A dust filtration system in flue gas

Abstract

The present application relates to a kind of dust filtering system in flue gas, it is related to the field of dust removal equipment, it includes spray tower and purification tower, the top of spray tower is provided with smoke inlet, bottom is provided with smoke outlet, the smoke outlet of spray tower is communicated with the inlet of purification tower, spray tower is also provided with liquid collecting tank below the smoke outlet, the smoke outlet of spray tower is also connected with filter device, filter device includes filter screen, cleaning assembly, cleaning assembly can clean filter screen.The present application is set to the flow direction of flue gas in spray tower and the liquid of spray device is consistent, can effectively reduce the probability that dust particles in flue gas will block the spray head of spray device, filter device can carry out secondary dust removal, reduce the dust particle content when flue gas enters demister, in turn reduce the probability of blocking demister.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dust removal equipment, in particular to a dust filtering system in flue gas. BACKGROUND

[0002] The tail gas treatment of the plate processing industry generally uses a spray tower type to treat dust. The tail gas of the plate usually contains a large amount 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, affecting the normal work of the spray tower.

[0003] At present, a dust removal spray tower for plate production is disclosed in Chinese patent application No. CN221867832U, published on October 22, 2024, which includes a tower body, a water tank installed on one side of the tower body, a support plate installed in the tower body, a motor installed on the top of the support plate, a rotating rod installed on the output end of the motor, at least one cyclone plate installed on the rotating rod, a filter plate installed on the cyclone plate in the tower body, an air inlet installed on one side of the tower body, and an air outlet 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 on the output end of the water pump, a spray head is installed on the end of the water pipe penetrating the tower body, the spray head is located above the filter plate, a cleaning assembly is installed on the rotating rod, at least one discharge slot is formed in the tower body, and the cleaning assembly cooperates with the filter plate and the discharge slot.

[0004] In use, the spray head sprays the flue gas in the tower body, and the cleaning assembly cleans the upper and lower surfaces of the filter plate, thereby reducing the blockage of the filter plate by wood dust.

[0005] According to the above related technology, since the filter plate is installed below the spray head, the droplets sprayed by the spray head are 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 absorbing waste gas and dust in the flue gas. SUMMARY

[0006] In order to reduce the probability of dust blocking the spray head and the demister during the tail gas treatment process, the present application provides a dust filtering system in flue gas.

[0007] The present application provides a dust filtering system in flue gas, which adopts the following technical solution:

[0008] The application relates to a dust filtering system in flue gas, which comprises a spraying tower and a purification tower, the outlet of the spraying tower and the inlet of the purification tower are communicated, a spraying device is arranged in the spraying tower, a demister is arranged in the purification tower, an air inlet is arranged above the spraying tower, an air outlet is arranged below the spraying tower, the air outlet is communicated with the purification tower, the air outlet is communicated below the demister, a liquid collecting tank is arranged at the bottom of the spraying tower, the liquid collecting tank is below the air outlet, a pollution outlet is connected to the liquid collecting tank, the spraying device is arranged below the air inlet, a filtering device is arranged on the air outlet, the filtering device comprises a guide pipe, one end of the guide pipe is open and communicated with the air outlet, the other end of the guide pipe is vertically arranged in the spraying tower and faces the spraying device, through holes are arranged on the vertical section of the guide pipe, a filter screen is arranged in a cylinder shape, the filter screen is arranged on the vertical section of the guide pipe and covers the through holes, a cleaning assembly comprises a driving assembly, the driving assembly is fixedly arranged on the guide pipe and used for rotating, a support is fixedly arranged on the side of the driving assembly facing the filter screen, a brush is detachably arranged on the side of the support facing the filter screen, the brush is in contact with the outer circumferential surface of the filter screen and used for cleaning the filter screen.

[0009] Through the above technical scheme, the flue gas enters the spraying tower from the air inlet above the spraying tower and moves downward in the spraying tower and is finally discharged from the air outlet below the spraying tower into the purification tower, the flue gas after purification in the spraying tower moves upward in the purification tower, and the flue gas after purification by the demister is discharged into the atmosphere from the top of the purification tower; during the downward movement of the flue gas in the spraying tower, the flue gas first passes through the spraying device, the liquid drops sprayed by the spraying device combine with the dust particles and harmful gas in the flue gas, the liquid drops absorb the dust particles and harmful gas to become sewage and gather in the liquid collecting tank at the bottom of the spraying tower, and then the sewage is separated from the water vapor by the spraying device, and finally discharged through the pollution outlet, the flue gas enters the purification tower from the air outlet through the filtering device arranged at the air outlet, and the filtering device further filters the dust particles in the separated water vapor; when the water vapor passes through the filtering device, the water vapor is first filtered by the filter screen, the filter screen separates the dust in the water vapor which is not absorbed by the liquid drops or the small dust particles which are absorbed by the liquid drops but not deposited outside the filter screen, the filtered water vapor enters the purification tower through the through holes on the guide pipe, so as to reduce the content of the dust particles in the water vapor entering the purification tower and reduce the probability of blocking the demister in the purification tower; meanwhile, the dust particles in the spraying tower are in a humid environment, the dust particles are sticky after absorbing water and are easy to stick to the filter holes of the filter screen and block the filter screen, the brush in the cleaning assembly can clean the filter screen outside the filter screen, so as to reduce the probability of blocking the filter screen.

[0010] Thus, the flue gas is arranged to move from the upper part of the spray tower to the lower part, so that the flue gas moves along the spray head of the spray device, reducing the probability that dust particles in the flue gas will block the spray device. The filter screen is arranged to 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 hole provided in the vertical section of the guide pipe for flue gas circulation can increase the flow area of the flue gas, thereby improving the efficiency of dust filtration. The vertically arranged through hole and the filter screen can effectively reduce the probability that the liquid droplets will directly fall on the outside of the filter screen, thereby reducing the probability that the dust particles will directly fall into the filter holes of the filter screen and block the filter screen. The arrangement of the cleaning assembly can scrape off the dust particles attached to the filter screen on the outside of the filter screen. The brush can dredge the dust particles in the filter holes, further reducing the probability that the dust particles will block the filter screen, making the filtering device more practical and reliable when filtering the dust particles with viscosity inside the spray tower.

[0011] Optionally, the top of the vertical section of the guide pipe is further provided with a cover body, 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 pipe, the edge of the cover body is vertically arranged above the filter screen, and the lower end face of the cover body is provided with a limiting groove. The end of the vertical section of the guide pipe is further provided with a limiting ring, and the cover body is fixedly connected with the guide pipe by clamping the limiting groove in the limiting ring.

[0012] By adopting the above technical scheme, after the filter screen is sleeved on the vertical section of the guide pipe, the cover body is fixed above the vertical section of the guide pipe. When the cover body is fixed, the limiting ring is clamped in the limiting groove for fixation. The conical arrangement of the upper end face of the cover body can play a guiding role. The liquid droplets falling above the cover body will flow to the edge of the cover body along the upper end face of the cover body. The edge of the cover body is vertically arranged above the filter screen, which can reduce the probability that the liquid droplets will fall into the gap between the filter screen and the guide pipe. The arrangement of the cover body can reduce the probability that the liquid droplets will converge at the top end of the vertical section of the guide pipe and the probability that the liquid droplets will flow into the through hole along the side wall of the guide pipe after convergence. The cover body shielding above the filter screen can also reduce the probability that the liquid droplets will converge on the filter screen and the probability that the liquid droplets will flow into the through hole from the gap between the filter screen and the guide pipe.

[0013] Optionally, the vertical section of the guide pipe is further provided with a support table, the support table is arranged below the through hole, the upper end face of the support table is conically arranged, the lower end of the filter screen is supported on the conical surface of the support table, the upper end of the filter screen abuts against the lower end face of the cover body, and a sealing gasket is arranged between the filter screen and the cover body.

[0014] By adopting the technical scheme, when the filter screen is installed, the filter screen is sleeved on the vertical section of the guide pipe, and the lower end surface of the filter screen is pressed against the conical upper end surface of the support table, and then the cover body is pressed against the upper end surface of the filter screen. Thus, the cover body and the support table clamp the filter screen from the upper and lower end surfaces of the filter screen, effectively improving the stability of the filter screen. The conical upper end surface of the support table and the sealing gasket arranged between the cover body and the filter screen effectively improve the sealing performance of the filter screen, and reduce the probability of dust particles passing through the gap between the upper and lower sides of the filter screen.

[0015] Optionally, the driving assembly comprises: a rotating bearing, an inner ring surface of the rotating bearing is fixedly arranged above the cover body; and an impeller, the impeller comprises: an intermediate collar, the intermediate collar is fixedly arranged on an outer ring surface of the rotating bearing; a fan blade, the fan blade is fixedly arranged on an outer circumferential side of the intermediate collar; and an outer circumferential collar, the outer circumferential collar is fixedly arranged on a side of the fan blade away from the intermediate collar.

[0016] By adopting the technical scheme, in the process that the flue gas in the spray tower moves from top to bottom, the flue gas flow drives the fan blade of the impeller to rotate to generate power. In the process of rotation of the impeller, the brush is cleaned on the outer side of the filter screen. Meanwhile, in the process of rotation of the impeller, the impeller also plays a role in separation. The flue gas passing through the impeller rotates with the rotation of the impeller, and generates a cyclone at the impeller. The dust with large mass rotates under the action of the cyclone, and separates to the periphery under the action of centrifugal force and adheres to the inner wall of the spray tower or moves downward to fall into the bottom collecting tank, thereby reducing the probability that the large-particle dust flows to the filter screen along with the airflow and blocks the filter screen. Thus, using the impeller as the driving assembly can effectively reduce the probability of damage caused by connecting the motor in the humid environment inside the spray tower. Meanwhile, the flue gas flow drives the impeller to rotate to generate power, and the impeller generates a cyclone to separate the large-particle dust, thereby reducing the probability that the large-particle dust blocks the filter screen. The setting of the rotating bearing can reduce the friction of the rotation of the impeller, and reduce the speed of the airflow flow required in the process of rotation of the impeller. The outer circumferential collar can reduce the probability of swinging of the fan blade in the process of rotation of the impeller, improve the stability of the fan blade in the process of rotation, and further reduce the energy loss in the process of rotation of the impeller.

[0017] Optionally, the impeller is conical, and a middle position of the impeller is higher than an edge position of the impeller.

[0018] By adopting the technical scheme, the impeller is conical with the middle position being higher than the edge position, so that the impeller has a flow guiding effect. When the liquid droplets adhere to the fan blade of the impeller, the liquid droplets flow to the lower edge position along the fan blade under the action of gravity, thereby reducing the dust and sewage adhered to the fan blade and improving the rotation efficiency of the impeller.

[0019] Optionally, the inside of the spray tower is further provided with a flow guide assembly, the flow guide assembly comprises: a plurality of first flow guide plates, the first flow guide plates are fixedly arranged on the inner wall of the spray tower, and the first flow guide plates are arranged above the impeller, the first flow guide plates are arranged in a spiral shape, the rotation direction of the first flow guide plates is consistent with the rotation direction of the impeller, and the first flow guide plates guide the movement direction of the airflow in the spray tower to a direction opposite to the fan blades; a second flow guide plate corresponding to the first flow guide plate, one end of the second flow guide plate is connected to the lower end of the first flow guide plate, the other end of the second flow guide plate is connected to the higher end of the adjacent first flow guide plate, the second flow guide plate is arranged in an arc shape, and a plurality of second flow guide plates form a narrowing at the position corresponding to the impeller, and the second flow guide plate is used to guide the airflow in the spray tower to the area close to the shaft center in the spray tower.

[0020] By adopting the above technical scheme, when the airflow in the spray tower flows through the first flow guide plate area, the airflow close to the inner wall of the spray tower will rotate along the direction of the first flow guide plate, and the rotating airflow close to the inner wall of the spray tower will drive the airflow at the middle position of the spray tower to rotate, since the rotation direction of the first flow guide plate is consistent with the rotation direction of the impeller, the rotating airflow will blow against the fan blades of the impeller along the direction of the first flow guide plate, thereby improving the blowing force of the airflow on the impeller; the second flow guide plate connects the adjacent first flow guide plates, so that the airflow cannot pass through the gap between the first flow guide plates, and at the same time, the second flow guide plate forms a narrowing at the position corresponding to the impeller, thereby converging the airflow in the spray tower to the middle position of the spray tower, and increasing the airflow velocity at the position of the impeller due to the smaller flow area at the narrowing, thereby further improving the blowing force of the airflow on the impeller.

[0021] In this way, the first flow guide plate can drive the airflow at the position of the impeller to rotate and drive the airflow to blow against the fan blades of the impeller, thereby improving the power of the impeller rotation; the second flow guide plate can form a narrowing at the position of the impeller, thereby increasing the airflow velocity at the position of the impeller and further improving the power of the impeller rotation; at the same time, forming a narrowing at the position of the impeller with a diameter less than or equal to the diameter of the impeller can control most of the airflow in the spray tower to pass through the impeller, cooperate with the rotation of the impeller to make more liquid droplets and dust particles adhere to the impeller, and better separate the large particle dust under the rotation of the impeller, thereby filtering the large particle dust before the flue gas passes through the filter screen.

[0022] Optionally, the inside of the spray tower is further provided with a flow guide assembly, the flow guide assembly comprises: a plurality of first flow guide plates, the first flow guide plates are fixedly arranged on the inner wall of the spray tower, and the first flow guide plates are arranged above the impeller, the first flow guide plates are arranged in a spiral shape, the rotation direction of the first flow guide plates is consistent with the rotation direction of the impeller, and the first flow guide plates guide the movement direction of the airflow in the spray tower to a direction opposite to the fan blades; a second flow guide plate corresponding to the first flow guide plate, one end of the second flow guide plate is connected to the lower end of the first flow guide plate, the other end of the second flow guide plate is connected to the higher end of the adjacent first flow guide plate, the second flow guide plate is arranged in an arc shape, and a plurality of second flow guide plates form a narrowing at the position corresponding to the impeller, and the second flow guide plate is used to guide the airflow in the spray tower to the area close to the shaft center in the spray tower.

[0023] By adopting the technical scheme, the cyclone plate is arranged to make the flue gas flow in a cyclone manner downward in the spray tower, and the cyclone plate is arranged above the spraying device, so that the airflow is rotated before passing through the spraying device, which can increase the flow path and time of the flue gas in the spray tower, improve the combination probability of the liquid drops sprayed by the spray tower and the dust in the flue gas, and further improve the dust removal effect; on the other hand, the cyclone plate can also reduce the shielding of the liquid drops sprayed by the spraying device, so that the sprayed liquid drops are more uniform, promote the better combination of the liquid drops and the dust in the flue gas, and further improve the dust removal effect; at the same time, the cyclone plate drives the flue gas to rotate and flow in the spray tower, and also moves the large-particle dust to the direction close to the inner wall of the spray tower under the action of centrifugal force, promotes the combination of the large-particle dust to form liquid drops with larger mass, and further makes the liquid drops more easily separated when passing through the impeller in the subsequent process.

[0024] Optionally, a plurality of knocking assemblies are arranged on the cover body, and each knocking assembly comprises: a connecting rod, one end of the connecting rod being rotationally arranged at the edge of the cover body, the connecting rod being rotationally arranged in the vertical direction; a limiting table, the limiting table being rotationally arranged at the edge of the cover body, the limiting table being arranged corresponding to the connecting rod, and the limiting table being used for supporting and limiting the connecting rod; and a ball, the ball being fixedly arranged at the end of the connecting rod away from the cover body; the top of the brush is provided with a guide plate, the front end of the guide plate toward the rotation direction of the brush being lower than the other end of the guide plate, the high end of the guide plate being located at the middle position of the top of the brush, the guide plate being arranged in cooperation with the connecting rod or the ball, and the guide plate being used for driving the ball to rise.

[0025] By adopting the above technical scheme, since the cover body is fixed and the connecting rod and the ball are limited 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, and since the front end of the guide plate toward 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 with the rising of the guide plate, when the brush rotates past the highest end of the guide plate, the ball and the connecting rod will fall downward under the action of gravity and impact on the top of the brush, the brush continues to rotate, the connecting rod and the ball fall from the brush and are supported on the limiting table, the limiting table limits the ball to a height that can contact the guide plate, reduces the probability that the falling height of the ball is too low to cooperate with the guide plate, and waits for the next brush to pass through to repeat the above impact action, so as to realize the knocking of the brush.

[0026] Thus, when the brush cleans the filter screen, dust particles with adhesion 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 the knocking assembly, 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 after the connecting rod and the ball pass the guide plate, the brush will be knocked under the action of gravity. The dust particles adhering to the brush can be shaken off during knocking. The continuous knocking of the ball on the brush during the rotation of the brush can reduce the dust particles adhering to the brush, improve the cleaning strength of the brush on the filter screen, and thus reduce the probability of filter screen blockage. The setting of the ball can effectively increase the mass of the end of the connecting rod, thereby improving the knocking and vibration effect of the knocking assembly on the brush and improving the cleaning strength of the brush.

[0027] Optionally, the support piece comprises: a first support part, one end of the first support part is fixed at one end of the driving assembly close to the filter screen; a second support part, one end of the second support part is fixedly arranged at one end of the driving assembly away from the filter screen, the other end of the second support part and the other end of the first support part are fixedly connected, the first support part, the second support part and the driving assembly form a triangular support frame, the brush is fixedly arranged on one side of the first support part close to the filter screen; a clamping groove is arranged on the brush, the first support part is clamped in the clamping groove, and a plurality of positioning holes are arranged on the clamping groove and the first support part correspondingly.

[0028] By adopting the above technical scheme, the triangular support frame composed of the first support part, the second support part and the driving assembly is used, and the brush is installed on the first support part. The first support part can fix the brush, the second support part can provide compression force for the brush in the oblique direction, and the triangular support frame can provide effective support for the brush to improve the stability of the brush. The clamping groove arranged on the brush can increase the contact area between the brush and the first support part, and provide more stable support for the brush in the horizontal direction. The plurality of positioning holes play the role of height adjustment. 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 the support piece can increase the stability of the brush in the vertical direction, and the setting of the positioning groove can increase the stability of the brush in the horizontal direction, so that the brush can rotate more stably on the surface of the filter screen during cleaning.

[0029] Optionally, the through hole is arranged obliquely, one side of the through hole close to the inner circumferential surface of the guide pipe is higher than the other side of the through hole close to the outer circumferential surface of the guide pipe; the filter holes on the filter screen are arranged obliquely, one side of the filter holes on the filter screen close to the through hole is higher than the other side of the filter holes away from the through hole.

[0030] By adopting the technical scheme, the through hole and the filter hole of the filter screen are arranged in an inclined manner with the inner part being higher and the outer part being lower, so that the probability of liquid drops and dust particles entering the through hole along with the flue gas is reduced, and when the sewage flows on the through hole and the filter hole, the sewage is guided to flow outside due to the arrangement of the inner part being higher and the outer part being lower, so that the probability of the sewage entering the guide pipe is reduced.

[0031] In summary, the present application has at least one of the following beneficial technical effects:

[0032] The flue gas flow direction in the spray tower is arranged to be consistent with the liquid spray of the spray device, which can effectively reduce the probability of dust particles in the flue gas blocking the spray head of the spray device, and a filter device is arranged at the position of the smoke outlet at the bottom of the spray tower, which is used for filtering after the flue gas passes through the spray device for dust removal, for secondary dust removal, to reduce the dust particle content when the flue gas enters the demister, and to further reduce the probability of blocking the demister.

[0033] Due to the humid environment inside the spray tower, the dust particles are sticky after absorbing water and are easy to stick to the filter screen to block the filter screen, and due to the inconvenience of cleaning inside the spray tower, the filtering efficiency is affected, the cleaning assembly is arranged on the filter device to clean the filter screen, which can effectively improve the practicality of the filter device, and the cleaning assembly is driven by the airflow inside the spray tower, without the need to install an external driving device inside the spray tower; meanwhile, the impeller also plays a role in separating large particle dust while providing power, after the dust particles adhere to the impeller, the dust particles are separated to the peripheral area under the action of centrifugal force while the impeller rotates, the dust particles in the peripheral area are not easy to flow into the filter screen along with the flue gas, and further cooperate with the filter screen to play a role in secondary filtration.

[0034] The flow guide assembly is arranged at the position of the driving assembly of the filter device, the first flow guide plate in the flow guide assembly guides the airflow to generate a cyclone to blow the impeller in the driving assembly, to improve the impact force on the impeller, the second flow guide plate forms a narrowing at the position of the impeller, to improve the air flow rate at the position of the impeller, to further improve the impact force on the impeller, and to further improve the power of the impeller; meanwhile, the rotating airflow generated by the cooperation of the first flow guide plate and the cyclone plate also helps to separate large particle dust to the peripheral area, to promote the combination of dust particles, to facilitate the subsequent separation of large particle dust.

[0035] The knocking assembly is installed on the filter device in cooperation with the cleaning assembly, which can knock and vibrate the brush in the cleaning assembly, to help the brush shake off the adhered dust particles, and to further improve the cleaning effect of the brush on the filter screen. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a whole structure schematic diagram of an embodiment of the present application;

[0037] Figure 2is a schematic view of the internal structure of an embodiment of the present application;

[0038] Figure 3 is a schematic view of the installation position of the flow guide assembly and the filtering device in an embodiment of the present application;

[0039] Figure 4 is a schematic view of the overall structure of the flow guide assembly in an embodiment of the present application;

[0040] Figure 5 is a schematic view of the exploded structure of the filtering device in an embodiment of the present application;

[0041] Figure 6 is a schematic view of the exploded structure of the filtering device in another view in an embodiment of the present application;

[0042] Figure 7 is Figure 6 is a schematic view of the local enlargement of part A in the embodiment of the present application;

[0043] Figure 8 is a schematic view of the overall structure of the brush in an embodiment of the present application.

[0044] BRIEF DESCRIPTION OF DRAWINGS 100, spray tower; 101, smoke inlet; 102, smoke outlet; 110, liquid collecting groove; 111, pollution outlet; 200, purification tower; 210, demister; 300, spraying device; 400, filtering device; 410, guide pipe; 411, through hole; 412, support table; 413, sealing gasket; 414, limiting ring; 420, filter screen; 430, cover body; 431, limiting groove; 500, cleaning assembly; 510, support piece; 511, first support part; 512, second support part; 520, brush; 521, clamping groove; 522, positioning hole; 523, guide plate; 600, driving assembly; 610, rotating bearing; 620, impeller; 621, middle collar; 622, fan blade; 623, outer peripheral collar; 700, flow guide assembly; 710, first flow guide plate; 720, second flow guide plate; 730, cyclone plate; 800, knocking assembly; 810, connecting rod; 820, limiting table; 830, ball. DETAILED DESCRIPTION

[0045] The present application will be further described below. Figures 1 to 8 The present application will be further described below.

[0046] The present application discloses a dust filtering system in flue gas. Referring to Figures 1 to 2The dust filtering system in flue gas mainly comprises a spray tower 100 and a purification tower 200, the spray tower 100 is provided with an inlet 101 at the top and an outlet 102 at the bottom, the outlet 102 of the spray tower 100 is communicated with the inlet of the purification tower 200, the spray tower 100 is further provided with a liquid collecting tank 110 below the outlet 102, the spray tower 100 is provided with a cyclone plate 730, a spraying device 300, a flow guide assembly 700 and a filtering device 400 from top to bottom between the inlet 101 and the outlet 102, the flue gas flows from top to bottom after entering the spray tower 100 from the inlet 101 at the top of the spray tower 100, the flue gas firstly generates cyclone after the cyclone plate 730 and then passes through the liquid spraying area below the spraying device 300, and further generates cyclone and accelerates the flow rate at the position of the flow guide assembly 700 and then enters the filtering device 400, the flue gas in the spray tower 100 is separated from the sewage and water vapor after the adsorption of the liquid drops and the filtration of the filtering device 400, the sewage is settled to the liquid collecting tank 110 at the bottom of the spray tower 100, and the water vapor enters the purification tower 200 after passing through the filtering device 400 and is discharged into the air after passing through the demister 210 in the purification tower 200.

[0047] Since the dust content in the tail gas of the plate industry is relatively high, when the conventional spray tower 100 and purification tower 200 are selected for dust removal, the dust in the flue gas is easy to block the spray head in the spray tower 100 and the demister 210 in the purification tower 200, which affects the normal work. The technical scheme in the embodiment, the spray head in the spray tower 100 sprays the liquid drops 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 spray head, which can effectively reduce the probability that the dust particles in the flue gas block the spray head; and the filtering device 400 can further filter the flue gas before entering the purification tower 200 after the liquid drops in the spray remove the dust from the flue gas, further reducing the dust particle content in the flue gas entering the purification tower 200, and further reducing the probability that the dust particles in the flue gas block the demister 210.

[0048] With reference to Figure 1 And Figure 2, the spray tower 100 and the purification tower 200 are provided side by side, the top of the spray tower 100 and the purification tower 200 is provided with an opening, the spray tower 100 and the purification tower 200 below are communicated through a pipeline, the opening at the top of the spray tower 100 is an inlet 101, the position of the spray tower 100 below communicated with the purification tower 200 is an outlet 102, the flue gas enters the spray tower 100 from the inlet 101 at the top of the spray tower 100, and then enters the purification tower 200 from the outlet 102 at the bottom of the spray tower 100, and finally is discharged into the atmosphere from the top of the purification tower 200, and the spray tower 100 is internally provided with a spraying device 300, the spraying device 300 comprises a water tank provided outside the spray tower 100 and a nozzle provided inside the spray tower 100, the nozzle is communicated to the outside water tank through a water inlet pipe, and the liquid is pumped to the nozzle inside the spray tower 100 by the water pump installed in the water tank and sprayed downward, the nozzle is installed in the spray tower 100 close to the inlet 101; a demister 210 is installed in the purification tower 200, the flue gas enters the purification tower 200 after dust and impurities are removed in the spray tower 100, and then is discharged into the atmosphere after dust and impurities are removed in the purification tower 200; the bottom of the spray tower 100 is also provided with a liquid collecting tank 110 for collecting liquid droplets sprayed by the spraying device 300, the liquid collecting tank 110 is communicated to the outside of the spray tower 100 through a blowdown port 111 provided at the bottom, and the blowdown port 111 is used to discharge the sewage collected in the liquid collecting tank 110.

[0049] With reference to Figure 2 , a cyclone plate 730 is arranged between the inlet 101 and the nozzle of the spraying device 300 in the purification tower 200, after the flue gas enters the spray tower 100 from the inlet 101, it first passes through the cyclone plate 730 and then flows downward to the spraying area, when the flue gas passes through the cyclone plate 730, the flue gas enters the area of the cyclone plate 730 at a certain speed, the inclined blades or spiral structure of the cyclone plate 730 makes the airflow rotate and generates a cyclone inside the spray tower 100, in the rotating airflow, the dust particles with larger mass are thrown to the outside due to inertia and slide downward along the wall under the action of centrifugal force, and finally enter the liquid collecting tank 110, which plays a role of separating large particle dust in advance, thereby reducing the large particle dust entering the filter device 400 and reducing the burden of the filter device 400; at the same time, the cyclone plate 730 can also make the flue gas more evenly distributed in the spray tower 100, increase the contact area and time of the flue gas and the liquid droplets, and thus promote the better combination of the liquid droplets sprayed by the spraying device 300 and the dust in the flue gas, and improve the dust removal efficiency.

[0050] With reference to Figure 2 and Figure 3, the rotating flow of flue gas will pass through the flow guide assembly 700 when flowing downward in the spraying area, the flow guide assembly 700 comprises a first flow guide plate 710 and a second flow guide plate 720, the first flow guide plate 710 is fixedly arranged on the inner wall of the spraying tower 100, the first flow guide plate 710 is arranged in a spiral shape, and the spiral direction of the first flow guide plate 710 is consistent with the spiral direction of the cyclone plate 730, thereby guiding the flue gas flowing in the spraying tower 100 to generate rotation in the same direction, in the embodiment, the cyclone plate 730 and the first flow guide plate 710 are both arranged clockwise, so that the flue gas in the spraying tower 100 can flow clockwise.

[0051] With reference to Figure 3 and Figure 4 , in the embodiment, the first flow guide plate 710 is arranged in three groups and fixed in the spraying tower 100 in a spiral shape, and the edge positions on both sides of the first flow guide plate 710 are arranged in a inwardly tapered manner, the second flow guide plate 720 is arranged in three groups corresponding to the first flow guide plate 710, the second flow guide plate 720 is connected between two adjacent first flow guide plates 710, one end of the second flow guide plate 720 is connected to the lower end of one of the first flow guide plates 710, the other end of the second flow guide plate 720 is connected to the upper end of the adjacent first flow guide plate 710, and the second flow guide plate 720 is arranged in an arc shape along the inwardly tapered edge of the first flow guide plate 710, guiding the airflow in the spraying tower 100 from the edge position to the middle position. When the flue gas flows to the position of the flow guide assembly 700, the flue gas further generates clockwise rotation under the action of the first flow guide plate 710, and flows to the middle position of the spraying tower 100 under the action of the second flow guide plate 720, thereby forming a more intense rotating airflow and a faster flowing speed at the position of the spraying tower 100 close to the central axis.

[0052] With reference to Figure 2 、 Figure 3 and Figure 5, the flue gas flows to the filter device 400 after passing through the flow guide assembly 700, the filter device 400 comprises a guide pipe 410, a filter screen 420, a cover 430 and a cleaning assembly 500, wherein the guide pipe 410 is fixedly arranged on the smoke outlet 102 and communicates the inside of the spray tower 100 with the smoke outlet 102, the guide pipe 410 is a ninety-degree elbow pipe with one end open, the open end of the guide pipe 410 is horizontally connected to the smoke outlet 102, and the other end is vertically arranged upwards in the inside of the spray tower 100, a plurality of through holes 411 are uniformly arranged on the side wall of the vertical section of the guide pipe 410 for communicating the inside of the spray tower 100 with the smoke outlet 102, and a circular support table 412 is arranged below the vertical section of the guide pipe 410, the support table 412 is arranged below the through holes 411, and the upper end surface of the support table 412 is conical, the filter screen 420 is annular and is sleeved on the vertical section of the guide pipe 410, the bottom of the filter screen 420 is supported on the conical surface of the support table 412, the cover 430 is conical, a limiting groove 431 is arranged at the middle position of the bottom of the cover 430, a limiting ring 414 is correspondingly arranged at the middle position of the top end of the vertical section of the guide pipe 410, the limiting groove 431 of the cover 430 is clamped on the limiting ring 414 to fix the cover 430 on the top of the guide pipe 410, and the bottom of the cover 430 abuts against the upper end surface of the filter screen 420 after the cover 430 is installed on the guide pipe 410, and a sealing gasket 413 is arranged between the filter screen 420 and the cover 430 for sealing; the diameter of the bottom of the cover 430 is greater than the diameter of the outer circumferential surface of the filter screen 420, so that the cover 430 can shield the filter screen 420 after the cover 430 and the filter screen 420 are both installed on the guide pipe 410.

[0053] After the flue gas is sprayed in the spray area, the liquid droplets sprayed out combine with the dust in the flue gas to form sewage which falls down and finally collects in the liquid collecting tank 110, the vertical arrangement of the guide pipe 410 and the filter screen 420 can reduce the probability of the sewage flowing into the filter holes and the through holes 411 of the guide pipe 410 when the sewage falls down, the arrangement of the cover 430 can shield the filter screen 420 from above when the sewage falls down from above, and guide the falling sewage to the edge of the cover 430 to further reduce the probability of the sewage flowing into the guide pipe 410 along the guide pipe 410 and the filter screen 420, and part of the small particle dust in the flue gas is not easy to be captured by the liquid droplets, or the small particle dust captured by the liquid droplets will flow into the smoke outlet 102 along the flue gas due to the light weight, block the demister 210 in the purification tower 200, the arrangement of the filter screen 420 can block and filter the small particle dust in the flue gas to reduce the probability of the small particle dust entering the purification tower 200 through the smoke outlet 102, and further reduce the probability of the demister 210 being blocked.

[0054] Referring toFigure 5 And Figure 6 The cleaning assembly 500 comprises a support 510, a brush 520 and a driving assembly 600, wherein the driving assembly 600 is fixedly installed on the cover 430, the support 510 is fixedly arranged on the driving assembly 600, and the brush 520 is fixedly arranged on the support 510. In other embodiments, the driving assembly 600 can drive the support 510 and the brush 520 to rotate by using a motor. However, since the environment in the spray tower 100 is humid and difficult to maintain, the motor installed in the spray tower 100 is easy to be damaged. In the present embodiment, the driving assembly 600 uses the flow of flue gas to generate power.

[0055] Referring to Figure 5 And Figure 6 The driving assembly 600 comprises a rotating bearing 610 and an impeller 620. The top of the cover 430 is fixedly provided with a connecting portion. 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 comprises a middle sleeve ring 621, a fan blade 622 and an outer peripheral sleeve ring 623. The middle sleeve 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 arranged in a spiral shape on the outer peripheral surface of the middle sleeve ring 621. The outer peripheral sleeve 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 arrangement direction of the fan blade 622 is opposite to the arrangement direction of the first guide plate 710 and the cyclone plate 730. In the present embodiment, the first guide plate 710 and the cyclone plate 730 are arranged clockwise, and the fan blade 622 of the impeller 620 is arranged counterclockwise. Therefore, the airflow rotating in the spray tower 100 can blow against the fan blade 622 of the impeller 620 to drive the impeller 620 to rotate clockwise, thereby improving the thrust of the airflow on the impeller 620. In order to reduce the probability of dust particles and liquid droplets adhering to the impeller 620, the impeller 620 is arranged in a conical shape with the middle being high and the edge being low. Therefore, the impeller 620 also has a flow guiding effect. The conical impeller 620 helps to guide the liquid droplets adhering to the impeller 620 to the edge position, reduces the accumulation of liquid droplets on the surface of the impeller 620, and improves the rotation efficiency.

[0056] The impeller 620 is used as the power assembly of the cleaning assembly 500. On the one hand, it does not need to use external power, thereby reducing the risk of damage caused by installing a motor inside the spray tower 100. On the other hand, the flow guiding assembly 700 guides the rotating airflow above the impeller 620 to the central position above the impeller 620, thereby effectively improving the thrust on the impeller 620. Dust particles are impacted on the impeller 620 by the rotating airflow, and adhere to the impeller 620. The centrifugal force generated when the impeller 620 rotates also helps to throw large particle dust to the edge position, thereby further separating the large particle dust to the edge position inside the spray tower 100 and flowing into the liquid collecting tank 110, thereby reducing the filtering burden of the filter screen 420.

[0057] Referring to Figure 5 and Figure 6 , the support 510 includes a first support part 511 fixed vertically on the impeller 620 and a second support part 512 fixed obliquely on the outer peripheral collar 623 of the impeller 620, the other end of the first support part 511 and the other end of the second support part 512 are fixedly connected, so that the first support part 511, the second support part 512 and the impeller 620 integrally constitute a triangular support structure, a plurality of positioning holes 522 for connecting with the brush 520 are further vertically arranged on the first support part 511, the brush 520 includes a connecting part and a bristle part, a clamping groove 521 matched with the first support part 511 is arranged on the connecting part, the positioning holes 522 are arranged in the clamping groove 521, when installed, the clamping groove 521 is clamped on the first support part 511, and the positioning holes 522 in the clamping groove 521 and the positioning holes 522 on the first support part 511 are connected by using screws, so that the brush 520 can be fixed, after the brush 520 is fixed, the bristle part of the brush 520 is in contact with the outer peripheral surface of the filter screen 420, when the brush 520 cleans the surface of the filter screen 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, so as to provide a pressing force for the brush 520, and the clamping groove 521 provides horizontal support for the brush 520, so that the brush 520 can be stably cleaned on the surface of the filter screen 420.

[0058] Referring to Figure 7 and Figure 8 , the cover 430 is further provided with a knocking assembly 800, the knocking assembly 800 includes a connecting rod 810, a limiting table 820 and a ball 830, 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 the end of the connecting rod 810 away from the cover 430, the limiting table 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 table 820 when it falls, the top of the corresponding brush 520 is provided with a guide plate 523, the guide plate 523 has a structure that one end is higher than the other end, the front end of the guide plate 523 close to the rotating direction is lower than the other end, 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 is in contact with the ball 830, and along with the rotation of the brush 520, the ball 830 rises from the low end of the guide plate 523 to the high end of the guide plate 523 along the guide plate 523, and after passing the position of the guide plate 523, the ball 830 falls on the top of the brush 520 under the action of gravity, thereby playing a role of 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 limiting table 820 to wait for the next brush 520 to pass.

[0059] When the brush 520 cleans the filter screen 420 outside the filter screen 420, the dust particles that are hung by the brush 520 will be attached to the brush 520. With the passage of time, too much dust attached to the brush 520 will affect the cleaning effect of the brush 520. The arrangement of the knocking assembly 800 makes the brush 520 lift the knocking assembly 800 every time the brush 520 passes through the knocking assembly 800, and knock the ball 830 at the top of the brush 520 after the guide plate 523 of the brush 520 passes through the position of the ball 830, so as to shake off the dust particles attached to the brush 520, thereby playing an advanced role on the brush 520.

[0060] In order to improve the cleaning effect of the cleaning assembly 500 and the knocking assembly 800, in the embodiment, the cleaning assembly 500 and the knocking assembly 800 are arranged with four groups along the filter screen 420.

[0061] The implementation principle of the dust filtering system in flue gas in the embodiment of the application is as follows: flue gas enters the spray tower 100 from the smoke inlet 101 at the top of the spray tower 100, the flue gas first generates a cyclone in the spray tower 100 through the cyclone plate 730, and then moves downward through the spraying area of the spraying device 300, the flue gas is separated into sewage and water vapor with dust particles in the spraying area through the combination with liquid drops, the sewage is settled to the bottom and is concentrated in the liquid collecting groove 110 at the bottom of the spray tower 100, and the water vapor with dust particles continues to move downward through the flow guide assembly 700, further enhances the rotation of the airflow and is gathered to the central area to increase the flow speed of the flue gas, the rotating and flowing flue gas is gathered to the central area and then continues to flow downward to rotate the impeller 620 of the driving assembly 600, and finally flows to the position of the through hole 411 of the guide pipe 410, the water vapor with dust particles flows into the purification tower 200 from the smoke outlet 102 after being filtered by the filter screen 420, and is discharged into the atmosphere after being purified again by the demister 210 in the purification tower 200; because the dust particles are attached to the filter screen 420 when the water vapor with dust particles passes through the position of the filter screen 420, the filter screen 420 is blocked by the dust particles, therefore, the cleaning assembly 500 is arranged, the impeller 620 of the cleaning assembly 500 drives the brush 520 to rotate to clean outside the filter screen 420, and the knocking assembly 800 is installed at the corresponding position of the cleaning assembly 500 to knock and vibrate the brush 520 in the cleaning assembly 500, so as to reduce the dust particles attached to the brush 520.

[0062] To sum up, the application sets the flow direction of the flue gas inside the spray tower 100 to be consistent with the spraying direction of the spray head of the spraying device 300, which can reduce the blockage of the spray head, the filter device 400 arranged inside the spray tower 100 can reduce the content of dust particles in the flue gas discharged from the spray tower 100, and further reduce the probability of blocking the demister 210; the arrangement of the cleaning assembly 500 can help the filter device 400 clean the filter screen 420, reduce the probability that the filter screen 420 is blocked by sticky dust in a humid environment, and improve the practicability of the filter device 400; the knocking assembly 800 is arranged at the corresponding position of the cleaning assembly 500, the knocking assembly 800 can vibrate and knock the brush 520 in the cleaning assembly 500, which can assist in cleaning the brush 520, and further improve the cleaning effect of the cleaning assembly 500; the impeller 620 is used as the driving assembly 600 of the cleaning assembly 500, which can reduce the probability of damage of the external driving device installed in a humid environment, and the flow guide assembly 700 is arranged to guide the airflow to blow on the impeller 620, which can increase the thrust on the impeller 620, and further improve the cleaning effect on the filter screen 420.

[0063] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A dust filtering system in flue gas, comprising a spray tower (100) and a purification tower (200), the outlet of the spray tower (100) and the inlet of the purification tower (200) are communicated, a spraying device (300) is arranged above the spray tower (100), and a demister (210) is installed in the purification tower (200), characterized in that: an inlet (101) is arranged above the spray tower (100), an outlet (102) is arranged below the spray tower (100), the outlet (102) is communicated with the purification tower (200), the outlet (102) is communicated below 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 outlet (102), a pollution outlet (111) is connected to the liquid collecting tank (110), and the spraying device (300) is arranged below the inlet (101); a filtering device (400) is arranged on the outlet (102), the filtering device (400) comprises: a guide pipe (410), one end of the guide pipe (410) is open and communicated with the outlet (102), the other end of the guide pipe (410) is vertically arranged inside the spray tower (100) and faces the spraying device (300), and through holes (411) are arranged on the vertical section of the guide pipe (410); a filter screen (420), the filter screen (420) is arranged in a cylindrical shape, the filter screen (420) is sleeved on the vertical section of the guide pipe (410), and the filter screen (420) covers the through holes (411); a cleaning assembly (500), the cleaning assembly (500) comprises: a driving assembly (600), the driving assembly (600) is fixedly arranged on the guide pipe (410) and used for rotating; a support (510), the support (510) is fixedly arranged on one side of the driving assembly (600) and faces the filter screen (420); a brush (520), the brush (520) is detachably arranged on one side of the support (510) and faces the filter screen (420), the brush (520) is in contact with the outer circumferential surface of the filter screen (420) and is used for cleaning the filter screen (420); a cover (430) is further arranged at the top of the vertical section of the guide pipe (410); the driving assembly (600) comprises: a rotating bearing (610), the inner ring surface of the rotating bearing (610) is fixedly arranged above the cover (430); a vane (620), the vane (620) comprises: an intermediate sleeve (621), the intermediate sleeve (621) is fixedly arranged on the outer ring surface of the rotating bearing (610); a fan blade (622), the fan blade (622) is fixedly arranged on the outer circumferential side of the intermediate sleeve (621); an outer circumferential sleeve (623), the outer circumferential sleeve (623) is fixedly arranged on the side of the fan blade (622) away from the intermediate sleeve (621). A plurality of groups of knocking assemblies (800) are arranged on the cover body (430), and the knocking assembly (800) comprises: A connecting rod (810) is rotationally arranged at one end of the cover body (430) edge, and the connecting rod (810) is rotationally arranged in the vertical direction; A limiting table (820) is rotationally arranged at the cover body (430) edge, and the limiting table (820) is correspondingly arranged with the connecting rod (810), and the limiting table (820) is used for supporting and limiting the connecting rod (810); A ball (830) is fixedly arranged at one end of the connecting rod (810) away from the cover body (430); The top of the brush (520) is provided with a guide plate (523), the other end of the guide plate (523) is lower than the front end of the guide plate (523) rotating towards the brush (520), the high 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.

2. A dust filtration system in flue gases according to claim 1, characterized in that: The upper end surface of the cover body (430) is conically arranged, the edge diameter of the cover body (430) is greater than the diameter of the vertical section of the guide pipe (410), the edge of the cover body (430) is vertically shielded above the filter screen (420), and the lower end surface of the cover body (430) is provided with a limiting groove (431); The end of the vertical section of the guide pipe (410) is also provided with a limiting ring (414), and the cover body (430) is fixedly connected with the guide pipe (410) by clamping the limiting groove (431) in the limiting ring (414).

3. A dust filtration system in flue gases according to claim 2, characterized in that: The vertical section of the guide pipe (410) is also provided with a supporting table (412), the supporting table (412) is arranged below the through hole (411), the upper end surface of the supporting table (412) is conically arranged, the lower end of the filter screen (420) is supported on the conical surface of the supporting table (412), the upper end of the filter screen (420) abuts against the lower end surface of the cover body (430), and the filter screen (420) and the cover body (430) are provided with a sealing gasket (413) therebetween.

4. A dust filtration system in flue gases according to claim 1, characterized in that: The impeller (620) is conically arranged, and the middle position of the impeller (620) is higher than the edge position of the impeller (620).

5. A dust filtration system in flue gases according to claim 1, characterized in that: The inside of the spray tower (100) is also provided with a flow guide assembly (700), and the flow guide assembly (700) comprises: A plurality of first flow guides (710) are fixedly arranged on the inner wall of the spray tower (100), and the first flow guides (710) are arranged above the impeller (620), the first flow guides (710) are arranged in a spiral shape, the rotation direction of the first flow guides (710) is consistent with the rotation direction of the impeller (620), and the first flow guides (710) guide the movement direction of the airflow in the spray tower (100) to a direction opposite to the fan blades (622). A second flow guide (720) corresponding to the first flow guide (710) is connected to one end of the first flow guide (710) at a low position, the other end of the second flow guide (720) is connected to one end of the adjacent first flow guide (710) at a high position, the second flow guide (720) is arranged in an arc shape, a plurality of second flow guides (720) form a narrowing at a position corresponding to the impeller (620), and the second flow guide (720) is used to guide the airflow in the spray tower (100) to an area close to the shaft center in the spray tower (100).

6. A dust filtration system in flue gases according to claim 1, characterized in that: A cyclone plate (730) is further arranged in the spray tower (100), the direction of the cyclone plate (730) is opposite to the direction of the fan blades (622) in the impeller (620), and the cyclone plate (730) is arranged above the spraying device (300).

7. A system for filtering dust from flue gas according to any one of claims 1-3, characterized in that: The support (510) comprises: A first support portion (511) is fixed at one end of the driving assembly (600) close to the filter screen (420); A second support portion (512) is fixedly arranged at one end of the driving assembly (600) away from the filter screen (420), and the other end of the second support portion (512) is 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) form a triangular support frame, and the brush (520) is fixedly arranged on one side of the first support portion (511) close to the filter screen (420); A clamping groove (521) is arranged on the brush (520), the first support portion (511) is clamped in the clamping groove (521), and a plurality of positioning holes (522) are arranged on the clamping groove (521) and the first support portion (511) in correspondence.

8. A system for filtering dust from flue gas according to any one of claims 1-3, characterized in that: The through hole (411) is arranged in an inclined manner, and the side of the through hole (411) close to the inner circumferential surface of the guide pipe (410) is higher than the side of the through hole (411) close to the outer circumferential surface of the guide pipe (410); The filter holes on the filter screen (420) are arranged in an inclined manner, 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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