Multistage drying integrated spray drier

Abstract

Multi-stage drying integrated spray dryer relates to the technical field of material drying equipment, including main body frame, the main body frame is equipped with feeding atomization unit, multi-stage drying unit, gas-solid separation unit and waste heat dissipation unit. The feeding atomization unit adopts a composite atomization mode to ensure uniform particle size of the material, the multi-stage drying unit improves the drying effect through a three-stage gradient drying, the gas-solid separation unit optimizes the structure to achieve efficient separation, and the waste heat dissipation unit rapidly cools to prevent moisture regain. The present application solves the problems of uneven atomization particle size, insufficient drying, incomplete gas-solid separation, material moisture regain and deterioration, and improves the quality and production efficiency of the finished product.

Description

Technical Field

[0001] This invention relates to the field of material drying equipment technology, specifically to a multi-stage integrated spray dryer. Background Technology

[0002] In the material processing of the pharmaceutical industry, integrated atomization drying and gas-solid separation equipment is a key piece of equipment for ensuring product quality. Its core requirements are to achieve uniform atomization, efficient drying, thorough separation, and stable cooling of materials, ultimately improving finished product quality and reducing material loss. However, existing similar equipment still faces many technical bottlenecks in practical production applications, making it difficult to meet the high-efficiency and stable requirements of industrial production.

[0003] In the atomization stage, traditional equipment often relies on a single rotary shearing or airflow impact atomization mode. During material conveying, insufficient quantitative accuracy and residue in dead corners of the chamber can lead to unstable feeding. After atomization, the particle size distribution is wide, with large particles not being fully dried and small particles being over-dried, directly restricting the efficiency and effectiveness of subsequent drying processes. At the same time, material residue not only causes waste but may also affect the purity of the next batch of products due to deterioration of the residual material, increasing production and cleaning costs.

[0004] In the drying process, the single-stage drying structure has obvious limitations: the hot air flows along a single path in the tower, resulting in insufficient contact with the atomized particles, and the material falls quickly with a short residence time, leading to incomplete drying; the lack of a precise segmented air volume control mechanism makes it impossible to adjust the hot air volume according to the material drying process, often resulting in local over-drying and coking, and local under-drying, with large fluctuations in the moisture content of the finished product and difficulty in ensuring quality stability, especially for heat-sensitive materials, where the problem of over-drying and denaturation is more prominent.

[0005] In the gas-solid separation stage, most existing cyclone separators are straight cylinders or equal-diameter conical structures. When the gas-solid mixture rotates, it is easy to generate eddy current disturbances, resulting in poor centrifugal separation effect. Some fine particles are discharged with the airflow, causing material loss. At the same time, particles are easy to adhere to the inner wall of the separator and the isolation screen. Long-term operation can easily cause flow channel blockage, requiring frequent shutdowns for cleaning, interrupting production continuity, and further increasing production losses and labor costs.

[0006] In addition, dried materials usually carry a lot of residual heat. Existing equipment often lacks efficient residual heat dissipation structures and relies solely on natural cooling or simple ventilation to cool down. As a result, the material cools down slowly and the temperature distribution is uneven. The residual heat can easily cause the material to absorb moisture from the air, leading to dampness, or cause deterioration due to continuous high temperatures, affecting the shelf life and performance of the finished product.

[0007] To address the aforementioned production pain points, there is an urgent need to develop an integrated device that combines efficient atomization, gradient drying, stable gas-solid separation, and rapid cooling. Through structural optimization, this device can solve problems such as uneven particle size, poor drying effect, incomplete separation, and residual heat affecting the quality of finished products, thus meeting the industrial production demand for efficient, low-consumption, and high-quality processing. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a multi-stage integrated spray dryer, which solves problems such as uneven atomization particle size, insufficient contact of drying hot air, incomplete gas-solid separation, and difficulty in dissipating residual heat of materials, making them prone to moisture absorption and deterioration.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A multi-stage integrated spray dryer includes a main frame with its lower end grounded. The main frame is equipped with a feeding atomization unit, a multi-stage drying unit, a gas-solid separation unit, and a waste heat dissipation unit.

[0011] As an optimized solution, the feeding atomization unit includes a horizontal conveying atomization cylinder, a feeding conveying auger is provided inside the conveying atomization cylinder, an atomization turntable is rotatably provided on one side of the feeding conveying auger, and a number of centrally symmetrical atomizers are fixed on the atomization turntable.

[0012] As an optimized solution, the multi-stage drying unit includes a multi-stage drying tower, the lower end of which is fixedly connected to the conveying atomizing cylinder. The inner cavity of the multi-stage drying tower is divided into three sections from bottom to top, and each section is equipped with an independent drying mechanism.

[0013] As an optimized solution, each drying mechanism includes a drying air inlet box, which is fixed on the outer peripheral wall of the multi-stage drying tower. The inner peripheral wall of the multi-stage drying tower has several centrally symmetrical swirl air inlets corresponding to each drying air inlet box, and each swirl air inlet has an isolation net fixed inside it.

[0014] As an optimized solution, the air inlet directions of two adjacent drying air inlet boxes are opposite.

[0015] As an optimized solution, a T-shaped diversion pipe is fixed on the outer side of the air inlet end of the three drying air inlet boxes, and a drying fan is fixed on the longitudinal outer wall at the intersection of the T-shaped diversion pipes. Each branch of the T-shaped diversion pipe is equipped with an electric heating element, and an electronic flow valve is provided at the connection between the T-shaped diversion pipe and each drying air inlet box.

[0016] As an optimized solution, each set of the drying mechanisms also includes a swirl buffer.

[0017] As an optimized solution, the feeding atomizing unit further includes a feeding box, which is a closed square box. A feeding support frame is welded to the lower end of the feeding box, and the lower end of the feeding support frame is grounded.

[0018] As an optimized solution, a feeding hopper connected to the upper surface of the feeding box is fixed thereto, and a feeding pipe is fixed on the inner top surface of the feeding box.

[0019] As an optimized solution, one end of the conveying atomizing cylinder is fixed to and connected to the transverse end face of the feed box, while the other end of the conveying atomizing cylinder is enclosed and fixedly supported on the main frame.

[0020] As an optimized solution, a feeding conveyor motor is fixed on the other side of the transverse end face of the feeding box, and the output shaft of the feeding conveyor motor extends into the inside of the feeding box and is fixed to the end of the feeding conveyor auger.

[0021] As an optimized solution, a conveying air pump is fixed on each longitudinal outer end face of the feed box, and an airflow guide block is fixed on the inner bottom surface of the feed box.

[0022] As an optimized solution, the upper surface of the airflow guide block is provided with an isolation plate, which is fixedly fastened to the inner peripheral wall of the feed box.

[0023] As an optimized solution, an atomizing rotating motor is fixed on the closed end face of the conveying atomizing cylinder, and the atomizing rotating motor is fixedly connected to a horizontal connecting shaft. The end of the horizontal connecting shaft is fixed to the atomizing turntable, and the outer peripheral wall of the atomizing turntable is closely attached to the inner peripheral wall of the conveying atomizing cylinder.

[0024] As an optimized solution, a support plate is fixed on the main frame, a compressed air pump is fixed on the upper surface of the support plate, a horizontal air inlet pipe is fixedly connected to one side of the compressed air pump, three vertical air inlet pipes are fixedly connected to the horizontal air inlet pipe, the upper end of the vertical air inlet pipes is fixedly connected to the front half of the conveying atomizing cylinder, and each vertical air inlet pipe is provided with an air inlet shut-off valve.

[0025] As an optimized solution, a gas-gathering hood is fixedly connected to the other side of the compressed air pump, and the upper end of the gas-gathering hood is fixedly connected to the rear half of the conveying atomizing cylinder.

[0026] As an optimized solution, the cyclone buffer includes a vertical sleeve, on which several centrally symmetrical buffer plates are welded, with the ends of the buffer plates closely attached to the inner wall of the multi-stage drying tower.

[0027] As an optimized solution, the multi-stage drying tower has a cross-shaped connecting frame fixed on the inner peripheral wall near the upper and lower ends, a vertical central shaft fixed between two of the cross-shaped connecting frames, and three vertical sleeves rotatably fitted onto the vertical central shaft.

[0028] As an optimized solution, the upper end of the multi-stage drying tower is equipped with a transfer air pump, the transfer air pump is fixedly connected to a horizontal transfer pipe, and the horizontal transfer pipe is equipped with a transfer shut-off valve.

[0029] As an optimized solution, a drying support frame is welded onto the main frame, and the multi-stage drying tower is fixedly mounted on the drying support frame.

[0030] As an optimized solution, a separation support frame is also welded onto the main frame, and a horizontal mounting plate is welded to the upper end of the separation support frame. A material drop port is opened in the middle of the upper surface of the horizontal mounting plate.

[0031] As an optimized solution, the gas-solid separation unit includes a separation tower, the lower end of which is fixed to the horizontal mounting plate and connected to the discharge port.

[0032] As an optimized solution, the separation tower is equipped with a cyclone separator, which is a cone that gradually narrows from top to bottom, and a spiral flow channel is formed on the cone surface of the cyclone separator.

[0033] As an optimized solution, a conical guide seat is fixed on the upper surface of the cyclone separator.

[0034] As an optimized solution, a back-blowing air inlet box is fixed on the outer peripheral wall near the lower end of the separation tower, and several back-blowing air inlets are opened on the inner peripheral wall of the separation tower. The back-blowing air inlets are connected to the back-blowing air inlet box, and an isolation net is fixed in each of the back-blowing air inlets.

[0035] As an optimized solution, the back-blowing air inlet box is equipped with a back-blowing fan.

[0036] As an optimized solution, a transfer pipe is fixed at the upper end of the separation tower, the end of the transverse transfer pipe is fixedly connected to the transfer pipe, an exhaust pipe is connected to the upper end of the transfer pipe, and an exhaust valve is provided on the exhaust pipe.

[0037] As an optimized solution, a receiving hopper is fixed to the middle of the lower surface of the horizontal mounting plate, and a material transfer box is fixed to the lower end of the receiving hopper. The material transfer box is provided with a glass observation window.

[0038] As an optimized solution, a material transfer pipe is fixedly connected to the lower end of the material transfer box.

[0039] As an optimized solution, the waste heat dissipation unit includes a horizontal heat dissipation conveying cylinder, and the end of the material transfer pipe is fixedly connected to the heat dissipation conveying cylinder.

[0040] As an optimized solution, the heat dissipation conveying cylinder is located on one side of the separation support frame, and the heat dissipation conveying cylinder extends longitudinally.

[0041] As an optimized solution, a discharge conveying motor is fixed on the rear end face of the heat dissipation conveying cylinder, and the output shaft end of the discharge conveying motor passes through the side wall of the heat dissipation conveying cylinder and is fixed with a discharge conveying auger.

[0042] As an optimized solution, a discharge port is provided on the front end face of the heat dissipation conveying cylinder.

[0043] As an optimized solution, heat dissipation fins are fixed on the outer peripheral wall of the heat dissipation conveying cylinder.

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] 1. Excellent atomization effect, with uniform and controllable material particle size.

[0046] The feeding atomization unit adopts a composite atomization mode combining mechanical conveying, airflow purging, pneumatic impact, and rotary shearing. The feeding conveyor auger ensures stable and quantitative material delivery, while the side conveying air pumps, combined with the airflow guide block design, effectively prevent material residue in the feeding box. The compressed air pump supplies air in two directions: one provides secondary pneumatic conveying of the material, forcing it through the atomizer, while the other continuously lifts the particles. Simultaneously, the atomizing rotary table rotates at high speed with the motor, its outer wall tightly adhering to the inner wall of the conveying atomizing cylinder, creating secondary shearing of the material. Under this dual action, the material is broken into fine atomized particles with uniform particle size, laying the foundation for subsequent efficient drying.

[0047] 2. Multi-stage gradient drying improves drying efficiency and finished product quality.

[0048] The multi-stage drying tower adopts a three-section independent drying structure, with the air inlet vortexes of adjacent drying air inlets facing opposite directions. This creates an alternating swirling flow field within the tower, ensuring full contact with the atomized particles. The buffer plates of the swirling damper rotate with the airflow, slowing down the rising velocity of the particles and significantly extending the residence time of the material within the tower. Simultaneously, the electronic flow valves of the T-shaped diverter can precisely control the hot air volume in each drying chamber, achieving gradient drying. This avoids denaturation and charring caused by localized over-drying of the material, and also prevents undried material from being directly discharged, significantly improving the consistency of the moisture content and quality stability of the dried product.

[0049] 3. Highly efficient and stable gas-solid separation, reducing material loss.

[0050] The cyclone separator in the gas-solid separation unit adopts a tapered cone structure that gradually narrows from top to bottom, combined with a conical spiral flow channel design. This allows the gas-solid mixture to rotate at high speed, generating strong centrifugal force. Solid particles are quickly thrown against the wall and fall, resulting in high separation efficiency. The conical guide seat guides the gas-solid mixture smoothly into the cyclone separator, avoiding incomplete separation caused by eddy current disturbance. The back-blowing air box continuously introduces airflow into the separation tower, back-blowing and cleaning the inner wall of the cyclone separator and the isolation screen, effectively preventing particles from clogging the flow channel, ensuring a continuous and stable separation process, and reducing material loss.

[0051] 4. Efficient heat dissipation to cool materials.

[0052] The waste heat dissipation unit adopts a structural design that combines heat dissipation fins with auger conveying. The dried material carries the waste heat into the heat dissipation conveying cylinder and moves evenly under the drive of the auger. The waste heat is quickly dissipated through the heat dissipation fins on the outer wall, thereby cooling the material and preventing it from becoming damp or deteriorating due to the waste heat. Attached Figure Description

[0053] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0054] Figure 1 This is a schematic diagram of the overall external structure of the present invention in the main viewing direction;

[0055] Figure 2 This is a schematic diagram of the overall external structure of the present invention from a top-down perspective;

[0056] Figure 3 This is a schematic diagram of the overall external structure of the present invention from the left-side view direction;

[0057] Figure 4 This is a schematic diagram of the overall external structure of the present invention from the right-side view direction;

[0058] Figure 5 This is an isometric schematic diagram of the three-dimensional structure of the present invention;

[0059] Figure 6 For the present invention along Figure 2 A schematic diagram of the internal structure cut along line AA.

[0060] Figure 7 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the middle BB line;

[0061] Figure 8 For the present invention along Figure 1A schematic diagram of the internal structure cut along the CC line;

[0062] Figure 9 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the DD line in the middle;

[0063] Figure 10 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the EE line;

[0064] Figure 11 For the present invention along Figure 3 A partial half-section diagram of the section cut along the FF line.

[0065] In the diagram: 1-Main frame, 2-Feed box, 3-Feed support frame, 4-Feeding hopper, 5-Feed pipe, 6-Conveying atomizing cylinder, 7-Feeding conveyor motor, 8-Feeding conveyor auger, 9-Conveying air pump, 10-Airflow guide block, 11-Isolation plate, 12-Atomizing rotary motor, 13-Atomizing turntable, 14-Atomizer, 15-Support plate, 16-Compressed air pump, 17-Horizontal air inlet pipe, 18-Vertical air inlet pipe, 19-Air inlet shut-off valve, 20-Gas gathering hood, 21-Multi-stage drying tower, 22-Drying air inlet box, 23-Swirl air inlet, 24-T-type diverter pipe, 25-Drying fan, 26-Heating element, 27-Electronic flow valve, 28-Vertical sleeve, 29- Buffer plate, 30-Cross connecting frame, 31-Vertical central shaft, 32-Transfer air pump, 33-Horizontal transfer pipe, 34-Transfer shut-off valve, 35-Drying support frame, 36-Separation support frame, 37-Horizontal mounting plate, 38-Discharge port, 39-Separation tower, 40-Cyclone separator, 41-Spiral flow channel, 42-Conical guide seat, 43-Backflush air box, 44-Backflush air inlet, 45-Backflush blower, 46-Transfer pipe, 47-Exhaust pipe, 48-Exhaust valve, 49-Receiving hopper, 50-Material transfer box, 51-Material transfer pipe, 52-Heat dissipation conveying cylinder, 53-Discharge conveying motor, 54-Discharge conveying auger, 55-Discharge port, 56-Heat dissipation fins. Detailed Implementation

[0066] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0067] like Figures 1 to 11 As shown, the multi-stage integrated spray dryer includes a main frame 1, with the lower end of the main frame 1 grounded. The main frame 1 is equipped with a feeding atomization unit, a multi-stage drying unit, a gas-solid separation unit, and a waste heat dissipation unit.

[0068] The feeding atomization unit includes a feeding box 2, which is a closed square box. A feeding support frame 3 is welded to the lower end of the feeding box 2, and the lower end of the feeding support frame 3 is grounded.

[0069] A feeding hopper 4 connected to the upper surface of the feeding box 2 is fixed thereon, and a feeding pipe 5 is fixed on the inner top surface of the feeding box 2.

[0070] The feeding atomization unit also includes a horizontally arranged conveying atomizing cylinder 6. One end of the conveying atomizing cylinder 6 is fixed to and connected to the transverse end face of the feeding box 2, and the other end of the conveying atomizing cylinder 6 is closed and fixedly supported on the main frame 1.

[0071] A feeding conveyor motor 7 is fixed on the other side of the transverse end face of the feeding box 2. The output shaft of the feeding conveyor motor 7 passes through the side wall of the feeding box 2 and extends into its interior. A horizontal feeding conveyor auger 8 is fixed at the end of the output shaft of the feeding conveyor motor 7. The end of the feeding conveyor auger 8 extends into the conveying atomizing cylinder 6.

[0072] Each longitudinal outer end face of the feed box 2 is fixed with a conveying air pump 9, and an airflow guide block 10 is fixed on the inner bottom surface of the feed box 2. The airflow guide block 10 can change the direction of the opposing airflow, thereby blowing the material into the conveying atomizing cylinder 6.

[0073] An isolation plate 11 is provided on the upper surface of the airflow guide block 10, and the isolation plate 11 is fixedly clamped on the inner peripheral wall of the feed box 2.

[0074] An atomizing rotary motor 12 is fixed on the closed end face of the conveying atomizing cylinder 6. The atomizing rotary motor 12 is fixedly connected to a horizontal coupling shaft. An atomizing turntable 13 is fixed at the end of the horizontal coupling shaft. The atomizing turntable 13 is located close to the end of the feeding conveying auger 8. The outer peripheral wall of the atomizing turntable 13 is tightly attached to the inner peripheral wall of the conveying atomizing cylinder 6. Several centrally symmetrical atomizers 14 are fixed on the atomizing turntable 13.

[0075] A support plate 15 is fixed on the main frame 1. A compressed air pump 16 is fixed on the upper surface of the support plate 15. A horizontal air inlet pipe 17 is fixedly connected to one side of the compressed air pump 16. Three vertical air inlet pipes 18 are fixedly connected to the horizontal air inlet pipe 17. The upper end of the vertical air inlet pipes 18 is fixedly connected to the front half of the conveying atomizing cylinder 6. Each vertical air inlet pipe 18 is equipped with an air inlet shut-off valve 19. The compressed air entering the conveying atomizing cylinder 6 through the horizontal air inlet pipe 17 and the vertical air inlet pipes 18 can perform secondary pneumatic conveying of the material conveyed by the feeding conveying auger 8, forcing it to pass through the atomizer 14 to form atomized particles.

[0076] A concentrator 20 is fixedly connected to the other side of the compressed air pump 16. The upper end of the concentrator 20 is fixedly connected to the rear half of the conveying atomizing cylinder 6. The compressed air entering the conveying atomizing cylinder 6 through the concentrator 20 can continuously lift the atomized particles upward.

[0077] The multi-stage drying unit includes a multi-stage drying tower 21. The lower end of the multi-stage drying tower 21 is fixedly connected to the conveying atomizing cylinder 6. The multi-stage drying tower 21 is positioned directly opposite the gas gathering hood 20. The inner cavity of the multi-stage drying tower 21 is divided into three sections from bottom to top, and each section is equipped with an independent drying mechanism.

[0078] Each drying unit includes a drying air inlet box 22, which is fixed on the outer peripheral wall of the multi-stage drying tower 21. Several centrally symmetrical swirl air inlets 23 are opened on the inner peripheral wall of the multi-stage drying tower 21 corresponding to each drying air inlet box 22. An isolation net is fixed in each swirl air inlet 23. The swirl air inlet 23 is used to connect the multi-stage drying tower 21 and the drying air inlet box 22.

[0079] The air intake directions of the two adjacent drying air inlet boxes 22 are opposite.

[0080] Three drying air inlet boxes 22 are fixed with T-shaped diversion pipes 24 on the outside of the air inlet end. A drying fan 25 is fixed on the longitudinal outer wall at the intersection of the T-shaped diversion pipes 24. Each branch of the T-shaped diversion pipe 24 is equipped with an electric heating element 26. An electronic flow valve 27 is provided at the connection between the T-shaped diversion pipe 24 and each drying air inlet box 22.

[0081] Each drying unit also includes a cyclone buffer, which includes a vertical sleeve 28. Several centrally symmetrical buffer plates 29 are welded to the outer peripheral wall of the vertical sleeve 28. The ends of the buffer plates 29 are set close to the inner peripheral wall of the multi-stage drying tower 21.

[0082] A cross-shaped connecting frame 30 is fixed on the inner peripheral wall of the multi-stage drying tower 21 near the upper and lower ends. A vertical central shaft 31 is fixed between two cross-shaped connecting frames 30. Three vertical sleeves 28 are rotatably fitted on the vertical central shaft 31.

[0083] The upper end of the multi-stage drying tower 21 is equipped with a transfer air pump 32, which is fixedly connected to a transverse transfer pipe 33, and a transfer shut-off valve 34 is provided on the transverse transfer pipe 33.

[0084] A drying support frame 35 is welded onto the main frame 1, and the multi-stage drying tower 21 is fixedly mounted on the drying support frame 35.

[0085] A separation support frame 36 is also welded onto the main frame 1. A horizontal mounting plate 37 is welded to the upper end of the separation support frame 36. A material discharge port 38 is opened in the middle of the upper surface of the horizontal mounting plate 37.

[0086] The gas-solid separation unit includes a separation tower 39, the lower end of which is fixed on a horizontal mounting plate 37 and connected to a discharge port 38.

[0087] The separation tower 39 is equipped with a cyclone separator 40, which is a cone that gradually narrows from top to bottom, and a spiral flow channel 41 is opened on the cone surface of the cyclone separator 40.

[0088] A conical guide seat 42 is fixed on the upper surface of the cyclone separator 40.

[0089] A back-blowing air inlet box 43 is fixed on the outer peripheral wall near the lower end of the separation tower 39. Several back-blowing air inlets 44 are opened on the inner peripheral wall of the separation tower 39. The back-blowing air inlets 44 are connected to the back-blowing air inlet box 43. An isolation net is also fixed in each back-blowing air inlet 44.

[0090] A back-blowing fan 45 is provided on the back-blowing air inlet box 43.

[0091] A transfer pipe 46 is fixed at the upper end of the separation tower 39, and the end of the transverse transfer pipe 33 is fixedly connected to the transfer pipe 46. An exhaust pipe 47 is connected to the upper end of the transfer pipe 46, and an exhaust valve 48 is provided on the exhaust pipe 47.

[0092] A receiving hopper 49 is fixed in the middle of the lower surface of the horizontal mounting plate 37, and a material transfer box 50 is fixed at the lower end of the receiving hopper 49. The material transfer box 50 is provided with a glass observation window.

[0093] The lower end of the material transfer box 50 is fixedly connected to the material transfer pipe 51.

[0094] The waste heat dissipation unit includes a horizontal heat dissipation conveying cylinder 52, and the end of the material transfer pipe 51 is fixedly connected to the heat dissipation conveying cylinder 52.

[0095] The heat dissipation conveying cylinder 52 is located on the transverse side of the separation support frame 36, and the heat dissipation conveying cylinder 52 extends longitudinally.

[0096] A discharge conveyor motor 53 is fixed on the rear end face of the heat dissipation conveyor cylinder 52. The output shaft end of the discharge conveyor motor 53 passes through the side wall of the heat dissipation conveyor cylinder 52 and is fixed with a discharge conveyor auger 54.

[0097] A discharge port 55 is provided on the front end face of the heat dissipation conveying cylinder 52.

[0098] Heat dissipation fins 56 are fixed on the outer peripheral wall of the heat dissipation delivery cylinder 52.

[0099] When using this invention:

[0100] First, the material to be dried is fed into the closed feed box 2 through the feeding hopper 4 at the top of the feed box 2. After the material falls to the bottom of the feed box 2, the feeding conveying motor 7 is started, which drives the feeding conveying auger 8 at the end of its output shaft to rotate, and the material is horizontally conveyed into the conveying atomizing cylinder 6.

[0101] At the same time, the conveying air pumps 9 on both sides of the feed box 2 start synchronously, and introduce airflow into the box. After the airflow changes direction through the airflow guide block 10 on the bottom surface of the feed box 2, it forms a counter-blowing airflow, which further blows the material in the feed box 2 onto the conveying path of the feeding conveying auger 8, ensuring that no material residue enters the conveying atomizing cylinder 6.

[0102] After the compressed air pump 16 starts, it outputs compressed air in two ways: one way is to be transported to the first half of the conveying atomizing cylinder 6 through the horizontal air inlet pipe 17 and the vertical air inlet pipe 18. The air intake is precisely controlled by the air intake shut-off valve 19. The compressed air performs secondary pneumatic conveying of the material conveyed by the feeding conveying auger 8, forcing the material to pass through several centrally symmetrical atomizers 14 on the atomizing turntable 13 and break it into fine atomized particles; the other way is to be transported to the second half of the conveying atomizing cylinder 6 through the air gathering hood 20, continuously lifting the atomized particles upwards and providing power for the particles to enter the multi-stage drying tower 21.

[0103] During this process, the atomizing motor 12 drives the horizontal coupling and the atomizing turntable 13 to rotate synchronously. The outer peripheral wall of the atomizing turntable 13 is in close contact with the inner wall of the conveying atomizing cylinder 6, ensuring that the material fully contacts the atomizer 14 and improving the uniformity of atomization.

[0104] After the atomized particles enter the multi-stage drying tower 21 with the airflow, the drying fan 25 starts. The outside air is divided by the T-shaped diverter 24 and forms hot air under the heating action of the heating elements 26 in each branch. The electronic flow valve 27 adjusts the hot air volume of each branch according to the drying requirements. The hot air enters the three drying air inlet boxes 22 respectively, and then enters the tower in a swirling state through the swirling air inlet 23 on the inner wall of the multi-stage drying tower 21.

[0105] Since the air inlet directions of adjacent drying air inlet boxes 22 are opposite, the hot air forms an interlaced swirling flow field in the multi-stage drying tower 21, which fully contacts the atomized particles. At the same time, the three vertical sleeves 28 on the vertical central axis 31 inside the tower rotate with the airflow, and the rotating buffer plate 29 is used to slow down the rising speed of the particles and prolong the residence time of the particles in the tower.

[0106] The atomized particles pass through the three drying chambers of the multi-stage drying tower 21 in sequence. Under the step-by-step drying action, the moisture is gradually removed. After drying, the gas-solid mixture is transported to the gas-solid separation unit through the transverse transfer pipe 33 and the transfer stop valve 34 under the negative pressure suction action of the transfer air pump 32.

[0107] The gas-solid mixture enters the separation tower 39 through the transfer pipe 46, and after being guided by the conical guide seat 42 inside the tower, it enters the cyclone separator 40, which gradually narrows from top to bottom.

[0108] The gas-solid mixture rotates at high speed in the spiral flow channel 41 of the cone surface of the cyclone separator 40. Under the action of centrifugal force, the solid dry particles are thrown towards the inner wall of the cyclone separator 40, fall down along the wall, enter the receiving hopper 49 through the discharge port 38 of the horizontal mounting plate 37, and finally collect in the material transfer box 50. The operator can monitor the material storage volume in real time through the glass observation window of the material transfer box 50.

[0109] To prevent solid particles from clogging the spiral flow channel 41 and the isolation screen, the back-blowing blower 45 continuously introduces airflow into the back-blowing inlet box 43. The airflow enters the separation tower 39 through the back-blowing inlet 44 to back-blow and clean the inner wall of the separator and the isolation screen. The exhaust gas after gas-solid separation is discharged through the exhaust pipe 47 and exhaust valve 48 at the top of the separation tower 39.

[0110] The dried material in the material transfer box 50 enters the horizontal heat dissipation conveying cylinder 52 through the material transfer pipe 51. The discharge conveying motor 53 drives the discharge conveying auger 54 to rotate, causing the material to move longitudinally inside the cylinder.

[0111] The residual heat carried by the material is quickly dissipated to the external environment through the heat dissipation fins 56 on the outer periphery of the heat dissipation conveying cylinder 52, thereby cooling the material. Finally, the cooled finished material is discharged through the discharge port 55 on the front side of the heat dissipation conveying cylinder 52, completing the entire drying process.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A multi-stage drying integrated spray dryer characterized by: It includes a main frame, the lower end of which is grounded, and the main frame is respectively equipped with a feeding atomization unit, a multi-stage drying unit, a gas-solid separation unit and a waste heat dissipation unit; The feeding atomization unit includes a horizontal conveying atomization cylinder, inside which is a feeding conveying auger. An atomization turntable is rotatably mounted on one side of the feeding conveying auger, and several centrally symmetrical atomizers are fixed on the atomization turntable. The multi-stage drying unit includes a multi-stage drying tower. The lower end of the multi-stage drying tower is fixedly connected to the conveying atomizing cylinder. The inner cavity of the multi-stage drying tower is divided into three sections from bottom to top, and each section is equipped with an independent drying mechanism. Each drying mechanism includes a drying air inlet box, which is fixed on the outer peripheral wall of the multi-stage drying tower. Several centrally symmetrical swirl air inlets are opened on the inner peripheral wall of the multi-stage drying tower corresponding to each drying air inlet box, and an isolation net is fixed in each swirl air inlet. The air inlet vortexes of two adjacent drying air inlet boxes are opposite; A T-shaped diversion pipe is fixed to the outer side of the air inlet end of each of the three drying air inlet boxes. A drying fan is fixed to the longitudinal outer wall at the intersection of the T-shaped diversion pipes. Each branch of the T-shaped diversion pipe is equipped with an electric heating element. An electronic flow valve is provided at the connection between the T-shaped diversion pipe and each of the drying air inlet boxes. Each set of drying mechanisms also includes a vortex buffer; An atomizing rotating motor is fixed on the closed end face of the conveying atomizing cylinder. The atomizing rotating motor is fixedly connected to a horizontal connecting shaft. The end of the horizontal connecting shaft is fixed to the atomizing turntable. The outer peripheral wall of the atomizing turntable is set close to the inner peripheral wall of the conveying atomizing cylinder. The atomizing turntable rotates at high speed with the atomizing rotating motor, and its outer peripheral wall is close to the inner wall of the conveying atomizing cylinder, forming a secondary shearing of the material. A support plate is fixed on the main frame. A compressed air pump is fixed on the upper surface of the support plate. A horizontal air inlet pipe is fixedly connected to one side of the compressed air pump. Three vertical air inlet pipes are fixedly connected to the horizontal air inlet pipe. The upper end of the vertical air inlet pipe is fixedly connected to the front half of the conveying atomizing cylinder. Each vertical air inlet pipe is equipped with an air inlet shut-off valve. A gas-gathering hood is fixedly connected to the other side of the compressed air pump, and the upper end of the gas-gathering hood is fixedly connected to the rear half of the conveying atomizing cylinder.

2. The multi-stage drying integrated spray dryer of claim 1, wherein: The feeding atomizing unit also includes a feeding box, which is a closed square box. A feeding support frame is welded to the lower end face of the feeding box, and the lower end of the feeding support frame is grounded. A feeding hopper connected to the upper surface of the feeding box is fixed thereto, and a feeding pipe is fixed on the inner top surface of the feeding box; One end of the conveying atomizing cylinder is fixed to and communicates with the transverse end face of the feed box, and the other end of the conveying atomizing cylinder is closed and fixedly supported on the main frame. A feeding conveyor motor is fixed on the other side of the transverse end face of the feeding box. The end of the output shaft of the feeding conveyor motor extends into the inside of the feeding box and is fixed to the end of the feeding conveyor auger. A conveying air pump is fixed on each longitudinal outer end face of the feeding box, and an airflow guide block is fixed on the inner bottom surface of the feeding box. The upper surface of the airflow guide block is provided with an isolation plate, which is fixedly fastened to the inner peripheral wall of the feed box.

3. The multi-stage drying integrated spray dryer of claim 1, wherein: The cyclone buffer includes a vertical sleeve, and several centrally symmetrical buffer plates are welded to the outer peripheral wall of the vertical sleeve. The ends of the buffer plates are set close to the inner peripheral wall of the multi-stage drying tower. The multi-stage drying tower has cross-shaped connecting frames fixed on its inner circumferential walls near the top and bottom ends. A vertical central shaft is fixed between two of the cross-shaped connecting frames, and three vertical sleeves are rotatably fitted onto the vertical central shaft.

4. The multi-stage drying integrated spray dryer of claim 1, wherein: The upper end of the multi-stage drying tower is equipped with a transfer air pump, which is fixedly connected to a transverse transfer pipe, and the transverse transfer pipe is equipped with a transfer shut-off valve.

5. The multi-stage integrated spray dryer according to claim 4, characterized in that: A drying support frame is welded onto the main frame, and the multi-stage drying tower is fixedly mounted on the drying support frame. A separation support frame is also welded onto the main frame. A horizontal mounting plate is welded to the upper end of the separation support frame, and a material discharge port is opened in the middle of the upper surface of the horizontal mounting plate.

6. The multi-stage drying integrated spray dryer of claim 5, wherein: The gas-solid separation unit includes a separation tower, the lower end of which is fixed to the horizontal mounting plate and connected to the discharge port. The separation tower is equipped with a cyclone separator, which is a cone that tapers from top to bottom, and a spiral flow channel is formed on the cone surface of the cyclone separator; A conical guide seat is fixed on the upper surface of the cyclone separator; A backflush air inlet box is fixed on the outer peripheral wall near the lower end of the separation tower. Several backflush air inlets are opened on the inner peripheral wall of the separation tower. The backflush air inlets are connected to the backflush air inlet box. An isolation net is also fixed in each of the backflush air inlets. The back-blowing air inlet box is equipped with a back-blowing air blower; The upper end of the separation tower is fixed with a transfer pipe, the end of the transverse transfer pipe is fixedly connected to the transfer pipe, the upper end of the transfer pipe is connected to an exhaust pipe, and an exhaust valve is provided on the exhaust pipe.

7. The multi-stage drying integrated spray dryer of claim 5, wherein: A material receiving hopper is fixed to the middle of the lower surface of the horizontal mounting plate, and a material transfer box is fixed to the lower end of the material receiving hopper. The material transfer box is provided with a glass observation window. The lower end of the material transfer box is fixedly connected to a material transfer pipe.

8. The multi-stage drying integrated spray dryer of claim 7, wherein: The waste heat dissipation unit includes a horizontal heat dissipation conveying cylinder, and the end of the material transfer pipe is fixedly connected to the heat dissipation conveying cylinder; The heat dissipation conveying cylinder is located on one side of the separation support frame, and the heat dissipation conveying cylinder extends longitudinally. A discharge conveying motor is fixed on the rear end face of the heat dissipation conveying cylinder, and the output shaft end of the discharge conveying motor passes through the side wall of the heat dissipation conveying cylinder and is fixed with a discharge conveying auger. A discharge port is provided on the front end face of the heat dissipation conveying cylinder; The heat dissipation conveying cylinder has heat dissipation fins fixed on its outer peripheral wall.

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