Tail gas washing system for compound fertilizer production

Abstract

The application relates to the tail gas treatment technical field, and particularly discloses a tail gas washing system for compound fertilizer production, which comprises a first diameter expansion pipe, a second diameter expansion pipe and a cylindrical pipe, the first diameter expansion pipe is provided with a nozzle, the cylindrical pipe is internally provided with a center pipe, the center pipe is internally provided with an inner spiral fan group, the cylindrical pipe and the center pipe are provided with an outer spiral fan group, the spiral directions of the inner spiral fan group and the outer spiral fan group are opposite, the cylindrical pipe and the center pipe are further provided with an adjusting mechanism, the first diameter expansion pipe, the second diameter expansion pipe and the cylindrical pipe in the application form the shape of a textil pipe, the effect that the flow velocity of tail gas is increased after the tail gas passes through the textil pipe is realized, the inner spiral fan group and the outer spiral fan group form inner and outer spiral channels, the effect that the dust in the tail gas is removed by a cyclone dust collector is realized, the spiral directions are opposite, the mixing degree of the tail gas and the degree of confusion of the tail gas are increased, and the pitch of the inner spiral fan group and the outer spiral fan group is synchronously adjusted by the adjusting assembly, so that the washing effect of the tail gas is adjusted.

Description

TECHNICAL FIELD

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

[0002] In the compound fertilizer production industry process, a large amount of tail gas containing ammonia, dust, sulfide and nitrogen oxide is generated in the process links of high-temperature reaction, drying, cooling and granulation, the tail gas has complex components and irritating odor, if directly discharged without treatment, air pollution will be caused, acid rain or haze will be formed, meanwhile, raw material waste is caused and enterprise environmental protection cost is increased, therefore, the tail gas generated in the production of compound fertilizer needs to be treated to reduce the influence on the environment and enterprises.

[0003] In the prior art, the tail gas generated in the production of compound fertilizer is mostly removed by using a tail gas washing system, the common tail gas washing system comprises a cyclone dust collector, a Venturi scrubber, a washing tower and a circulating neutralization tank, the cyclone dust collector is used for preliminarily separating large-particle dust in the tail gas to reduce the subsequent treatment load, then the gas enters the Venturi scrubber, the gas is contacted with liquid through high-speed airflow to enhance the gas-liquid mixing efficiency, the Venturi scrubber is mainly used for absorbing NH3 and part of SO2, then the residual gas pollutants are further absorbed through the washing tower, and gas-liquid separation is carried out, finally, the tail gas enters the circulating neutralization tank, the circulating neutralization tank can store and regenerate the washing liquid, by adding alkaline substances or acidic substances to adjust the pH value, the washing efficiency on the tail gas is maintained.

[0004] For the related technology in the above, the cyclone dust collector and the Venturi scrubber used in the compound fertilizer production industry generally have a large size, a large floor area is needed, and the specifications of the cyclone dust collector and the Venturi scrubber used in the compound fertilizer production industry are certain, the washing effect of the tail gas cannot be adjusted according to the actual situation, therefore, improvement is needed. SUMMARY

[0005] In order to reduce the overall size of the cyclone dust collector and the Venturi scrubber and adjust the washing effect of the tail gas according to the actual situation, the application provides a tail gas washing system for compound fertilizer production.

[0006] The tail gas washing system for compound fertilizer production provided by the application adopts the following technical scheme:

[0007] The utility model provides a tail gas washing system for compound fertilizer production, including first expansion pipe, second expansion pipe and cylindrical pipe, first expansion pipe and second expansion pipe are respectively symmetrically arranged in both ends of cylindrical pipe, and first expansion pipe is arranged above cylindrical pipe, the gas warehouse is arranged above first expansion pipe, the gas outlet is arranged on the gas warehouse, the fixed plate is arranged in the gas warehouse, a plurality of groups of nozzles are arranged on the fixed plate, the gas inlet is arranged below second expansion pipe, the gas inlet is arranged on the gas warehouse, the fixed frame is arranged in the gas warehouse, the center tube is fixedly arranged on the fixed frame, and the center tube is arranged in the cylindrical pipe, the inner spiral fan group is arranged in the center tube, the outer spiral fan group is arranged between the cylindrical pipe and the center tube, the spiral direction of inner spiral fan group and outer spiral fan group is opposite, the cylindrical pipe and the center tube still are provided with the adjusting mechanism for the pitch of inner spiral fan group and outer spiral fan group is adjusted synchronously.

[0008] Through adopting the above technical scheme, the first expansion pipe, the second expansion pipe and the cylindrical pipe form the shape of a Venturi tube, the tail gas enters the second expansion pipe from the gas inlet, and then enters the first expansion pipe through the cylindrical pipe, so that the flow rate of the tail gas is increased after passing through the Venturi tube. The application sets the inner spiral fan group and the outer spiral fan group in the cylindrical pipe, forming a plurality of inner spiral channels and a plurality of outer spiral channels. The tail gas with increased flow rate enters the inner spiral channels and the outer spiral channels to realize the spiral motion of the tail gas, thereby realizing the effect of removing dust in the tail gas by the cyclone dust collector. The application integrates the Venturi tube and the cyclone dust collector into one, effectively reducing the required floor area and overall volume of the equipment.

[0009] The application also makes the spiral directions of the inner spiral fan group and the outer spiral fan group opposite. When the tail gas passes through the spiral dust removal and enters the first expansion pipe, the tail gas output by the inner spiral channels and the tail gas output by the outer spiral channels collide with each other, improving the degree of chaos of the tail gas motion in the first expansion pipe, thereby improving the mixing degree of the tail gas and the liquid droplets output by the nozzles, and further removing dust and other particulate impurities in the tail gas.

[0010] The adjusting assembly in the application can also synchronously adjust the pitches of the inner spiral fan group and the outer spiral fan group, thereby increasing or reducing the cross-sectional areas of the inner spiral channels and the outer spiral channels. Reducing the cross-sectional areas can further accelerate the flow rate of the tail gas in the channels, and vice versa. Synchronously adjusting the pitches of the inner spiral fan group and the outer spiral fan group can also adjust the inclination angles of the inner spiral channels and the outer spiral channels. Reducing the pitches reduces the inclination angles, and the shape of the spiral channels tends to be horizontal, making the tail gas more turbulent, thereby adjusting the washing effect of the tail gas.

[0011] Optionally, the adjusting mechanism comprises a first driving motor, a screw rod, a lifting disc and an adjusting assembly, the motor is arranged on the fixed frame, the screw rod is arranged on the output shaft of the first driving motor and located in the central pipe, the inner spiral fan group comprises a plurality of inner spiral fan blades, the outer spiral fan group comprises a plurality of outer spiral fan blades, the lifting disc is provided with a plurality of groups corresponding to a plurality of groups of the inner spiral fan blades and a plurality of groups of the outer spiral fan blades, and a plurality of groups of the lifting disc are threadedly connected to the screw rod, a plurality of threads are formed in the screw rod corresponding to a plurality of groups of the lifting disc, and the pitches of the plurality of threads increase from top to bottom, and the adjusting assembly is provided with a plurality of groups, and a plurality of groups of the adjusting assembly are arranged on a plurality of groups of the lifting disc, the adjusting assembly is used for rotating and limiting the lifting disc, and when the lifting disc is lifted on the screw rod, the lifting disc can lift and adjust the inclination of the inner spiral fan blades and the outer spiral fan blades.

[0012] By adopting the above technical scheme, the first driving motor is started, the output shaft of the first driving motor drives the screw rod to rotate, under the action of the adjusting assembly rotating and limiting the lifting disc, the rotation of the screw rod can drive the lifting disc to lift on the screw rod, because a plurality of threads are formed in the screw rod corresponding to a plurality of groups of the lifting disc, and the pitches of the plurality of threads increase from top to bottom, so that the lifting height of each lifting disc is different when the screw rod rotates, and the lifting amplitude of the lifting disc closer to the lower part is larger, thereby realizing the synchronous increase and decrease of the spacing between adjacent lifting discs, so that the lifting disc can lift and adjust the inclination of the inner spiral fan blades and the outer spiral fan blades under the action of the adjusting assembly.

[0013] Optionally, the adjusting assembly comprises a lifting rod, a partition plate and a ball, the lifting rod is provided with a plurality of groups, the central pipe is provided with a plurality of avoiding holes for the lifting rod to lift, one end of a plurality of groups of the lifting rod is arranged on the side wall of a plurality of groups of the lifting disc, the ball is arranged at the end of the lifting rod away from the screw rod, the inner wall of the cylindrical pipe is provided with a lifting groove, the ball is slidingly arranged in the lifting groove, the partition plate is provided with a plurality of groups corresponding to a plurality of groups of the avoiding holes, a plurality of active cavities are formed in the wall thickness of the central pipe corresponding to a plurality of groups of the partition plate, the partition plate is arranged on the lifting rod and liftable in the active cavity, and the two ends of the inner spiral fan blades and the outer spiral fan blades are respectively connected with adjacent lifting rods.

[0014] By adopting the technical scheme, since the lifting rods are fixedly installed on the lifting disc, and the two ends of the inner spiral fan blade and the outer spiral fan blade are connected with the adjacent lifting rods, the lifting and bending of the inner spiral fan blade and the outer spiral fan blade can be realized when the lifting disc drives the lifting rods to lift, since the distance between the adjacent lifting discs is synchronously increased and decreased, the distance between the adjacent inner spiral fan blades and outer spiral fan blades in the height direction can be synchronously increased and decreased, thereby the cross-sectional area of the inner spiral channel and the outer spiral channel is increased or decreased, 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 the inclination angle of the inner spiral channel and the outer spiral channel is adjusted, the adjustment of the washing effect of the tail gas is realized, and the ball reduces the friction between the lifting rod and the inner wall of the cylindrical pipe, thereby the load of the first driving motor is reduced.

[0015] Optionally, a water storage tank is arranged below the air inlet bin, a water inlet is arranged on the water storage tank, and a water inlet hole for spraying water into the water storage tank is arranged on the upper wall of the water storage tank. A circulating mechanism for recycling the spraying water is arranged in the water storage tank.

[0016] By adopting the technical scheme, the water flow collected by the spraying water can enter the second expanding pipe along the spiral channel, and then enter the water storage tank through the air inlet bin and the water inlet hole for recycling. The spraying water can also flush the spiral channel to some extent when it is in the spiral channel, thereby reducing the influence of the dust accumulated in the spiral channel for a long time on the dust removal effect of the spiral channel. When the inner spiral fan blade and the outer spiral fan blade are bent, the adhesion strength of the mud and the like attached to the inner spiral fan blade and the outer spiral fan blade is reduced, so that the mud and the like are loosened, the flushing effect of the spraying water is further improved, the adsorption effect of the dust in the tail gas is improved when the surface of the inner spiral fan blade and the outer spiral fan blade is wetted by the spraying water, the washing effect of the tail gas is further improved, and the circulating mechanism in the application can realize the recycling of the spraying water, thereby reducing the waste of water resources.

[0017] Optionally, the circulating mechanism comprises a second driving motor, a rotating rod, rotating fan blades, a water outlet pipe, a water pump and a dredging assembly. The second driving motor is arranged above the water storage tank and located in the air inlet bin. The rotating rod is arranged on the output shaft of the second driving motor and rotatably arranged in the water storage tank. The rotating fan blades are symmetrically arranged in multiple groups, and each group of the rotating fan blades is arranged on the rotating rod. A conical frustum is arranged at the center of the inner bottom wall of the water storage tank. One end of the water outlet pipe is in communication with the upper surface of the conical frustum, and the other end of the water outlet pipe is in communication with the nozzle. The water pump is arranged on the water outlet pipe and used for pumping the water in the water storage tank. The dredging assembly is arranged on the rotating rod and used for cleaning the dust deposited in the water storage tank.

[0018] By adopting the technical scheme, the second driving motor is started, the second driving motor drives the rotating fan blades on the rotating rod to rotate at a constant speed, the dust contained in the spraying water in the water storage tank is gradually collected to the edge of the inner bottom wall of the water storage tank, at this time, the spraying water in the middle of the water storage tank is relatively clean, the water pump is started, the water pump draws the relatively clean spraying water above the frustum through the water outlet pipe and conveys it to the nozzle for secondary use, the arc surface of the frustum can also reduce the accumulation of dust in the middle of the inner bottom wall of the water storage tank, thereby facilitating the dredging assembly to clean the deposited dust.

[0019] Optionally, the dredging assembly comprises a ratchet wheel, a pawl, a rotating disc, a rotating column, a dredging rod and a collection bin, the rotating column is provided in multiple groups, the multiple groups of rotating columns are arranged on the upper surface of the frustum at intervals with the center of the frustum as the rotation center, the rotating disc is fixedly arranged at the end of the rotating column away from the frustum, the dredging rod is fixedly arranged on the side wall of the rotating column, the ratchet wheel is arranged on the rotating disc, the pawl is arranged at the end of the rotating rod away from the second driving motor, when the rotating rod rotates counterclockwise, the ratchet wheel and the pawl mesh with each other to drive the multiple groups of dredging rods on the rotating rod to rotate, thereby cleaning the dust deposited in the water storage tank, the collection bin is arranged below the water storage tank, a strip-shaped hole is formed in the inner bottom wall of the water storage tank, the collection bin communicates with the inside of the water storage tank through the strip-shaped hole, and a water outlet is arranged on the collection bin.

[0020] By adopting the technical scheme, when the rotating rod rotates clockwise, the ratchet wheel and the pawl do not mesh, at this time, only the rotating fan blades are used to stir the spraying water, when the rotating rod rotates counterclockwise, the ratchet wheel and the pawl mesh, the rotating disc and the ratchet wheel rotate synchronously when the rotating rod rotates, thereby realizing synchronous rotation of the rotating column and the dredging rod fixedly connected with the rotating column, the inner bottom wall of the water storage tank can be cleaned when the dredging rod rotates, the dust deposited on the bottom is cleaned into the collection bin through the strip-shaped hole and discharged through the water outlet for recycling.

[0021] Optionally, a filter barrel is fixedly arranged on the frustum, a brush is arranged on the side of the rotating column away from the dredging rod, and the brush cleans the filter barrel when the rotating column rotates.

[0022] By adopting the technical scheme, the brush can continuously pour the filter barrel when the rotating column rotates, thereby avoiding blockage of the filter barrel and reducing the output efficiency of the water pump on the spraying water.

[0023] Optionally, a communication pipe is arranged on the fixed plate, and one end of the communication pipe away from the fixed plate is arranged at the same height as the end of the first diameter expansion pipe close to the air outlet.

[0024] By adopting the technical scheme, since the cross-sectional diameter of the first diameter-enlarged pipe gradually increases, the waste gas diffuses to the inner wall of the first diameter-enlarged pipe after the pressure of the waste gas entering the first diameter-enlarged pipe is reduced, the central gas pressure of the first diameter-enlarged pipe is reduced, and therefore the height of the one end of the communicating pipe away from the fixed plate is arranged at the end of the first diameter-enlarged pipe close to the gas outlet, so that the waste gas forms a circuitous gas flow path below the fixed plate, and the mixing effect of the waste gas and the spraying water is further improved.

[0025] Optionally, the frustum is provided with a light source and a light sensor, and the light source and the light sensor are arranged in the filter bucket in a spaced manner.

[0026] By adopting the technical scheme, the light source emits light which is received by the light sensor, when the water in the middle of the water storage tank gradually becomes turbid, the light intensity received by the light sensor is reduced, and when the light intensity is reduced to a preset value, the spraying water in the water storage tank needs to be replaced according to the signal output of the light sensor, when the spraying water needs to be replaced, the original spraying water in the water storage tank is discharged through the water outlet after the water outlet is opened, and then the water inlet is closed to inject water into the water storage tank.

[0027] Optionally, a protective cover for protecting the first driving motor and the second driving motor is arranged between the fixed frame and the water storage tank.

[0028] By adopting the technical scheme, the protective cover can avoid the first driving motor and the second driving motor from directly contacting the spraying water, so that the service life of the first driving motor and the second driving motor is prolonged.

[0029] In summary, the present application has at least one of the following beneficial technical effects:

[0030] 1. The first diameter-enlarged pipe, the second diameter-enlarged pipe and the cylindrical pipe form the shape of a Venturi pipe, the tail gas enters the second diameter-enlarged pipe from the gas inlet, and then enters the first diameter-enlarged pipe through the cylindrical pipe, so that the flow rate of the tail gas is increased after passing through the Venturi pipe, and the inner spiral fan group and the outer spiral fan group are arranged in the cylindrical pipe, forming a plurality of inner spiral channels and a plurality of outer spiral channels, the tail gas with increased flow rate enters the inner spiral channels and the outer spiral channels to realize spiral motion of the tail gas, so that the effect of removing dust in the tail gas by the cyclone dust collector is realized, and the Venturi pipe and the cyclone dust collector are integrated, so that the required floor area and overall volume of the equipment are effectively reduced.

[0031] 2. The spiral directions of the inner spiral fan group and the outer spiral fan group are opposite, when the tail gas passes through the spiral dust removal and enters the first diameter-enlarged pipe, the tail gas output by the inner spiral channel and the tail gas output by the outer spiral channel collide with each other, the chaotic degree of the tail gas motion in the first diameter-enlarged pipe is improved, the mixing degree of the tail gas and the liquid droplets output by the nozzle is improved, and the dust and other particulate impurities in the tail gas are further removed.

[0032] 3. The adjustment assembly in the 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. The decrease in 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. A decrease in pitch leads to a decrease in inclination angle, and the spiral channel shape tends to be horizontal, making the exhaust gas more turbulent, thereby adjusting the washing effect of the exhaust gas;

[0033] 4. The water flow collected by the spraying water can enter the second expanding pipe along the spiral channel, then enter the water storage tank through the air inlet chamber and the water inlet hole for recycling. The spraying water can also wash the spiral channel to some extent when it is in the spiral channel, thereby reducing the influence of the dust accumulated in the spiral channel for a long time on the dust removal effect of the spiral channel. When the inner and outer spiral fan blades are bent, the adhesion strength of the mud and other substances attached to the inner and outer spiral fan blades can be reduced, so that they are loosened, thereby further improving the washing effect of the spraying water. When the surfaces of the inner and outer spiral fan blades are wetted by the spraying water, the adsorption effect of the dust in the exhaust gas can be improved, thereby further improving the washing effect of the exhaust gas. The recycling mechanism in the application can realize the recycling of the spraying water, thereby reducing the waste of water resources;

[0034] 5. The second drive motor is started to drive the rotating fan blades on the rotating rod to rotate at a constant speed. The dust contained in the spraying water in the water storage tank will gradually collect to the edge of the inner bottom wall of the water storage tank. At this time, the spraying water in the middle of the water storage tank is relatively clean. The water pump is started to pump the relatively clean spraying water above the frustum through the water outlet pipe to the nozzle for secondary use. The arc surface of the frustum can also reduce the accumulation of dust in the middle of the inner bottom wall of the water storage tank, thereby facilitating the cleaning of the deposited dust by the dredging assembly.

[0035] 6. Since the cross-sectional diameter of the first expanding pipe gradually increases, the exhaust gas entering the first expanding pipe will diffuse to the inner wall of the first expanding pipe when the pressure decreases. Therefore, the height of the one end of the connecting pipe away from the fixed plate is arranged at the end of the first expanding pipe close to the air outlet, so that the exhaust gas forms a circuitous airflow path below the fixed plate, thereby further improving the mixing effect of the exhaust gas and the spraying water. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0038] Figure 2 is a schematic diagram of the cross-sectional structure of Figure 1

[0039] Figure 3 is a schematic diagram of the partial structure of Figure 2

[0040] Figure 4 is a schematic diagram of the enlarged structure of part A of Figure 2

[0041] Figure 5 is a schematic diagram of the structure of the ratchet and pawl.

[0042] Reference signs: 1, first diameter expansion pipe; 11, air outlet chamber; 12, air outlet; 13, fixed plate; 14, nozzle; 2, second diameter expansion pipe; 21, air inlet chamber; 22, air inlet; 3, cylindrical pipe; 31, center pipe; 4, adjusting assembly; 41, first driving motor; 42, screw rod; 43, lifting disc; 44, adjusting assembly; 441, lifting rod; 442, partition plate; 443, ball; 45, inner spiral fan blade; 46, outer spiral fan blade; 5, water storage tank; 51, water inlet; 6, circulating mechanism; 61, second driving motor; 62, rotating rod; 63, rotating fan blade; 64, water outlet pipe; 65, water pump; 66, dredging assembly; 661, ratchet; 662, pawl; 663, rotating disc; 664, rotating column; 665, dredging rod; 666, collecting chamber; 667, strip-shaped hole; 668, water outlet; 67, frustum; 7, filter barrel; 8, communication pipe; 9, light source; 91, light sensor; 10, protective cover. DETAILED DESCRIPTION

[0043] The following will be described in detail in combination with the accompanying drawings. Figures 1-5 The present application is further described in detail.

[0044] The embodiment of the present application discloses a tail gas washing system for compound fertilizer production, referring to Figure 1 and Figure 2 ​​​The utility model provides a tail gas washing system for compound fertilizer production, including first expansion pipe 1, second expansion pipe 2 and cylindrical pipe 3, first expansion pipe 1 and second expansion pipe 2 are respectively symmetrically welded and installed at the both ends of cylindrical pipe 3, and first expansion pipe 1 is installed above cylindrical pipe 3, and first expansion pipe 1 is welded and installed with gas outlet bin 11 above, and gas outlet bin 11 is welded and installed with gas outlet 12, and gas outlet bin 11 is welded and installed with fixed plate 13 in, and fixed plate 13 is fixedly installed with multiple groups of nozzles 14, and second expansion pipe 2 is welded and installed with gas inlet bin 21 below, and gas inlet bin 21 is welded and installed with gas inlet 22, and gas inlet bin 21 is welded and installed with fixed frame in, and fixed frame is welded and installed with center tube 31, and center tube 31 is installed in cylindrical pipe 3, and center tube 31 is movably installed with inner spiral fan group, and cylindrical pipe 3 and center tube 31 are movably installed with outer spiral fan group, and the spiral direction of inner spiral fan group and outer spiral fan group is opposite, and cylindrical pipe 3 and center tube 31 are further provided with adjusting mechanism.

[0045] First expansion pipe 1, second expansion pipe 2 and cylindrical pipe 3 form the shape of text, and the tail gas enters second expansion pipe 2 from gas inlet 22, and then enters first expansion pipe 1 through cylindrical pipe 3, so as to realize the effect that the flow rate of tail gas increases after passing through text, and the embodiment is provided with inner spiral fan group and outer spiral fan group in cylindrical pipe 3, forming multiple inner spiral channels and multiple outer spiral channels, and the tail gas with increased flow rate enters inner spiral channel and outer spiral channel to realize the spiral motion of tail gas, so as to realize the effect that the cyclone dust collector removes dust in tail gas, and the embodiment integrates text and cyclone dust collector into one, effectively reducing the land area and overall volume required by equipment.

[0046] The embodiment also makes the spiral direction of inner spiral fan group and outer spiral fan group opposite, when the tail gas enters first expansion pipe 1 after passing through spiral dust removal, the tail gas output by inner spiral channel and the tail gas output by outer spiral channel will collide with each other, improving the chaotic degree of tail gas motion in first expansion pipe 1, so as to improve the mixing degree of tail gas and liquid drops output by nozzle 14, and further remove dust and other particulate impurities in tail gas.

[0047] The adjusting assembly 4 in the embodiment can also synchronously adjust the pitch of inner spiral fan group and outer spiral fan group, so as to increase or reduce the cross-sectional area of inner spiral channel and outer spiral channel, and the reduction of cross-sectional area can further accelerate the flow rate of tail gas in the channel, and vice versa, and the synchronous adjustment of the pitch of inner spiral fan group and outer spiral fan group can also adjust the inclination angle of inner spiral channel and outer spiral channel, and the reduction of pitch reduces the inclination angle, and the shape of spiral channel approaches to horizontal state, so that the tail gas is more turbulent, so as to adjust the washing effect of tail gas.

[0048] And in this embodiment, the inner spiral fan group and the outer spiral fan group are each provided with three groups, and are uniformly spaced in a circle. The inner spiral fan group and the outer spiral fan group each being provided with three groups is a preferred mode of this embodiment, and in other embodiments, adjustments can be made according to actual use requirements.

[0049] With reference to Figure 2 , the fixed plate 13 is provided with a communication pipe 8, and the end of the communication pipe 8 away from the fixed plate 13 is arranged at the same height as the end of the first diameter expansion pipe 1 close to the gas outlet 12. Since the cross-sectional diameter of the first diameter expansion pipe 1 gradually increases, the pressure of the exhaust gas entering the first diameter expansion pipe 1 decreases and diffuses in the direction of the inner wall of the first diameter expansion pipe 1, and the central gas pressure of the first diameter expansion pipe 1 decreases. Therefore, the end of the communication pipe 8 away from the fixed plate 13 is arranged at the same height as the end of the first diameter expansion pipe 1 close to the gas outlet 12, which can form a detour airflow path for the exhaust gas below the fixed plate 13, thereby further improving the mixing effect of the exhaust gas and the sprayed water.

[0050] In order to adjust the inner and outer spiral channels, with reference to Figure 2 , Figure 3 and Figure 4 , the adjusting mechanism in this embodiment includes a first drive motor 41, a lead screw 42, a lifting disc 43, and an adjusting assembly 4. The motor is fixedly installed on the fixed frame, the lead screw 42 is welded and installed on the output shaft of the first drive motor 41 and located in the center pipe 31. The inner spiral fan group includes a plurality of inner spiral fan blades 45, and the outer spiral fan group includes a plurality of outer spiral fan blades 46. The lifting disc 43 is provided with a plurality of groups corresponding to the plurality of inner spiral fan blades 45 and the plurality of outer spiral fan blades 46, and the plurality of lifting discs 43 are threadedly connected and installed on the lead screw 42. A plurality of threads are formed on the lead screw 42 corresponding to the plurality of lifting discs 43, and the pitches of the plurality of threads increase from top to bottom. The adjusting assembly 4 is provided with a plurality of groups, and the plurality of adjusting assemblies 4 are respectively installed on the plurality of lifting discs 43. A clearance distance is provided between the outer spiral fan blades 46 and the inner wall of the cylindrical pipe 3, and between the inner spiral fan blades 45 and the inner wall of the center pipe 31.

[0051] Start the first drive motor 41, and the output shaft of the first drive motor 41 drives the lead screw 42 to rotate. Under the action of the adjusting assembly 4 rotating and limiting the lifting disc 43, the rotation of the lead screw 42 can drive the lifting disc 43 to rise and fall on the lead screw 42. Since a plurality of threads are formed on the lead screw 42 corresponding to the plurality of lifting discs 43, and the pitches of the plurality of threads increase from top to bottom, the lifting height of each lifting disc 43 is different when the lead screw 42 rotates, and the lifting amplitude of the lifting disc 43 closer to the bottom is larger, thereby realizing the synchronous increase and decrease of the distance between the adjacent lifting discs 43. In this way, under the action of the adjusting assembly 4, the lifting disc 43 can lift the inner spiral fan blades 45 and the outer spiral fan blades 46, and adjust the inclination angle of the inner spiral fan blades 45 and the outer spiral fan blades 46.

[0052] Referring to Figure 2 , Figure 3 and Figure 4 , the adjusting assembly 4 in this embodiment includes a plurality of lifting rods 441, a plurality of partition plates 442, and a plurality of rolling balls 443. The center pipe 31 is provided with a plurality of avoiding holes for the lifting rods 441 to lift. One end of each of the plurality of lifting rods 441 is welded to the sidewall of a plurality of lifting plates 43. The rolling ball 443 is rotatably installed at the end of the lifting rod 441 away from the lead screw 42. The inner wall of the cylindrical pipe 3 is provided with a lifting groove, and the rolling ball 443 is slidably installed in the lifting groove. The plurality of partition plates 442 correspond to the plurality of avoiding holes. The wall thickness of the center pipe 31 is provided with a plurality of movable cavities corresponding to the plurality of partition plates 442. The partition plate 442 is welded to the lifting rod 441 and movably installed in the movable 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.

[0053] Since the lifting rod 441 is fixedly installed on the lifting plate 43, and 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, when the lifting plate 43 drives the lifting rod 441 to lift, the lifting and bending of the inner spiral fan blade 45 and the outer spiral fan blade 46 can be realized. Since the distance between the adjacent lifting plates 43 is synchronously increased and decreased, the distance between the adjacent inner spiral fan blades 45 and outer spiral fan blades 46 in the height direction can be synchronously increased and decreased, thereby increasing or reducing 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, adjusting the washing effect of the exhaust gas, and reducing the friction between the lifting rod 441 and the inner wall of the cylindrical pipe 3, thereby reducing the load of the first driving motor 41.

[0054] Referring to Figure 1 and Figure 2The water storage tank 5 is welded and installed below the air inlet bin 21, the water inlet 51 is welded and installed on the water storage tank 5, the upper wall of the water storage tank 5 is provided with a water inlet hole, and the circulating mechanism 6 is arranged in the water storage tank 5. The water flow collected by the spray water can enter the second expanding 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 recycling. The spray water in the spiral channel can also wash the spiral channel to some extent, reduce the influence of the dust accumulated in the spiral channel for a long time on the dust removal effect of the spiral channel, and when the inner spiral fan blade 45 and the outer spiral fan blade 46 are bent, the adhesion strength of the mud and the like attached to the inner spiral fan blade 45 and the outer spiral fan blade 46 can be reduced, so that the mud and the like are loosened, the washing effect of the spray water is further improved, and when the surfaces of the inner spiral fan blade 45 and the outer spiral fan blade 46 are wetted by the spray water, the adsorption effect of the dust in the tail gas can be improved, and the washing effect of the tail gas is further improved. The circulating mechanism 6 in the embodiment can realize recycling of the spray water, and reduce waste of water resources.

[0055] With reference to Figure 2 The circulating mechanism 6 in the embodiment includes a second driving 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 driving motor 61 is fixedly installed above the water storage tank 5 and located in the air inlet bin 21. The rotating rod 62 is welded and installed on an output shaft of the second driving motor 61 and rotatably installed in the water storage tank 5. The rotating blades 63 are symmetrically arranged in multiple groups, and the multiple groups of rotating blades 63 are welded and installed on the rotating rod 62. A conical frustum 67 is welded and installed at a center position of an inner bottom wall of the water storage tank 5. One end of the water outlet pipe 64 is in communication with an upper surface of the conical frustum 67, and the other end is in communication with the nozzle 14. The water pump 65 is fixedly installed on the water outlet pipe 64. The dredging assembly 66 is installed on the rotating rod 62.

[0056] The second driving motor 61 is started, and the rotating blades 63 on the rotating rod 62 are driven to rotate at a constant speed. The dust contained in the spray water in the water storage tank 5 will gradually collect to the edge of the inner bottom wall of the water storage tank 5. At this time, the spray water in the middle of the water storage tank 5 is relatively clean. The water pump 65 is started, and the water pump 65 draws the relatively clean spray water above the conical frustum 67 through the water outlet pipe 64 and conveys the spray water to the nozzle 14 for secondary use. The arc surface of the conical frustum 67 can also reduce the accumulation of dust in the middle of the inner bottom wall of the water storage tank 5, so that the dredging assembly 66 can conveniently clean the precipitated dust.

[0057] A protective cover 10 is also welded and installed between the fixed frame and the water storage tank 5. The protective cover 10 can avoid the first driving motor 41 and the second driving motor 61 from being directly contacted with the spray water, thereby prolonging the service life of the first driving motor 41 and the second driving motor 61.

[0058] With reference to Figure 2 and Figure 5The dredging assembly 66 in the embodiment comprises a ratchet wheel 661, a ratchet pawl 662, a rotating disc 663, rotating columns 664, a dredging rod 665 and a collection bin 666. The rotating columns 664 are arranged in multiple groups, are spaced apart and are rotatably installed on the upper surface of the conical table 67 with the center of the conical table 67 as the rotating center. The rotating disc 663 is fixedly and weldedly installed on the end of the rotating column 664 away from the conical table 67. The dredging rod 665 is fixedly and weldedly installed on the side wall of the rotating column 664. The outer wall of the ratchet wheel 661 is weldedly installed on the rotating disc 663. The ratchet pawl 662 is rotatably installed on the end of the rotating rod 62 away from the second driving motor 61. The collection bin 666 is weldedly installed below the water storage tank 5. The inner bottom wall of the water storage tank 5 is provided with a strip-shaped hole 667. The collection bin 666 is in communication with the inside of the water storage tank 5 through the strip-shaped hole 667. The collection bin 666 is provided with a water outlet 668 weldedly installed thereon.

[0059] When the rotating rod 62 rotates clockwise, the ratchet wheel 661 and the ratchet pawl 662 are not engaged. At this time, only the spraying water is stirred by the rotating fan blade 63. When the rotating rod 62 rotates counterclockwise, the ratchet wheel 661 and the ratchet pawl 662 are engaged. When the rotating rod 62 rotates, the rotating disc 663 and the ratchet wheel 661 synchronously rotate, so that the rotating column 664 and the dredging rod 665 fixedly connected with the rotating column 664 synchronously rotate. When the dredging rod 665 rotates, the inner bottom wall of the water storage tank 5 can be cleaned. The dust deposited on the bottom is cleaned into the collection bin 666 through the strip-shaped hole 667 and is discharged and recycled through the water outlet 668.

[0060] With reference to Figure 2 The conical table 67 is fixedly provided with a filter barrel 7. The side of the rotating column 664 away from the dredging rod 665 is provided with a brush. The conical table 67 is provided with a light source 9 and a light sensor 91. The light source 9 and the light sensor 91 are arranged in the filter barrel 7 in a spaced apart manner. When the rotating column 664 rotates, the brush can continuously pour the filter barrel 7, so as to avoid the filter barrel 7 from being blocked and reduce the output efficiency of the water pump 65 on the spraying water. When the water in the middle of the water storage tank 5 gradually becomes turbid, the light intensity accepted by the light sensor 91 will be reduced. When the light intensity is reduced to a preset value, the spraying water in the water storage tank 5 needs to be replaced according to the signal output of the light sensor 91. When the spraying water needs to be replaced, the original spraying water in the water storage tank 5 is discharged through the opening of the water outlet 668, the water outlet 668 is closed, and then water is injected into the water storage tank 5 through the water inlet 51.

[0061] The implementation principle of the tail gas washing system for compound fertilizer production in the embodiment is as follows:

[0062] When it is necessary to reduce the overall volume and floor area of the device, the first diameter-increasing pipe 1, the second diameter-increasing pipe 2 and the cylindrical pipe 3 form the shape of a Venturi tube, the tail gas enters the second diameter-increasing pipe 2 from the gas inlet 22, and then enters the first diameter-increasing pipe 1 through the cylindrical pipe 3, so as to realize the effect of increasing the flow rate of the tail gas after passing through the Venturi tube, and the embodiment is provided with the inner spiral fan group and the outer spiral fan group in the cylindrical pipe 3, forming a plurality of inner spiral channels and a plurality of outer spiral channels, the tail gas with increased flow rate enters the inner spiral channels and the outer spiral channels to realize the spiral motion of the tail gas, thereby realizing the effect of removing dust in the tail gas by the cyclone dust collector, and integrating the Venturi tube and the cyclone dust collector into one, effectively reducing the floor area and overall volume required by the equipment.

[0063] When it is necessary to adjust the spacing and spiral inclination angle of the inner spiral fan blades 45 and the outer spiral fan blades 46, so as to adjust the washing effect on the tail gas according to actual use requirements, the first driving motor 41 is started, the output shaft of the first driving motor 41 drives the screw rod 42 to rotate, the screw rod 42 can drive the lifting disc 43 to lift on the screw rod 42, since a plurality of threads are formed on the screw rod 42 corresponding to the plurality of lifting discs 43, and the pitches of the plurality of threads increase from top to bottom, the lifting height of each lifting disc 43 is different when the screw rod 42 rotates, and the lifting amplitude of the lifting disc 43 closer to the bottom is greater, thereby realizing the synchronous increase and decrease of the spacing between the adjacent lifting discs 43, since the lifting rod 441 is fixedly installed on the lifting disc 43, and the two ends of the inner spiral fan blades 45 and the outer spiral fan blades 46 are connected with the adjacent lifting rods 441, the lifting of the lifting rod 441 driven by the lifting disc 43 can realize the lifting and bending of the inner spiral fan blades 45 and the outer spiral fan blades 46.

[0064] Since the spacing between the adjacent lifting discs 43 is synchronously increased and decreased, the spacing between the adjacent inner spiral fan blades 45 and the outer spiral fan blades 46 in the height direction can be synchronously increased and decreased, thereby realizing the increase or decrease of the cross-sectional area of the inner spiral channel and the outer spiral channel, and the lifting and bending of the inner spiral fan blades 45 and the outer spiral fan blades 46 realizes the adjustment of the spiral inclination angle of the inner spiral fan blades 45 and the outer spiral fan blades 46, so as to realize the adjustment of the inclination angle of the inner spiral channel and the outer spiral channel.

[0065] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the terms used in the specification and claims of the present application, such as "first", "second", "third", and the like, are not intended to denote any order, quantity, or importance, but are merely used to distinguish one component from another. The terms "one", "a", and the like are not intended to denote the number of objects, but are intended to denote the presence of at least one. The terms "comprise", "include" and the like are intended to denote the presence of the elements or components listed after the terms "comprise", "include" and the like, but do not exclude the presence of other elements or components. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0066] The above are optional embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A tail gas scrubbing system for compound fertilizer production, characterized by: The utility model relates to a kind of air supply devices, including first expansion pipe (1), second expansion pipe (2) and cylindrical pipe (3), the first expansion pipe (1) and the second expansion pipe (2) are respectively symmetrically arranged in the both ends of the cylindrical pipe (3), and the first expansion pipe (1) is arranged above the cylindrical pipe (3), air outlet (12) is provided on the air outlet warehouse (11) above the first expansion pipe (1), fixed plate (13) is arranged in the air outlet warehouse (11), a plurality of groups of nozzles (14) are arranged on the fixed plate (13), air inlet (22) is arranged on the air inlet warehouse (21) below the second expansion pipe (2), the air inlet warehouse (21) is arranged in the fixed frame, the center pipe (31) is fixedly arranged on the fixed frame, and the center pipe (31) is arranged in the cylindrical pipe (3), inner spiral fan group is arranged in the center pipe (31), outer spiral fan group is arranged between the cylindrical pipe (3) and the center pipe (31), the spiral direction of the inner spiral fan group and the outer spiral fan group is opposite, the cylindrical pipe (3) and the center pipe (31) are further provided with adjusting mechanism for the pitch of the inner spiral fan group and the outer spiral fan group is adjusted synchronously; The adjusting mechanism includes first drive motor (41), screw rod (42), lifting disc (43) and adjustment assembly (4), 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 located in the center pipe (31), the inner spiral fan group includes a plurality of inner spiral fan blades (45), the outer spiral fan group includes a plurality of outer spiral fan blades (46), the lifting disc (43) is provided with a plurality of groups corresponding to a plurality of the inner spiral fan blades (45) and a plurality of the outer spiral fan blades (46), and a plurality of the lifting discs (43) are all threadedly connected on the screw rod (42), a plurality of threads are formed on the screw rod (42) corresponding to a plurality of the lifting discs (43), and the pitch of a plurality of the threads increases from top to bottom, when the screw rod (42) rotates, the lifting height of each lifting disc (43) is different, and the lifting amplitude of the lifting disc (43) closer to the bottom is greater, the adjustment assembly (4) is provided with a plurality of groups, and a plurality of the adjustment assemblies (4) are respectively arranged on a plurality of the lifting discs (43), the adjustment assembly (4) is used for rotating limiting the lifting disc (43), and when the lifting disc (43) is lifted on the screw rod (42), the lifting disc (43) can lift the inner spiral fan blade (45) and the outer spiral fan blade (46), and adjust the inclination angle of the inner spiral fan blade (45) and the outer spiral fan blade (46). The adjusting assembly (4) comprises lifting rods (441), partition plates (442) and balls (443), the lifting rods (441) are provided in multiple groups, the central pipe (31) is provided with multiple avoiding holes for the lifting rods (441) to lift, one end of multiple lifting rods (441) is respectively arranged on the side wall of multiple lifting discs (43), the ball (443) is arranged on the end of the lifting rod (441) away from the lead screw (42), the inner wall of the cylindrical pipe (3) is provided with a lifting groove, the ball (443) is slidingly arranged in the lifting groove, the partition plate (442) is provided with multiple groups corresponding to the multiple avoiding holes, the central pipe (31) is provided with multiple active cavities in the wall thickness corresponding to the multiple partition plates (442), the partition plate (442) is arranged on the lifting rod (441) and is arranged in the active cavity in a lifting manner, and two ends of the inner spiral vane (45) and the outer spiral vane (46) are respectively connected with the adjacent lifting rod (441).

2. The tail gas washing system for compound fertilizer production according to claim 1, characterized in that: The water storage tank (5) is arranged below the air inlet bin (21), the water storage tank (5) is provided with a water inlet (51), and the upper wall of the water storage tank (5) is provided with a water inlet hole for spraying water into the water storage tank (5), and the water storage tank (5) is provided with a circulating mechanism (6) for recycling the spraying water.

3. The tail gas washing system for compound fertilizer production according to claim 2, characterized in that: The circulating mechanism (6) comprises a second driving motor (61), a rotating rod (62), rotating vanes (63), a water outlet pipe (64), a water pump (65) and a dredging assembly (66), the second driving motor (61) is arranged above the water storage tank (5) and located in the air inlet bin (21), the rotating rod (62) is arranged on the output shaft of the second driving motor (61) and rotatably arranged in the water storage tank (5), the rotating vanes (63) are symmetrically arranged in multiple groups, and multiple rotating vanes (63) are 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 in communication with the upper surface of the frustum (67), the other end is in communication with the nozzle (14), the water pump (65) is arranged on the water outlet pipe (64) and used for pumping water in the water storage tank (5), and the dredging assembly (66) is arranged on the rotating rod (62) and used for cleaning dust deposited in the water storage tank (5).

4. The tail gas washing system for compound fertilizer production according to claim 3, characterized in that: The dredging assembly (66) comprises a ratchet wheel (661), a pawl (662), a rotating disc (663), rotating columns (664), dredging rods (665) and a collection bin (666), the rotating columns (664) are arranged in multiple groups, the rotating columns (664) in the multiple groups are arranged on the upper surface of the frustum (67) in a spaced and rotating manner with the center of the frustum (67) as the rotating center, the rotating disc (663) is fixedly arranged at the end of the rotating column (664) away from the frustum (67), the dredging rods (665) are fixedly arranged on the side wall of the rotating column (664), the ratchet wheel (661) is arranged on the rotating disc (663), the pawl (662) is arranged at the end of the rotating rod (62) away from the second driving motor (61), when the rotating rod (62) rotates counterclockwise, the ratchet wheel (661) and the pawl (662) are engaged with each other to drive the dredging rods (665) on the rotating rod (62) to rotate, and the dust deposited in the water storage tank (5) is cleaned, the collection bin (666) is arranged below the water storage tank (5), a strip-shaped hole (667) is formed in the inner bottom wall of the water storage tank (5), the collection bin (666) is in communication with the inside of the water storage tank (5) through the strip-shaped hole (667), and a water outlet (668) is arranged on the collection bin (666).

5. The tail gas washing system for compound fertilizer production according to claim 4, characterized in that: The frustum (67) is fixedly provided with a filter barrel (7), one side of the rotating column (664) away from the dredging rod (665) is provided with a brush, and the brush cleans the filter barrel (7) when the rotating column (664) rotates.

6. The tail gas washing system for compound fertilizer production according to claim 1, characterized in that: The fixed plate (13) is provided with a communication pipe (8), one end of the communication pipe (8) away from the fixed plate (13) is arranged at the same height as the end of the first diameter expansion pipe (1) close to the air outlet (12).

7. The tail gas scrubbing system for compound fertilizer production according to claim 5, characterized in that: The frustum (67) is provided with a light source (9) and a light sensor (91), and the light source (9) and the light sensor (91) are arranged in the filter barrel (7) in a spaced manner.

8. The tail gas washing system for compound fertilizer production according to claim 3, characterized in that: The fixed frame and the water storage tank (5) are provided with a protective cover (10) for protecting the first driving motor (41) and the second driving motor (61).

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