Tail gas washing system for compound fertilizer production

Abstract

The invention relates to the technical field of tail gas treatment, and particularly discloses a tail gas washing system for compound fertilizer production, which comprises a first expanding pipe, a second expanding pipe and a cylindrical pipe, a nozzle is arranged on the first expanding pipe, a central pipe is arranged in the cylindrical pipe, an inner spiral fan group is arranged in the central pipe, and an outer spiral fan group is arranged between the cylindrical pipe and the central pipe. The first diameter-expanding pipe, the second diameter-expanding pipe and the cylindrical pipe form the shape of a Venturi pipe, the effect that the flow speed of tail gas is increased after the tail gas passes through the Venturi pipe is achieved, the inner spiral fan set and the outer spiral fan set form an inner spiral channel and an outer spiral channel, and therefore the tail gas flow rate is increased, and the tail gas flow rate is increased. The effect that the cyclone dust collector removes dust in tail gas is achieved, the confusion degree of the tail gas and the mixing degree of the tail gas and liquid drops are improved due to the opposite spiral directions, the screw pitches of the inner spiral fan set and the outer spiral fan set are synchronously adjusted through the adjusting assembly, and therefore the tail gas washing effect is adjusted.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas treatment, and in particular to a tail gas washing system for compound fertilizer production. Background Art

[0002] In the industrial process of compound fertilizer production, high-temperature reaction, drying, cooling and granulation processes will generate a large amount of tail gas containing ammonia, dust, sulfide and nitrogen oxides. Its composition is complex and has a pungent odor. If it is directly discharged without treatment, it will cause air pollution, form acid rain or haze, and at the same time cause waste of raw materials and increase the environmental protection costs of enterprises. Therefore, it is necessary to treat the tail gas generated in the production of compound fertilizer to reduce the impact on the environment and enterprises.

[0003] In the existing technology, the tail gas generated in the production of compound fertilizers is mostly firstly treated by using a tail gas washing system to remove pollutants. Common tail gas washing systems include cyclone dust collectors, venturi scrubbers, washing towers and circulating neutralization tanks. The cyclone dust collector is used to initially separate large particles of dust in the tail gas to reduce the subsequent processing load. The gas then enters the venturi scrubber and contacts the liquid through high-speed airflow to enhance the gas-liquid mixing efficiency. It is mainly used to absorb NH3 and part of SO2. The residual gas pollutants are further absorbed by the washing tower and gas-liquid separation is performed. Finally, the gas enters the circulating neutralization tank. The circulating neutralization tank can store and regenerate the washing liquid. The pH value is adjusted by adding alkaline or acidic substances to maintain the washing efficiency of the tail gas.

[0004] Regarding the above-mentioned related technologies, the cyclone dust collectors and venturi scrubbers used in the compound fertilizer production industry are generally large in size and require a large floor space. In addition, the specifications of the cyclone dust collectors and venturi scrubbers used in the compound fertilizer production industry are generally fixed, and the washing effect of the exhaust gas cannot be adjusted according to actual conditions, so improvements are made to this. Summary of the Invention

[0005] In order to reduce the overall volume of the cyclone dust collector and the venturi scrubber, and to adjust the exhaust gas washing effect according to actual conditions, the present application provides an exhaust gas washing system for compound fertilizer production.

[0006] This application provides an exhaust gas scrubbing system for compound fertilizer production, which adopts the following technical solution: 18. The exhaust gas scrubbing system for compound fertilizer production as claimed in claim 1, wherein the first and second expanded diameter tubes are symmetrically arranged at two ends of the cylindrical tube, and the first expanded diameter tube is arranged above the cylindrical tube, an air outlet bin is arranged above the first expanded diameter tube, an air outlet port is arranged on the air outlet bin, a fixing plate is arranged in the air outlet bin, and a plurality of nozzles are arranged on the fixing plate, an air inlet bin is arranged below the second expanded diameter tube, an air inlet port is arranged on the air inlet bin, a fixing frame is arranged in the air inlet bin, a central tube is fixedly arranged on the fixing frame, and the central tube is arranged in the cylindrical tube, an inner spiral fan group is arranged in the central tube, an outer spiral fan group is arranged between the cylindrical tube and the central tube, the spiral directions of the inner spiral fan group and the outer spiral fan group are opposite, and the cylindrical tube and the central tube are further provided with an adjustment mechanism for synchronously adjusting the pitch of the inner spiral fan group and the outer spiral fan group.

[0007] By adopting the above-mentioned technical solution, the first expanded diameter tube, the second expanded diameter tube and the cylindrical tube form the shape of a venturi tube, and the exhaust gas enters the second expanded diameter tube from the air inlet, and then enters the first expanded diameter tube through the cylindrical tube, thereby achieving the effect of increasing the flow velocity of the exhaust gas after passing through the venturi tube, and the present application arranges an inner spiral fan group and an outer spiral fan group in the cylindrical tube, forming multiple inner spiral channels and multiple outer spiral channels. The exhaust gas after the flow velocity is increased enters the inner spiral channel and the outer spiral channel to realize the spiral movement of the exhaust gas, thereby achieving the effect of the cyclone dust collector removing dust in the exhaust gas. The present application integrates the venturi tube and the cyclone dust collector into one, effectively reducing the floor space and overall volume required for the equipment.

[0008] The present application also makes the spiral directions of the inner spiral fan group and the outer spiral fan group opposite. When the exhaust gas passes through the spiral dust collector and enters the first expansion tube, the exhaust gas output from the inner spiral channel and the exhaust gas output from the outer spiral channel will collide with each other, increasing the degree of chaos of the exhaust gas movement in the first expansion tube, thereby increasing the degree of mixing of the exhaust gas and the droplets output from the nozzle, and further removing particulate impurities such as dust in the exhaust gas.

[0009] The adjustment component in the present application can also synchronously adjust the pitch of the inner spiral fan group and the outer spiral fan group, thereby increasing or decreasing the cross-sectional area of the inner spiral channel and the outer spiral channel. The reduction in cross-sectional area can further accelerate the flow rate of the exhaust gas in the channel, and vice versa. The synchronous adjustment of the pitch of the inner spiral fan group and the outer spiral fan group can also adjust the inclination angle of the inner spiral channel and the outer spiral channel. When the pitch decreases, the inclination angle decreases, and the shape of the spiral channel approaches a horizontal state, making the exhaust gas more turbulent, thereby adjusting the washing effect of the exhaust gas.

[0010] Optionally, the adjustment mechanism includes a first drive motor, a screw rod, a lifting disk and an adjustment assembly, the motor is arranged on the fixed frame, the screw rod is arranged on the output shaft of the first drive motor and is located in the center tube, the inner spiral fan group includes multiple groups of inner spiral fan blades, the outer spiral fan group includes multiple groups of outer spiral fan blades, the lifting disk is provided with multiple groups corresponding to the multiple groups of inner spiral fan blades and the multiple groups of outer spiral fan blades, and the multiple groups of lifting disks are threadedly connected and arranged on the screw rod, the screw rod is provided with multiple groups of threads corresponding to the multiple groups of lifting disks, and the pitch of the multiple groups of threads increases from top to bottom, the adjustment assembly is provided with multiple groups, and the multiple groups of adjustment assemblies are respectively arranged on the multiple groups of lifting disks, the adjustment assembly is used to limit the rotation of the lifting disk, and when the lifting disk is lifted and lowered on the screw rod, the lifting disk can lift and lower the inner spiral fan blades and the outer spiral fan blades and adjust the inclination angle of the inner spiral fan blades and the outer spiral fan blades.

[0011] By adopting the above technical solution, the first drive motor is started, and the output shaft of the first drive motor drives the lead screw to rotate. Under the action of the adjustment component to limit the rotation of the lifting plate, the rotation of the lead screw can drive the lifting plate to rise and fall on the lead screw. Since multiple sets of threads are provided on the lead screw corresponding to the multiple sets of lifting plates, and the pitches of the multiple sets of threads increase from top to bottom, it can be achieved that when the lead screw rotates, the lifting height of each lifting plate is different, and the closer to the lifting plate below, the greater the lifting amplitude, thereby achieving the synchronous increase and decrease of the distance between adjacent lifting plates, so that under the action of the adjustment component, the lifting plate can lift the inner spiral fan blades and the outer spiral fan blades, and adjust the inclination angles of the inner spiral fan blades and the outer spiral fan blades.

[0012] Optionally, the adjustment assembly includes a lifting rod, a partition plate and a ball bearing. The lifting rod is provided with multiple groups, and the central tube is provided with multiple groups of avoidance holes for the lifting rod to be lifted and lowered. One end of the multiple groups of lifting rods is respectively provided on the side walls of the multiple groups of lifting plates, and the ball bearing is provided at the end of the lifting rod away from the screw rod. A lifting groove is provided on the inner wall of the cylindrical tube, and the ball bearing is slidably provided in the lifting groove. The partition plate is provided with multiple groups corresponding to the multiple groups of avoidance holes, and the wall thickness of the central tube is provided with multiple groups of active cavities corresponding to the multiple groups of partition plates. The partition plate is provided on the lifting rod, and the lifting activity is provided in the active cavity. The two ends of the inner spiral fan blade and the outer spiral fan blade are respectively connected to the adjacent lifting rods.

[0013] By adopting the above technical solution, since the lifting rod is fixedly mounted on the lifting plate, the two ends of the inner spiral fan blade and the outer spiral fan blade are respectively connected to the adjacent lifting rods. Therefore, when the lifting plate drives the lifting rod to lift, the lifting and bending of the inner spiral fan blade and the outer spiral fan blade can be realized. Since the spacing between adjacent lifting plates increases and decreases synchronously, the spacing between adjacent inner spiral fan blades and outer spiral fan blades can be synchronously increased or decreased in the height direction, thereby realizing the increase or decrease of the cross-sectional area of the inner spiral channel and the outer spiral channel. The lifting and bending of the inner spiral fan blade and the outer spiral fan blade realizes the adjustment of the spiral inclination angle of the inner spiral fan blade and the outer spiral fan blade, thereby realizing the adjustment of the inclination angle of the inner spiral channel and the outer spiral channel, realizing the adjustment of the exhaust gas washing effect, and the ball reduces the friction between the lifting rod and the inner wall of the cylindrical tube, thereby reducing the load of the first drive motor.

[0014] Optionally, a water tank is provided below the air inlet bin, a water inlet is provided on the water tank, and a water inlet hole for spray water to enter the water tank is opened on the upper wall of the water tank, and a circulation mechanism for recycling the spray water is provided in the water tank.

[0015] By adopting the above-mentioned technical scheme, the water flow collected by the spray water can enter the second expansion pipe along the spiral channel, and then enter the water tank through the air inlet bin and the water inlet hole for recovery. The spray water can also flush the spiral channel to a certain extent in the spiral channel, reducing the impact of the accumulated dust due to long-term use of the spiral channel on the dust removal effect of the spiral channel. When the inner spiral blades and the outer spiral blades are bent, the adhesion strength of mud blocks and the like attached to the inner spiral blades and the outer spiral blades can also be reduced, causing them to loosen, further improving the flushing effect of the spray water, and when the surface of the inner spiral blades and the outer spiral blades are soaked with spray water, the adsorption effect of dust in the exhaust gas can also be improved, further improving the washing effect of the exhaust gas. The circulation mechanism in this application can realize the recycling of spray water and reduce the waste of water resources.

[0016] Optionally, the circulation mechanism includes a second drive motor, a rotating rod, rotating fan blades, a water outlet pipe, a water pump and a dredging assembly. The second drive motor is arranged above the water tank and is located in the air inlet bin. The rotating rod is arranged on the output shaft of the second drive motor and is rotatably arranged in the water tank. The rotating fan blades are symmetrically arranged in multiple groups, and multiple groups of rotating fan blades are all arranged on the rotating rod. A frustum is provided at the center position of the inner bottom wall of the water tank. One end of the water outlet pipe is connected to the upper surface of the frustum, and the other end is connected to the nozzle. The water pump is arranged on the water outlet pipe for extracting water from the water tank. The dredging assembly is arranged on the rotating rod for cleaning dust deposited in the water tank.

[0017] By adopting the above technical solution, the second drive motor is started, and the second drive motor drives the rotating blades on the rotating rod to rotate continuously and uniformly. The dust contained in the spray water in the water tank will gradually gather to the edge of the bottom wall of the water tank. At this time, the spray water in the middle of the water tank is relatively clear. The water pump is started, and the water pump draws out the clearer spray water above the frustum through the outlet pipe and transports it to the nozzle for secondary utilization. The curved surface of the frustum can also reduce the accumulation of dust in the middle of the bottom wall of the water tank, thereby facilitating the dredging component to clean the settled dust.

[0018] Optionally, the dredging assembly includes a ratchet, a pawl, a rotating disk, a rotating column, a dredging rod and a collecting bin, wherein the rotating column is provided with multiple groups, and the multiple groups of rotating columns are spaced and rotatably arranged on the upper surface of the frustum with the center of the cone as the rotation center, the rotating disk is fixedly arranged on the end of the rotating column away from the cone, the dredging rod is fixedly arranged on the side wall of the rotating column, the ratchet is arranged on the rotating disk, and the pawl is arranged on the end of the rotating rod away from the second driving motor. When the rotating rod rotates counterclockwise, the ratchet and the pawl engage with each other to drive the dredging rods on the multiple groups of rotating rods to rotate, thereby cleaning the dust deposited in the water tank, and the collecting bin is arranged below the water tank, and a strip hole is opened on the inner bottom wall of the water tank, and the collecting bin is connected with the inside of the water tank through the strip hole, and a water outlet is provided on the collecting bin.

[0019] By adopting the above technical solution, when the rotating rod rotates clockwise, the ratchet and the pawl are not engaged, and at this time only the spray water is stirred by the rotating fan blades. When the rotating rod rotates counterclockwise, the ratchet and the pawl are engaged, and the rotating rod rotates, driving the rotating disk and the ratchet to rotate synchronously, thereby realizing the synchronous rotation of the rotating column and the dredging rod fixedly connected to the rotating column. When the dredging rod rotates, the inner bottom wall of the water tank can be cleaned, and the dust deposited at the bottom can be cleaned into the collection bin through the strip holes and discharged and recovered through the water outlet.

[0020] Optionally, a filter barrel is fixedly provided on the frustum, and a brush is provided on the side of the rotating column away from the dredging rod. When the rotating column rotates, the brush cleans the filter barrel.

[0021] By adopting the above technical solution, when the rotating column rotates, the brush can continuously dump the filter barrel, thereby preventing the filter barrel from being blocked and reducing the output efficiency of the water pump for spraying water.

[0022] Optionally, a connecting pipe is provided on the fixing plate, and an end of the connecting pipe away from the fixing plate is provided at the same height as an end of the first expanding tube close to the air outlet.

[0023] By adopting the above technical solution, since the cross-sectional diameter of the first expanded tube gradually increases, the pressure of the exhaust gas decreases after entering the first expanded tube and the exhaust gas will diffuse toward the inner wall of the first expanded tube, and the air pressure in the center of the first expanded tube decreases. Therefore, the end of the connecting tube away from the fixed plate is set at the same height as the end of the first expanded tube close to the air outlet, so that the exhaust gas can form a circuitous airflow path under the fixed plate, thereby further improving the mixing effect of the exhaust gas and the spray water.

[0024] Optionally, a light source and a light sensor are provided on the frustum, and the light source and the light sensor are spaced apart and arranged in the filter barrel.

[0025] By adopting the above technical solution, the light emitted by the light source is received by the light sensor. When the water in the middle of the water tank gradually becomes turbid, the light intensity received by the light sensor will decrease. When it decreases to a preset value, it can be judged based on the signal output of the light sensor that the spray water in the water tank needs to be replaced. When replacement is required, the water outlet is opened to discharge the original spray water in the water tank, and then the water outlet is closed and water is added to the water tank through the water inlet.

[0026] Optionally, a protective cover for protecting the first drive motor and the second drive motor is provided between the fixing frame and the water tank.

[0027] By adopting the above technical solution, the protective cover can prevent the first drive motor and the second drive motor from directly contacting the spray water, thereby extending the service life of the first drive motor and the second drive motor.

[0028] In summary, this application includes at least one of the following beneficial technical effects: 1. The first expanded diameter tube, the second expanded diameter tube, and the cylindrical tube form a venturi shape. The exhaust gas enters the second expanded diameter tube from the air inlet, and then enters the first expanded diameter tube through the cylindrical tube, thereby achieving an effect of increasing the flow rate of the exhaust gas after passing through the venturi. In addition, the present application provides an inner spiral fan group and an outer spiral fan group in the cylindrical tube, forming multiple inner spiral channels and multiple outer spiral channels. The exhaust gas with increased flow rate enters the inner spiral channels and the outer spiral channels to achieve spiral motion of the exhaust gas, thereby achieving the effect of the cyclone dust collector removing dust from the exhaust gas. The present application integrates the venturi and the cyclone dust collector into one, effectively reducing the floor space and overall volume required for the equipment. 2. The present invention also makes the spiral directions of the inner and outer spiral fan groups opposite. When the exhaust gas passes through the spiral dust collector and enters the first expanded diameter tube, the exhaust gas output from the inner spiral channel and the exhaust gas output from the outer spiral channel will collide with each other, increasing the degree of chaos of the exhaust gas movement in the first expanded diameter tube, thereby improving the degree of mixing of the exhaust gas and the droplets output by the nozzle, and further removing dust and other particulate impurities in the exhaust gas; 3. The adjustment assembly of the present application can also synchronously adjust the pitch of the inner and outer spiral fan groups, thereby increasing or decreasing the cross-sectional area of the inner and outer spiral channels. Reducing the cross-sectional area can further accelerate the flow rate of the exhaust gas in the channel, and vice versa. Synchronous adjustment of the pitch of the inner and outer spiral fan groups can also adjust the inclination angle of the inner and outer spiral channels. Reducing the pitch reduces the inclination angle, and the shape of the spiral channel approaches a horizontal state, making the exhaust gas more turbulent, thereby adjusting the exhaust gas scrubbing effect. 4. The water flow collected by the spray water can enter the second expanded diameter pipe along the spiral channel, and then enter the water storage tank through the air inlet bin and the water inlet hole for recovery. The spray water can also flush the spiral channel to a certain extent, reducing the impact of the dust accumulated in the spiral channel due to long-term use of the spiral channel on the dust removal effect of the spiral channel. When the inner spiral blades and the outer spiral blades are bent, the adhesion strength of mud blocks and the like attached to the inner spiral blades and the outer spiral blades can be reduced, causing them to loosen, further improving the flushing effect of the spray water. When the surfaces of the inner spiral blades and the outer spiral blades are soaked with spray water, the adsorption effect of dust in the exhaust gas can be improved, further improving the washing effect of the exhaust gas. The circulation mechanism in this application can realize the recycling of spray water and reduce the waste of water resources. 5. Start the second drive motor, which drives the rotating blades on the rotating rod to rotate continuously and uniformly. The dust contained in the spray water in the water tank will gradually gather at the edge of the bottom wall of the water tank. At this time, the spray water in the middle of the water tank is relatively clear. Start the water pump, which pumps the relatively clear spray water above the frustum through the outlet pipe and transports it to the nozzle for secondary use. The curved surface of the frustum can also reduce the accumulation of dust in the middle of the bottom wall of the water tank, making it easier for the silt removal component to clean up the settled dust. 6. As the cross-sectional diameter of the first expanded tube gradually increases, the pressure of the exhaust gas decreases after entering the first expanded tube, and the exhaust gas will diffuse toward the inner wall of the first expanded tube, and the air pressure in the center of the first expanded tube decreases. Therefore, the end of the connecting tube away from the fixed plate is arranged at the same height as the end of the first expanded tube close to the air outlet, so that the exhaust gas can form a circuitous airflow path under the fixed plate, thereby further improving the mixing effect of the exhaust gas and the spray water. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 yes Figure 1 Schematic diagram of the cross-section structure; Figure 3 yes Figure 2 Schematic diagram of part of the structure; Figure 4 yes Figure 2 A schematic diagram of the enlarged structure of part A; Figure 5 It is a schematic diagram of the structure of the ratchet and pawl.

[0031] Figure numerals: 1. First expansion tube; 11. Air outlet chamber; 12. Air outlet; 13. Fixed plate; 14. Nozzle; 2. Second expansion tube; 21. Air inlet chamber; 22. Air inlet; 3. Cylindrical tube; 31. Center tube; 4. Adjustment assembly; 41. First drive motor; 42. Screw; 43. Lifting plate; 44. Adjustment assembly; 441. Lifting rod; 442. Partition plate; 443. Ball bearing; 45. Inner spiral blade; 46. Outer spiral blade; 5. Water tank ;51. Water inlet;6. Circulation mechanism;61. Second drive motor;62. Rotating rod;63. Rotating fan blades;64. Water outlet pipe;65. Water pump;66. Dredging assembly;661. Ratchet;662. Pawl;663. Rotating disk;664. Rotating column;665. Dredging rod;666. Collecting bin;667. Strip hole;668. Water outlet;67. Cone;7. Filter barrel;8. Connecting pipe;9. Light source;91. Photo sensor;10. Protective cover. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-5 This application is described in further detail.

[0033] The present application discloses an exhaust gas scrubbing system for compound fertilizer production, referring to Figure 1 and Figure 2The flask 3 has two opposite ends, and the flask 3 has two opposite ends, and the flask 3 has two opposite ends.

[0034] The first expanded diameter tube 1, the second expanded diameter tube 2 and the cylindrical tube 3 form the shape of a venturi tube. The exhaust gas enters the second expanded diameter tube 2 from the air inlet 22, and then enters the first expanded diameter tube 1 through the cylindrical tube 3, thereby achieving the effect of increasing the flow velocity of the exhaust gas after passing through the venturi tube. In addition, in this embodiment, an inner spiral fan group and an outer spiral fan group are arranged in the cylindrical tube 3, forming multiple inner spiral channels and multiple outer spiral channels. The exhaust gas after the flow velocity is increased enters the inner spiral channel and the outer spiral channel to realize the spiral movement of the exhaust gas, thereby achieving the effect of the cyclone dust collector removing dust in the exhaust gas. In this embodiment, the venturi tube and the cyclone dust collector are integrated into one, effectively reducing the floor space and overall volume required for the equipment.

[0035] This embodiment also makes the spiral directions of the inner spiral fan group and the outer spiral fan group opposite. When the exhaust gas passes through the spiral dust collector and enters the first expansion tube 1, the exhaust gas output from the inner spiral channel and the exhaust gas output from the outer spiral channel will collide with each other, increasing the degree of chaos of the exhaust gas movement in the first expansion tube 1, thereby increasing the degree of mixing of the exhaust gas and the droplets output from the nozzle 14, and further removing particulate impurities such as dust in the exhaust gas.

[0036] The adjustment component 4 in this embodiment can also synchronously adjust the pitch of the inner spiral fan group and the outer spiral fan group, thereby increasing or decreasing the cross-sectional area of the inner spiral channel and the outer spiral channel. The reduction in cross-sectional area can further accelerate the flow rate of the exhaust gas in the channel, and vice versa. The synchronous adjustment of the pitch of the inner spiral fan group and the outer spiral fan group can also adjust the inclination angle of the inner spiral channel and the outer spiral channel. When the pitch decreases, the inclination angle decreases, and the shape of the spiral channel approaches a horizontal state, making the exhaust gas more turbulent, thereby adjusting the washing effect of the exhaust gas.

[0037] In this embodiment, there are three inner spiral fan groups and three outer spiral fan groups, and they are all arranged evenly at intervals around the circumference. It is a preferred method of this embodiment that there are three inner spiral fan groups and three outer spiral fan groups. In other embodiments, it can be adjusted according to actual usage requirements.

[0038] Reference Figure 2 A connecting pipe 8 is provided on the fixed plate 13. The end of the connecting pipe 8 away from the fixed plate 13 is arranged at the same height as the end of the first expanded tube 1 near the air outlet 12. As the cross-sectional diameter of the first expanded tube 1 gradually increases, the pressure of the exhaust gas decreases after entering the first expanded tube 1, causing it to diffuse toward the inner wall of the first expanded tube 1, reducing the air pressure at the center of the first expanded tube 1. Therefore, the end of the connecting pipe 8 away from the fixed plate 13 is arranged at the same height as the end of the first expanded tube 1 near the air outlet 12, allowing the exhaust gas to form a circuitous airflow path below the fixed plate 13, thereby further improving the mixing effect of the exhaust gas and the spray water.

[0039] In order to adjust the inner and outer spiral channels, refer to Figure 2 、 Figure 3 and Figure 4 The adjustment mechanism in this embodiment includes a first drive motor 41, a screw rod 42, a lifting disk 43 and an adjustment component 4. The motor is fixedly mounted on the fixed frame. The screw rod 42 is welded to the output shaft of the first drive motor 41 and is located in the center tube 31. The inner spiral fan group includes multiple groups of inner spiral blades 45, and the outer spiral fan group includes multiple groups of outer spiral blades 46. The lifting disk 43 is provided with multiple groups corresponding to the multiple groups of inner spiral blades 45 and the multiple groups of outer spiral blades 46, and the multiple groups of lifting disks 43 are all threadedly connected and mounted on the screw rod 42. Multiple groups of threads are opened on the screw rod 42 corresponding to the multiple groups of lifting disks 43, and the pitch of the multiple groups of threads increases from top to bottom. The adjustment component 4 is provided with multiple groups, and the multiple groups of adjustment components 4 are respectively mounted on the multiple groups of lifting disks 43. A margin spacing is set between the outer spiral blades 46 and the inner wall of the cylindrical tube 3, and between the inner spiral blades 45 and the inner wall of the center tube 31.

[0040] The first drive motor 41 is started, and the output shaft of the first drive motor 41 drives the screw rod 42 to rotate. Under the action of the adjustment component 4 to limit the rotation of the lifting plate 43, the rotation of the screw rod 42 can drive the lifting plate 43 to rise and fall on the screw rod 42. Since multiple sets of threads are provided on the screw rod 42 corresponding to the multiple sets of lifting plates 43, and the pitch of the multiple sets of threads increases from top to bottom, it can be achieved that when the screw rod 42 rotates, the lifting height of each lifting plate 43 is different, and the closer to the lower lifting plate 43, the greater the lifting amplitude, thereby achieving the synchronous increase and decrease of the distance between adjacent lifting plates 43, so that under the action of the adjustment component 4, the lifting plate 43 can lift the inner spiral fan blades 45 and the outer spiral fan blades 46, and adjust the inclination angles of the inner spiral fan blades 45 and the outer spiral fan blades 46.

[0041] Reference Figure 2 、 Figure 3 and Figure 4 The adjustment assembly 4 in this embodiment includes a lifting rod 441, a partition plate 442 and a ball 443. The lifting rod 441 is provided with multiple groups, and the central tube 31 is provided with multiple groups of avoidance holes for the lifting rod 441 to lift and lower. One end of the multiple groups of lifting rods 441 is respectively welded and installed on the side walls of the multiple groups of lifting disks 43, and the ball 443 is rotatably installed on the end of the lifting rod 441 away from the screw rod 42. A lifting groove is provided on the inner wall of the cylindrical tube 3, and the ball 443 is slidably installed in the lifting groove. The partition plate 442 is provided with multiple groups corresponding to the multiple groups of avoidance holes, and the wall thickness of the central tube 31 is provided with multiple groups of active cavities corresponding to the multiple groups of partition plates 442. The partition plate 442 is welded and installed on the lifting rod 441, and the lifting and lowering activities are installed in the active cavity. The two ends of the inner spiral fan blade 45 and the outer spiral fan blade 46 are respectively welded to the adjacent lifting rod 441.

[0042] Since the lifting rod 441 is fixedly mounted on the lifting plate 43, the two ends of the inner spiral fan blade 45 and the outer spiral fan blade 46 are respectively connected to the adjacent lifting rods 441. Therefore, when the lifting plate 43 drives the lifting rod 441 to lift and lower, the lifting and bending of the inner spiral fan blade 45 and the outer spiral fan blade 46 can be realized. Due to the synchronous increase and decrease of the spacing between adjacent lifting plates 43, the spacing between adjacent inner spiral fan blades 45 and outer spiral fan blades 46 can be synchronously increased or decreased in the height direction, thereby increasing or decreasing the cross-sectional area of the inner spiral channel and the outer spiral channel. The lifting and bending of the inner spiral fan blade 45 and the outer spiral fan blade 46 realizes the adjustment of the spiral inclination angle of the inner spiral fan blade 45 and the outer spiral fan blade 46, thereby adjusting the inclination angle of the inner spiral channel and the outer spiral channel, and adjusting the exhaust gas washing effect. The ball 443 reduces the friction between the lifting rod 441 and the inner wall of the cylindrical tube 3, thereby reducing the load of the first drive motor 41.

[0043] Reference Figure 1 and Figure 2A water tank 5 is welded and installed below the air inlet warehouse 21, a water inlet 51 is welded and installed on the water tank 5, and a water inlet hole is opened on the upper wall of the water tank 5, and a circulation mechanism 6 is set in the water tank 5. The water flow collected by the spray water can enter the second expansion pipe 2 along the spiral channel, and then enter the water storage tank 5 through the air inlet bin 21 and the water inlet hole for recovery. The spray water can also flush the spiral channel to a certain extent in the spiral channel, reducing the impact of the accumulated dust on the dust removal effect of the spiral channel due to long-term use of the spiral channel. When the inner spiral blades 45 and the outer spiral blades 46 are bent, the adhesion strength of mud blocks and the like attached to the inner spiral blades 45 and the outer spiral blades 46 can also be reduced, causing them to loosen, further improving the flushing effect of the spray water, and when the surfaces of the inner spiral blades 45 and the outer spiral blades 46 are soaked with spray water, the adsorption effect of dust in the exhaust gas can also be improved, further improving the washing effect of the exhaust gas. The circulation mechanism 6 in this embodiment can realize the recycling of spray water and reduce the waste of water resources.

[0044] Reference Figure 2 The circulation mechanism 6 in this embodiment includes a second drive motor 61, a rotating rod 62, rotating blades 63, a water outlet pipe 64, a water pump 65 and a dredging assembly 66. The second drive motor 61 is fixedly installed above the water tank 5 and is located in the air inlet bin 21. The rotating rod 62 is welded on the output shaft of the second drive motor 61 and is rotatably installed in the water tank 5. The rotating blades 63 are symmetrically arranged in multiple groups, and the multiple groups of rotating blades 63 are welded on the rotating rod 62. A frustum 67 is welded on the center position of the inner bottom wall of the water tank 5. One end of the water outlet pipe 64 is connected to the upper surface of the frustum 67, and the other end is connected to the nozzle 14. The water pump 65 is fixedly installed on the water outlet pipe 64, and the dredging assembly 66 is installed on the rotating rod 62.

[0045] Start the second drive motor 61, and the second drive motor 61 drives the rotating fan blades 63 on the rotating rod 62 to rotate continuously at a uniform speed. The dust contained in the spray water in the water tank 5 will gradually gather to the edge of the bottom wall of the water tank 5. At this time, the spray water in the middle of the water tank 5 is relatively clear. Start the water pump 65, and the water pump 65 extracts the relatively clear spray water above the cone 67 through the outlet pipe 64 and transports it to the nozzle 14 for secondary utilization. The curved surface of the cone 67 can also reduce the accumulation of dust in the middle of the bottom wall of the water tank 5, thereby facilitating the dredging component 66 to clean the settled dust.

[0046] A protective cover 10 is also welded between the fixing frame and the water storage tank 5. The protective cover 10 can prevent the first drive motor 41 and the second drive motor 61 from directly contacting the spray water, thereby extending the service life of the first drive motor 41 and the second drive motor 61.

[0047] Reference Figure 2 and Figure 5The dredging assembly 66 in this embodiment includes a ratchet 661, a pawl 662, a rotating disk 663, a rotating column 664, a dredging rod 665 and a collecting bin 666. The rotating column 664 is provided with multiple groups, and the multiple groups of rotating columns 664 are rotatably mounted on the upper surface of the frustum 67 with the center of the cone 67 as the rotation center. The rotating disk 663 is fixedly welded and mounted on the end of the rotating column 664 away from the cone 67. The dredging rod 665 is fixedly welded and mounted on the side wall of the rotating column 664. The outer wall of the ratchet 661 is welded and mounted on the rotating disk 663. The pawl 662 is rotatably mounted on the end of the rotating rod 62 away from the second drive motor 61. The collecting bin 666 is welded and mounted under the water tank 5. A strip hole 667 is opened on the inner bottom wall of the water tank 5. The collecting bin 666 is connected to the inside of the water tank 5 through the strip hole 667. A water outlet 668 is welded on the collecting bin 666.

[0048] When the rotating rod 62 rotates clockwise, the ratchet 661 and the pawl 662 are not engaged. At this time, only the spray water is stirred by the rotating fan blade 63. When the rotating rod 62 rotates counterclockwise, the ratchet 661 and the pawl 662 are engaged. When the rotating rod 62 rotates, it drives the rotating disk 663 and the ratchet 661 to rotate synchronously, thereby realizing the synchronous rotation of the rotating column 664 and the silt cleaning rod 665 fixedly connected to the rotating column 664. When the silt cleaning rod 665 rotates, the inner bottom wall of the water tank 5 can be cleaned, and the dust deposited at the bottom can be cleaned into the collection bin 666 through the strip hole 667 and discharged and recovered through the water outlet 668.

[0049] Reference Figure 2 A filter barrel 7 is fixedly mounted on the cone 67, and a brush is mounted on the side of the rotating column 664 away from the silt removal rod 665. A light source 9 and a light sensor 91 are mounted on the cone 67, and the light source 9 and the light sensor 91 are spaced apart in the filter barrel 7. When the rotating column 664 rotates, the brush can continuously dump the filter barrel 7 to prevent the filter barrel 7 from being blocked and reducing the output efficiency of the water pump 65 for spraying water. The light source 9 emits light and is received by the light sensor 91. When the water in the middle of the water tank 5 gradually becomes turbid, the light intensity received by the light sensor 91 will decrease. When it decreases to a preset value, it can be determined based on the signal output of the light sensor 91 that the spray water in the water tank 5 needs to be replaced. When replacement is required, the water outlet 668 is opened to discharge the original spray water in the water tank 5, and then the water outlet 668 is closed and water is added to the water tank 5 through the water inlet 51.

[0050] The implementation principle of the tail gas scrubbing system for compound fertilizer production in the embodiment of the present application is as follows: When it is necessary to reduce the overall volume and floor space of the device, the first expanding tube 1, the second expanding tube 2 and the cylindrical tube 3 form the shape of a venturi tube, and the exhaust gas enters the second expanding tube 2 from the air inlet 22, and then enters the first expanding tube 1 through the cylindrical tube 3, thereby achieving the effect of increasing the flow rate of the exhaust gas after passing through the venturi tube, and in this embodiment, an inner spiral fan group and an outer spiral fan group are arranged in the cylindrical tube 3, forming a plurality of inner spiral channels and a plurality of outer spiral channels, and the exhaust gas after the flow rate is increased enters the inner spiral channel and the outer spiral channel to realize the spiral movement of the exhaust gas, thereby achieving the effect of the cyclone dust collector removing dust in the exhaust gas, integrating the venturi tube and the cyclone dust collector into one, effectively reducing the floor space and overall volume required for the equipment.

[0051] When it is necessary to adjust the spacing and spiral inclination of the inner spiral blades 45 and the outer spiral blades 46, so as to adjust the exhaust gas washing effect according to actual usage requirements, the first drive motor 41 is started, and the output shaft of the first drive motor 41 drives the screw rod 42 to rotate. The rotation of the screw rod 42 can drive the lifting plate 43 to rise and fall on the screw rod 42. Since the screw rod 42 has multiple sets of threads corresponding to the multiple sets of lifting plates 43, and the pitch of the multiple sets of threads increases from top to bottom, it can be achieved that when the screw rod 42 rotates, the lifting height of each lifting plate 43 is different, and the closer to the lower lifting plate 43, the greater the lifting amplitude, thereby achieving the synchronous increase and decrease of the spacing between adjacent lifting plates 43. Since the lifting rod 441 is fixedly mounted on the lifting plate 43, the two ends of the inner spiral blade 45 and the outer spiral blade 46 are respectively connected to the adjacent lifting rod 441. Therefore, when the lifting plate 43 drives the lifting rod 441 to rise and fall, the inner spiral blade 45 and the outer spiral blade 46 can be lifted and lowered and bent.

[0052] Due to the synchronous increase or decrease in the spacing between adjacent lifting plates 43, the spacing between adjacent inner spiral blades 45 and outer spiral blades 46 can be synchronously increased or decreased in the height direction, thereby increasing or decreasing the cross-sectional area of the inner spiral channel and the outer spiral channel. The bending of the lifting and lowering of the inner spiral blades 45 and the outer spiral blades 46 adjusts the spiral inclination angles of the inner spiral blades 45 and the outer spiral blades 46, thereby adjusting the inclination angles of the inner spiral channel and the outer spiral channel.

[0053] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words “first”, “second”, “third” and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as “a” or “an” and the like do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as “include” or “comprise” and the like mean that the elements or objects appearing before “include” or “comprises” cover the elements or objects listed after “include” or “comprises” and their equivalents, and do not exclude other elements or objects. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

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

Claims

1. A tail gas scrubbing system for compound fertilizer production, characterized by: The invention comprises a first expanding tube (1), a second expanding tube (2) and a cylindrical tube (3), wherein the first expanding tube (1) and the second expanding tube (2) are symmetrically arranged at the two ends of the cylindrical tube (3), and the first expanding tube (1) is arranged above the cylindrical tube (3); an air outlet bin (11) is arranged above the first expanding tube (1), an air outlet port (12) is arranged on the air outlet bin (11), a fixing plate (13) is arranged in the air outlet bin (11), and a plurality of nozzles (14) are arranged on the fixing plate (13); an air inlet bin (21) is arranged below the second expanding tube (2), and the air outlet bin (12) is provided on the air outlet bin (11). An air inlet (22) is provided on the air inlet bin (21), a fixing frame is provided in the air inlet bin (21), a center tube (31) is fixedly provided on the fixing frame, and the center tube (31) is provided in the cylindrical tube (3), an inner spiral fan group is provided in the center tube (31), an outer spiral fan group is provided between the cylindrical tube (3) and the center tube (31), the spiral directions of the inner spiral fan group and the outer spiral fan group are opposite, and the cylindrical tube (3) and the center tube (31) are further provided with an adjustment mechanism for synchronously adjusting the pitch of the inner spiral fan group and the outer spiral fan group.

2. The tail gas scrubbing system for compound fertilizer production according to claim 1, characterized in that: The adjustment mechanism includes a first drive motor (41), a screw rod (42), a lifting disk (43) and an adjustment component (4), wherein the motor is arranged on the fixed frame, the screw rod (42) is arranged on the output shaft of the first drive motor (41) and is located in the central tube (31), the inner spiral fan group includes multiple groups of inner spiral blades (45), the outer spiral fan group includes multiple groups of outer spiral blades (46), the lifting disk (43) is provided with multiple groups corresponding to the multiple groups of inner spiral blades (45) and the multiple groups of outer spiral blades (46), and the multiple groups of lifting disks (43) are all threadedly connected to the screw rod (42), the The screw rod (42) is provided with multiple sets of threads corresponding to the multiple sets of lifting disks (43), and the pitches of the multiple sets of threads increase from top to bottom. The adjustment components (4) are provided with multiple sets, and the multiple sets of adjustment components (4) are respectively provided on the multiple sets of lifting disks (43). The adjustment components (4) are used to limit the rotation of the lifting disk (43), and when the lifting disk (43) is lifted and lowered on the screw rod (42), the lifting disk (43) can lift and lower the inner spiral fan blades (45) and the outer spiral fan blades (46) and adjust the inclination angles of the inner spiral fan blades (45) and the outer spiral fan blades (46).

3. The tail gas scrubbing system for compound fertilizer production according to claim 2, characterized in that: The adjustment assembly (4) includes a lifting rod (441), a partition plate (442) and a ball (443). The lifting rod (441) is provided with multiple groups. The central tube (31) is provided with multiple groups of avoidance holes for the lifting rod (441). One end of the multiple groups of lifting rods (441) is respectively provided on the side walls of the multiple groups of lifting plates (43). The ball (443) is provided at the end of the lifting rod (441) away from the screw rod (42). The inner wall of the cylindrical tube (3) is provided with a hole. A lifting groove is provided, the ball (443) is slidably arranged in the lifting groove, the partition plate (442) is provided with multiple groups corresponding to the multiple groups of avoidance holes, and multiple groups of movable cavities are opened in the wall thickness of the central tube (31) corresponding to the multiple groups of the partition plates (442). The partition plate (442) is arranged on the lifting rod (441), and the lifting movement is arranged in the movable cavity. The two ends of the inner spiral fan blade (45) and the outer spiral fan blade (46) are respectively connected to the adjacent lifting rod (441).

4. The tail gas scrubbing system for compound fertilizer production according to claim 2, characterized in that: A water storage tank (5) is provided below the air inlet bin (21), a water inlet (51) is provided on the water storage tank (5), and a water inlet hole for spray water to enter the water storage tank (5) is provided on the upper wall of the water storage tank (5), and a circulation mechanism (6) for recycling the spray water is provided in the water storage tank (5).

5. The tail gas scrubbing system for compound fertilizer production according to claim 4, characterized in that: The circulation mechanism (6) includes a second drive motor (61), a rotating rod (62), rotating blades (63), a water outlet pipe (64), a water pump (65) and a dredging assembly (66). The second drive motor (61) is arranged above the water storage tank (5) and is located in the air inlet bin (21). The rotating rod (62) is arranged on the output shaft of the second drive motor (61) and is rotatably arranged in the water storage tank (5). The rotating blades (63) are symmetrically arranged in multiple groups. The leaves (63) are all arranged on the rotating rod (62), a frustum (67) is arranged at the center position of the inner bottom wall of the water storage tank (5), one end of the water outlet pipe (64) is connected to the upper surface of the frustum (67), and the other end is connected to the nozzle (14), the water pump (65) is arranged on the water outlet pipe (64) for extracting water from the water storage tank (5), and the silt removal component (66) is arranged on the rotating rod (62) for cleaning the dust deposited in the water storage tank (5).

6. The tail gas scrubbing system for compound fertilizer production according to claim 5, characterized in that: The dredging assembly (66) includes a ratchet (661), a pawl (662), a rotating disk (663), a rotating column (664), a dredging rod (665) and a collecting bin (666). The rotating columns (664) are provided in multiple groups. The multiple groups of rotating columns (664) are spaced and rotatably arranged on the upper surface of the frustum (67) with the center of the frustum (67) as the rotation center. The rotating disk (663) is fixedly arranged at the end of the rotating column (664) away from the frustum (67). The dredging rod (665) is fixedly arranged on the side wall of the rotating column (664). The ratchet (661) is arranged on the rotating disk (663). The pawl (662) is arranged at the end of the rotating rod (62) away from the second drive motor (61). When the rotating rod (62) rotates counterclockwise, the ratchet (661) and the pawl (662) engage with each other to drive multiple groups of silt removal rods (665) on the rotating rod (62) to rotate, thereby cleaning the dust deposited in the water tank (5). The collecting bin (666) is arranged below the water tank (5). A strip hole (667) is opened on the inner bottom wall of the water tank (5). The collecting bin (666) is connected to the inside of the water tank (5) through the strip hole (667). A water outlet (668) is provided on the collecting bin (666).

7. The tail gas scrubbing system for compound fertilizer production according to claim 5, characterized in that: A filter barrel (7) is fixedly provided on the frustum (67), and a brush is provided on the side of the rotating column (664) away from the silt clearing rod (665). When the rotating column (664) rotates, the brush cleans the filter barrel (7).

8. The tail gas scrubbing system for compound fertilizer production according to claim 1, characterized in that: A connecting pipe (8) is provided on the fixed plate (13), and an end of the connecting pipe (8) away from the fixed plate (13) is arranged at the same height as the end of the first expanding tube (1) close to the air outlet (12).

9. The tail gas scrubbing system for compound fertilizer production according to claim 7, characterized in that: A light source (9) and a light sensor (91) are provided on the frustum (67), and the light source (9) and the light sensor (91) are spaced apart and arranged inside the filter barrel (7).

10. The tail gas scrubbing system for compound fertilizer production according to claim 5, characterized in that: A protective cover (10) for protecting the first drive motor (41) and the second drive motor (61) is provided between the fixing frame and the water tank (5).

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