Sweeping device of spray drying tower

Abstract

The blowing device of the spray drying tower comprises a blowing rod which is arranged in the spray drying tower and longitudinally attached to the inner wall of the spray drying tower, and the blowing rod is provided with a first air injection area, a second air injection area and a third air injection area. Wherein the wall of the blowing rod, close to the inner wall of the spray drying tower, of the first air injection area is provided with an air hole capable of blowing air to the inner wall of the spray drying tower transversely and obliquely downwards, and the second air injection area is opposite to the joint of the spray drying tower and the cyclone separator and is provided with an open hole capable of directly blowing the turning position of the joint of the spray drying tower and the cyclone separator. The third air injection area is located in an inverted-cone-shaped area of the spray drying tower and provided with an air port capable of obliquely blowing air towards the top of the spray drying tower to the inner wall of the inverted-cone-shaped area of the spray drying tower, and under cooperation of the first air injection area, the second air injection area and the third air injection area, a blowing rod annularly moving along the inner wall in the spray drying tower can generate airflow to blow the spray drying tower. And the material adhesion to the wall and the deposition at the joint between the spray drying tower and the cyclone separator are obviously improved.

Description

Technical Field

[0001] The utility model relates to the field of spray drying devices, specifically to a spray drying tower purge device Background Art

[0002] In the production process of medicines, foods, biological and chemical products, spray drying tower is a commonly used drying equipment with the characteristics of economy, energy saving and stable quality. It can obtain powdered or granular finished products after spray drying the active ingredients in the raw materials. The finished products are collected by the cyclone separator of the spray drying tower and then put into the silo for packaging.

[0003] Although the currently used in-tower purge device can effectively remove materials attached during the production process in a timely manner and reduce the impact of finished product agglomeration, the existing purge device is usually in the form of a bottom-up pipeline, such as Chinese patent CN208711070U. However, because the air jet holes on the purge device are usually oriented in the same direction as the inner wall of the spray drying tower, some of the boiling material in the spray drying tower is often blown toward the inner wall by the crosswind generated by the purge device and contacts the inner wall, resulting in an inability to effectively solve the wall sticking problem. At the same time, because the connection between the spray drying tower and the cyclone separator of the spray drying device is perpendicular to the air supply direction of the air distributor of the spray drying device, materials are easily deposited at the connection and block the channel, causing the spray drying device to be unable to operate continuously. However, because the cleaning pipeline must be opened at the bottom, the exhaust inside the spray drying device causes external air and microorganisms and moisture in the air to enter the spray drying tower, which can easily contaminate the material in the spray drying tower or cause it to become damp and sticky. Utility Model Content

[0004] In response to the above problems, the utility model provides a spray drying tower purge device, which is used to solve the technical problem in the prior art that the liquid material is easily adhered to the wall or deposited at the connection between the spray drying tower and the cyclone separator during the spray drying process, blocking the channel and causing the spray drying device to be unable to work continuously.

[0005] A spray drying tower purging device, the purging device comprises a purging rod arranged in the spray drying tower and longitudinally attached to the inner wall of the spray drying tower, and a driver arranged to be connected to the bottom of the spray drying tower and capable of driving the purging rod to move circularly along the inner wall of the spray drying tower, characterized in that a first jet zone, a second jet zone and a third jet zone are provided on the purging rod wall close to the inner wall of the spray drying tower, an air hole capable of blowing air horizontally and downwardly to the inner wall of the spray drying tower is provided on the purging rod wall close to the inner wall of the spray drying tower, the second jet zone is connected to the spray drying tower and the cyclone separator The spray drying tower is opposite to the separator connection and is provided with an opening capable of directly blowing the connection between the spray drying tower and the cyclone separator. The third jet zone is located in the inverted conical area of ​​the spray drying tower and is provided with an air port capable of blowing obliquely toward the top of the spray drying tower on the inner wall of the inverted conical area of ​​the spray drying tower. Under the cooperation of the first jet zone, the second jet zone and the third jet zone of the purge rod, the purge rod moving in a circular motion along the inner wall of the spray drying tower can generate an airflow to purge the inner wall of the spray drying tower, so that the material enters the cyclone separator through the connection between the spray drying tower and the cyclone separator.

[0006] In a preferred embodiment of the present invention, the air holes in the first jet zone are trumpet-shaped air holes that diffuse outward to form fan-shaped airflow, which obliquely shears the inner wall of the spray drying tower, so that the fan-shaped airflow sweeps the inner wall of the spray drying tower along the moving direction of the blowing rod.

[0007] In some embodiments, the angle (A) formed by the fan-shaped airflow and the cross-section of the inner wall of the spray drying tower is an acute angle, which prevents the blowing rod from stirring the running direction of the hot air in the spray drying tower when blowing the inner wall, so that the spray drying tower material can move quickly to the bottom of the spray drying tower.

[0008] In a preferred embodiment of the present invention, the angle formed by the fan-shaped airflow and the cross-section of the inner wall of the spray drying tower can also be 60° or less, 45° or less, about 30° or less, or about 15° or less. In some embodiments, the angle formed by the fan-shaped airflow and the cross-section of the inner wall of the spray drying tower can be 60°. In other embodiments, the angle formed by the fan-shaped airflow and the cross-section of the inner wall of the spray drying tower can be 45°, 30°, or 15°.

[0009] In a preferred embodiment of the present invention, the fan-shaped airflow has an obtuse inclination angle with the horizontal rotation plane of the purge rod and the moving direction of the purge rod, so as to avoid the fan-shaped airflow generating a crosswind effect on the boiling material in the spray drying tower.

[0010] In some embodiments, the opening of the second jet zone is a trumpet-shaped opening that diffuses outward, which can form a transverse airflow in the area between the second jet zone and the connection between the spray drying tower and the cyclone separator, so that the material enters the cyclone separator through the connection between the spray drying tower and the cyclone separator.

[0011] In a preferred embodiment of the present invention, the peripheral openings of the second jet zone are evenly distributed on the wall of the purge rod of the second jet zone with the central opening as the center, wherein the ventilation volume of the central opening is greater than the ventilation volume of the peripheral openings.

[0012] In a preferred embodiment of the present invention, the central opening of the second air-jet zone bulges outwards, and forms a centrally bulged curved surface structure with the peripheral openings.

[0013] In some embodiments, the air outlet of the third jet zone is a trumpet-shaped air outlet that diffuses outward to form a radial unidirectional airflow. The shear angle formed by the radial unidirectional airflow and the longitudinal section of the inner wall of the inverted conical area of ​​the spray drying tower is an obtuse angle. When the purge rod moves in a circular motion along the inner wall of the spray drying tower, it can generate an upward spiral airflow to lift the material falling to the bottom of the spray drying tower to prevent the material in the spray drying tower from being deposited at the bottom of the spray drying tower.

[0014] In a preferred embodiment of the present invention, the inclination angle between the radial unidirectional airflow and the moving direction of the purge rod is an obtuse angle, so as to prevent the fan-shaped airflow from generating a crosswind effect on the boiling material in the spray drying tower.

[0015] In some embodiments of the present invention, the purge device is driven by a motor, wherein the purge rod is sleeved onto a traction rod of the motor. When the motor is started, the traction rod drives the purge rod to rotate, thereby causing the purge rod to move in a circular motion along the inner wall of the spray drying tower.

[0016] In which, the purging device is also provided with a compressed air storage chamber between the spray drying tower and the driver, and a vent is provided on the part of the purging rod that is sealed and passes through the compressed air storage chamber, and the compressed air storage chamber supplies compressed air to the purging rod through the vent.

[0017] In a preferred embodiment of the present invention, the driver of the purging device can be an air slip ring, which is sleeved on the bottom of the spray drying tower. The rotor of the air slip ring is sleeved on the purge rod, so that the air outlet of the air slip ring is placed in the purge rod, and the stator of the air slip ring is sleeved on the rotating shaft, so that compressed air is input into the purge rod through the gas channel in the rotating shaft and the air outlet of the air slip ring, and the rotor is driven to rotate around the rotating axis of the air slip ring, so that the purge rod can move in a circular motion along the inner wall of the spray drying tower in the spray drying tower, thereby realizing the purge of the inner wall of the spray drying tower during the spray drying process.

[0018] In a preferred embodiment of the present invention, the purging device is also provided with an air heating sterilizer, which is configured to heat and sterilize the compressed air and then deliver it to the purging rod to avoid introducing outside air to destroy the high-temperature sterile environment in the spray drying tower.

[0019] In a preferred embodiment of the present invention, the purging device is further provided with a light sensing probe, which is attached to the outer wall of the spray drying tower so that the light sensing probe can generate light that passes through the wall of the spray drying tower to monitor the material adhesion on the inner wall of the spray drying tower.

[0020] In a preferred embodiment of the present invention, the light sensing probe is electrically connected to the driver. The driver automatically starts / closes the valve on the compressed air pipeline and the switch of the driver according to the electrical signal provided by the light sensing probe, controls the compressed air flow in the purge rod and the rotation speed in the spray drying tower, thereby ensuring that the purge rod can purge the inner wall and connection of the spray drying tower at any time to prevent material adhesion.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The purge device of the utility model is designed with air holes of different angles in different areas of the purge tower, so that the purge rod moving in a circular motion along the inner wall of the spray drying tower can generate airflow to purge the inner wall of the spray drying tower, so that the material enters the cyclone separator through the connection between the spray drying tower and the cyclone separator, effectively reducing the risk of material sticking to the wall or deposition at the connection.

[0023] 2. The purge device of the present invention, in cooperation with the air slip ring, can allow compressed air to be axially input into the purge rod through the gas channel of the stator and the rotor, and drive the rotor to rotate around the rotating axis of the air slip ring, so that the purge rod can move in a circular motion along the inner wall of the spray drying tower in the spray drying tower, thereby realizing online purge of the inner wall of the spray drying tower during the spray drying process.

[0024] 3. The purge device of the present invention heats and sterilizes the compressed air by configuring an air heating sterilizer, thereby avoiding the introduction of outside air to destroy the high-temperature sterile environment in the spray drying tower.

[0025] 4. The purge device of the present invention is further provided with a light-sensing probe on the outer wall of the spray drying tower. The light-sensing probe monitors the material adhesion on the inner wall of the spray drying tower in real time and provides an electrical signal to the air slip ring, thereby automatically starting / closing the air valve at the stator and the rotation switch of the rotor, controlling the compressed air flow rate in the purge rod and the rotation speed in the spray drying tower, thereby ensuring that the purge rod can purge the inner wall and joints of the spray drying tower at any time to prevent material adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the purge rod of the purge device described in Example 1 of the present application rotating to the side of the spray drying tower

[0027] Figure 2 This is a schematic diagram of the structure of the purge rod of the purge device described in Example 1 of the present application rotating to the front of the spray drying tower

[0028] Figure 3 Schematic diagram of the air holes and fan-shaped airflow in the first jet zone of the purge rod described in Example 1 of the present application

[0029] Figure 4 Schematic diagram of the structure of the opening of the second jet zone and the lateral airflow of the purge rod in Example 1 of the present application

[0030] Figure 5 Schematic diagram of the structure of the third jet zone air port and radial unidirectional airflow of the purge rod described in Example 1 of the present application

[0031] Figure 6 Schematic diagram of the purge airflow direction of the purge device described in Example 1 of the present application

[0032] Figure 7 This is a schematic diagram of the structure of the purge device described in Example 2 of the present application, which is driven by an air slip ring.

[0033] Figure 8 This is a schematic diagram of the structure of the motor as the driver of the purge device described in Example 3 of the present application

[0034] Figure 9 Schematic diagram of the structure of the purge device described in Example 4 of this application with an air heating sterilizer

[0035] Figure 10 Schematic diagram of the structure of the purge device according to Example 5 of this application provided with a light sensing probe

[0036] Illustration:

[0037] 1. Spray drying device, 11- spray drying tower, 12- cyclone separator, 13- air distributor, 14- connection

[0038] 2. Purge rod, 21-first jet area, 22-second jet area, 23-third jet area, 24-air hole, 25-opening, 251-center opening, 252-peripheral opening, 26-air port, 27-vent

[0039] 3. Drive, 31-slip ring, 311-rotor, 312-stator, 313-rotating shaft, 314-gas channel, 315-inlet, 316-outlet; 32-motor, 321-traction rod

[0040] 4. Compressed air storage chamber, 41 rolling bearing, 411-outer ring, 412 inner ring

[0041] 5. Air heating sterilizer

[0042] 6. Light sensor probe DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the utility model embodiments in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the utility model embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of utility model protection.

[0044] Example 1

[0045] See also Figure 1-6 , a spray drying tower purging device, the purging device comprises a purging rod 2 arranged in the spray drying tower 11 and longitudinally attached to the inner wall of the spray drying tower 11, and a driver 3 for driving the purging rod 2 to move circularly along the inner wall of the spray drying tower 11, characterized in that a first jet zone 21, a second jet zone 22 and a third jet zone 23 are provided on the purging rod 2. The first jet zone 21 is close to the inner wall of the spray drying tower 11. The purging rod 2 is provided with an air hole 24 on the rod wall that can blow air horizontally and downwardly to the inner wall of the spray drying tower 11. The second jet zone 22 is opposite to the connection 14 between the spray drying tower 11 and the cyclone separator 12, and An opening 25 is provided that can directly blow the connection 14 between the spray drying tower 11 and the cyclone separator 12. The third jet zone 23 is located in the inverted conical area of ​​the spray drying tower 11 and is provided with an air port 26 that can blow air obliquely toward the top of the spray drying tower 11 on the inner wall of the inverted conical area of ​​the spray drying tower 11. Under the cooperation of the first jet zone 21, the second jet zone 22 and the third jet zone 23 of the purge rod 2, the purge rod 2 that moves annularly along the inner wall of the spray drying tower 11 can generate an airflow to purge the inner wall of the spray drying tower 11, so that the material enters the cyclone separator 12 through the connection 14 between the spray drying tower 11 and the cyclone separator 12.

[0046] The air holes 24 of the first jet zone 21 are trumpet-shaped air holes that diffuse outward to form a fan-shaped airflow. The fan-shaped airflow obliquely shears the inner wall of the spray drying tower 11, so that the fan-shaped airflow sweeps the inner wall of the spray drying tower 11 along the moving direction of the blowing rod 2.

[0047] During operation, the angle a formed between the fan-shaped airflow generated by the air holes 24 of the first air jet region 21 and the cross-section of the inner wall of the spray drying tower 11 is acute. This design effectively prevents the purge rod 2 from stirring the hot air circulating downward from the top of the spray drying tower 11 when the purge rod 2 purges the inner wall, thereby enabling the material within the spray drying tower 11 to move rapidly toward the bottom of the tower.

[0048] The angle a formed by the fan-shaped airflow and the cross-section of the inner wall of the spray drying tower 11 in this embodiment can also be 60° or less, 45° or less, about 30° or less, or about 15° or less. Optionally, the angle a formed by the fan-shaped airflow and the cross-section of the inner wall of the spray drying tower can be 60°, 45°, 30°, or 15°.

[0049] During use, the fan-shaped airflow generated by the air holes 24 of the first air-jet zone 21 is inclined at an obtuse angle b relative to the direction of movement of the purge rod 2 in the horizontal rotation plane of the purge rod 2. This design effectively prevents the fan-shaped airflow from creating a crosswind effect on the boiling material within the spray-drying tower 11, thereby improving the purge capacity of the purge rod 2, making it easier for the material to escape from the inner wall of the spray-drying tower 11 and reducing the difficulty of clearing the spray-drying tower 11.

[0050] In this embodiment, the opening 25 of the second jet zone 22 may be a trumpet-shaped opening that diffuses outward, and can form a transverse airflow in the area between the second jet zone 22 and the connection 14 between the spray drying tower 11 and the cyclone separator 12, so that the material enters the cyclone separator 13 through the connection 14 between the spray drying tower 22 and the cyclone separator 13, thereby preventing the material from being deposited at the connection 14 between the spray drying tower 11 and the cyclone separator 12 and clogging the passage of the material cyclone separator 12.

[0051] The peripheral openings 252 of the second jet zone 22 are evenly distributed on the wall of the purge bar 2 of the second jet zone 22, centered around the central opening 251. During use, the central opening 251 provides a greater airflow than the peripheral openings 252. In this embodiment, the openings 25 arranged in a plum blossom pattern within the second jet zone 22 facilitate the formation of a transverse airflow aligned with the connection 14 between the spray tower 11 and the cyclone separator 12, allowing material within the spray bar 11 to be rapidly transported to the cyclone separator 12 via the transverse airflow.

[0052] In this embodiment, the central opening 251 of the second jet zone 22 can be further designed to bulge toward the connection 14 between the spray drying tower 11 and the cyclone separator 12 , forming a centrally bulged curved surface structure with the peripheral openings 252 .

[0053] In this embodiment, the air outlet 26 of the third jet zone 23 can be a trumpet-shaped air outlet that diffuses outward to form a radial unidirectional airflow. The shear angle c formed by the radial unidirectional airflow and the longitudinal section of the inner wall of the inverted conical region of the spray drying tower 11 is an obtuse angle. Through this design, the radial unidirectional airflow can generate an upward airflow when the purge rod 2 moves in a circular motion along the inner wall of the spray drying tower 11, thereby lifting the material in the spray drying tower 11 and preventing the material from being deposited at the bottom of the spray drying tower 11 and forming adhesions. During use, the inclination angle d of the radial unidirectional airflow in the horizontal rotation plane of the purge rod 2 and the moving direction of the purge rod 2 is an obtuse angle, thereby preventing the radial unidirectional airflow from interfering with the lifting of the boiling material at the bottom of the spray drying tower 11, thereby enabling the material to be more easily purged from the opening 25 of the second jet zone 22 and smoothly enter the cyclone separator 13.

[0054] Example 2

[0055] This embodiment provides a spray drying tower purge device, referring to Figure 7 As shown, its structure is roughly the same as that of Example 1, except that: the driver 3 of the purging device can be an air slip ring 31, and the air slip ring 31 is sleeved on the bottom of the spray drying tower 11, and the air slip ring 31 is configured to drive the purging rod to move in a circular manner along the inner wall of the spray drying tower 11.

[0056] In this embodiment, the rotor 311 of the air slip ring 31 is sleeved on the purge rod 21, so that the air outlet 316 of the air slip ring 31 is placed in the purge rod 21, and the stator 312 of the air slip ring 31 is sleeved on the rotating shaft 313, so that the compressed air enters the gas channel 314 in the rotating shaft 313 through the air inlet 315, and is input into the purge rod 21 through the air outlet 316 of the air slip ring 31.

[0057] When powered on, the conductive ring and brushes of the air slip ring 31 cooperate to drive the rotor 311 to rotate around the rotating axis 313 of the air slip ring 31, so that the purge rod 21 can move in a circular motion along the inner wall of the spray drying tower 11, thereby realizing purge during the spray drying process of the spray drying tower 11.

[0058] Example 3:

[0059] This embodiment provides a spray drying tower purge device, referring to Figure 8 As shown, its structure is roughly the same as that of Example 2, except that:

[0060] The driver 3 of the purging device can also be a motor 32, wherein the purging rod 2 is sleeved on the traction rod 321 of the motor 32; the purging device is also provided with a compressed air storage chamber 4 between the spray drying tower 11 and the driver 3, and a vent 27 is provided on the part of the purging rod 2 that is sealed and passes through the compressed air storage chamber 4, and the compressed air storage chamber 4 supplies compressed air to the purging rod 2 through the vent 27.

[0061] Among them, the inner ring 412 of the rolling bearing 41 is fixedly sleeved on the purge rod 2 at both ends of the purge rod 2 and the compressed air storage chamber 4, and the outer ring 411 of the rolling bearing 41 is fixedly connected to the two ends of the compressed air storage chamber 4. Under the action of the rolling bearing 41, during the rotation of the purge rod 2, the compressed air storage chamber 4 can remain stationary relative to the purge rod 2.

[0062] When the motor 32 is started, the traction rod 321 of the motor 32 drives the purge rod 2 to move in a circular motion along the inner wall of the spray drying tower 22. As the purge rod 2 rotates, the rolling bearing 41 allows the compressed air storage chamber 4 to remain stationary, thereby preventing the purge rod 2 from being detrimental to the delivery of compressed air during rotation.

[0063] Example 4

[0064] This embodiment provides a spray drying tower purge device, referring to Figure 9 As shown, based on Example 3 and Example 4: the purging device is further provided with an air heating sterilizer 4, and the air heating sterilizer 3 is configured to heat and sterilize the compressed air to the purging rod 2 to avoid introducing outside air to destroy the high-temperature sterile environment in the spray drying tower 11.

[0065] Example 5

[0066] This embodiment provides a spray drying tower purge device, referring to Figure 10 As shown, based on Examples 3 and 4, the purge device is further provided with a light-sensing probe 5. The light-sensing probe 5 is attached to the outer wall of the spray drying tower 11, so that the light-sensing probe 5 can generate light that penetrates the wall of the spray drying tower 11 and monitors the material adhesion to the inner wall of the spray drying tower 11. During use, the purge device is activated by the control console of the spray drying device 1, and the light-sensing probe 5 of the purge device effectively monitors the material adhesion to the inner wall of the spray drying tower 11 and the connection 14.

[0067] Among them, the optical probe 5 is electrically connected to the driver 3. The driver 3 automatically starts / closes the valve of the compressed air pipeline and the switch of the driver 3 according to the electrical signal provided by the optical probe 5, controls the compressed air flow in the purge rod 2 and the rotation speed in the spray drying tower 1, thereby ensuring that the purge rod 2 can purge the inner wall and the connection 14 of the spray drying tower 1 at any time to prevent material adhesion, thereby effectively ensuring that the spray drying device 1 can operate effectively.

[0068] Example 6

[0069] This embodiment utilizes the spray drying tower purge device described in Example 1 in a spray dryer for spray drying the astragalus extract.

[0070] Equipment used: Buchi B290 spray dryer, purge device described in Example 1, extraction and concentration equipment

[0071] Extracted medicinal materials: Astragalus slices

[0072] Extraction solvent: water

[0073] Preparation of extract / concentrate: extract twice with 10 times water, each time for 1 hour, combine the extracts, and concentrate under reduced pressure to a relative density of 1.15-1.2 (60°C) for later use.

[0074] Take 4 portions of Astragalus concentrate and divide them into two groups. The first group has 2 portions of Astragalus concentrate, each corresponding to 800g of medicinal materials; the second group has 2 portions of Astragalus concentrate, each corresponding to 1600g of medicinal materials.

[0075] The first portion of the first group and the first portion of the second group were prepared using a Buchi B290 spray dryer equipped with the spray tower purge device described in Example 1; the second portion of the first group and the second portion of the second group were prepared using an existing Buchi B290 spray dryer (without the spray tower purge device described in Example 1).

[0076] Among them, both groups adopted the following spray drying process parameters:

[0077] Inlet air temperature 160℃, liquid inlet speed 14rmp, air extraction volume 93%

[0078] The spray drying effect of the spray dryer equipped with the spray drying tower purge device described in Example 1 was investigated.

[0079] The specific results are as follows:

[0080]

[0081]

[0082] The above describes in detail the spray drying tower purge device provided by the present invention. The principles and implementation methods of the present invention are described herein using specific examples. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A spray drying tower purge device, comprising a purge rod disposed in the spray drying tower and longitudinally contacting the inner wall of the spray drying tower, and a driver connected to the bottom of the spray drying tower and capable of driving the purge rod to move circularly along the inner wall of the spray drying tower, characterized in that The purge rod is provided with a first jet area, a second jet area and a third jet area. Wherein, the blowing rod wall of the first jet zone close to the inner wall of the spray drying tower is provided with an air hole capable of blowing air horizontally and downwardly to the inner wall of the spray drying tower. The second jet zone is opposite to the connection between the spray drying tower and the cyclone separator, and is provided with an opening capable of directly blowing the connection between the spray drying tower and the cyclone separator. The third air-jet zone is located in the inverted cone region of the spray drying tower and is provided with an air port capable of blowing air obliquely toward the top of the spray drying tower on the inner wall of the inverted cone region of the spray drying tower. Under the cooperation of the first jet zone, the second jet zone and the third jet zone of the blowing rod, the blowing rod moving in a circular manner along the inner wall of the spray drying tower can generate airflow to blow the inner wall of the spray drying tower, so that the material enters the cyclone separator through the connection between the spray drying tower and the cyclone separator.

2. The purging device according to claim 1, characterized in that The air holes in the first jet zone are trumpet-shaped air holes that spread outward to form fan-shaped airflow, which obliquely shears the inner wall of the spray drying tower, so that the fan-shaped airflow sweeps the inner wall of the spray drying tower along the moving direction of the blowing rod.

3. The purging device according to claim 2, characterized in that: The angle formed by the fan-shaped airflow and the cross section of the inner wall of the spray drying tower is an acute angle, and the inclination angle between the fan-shaped airflow and the horizontal rotation plane of the purge rod and the moving direction of the purge rod is an obtuse angle.

4. The purging device according to claim 1, characterized in that The openings of the second jet zone are trumpet-shaped openings that diffuse outward, and can form a transverse airflow in the area between the second jet zone and the connection between the spray drying tower and the cyclone separator, so that the material enters the cyclone separator through the connection between the spray drying tower and the cyclone separator.

5. The purging device according to claim 4, characterized in that: The openings on the periphery of the second jet zone are evenly distributed on the wall of the purge rod of the second jet zone with the central opening as the center of the circle. Or the central opening of the second jet zone bulges outwards, forming a centrally bulged curved surface structure with the peripheral openings.

6. The purging device according to claim 1, characterized in that: The air outlet of the third jet zone is a trumpet-shaped air outlet that spreads outward to form a radial unidirectional airflow. The shear angle formed by the radial unidirectional airflow and the longitudinal section of the inner wall of the inverted conical area of ​​the spray drying tower is an obtuse angle, and the inclination angle between the radial unidirectional airflow and the moving direction of the purge rod is an obtuse angle.

7. The purging device according to claim 1, characterized in that The driver is an air slip ring, which is configured to deliver compressed air to the purge rod and drive the purge rod to move in a circular motion along the inner wall of the spray drying tower.

8. The purging device according to claim 1, characterized in that: The driver is a motor, and the motor is configured to cause the purge rod to move in a circular motion along the inner wall of the spray drying tower. In which, the purging device is also provided with a compressed air storage chamber between the spray drying tower and the driver, and a vent is provided in the part of the purge rod that passes through the compressed air storage chamber. When the purge rod moves in a circular shape along the inner wall in the spray drying tower, the compressed air storage chamber supplies compressed air to the purge rod through the vent.

9. The purging device according to any one of claims 1 to 8, characterized in that: The purging device is provided with an air heating sterilizer, which is configured to heat and sterilize the compressed air and then deliver it to the purging rod.

10. The purging device according to any one of claims 1 to 8, characterized in that: The purging device is further provided with a light sensing probe, which is attached to the outer wall of the spray drying tower so that the light sensing probe can generate light that passes through the wall of the spray drying tower to monitor the material adhesion condition on the inner wall of the spray drying tower.

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