Centrifugal spray dryer

Abstract

The utility model discloses a centrifugal spray dryer, which solves the problems of insufficient drying and poor equipment stability caused by short material flow in a drying tower of an existing centrifugal spray machine. The device comprises a rack, a drying tower, an air distributor, a cyclone separator, a centrifugal atomizer, an electric heater, an air feeder, an induced draft fan and a filter, and is characterized in that two guide plates are symmetrically fixed on the two sides of the inner wall of the drying tower respectively, and arc-shaped walls are arranged on the upper surfaces of the guide plates; and damping cushioning devices are respectively arranged at the bottom end of the rack through four supporting legs. The flow of atomized materials and hot air is prolonged due to the arrangement of the flow guide plate and the arc-shaped wall, the flow state and the flow speed of the materials are adjusted, the materials are fully dried, vibration generated in the operation process of the material drying device is effectively relieved due to the arrangement of the damping cushioning device, the stable performance of the device is improved, and stable drying of the materials is achieved.

Description

Technical Field

[0001] The utility model relates to a general physical device for obtaining dry solids by spraying steam, in particular to a centrifugal spray dryer. Background Art

[0002] As we all know, a centrifugal spray dryer is a commonly used drying equipment. Its working principle is to use high-speed centrifugal force to atomize liquid materials into tiny particles through a nozzle. The hot air quickly evaporates the water, resulting in a solid powder product. The core of the centrifugal spray dryer lies in atomization and hot air. First, the air is heated by a heater to become hot air. Then, a blower sends it into the hot air distributor at the top of the drying tower, where it enters the drying tower evenly. Simultaneously, the feed liquid is pumped by a screw pump to the centrifugal atomizer installed at the top of the drying tower, forming a tiny mist droplet. Inside the drying tower, the feed liquid and the hot air come into contact with each other, rapidly evaporating the water and drying the finished product in a very short time. The majority of the powder product is collected and packaged in the lower cone of the drying tower. The wet air then flows through an air pipeline to a cyclone separator for further gas-solid separation, collecting the small amount of solid material carried by the wet air. Finally, the gas is discharged through a filter. For example, the Chinese utility model patent specification CN205435010U, published on August 10, 2016, discloses a "centrifugal spray dryer" comprising a drying chamber, a hot air volute, an electric heater connected to the hot air volute via a hot air straight channel, the hot air volute connected to the drying chamber via an air distributor, an electric atomizer within the drying chamber, a cyclone separator connected to the bottom of the tower, a material collection bucket below the cyclone separator, and a cyclone pump connected to the cyclone separator. Its operating principle is similar to that of commercial centrifugal spray dryers: high-temperature hot air generated by an electric heater enters the drying chamber through the hot air volute at the top of the drying chamber. The air distributor generates a uniformly rotating airflow that enters the drying chamber and maintains uniform air distribution within the tower. Liquid material passes through the high-speed rotating electric atomizer, producing a dispersed, fine mist. This mist comes into contact with the rotating hot air, rapidly evaporating moisture and drying the material in a very short time. However, the internal structure of the drying tower of the centrifugal spray dryer disclosed above is a straight channel, which has the disadvantages of too fast material discharge, short material flow, and insufficient drying. In addition, the centrifugal spray dryer is prone to vibration during operation, and its stability needs to be improved. Summary of the Invention

[0003] The utility model aims to provide a centrifugal spray dryer to solve the problems of insufficient drying and poor equipment stability caused by the short material flow in the drying tower of the existing centrifugal spray dryer.

[0004] To achieve the above-mentioned purpose, the utility model solves the technical problem thereof by adopting the following technical solution: a centrifugal spray dryer, which comprises a frame, a drying tower, an air distributor, a cyclone separator, a centrifugal atomizer, an electric heater, a blower, an induced draft fan and a filter, wherein the drying tower and the cyclone separator are respectively arranged inside the frame, and the cyclone separator is located on one side of the drying tower; the bottom end of the lower cone of the drying tower is connected with a feed pipe, and one side of the lower cone of the drying tower is connected to the cyclone separator through an air supply pipe; the blower is connected to the drying tower through an electric heater, an air supply pipe and an air distributor; the centrifugal atomizer is installed at the bottom of the drying tower The top end of the drying tower is connected to the centrifugal atomizer, and a feed pipe is connected to the centrifugal atomizer; the cyclone separator is connected to the filter through an induced air pipe and an induced draft fan; a discharge pipe is connected to the bottom end of the cyclone separator; an exhaust pipe is connected to the top end of the filter; the electric heater is electrically connected to a temperature controller; the centrifugal atomizer, induced draft fan and blower are all electrically connected to a controller, and is characterized in that: two guide plates are symmetrically fixed on both sides of the inner wall of the drying tower, and arc-shaped walls are provided on the upper surfaces of the guide plates; four support legs are connected to the bottom end of the frame, the support legs are symmetrically arranged in pairs and damping shock absorbers are respectively installed at the bottom of the support legs.

[0005] Preferably, the guide plates are all inclined at 30° on the inner wall of the drying tower, and the guide plates are staggered up and down along the vertical direction.

[0006] Preferably, the damping shock absorber includes a base, a shock-absorbing spring, an adjusting nut, a screw, an upper connecting plate, a socket sleeve, a damping sleeve and an outer sleeve. The outer sleeve is fixed to the upper surface of the base, the damping sleeve is fixed in the outer sleeve, the shock-absorbing spring is arranged in the damping sleeve and the bottom end of the shock-absorbing spring is connected to the upper surface of the base, the top end of the shock-absorbing spring is connected to the screw through the adjusting nut, the upper connecting plate is fixed on the screw, the socket sleeve is fixed to the bottom of the upper connecting plate, and the socket sleeve is correspondingly inserted in the damping sleeve.

[0007] Preferably, the filter comprises a filter box, and three activated carbon filters are provided inside the filter box, and the three activated carbon filters are distributed in a rectangular array along the vertical direction.

[0008] Preferably, an observation window is provided on the tower body of the drying tower.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] (1) The utility model is characterized in that two guide plates are symmetrically fixed on both sides of the inner wall of the drying tower, and arc-shaped walls are provided on the upper surfaces of the guide plates. The centrifugal atomizer atomizes the wet material and sprays it into the drying tower. At the same time, the air is heated by the electric heater to become hot air, and then sent to the hot air distributor on the top of the drying tower by the blower and evenly enters the drying tower. The hot air flows along with the atomized material under the guidance of the guide plates inside the drying tower. The guide plates extend the flow of the wet material and the hot air. At the same time, the arc-shaped walls on the guide plates adjust the flow state and flow rate of the material, thereby achieving full drying of the material.

[0011] (2) The utility model is provided with a damping shock absorber at the bottom of the frame through the supporting legs, which effectively alleviates the vibration generated during the drying operation of the centrifugal spray dryer, improves the stability of the equipment, and realizes stable drying of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A structural diagram of the utility model;

[0013] Figure 2 This is a schematic structural diagram of the damping shock absorber of the utility model;

[0014] Figure 3 This is a circuit block diagram of the utility model.

[0015] Markings in the figure: 1. Feed pipe, 2. Centrifugal atomizer, 3. Air distributor, 4. Cyclone separator, 5. Air duct, 6. Induced draft fan, 7. Exhaust pipe, 8. Filter, 81. Filter box, 82. Activated carbon filter, 9. Damping shock absorber, 91. Base, 92. Shock absorber spring, 93. Adjusting nut, 94. Screw, 95. Upper connecting plate, 96. Socket sleeve, 97. Damping sleeve, 98. Outer jacket, 10. Discharge pipe, 11. Air supply pipe, 12. Controller, 13. Feeding pipe, 14. Blower, 15. Thermostat, 16. Electric heater, 17. Rack, 18. Air supply pipe, 19. Drying tower, 20. Observation window, 21. Guide plate, 22. Curved wall, 23. Support leg. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] exist Figure 1In the invention, a centrifugal spray dryer includes a frame 17, a drying tower 19, an air distributor 3, a cyclone separator 4, a centrifugal atomizer 2, an electric heater 16, a blower 14, an induced draft fan 6 and a filter 8. The above components and their relationships are the same as those in the prior art.

[0018] like Figure 1 As shown, the drying tower 19 and the cyclone separator 4 are respectively fixedly arranged inside the frame 17 , and the cyclone separator 4 is located on one side of the drying tower 19 .

[0019] exist Figure 1 In the figure, the lower cone bottom of the drying tower 19 is connected with a feed pipe 13. The dry powdered product formed in the drying tower 19 is collected by the lower cone of the drying tower 19 and is exported and packaged by the feed pipe 13.

[0020] exist Figure 1 In the embodiment, the blower 14 is connected to the drying tower 19 through the electric heater 16, the air supply pipe 18, and the air distributor 3. Figure 1 As shown, electric heater 16 is fixed to one side of the interior of frame 17 via a support plate and has a power of 15 kW. Blower 14 is mounted on the bottom of frame 17. The air inlet of electric heater 16 is connected to blower 14 via an air duct. The air outlet of electric heater 16 is connected to air distributor 3 via air duct 18. Air distributor 3 is mounted on top of drying tower 19 and is connected to the interior of drying tower 19.

[0021] exist Figure 1 In the embodiment, centrifugal atomizer 2 is mounted on the top of drying tower 19 via a flange, and a feed pipe 1 is connected to centrifugal atomizer 2. Feed pipe 1 can be connected to a material pump to pump in liquid material. Centrifugal atomizer 2 uses an LPG-5 centrifugal atomizer with a power of 300W.

[0022] exist Figure 1 In the drying tower, one side of the lower cone is connected to the cyclone separator 4 through the air pipe 11. The wet air separated in the drying tower 19 enters the cyclone separator 4 through the air pipe 11 for further gas-solid separation.

[0023] exist Figure 1 In the embodiment, the cyclone separator 4 is connected to the filter 8 through the air duct 5 and the induced draft fan 6, and the top of the filter 8 is connected to the exhaust pipe 7. Figure 1 As shown, the induced draft fan 6 is installed on the upper side of the frame 17. The induced draft fan 6 transports the waste gas separated from the gas and solid in the cyclone separator 4 into the filter 8 through the induced air pipe 5. The waste gas is filtered by the filter 8 and then discharged through the exhaust pipe 7.

[0024] exist Figure 1In the embodiment, a discharge pipe 10 is connected to the bottom end of the cyclone separator 4. The wet air is further separated into gas and solid in the cyclone separator 4, and a small portion of solid materials separated from the wet air is output and collected by the discharge pipe 10.

[0025] exist Figure 1 、 Figure 3 In the embodiment, the electric heater 16 is electrically connected to a temperature controller 15. Figure 1 As shown, the thermostat 15 adopts the SDC35 thermostat, and its corresponding electric heater 16 is fixed on the other side of the frame 17.

[0026] exist Figure 1 、 Figure 3 The centrifugal atomizer 2, the induced draft fan 6 and the blower 14 are all electrically connected to a controller 12. It should be noted that the controller 12 adopts an AT89S52 controller. Figure 1 As shown, it is installed at the bottom of the frame 17 near the lower position of the gas pipe 11.

[0027] Once again, if Figure 3 As shown, the controller 12 and the thermostat 15 are both electrically connected to an external power source.

[0028] exist Figure 1 In the embodiment, two guide plates 21 are symmetrically fixed on both sides of the inner wall of the drying tower 19. Figure 1 As shown, an arcuate wall 22 is provided on the upper surface of the guide plate 21. The setting of the guide plate 21 extends the flow distance of the material; the setting of the arcuate wall 22 effectively adjusts the flow state and flow rate of the material, promotes the flow of the material, and is conducive to the full drying of the material.

[0029] It should be further explained that in order to achieve reliable flow guiding effect of the guide plate 21, Figure 1 As shown, the four guide plates 21 on the inner wall of the drying tower 19 are all inclined at 30 degrees, and the guide plates 21 are staggered up and down in the vertical direction.

[0030] exist Figure 1 In the embodiment, four support legs 23 are connected to the bottom end of the frame 17. The support legs 23 are symmetrically arranged in pairs and a damping shock absorber 9 is installed at the bottom of each support leg 23. The damping shock absorber 9 can effectively alleviate the vibration generated by the equipment during operation, so that the equipment can operate stably.

[0031] It needs to be further explained that in Figure 2 In the embodiment, the damping shock absorber 9 includes a base 91, a shock absorbing spring 92, an adjusting nut 93, a screw 94, an upper connecting plate 95, a socket 96, a damping sleeve 97 and an outer sleeve 98. Figure 2As shown, the outer sleeve 98 is fixed to the upper surface of the base 91, the damping sleeve 97 is fixed in the outer sleeve 98, the damping spring 92 is arranged in the damping sleeve 97, and the bottom end of the damping spring 92 contacts and is fixedly connected to the upper surface of the base 91. The top end of the damping spring 92 is connected to the screw 94 through the adjusting nut 93. The upper connecting plate 95 is fixed on the screw 94. The socket sleeve 96 is fixed to the bottom of the upper connecting plate 95, and the socket sleeve 96 is correspondingly inserted into the damping sleeve 97. In this embodiment, the damping spring 92, the socket sleeve 96 and the damping sleeve 97 cooperate to effectively alleviate the vibration generated during the drying operation of the dryer, thereby improving the stability of the centrifugal spray dryer of the present invention and achieving stable drying of the material.

[0032] It should be further explained that the filter 8 can be a conventional mesh filter or a filter of other structures. Figure 1 As shown, filter 8 includes a filter housing 81, within which are disposed three activated carbon filters 82 arranged in a vertically arranged rectangular array. It should be noted that each of the three activated carbon filters 82 is formed by a layer of granular activated carbon disposed within the filter housing. The activated carbon filters 82 are capable of adsorbing and filtering the exhaust gas, removing impurities therein and thereby purifying the exhaust gas.

[0033] In order to further reliably visualize the internal situation of the drying tower 19, as Figure 1 As shown, an observation window 20 is sealed on the tower body of the drying tower 19 .

[0034] The working principle of the present invention is as follows: when an external power supply is connected, the temperature controller 15 and the controller 12 are powered and work; wherein, the power supply of the centrifugal spray dryer is turned on by the controller 12, and the centrifugal spray dryer works; the liquid material is fed into the centrifugal atomizer 2 through the feed pipe 1 via the material pump, and the centrifugal atomizer 2, under the control of the controller 12, atomizes the liquid material into extremely small mist droplets and sprays them into the drying tower 19; at the same time, the temperature controller 15 controls the electric heater 16 to generate heat, thereby heating the air fed by the blower 14 into hot air, and the hot air is fed into the drying tower 19 through the air supply pipe 18 and the air distributor 3; in the drying tower, the atomized liquid and the hot air are in contact with each other in parallel, the water evaporates rapidly, and the product is dried into a powdered product in a very short time. The innovation of the present invention is that, in order to prevent the atomized liquid and hot air from being discharged too quickly in the drying tower and the material flow being short, the guide plate 20 and the curved wall 22 on the guide plate 21 are provided, which effectively prolongs the flow of the atomized material and the hot air, so that the atomized material can be fully dried, thereby improving the material drying efficiency; at the same time, the curved wall 22 on the guide plate 21 adjusts the flow state and flow rate of the atomized material, thereby ensuring the fluidity of the material; the dry powder product formed in the drying tower 19 is collected by the lower cone of the drying tower 19 The wet air separated in the drying tower 19 is then fed into the cyclone separator 4 through the air pipe 11, and the wet air is further separated into gas and solid by the internal cyclone. A small part of the solid material separated from the wet air is output and collected by the discharge pipe 10. The exhaust gas formed after the gas-solid separation in the cyclone separator 4 is fed into the filter 8 through the induced draft fan 6 through the induced draft pipe 5, and is purified by adsorption filtration through the filter 8. The purified gas is discharged through the exhaust pipe 7.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal spray dryer comprising a frame, a drying tower, an air distributor, a cyclone separator, a centrifugal atomizer, an electric heater, a blower, an induced draft fan and a filter, wherein: The drying tower and cyclone separator are respectively arranged inside the frame, and the cyclone separator is located on one side of the drying tower; the bottom end of the lower cone of the drying tower is connected to a feed pipe, and one side of the lower cone of the drying tower is connected to the cyclone separator through an air supply pipe; the blower is connected to the drying tower through an electric heater, an air supply pipe, and an air distributor; the centrifugal atomizer is installed at the top of the drying tower, and a feed pipe is connected to the centrifugal atomizer; the cyclone separator is connected to the filter through an air duct and an induced draft fan The drying tower is characterized in that two guide plates are symmetrically fixed on both sides of the inner wall of the drying tower, and an arc-shaped wall is provided on the upper surface of the guide plates; four supporting legs are connected to the bottom end of the frame, and the supporting legs are symmetrically arranged in pairs and damping shock absorbers are respectively installed at the bottom of the supporting legs.

2. A centrifugal spray dryer according to claim 1, characterized in that: The guide plates are all inclined at 30 degrees on the inner wall of the drying tower, and are staggered up and down along the vertical direction.

3. A centrifugal spray dryer according to claim 1, characterized in that: The damping shock absorber includes a base, a shock-absorbing spring, an adjusting nut, a screw, an upper connecting plate, a socket sleeve, a damping sleeve and an outer sleeve. The outer sleeve is fixed to the upper surface of the base, the damping sleeve is fixed in the outer sleeve, the shock-absorbing spring is arranged in the damping sleeve and the bottom end of the shock-absorbing spring is connected to the upper surface of the base, the top end of the shock-absorbing spring is connected to the screw through the adjusting nut, the upper connecting plate is fixed on the screw, the socket sleeve is fixed to the bottom of the upper connecting plate, and the socket sleeve is correspondingly inserted into the damping sleeve.

4. A centrifugal spray dryer according to claim 1, characterized in that: The filter comprises a filter box, inside which three activated carbon filter screens are arranged, and the three activated carbon filter screens are distributed in a rectangular array along the vertical direction.

5. A centrifugal spray dryer according to claim 1, characterized in that: An observation window is provided on the tower body of the drying tower.

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