A powder drying device and method for pea starch production

Abstract

The present invention discloses a powder drying device and method for pea starch production, which relates to the technical field of powder drying. The present invention includes a hot air furnace and a cyclone separator. An air outlet pipe is arranged at the outlet of the hot air furnace, and a connecting pipe is arranged at the air inlet end of the cyclone separator. A drying pipe is rotatably installed between the air outlet pipe and the connecting pipe. A spiral filter is arranged on the outer side of the drying pipe. A plurality of sliding openings are formed on the outer side of the drying pipe. A pre-drying cylinder is sleeved on the outer side of the drying pipe. Through the filtration of the spiral filter, water remains below, and starch is conveyed upward. The starch is conveyed from above to a starch chamber for secondary drying, so that the water content of the starch can be controlled at 35%-40%. Then the starch is sprayed into the air outlet pipe by high-pressure gas and dried in the drying pipe along with the hot air. There is no need to additionally use dehydration equipment, screw conveying equipment and dispersing equipment, and the integration degree of the equipment is high and the structure is compact.

Description

Technical Field

[0001] The present invention relates to the technical field of powder drying, and particularly relates to a powder drying device and method for pea starch production. Background Art

[0002] In the production process of pea starch, dehydration and drying are one of the key links. Traditional pea starch drying methods mainly include natural sun drying, spray drying, drum drying, etc. Among them, flash drying is widely used due to its high efficiency. Flash drying mainly uses the flow of hot air to quickly dry the pea starch slurry.

[0003] In a Chinese patent (publication number: CN219103619U), a flash-type powder drying and collecting device is disclosed, including a screw feeder, a hot blast stove, a feeding pipe, an aggregate pipe, a cyclone separator, a distribution pipe, an electric valve, a drying pipe and a controller. The feeding pipe is a tee pipe, and two feeding ports are respectively connected to the discharge port of the screw feeder and the air outlet of the hot blast stove, and the discharge port is connected to the feeding port of the aggregate pipe. The discharge port of the aggregate pipe is connected to the feeding port of the screw feeder through a wavy drying pipe. The distribution pipe is a tee pipe, and the feeding port is connected to the discharge port of the screw feeder, and electric valves are respectively installed at two air outlets. One of the discharge ports of the distribution pipe is connected to the return port of the aggregate pipe through an extension pipe. The screw feeder, the hot blast stove, the cyclone separator and the electric valve are respectively electrically connected to the controller. The following technical problems exist in the actual use process of this patent and the prior art:

[0004] 1. When drying starch with this patent and existing powder flash drying equipment, it is necessary to dehydrate the starch slurry. Mainly use a vacuum dehydrator to control the water content of the starch at 35%-40%, and then the powder flash drying equipment can be used for drying. Moreover, the dehydrated starch needs to be transported to the drying equipment by a screw conveyor and a dispersing device, with a complex process and low equipment integration.

[0005] 2. After the cyclone separator separates the starch from the hot air, the hot air is directly discharged, which not only wastes energy, but also the hot air will carry out some starch. It is also necessary to use additional dust treatment equipment to recover the dust from the discharged hot air, with low energy utilization rate and waste of starch. Summary of the Invention

[0006] The purpose of the present invention is: to solve the above problems, the present invention provides a powder drying device and method for pea starch production.

[0007] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0008] A powder drying device for pea starch production, comprising a hot blast stove and a cyclone separator. An air outlet pipe is arranged at the outlet of the hot blast stove, and a connecting pipe is arranged at the air inlet end of the cyclone separator. A drying pipe is rotatably installed between the air outlet pipe and the connecting pipe. A spiral filter is arranged on the outer side of the drying pipe. A plurality of sliding openings are formed on the outer side of the drying pipe, and a sealing sliding piece is slidably connected inside the sliding opening. A dispersing wheel is rotatably installed on the outer side of the sealing sliding piece.

[0009] A pre-drying cylinder is sleeved on the outer side of the drying pipe. A water removal cavity and a starch cavity are formed inside the pre-drying cylinder from the inside to the outside. The top of the water removal cavity is communicated with that of the starch cavity. A drain pipe is arranged at the bottom of the water removal cavity. The starch cavity is communicated with the air outlet pipe through a starch pipe. A slurry inlet pipe is arranged on the outer side of the water removal cavity. A compressor is installed at the air outlet end of the cyclone separator. The compressor is communicated with the pre-drying cylinder through a high-pressure air pipe.

[0010] Further, the bottom end of the pre-drying cylinder is designed to be inclined.

[0011] Further, a dispersion ring is arranged on the inner wall of the starch cavity, and the dispersion ring is designed to be inclined downward.

[0012] Further, an upper baffle is arranged at the top end of the spiral filter, and the upper baffle extends into the starch cavity.

[0013] Further, a reset elastic cord is arranged between the sealing sliding piece and the inner wall of the sliding opening. A driving sprocket and a driven sprocket are rotatably installed inside the drying pipe. An impeller is fixedly installed on the outer side of the driving sprocket. The driving sprocket and the driven sprocket are connected by a transmission chain. A dial rod is fixedly installed on the outer side of the transmission chain. A dial shaft is fixedly installed on the side of the dispersing wheel close to the inside of the drying pipe. The axes of the driving sprocket and the driven sprocket are on the same horizontal plane.

[0014] Further, a toothed rod is arranged on the inner wall of the drying pipe. A transmission gear is fixedly installed on the outer side of the dial shaft, and the transmission gear meshes with the toothed rod.

[0015] Further, a partition plate is arranged inside the drying pipe. A sealed cavity is formed between the partition plate and the inner wall of the drying pipe. The driving sprocket, the driven sprocket and the dial shaft are all located in the sealed cavity, and the impeller is located outside the partition plate.

[0016] Further, a guide vane is arranged on the outer side of the partition plate, and the guide vane is arranged corresponding to the impeller.

[0017] Furthermore, a driving motor is fixedly installed on the outer side of the air outlet pipe. The output end of the driving motor is fixedly installed with a driving wheel. A transmission toothed ring is fixedly installed on the outer side of the bottom end of the drying pipe. The transmission toothed ring meshes with the driving wheel. The radius of the driving wheel is smaller than the maximum radius of the transmission toothed ring. A pressure sensor is arranged at the top of the pre-drying cylinder. Solenoid valves are installed on both the starch pipe and the drain pipe. The pressure sensor is electrically connected to the solenoid valves through a controller.

[0018] A method for drying powder used in pea starch production includes the following steps:

[0019] S1. Dehydration: Inject the starch slurry into the water removal chamber through the feed pipe. The hot blast stove sends hot air into the drying pipe, and then enters the pre-drying cylinder under high pressure through the cyclone separator and the compressor. At the same time, the drying pipe conveys the slurry upward along the water removal chamber through the spiral filter. Under the conditions of a temperature of 100°C - 120°C and a pressure of 100 - 110 kPa, the starch slurry is pre-dried to make the water content of the starch 35% - 40%.

[0020] S2. Drying: The high-pressure air inside the pre-drying cylinder sprays the pre-treated starch into the air outlet pipe. The starch is sent into the drying pipe with the hot air cup for drying, and then is collected through the cyclone separator.

[0021] The beneficial effects of the present invention are as follows:

[0022] Through the settings of the pre-drying cylinder and the spiral filter, the present invention conveys the starch upward under high temperature and high pressure. Through the filtration of the spiral filter, the water remains below, and the starch is conveyed upward. The starch is conveyed from above to the starch chamber for secondary drying, so that the water content of the starch can be controlled at 35% - 40%. Then the starch is sprayed into the air outlet pipe by high-pressure gas and enters the drying pipe with the hot air for drying. There is no need to use additional dehydration equipment, spiral conveying equipment and dispersing equipment. The integration degree of the equipment is high and the structure is compact.

[0023] By arranging the pre-drying cylinder outside the drying pipe, the present invention can absorb the excess heat of the drying pipe. Then the compressor compresses the hot air separated by the cyclone separator into the pre-drying cylinder, so that the heat in the hot air dries and dehydrates the starch, and the starch powder in the hot air is filtered into the starch, which can make full use of the waste heat of the equipment and prevent starch waste.

[0024] Through the settings of multiple groups of dispersing wheels, the present invention can disperse the agglomerated starch on the spiral filter, improve the starch dehydration efficiency, and ensure that the starch can be stably conveyed upward with good dehydration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic cross-sectional structure diagram of the pre-drying cylinder of the present invention;

[0027] Figure 3 It is a schematic structure diagram of the drying pipe of the present invention;

[0028] Figure 4 It is a schematic cross-sectional structure diagram of the drying pipe of the present invention;

[0029] Figure 5 It is a schematic structure diagram of the driving structure of the sealing slide plate and the dispersing wheel of the present invention;

[0030] Figure 6 It is a schematic structure diagram of the sliding port of the drying pipe of the present invention.

[0031] Reference numerals: 1, hot blast stove; 2, air outlet pipe; 21, driving motor; 22, driving wheel; 3, drying pipe; 31, spiral filter; 32, upper baffle; 33, transmission gear ring; 34, sliding port; 35, sealing slide plate; 36, reset elastic cord; 37, dispersing wheel; 38, dial shaft; 39, transmission gear; 310, rack; 311, impeller; 312, driving sprocket; 313, driven sprocket; 314, transmission chain; 315, dial rod; 316, partition board; 317, guide vane; 4, connecting pipe; 5, cyclone separator; 6, compressor; 7, high-pressure air pipe; 8, pre-drying cylinder; 81, water removal chamber; 82, starch chamber; 83, dispersion ring; 84, slurry inlet pipe; 9, starch pipe; 10, drain pipe; 11, solenoid valve. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] Example 1, as Figures 1-6 shown, a powder drying device for pea starch production includes a hot blast stove 1 and a cyclone separator 5. An air outlet pipe 2 is provided at the outlet of the hot blast stove 1, and a connecting pipe 4 is provided at the air inlet end of the cyclone separator 5. A drying pipe 3 is rotatably installed between the air outlet pipe 2 and the connecting pipe 4. A spiral filter 31 is provided on the outer side of the drying pipe 3, and a plurality of sliding ports 34 are provided on the outer side of the drying pipe 3. A sealing slide plate 35 is slidably connected inside the sliding port 34. A dispersing wheel 37 is rotatably installed on the outer side of the sealing slide plate 35. Both the sliding port 34 and the sealing slide plate 35 are of a spiral design, and the spiral pitch is the same as that of the spiral filter 31. Therefore, the dispersing wheel 37 can roll up and down along the upper surface of the spiral filter 31 to disperse the starch;

[0034] A pre-drying cylinder 8 is sleeved outside the drying pipe 3. An inner water removal chamber 81 and a starch chamber 82 are formed inside the pre-drying cylinder 8 from inside to outside. The top of the water removal chamber 81 is communicated with that of the starch chamber 82. A drain pipe 10 is arranged at the bottom of the water removal chamber 81. The starch chamber 82 is communicated with the air outlet pipe 2 through a starch pipe 9. An inlet slurry pipe 84 is arranged outside the water removal chamber 81. An air compressor 6 is installed at the air outlet end of the cyclone separator 5. The air compressor 6 is communicated with the pre-drying cylinder 8 through a high-pressure air pipe 7.

[0035] Furthermore, a driving motor 21 is fixedly installed outside the air outlet pipe 2. A driving wheel 22 is fixedly installed at the output end of the driving motor 21. A transmission gear ring 33 is fixedly installed outside the bottom end of the drying pipe 3. The transmission gear ring 33 is engaged with the driving wheel 22. The radius of the driving wheel 22 is smaller than the maximum radius of the transmission gear ring 33. Through this design, the rotation speed of the drying pipe 3 can be reduced. A pressure sensor is arranged at the top of the pre-drying cylinder 8. Solenoid valves 11 are installed on both the starch pipe 9 and the drain pipe 10. The pressure sensor is electrically connected to the solenoid valve 11 through a controller.

[0036] The device starts up. The hot blast stove 1 sends hot air into the drying pipe 3 through the air outlet pipe 2, then enters the cyclone separator 5 through the connecting pipe 4, and then enters the pre-drying cylinder 8 through the compressor 6 and the high-pressure air pipe 7. At the same time, the pea starch slurry enters the water removal chamber 81 through the slurry inlet pipe 84. At this time, the driving motor 21 is powered on, the driving motor 21 drives the driving wheel 22 to rotate, the driving wheel 22 drives the transmission gear ring 33 to rotate, the transmission gear ring 33 drives the drying pipe 3 to rotate, and the drying pipe 3 drives the spiral filter 31 to rotate. At this time, the starch is filtered under the adjustment of high temperature and high pressure. The starch remains on the upper surface of the spiral filter 31, and the separated water remains at the bottom of the water removal chamber 81. Since the starch has a high viscosity, it will agglomerate on the spiral filter 31. Therefore, during the filtering process, the sealing slide 35 is controlled to slide up and down, and the sealing slide 35 drives the dispersing wheel 37 to roll up and down along the spiral filter 31 to break up the agglomerated starch on its surface. The dehydrated efficiency of the broken-up starch is higher, and it can ensure that the starch is conveyed upward. When the air pressure in the pre-drying cylinder 8 reaches the preset value, through the feedback of the pressure sensor, the controller controls the solenoid valve 11 to open. The solenoid valve 11 opens the drain pipe 10, and the water filtered at the bottom is carried out by the high-pressure gas. The drainage efficiency is high. After draining for a period of time, the solenoid valve 11 closes. During the drainage process, the air flow in the water removal chamber 81 will flow rapidly, which can further improve the starch separation efficiency. The dehydrated starch is lifted to the top of the water removal chamber 81 through the spiral filter 31, and then freely falls into the starch chamber 82. When the solenoid valve 11 is opened, the starch pipe 9 is opened, and the dehydrated starch in the starch chamber 82 is carried into the air outlet pipe 2 by the high-pressure gas. Under the action of the high-pressure air flow, the large agglomerated starch is directly broken up, and the small agglomerated starch will also be broken up when it impacts the inner wall of the air outlet pipe 2. Therefore, the starch will be evenly carried into the drying pipe 3 by the hot air. The dehydrated starch is dried, and the dried starch enters the cyclone separator 5 for separation. The separated hot air is continuously compressed by the compressor 6 and then enters the pre-drying cylinder 8, so that the hot air continuously circulates in the device. The starch remaining in the hot air will be re-fused into the dehydrated starch again, without causing starch waste.

[0037] The dehydration structure of the present invention is arranged outside the drying pipe 3, which can make full use of the waste heat of the drying pipe 3 and the waste heat of the tail gas, with high energy utilization rate, and the device is integrally formed, simplifying the drying process of pea starch powder.

[0038] Embodiment 2, on the basis of the above embodiment, further includes that the bottom end of the pre-drying cylinder 8 is inclined. Through this design, the starch can be concentrated at the position of the starch pipe 9, and the filtered water can be concentrated at the position of the drain pipe 10, and the discharging effect of starch and water is better.

[0039] Embodiment three, on the basis of the above embodiment, further includes: the inner wall of the starch chamber 82 is provided with a dispersion ring 83, and the dispersion ring 83 is designed to be inclined downward. Through the setting of the dispersion ring 83, the starch discharged from the dewatering chamber 81 can be repeatedly dropped on the dispersion ring 83, and further broken up and dried to reduce the water content, and when the solenoid valve 11 is opened, the airflow will accelerate the falling of the starch to ensure that the starch will not remain on the dispersion ring 83, and the drying effect is better.

[0040] Embodiment 4, based on the above embodiment, further includes that an upper baffle 32 is provided at the top of the spiral filter 31, and the upper baffle 32 extends into the starch cavity 82. Through the setting of the upper baffle 32, the starch can be better guided into the starch cavity 82.

[0041] Embodiment 5, on the basis of the above embodiments, further includes: a reset elastic rope 36 is arranged between the sealing slide 35 and the inner wall of the sliding port 34, a driving sprocket 312 and a driven sprocket 313 are rotatably installed inside the drying tube 3, an impeller 311 is fixedly installed on the outer side of the driving sprocket 312, the driving sprocket 312 and the driven sprocket 313 are connected by a transmission chain 314, a shifting rod 315 is fixedly installed on the outer side of the transmission chain 314, a shifting shaft 38 is fixedly installed on the side of the breaking wheel 37 close to the inside of the drying tube 3, and the axes of the driving sprocket 312 and the driven sprocket 313 are on the same horizontal plane.

[0042] Furthermore, a gear rod 310 is provided on the inner wall of the drying tube 3 , and a transmission gear 39 is fixedly mounted on the outer side of the shifting shaft 38 , and the transmission gear 39 is meshed with the gear rod 310 .

[0043] The airflow in the drying tube 3 rises, and the airflow drives the impeller 311 to rotate, and the impeller 311 drives the driving sprocket 312 to rotate, and the driving sprocket 312 drives the lever 315 to rotate, and the lever 315 drives the sealing slide 35 to slide upward along the sliding port 34 through the lever shaft 38. It should be noted that both ends of the sliding port 34 are provided with a storage cavity, so the length of the sealing slide 35 is set to be much larger than the length of the sliding port 34. When the sealing slide 35 slides, the sliding port 34 will not open, ensuring stable drying. Since the sliding port 34 is spirally upward, the axes of the driving sprocket 312 and the driven sprocket 313 are on the same On the horizontal plane, as the sealing slide 35 slides upward, the dial shaft 38 will rise relative to the dial rod 315. When the sealing slide 35 slides to the highest point, the dial rod 315 disengages from the dial shaft 38, and the sealing slide 35 slides downward and resets under the action of the reset elastic rope 36. Therefore, as the impeller 311 continues to rotate, the sealing slide 35 drives the breaking wheel 37 to move up and down along the upper surface of the spiral filter 31. At the same time, the breaking wheel 37 rotates under the action of the transmission gear 39 and the gear rod 310. It should be noted that the rotation speed of the breaking wheel 37 is relatively high, which can better break up the starch and has a high dehydration efficiency.

[0044] With the arrangement of this embodiment, there is no need to set up an additional drive. The drying air flow is used to drive the sealing slide vane 35 and the dispersing wheel 37, and the structure is compact.

[0045] Embodiment 6, on the basis of the above embodiment, further includes that a partition 316 is arranged inside the drying pipe 3. A sealed cavity is formed between the partition 316 and the inner wall of the drying pipe 3. The driving sprocket 312, the driven sprocket 313 and the shifting shaft 38 are all located in the sealed cavity, and the impeller 311 is located outside the partition 316.

[0046] Furthermore, guide vanes 317 are arranged outside the partition 316, and the guide vanes 317 are arranged corresponding to the impeller 311.

[0047] Through the arrangement of the partition 316, it can prevent the dry starch from adhering to structures such as the driving sprocket 312, the driven sprocket 313 and the shifting shaft 38, and will not cause starch waste. Through the arrangement of the guide vanes 317, the air flow on one side of the impeller 311 can be blocked, so as to achieve the effect of the rotation direction of the impeller 311.

[0048] Embodiment 7, a method for drying powder used in pea starch production, includes the following steps:

[0049] S1. Dehydration: Inject the starch slurry into the water removal chamber 81 through the feed pipe 84. The hot blast stove 1 sends hot air into the drying pipe 3, and then enters the pre-drying cylinder 8 under high pressure through the cyclone separator 5 and the compressor 6. At the same time, the drying pipe 3 conveys the slurry upward along the water removal chamber 81 through the spiral filter 31. Under the conditions of a temperature of 100°C - 120°C and a pressure of 100 - 110 kPa, the starch slurry is pre-dried so that the water content of the starch is 35% - 40%.

[0050] S2. Drying: The high-pressure air pressure inside the pre-drying cylinder 8 sprays the pre-treated starch into the air outlet pipe 2. The starch is sent into the drying pipe 3 with the hot air cup for drying, and then is collected through the cyclone separator 5.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A powder drying device for pea starch production, comprising a hot blast stove (1) and a cyclone separator (5), characterized in that, An air outlet pipe (2) is arranged at the outlet of the hot blast stove (1). A connecting pipe (4) is arranged at the air inlet end of the cyclone separator (5). A drying pipe (3) is rotatably installed between the air outlet pipe (2) and the connecting pipe (4). A spiral filter (31) is arranged on the outer side of the drying pipe (3). A plurality of sliding openings (34) are formed in the outer side of the drying pipe (3). A sealing sliding piece (35) is slidably connected inside the sliding opening (34). A dispersing wheel (37) is rotatably installed on the outer side of the sealing sliding piece (35). A pre-drying cylinder (8) is sleeved on the outer side of the drying pipe (3). An aqueous cavity (81) and a starch cavity (82) are formed in the pre-drying cylinder (8) from the inside to the outside. The top ends of the aqueous cavity (81) and the starch cavity (82) are communicated. A drain pipe (10) is arranged at the bottom of the aqueous cavity (81). The starch cavity (82) is communicated with the air outlet pipe (2) through a starch pipe (9). A slurry inlet pipe (84) is arranged on the outer side of the aqueous cavity (81). A compressor (6) is installed at the air outlet end of the cyclone separator (5). The compressor (6) is communicated with the pre-drying cylinder (8) through a high-pressure air pipe (7). A reset elastic cord (36) is arranged between the sealing sliding piece (35) and the inner wall of the sliding opening (34). A driving sprocket (312) and a driven sprocket (313) are rotatably installed inside the drying pipe (3). An impeller (311) is fixedly installed on the outer side of the driving sprocket (312). The driving sprocket (312) and the driven sprocket (313) are connected by a transmission chain (314). A dial rod (315) is fixedly installed on the outer side of the transmission chain (314). A dial shaft (38) is fixedly installed on the side of the dispersing wheel (37) close to the inside of the drying pipe (3). The axes of the driving sprocket (312) and the driven sprocket (313) are on the same horizontal plane.

2. The powder drying device for pea starch production according to claim 1, characterized in that, The bottom end of the pre-drying cylinder (8) is designed to be inclined.

3. A powder drying device for pea starch production according to claim 2, characterized in that, A dispersion ring (83) is arranged on the inner wall of the starch cavity (82), and the dispersion ring (83) is designed to slope downwards.

4. A powder drying device for pea starch production according to claim 1, characterized in that, An upper baffle (32) is arranged at the top end of the spiral filter (31), and the upper baffle (32) extends into the starch cavity (82).

5. A powder drying device for pea starch production according to claim 4, characterized in that, A toothed rod (310) is arranged on the inner wall of the drying pipe (3). A transmission gear (39) is fixedly installed on the outer side of the dial shaft (38), and the transmission gear (39) meshes with the toothed rod (310).

6. The powder drying device for pea starch production according to claim 5, wherein, A partition plate (316) is arranged inside the drying pipe (3). A sealed cavity is formed between the partition plate (316) and the inner wall of the drying pipe (3). The driving sprocket (312), the driven sprocket (313) and the dial shaft (38) are all located in the sealed cavity, and the impeller (311) is located outside the partition plate (316).

7. A powder drying device for pea starch production according to claim 6, characterized in that, Flow guiding vanes (317) are arranged on the outer side of the partition plate (316), and the flow guiding vanes (317) are arranged corresponding to the impeller (311).

8. A powder drying device for pea starch production according to claim 1, characterized in that, A driving motor (21) is fixedly installed on the outer side of the air outlet pipe (2). A driving wheel (22) is fixedly installed at the output end of the driving motor (21). A transmission gear ring (33) is fixedly installed on the outer side of the bottom end of the drying pipe (3). The transmission gear ring (33) is meshed with the driving wheel (22). The radius of the driving wheel (22) is smaller than the maximum radius of the transmission gear ring (33). A pressure sensor is arranged at the top of the pre-drying cylinder (8). Solenoid valves (11) are installed on both the starch pipe (9) and the drain pipe (10). The pressure sensor is electrically connected to the solenoid valve (11) through a controller.

9. A method for drying powder used in pea starch production, which uses a powder drying device for pea starch production according to any one of claims 1-8, characterized in that, It includes the following steps: S1. Dehydration: Inject the starch slurry into the water removal cavity (81) through the feed pipe (84). The hot blast stove (1) sends hot air into the drying pipe (3), and then enters the pre-drying cylinder (8) at high pressure through the cyclone separator (5) and the compressor (6). At the same time, the drying pipe (3) conveys the slurry upward along the water removal cavity (81) through the spiral filter sheet (31). Under the conditions of a temperature of 100°C - 120°C and a pressure of 100 - 110 kPa, the starch slurry is pre-dried to make the water content of the starch 35% - 40%. S2. Drying: The high-pressure air inside the pre-drying cylinder (8) sprays the pretreated starch into the air outlet pipe (2). The starch is sent into the drying pipe (3) with the hot air cup for drying, and then is collected through the cyclone separator (5).

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