A device and method for recovering circulating dust in a granulation tower

Abstract

The invention discloses a device and method for recovering dust circulating in a granulation tower, and relates to the technical field of urea granulation tower production. The device comprises an equipment frame, wherein a separation tank is arranged on the top of the equipment frame, and a separation motor is installed on the top of the separation tank to facilitate the separation of solid particles from dust gas, and the solid particle discharge does not cause the overflow of waste gas. In the solid particle waste collection process, it can be ensured that during continuous discharge, waste gas overflow will not be generated during discharge, and better discharge and slag discharge operation effects can be achieved. After the gas is discharged, auxiliary discharge of materials in the isolation chamber turned downward inside the collection cylinder can be achieved, and when the materials are turned over for discharge, the discharge process can be accelerated, and the completion degree of the discharge can be improved. By respectively treating the solid urea dust and the free ammonia in the gaseous state and then collecting them, the recovery and reuse of ammonia can be achieved to a greater extent.

Description

Technical Field

[0001] The invention relates to the technical field of urea granulation tower production, and in particular to a device and method for recovering circulating dust in a granulation tower. Background Art

[0002] Urea granulation tower is a large reinforced concrete structure for manufacturing granular fertilizer in the fertilizer production process. In the urea granulation tower, molten urea is sprayed from the nozzle on the top of the tower, cooled by air and condensed into granular urea. Granular urea undergoes a series of process treatments in the tower and is finally discharged through the bottom discharge port. The dust in the urea granulation tower mainly comes from the tail gas generated in the urea production process. The tail gas contains incompletely reacted urea and other impurities. After cooling and solidification, part of the urea exists in the tail gas in the form of dust. Urea dust is an amorphous particle with a certain amount of free ammonia.

[0003] For example, application number: CN 212440556 U. The present invention discloses an internal circulation dust recovery device, including a granulation tower, a cyclone dust collector, an induced draft fan and a heat exchanger. A recovery box with a sealed top is provided at the air outlet at the top of the granulation tower. The outlet provided at the top of the recovery box is connected to the inlet of the induced draft fan through an induced draft duct. The outlet of the induced draft fan is connected to the air inlet at the bottom of the granulation tower through an air outlet pipe. The cyclone dust collector is installed at the front end of the induced draft fan inlet, and the heat exchanger is provided at the outlet of the induced draft fan. The utility model effectively solves the problem of tailing and realizes zero dust emission into the atmosphere.

[0004] Based on the search of the above patents and in combination with the equipment in the prior art, it is found that when dust is recovered, since solid particles and waste gas need to be separated, overflow discharge of waste gas will occur during the discharge of solid waste, resulting in waste of ammonia in the waste gas and air pollution. Secondly, when treating dust waste gas, due to the mixed treatment, the ammonia in the waste gas cannot be effectively separated and absorbed, and the recovery efficiency of free ammonia is poor, resulting in waste of free ammonia. Therefore, a device and method for recovering dust circulating in a granulation tower are needed. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for recovering dust circulating in a granulation tower to solve the following technical problems: in the process of discharging solid waste, overflow discharge of waste gas will be caused, resulting in waste of ammonia in the waste gas and air pollution. The present invention can ensure that during the collection of solid particle waste, waste gas overflow will not be generated during continuous discharge, thereby achieving better discharge and slag discharge effects. By separately treating solid urea dust and free ammonia in the gaseous state and then collecting them, ammonia recovery and reuse can be achieved to a greater extent.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A dust recovery device for circulating in a granulation tower comprises an equipment frame, a separation tank is arranged on the top of the equipment frame, a separation motor is installed on the top of the separation tank, the output shaft of the separation motor passes through the top side wall of the separation tank, and a separation auger is installed on the output shaft of the separation motor, and an air inlet pipe and a guide pipe are connected to the top of the separation tank.

[0008] A mixing cylinder is provided on the bottom side of the equipment frame.

[0009] A recovery structure is provided between the separation tank and the mixing cylinder, and the recovery structure comprises a collecting cylinder, a movable sleeve is installed on the outer side of the top of the collecting cylinder, and a conveying cannula is installed on the outer side of the bottom of the collecting cylinder.

[0010] A fixing frame is vertically fixed on the outer side of the mixing barrel, and a sliding hole is arranged in the fixing frame.

[0011] The movable block is slidably arranged in the sliding hole of the fixing frame.

[0012] A hollow shaft is provided with a bearing seat in the movable block, and both ends of the hollow shaft are respectively installed in the bearing seat of the movable block through bearing cooperation.

[0013] A partition plate is installed on the outer side of the middle part of the hollow shaft.

[0014] A discharge air hole is provided on the outer side of the middle part of the hollow shaft, and the discharge air hole is arranged between two adjacent partition plates.

[0015] As a further solution of the present invention: a rod hole is opened on the top of the fixed frame, a limiting rod is movably inserted in the rod hole, the bottom end of the limiting rod is fixed to the top side surface of the movable block, and a spring is sleeved on the outer side of the bottom of the limiting rod, and both ends of the spring are fixed on the movable block and the inner wall of the top side of the sliding hole.

[0016] As a further solution of the present invention: a driving gear is mounted on one end of the hollow shaft, a support plate is fixed on one side of the bottom of one of the fixed frames, a driving motor is installed on the top side of the support plate, a rotating gear is installed on the output shaft of the driving motor, the rotating gear and the driving gear are arranged along the same plane, a first electrode plate is mounted on the bottom side of the sliding hole in one of the fixed frames, a second electrode plate is fixed on the bottom side of the movable block, the first electrode plate, the second electrode plate and the driving motor are connected in series, the driving motor is connected to the mains, and when the collecting cylinder moves to the bottommost position, the second electrode plate at the bottom of the movable block contacts the first electrode plate, and the driving gear is in meshing contact with the rotating gear.

[0017] When the second electrode plate contacts the first electrode plate, the driving motor can be powered on, and with the cooperation of the rotating gear, the driving gear can be driven to rotate, thereby realizing the rotation of the hollow shaft and driving the partition plate to rotate. When the storage position is flipped downward, the separated solid particles are sent into the collecting cylinder through the conveying tube.

[0018] As a further solution of the present invention: a connecting frame is fixedly connected to the top of one of the limit rods, and a conveying pipe is hoisted at the bottom end of the connecting frame, and the conveying pipe passes through the interior of the hollow shaft. An air inlet hole is opened on the conveying pipe, and the opening of the air inlet hole is set downward. When the collecting cylinder descends to discharge, when the hollow shaft rotates, when one group of discharge holes rotates to the bottom, the gaseous residual exhaust gas will enter the conveying pipe through the horizontal pipe of the three-way pipe, and the residual exhaust gas will be discharged through the air inlet hole, and the gas discharged from the air inlet hole will be discharged through the corresponding discharge hole. After the gas is discharged, it can realize auxiliary discharge of materials in the isolation chamber that is turned downward inside the collecting cylinder, and can accelerate the discharge process when the material is turned over for discharge, and at the same time improve the completion of the discharge.

[0019] As a further scheme of the present invention: a discharge pipe is fixed on the bottom side of the separation tank, and the discharge pipe is movably inserted in the movable sleeve pipe. A receiving pipe is connected to the top side of the middle part of the mixing cylinder, and the conveying plug is movably inserted in the receiving pipe. A mixing motor is installed on the outside of one end of the mixing cylinder, and a mixing rod is installed on the output shaft of the mixing motor. A mixing auger is arranged on the outside of the mixing rod. A discharge port is opened on the bottom side of the other end of the mixing cylinder, and an exhaust pipe is connected to the top side of the other end of the mixing cylinder. The solid particles in the collected exhaust gas are transported to the discharge port through the conveying plug and enter the mixing cylinder. At the same time, the absorption liquid with a dissolved structure enters the mixing cylinder through the sleeve air pipe, so as to realize solid-liquid mixing and collect ammonia in urea production to the greatest extent. The solid-liquid mixture can be collected through the discharge port, and the solid urea dust and the free ammonia in the gaseous state are treated separately and then assembled, so as to realize the recovery and reuse of ammonia to a greater extent.

[0020] As a further solution of the present invention: the dissolution structure is installed on the top of the equipment frame, the dissolution structure includes an absorption tank, an annular tube is suspended on the top of the absorption tank, an atomizing nozzle is connected and installed on the bottom side of the annular tube, a guide pipe is penetrated through the middle of the absorption tank, the bottom end of the guide pipe is connected to a hollow disk, an exhaust hole is opened in a ring shape on the hollow disk, a water inlet pipe is connected to the annular tube, the top of the guide pipe is connected to the guide pipe, and a one-way valve is installed on the guide pipe.

[0021] As a further solution of the present invention: the bottom end of the absorption tank is connected to a mixing auger, the top side of the mixing cylinder is connected to a set air pipe, a three-way pipe is movably inserted in the movable air pipe, one lateral end of the three-way pipe is connected to the conveying pipe, and the other lateral end of the three-way pipe is connected to the mixing auger.

[0022] A method for recovering circulating dust in a granulation tower comprises the following steps:

[0023] S1: Cyclone separation. The waste gas generated by the granulation tower enters the separation tank through the air inlet pipe, which can accelerate the cyclone of the waste gas, ensure that the dust gas is in a cyclonic state, and realize the sinking of solid particles in the dust gas and the separation from the gaseous ammonia.

[0024] S2: Rotary discharge. After the collection tube descends, the hollow shaft is driven to drive the conveying insert to rotate in the collection tube. During the solid particle waste collection process, it can ensure continuous discharge and no overflow of waste gas during discharge, so as to achieve better discharge and slag discharge effects.

[0025] S3: Spraying and dissolving. The gas containing ammonia enters the hollow disk through the guide tube and the guide tube, and is sprayed out through the exhaust hole on the hollow disk. At the same time, water is fed into the annular tube through the water inlet pipe, and sprayed through the atomizing nozzle to absorb and dissolve the free ammonia, so as to achieve a better absorption treatment effect and absorb the free ammonia to a greater extent.

[0026] S4: Mixed discharge. The solid particles in the collected waste gas are transported to the discharge port through the delivery cannula and enter the mixing barrel. At the same time, the absorption liquid with a dissolved structure enters the mixing barrel through the set air pipe, which can achieve solid-liquid mixing and collect ammonia in urea production to the greatest extent. The solid-liquid mixture can be collected through the discharge port. By separately treating the solid urea dust and the free ammonia in the gaseous state and then collecting them, the recovery and reuse of ammonia can be achieved to a greater extent.

[0027] Beneficial effects of the present invention:

[0028] In order to facilitate the separation of solid particles from dust gas and prevent the overflow of waste gas during the discharge of solid particles, during the collection process of solid particle waste, it can be ensured that during continuous discharge, no overflow of waste gas will be generated, thereby achieving better discharge and slag discharge effects.

[0029] When the gas passes through the dissolving structure, under the spraying action of the atomizing nozzle, it can absorb free ammonia to a greater extent. The absorption liquid is transported to the three-way pipe through the mixing auger. Under the action of its gravity, the absorption liquid is transported to the mixing cylinder through the vertical pipe of the three-way.

[0030] Among them, when the collecting cylinder descends to discharge, the gaseous residual exhaust gas will enter the conveying pipe through the horizontal pipe of the three-way pipe, and the residual exhaust gas will be discharged through the air inlet holes. The gas discharged from the air inlet holes will be discharged through the corresponding discharge holes. After the gas is discharged, it can realize the auxiliary discharge of the material in the isolation chamber that is turned downward inside the collecting cylinder, and can accelerate the discharge process when the material is turned over for discharge, while improving the completion of the discharge.

[0031] By separately treating the solid urea dust and the free ammonia in the gaseous state and then collecting them together, the recovery and reuse of ammonia can be achieved to a greater extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Figure 1 It is a schematic diagram of the overall first three-dimensional structure of the present invention.

[0034] Figure 2 It is a schematic diagram of the overall second three-dimensional structure of the present invention.

[0035] Figure 3 It is a schematic diagram of the main three-dimensional structure of the present invention.

[0036] Figure 4 It is a schematic diagram of the main body side structure of the present invention.

[0037] Figure 5 yes Figure 4 Schematic diagram of the structure cut along the middle line BB.

[0038] Figure 6 yes Figure 5 Schematic diagram of the structure of area A.

[0039] Figure 7 It is a schematic diagram of the internal structure of the collection tube.

[0040] Figure 8 It is a schematic diagram of the recycling structure.

[0041] Fig. 9 This is a half-section diagram of the collecting tube.

[0042] Fig.10 It is a schematic diagram of the internal structure of the separation tank.

[0043] Fig.11 It is a schematic diagram of the dissolved structure.

[0044] In the figure: 1, equipment frame, 2, dissolving structure, 3, separation tank, 4, air inlet pipe, 5, separation motor, 6, one-way valve, 7, guide pipe, 8, material receiving pipe, 9, exhaust pipe, 10, recovery structure, 11, mixing barrel, 12, discharge port, 13, mixing rod, 14, mixing auger, 15, guide pipe, 17, separation auger, 18, discharge pipe, 19, three-way pipe, 101, movable sleeve pipe, 102, driving gear, 103, hollow shaft, 104, driving motor, 105, support plate, 106, Rotating gear, 107, fixing frame, 108, collecting cylinder, 109, conveying cannula, 110, first electrode plate, 111, second electrode plate, 113, conveying pipe, 114, movable block, 115, spring, 116, connecting frame, 117, limiting rod, 118, discharge air hole, 119, partition plate, 120, air inlet hole, 201, absorption tank, 202, hollow disk, 203, exhaust hole, 204, atomizing nozzle, 205, water inlet pipe, 206, annular pipe, 91, mixing motor. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] See also Figure 1-10 As shown, the present invention is a dust recovery device for circulating in a granulation tower, comprising an equipment frame 1, a separation tank 3 is mounted on the top of the equipment frame 1, a separation motor 5 is installed on the top of the separation tank 3, the output shaft of the separation motor 5 passes through the top side wall of the separation tank 3, and a separation auger 17 is installed on the output shaft of the separation motor 5, and the top of the separation tank 3 is connected with an air inlet pipe 4 and a guide pipe 15.

[0047] During operation, dust is generated during the urea granulation process, and the dust exhaust gas enters the separation tank 3 through the air inlet pipe 4. Under the action of the separation motor 5, the separation motor 5 drives the separation auger 17 to rotate, and the dust exhaust gas moves in a vortex state. The solid particles of the dust gas sink to the bottom of the separation tank 3 and are discharged through the discharge pipe 18, thereby realizing the separation of solid dust so that they can be processed separately.

[0048] A mixing cylinder 11 is provided on the bottom side of the equipment frame 1 .

[0049] A recovery structure 10 is provided between the separation tank 3 and the mixing cylinder 11 , and the recovery structure 10 comprises a collecting cylinder 108 , a movable sleeve 101 is installed on the outer side of the top of the collecting cylinder 108 , and a transport cannula 109 is installed on the outer side of the bottom of the collecting cylinder 108 .

[0050] The fixing frame 107 is vertically fixed on the outer side of the mixing barrel 11 , and a sliding hole is arranged in the fixing frame 107 .

[0051] The movable block 114 is slidably disposed in a sliding hole of the fixing frame 107 .

[0052] The hollow shaft 103 and the movable block 114 are provided with a bearing seat, and both ends of the hollow shaft 103 are respectively installed in the bearing seat of the movable block 114 through bearings.

[0053] A rod hole is provided at the top of the fixing frame 107, and a limiting rod 117 is movably inserted into the rod hole. The bottom end of the limiting rod 117 is fixed to the top side surface of the movable block 114, and a spring 115 is sleeved on the outer side of the bottom of the limiting rod 117. The two ends of the spring 115 are fixed on the movable block 114 and the inner wall of the top side of the sliding hole.

[0054] A driving gear 102 is sleeved on one end of the hollow shaft 103, a support plate 105 is fixed to one side of the bottom of a fixing frame 107, a driving motor 104 is installed on the top side of the support plate 105, a rotating gear 106 is installed on the output shaft of the driving motor 104, and the rotating gear 106 and the driving gear 102 are arranged along the same plane.

[0055] A first electrode plate 110 is mounted on the bottom side of the sliding hole in one of the fixing frames 107, and a second electrode plate 111 is fixed on the bottom side of the movable block 114. The first electrode plate 110, the second electrode plate 111 and the driving motor 104 are connected in series, and the driving motor 104 is connected to the mains.

[0056] During operation, in order to facilitate the separation of solid particles from dust gas and prevent the discharge of solid particles from causing overflow of exhaust gas, the solid particles are input into the movable sleeve pipe 101 through the discharge pipe 18 after separation, and the particles enter the collecting tube 108. The solid particles will be stored in the space formed by two partition plates 119 located on both sides of the bottom port of the movable sleeve pipe 101.

[0057] As solid particles accumulate, the overall mass of the collecting tube 108 increases, causing the movable block 114 to gradually slide down along the sliding hole in the fixing frame 107. At this time, the spring 115 is stretched, the limiting rod 117 slides downward, and the movable sleeve 101 slides relative to the discharge pipe 18.

[0058] When the collecting tube 108 moves to the bottom position, the second electrode plate 111 at the bottom of the movable block 114 contacts the first electrode plate 110 , and the driving gear 102 contacts the rotating gear 106 .

[0059] When the second electrode plate 111 contacts the first electrode plate 110, the driving motor 104 can be powered on, and with the cooperation of the rotating gear 106, the driving gear 102 can be driven to rotate, thereby realizing the rotation of the hollow shaft 103, and driving the partition plate 119 to rotate. When the material storage position is flipped downward, the separated solid particles are sent into the mixing barrel 11 through the conveying tube 109.

[0060] After discharging, the overall mass of the collecting cylinder 108 is reduced, and the collecting cylinder 108 is stretched under the contraction operation of the spring 115. After the collecting cylinder 108 is pulled up, the second electrode plate 111 and the first electrode plate 110 are separated, the driving motor 104 is powered off and stopped, and the driving gear 102 is separated from the rotating gear 106.

[0061] After the collecting barrel 108 descends, the hollow shaft 103 is driven to drive the partition plate 119 to rotate in the collecting barrel 108. During the solid particle waste collection process, it can ensure continuous discharge and at the same time ensure that no waste gas overflow occurs during discharge, thereby achieving better discharge and slag discharge effects.

[0062] See also Fig.11 As shown, the dissolving structure 2 is mounted on the top of the equipment frame 1, and the dissolving structure 2 includes an absorption tank 201, and an annular pipe 206 is suspended on the top of the absorption tank 201, and an atomizing nozzle 204 is connected to the bottom side of the annular pipe 206, and a guide pipe 7 is arranged through the middle of the absorption tank 201, and the bottom end of the guide pipe 7 is connected to a hollow disk 202, and an exhaust hole 203 is opened in a ring shape on the hollow disk 202, and a water inlet pipe 205 is connected to the annular pipe 206, and the top of the guide pipe 7 is connected to the guide pipe 15, and a one-way valve 6 is installed on the guide pipe 7.

[0063] The bottom end of the absorption tank 201 is connected to a mixing auger 14, the top side of the mixing cylinder 11 is connected to a set air pipe, a three-way pipe 19 is movably inserted in the movable air pipe, one lateral end of the three-way pipe 19 is connected to the delivery pipe 113, and the other lateral end of the three-way pipe 19 is connected to the mixing auger 14. After the solid and gas of the urea waste gas are separated, the gas containing ammonia enters the hollow disk 202 through the guide pipe 15 and the guide pipe 7, and is ejected through the exhaust hole 203 on the hollow disk 202. At the same time, water is introduced into the annular tube 206 through the water inlet pipe 205, and sprayed through the atomizing nozzle 204 to absorb and dissolve the free ammonia, so as to achieve a better absorption and treatment effect and absorb the free ammonia to a greater extent.

[0064] A partition plate 119 is installed on the outer side of the middle portion of the hollow shaft 103 .

[0065] A discharge air hole 118 is provided on the outer side of the middle portion of the hollow shaft 103 , and the discharge air hole 118 is arranged between two adjacent partition plates 119 .

[0066] When the gas passes through the dissolving structure 2, under the spraying action of the atomizing nozzle 204, it can absorb free ammonia to a greater extent, and the absorption liquid is transported to the three-way pipe 19 through the mixing auger 14. Under the action of its gravity, the absorption liquid is transported to the mixing cylinder 11 through the vertical pipe of the three-way pipe 19.

[0067] A connecting frame 116 is fixedly connected to the top of one of the limiting rods 117, and a conveying pipe 113 is hoisted at the bottom end of the connecting frame 116. The conveying pipe 113 passes through the hollow shaft 103, and an air inlet hole 120 is opened on the conveying pipe 113, and the air inlet hole 120 is opened downward.

[0068] The residual waste gas in gaseous state is also discharged into the mixing barrel 11 through the three-way pipe 19 , and is transported by the rotation of the mixing rod 13 . With the cooperation of the mixing auger 14 , the residual waste gas in gaseous state passes through the mixing rod 13 .

[0069] Among them, when the collecting barrel 108 descends to discharge, when the hollow shaft 103 rotates, when one group of discharge holes 118 rotates to the bottom, the gaseous residual exhaust gas will enter the conveying pipe 113 through the cross pipe of the three-way pipe 19, and the residual exhaust gas will be discharged through the air inlet hole 120, and the gas discharged from the air inlet hole 120 will be discharged through the corresponding discharge hole 118. After the gas is discharged, it can realize the auxiliary discharge of the material in the isolation chamber that is turned downward inside the collecting barrel 108, and can accelerate the discharge process when the material is turned over for discharge, and at the same time improve the completion of the discharge.

[0070] A discharge pipe 18 is fixed to the bottom side of the separation tank 3 , and the discharge pipe 18 is movably inserted into the movable sleeve pipe 101 . A receiving pipe 8 is connected to the top side of the middle part of the mixing cylinder 11 , and the delivery insert pipe 109 is movably inserted into the receiving pipe 8 .

[0071] A mixing motor 91 is installed on the outside of one end of the mixing barrel 11, a mixing rod 13 is installed on the output shaft of the mixing motor 91, a mixing auger 14 is arranged on the outside of the mixing rod 13, a discharge port 12 is opened on the bottom side of the other end of the mixing barrel 11, and an exhaust pipe 9 is connected to the top side of the other end of the mixing barrel 11. During operation, the solid particles in the collected exhaust gas are transported to the discharge port 12 through the transporting insert 109 and enter the mixing barrel 11. At the same time, the absorption liquid passing through the dissolving structure 2 enters the mixing barrel 11 through the set air pipe, which can achieve solid-liquid mixing, collect ammonia in urea production to the greatest extent, collect the solid-liquid mixture through the discharge port 12, and by treating the solid urea dust and the free ammonia in the gas state separately and then collecting them, it can achieve greater recovery and reuse of ammonia.

[0072] A method for recovering circulating dust in a granulation tower comprises the following steps:

[0073] S1: Cyclone separation. The waste gas generated by the granulation tower enters the separation tank 3 through the air inlet pipe 4, which can accelerate the cyclone of the waste gas, ensure that the dust gas is in a cyclonic state, and realize the sinking of solid particles in the dust gas and the separation from the gaseous ammonia.

[0074] S2: Rotational discharge. After the collection barrel 108 descends, the hollow shaft 103 is driven to drive the conveying cannula 109 to rotate in the collection barrel 108. During the solid particle waste collection process, continuous discharge can be ensured, and at the same time, no waste gas overflow will be generated during discharge, so that better discharge and slag discharge operation effects can be achieved.

[0075] S3: Spraying and dissolving. The gas containing ammonia enters the hollow disk 202 through the guide pipe 15 and the guide pipe 7, and is sprayed out through the exhaust hole 203 on the hollow disk 202. At the same time, water enters the annular tube 206 through the water inlet pipe 205, and is sprayed through the atomizing nozzle 204 to absorb and dissolve the free ammonia, so as to achieve a better absorption treatment effect and absorb the free ammonia to a greater extent.

[0076] S4: Mixing and discharging. The solid particles in the collected waste gas are transported to the discharge port 12 through the transporting insert 109 and enter the mixing barrel 11. At the same time, the absorption liquid passes through the dissolving structure 2 and enters the mixing barrel 11 through the set air pipe, which can achieve solid-liquid mixing and collect ammonia in urea production to the greatest extent. The solid-liquid mixture can be collected through the discharge port 12. By separately treating the solid urea dust and the free ammonia in the gaseous state and then collecting them, the recovery and reuse of ammonia can be achieved to a greater extent.

[0077] Working principle: In order to facilitate the separation of solid particles from dust gas and prevent the discharge of solid particles from causing the overflow of exhaust gas, the solid particles are input into the movable sleeve pipe 101 through the discharge pipe 18 after separation, and the particles enter the collecting tube 108. The solid particles will be stored in the space formed by two partition plates 119 located on both sides of the bottom port of the movable sleeve pipe 101.

[0078] As solid particles accumulate, the overall mass of the collecting tube 108 increases, causing the movable block 114 to gradually slide down along the sliding hole in the fixing frame 107. At this time, the spring 115 is stretched, the limiting rod 117 slides downward, and the movable sleeve 101 slides relative to the discharge pipe 18.

[0079] When the collecting tube 108 moves to the bottom position, the second electrode plate 111 at the bottom of the movable block 114 contacts the first electrode plate 110 , and the driving gear 102 contacts the rotating gear 106 .

[0080] When the second electrode plate 111 is in contact with the first electrode plate 110, the driving motor 104 can be powered on, and with the cooperation of the rotating gear 106, the driving gear 102 can be driven to rotate, thereby realizing the rotation of the hollow shaft 103, and driving the partition plate 119 to rotate. When the storage position is flipped downward, the separated solid particles are sent into the collecting cylinder 108 through the conveying tube 109.

[0081] After discharging, the overall mass of the collecting cylinder 108 is reduced, and the collecting cylinder 108 is stretched under the contraction operation of the spring 115. After the collecting cylinder 108 is pulled up, the second electrode plate 111 and the first electrode plate 110 are separated, the driving motor 104 is powered off and stopped, and the driving gear 102 is separated from the rotating gear 106.

[0082] After the collecting barrel 108 descends, the hollow shaft 103 is driven to drive the partition plate 119 to rotate in the collecting barrel 108. During the solid particle waste collection process, it can ensure continuous discharge and at the same time ensure that no waste gas overflow occurs during discharge, thereby achieving better discharge and slag discharge effects.

[0083] When the gas passes through the dissolving structure 2, under the spraying action of the atomizing nozzle 204, it can absorb free ammonia to a greater extent, and the absorption liquid is transported to the three-way pipe 19 through the mixing auger 14. Under the action of its gravity, the absorption liquid is transported to the mixing cylinder 11 through the vertical pipe of the three-way pipe 19.

[0084] A connecting frame 116 is fixedly connected to the top of one of the limiting rods 117, and a conveying pipe 113 is hoisted at the bottom end of the connecting frame 116. The conveying pipe 113 passes through the hollow shaft 103, and an air inlet hole 120 is opened on the conveying pipe 113, and the air inlet hole 120 is opened downward.

[0085] The residual waste gas in gaseous state is also discharged into the mixing barrel 11 through the three-way pipe 19 , and is transported by the rotation of the mixing rod 13 . With the cooperation of the mixing auger 14 , the residual waste gas in gaseous state passes through the mixing rod 13 .

[0086] Among them, when the collecting barrel 108 descends to discharge, when the hollow shaft 103 rotates, when one group of discharge holes 118 rotates to the bottom, the gaseous residual exhaust gas will enter the conveying pipe 113 through the cross pipe of the three-way pipe 19, and the residual exhaust gas will be discharged through the air inlet hole 120, and the gas discharged from the air inlet hole 120 will be discharged through the corresponding discharge hole 118. After the gas is discharged, it can realize the auxiliary discharge of the material in the isolation chamber that is turned downward inside the collecting barrel 108, and can accelerate the discharge process when the material is turned over for discharge, and at the same time improve the completion of the discharge.

[0087] The solid particles in the collected waste gas are transported to the discharge port 12 through the transport cannula 109 and enter the mixing barrel 11. At the same time, the absorption liquid passes through the dissolving structure 2 and enters the mixing barrel 11 through the set air pipe, which can achieve solid-liquid mixing and collect ammonia in urea production to the greatest extent. The solid-liquid mixture can be collected through the discharge port 12. By separately treating the solid urea dust and the free ammonia in the gaseous state and then collecting them, the ammonia can be recycled and reused to a greater extent.

[0088] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dust recovery device for circulating in a granulation tower, characterized in that: include: An equipment frame (1), wherein a separation tank (3) is mounted on the top of the equipment frame (1), a separation motor (5) is mounted on the top of the separation tank (3), an output shaft of the separation motor (5) passes through the top side wall of the separation tank (3), a separation auger (17) is mounted on the output shaft of the separation motor (5), and an air intake pipe (4) and a first flow guide pipe (15) are connected to the top of the separation tank (3); A mixing cylinder (11), wherein the bottom side of the equipment frame (1) is provided with a mixing cylinder (11); A recovery structure (10), wherein the recovery structure (10) is disposed between the separation tank (3) and the mixing cylinder (11), and the recovery structure (10) comprises a collecting cylinder (108), a movable sleeve tube (101) is installed on the outer side of the top of the collecting cylinder (108), and a transport cannula (109) is installed on the outer side of the bottom of the collecting cylinder (108); A fixing frame (107), the fixing frame (107) being vertically fixed on the outer surface of the mixing barrel (11), and a sliding hole being arranged in the fixing frame (107); a rod hole being provided at the top of the fixing frame (107), a limiting rod (117) being movably inserted in the rod hole, the bottom end of the limiting rod (117) being fixed to the top side surface of the movable block (114), a spring (115) being sleeved on the outer side of the bottom of the limiting rod (117), and the two ends of the spring (115) being fixed to the movable block (114) and the inner wall of the top side of the sliding hole; a connecting frame (116) being fixedly connected to the top of one of the limiting rods (117), a conveying pipe (113) being hoisted at the bottom end of the connecting frame (116), the conveying pipe (113) being passed through the interior of the hollow shaft (103), an air inlet hole (120) being provided on the conveying pipe (113), and the air inlet hole (120) being arranged with its opening downward; A movable block (114), wherein the movable block (114) is slidably disposed in a sliding hole of the fixed frame (107); A hollow shaft (103), a bearing seat is arranged in the movable block (114), and both ends of the hollow shaft (103) are respectively mounted in the bearing seat of the movable block (114) through bearings; a driving gear (102) is sleeved on one end of the hollow shaft (103), a support plate (105) is fixed to one side of the bottom of a fixing frame (107), a driving motor (104) is mounted on the top side of the support plate (105), a rotating gear (106) is mounted on the output shaft of the driving motor (104), and the rotating gear (106) and the driving gear (102) are arranged along the same plane; A partition plate (119), wherein a partition plate (119) is installed on the outer side surface of the middle portion of the hollow shaft (103); A discharge air hole (118), wherein the discharge air hole (118) is provided on the outer side of the middle portion of the hollow shaft (103), and the discharge air hole (118) is arranged between two adjacent partition plates (119); The dissolving structure (2) is mounted on the top of the equipment frame (1), and the dissolving structure (2) comprises an absorption tank (201). An annular pipe (206) is suspended on the top of the absorption tank (201), and an atomizing nozzle (204) is connected and installed on the bottom side of the annular pipe (206). A second flow guide pipe (7) is provided through the middle of the absorption tank (201), and the bottom end of the second flow guide pipe (7) is connected to a hollow disk (202). An exhaust hole (203) is provided in a ring shape on the hollow disk (202). A water inlet pipe (205) is connected to the annular pipe (206), and the top of the second flow guide pipe (7) is connected to the first flow guide pipe (15). A one-way valve (6) is installed on the second flow guide pipe (7).

2. The dust recovery device for circulating in a granulation tower according to claim 1 is characterized in that: A first electrode plate (110) is mounted on the bottom side of a sliding hole in one of the fixed frames (107); a second electrode plate (111) is fixed on the bottom side of the movable block (114); the first electrode plate (110), the second electrode plate (111) and the drive motor (104) are connected in series; and the drive motor (104) is connected to a mains supply.

3. A granulation tower internal circulation dust recovery device according to claim 2, characterized in that: A discharge pipe (18) is fixed to the bottom side of the separation tank (3), and the discharge pipe (18) is movably inserted into the movable sleeve pipe (101). A receiving pipe (8) is connected to the top side of the middle part of the mixing cylinder (11), and the delivery insert pipe (109) is movably inserted into the receiving pipe (8).

4. The dust recovery device for circulating in a granulation tower according to claim 3 is characterized in that: A mixing motor (91) is mounted on the outside of one end of the mixing cylinder (11); a mixing rod (13) is mounted on the output shaft of the mixing motor (91); a mixing auger (14) is arranged on the outside of the mixing rod (13); a discharge port (12) is provided on the bottom side of the other end of the mixing cylinder (11); and an exhaust pipe (9) is connected to the top side of the other end of the mixing cylinder (11).

5. The dust recovery device for circulating in a granulation tower according to claim 4 is characterized in that: The bottom end of the absorption tank (201) is connected to a mixing auger (14), the top side of the mixing cylinder (11) is connected to a sleeve air pipe, a three-way pipe (19) is movably inserted into the movable air pipe, one lateral end of the three-way pipe (19) is connected to the delivery pipe (113), and the other lateral end of the three-way pipe (19) is connected to the mixing auger (14).

6. A recycling method based on the dust recycling device in a granulation tower according to claim 1, characterized in that: The steps include: S1: cyclone separation; the waste gas generated by the granulation tower enters the separation tank (3) through the air inlet pipe (4), which can accelerate the cyclone of the waste gas, ensure that the dust gas is in a cyclonic state, and realize the sinking of solid particles in the dust gas and the separation from the gaseous ammonia; S2: Rotational discharge; after the collection barrel (108) descends, the hollow shaft (103) is driven to drive the conveying insert (109) to rotate in the collection barrel (108). During the solid particle waste collection process, continuous discharge can be ensured, and at the same time, no waste gas overflow is generated during discharge, thereby achieving better discharge and slag discharge operation effects; S3: spraying and dissolving; the gas containing ammonia enters the hollow disk (202) through the first flow guide pipe (15) and the second flow guide pipe (7), and is sprayed out through the exhaust hole (203) on the hollow disk (202). At the same time, water is introduced into the annular tube (206) through the water inlet pipe (205), and sprayed through the atomizing nozzle (204), so as to absorb and dissolve the free ammonia, so as to achieve a better absorption treatment effect and absorb the free ammonia to a greater extent; S4: Mixing and discharging; the solid particles in the collected waste gas are transported to the discharge port (12) through the transport insert (109) and enter the mixing barrel (11). At the same time, the absorption liquid passes through the dissolving structure (2) and enters the mixing barrel (11) through the set air pipe, so that solid-liquid mixing can be achieved, and ammonia in urea production can be collected to the greatest extent. The solid-liquid mixture can be collected through the discharge port (12). By separately treating the solid urea dust and the free ammonia in the gaseous state and then collecting them, ammonia can be recovered and reused to a greater extent.

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