A spray drying tower

Abstract

The present invention discloses a spray drying tower, comprising a drying tower body, an annular slurry supply pipe arranged around the outer peripheral wall of the drying tower body, a plurality of slurry supply pipes evenly connected to the annular slurry supply pipe, each of which is connected to a plunger pump, a plurality of groups of spray guns evenly distributed on the peripheral wall of the drying tower body, each group of spray guns including at least two spray gun pipes, the spray gun pipes extending into the drying tower body, one end of which is connected to the annular slurry supply pipe, and the other end of which is provided with a nozzle, the nozzles on each group of spray guns being located on the same radius of the drying tower body and at a certain distance. The present invention designs a specific spray gun distribution structure, so that the distribution in the drying tower body is more uniform, and the droplets ejected by the spray guns can be evenly dispersed rather than gathered near the center of the drying tower, thereby facilitating full contact between the slurry and the strong hot air flow, ensuring the utilization rate of the hot air, and improving the overall drying conversion efficiency of the slurry, thereby reducing the energy consumption required for atomization drying.

Description

Technical Field

[0001] The invention relates to the technical field of granulated powder preparation devices, in particular to a spray drying tower. Background Art

[0002] Spray drying is a drying process in which a raw liquid material is atomized into droplets using a nozzle and then exposed to direct contact with the droplets using hot air or other gases to produce a powdered product. Research on spray drying technology began early, boasts a wide range of applications, and has been extensively studied. Currently, many ceramic companies are using centralized milling to produce granulated powders to address the significant performance variations of low-grade raw materials.

[0003] With the continuous expansion of industrial scale, spray drying equipment is developing towards large-scale development to increase the ability to process granulated powder per unit time. Existing spray drying equipment is mainly in the form of a spray drying tower, in which a circle of spray guns are evenly distributed, and each spray gun has a nozzle to achieve the purpose of uniform spraying of the slurry. However, in actual use, it is found that the existing form of spray gun distribution easily causes the droplets sprayed by the spray guns to gather near the center of the drying tower, making it impossible for the droplets to be evenly dispersed and unable to fully contact the strong hot air flow. There are defects such as low utilization rate of hot air, low overall drying conversion efficiency of the slurry, and high energy consumption. At the same time, the slurry fails to dry in time and is prone to problems such as wet material leakage and wall sticking. Summary of the Invention

[0004] In view of the above shortcomings, the present invention provides a spray drying tower, which can solve the problem of the existing spray drying device that the sprayed droplets gather near the center of the drying tower, making the droplets unable to be evenly dispersed and unable to fully contact the strong hot air flow.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A spray drying tower includes a drying tower body, wherein a hot air pipe for entering hot air is provided on the top of the drying tower body, and a discharge valve for discharging powder is provided at the bottom. An annular slurry supply pipe is provided around the outer peripheral wall of the drying tower body, and multiple slurry supply pipes are evenly connected to the annular slurry supply pipe. The multiple slurry supply pipes are respectively connected to plunger pumps. Multiple groups of spray guns are evenly distributed on the peripheral wall of the drying tower body, and each group of the spray guns includes at least two spray gun pipes. The spray gun pipe extends into the drying tower body, one end is connected to the annular slurry supply pipe, and the other end is provided with a nozzle. The nozzles on each group of the spray guns are located on the same radius of the drying tower body and at a certain distance.

[0007] Furthermore, the spray gun pipe includes a horizontally arranged spray gun pipe mounting section, a spray gun pipe extension section extending upward at an angle, and a spray rod section extending upward at an angle. The spray gun pipe mounting section, the spray gun pipe extension section, and the spray rod section are arranged in sequence, the free end of the spray gun pipe mounting section is connected to the annular slurry supply pipe, and the nozzle is installed on the free end of the spray rod section; the spray gun pipe mounting section of the spray gun pipe of each group of the spray guns is different in length, and the shorter spray gun pipe mounting section is installed above the longer spray gun pipe mounting section, so that the nozzles on each group of the spray guns are located on the same radius of the drying tower body and have a certain distance.

[0008] Furthermore, the angle between the spray gun pipe installation section and the spray gun pipe extension section is 141°; the angle between the spray gun pipe extension section and the spray rod section is 143°.

[0009] Furthermore, the nozzle includes a nozzle base, a nozzle cover, a diverter plate and an atomizer, one end of the nozzle base is connected to the spray gun tube, and the other end is connected to the nozzle cover, a chamber is formed between the nozzle cover and the nozzle base, the diverter plate and the atomizer are located in the chamber, the end face of the atomizer close to the nozzle cover is provided with a nozzle hole connected to the outside world, the end face of the atomizer facing the diverter plate is provided with a conical hole, the conical hole is coaxial with and connected to the nozzle hole, the end face of the atomizer facing the diverter plate is also provided with a plurality of cutting grooves tangent to the circumference of the tapered hole, and the through hole of the diverter plate is connected to the cutting groove.

[0010] Furthermore, the annular slurry supply pipe is connected to the slurry supply pipe by a hose, a sealing assembly is fixedly provided on the peripheral wall of the drying tower body, the sealing assembly has a through chamber, a sealing ring is provided in the chamber, the spray gun pipe mounting section passes through the sealing ring and can move axially on the sealing assembly.

[0011] Furthermore, the sealing assembly includes a fixed sleeve, a lip sealing ring and a circular sealing ring arranged in the chamber of the fixed sleeve, and a pressure cover is fixedly provided at the cavity mouth of the fixed sleeve to press the lip sealing ring in the chamber of the fixed sleeve; the spray gun pipe mounting section passes through the lip sealing ring and the circular sealing ring in the chamber of the fixed sleeve.

[0012] Furthermore, a fixed seat is fixedly provided on the outer peripheral wall of the drying tower body, and a slide groove is provided on the side of the fixed seat away from the drying tower body. A movable seat is fixedly provided on the outer peripheral wall of the spray gun pipe mounting section, and a slider matching the slide groove is provided on the movable seat, so that the movable seat can move closer to or away from the drying tower body through the cooperation of the slide groove and the slider.

[0013] Furthermore, a valve is provided on the pipeline connecting the annular slurry supply pipe and the spray gun.

[0014] Furthermore, the discharge valve includes a shell, an impeller shaft passing through the shell horizontally, blades evenly distributed on the impeller shaft, and a motor fixedly mounted on the outer wall of the shell. The motor is connected to the impeller shaft through a reducer, and a polytetrafluoroethylene plate or a rubber plate is provided at the end of the blade for contacting the inner wall of the shell.

[0015] Furthermore, the slurry supply pipe and the annular slurry supply pipe are tangent at the connection point.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention designs a specific spray gun distribution structure to achieve more uniform distribution in the drying tower body. The droplets sprayed by the spray gun can be evenly dispersed instead of gathering near the center of the drying tower, which is conducive to the full contact between the slurry and the strong hot air flow, ensuring the utilization rate of the hot air, and improving the overall drying conversion efficiency of the slurry, thereby reducing the energy consumption required for atomization drying;

[0018] 2. At the same time, the atomized droplets formed by the slurry can be dried in time, thus solving the problems of wet material leakage and wall sticking;

[0019] 3. The structural design of the spray gun tube makes the nozzle point to the center of the drying tower body and spray towards the center of the drying tower body, which can effectively prevent the slurry sprayed from the spray gun from hitting the inner wall of the drying tower body and reduce the wall sticking phenomenon;

[0020] 4. It helps to improve the contact efficiency between ceramic atomized slurry and hot air and the uniformity of ceramic atomized slurry in the entire drying tower, thereby increasing the production efficiency of ceramic drying powder;

[0021] 5. The multi-section bending spray gun tube increases the service life of the spray gun tube;

[0022] 6. The specific nozzle structure makes the slurry entering the nozzle produce a rotating motion, thereby obtaining the radial velocity and centrifugal force that can atomize the liquid, ensuring efficiency while reducing costs;

[0023] 7. The adjustable spray gun can adjust the atomization position of the spray gun so that the slurry reaches the optimal atomization position in the drying tower, providing a place for the drying and atomization of the ceramic slurry and reducing the loss of hot air in the drying tower;

[0024] 8. The slurry supply pipe and the annular slurry supply pipe are tangent at the connection point. As the slurry enters the annular slurry supply pipe from the slurry supply pipe in a tangential direction, the pressure of the slurry entering each spray gun is equal, which helps to achieve a uniform and unified atomization effect for each spray gun, and can make the slurry circulate smoothly in the annular slurry supply pipe while eliminating local sedimentation dead corners in the annular slurry supply pipe;

[0025] 9. By designing a star-shaped discharge valve, continuous discharge of drying powder in the drying tower is achieved, which improves the production efficiency of the product and ensures good sealing of the discharge valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0029] Figure 3 is an isometric cross-sectional view of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the nozzle in the present invention;

[0031] Figure 5 Schematic diagram of the assembly of the spray gun, sealing assembly, movable seat and fixed seat in the present invention;

[0032] Figure 6 is an isometric cross-sectional view of the sealing assembly of the present invention;

[0033] Figure 7 Schematic diagram of the explosion of the sealing assembly of the present invention;

[0034] Figure 8 Schematic diagram of the structure of the nozzle in the present invention;

[0035] Figure 9 is an isometric cross-sectional view of the nozzle of the present invention;

[0036] Figure 10 Schematic diagram of the structure of the diverter in the present invention;

[0037] Figure 11 Schematic diagram of the structure of the atomizer in the present invention;

[0038] Figure 12 It is a structural schematic diagram of the discharge valve in the present invention.

[0039] The markings shown in the figure are: 10-drying tower body; 11-hot air pipe; 12-annular slurry supply pipe; 13-slurry supply pipe; 14-hose; 15-plunger pump; 16-valve; 17-hot air distributor; 20-discharging valve; 21-housing; 22-impeller shaft; 23-blade; 24-motor; 25-speed reducer; 26-coupling sleeve; 28-front support; 29-rear support; 30-spray gun; 31-spray gun pipe; 311-spray gun pipe installation section; 312-spray gun pipe extension Extension section; 313-spray rod section; 40-nozzle; 41-nozzle base; 42-nozzle cover; 43-diverter; 431-through hole; 432-ring groove; 44-atomizer; 441-nozzle hole; 442-conical hole; 45-gasket; 50-sealing assembly; 51-fixed sleeve; 52-lip sealing ring; 53-circular sealing ring; 54-pressure cover; 60-fixed seat; 61-slide groove; 62-movable seat; 63-slider; 64-movable seat pressure cover; 70-support frame. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] Please refer to Figures 1 to 12 A preferred embodiment of the present invention provides a spray drying tower, comprising a drying tower body 10, which is supported and fixed by a support frame 70. A hot air pipe 11 for hot air to enter is provided at the top of the drying tower body 10, and a discharge valve 20 for powder to be discharged is provided at the bottom. The drying tower body 10 is provided with a hot air distributor 17 at the portion connected to the hot air pipe 11 so that the hot air can be evenly blown downward into the internal cavity of the drying tower body 10 in the form of hot air. The hot air distributor 17 is provided at the upper part of the drying tower body 10, and the hot air distributor 17 is fixed to the top of the drying tower body 10 by hexagonal bolts. During implementation, dry air is generated under the action of an external blower and a hot air heater, passes through the hot air delivery pipe 11, and finally reaches the hot air distributor 17, and then enters the drying tower body 10. The slurry is transported to the nozzle 40 through the spray gun tube 31, atomized and sprayed out at high speed through the nozzle 40, and the atomized slurry is sprayed out at high speed to the top of the drying tower body 10. Through contact with the hot air at the top, heat exchange is carried out, so that the water in the slurry evaporates and the solid matter in the material is dried into powder.

[0042] An annular slurry supply pipe 12 is provided around the outer peripheral wall of the drying tower body 10. The annular slurry supply pipe 12 is located in the upper middle part of the drying tower body 10 and is fixed to the outer peripheral wall of the drying tower body 10. A plurality of slurry supply pipes 13 are evenly connected to the annular slurry supply pipe 12, and the plurality of slurry supply pipes 13 are respectively connected to a plunger pump 15. In a preferred embodiment, the plunger pump 15 is connected to the slurry supply pipe 13 through a flange buckle and a flange outer sleeve. The slurry supply pipe 13 is fixed to the annular slurry supply pipe 12 through a channel steel and fixed by welding to achieve a sealing effect. The plunger pump 15, the slurry supply pipe 13 and the annular slurry supply pipe 12 are connected in sequence, so that when the plunger pump 15 is started, the slurry can be transported to the annular slurry supply pipe 12 through the slurry supply pipe 13 to achieve feeding.

[0043] When the spray gun 30 is working, if the slurry enters vertically, it is easy to cause the spraying pressure of each spray gun to be different. This is because the pressure at the slurry port of the annular slurry supply pipe 12 is the highest, but as the number of spray guns 30 increases, the pressure gradually decreases, resulting in a good atomization effect for the spray gun with high spraying pressure, and a poor atomization effect for the spray gun with low spraying pressure. In addition, the pressure of the slurry entering from different slurry ports is different, which easily leads to different atomization effects, that is, there are differences. In this preferred embodiment, the slurry supply pipe 13 and the annular slurry supply pipe 12 are tangential at the connection point, so that the slurry enters the annular slurry supply pipe 12 from the slurry supply pipe 13 in a tangential direction. The slurry enters the annular slurry supply pipe 12 along the tangential direction of the annular slurry supply pipe 12 to avoid the above problems. Specifically, in this preferred embodiment, the annular slurry supply pipe 12 is provided with 6 slurrying ports, and each slurrying port is tangentially connected to the annular slurry supply pipe 12 in a counterclockwise direction. The slurry in the annular slurry supply pipe 12 can use the thrust of the 6 slurrying ports to balance the pressure in the annular slurry supply pipe 12. The pressure of the slurry entering each spray gun 30 is equal, which helps to achieve a uniform and unified atomization effect for each spray gun 30, and can make the slurry circulate smoothly in the annular slurry supply pipe 12 while eliminating local sedimentation dead corners in the annular slurry supply pipe 12.

[0044] Multiple groups of spray guns 30 are evenly distributed along the perimeter of the drying tower 10, surrounding the drying tower 10. The spray guns 30 are located in the upper middle portion of the drying tower 10. Each group of spray guns 30 includes at least two spray gun tubes 31. In the preferred embodiment, each group of spray guns 30 includes two spray gun tubes 31. The spray gun tubes 31 extend into the drying tower 10, with one end connected to the annular slurry supply pipe 12 and the other end provided with a nozzle 40. Slurry in the annular slurry supply pipe 12 can enter the spray gun tubes 31 and ultimately be sprayed out of the nozzle 40 to achieve atomization. The nozzles 40 on each group of spray guns 30 are located on the same radius of the drying tower body 10 and have a certain distance therefrom. In this preferred embodiment, the two nozzles 40 on each group of spray guns 30 are located on the same radius of the drying tower body 10. At this time, the two nozzles 40 are located at the same height and have a certain distance therefrom, wherein one nozzle 40 is relatively close to the center of the drying tower body 10, while the other nozzle 40 is relatively far from the center of the drying tower body 10. At this time, the atomized slurry sprayed from the nozzle 40 can well cover the interior of the drying tower body 10, with a larger coverage area. The droplets sprayed from the spray gun 40 can be evenly dispersed instead of gathering near the center of the drying tower, which can facilitate full contact between the slurry and the strong hot air flow, ensure the utilization rate of the hot air, and improve the overall drying conversion efficiency of the slurry, reducing the energy consumption required for atomization drying; at the same time, the atomized droplets formed by the slurry can be dried in time, thereby solving the problems of wet material leakage and wall sticking.

[0045] In order to prevent or reduce the slurry sprayed from the spray gun 30 from hitting the wall of the drying tower and causing the wall to stick, the spray gun needs to have a certain spray angle. Figure 4The spray gun tube 31 includes a horizontally arranged spray gun tube mounting section 311, an upwardly extending spray gun tube extension section 312, and an upwardly extending spray rod section 313. The spray gun tube mounting section 311, the spray gun tube extension section 312, and the spray rod section 313 are arranged in sequence. The free end of the spray gun tube mounting section 311 is connected to the annular slurry supply pipe 12, and the nozzle 40 is mounted on the free end of the spray rod section 313. At this time, the spray rod section 313 is tilted upward, and the nozzle 40 points toward the center of the drying tower body 10 and sprays toward the center of the drying tower body 10. This can effectively prevent the slurry sprayed from the spray gun 30 from hitting the inner wall of the drying tower body 10 and reduce the wall sticking phenomenon. At the same time, considering the material deformation problem of the spray gun tube 31, the larger the bending amplitude, the greater the material deformation, the more affected the material service life, and is not conducive to the long-term operation of the spray gun tube 31. In this preferred embodiment, the spray gun tube 31 is multi-bend, specifically three-bend, with two turns. This allows the distal end of the spray gun tube 31 to tilt upward and minimize the amplitude of each turn, thereby minimizing the performance of the spray gun tube 31 and ensuring its long-term operation. In an exemplary embodiment, the angle between the spray gun tube mounting section 311 and the spray gun tube extension section 312 is 141°, and the angle between the spray gun tube extension section 312 and the spray rod section 313 is 143°. In this case, the angle between the spray rod section 313 and the spray gun tube mounting section 311 is approximately 105°, achieving the purpose of tilting the spray rod section 313 upward and preventing significant bending between the spray gun tube mounting section 311 and the spray gun tube extension section 312, and between the spray gun tube extension section 312 and the spray rod section 313.

[0046] The spray gun pipe mounting section 311 of the spray gun pipe 31 of each group of spray guns 30 is different in length. In this exemplary embodiment, the spray gun pipe mounting section 311 of the two spray gun pipes 31 of each group of spray guns 30 is different in length. The shorter spray gun pipe mounting section 311 is installed above the longer spray gun pipe mounting section 311, so that the nozzle 40 on each group of spray guns 30 is located on the same radius of the drying tower body 10 and has a certain distance. Considering that the diameter of the drying tower body 10 is large, if multiple spray gun pipes 31 are installed at the same height of the drying tower at the same time, it is easy to cause the droplets ejected by the spray gun to gather near the center of the drying tower, making it impossible for the droplets to be evenly dispersed and unable to fully contact with the strong hot air flow. In conjunction with the specific form of the spray gun 30 and the spray gun pipe 31 of the present embodiment, adopting long and short spray guns to be configured in pairs can make full use of the hot air in the drying tower body 10.

[0047] In a preferred embodiment, please refer to Figures 8 to 11The nozzle 40 includes a nozzle base 41, a nozzle cover 42, a diverter 43, and an atomizer 44. One end of the nozzle base 41 is threadedly connected to the spray gun tube 31, and the other end is threadedly connected to the nozzle cover 42. A chamber is formed between the nozzle cover 42 and the nozzle base 41, and the diverter 43 and the atomizer 44 are located in the chamber. Gaskets 45 are provided between the diverter 43 and the nozzle base 41, and between the atomizer 44 and the nozzle cover 42. In this case, the nozzle 40 forms a rotary pressure nozzle. The end face of the atomizer 44 near the nozzle cover 42 is provided with a nozzle hole 441 connected to the outside world, and the end face of the atomizer 44 facing the diverter plate 43 is provided with a tapered hole 442, which is coaxial with and connected to the nozzle hole 441. The diverter plate 43 is provided with multiple through holes 431 passing through both sides around a circle, and the diverter plate 43 is provided with an annular groove 432 on the side facing the atomizer 44 that is connected to the through hole 431 on it. The end face of the atomizer 44 facing the diverter plate 43 is also provided with multiple dividing grooves 443 that are tangent to the circumference of the tapered hole 442. The through holes 431 of the diverter plate 43 are connected to the dividing grooves 443 through the annular grooves 432. The end face of the atomizer 44 facing the diverter plate 43 forms a rotating chamber with the diverter plate 43 under the action of the tapered hole 442 and the dividing grooves 443. The slurry entering the nozzle base 41 from the spray gun tube 31 can enter the rotating chamber through the through hole of the diverter plate 43, first enter the part of the cutting groove 443 away from the tapered hole 442, and then enter the tapered hole 442 through the cutting groove 443. Since the cutting groove 443 is tangent to the circumference of the tapered hole 442, it enters the tapered hole 442 in the tangential direction, generating a rotating motion, thereby obtaining a radial velocity and centrifugal force that can atomize the liquid, ensuring efficiency while reducing costs. Taking into account the large structural dimensions of large-scale spray drying towers in actual production lines, the nozzle 40 is designed as a rotary pressure nozzle with a simple structure and low manufacturing cost, so that the nozzle 40 needs to be replaced and repaired frequently; and taking into account the low viscosity of the ceramic slurry and the granulation powder specifications between 60-100 mesh, it is designed as a pressure nozzle. A rotating chamber is provided inside the nozzle 30, and a rotating motion is generated through the rotating chamber, thereby obtaining a radial velocity and centrifugal force that can atomize the liquid, ensuring efficiency while reducing costs.

[0048] The annular slurry supply pipe 12 is connected to the slurry supply pipe 13 by a hose 14. A sealing assembly 50 is fixedly provided on the peripheral wall of the drying tower body 10. The sealing assembly 50 has a through chamber, and a sealing ring is provided in the chamber. The spray gun pipe mounting section 311 passes through the sealing ring and can move axially on the sealing assembly 50, thereby changing the length of the spray gun pipe mounting section 311 extending into the drying tower body 10, and thus changing the position of the nozzle 40 on the spray gun 30. The spray gun atomization position can be adjusted by moving the spray gun 30, so that the slurry reaches the optimal atomization position in the drying tower body 10, providing a place for the drying and atomization of the ceramic slurry, and reducing the loss of hot air in the drying tower body 10.

[0049] In a preferred embodiment, please refer to Figure 6 and Figure 7 The sealing assembly 50 includes a fixed sleeve 51, a lip seal 52 and a circular seal 53 disposed within the chamber of the fixed sleeve 51. A gland 54 is fixedly disposed at the opening of the fixed sleeve 51 to compress the lip seal 52 within the chamber of the fixed sleeve 51. The gland 54 is bolted to the end of the fixed sleeve 51. The spray gun pipe mounting section 311 passes through the lip seal 52 and circular seal 53 within the chamber of the fixed sleeve 51. The lip seal 52 and circular seal 53 achieve a seal and a certain degree of positional restraint, preventing the spray gun pipe mounting section 311 from easily moving within the sealing assembly 50.

[0050] A fixed seat 60 is fixedly provided on the outer peripheral wall of the drying tower body 10, and a slide 61 is provided on the side of the fixed seat 60 away from the drying tower body 10. A movable seat 62 is fixedly provided on the outer peripheral wall of the spray gun pipe mounting section 311, and a slider 63 is provided on the movable seat 62 to match the slide 61, so that the movable seat 62 can move closer to or away from the drying tower body 10 through the cooperation of the slide 61 and the slider 63, and under the cooperation of the movable seat 62 and the fixed seat 60, the spray gun pipe mounting section 311 will not rotate, that is, the spray gun 30 will not rotate. In a preferred embodiment, a cylindrical groove is opened above the movable seat 52, and the spray gun pipe 31 is placed in the cylindrical groove. The movable seat pressure cover 64 is tightened and fixed by bolts so that the spray gun pipe 31 and the movable seat 62 are fixed together. The fixed seat 60 is welded to the sealing assembly 50, and then the spray gun pipe 31 passes through the sealing assembly 50. The outer part of the sealing assembly 50 is welded to the drying tower body 10 to fix it.

[0051] The annular slurry supply pipe 12 is provided with a hard pipe, which is connected to the hose 14 through the hard pipe and thus connected to the spray gun 30. The pipe is provided with a valve 16. The valve 16 adopts an electric ball valve to achieve a shutoff effect, and by adjusting the opening of the valve 16, the spray pressure of the spray gun 30 can be adjusted.

[0052] In a preferred embodiment, Figure 12 As shown, the discharge valve 20 includes a shell 21, an impeller shaft 22 that passes through the shell 21 horizontally, blades 23 evenly distributed on the impeller shaft 22, and a motor 24 fixedly mounted on the outer wall of the shell 21. The motor 24 is connected to the impeller shaft 22 through a reducer 25. A polytetrafluoroethylene plate or a rubber plate is provided at the end of the blade 23 for contacting the inner wall of the shell 21.

[0053] The motor 24 is a progressive motor that cooperates with the impeller shaft 22, which passes through the bearing. The reducer 25 is a cycloid pinwheel reducer. The impeller shaft 22 cooperates with the reducer 25. Under the limiting action of the coupling sleeve 26, the coupling and reducer 25 are clamped and connected. Under the fixing of the hexagonal bolt, the coupling sleeve is connected to the front support 28 on the outside of the housing 21. The impeller shaft 22 is equipped with blades 23, and the end of the impeller shaft 22 is rotatably mounted on the rear support 29 on the rear side of the housing 21. The housing 21 is fixedly mounted on the bottom of the drying tower body 10, and its top and bottom are respectively provided with openings for the entry and exit of powder.

[0054] After the motor 24 is powered on, the output shaft of the motor 24 rotates, and after being decelerated by the reducer 25, it drives the coupling to rotate together. The impeller shaft 22 connected to the coupling also rotates synchronously. When the impeller shaft 22 rotates, it drives the blades 23 to rotate together, and the powder that falls into the impeller groove (the groove structure between two adjacent blades 23) is discharged as the blades 23 rotate.

[0055] Compared with the traditional discharge valve, the discharge valve of the preferred embodiment of the present invention is a star-shaped discharge valve, which mainly includes a shell and blades. The impeller usually includes 6-8 blades 23, and the distance between the blades 23 and the shell 31 is very small, generally not more than 0.05 mm. The traditional discharge valve discharges materials by operating the handle: when the dust accumulates to a certain amount on the closed butterfly valve, the butterfly valve is manually opened to discharge the dust into the collection device, but the disadvantage is that when the powder collection device is full of powder, it is necessary to replace it with another collection device, which leads to the phenomenon of hot air leakage in the tower when the powder collector is replaced. The star-shaped discharge valve of the present invention can achieve continuous discharge by controlling the motor, which can greatly improve production efficiency while ensuring good sealing of the discharge valve.

[0056] After the motor of the discharge valve 20 of the present invention is powered on and started, the powder discharge amount is proportional to the motor speed: when the impeller speed of the discharge valve 20 is low, the discharge amount is roughly proportional to the speed. When the speed is too high, the discharge amount decreases instead. The motor output shaft rotates. When the impeller speed is high, the impeller generates centrifugal force, which prevents the powder from fully falling into the impeller groove between the blades 23. The powder that has fallen between the blades 23 cannot be discharged in time due to the high speed. This part of the powder will be carried back to the tower by the blades. Therefore, when the motor 24 is driven, a reducer 25 needs to be installed to reduce the speed of the impeller. After the reducer 25 is decelerated, the coupling is driven to rotate together, and the impeller shaft 22 connected to the coupling also rotates synchronously. The impeller shaft 22 of the impeller needs to be connected to the outside of the housing and connected to the motor. Therefore, the seal between the impeller shaft 22 and the housing 21 is achieved by adding a packing seal. For the impeller shaft 22, since it is only subjected to radial forces, a deep groove ball bearing is selected as the rotating bearing. There is a slight gap between the blades 23 on the impeller and the housing 21. In order to minimize the air leakage in the drying tower body 10, a polytetrafluoroethylene plate or a rubber plate is installed at the end of each blade 23 to keep the blade 23 in close contact with the housing 21, ensuring good sealing of the discharge valve.

[0057] The present invention utilizes a specific spray gun distribution structure to achieve a more uniform distribution within the drying tower. The spray gun droplets are evenly dispersed rather than concentrated near the center of the drying tower, thereby facilitating full contact between the slurry and the strong hot air flow, ensuring the utilization of hot air, improving the overall drying conversion efficiency of the slurry, and reducing the energy consumption required for atomization drying. Furthermore, the atomized droplets formed by the slurry can be dried promptly, thereby resolving the problems of wet material leakage and wall sticking. The structural design of the spray gun tube allows the nozzle to point toward the center of the drying tower and spray toward the center of the drying tower, effectively preventing the spray gun from hitting the inner wall of the drying tower and reducing wall sticking. This helps improve the contact efficiency between the ceramic atomized slurry and the hot air, as well as the uniformity of the ceramic atomized slurry throughout the drying tower, thereby increasing the production efficiency of ceramic dry powder. Furthermore, the multi-section curved spray gun tube design increases the service life of the spray gun tube. The specific nozzle structure causes the slurry entering the nozzle to generate a rotational motion, thereby generating the radial velocity and centrifugal force required for liquid atomization, ensuring efficiency while reducing costs. The adjustable spray gun can adjust the spray gun atomization position so that the slurry reaches the optimal atomization position within the drying tower, providing a place for the ceramic slurry to dry and atomize, and reducing the loss of hot air in the drying tower. The slurry supply pipe and the annular slurry supply pipe are tangent at the connection point. Therefore, by entering the annular slurry supply pipe from the slurry supply pipe in a tangential direction, the slurry enters each spray gun with equal pressure, which helps to achieve a uniform and unified atomization effect for each spray gun. It can also enable the slurry to circulate smoothly in the annular slurry supply pipe while eliminating localized settling dead corners within the annular slurry supply pipe. The design of a star-shaped discharge valve enables continuous discharge of dry powder from the drying tower, improves product production efficiency, and ensures good sealing of the discharge valve.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A spray drying tower, comprising a drying tower body (10), wherein a hot air pipe (11) for hot air to enter is provided on the top of the drying tower body (10), and a discharge valve (20) for powder discharge is provided on the bottom. An annular slurry supply pipe (12) is provided around the outer peripheral wall of the drying tower body (10), and a plurality of slurry supply pipes (13) are evenly connected to the annular slurry supply pipe (12), and the plurality of slurry supply pipes (13) are respectively connected to plunger pumps (15). A plurality of groups of spray guns (30) are evenly distributed on the peripheral wall of the drying tower body (10), characterized in that: Each group of the spray guns (30) includes at least two spray gun tubes (31), each of the spray gun tubes (31) extends into the drying tower body (10), one end of which is connected to the annular slurry supply pipe (12), and the other end of which is provided with a nozzle (40), and the nozzles (40) on each group of the spray guns (30) are located on the same radius of the drying tower body (10) and at a certain distance; The spray gun pipe (31) includes a horizontally arranged spray gun pipe mounting section (311), a spray gun pipe extension section (312) extending upwardly obliquely, and a spray rod section (313) extending upwardly obliquely. The spray gun pipe mounting section (311), the spray gun pipe extension section (312), and the spray rod section (313) are arranged in sequence. The free end of the spray gun pipe mounting section (311) is connected to the annular slurry supply pipe (12), and the nozzle (40) is mounted on the free end of the spray rod section (313). The spray gun pipe (31) of each group of the spray guns (30) has a different length. The shorter spray gun pipe mounting section (311) is mounted above the longer spray gun pipe mounting section (311), so that the nozzles (40) on each group of the spray guns (30) are located on the same radius of the drying tower body (10) and have a certain distance therebetween. The nozzle (40) includes a nozzle base (41), a nozzle cover (42), a flow divider (43) and an atomizer (44). One end of the nozzle base (41) is connected to the spray gun tube (31), and the other end is connected to the nozzle cover (42). A chamber is formed between the nozzle cover (42) and the nozzle base (41). The flow divider (43) and the atomizer (44) are located in the chamber. The atomizer (44) is close to the end of the nozzle cover (42). A nozzle hole (441) communicating with the outside is provided on the surface of the atomizer (44), a tapered hole (442) is provided on the end surface of the atomizer (44) facing the diverter plate (43), the tapered hole (442) is coaxial with and communicates with the nozzle hole (441), and a plurality of slitting grooves (443) tangential to the circumference of the tapered hole (442) are further provided on the end surface of the atomizer (44) facing the diverter plate (43), and the through hole of the diverter plate (43) is communicated with the slitting grooves (443).

2. The spray drying tower according to claim 1, wherein: The included angle between the spray gun pipe installation section (311) and the spray gun pipe extension section (312) is 141°; and the included angle between the spray gun pipe extension section (312) and the spray rod section (313) is 143°.

3. The spray drying tower according to claim 1 or 2, wherein: The annular slurry supply pipe (12) and the slurry supply pipe (13) are connected via a hose (14); a sealing assembly (50) is fixedly provided on the peripheral wall of the drying tower body (10); the sealing assembly (50) is provided with a through chamber, a sealing ring is provided in the chamber, and the spray gun pipe mounting section (311) passes through the sealing ring and is capable of axial movement on the sealing assembly (50).

4. The spray drying tower according to claim 3, wherein: The sealing assembly (50) includes a fixed sleeve (51), a lip seal ring (52) and a circular seal ring (53) arranged in a cavity of the fixed sleeve (51); a pressure cover (54) is fixedly arranged at the cavity opening of the fixed sleeve (51) to press the lip seal ring (52) in the cavity of the fixed sleeve (51); the spray gun pipe mounting section (311) passes through the lip seal ring (52) and the circular seal ring (53) in the cavity of the fixed sleeve (51).

5. The spray drying tower according to claim 3, wherein: A fixed seat (60) is fixedly provided on the outer peripheral wall of the drying tower body (10), and a slide groove (61) is provided on the side of the fixed seat (60) away from the drying tower body (10). A movable seat (62) is fixedly provided on the outer peripheral wall of the spray gun pipe mounting section (311), and a slider (63) matching the slide groove (61) is provided on the movable seat (62), so that the movable seat (62) can move closer to or away from the drying tower body (10) through the cooperation between the slide groove (61) and the slider (63).

6. The spray drying tower according to claim 1 or 2, characterized in that: A valve (16) is provided on the pipeline connecting the annular slurry supply pipe (12) and the spray gun (30).

7. The spray drying tower according to claim 1, wherein: The discharge valve (20) comprises a housing (21), an impeller shaft (22) passing through the housing (21) transversely, blades (23) evenly distributed on the impeller shaft (22), and a motor (24) fixedly mounted on the outer wall of the housing (21). The motor (24) is connected to the impeller shaft (22) via a reducer (25). A polytetrafluoroethylene plate or a rubber plate is provided at the end of the blade (23) for contacting the inner wall of the housing (21).

8. The spray drying tower according to claim 1, wherein: The slurry supply pipe (13) and the annular slurry supply pipe (12) are tangent to each other at the connection point.

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