, providing a clamping force for the brush 520. The setting of the slot 521 provides horizontal support for the brush 520, so that the brush 520 can be stably on the surface of the filter 420 for cleaning.

[0049] Reference Figure 7 and Figure 8 The cover 430 is also provided with a knocking assembly 800, which includes a connecting rod 810, a limiting platform 820 and a ball 830, wherein the connecting rod 810 is fixedly arranged at the edge of the cover 430 through a rotating shaft, the ball 830 is fixedly arranged at one end of the connecting rod 810 away from the cover 430, the limiting platform 820 is arranged below the connecting rod 810, the connecting rod 810 can rotate around the rotating shaft in the vertical direction, and the connecting rod 810 is supported on the limiting platform 820 when it falls, and a guide plate 523 is arranged on the top of the corresponding brush 520, and the guide plate 523 is a structure with one end high and the other end low, wherein the guide plate 523 is close to the front of the rotation direction. The guide plate 523 is lower than the other end, and the position of the brush 520 corresponds to the position of the ball 830 in the vertical direction. When the brush 520 rotates to the position corresponding to the knocking assembly 800, the guide plate 523 contacts the ball 830, and as the brush 520 rotates, the ball 830 rises along the guide plate 523 from the lower end of the guide plate 523 to the higher end of the guide plate 523, and falls on the top of the brush 520 under the action of gravity after passing the position of the guide plate 523, thereby knocking the brush 520. After the brush 520 rotates past the position of the knocking assembly 800, the connecting rod 810 is supported on the limit platform 820 waiting for the next brush 520 to pass.

[0050] When the brush 520 cleans the filter 420 at the outside of the filter 420, some of the dust particles dropped by the brush 520 will stick to the brush 520. As time goes by, too much dust stuck to the brush 520 will affect the cleaning effect of the brush 520. The setting of the knocking component 800 makes the knocking component 800 be lifted up each time the brush 520 passes through the knocking component 800, and the ball 830 will be knocked on the top of the brush 520 after the guide plate 523 of the brush 520 passes the position of the ball 830, so as to shake off the dust particles attached to the brush 520, thereby playing a role in upgrading the brush 520.

[0051] In order to improve the cleaning effect of the cleaning assembly 500 and the knocking assembly 800 , in this embodiment, four groups of the cleaning assembly 500 and the knocking assembly 800 are arranged along the filter screen 420 .

[0052] The implementation principle of a dust filtration system in flue gas according to an embodiment of the present invention is as follows: the flue gas enters the spray tower 100 from the smoke inlet 101 at the top of the spray tower 100, and the flue gas first passes through the swirl plate 730 in the spray tower 100 to generate a swirl, and then the flue gas moves downward through the spray area of ​​the spray device 300, and the flue gas is separated into sewage and water vapor with dust particles through the combination with droplets in the spray area, and the sewage settles to the bottom and is concentrated in the liquid collecting tank 110 at the bottom of the spray tower 100, and the water vapor with dust particles continues to move downward through the guide component 700, further enhancing the rotation of the airflow and being gathered to the central area to increase the flow speed of the flue gas, and the rotating flue gas is gathered in the central area and continues to flow downward to push the blades of the driving component 600 The wheel 620 rotates, and the flue gas finally flows to the through hole 411 of the guide tube 410. The water vapor containing dust particles is filtered by the filter 420 and flows into the purification tower 200 from the smoke outlet 102. It is purified again by the demister 210 in the purification tower 200 and then discharged into the atmosphere. When the water vapor containing dust particles passes through the filter 420, the dust particles will adhere to the filter 420 and block the filter 420. Therefore, a cleaning component 500 is provided. The impeller 620 in the cleaning component 500 drives the brush 520 to rotate and clean the outside of the filter 420. A knocking component 800 is installed at the corresponding position of the cleaning component 500 to knock and vibrate the brush 520 in the cleaning component 500 to reduce the dust particles attached to the brush 520.

[0053] In summary, the present application sets the flow direction of the smoke inside the spray tower 100 to be consistent with the spraying direction of the nozzle of the spray device 300, which can reduce the blockage of the nozzle. The filter device 400 is set inside the spray tower 100 to reduce the content of dust particles in the smoke discharged from the spray tower 100, thereby reducing the probability of clogging the demister 210. The setting of the cleaning component 500 can help the filter device 400 clean the filter screen 420, reduce the probability of sticky dust clogging the filter screen 420 in a humid environment, and improve the practicality of the filter device 400. A knocking component 800 is set at the position corresponding to the cleaning component 500. The knocking component 800 can vibrate and knock on the brush 520 in the cleaning component 500, thereby assisting the cleaning effect of the brush 520, thereby improving the cleaning effect of the cleaning component 500; the impeller 620 is used as the driving component 600 of the cleaning component 500 to reduce the probability of damage to the external driving device when installed in a humid environment, and a guide component 700 is set to guide the airflow to blow toward the impeller 620, thereby increasing the thrust on the impeller 620, and further improving the cleaning effect on the filter 420.

[0054] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dust filtering system in flue gas, comprising a spray tower (100) and a purification tower (200), wherein the outlet of the spray tower (100) is connected to the inlet of the purification tower (200), a spray device (300) is arranged above the spray tower (100), and a demister (210) is installed in the purification tower (200), characterized in that: A smoke inlet (101) is arranged above the spray tower (100), a smoke outlet (102) is arranged below the spray tower (100), the smoke outlet (102) is communicated with the purification tower (200), the smoke outlet (102) is communicated to the bottom of the demister (210), a liquid collecting tank (110) is arranged at the bottom of the spray tower (100), the liquid collecting tank (110) is located below the smoke outlet (102), a sewage outlet (111) is connected to the liquid collecting tank (110), and the spray device (300) is arranged below the smoke inlet (101); The smoke outlet (102) is provided with a filtering device (400), and the filtering device (400) comprises: a guide tube (410), one end of the guide tube (410) being open and connected to the smoke outlet (102), the other end of the guide tube (410) being vertically arranged inside the spray tower (100) toward the spray device (300), and a vertical section of the guide tube (410) being circumferentially provided with through holes (411); A filter screen (420), the filter screen (420) being arranged in a cylindrical shape, the filter screen (420) being sleeved on the vertical section of the guide tube (410), and the filter screen (420) being covered on the through hole (411); A cleaning assembly (500), the cleaning assembly (500) comprising: a driving assembly (600), the driving assembly (600) being fixedly disposed on the guide tube (410) and configured to rotate; A support member (510), the support member (510) being fixedly arranged on a side of the driving assembly (600) facing the filter screen (420); A brush (520) is detachably mounted on a side of the support member (510) facing the filter screen (420), and the brush (520) is in contact with an outer peripheral surface of the filter screen (420) and is used to clean the filter screen (420).

2. The dust filtration system in flue gas according to claim 1, characterized in that: A cover body (430) is also provided at the top of the vertical section of the guide tube (410); the upper end surface of the cover body (430) is arranged in a conical shape; the edge diameter of the cover body (430) is larger than the diameter of the vertical section of the guide tube (410); the edge of the cover body (430) blocks the filter screen (420) in the vertical direction; and a limiting groove (431) is provided on the lower end surface of the cover body (430); A limiting ring (414) is also provided at the end of the vertical section of the guide tube (410), and the cover body (430) is fixedly connected to the guide tube (410) by clamping the limiting groove (431) into the limiting ring (414).

3. A dust filtration system in flue gas according to claim 2, characterized in that: A support platform (412) is also provided on the vertical section of the guide tube (410). The support platform (412) is provided below the through hole (411). The upper end surface of the support platform (412) is provided in the form of a cone. The lower end support of the filter screen (420) is provided on the cone surface of the support platform (412). The upper end of the filter screen (420) abuts against the lower end surface of the cover body (430), and a sealing gasket (413) is provided between the filter screen (420) and the cover body (430).

4. A dust filtration system in flue gas according to any one of claims 2 to 3, characterized in that: The driving assembly (600) comprises: A rotating bearing (610), the inner annular surface of the rotating bearing (610) being fixedly disposed above the cover body (430); An impeller (620), wherein the impeller (620) comprises: An intermediate sleeve ring (621), the intermediate sleeve ring (621) being fixedly arranged on the outer ring surface of the rotating bearing (610); A fan blade (622), wherein the fan blade (622) is fixedly arranged on the outer peripheral side of the intermediate ring (621); An outer peripheral ring (623), the outer peripheral ring (623) being fixedly arranged on a side of the fan blade (622) away from the middle ring (621).

5. The dust filtration system in flue gas according to claim 4, characterized in that: The impeller (620) is arranged in a conical shape, and the middle position of the impeller (620) is higher than the edge position of the impeller (620).

6. The dust filtration system in flue gas according to claim 4, characterized in that: A flow guide component (700) is also provided inside the spray tower (100), and the flow guide component (700) comprises: a plurality of first guide plates (710), each of the first guide plates (710) being fixedly arranged on the inner wall of the spray tower (100), and the first guide plates (710) being arranged above the impeller (620), the first guide plates (710) being arranged in a spiral shape, the rotation direction of the first guide plates (710) being consistent with the rotation direction of the impeller (620), and the first guide plates (710) guiding the movement direction of the airflow inside the spray tower (100) to a direction opposite to the fan blades (622); A second guide plate (720) corresponding one to the first guide plate (710), one end of the second guide plate (720) being connected to a lower end of the first guide plate (710), and the other end of the second guide plate (720) being connected to a higher end of an adjacent first guide plate (710), the second guide plate (720) being arranged in an arc shape, a plurality of the second guide plates (720) forming a closed end at a position corresponding to the impeller (620), and the second guide plate (720) being used to guide the airflow inside the spray tower (100) to an area inside the spray tower (100) close to the axis.

7. The dust filtration system in flue gas according to claim 4, characterized in that: A swirl plate (730) is also installed inside the spray tower (100), the direction of the swirl plate (730) being opposite to the direction of the blades (622) in the impeller (620), and the swirl plate (730) is arranged above the spray device (300).

8. A dust filtration system in flue gas according to any one of claims 2-3, characterized in that: A plurality of knocking components (800) are arranged around the cover body (430), and the knocking components (800) include: A connecting rod (810), one end of the connecting rod (810) being rotatably disposed on the edge of the cover body (430), and the connecting rod (810) being rotatably disposed along a vertical direction; a limiting platform (820), the limiting platform (820) being rotatably disposed on the edge of the cover body (430), the limiting platform (820) being disposed correspondingly to the connecting rod (810), and the limiting platform (820) being used to support and limit the connecting rod (810); A ball (830), the ball (830) being fixedly disposed on an end of the connecting rod (810) away from the cover body (430); A guide plate (523) is arranged on the top of the brush (520); the front end of the guide plate (523) rotating towards the brush (520) is lower than the other end of the guide plate (523); the higher end of the guide plate (523) is located at the middle position of the top of the brush (520); the guide plate (523) is arranged in cooperation with the connecting rod (810) or the ball (830); and the guide plate (523) is used to drive the ball (830) to rise.

9. A dust filtration system in flue gas according to any one of claims 1 to 3, characterized in that: The support member (510) comprises: A first support portion (511), one end of the first support portion (511) being fixed to one end of the driving assembly (600) close to the filter screen (420); a second support portion (512), one end of the second support portion (512) being fixedly arranged at an end of the driving assembly (600) away from the filter screen (420), the other end of the second support portion (512) being fixedly connected to the other end of the first support portion (511), the first support portion (511), the second support portion (512) and the driving assembly (600) forming a triangular support frame, and the brush (520) being fixedly arranged at a side of the first support portion (511) close to the filter screen (420); The brush (520) is provided with a slot (521), the first support portion (511) is snap-connected to the slot (521), and a plurality of positioning holes (522) are correspondingly provided on the slot (521) and the first support portion (511).

10. A dust filtration system in flue gas according to any one of claims 1 to 3, characterized in that: The through hole (411) is arranged in an inclined manner, and a side of the through hole (411) close to the inner peripheral surface of the guide tube (410) is higher than a side of the through hole (411) close to the outer peripheral surface of the guide tube (410); The filter holes on the filter screen (420) are arranged obliquely, and the side of the filter holes on the filter screen (420) close to the through hole (411) is higher than the side away from the through hole (411).

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