A spray drying tower

Abstract

The utility model discloses a spray drying tower, comprising a drying tower, an air inlet, an exhaust port, a reflux pipe, a first collecting barrel and a bracket, wherein the drying tower is fixedly mounted on the bracket, an atomizer is arranged on the top of the drying tower, the air inlet is arranged on the side wall of the drying tower below the atomizer, and the shell of the drying tower below the air inlet comprises an outer shell and an inner shell, wherein the inner shell is provided with a plurality of through holes. The beneficial effects of the utility model are as follows: a small amount of solid material exists in the waste gas generated after the material is dried by hot air, which is sucked in by the reflux pipe and collected by the bag filter, thereby avoiding waste of resources, and the gas after dust removal flows into the space between the outer shell and the inner shell of the drying tower through a one-way valve, thereby heat-insulating the drying tower, effectively utilizing the waste heat in the waste gas, and improving the heat utilization rate, and the waste gas in the space is blown into the drying tower through the through holes on the inner shell, thereby blowing the material in the drying tower to the middle, thereby avoiding the phenomenon of material hanging on the wall.

Description

Technical Field

[0001] The utility model relates to the technical field of drying towers, in particular to a spray drying tower. Background Art

[0002] Spray drying is a thermal process that makes liquid materials pass through nozzles and atomize into fine mist droplets, which then come into contact with heat medium in the drying tower and are dried into powder. The feed can be a solution, suspension or paste, and atomization can be achieved by rotary atomizers, pressure atomizing nozzles and airflow atomizing nozzles.

[0003] A patent document with announcement number CN207187140U discloses a spray dryer for producing sodium tripolyphosphate. The hot air flow after reacting with the mist droplets enters the hot air flow reflux chamber formed between the outer shell and the inner shell of the dryer through the reflux inlet of the inner shell of the dryer, heating the inner shell of the dryer, preventing the liquid from adhering to the inner wall of the dryer, and fully utilizing the waste heat of the hot air flow to keep the dryer warm, reducing the heat energy loss of the hot air flow, and also reducing the production cost of the enterprise.

[0004] However, when the hot air flow enters the above-mentioned spray dryer from the reflux inlet, the dried solid material will also enter the hot air flow reflux chamber from the reflux inlet, and the raw material collection is incomplete, resulting in waste of resources, and the atomized liquid with insufficient moisture will be blown to the inner wall of the high-temperature drying tower with the gas, causing the liquid to adhere to the inner wall of the dryer, resulting in waste of material. Utility Model Content

[0005] In view of the above-mentioned prior art, the utility model provides a spray drying tower to solve the problems existing in the above-mentioned background technology.

[0006] To achieve the above purpose, the technical solution of the embodiment of the utility model is implemented as follows:

[0007] A spray drying tower comprises a drying tower, an air inlet, an exhaust port, a reflux pipe, a collecting barrel and a bracket, wherein the drying tower is fixedly mounted on the bracket, an atomizer is arranged on the top of the drying tower, the air inlet is arranged on the side wall of the drying tower below the atomizer, the shell of the drying tower below the air inlet comprises an outer shell and an inner shell, a discharge port is arranged on the bottom of the drying tower, the collecting barrel is located below the discharge port, one end of the reflux pipe is fixedly connected to the drying tower shell above the discharge port, and the other end is fixedly connected to the outer shell, and the inner shell on one side of the reflux pipe is provided with a plurality of A through hole is provided in the reflux duct, a first suction fan, a bag dust collector and a one-way valve, the reflux gas passes through the first suction fan, the dust collector and the one-way valve in sequence, the exhaust port is located above the discharge port, the exhaust port is fixedly connected to the exhaust duct, the vertical duct side wall of the exhaust duct is fixedly connected to the first filter screen, the side wall of the exhaust duct is provided with a first support block, the lower pipe outlet of the exhaust duct is fixedly connected to the drying tower shell above the discharge port, the first filter screen is fixedly connected to the second suction fan, and the second suction fan is fixed on the top of the first support block.

[0008] Preferably, a heat-insulating material is provided on the outside of the return pipe.

[0009] Preferably, a fan is provided above the inner wall of the horizontal exhaust duct.

[0010] Preferably, a second filter screen is provided at the bottom of the discharge port.

[0011] Preferably, a second supporting block is provided on the bracket, a vibrator is fixedly connected to the second supporting block, and the vibrator is fixedly connected to the second filter screen.

[0012] Preferably, a sealing ring is provided at the bottom of the discharge port, and the discharge port is connected to the collection bucket via the sealing ring.

[0013] Preferably, the atomizer is a centrifugal atomizer.

[0014] The beneficial effect of the utility model is that a small amount of solid material exists in the waste gas generated after the material is dried with hot air, which is sucked in by the reflux pipe and collected by the bag dust collector, thus avoiding waste of resources; the gas after dust removal flows into the space between the outer shell and the inner shell of the drying tower through the one-way valve, thus insulating the drying tower, effectively utilizing the waste heat in the waste gas and improving the heat utilization rate; the waste gas in the space is blown into the drying tower through the through holes on the inner shell, thus blowing the material in the drying tower to the middle and avoiding the phenomenon of material hanging on the wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a spray drying tower in an embodiment of the present application;

[0016] Figure 2 This is an enlarged schematic diagram of the through hole at position A in the embodiment of the present application;

[0017] Description of Figure Numbers:

[0018] 1. Drying tower; 2. Air inlet; 3. Exhaust outlet; 4. Reflux duct; 5. Collecting bucket; 6. Bracket; 7. Atomizer; 8. Outer shell; 9. Inner shell; 10. Discharge outlet; 11. Through hole; 12. First suction fan; 13. Bag filter; 14. One-way valve; 15. Exhaust duct; 16. First filter; 17. First support block; 18. Second suction fan; 19. Fan; 20. Second filter; 21. Second support block; 22. Vibrator; 23. Sealing ring; DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further elaborated in detail below in conjunction with the drawings and specific embodiments of the specification. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the utility model. The terms used herein in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. In the following description, the expression "some embodiments" is involved, which describes a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0020] It should also be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "inside", "outside", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0021] Example 1

[0022] Please refer to Figure 1-2The present application provides a spray drying tower, comprising a drying tower 1, an air inlet 2, an exhaust port 3, a reflux pipe 4, a collecting barrel 5 and a bracket 6, wherein the drying tower 1 is fixedly mounted on the bracket 6, an atomizer 7 is provided on the top of the drying tower 1, the air inlet 2 is provided on the side wall of the drying tower 1 below the atomizer 7, the shell of the drying tower 1 below the air inlet 2 comprises an outer shell 8 and an inner shell 9, a discharge port 10 is provided at the bottom of the drying tower 1, the collecting barrel 5 is located below the discharge port 10, one end of the reflux pipe 4 is fixedly connected to the shell of the drying tower 1 above the discharge port 10, and the other end is fixedly connected to the outer shell 8, and the inner shell 9 on one side of the reflux pipe 4 is provided with a plurality of through holes 11, the reflux duct 4 is provided with a first suction fan 12, a bag dust collector 13 and a one-way valve 14, the reflux gas passes through the first suction fan 12, the dust collector and the one-way valve 14 in sequence, the exhaust port 3 is located above the discharge port 10 and the drying tower 1 shell, the exhaust port 3 is fixedly connected to the exhaust duct 15, the vertical duct side wall of the exhaust duct 15 is fixedly connected to the first filter 16, the side wall of the exhaust duct 15 is provided with a first support block 17, the lower pipe mouth of the exhaust duct 15 is fixedly connected to the drying tower 1 shell above the discharge port 10, the first filter 16 is fixedly connected to the second suction fan 18, and the second suction fan 18 is fixed to the top of the first support block 17.

[0023] The dry hot air enters the drying tower 1 through the air inlet 2 to be heated, ensuring that the feed liquid can be dried quickly after entering the drying tower 1 to avoid material hanging on the wall. When the temperature in the drying tower 1 reaches a certain value, the feed liquid is atomized into droplets by the atomizer 7 and sprayed into the drying tower 1. After the mist liquid encounters the hot air from the air inlet 2, the water can evaporate quickly, and the generated solid material falls downward due to gravity and enters the collection barrel 5 through the discharge port 10, thereby improving the work efficiency. Since there is a small amount of solid material in the exhaust gas generated after drying, the exhaust gas is sucked into the reflux pipe 4 through the first suction fan 12, and the small amount of solid material in the exhaust gas is collected through the bag dust collector 13, thereby avoiding waste of resources. The exhaust gas flows into the space between the outer shell 8 and the inner shell 9 of the drying tower 1 through the one-way valve 14, thereby heat-insulating the drying tower 1, effectively utilizing the waste heat in the exhaust gas and improving the heat utilization rate. The exhaust gas in the space passes through the through hole 11 on the inner shell 9 and is blown into the drying tower 1, blowing the materials in the drying tower 1 to the middle to avoid the material hanging on the wall. The exhaust pipe 15 sucks out the exhaust gas in the drying tower 1 through the second suction fan 18 to reduce the air pressure in the tower and avoid damage to the drying tower 1. A first filter 16 is provided at the interface between the second suction fan 18 and the exhaust pipe to intercept a small amount of solid materials in the exhaust gas. The intercepted solid materials eventually flow into the collection bucket 5 through the exhaust pipe, thereby avoiding waste of materials.

[0024] Furthermore, a heat preservation material is arranged on the outside of the return pipe 4. The waste gas is processed through the return pipe 4 and enters the drying tower 1 again to perform secondary drying on the material. The heat preservation material is wrapped on the outside of the return pipe 4, which reduces the heat loss in the waste gas and improves the waste heat utilization rate of the waste gas.

[0025] Furthermore, a fan 19 is provided above the inner wall of the horizontal pipe of the exhaust duct 15. During the exhaust gas discharge process, a small amount of solid materials will be intercepted by the first filter screen 16 in the exhaust duct 15. The solid materials are blown downward by the fan 19 above the inner wall of the horizontal pipe of the exhaust duct 15, and flow into the collection barrel 5 through the pipe, thereby preventing the solid materials from being adsorbed on the filter screen, causing the filter screen to be blocked and the wind force to be reduced, and failing to reduce the air pressure of the drying tower 1, causing damage to the drying tower 1.

[0026] Furthermore, a second filter screen 20 is provided at the bottom of the discharge port 10. When the liquid material is dried into solid material, the material falls down onto the second filter screen 20. While the second filter screen 20 is filtering the material, the hot air in the drying tower 1 is also drying the material on the second filter screen 20 again, thereby ensuring the drying effect.

[0027] Example 2

[0028] Reference Figure 1-2 The difference between this embodiment and the embodiment 1 is that the bracket 6 is provided with a second support block 21, the second support block 21 is fixedly connected with a vibrator 22, and the vibrator 22 is fixedly connected with the second filter screen 20. When the second filter screen 20 filters the material, the vibrator 22 vibrates the second filter screen 20 through the vibration shaft to prevent the material from accumulating on the second filter screen 20 and causing blockage. At the same time, when the second filter screen 20 vibrates, the material expands the heating area, thereby improving the drying efficiency.

[0029] Furthermore, a sealing ring 23 is provided at the bottom of the discharge port 10, and the discharge port 10 is connected to the collecting bucket 5 through the sealing ring 23. The collecting bucket 5 is sealed and connected to the discharge port 10 through the sealing ring 23, which can prevent the exhaust gas from escaping and polluting the environment, and also prevent the dried solid material from falling outside the collecting bucket 5 during the falling process, resulting in material waste.

[0030] Furthermore, the atomizer 7 is a centrifugal atomizer 7. Under the centrifugal force of the centrifugal atomizer 7, the liquid droplets after atomization of the liquid are in the same plane, and can be better dried by the hot air entering horizontally, thereby improving the drying efficiency.

[0031] The use process of the utility model is as follows: when using the utility model, firstly, dry hot air is sent into the drying tower 1 to preheat the drying tower 1 to avoid the material hanging on the wall due to insufficient drying after the feed liquid enters. After the heating is completed, the atomizer 7 atomizes the feed liquid into droplets and sprays it into the drying tower 1. After being dried by the hot air, the generated solid materials fall into the collection bucket 5 by gravity, which improves the working efficiency. The reflux pipe 4 absorbs the dried exhaust gas through the first suction fan 12, and then collects a small amount of solid materials in the exhaust gas through the bag dust collector 13, which avoids the waste of materials. Finally, the exhaust gas flows from the one-way valve 14 to the outer shell 8 of the drying tower 1 and The space between the inner shells 9 is used to insulate the drying tower 1, which effectively utilizes the waste heat of the exhaust gas and improves the heat utilization rate. The exhaust gas in the space is blown into the drying tower 1 through the through holes 11 on the inner shell 9, and the materials floating toward the inner wall of the drying tower 1 are blown to the middle to avoid the materials hanging on the wall. Hot air continuously enters the drying tower 1, and the exhaust gas is discharged through the exhaust pipe 15 to reduce the air pressure in the tower and avoid damage to the drying tower 1. A first filter 16 is set at the interface between the second suction fan 18 and the exhaust pipe to intercept a small amount of solid material in the exhaust gas. The intercepted solid material eventually flows to the collection bucket 5 through the exhaust pipe 15 to avoid waste of materials.

[0032] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. The protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A spray drying tower, characterized in that: It includes a drying tower, an air inlet, an exhaust port, a reflux pipe, a collecting barrel and a bracket. The drying tower is fixedly installed on the bracket. An atomizer is provided on the top of the drying tower. The air inlet is provided on the side wall of the drying tower below the atomizer. The shell of the drying tower below the air inlet includes an outer shell and an inner shell. A discharge port is provided at the bottom of the drying tower. The collecting barrel is located below the discharge port. One end of the reflux pipe is fixedly connected to the drying tower shell above the discharge port, and the other end is fixedly connected to the outer shell. The inner shell on one side of the reflux pipe is provided with a plurality of through holes. The reflux duct is provided with a first suction fan, a bag dust collector and a one-way valve, and the reflux gas passes through the first suction fan, the dust collector and the one-way valve in sequence, the exhaust port is located above the discharge port, the exhaust port is fixedly connected to the exhaust duct, the vertical duct side wall of the exhaust duct is fixedly connected to the first filter screen, the side wall of the exhaust duct is provided with a first support block, the lower pipe outlet of the exhaust duct is fixedly connected to the drying tower shell above the discharge port, the first filter screen is fixedly connected to the second suction fan, and the second suction fan is fixed on the top of the first support block.

2. A spray drying tower according to claim 1, characterized in that: The outer side of the return pipe is provided with a heat-insulating material.

3. A spray drying tower according to claim 1, characterized in that: A fan is arranged above the inner wall of the horizontal pipe of the exhaust pipe.

4. A spray drying tower according to claim 1, characterized in that: The drying tower is provided with a second filter screen, and the second filter screen is located above the discharge port.

5. A spray drying tower according to claim 4, characterized in that: The bracket is provided with a second supporting block, the second supporting block is fixedly connected with a vibrator, and the vibrator is fixedly connected to the second filter screen.

6. A spray drying tower according to claim 1, characterized in that: A sealing ring is provided at the bottom of the discharge port, and the discharge port is connected to the collection bucket through the sealing ring.

7. A spray drying tower according to claim 1, characterized in that: The atomizer is a centrifugal atomizer.

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