Double-flow spray granulation dryer

Abstract

The utility model discloses a double-flow spray granulation drying machine which comprises a drying tower, the first feeding and spraying unit is used for spraying wet materials into the drying tower, and the output end of the first feeding and spraying unit is matched with the upper part of the drying tower; the first air supply heating unit is used for heating mist sprayed by the first feeding and spraying unit, and the output end of the first air supply heating unit is matched with the upper part of the drying tower; after the fluidization unit is connected with the output end of the drying tower, an inner cavity of the fluidization unit is communicated with an inner cavity of the drying tower, and an output port is formed in the fluidization unit; the second feeding and spraying unit is used for spraying the wet material into the fluidization unit and polymerizing the wet material with the material which is dried in the drying tower and moves downwards; the output end of the second feeding and spraying unit is matched with the fluidization unit; and the second air supply heating unit is used for drying the materials, and the output end of the second air supply heating unit is matched with the fluidization unit. The granulator has the advantages of high granulation efficiency, large particle size and uniform particles.

Description

Technical Field

[0001] The utility model relates to the technical field of drying and granulating, in particular to a double-flow spray granulating dryer. Background Art

[0002] Artificial fogging utilizes a high-pressure system to spray liquid as extremely fine water particles. These tiny artificial fog particles can drift and suspend in the air for a long time, forming a white mist. Spray is a mixture of tiny particles suspended in a gas. These particles may be tiny drops of water or pigment. A fluidized bed is a reactor that uses gas or liquid to pass through a granular solid layer, causing the solid particles to be suspended in motion and undergoing a gas-solid phase reaction or a liquid-solid phase reaction. These include dispersed fluidized beds, aggregated fluidized beds, fluidized beds, turbulent beds, and air-transported beds. Fluidized bed granulation, also known as fluidized bed granulation or one-step granulation, involves placing the materials into a sealed container all at once, uniformly mixing them within the container, then spraying a binder at a uniform rate through the equipment to allow the binder and materials to fully mix and flow within the container to form small particles. Hot air is then introduced through the bottom to dry the wet particles, and the finished dry particles are then directly collected.

[0003] The existing spray granulation fluidized bed dryer includes an air distribution chamber, a granulation chamber, and a settling chamber. The bottom of the air distribution chamber is provided with multiple air inlets, an air distribution plate is provided between the air distribution chamber and the granulation chamber, a discharge port is provided at the discharge end of the granulation chamber, multiple spray guns are symmetrically provided on both sides of the granulation chamber, a feed port is provided on the settling chamber, multiple air outlets are provided on the top of the settling chamber, an internal heating chamber is provided between the granulation chamber and the settling chamber, an internal heater is provided in the internal heating chamber, multiple knives are symmetrically provided on both sides of the granulation chamber, the spray guns are symmetrically arranged on both sides of the knives, the air distribution plate is a composite side-blowing air distribution plate, and the spray guns use an air-sealed spray gun valve seat. This spray granulation fluidized bed dryer has the following disadvantages:

[0004] The thermal efficiency is low and the steam consumption is high; the amount of compressed air consumed by the spray gun atomization is large, the granulation efficiency is low, and the power consumption of the air compressor is high; there is leakage from the air distribution plate, and the material leaking into the air distribution chamber will decompose due to being in a high temperature state for a long time, producing odor, and being discharged into the atmosphere with the exhaust gas will cause environmental pollution; the bed needs to be cleaned regularly, and the material is not discharged thoroughly when the bed is shut down for cleaning, and the labor intensity of the operator is high; dust overflows when the spray gun is drawn out, polluting the operating environment; the product strength is low and the specific gravity is relatively small. Utility Model Content

[0005] The utility model provides a double-flow spray granulation dryer with high material preparation efficiency.

[0006] The technical solutions to the above technical problems are as follows:

[0007] Double-flow spray granulation dryer, including:

[0008] Drying tower;

[0009] The wet material is sprayed into the first feeding spray unit inside the drying tower, and the output end of the first feeding spray unit is matched with the upper part of the drying tower;

[0010] A first air supply heating unit for heating the mist sprayed from the first feeding spray unit, wherein the output end of the first air supply heating unit cooperates with the upper part of the drying tower; characterized in that it further comprises:

[0011] The fluidizing unit is connected to the output end of the drying tower, and the inner cavity of the fluidizing unit communicates with the inner cavity of the drying tower. The fluidizing unit is provided with an output port;

[0012] a second feeding spray unit for spraying the wet material into the fluidizing unit to polymerize with the material dried in the drying tower and moving downward, the output end of the second feeding spray unit being coordinated with the fluidizing unit;

[0013] The second air supply and heating unit dries the material, and the output end of the second air supply and heating unit cooperates with the fluidizing unit.

[0014] In the utility model, hot air is introduced into the upper and lower parts of the drying tower, and mist is sprayed out from the upper and lower parts of the drying tower through the feeding spray units. After the water in the upper mist is evaporated, the fine particles remaining move to the lower part of the drying tower under the action of gravity. After the water in the lower mist is evaporated, the fine particles remaining, the fine particles moving to the lower part of the drying tower collide with the fine particles remaining from the evaporation in the lower part and agglomerate to form coarse particles. When the specific gravity of the coarse particles increases to overcome the force of the hot air blown out by the second air supply heating unit, the coarse particles settle onto the orifice plate in the fluidizing unit. Under the action of the hot air, the coarse particles on the orifice plate move toward the output port while being dried and finally discharged from the output port. This granulation method does not require long-term movement as in, for example, a fluidized bed. Therefore, it has the advantages of short granulation time and high granulation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of a double-flow spray granulation dryer.

[0016] Figure 2 for Figure 1 Enlarged view of the P part in the figure.

[0017] Figure 3 for Figure 1 Enlarged view of the Q section in .

[0018] Figure 4 This is a cross-sectional structural diagram of the fluidized unit in the combined state.

[0019] Figure 5This is a cross-sectional structural diagram of the fluidized unit in the separated state.

[0020] Symbols in the accompanying drawings:

[0021] Drying tower 1, first delivery pump 2, first spray component 3, first blower 4, first heater 5, connecting assembly 6, upper cylinder 6a, lower cylinder 6b, movable cylinder 6c, inner hole 6d, support seat 6e, lifting drive 6f, flange 6g, first sealing ring 6h, bracket 6i, limit component 6j, second sealing ring 6k, feed port 6m, orifice plate 7, air vent 7a, output port 8, second delivery pump 9, second spray component 10, second blower 11, second heater 12, third blower 13, first three-way valve 14, screening component 15, return pipe 16, first return pipe 16a, second return pipe 16b, dust collector 17, induced draft fan 18, first cyclone separator 19, second three-way valve 20, third three-way valve 21, second cyclone separator 22. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0027] like Figures 1 to 5 As shown, the double-flow spray granulation dryer of the present invention includes a drying tower 1, a first feeding spray unit, a first air supply and heating unit, a fluidizing unit, a second feeding spray unit, and a second air supply and heating unit. The following describes each part and the relationship between them in detail.

[0028] The first feed spray unit sprays the wet material into the interior of the drying tower 1. The output end of the first feed spray unit is aligned with the upper portion of the drying tower 1. The first feed spray unit includes a first delivery pump 2 and a first spray component 3. The output end of the first delivery pump 2 is connected to the input end of the first spray component 3, and the output end of the first spray component 3 is aligned with the upper portion of the drying tower 1. The first spray component 3 is a spray gun. The upper end surface of the drying tower 1 is provided with a first mounting hole. The output end of the first spray component 3 passes through the first mounting hole and enters the interior of the drying tower 1. The first spray component 3 is fixed to the drying tower 1.

[0029] The first air supply and heating unit heats the mist sprayed out by the first feeding spray unit, and the output end of the first air supply and heating unit cooperates with the upper part of the drying tower 1. The first air supply and heating unit includes a first blower 4 and a first heater 5. The output end of the first blower 4 is connected to the first heater 5, and the first heater 5 cooperates with the upper part of the drying tower 1. The first heater 5 is composed of a first pipe and a first heating component installed in the first pipe. The wind generated by the first blower 4 when working enters the first heater 5 and is heated by the first heater 5. The heated wind flows along the first pipe and is finally output to the interior of the drying tower 1. In this embodiment, a second mounting hole is provided on the upper end face of the drying tower 1, and the output end of the first pipe passes through the second mounting hole and enters the interior of the drying tower 1, and the first pipe is fixed to the drying tower 1.

[0030] After the fluidizing unit is connected to the output end of the drying tower 1, the inner cavity of the fluidizing unit communicates with the inner cavity of the drying tower 1, and the fluidizing unit is provided with an output port 8. The drying tower 1 consists of a cylindrical barrel and a conical barrel. The cylindrical barrel is located on the upper part of the conical barrel and is fixed to one end of the conical barrel. The other end of the conical barrel is provided with an output end. The fluidizing unit is fixed to the output end of the conical barrel.

[0031] The fluidizing unit includes a connecting assembly 6 and a perforated plate 7 having a vent 7a. The perforated plate 7 is mounted inside the connecting assembly 6. The vent 7a is axially inclined relative to the connecting assembly 6 and is tilted toward an outlet 8 on the fluidizing unit. The outlet 8 is located on the connecting assembly 6.

[0032] The connecting assembly 6 includes an upper cylinder 6a, a lower cylinder 6b, and a movable cylinder 6c. One end of the upper cylinder 6a is fixed to the output end of the drying tower 1, and the lower cylinder 6b is fixed to a fixing frame 6i. The fixing frame 6i supports the lower cylinder 6b. One end of the movable cylinder 6c is inserted into the lower cylinder 6b and is clearance-matched with the lower cylinder 6b. When necessary, the movable cylinder 6c can be raised and lowered along the axial direction of the lower cylinder 6b. The orifice plate 7 is fitted in the inner hole 6d of the movable cylinder 6c. The movable cylinder 6c moves axially along the lower cylinder 6b and is combined with or separated from the upper cylinder 6a.

[0033] The inner hole 6d of the movable cylinder 6c is a stepped hole, and the orifice plate 7 is located in the stepped hole. When the movable cylinder 6c is combined with the upper cylinder 6a, after the other end of the upper cylinder 6a is inserted into the stepped hole, the orifice plate 7 is pressed between the other end of the upper cylinder 6a and the stepped surface of the stepped hole.

[0034] Due to the presence of powdered material in the fluidizing unit, the orifice plate 7 inevitably becomes clogged after a period of use. Therefore, in order to conveniently and quickly replace the orifice plate 7, in the utility model, the connecting assembly 6 includes a structure of an upper cylinder 6a, a lower cylinder 6b, and a movable cylinder 6c. Since the upper cylinder 6a is fixed to the output end of the drying tower 1, and the lower cylinder 6b is also in a fixed state, when it is necessary to replace the orifice plate 7, it is only necessary to move the movable cylinder 6c downward along the lower cylinder 6b to separate the movable cylinder 6c from the upper cylinder 6a, forming a clearance space between the movable cylinder 6c and the upper cylinder 6a, so that the orifice plate 7 can be taken out of the movable cylinder 6c and replaced with a clean orifice plate 7. This structure can achieve the purpose of convenient and quick replacement of the orifice plate 7.

[0035] The connecting assembly 6 further includes a lifting actuator 6f for driving the movable cylinder 6c to move up and down. A flange 6g is provided on the circumferential surface of the other end of the movable cylinder 6c, and the lifting actuator 6f is connected to the flange 6g. The lifting actuator 6f can be a common linear drive component such as a pneumatic cylinder, a hydraulic cylinder, or an electric screw. When the orifice plate 7 needs to be replaced, the flange 6g and the movable cylinder 6c are driven down by the lifting actuator 6f. After the orifice plate 7 is replaced, the flange 6g and the movable cylinder 6c are driven up by the lifting actuator 6f, so that the orifice plate 7 is pressed between the other end of the upper cylinder 6a and the stepped surface of the stepped hole, and the orifice plate 7 is maintained in this state of being pressed between the upper cylinder 6a and the stepped surface by the lifting actuator 6f.

[0036] The connecting assembly 6 also includes a support seat 6e and a bracket 6i. The support seat 6e is fixed on the circumferential surface of the lower cylinder 6b, and the lifting drive 6f is fixed on the support seat 6e. The support seat 6e is used to install and support the lifting drive 6f. The bracket 6i is fixed to the lower cylinder 6b and is used to support the lower cylinder 6b.

[0037] The connecting assembly 6 also includes a first sealing ring 6h and a second sealing ring 6k. A first annular groove is provided on the circumference of the other end of the upper cylinder 6a. The first sealing ring 6h is installed in the first annular groove on the upper cylinder 6a to seal the gap between the upper cylinder 6a and the movable cylinder 6c. The movable cylinder 6c is provided with a second annular groove on its circumference. The second sealing ring 6k is installed in the first annular groove to seal the movable cylinder 6c and the lower cylinder 6b. The first sealing ring 6h and the second sealing ring 6k prevent powdered material from escaping from the gap between the upper cylinder 6a and the movable cylinder 6c to the outside of the fluidizing unit, and from escaping from the gap between the movable cylinder 6c and the lower cylinder 6b to the outside of the fluidizing unit.

[0038] The connecting assembly 6 also includes a limiting member 6j for limiting the position of the movable cylinder 6c as it ascends axially along the lower cylinder 6b. The limiting member 6j is mounted on and fixed to the upper cylinder 6a. When the lifting driver 6f drives the flange 6g and the movable cylinder 6c upward, the flange 6g and the limiting member 6j abut against each other, preventing the flange 6g and the movable cylinder 6c from ascending further. At this point, the orifice plate 7 is precisely compressed between the other end of the upper cylinder 6a and the stepped surface of the stepped hole. Therefore, the cooperation between the limiting member 6j and the flange 6g prevents the orifice plate 7 from deformation or damage.

[0039] A second feed spray unit sprays the wet material into the fluidizing unit to aggregate with the material dried and moving downward in the drying tower 1. The output of the second feed spray unit is located within the fluidizing unit. The second feed spray unit includes a second delivery pump 9 and a second spray component 10. The output of the second delivery pump 9 is connected to the input of the second spray component 10, and the output of the second spray component 9 is located within the fluidizing unit. In this embodiment, a feed port 6m is provided on the circumference of the upper barrel 6a. The output of the second spray component 10 extends through the feed port 6m into the interior of the upper barrel 6a. The second spray component 10 is a spray gun and is fixed to the upper barrel 6a.

[0040] The second air supply and heating unit is used to dry the material. The output end of the second air supply and heating unit cooperates with the fluidizing unit. The second air supply and heating unit includes a second air blower 11 and a second heater 12. The output end of the second air blower 11 is connected to the second heater 12, and the output end of the second heater 12 cooperates with the fluidizing unit. The second heater 12 is composed of a second pipe and a second heating component installed in the second pipe. The first heating component and the second heating component use electric heating wires. One end of the second pipe is connected to the output end of the second air blower 11, and the other end of the second pipe is connected to the air inlet of the lower cylinder 6b. The air inlet of the lower cylinder 6b is located below the orifice plate 7.

[0041] This embodiment also includes a third air supply fan 13, a first three-way valve 14, a screening component 15, a return pipe 16, a dust collector 17, and an induced draft fan 18. The output end of the third air supply fan 13 is connected to the first port of the first three-way valve 14, the second port of the first three-way valve 14 is connected to the output port 8 on the fluidizing unit, and the third port of the first three-way valve 14 is connected to the input end of the screening component 15. The material output from the output port 8 includes not only particles made by the machine mouth of the utility model, but also a coarse particle material output end and a powder output end on the screening component 15. After the particles and powder are screened by the screening component 15, the coarse particle material output end on the screening component 15 outputs the prepared particles, and the powder output end on the screening component 15 is connected to one end of the return pipe 16. The other end of the return pipe 16 cooperates with the upper part of the drying tower 1, and the powder returns to the drying tower 1 through the return pipe 16 for re-processing. Since the air flow in the drying tower 1 is discharged from the top of the drying tower 1, and part of the powder is discharged with the air flow, the input end of the dust collector 17 is matched with the upper part of the drying tower 1, and the induced draft fan 18 is connected to the dust collector 17. The air flow is filtered by the dust collector 17 and then discharged into the atmosphere. The filtered powder is collected and reused for material making.

[0042] In the present invention, the third blower 13 is connected to the first three-way valve 14, and the wind generated by the third blower 13 pushes the output material into the first cyclone separator 19, which can avoid the output material from being blocked in the pipeline.

[0043] This embodiment also includes a first cyclone separator 19, a second three-way valve 20, a third three-way valve 21, and a second cyclone separator 22; the input port of the first cyclone separator 19 is connected to the third port of the first three-way valve 14, the first output port of the first cyclone separator 19 is connected to the input end of the screening component 15, the second output port of the first cyclone separator 19 is connected to the first port of the second three-way valve 20, and the second port of the second three-way valve 20 is connected to the powder output end on the screening component 15.

[0044] The return pipe 16 consists of a first return pipe 16a and a second return pipe 16b. The third port of the second three-way valve 20 is connected to one end of the first return pipe 16a, the other end of the first return pipe 16a is connected to the first port of the third three-way valve 21, the second port of the third three-way valve 21 is connected to one end of the second return pipe 16b, and the other end of the second return pipe 16b is matched with the upper part of the drying tower 1.

[0045] The input end of the second cyclone separator 22 cooperates with the upper part of the drying tower 1, the first output end of the second cyclone separator 22 is connected to the input end of the dust collector 17, and the second output end of the second cyclone separator 22 is connected to the third port of the third three-way valve 21.

[0046] The dual-flow spray granulation process includes the following steps:

[0047] S1, turn on the induced draft fan 18, the negative pressure generated by the induced draft fan 18 passes through the dust collector 17 and the corresponding pipeline to produce a suction effect on the drying tower 1, and the first air supply heating unit outputs the heated air flow from the upper part of the drying tower 1 into the drying tower 1.

[0048] S2, the second air supply heating unit outputs the heated air flow to the fluidizing unit, and the hot air flow flows into the drying tower 1 from bottom to top, and the third air supply fan 13 is turned on. The wind generated by the third air supply fan 13 passes through the first three-way valve 14, the first cyclone separator 19, the second three-way valve 20, the third three-way valve 21, and the return pipe 16 into the drying tower 1 in sequence.

[0049] S3, the first feeding spray unit sprays the wet material into the drying tower 1, and the mist sprayed by the first feeding spray unit is heated by the hot air, that is, heated by the hot air generated by the first air supply heating unit. After the water in the mist is evaporated, the remaining fine particles move to the lower part of the drying tower 1 under the action of gravity.

[0050] S4, the second feeding spray unit sprays the wet material into the fluidizing unit, the mist sprayed by the second feeding spray unit is heated by hot air, and the water in the mist is evaporated to form fine particles, which collide with the fine particles from the upper part of the drying tower 1 and agglomerate to form coarse particles. When the specific gravity of the coarse particles increases to overcome the force of the hot air blown out by the second air supply heating unit, the coarse particles settle on the orifice plate 7 in the fluidizing unit, and the coarse particles on the orifice plate 7 are dried under the action of the hot air and move toward the output port 8, and are finally discharged from the output port 8.

[0051] S5. The material discharged from the output port 8 includes coarse particles and powder. The coarse particles and powder enter the first three-way valve 14. Under the pushing action of the wind generated by the third blower 13, the coarse particles and powder enter the first cyclone separator 19. After separation by the first cyclone separator 19, most of the powder is output to the second three-way valve 20. The coarse particles and a small amount of powder enter the screening component 15. After screening by the screening component 15, the coarse particles are output from the coarse particle output end of the screening component 15 and packaged. The powder is output from the powder output end of the coarse screening component 15 and enters the second three-way valve 20. The powder in the second three-way valve 20 enters the drying tower 1 through the return pipe 16 under the negative pressure force in the drying tower 1 and is re-granulated in the drying tower 1. In addition, the air flow entering the second cyclone separator 22 contains powder, most of which enters the dust collector 17 under the action of the induced draft fan 18, and a small amount of powder passes through the third three-way valve 21 and enters the return pipe 16, and finally returns to the drying tower 1 along the return pipe.

Claims

1. Double-flow spray granulation dryer, including: Drying tower (1); The wet material is sprayed into a first feeding spray unit inside the drying tower (1), wherein the output end of the first feeding spray unit is matched with the upper part of the drying tower (1); A first air supply heating unit for heating the mist sprayed from the first feeding spray unit, wherein the output end of the first air supply heating unit is matched with the upper part of the drying tower (1); characterized in that it also includes: A fluidizing unit, wherein after the fluidizing unit is connected to the output end of the drying tower (1), the inner cavity of the fluidizing unit communicates with the inner cavity of the drying tower (1), and an output port (8) is provided on the fluidizing unit; a second feeding spray unit for spraying the wet material into the fluidizing unit to polymerize with the material dried in the drying tower (1) and moving downward, wherein the output end of the second feeding spray unit cooperates with the fluidizing unit; The second air supply and heating unit dries the material, and the output end of the second air supply and heating unit cooperates with the fluidizing unit.

2. The double-flow spray granulation dryer according to claim 1, characterized in that The fluidizing unit comprises a connecting assembly (6), a perforated plate (7) having a vent hole (7a), an output port (8) located on the connecting assembly (6), the perforated plate (7) being installed inside the connecting assembly (6), the axial direction of the vent hole (7a) being inclined relative to the axial direction of the connecting assembly (6), and the inclination direction of the vent hole (7a) being biased toward the output port (8) on the fluidizing unit.

3. The double-flow spray granulation dryer according to claim 2, characterized in that: The connecting assembly (6) comprises an upper cylinder (6a), a lower cylinder (6b), and a movable cylinder (6c); one end of the upper cylinder (6a) is fixed to the output end of the drying tower (1); one end of the movable cylinder (6c) is inserted into the lower cylinder (6b) and is clearance-matched with the lower cylinder (6b); the orifice plate (7) is fitted in the inner hole (6d) of the movable cylinder (6c); and the movable cylinder (6c) moves axially along the lower cylinder (6b) to form a connection with or separation from the upper cylinder (6a).

4. The double-flow spray granulation dryer according to claim 3, characterized in that: The inner hole (6d) of the movable cylinder (6c) is a stepped hole, and the orifice plate (7) is located in the stepped hole; When the movable cylinder (6c) is combined with the upper cylinder (6a), the other end of the upper cylinder (6a) is inserted into the step hole, and the orifice plate (7) is pressed between the other end of the upper cylinder (6a) and the step surface of the step hole.

5. The double-flow spray granulation dryer according to claim 3, characterized in that: The connecting assembly (6) further includes a lifting driver (6f) for driving the movable cylinder (6c) to lift and lower. A flange (6g) is provided on the peripheral surface of the other end of the movable cylinder (6c), and the lifting driver (6f) is connected to the flange (6g).

6. The double-flow spray granulation dryer according to claim 3, characterized in that: The connecting assembly (6) further comprises a first sealing ring (6h) and a second sealing ring (6k). A first annular groove is provided on the circumferential surface of the other end of the upper cylinder (6a). The first sealing ring (6h) is installed in the first annular groove on the upper cylinder (6a) to seal the gap between the upper cylinder (6a) and the movable cylinder (6c). A second annular groove is provided on the circumferential surface of the movable cylinder (6c). The second sealing ring (6k) is installed in the first annular groove to seal the movable cylinder (6c) and the lower cylinder (6b).

7. The double-flow spray granulation dryer according to claim 3, characterized in that: The connecting assembly (6) further comprises a limiting component (6j) for limiting the position of the movable cylinder (6c) rising axially along the lower cylinder (6b); the limiting component (6j) is sleeved on the upper cylinder (6a) and fixed to the upper cylinder (6a).

8. The dual-flow spray granulation dryer according to any one of claims 1 to 7, characterized in that: The apparatus further comprises a third air blower (13), a first three-way valve (14), a screening component (15), a return pipe (16), a dust collector (17), and an induced draft fan (18); the output end of the third air blower (13) is connected to the first port of the first three-way valve (14), the second port of the first three-way valve (14) is connected to the output port (8) on the fluidizing unit, and the third port of the first three-way valve (14) is connected to the input end of the screening component (15); The screening component (15) is provided with a coarse particle material output end and a powder material output end. The powder material output end of the screening component (15) is connected to one end of a return pipe (16). The other end of the return pipe (16) is matched with the upper part of the drying tower (1). The input end of the dust collector (17) is matched with the upper part of the drying tower (1). The induced draft fan (18) is connected to the dust collector (17).

9. The double-flow spray granulation dryer according to claim 8, characterized in that: It also includes a first cyclone separator (19), a second three-way valve (20), a third three-way valve (21), and a second cyclone separator (22); The input port of the first cyclone separator (19) is connected to the third port of the first three-way valve (14), the first output port of the first cyclone separator (19) is connected to the input end of the screening component (15), the second output port of the first cyclone separator (19) is connected to the first port of the second three-way valve (20), and the second port of the second three-way valve (20) is connected to the powder output end of the screening component (15); The return pipe (16) is composed of a first return pipe (16a) and a second return pipe (16b); the third port of the second three-way valve (20) is connected to one end of the first return pipe (16a); the other end of the first return pipe (16a) is connected to the first port of the third three-way valve (21); the second port of the third three-way valve (21) is connected to one end of the second return pipe (16b); and the other end of the second return pipe (16b) is matched with the upper part of the drying tower (1); The input end of the second cyclone separator (22) is matched with the upper part of the drying tower (1), the first output end of the second cyclone separator (22) is connected to the input end of the dust collector (17), and the second output end of the second cyclone separator (22) is connected to the third port of the third three-way valve (21).

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