Tail powder recovery system

Abstract

The invention discloses a tail powder recovery system, comprising: a spray drying tower having a tail powder outlet and a material inlet; the first tail powder recovery device is used for recovering first tail powder generated by the spray drying tower, and an outlet of the first tail powder recovery device is communicated with the material inlet; the second tail powder recovery device communicates with an external powder conveying system and is used for recovering second tail powder generated by the powder conveying system, and an outlet of the second tail powder recovery device communicates with the material inlet; and the high-pressure gas conveying device is used for applying pressure to the first tail powder recovery device and the second tail powder recovery device respectively, so that the first tail powder and the second tail powder flow into the spray drying tower. According to the tail powder recovery system, the collected tail powder can be directly conveyed into the spray drying tower, the collected tail powder is combined with slurry sprayed in the tower and then subjected to agglomeration and re-granulation, traditional complex processes such as slurrying, pumping and ball milling are avoided, energy is saved, and cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of spray drying, and particularly relates to a tail powder recovery system. Background Art

[0002] A spray drying tower is a device used for preparing ceramic powder during the ceramic production process. The slurry droplets ejected from the nozzle are dehydrated under the action of hot air and dried to form ceramic powder particles containing a certain amount of moisture and particle size. During the spray drying process, the raw material slurry is atomized by an atomizer, contacts the hot air, and quickly evaporates moisture to form dry powder. Most of the dry powder will flow out from the lower cone of the drying tower to be collected, but a small part of the fine particles will flow out of the drying tower following the air flow of the induced draft fan.

[0003] In the prior art, a dust collector is used to recover this part of the tail powder. However, the particle size of the tail powder does not meet the requirements of the press particle gradation and cannot be directly used. Therefore, these tail powders usually need to go through complex processes such as pulping, pumping, and ball milling before they can re-enter the spray drying tower for re-drying, resulting in an increase in production costs and energy waste. Summary of the Invention

[0004] To solve at least one of the problems existing in the above prior art, according to one aspect of the present invention, there is provided a tail powder recovery system, including:

[0005] A spray drying tower having a tail powder outlet and a material inlet;

[0006] A first tail powder recovery device connected to the tail powder outlet for recovering the first tail powder generated by the spray drying tower, and the outlet of the first tail powder recovery device is connected to the material inlet;

[0007] A second tail powder recovery device connected to an external powder conveying system for recovering the second tail powder generated by the powder conveying system, and the outlet of the second tail powder recovery device is connected to the material inlet;

[0008] A high-pressure gas conveying device connected to the first tail powder recovery device and the second tail powder recovery device respectively, for applying pressure to the first tail powder recovery device and the second tail powder recovery device respectively, so that the first tail powder and the second tail powder flow into the spray drying tower.

[0009] In some embodiments, the first tail powder recovery device includes a discharge pipe, a first negative pressure machine, a first dust collector, a first sending bin, and a first conveying pipeline. The discharge pipe is connected between the tail powder outlet and the first dust collector. The first negative pressure machine is connected to the first dust collector. The first sending bin is arranged at the outlet of the first dust collector. The first conveying pipeline is connected between the outlet of the first sending bin and the material inlet.

[0010] In some embodiments, the first tail powder recovery device further includes a first feed valve and a first discharge valve. The first feed valve is arranged at the inlet of the first sending bin, and the first discharge valve is arranged at the outlet of the first sending bin.

[0011] In some embodiments, the first tail powder recovery device includes an aggregate hopper and a plurality of the first dust collectors. The aggregate hopper is arranged at the outlets of the plurality of the first dust collectors and at the inlet of the first sending bin.

[0012] In some embodiments, the second tail powder recovery device includes a second negative pressure machine, a second dust collector, a second sending bin, and a second conveying pipeline. The second dust collector is used to connect to an external powder conveying system. The second negative pressure machine is connected to the second dust collector. The second sending bin is arranged at the outlet of the second dust collector. The second conveying pipeline is connected between the outlet of the second sending bin and the material inlet.

[0013] In some embodiments, the second tail powder recovery device further includes a second feed valve and a second discharge valve. The second feed valve is arranged at the inlet of the second sending bin, and the second discharge valve is arranged at the outlet of the second sending bin.

[0014] In some embodiments, the second tail powder recovery device further includes a conveying mechanism arranged horizontally. The conveying mechanism is arranged at the outlet of the second dust collector and is connected to the inlet of the second sending bin.

[0015] In some embodiments, the high-pressure gas conveying device at least includes a gas storage tank, a first gas supply pipeline, and a second gas supply pipeline. The first gas supply pipeline is respectively connected to the gas storage tank and the first tail powder recovery device. The second gas supply pipeline is respectively connected to the gas storage tank and the second tail powder recovery device.

[0016] In some embodiments, the high-pressure gas conveying device further includes a first fluidization pipeline and a second fluidization pipeline;

[0017] The first fluidization pipeline is connected between the first gas supply pipeline and the first tail powder recovery device, and the outlet of the first fluidization pipeline is located below the outlet of the first gas supply pipeline;

[0018] The second fluidization pipeline is connected between the second air supply pipeline and the second tail powder recovery device, and the outlet of the second fluidization pipeline is located below the outlet of the second air supply pipeline.

[0019] In some embodiments, the high-pressure gas conveying device further includes at least two first control valves and at least two second control valves;

[0020] The first control valves are provided on both the first fluidization pipeline and the first air supply pipeline, and each of the first control valves is respectively used to control the on-off of the air supply of the first fluidization pipeline and the first air supply pipeline;

[0021] The second control valves are provided on both the second fluidization pipeline and the second air supply pipeline, and each of the second control valves is respectively used to control the on-off of the air supply of the second fluidization pipeline and the second air supply pipeline.

[0022] In summary, the tail powder recovery system provided by the present invention has the following technical effects:

[0023] By setting the first tail powder recovery device and the second tail powder recovery device, the tail powder of the spray drying tower and the tail powder generated by other powder conveying systems are respectively recovered. The collected tail powder is directly driven by the high-pressure gas of the high-pressure gas conveying device and enters the spray drying tower through the material inlet. After combining with the slurry sprayed from the spray drying tower, it agglomerates and regranulates, and contacts the hot air flowing in from the air inlet. After re-adjusting the moisture, qualified granular products are obtained, avoiding traditional complex processes such as pulping, pumping, and ball milling, saving energy and reducing costs. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the tail powder recovery system according to an embodiment of the present invention;

[0025] Figure 2 is Figure 1 an enlarged schematic view of part Ⅰ in

[0026] Figure 3 is Figure 1 an enlarged schematic view of part Ⅱ in

[0027] Figure 4 is Figure 3 an enlarged schematic view of part Ⅳ in

[0028] Figure 5 is Figure 1 an enlarged schematic view of part Ⅲ in

[0029] Figure 6 is Figure 5 an enlarged schematic view of part Ⅴ in

[0030] Attached drawings: 100 - Tail powder recovery system, 10 - Spray drying tower, 11 - Tail powder outlet, 12 - Material inlet, 13 - Slurry spraying device, 14 - Air inlet, 15 - First discharge port, 20 - First tail powder recovery device, 21 - Discharge pipe, 22 - First negative pressure machine, 23 - First dust collector, 231 - Second discharge port, 24 - First sending bin, 241 - First arc-shaped docking section, 242 - First transverse diameter section, 243 - First diameter-changing section, 25 - First conveying pipeline, 26 - First feed valve, 27 - First discharge valve, 28 - Aggregate hopper, 29 - Connecting pipeline, 30 - Second tail powder recovery device, 31 - Second negative pressure machine, 32 - Second dust collector, 321 - Suction inlet, 322 - Third discharge port, 33 - Second sending bin, 331 - Second arc-shaped docking section, 332 - Second transverse diameter section, 333 - Second diameter-changing section, 34 - Second conveying pipeline, 35 - Conveying mechanism, 36 - Second feed valve, 37 - Second discharge valve, 40 - High-pressure gas conveying device, 41 - Gas storage tank, 42 - First gas supply pipeline, 43 - Second gas supply pipeline, 44 - First fluidization pipeline, 45 - Second fluidization pipeline, 46 - First control valve, 47 - Second control valve. Detailed implementation mode

[0031] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the attached drawings in the embodiments of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] The present invention will be further described in detail below in conjunction with the attached drawings.

[0035] Please refer to Figures 1 to 6 , which is the tail powder recovery system 100 provided by the embodiment of the present invention, including a spray drying tower 10, a first tail powder recovery device 20, a second tail powder recovery device 30, and a high-pressure gas conveying device 40.

[0036] Among them, the spray drying tower 10 is used to dry the slurry into powder. The spray drying tower 10 has a tail powder outlet 11 and a material inlet 12; the first tail powder recovery device 20 is connected to the tail powder outlet 11 and is used to recover the first tail powder generated by the spray drying tower 10. The outlet of the first tail powder recovery device 20 is connected to the material inlet 12; the second tail powder recovery device 30 is connected to the external powder conveying system and is used to recover the second tail powder generated by the powder conveying system. The outlet of the second tail powder recovery device 30 is connected to the material inlet 12; the high-pressure gas conveying device 40 is respectively connected to the first tail powder recovery device 20 and the second tail powder recovery device 30 and is used to apply pressure to the first tail powder recovery device 20 and the second tail powder recovery device 30 respectively, so that the first tail powder and the second tail powder flow into the spray drying tower 10.

[0037] In the above-mentioned tail powder recovery system 100, by setting the first tail powder recovery device 20 and the second tail powder recovery device 30, the tail powder of the spray drying tower 10 and the tail powder generated by other powder conveying systems are respectively recovered. The collected tail powder is directly driven by the high-pressure gas of the high-pressure gas conveying device 40 to enter the spray drying tower 10 through the material inlet 12, combine with the slurry sprayed on the spray drying tower 10 and then agglomerate, regranulate, contact with the hot air flowing in from the air inlet 14, and re-adjust the moisture to obtain qualified granular products, avoiding traditional complex processes such as pulping, pumping, and ball milling, saving energy and reducing costs.

[0038] It can be understood that, please refer to Figure 2 , a slurry spraying device 13 is further provided on the spray drying tower 10 of this embodiment for spraying slurry into the spray drying tower 10. An air inlet 14 is further provided at the top of the spray drying tower 10 for introducing hot air flow. The high-temperature hot air flow flows in from the air inlet 14 and mixes with the sprayed slurry, and the two conduct heat exchange. The slurry is dehydrated under the action of the hot air flow, and the slurry is quickly dried to obtain powder with a preset moisture content. For example, powder for preparing ceramics is obtained. A first discharge port 15 is provided at the bottom of the spray drying tower 10, and the obtained dried powder flows out from the first discharge port 15 at the bottom of the tower.

[0039] Since most of the powder will flow out from the first discharge port 15 at the lower end when the spray drying tower 10 dries the slurry, but a small part of the fine powder particles will flow out of the drying tower following the air flow. Please refer to Figures 1 to 3 , when the first tail powder recovery device 20 of this embodiment is set, it is used to recover the first tail powder in the spray drying tower 10.

[0040] Specifically, during the setup, the first tail powder recovery device 20 includes an outlet pipe 21, a first negative pressure machine 22, a first dust collector 23, a first sending bin 24, and a first conveying pipeline 25. The outlet pipe 21 is connected between the tail powder outlet 11 and the first dust collector 23. The first negative pressure machine 22 is connected to the first dust collector 23. The first sending bin 24 is arranged at the outlet of the first dust collector 23, that is, the second discharge port 231. The first conveying pipeline 25 is connected between the outlet of the first sending bin 24 and the material inlet 12. In this way, under the suction of the first negative pressure machine 22, the air flow drives some powder particles to flow through the outlet pipe 21 to the first dust collector 23. The first dust collector 23 separates the air flow and the powder. The separated air flow flows out of the first dust collector 23, and the powder particles flow downward by their own gravity to the first sending bin 24. Through the collection of the first sending bin 24 and being conveyed through the first conveying pipeline 25 to the material inlet 12, they unite with the slurry sprayed out by the slurry spraying device 13 and jointly exchange heat with the hot air flow to obtain powder particles with the required particle size.

[0041] Among them, the first dust collector 23 can be a bag dust collector or a cyclone dust collector for dust removal, and it is not limited here. Specifically, the first dust collector 23 in this embodiment adopts a cyclone dust collector.

[0042] Furthermore, when setting up the first dust collector 23, it can be set to 1 or 2 or other quantities, so as to ensure the separation effect of the tail powder through the setting of multiple first dust collectors 23.

[0043] Specifically, two first dust collectors 23 are provided in this embodiment to improve the filtration efficiency through multiple juxtaposed first dust collectors 23 and fully separate the particles carried in the air flow from the air flow.

[0044] Among them, please refer to Figure 3 and Figure 4 , since the first tail powder recovery device 20 is provided with multiple first dust collectors 23, in order to facilitate the concentration of the first tail powder recovered by the first dust collectors 23 into the first sending bin 24, the first tail powder recovery device 20 in this embodiment further includes an aggregate hopper 28. The aggregate hopper 28 is arranged at the outlets of the multiple first dust collectors 23 and at the inlet of the first sending bin 24. In this way, through the setting of the aggregate hopper 28, the powder materials flowing out of the outlets of the multiple first dust collectors 23 can be centrally collected and then centrally discharged into the first sending bin 24, which is convenient for the first sending bin 24 to collect the first tail powder.

[0045] It can be understood that in order to facilitate the movement of the first tail powder centrally into the first sending bin 24, the aggregate hopper 28 is arranged in a funnel shape, so that the first tail powder can gradually move into the first sending bin 24 along the inclined wall surface of the aggregate hopper 28 to achieve the effect of collection.

[0046] Furthermore, due to matching the height of the tail powder outlet 11 of the spray drying tower 10, the first dust collector 23 has a certain setting height. In order to match the height of the second discharge port 231 of the first dust collector 23, a connecting pipe 29 is also provided between the second discharge port 231 of the first dust collector 23 and the collecting hopper 28.

[0047] In addition, when the first sending bin 24 of the present embodiment is set up, in order to ensure the carrying capacity for the tail powder and facilitate the output of the first tail powder from the first sending bin 24, the first sending bin 24 includes a first arcuate docking section 241, a first transverse diameter section 242 and a first diameter-reducing section 243. The first arcuate docking section 241 is provided with an entrance connected to the collecting hopper 28, the first diameter-reducing section 243 has an outlet connected to the first conveying pipe 25, the inner diameter of the first transverse diameter section 242 remains unchanged, thereby ensuring the carrying capacity of the first sending bin 24, and the inner diameter of the first diameter-reducing section 243 gradually decreases from the direction away from the transverse diameter section, so that when the particles flow out of the first sending bin 24, it can have a converging and guiding effect, and the particles are gradually exported.

[0048] Furthermore, in order to control the on-off of the first tail powder flowing from the first dust collector 23 into the first sending bin 24 and the on-off of the first tail powder flowing out of the first sending bin 24, the first tail powder recovery device 20 also includes a first feed valve 26 and a first discharge valve 27. The first feed valve 26 is arranged at the entrance of the first sending bin 24, and the first discharge valve 27 is arranged at the exit of the first sending bin 24. Through the setting of the first feed valve 26 and the first discharge valve 27, the entrance and exit of the first sending bin 24 can be controlled respectively, thereby controlling the entry of the first tail powder and the output from the first sending bin 24.

[0049] For example, when feeding is required, the first feed valve 26 is controlled to be opened and the first discharge valve 27 is closed; after the feeding is completed, the first feed valve 26 is closed, and the high-pressure gas conveying device 40 is opened to increase the air pressure in the first sending bin 24. After reaching a certain air pressure, the first discharge valve 27 is opened, and the powder is conveyed from the first conveying pipe 25 to the spray drying tower 10, and is dried together with the slurry sprayed by the slurry spraying device 13 to obtain the powder.

[0050] See also Figure 1 , Figure 5 as well as Figure 6In one embodiment of the present invention, the second tail powder recovery device 30 is used to be connected to an external powder conveying system to recover the tail powder generated during the conveying process of the external powder conveying system, such as the tail powder generated during the transportation of ceramic powder through a conveyor belt, or the powder generated during the distribution process of ceramic powder, or the powder generated during the process of rolling ceramic powder into block materials by a roller press. These production processes may generate tail powder. These tail powders can be collected by the second tail powder recovery device 30 and then conveyed to the spray drying tower 10 for co-atomization and drying to obtain the particle size of ceramic powder with the required moisture content.

[0051] Among them, when collecting these external tail powders, a collecting cover can be set above the production process where the tail powder is generated. The collecting cover is connected to the second tail powder recovery device 30. The negative pressure generated by the second tail powder recovery device 30 sucks the tail powder into the second tail powder recovery device 30, and then sends it to the spray drying tower 10 and slurry to be dried together to obtain ceramic powder.

[0052] Specifically, the second tail powder recovery device 30 includes a second negative pressure machine 31, a second dust collector 32, a second sending bin 33 and a second conveying pipe 34. The second dust collector 32 is used to connect to an external powder conveying system. The second negative pressure machine 31 is connected to the second dust collector 32. The second sending bin 33 is arranged at the outlet of the second dust collector 32. The second conveying pipe 34 is connected to the outlet of the second sending bin 33 and the material inlet 12. The tail powder generated by the external powder conveying process is sucked in by the second negative pressure machine 31, and the tail powder is collected through the second dust collector 32 to obtain the second tail powder. The second sending bin 33 holds the second tail powder collected in the second dust collector 32. When a certain amount is reached, it is transported to the spray drying tower 10 through the second conveying pipe 34, and is dried together with the slurry sprayed by the slurry spraying device 13 to obtain powder.

[0053] It can be understood that the second dust collector 32 is provided with a suction port 321 and a third discharge port 322. The suction port 321 is used to suck in powder. After separation in the second dust collector 32, the powder flows downward through the third discharge port 322 into the second sending bin 33 located below for collection.

[0054] The second dust collector 32 may be a bag dust collector or a cyclone dust collector or other dust removal methods, which are not limited here.

[0055] Further, in order to reduce the height of the entire second tail powder recovery device 30, the second tail powder recovery device 30 further includes a conveying mechanism 35 arranged in the horizontal direction. The conveying mechanism 35 is arranged at the outlet of the second dust collector 32 and is communicated with the inlet of the second sending bin 33. For example, a conveyor belt or a screw conveyor is arranged to convey the gradually falling powder materials into the second sending bin 33 for centralized collection. Since the conveying mechanism 35 is arranged in the horizontal direction, the height of the entire second recovery device in the vertical direction can be reduced, which is convenient for the assembly of the entire second tail powder recovery device 30. In other embodiments, the second recovery device can also adopt the method of setting an aggregate hopper 28 as in the first tail powder recovery device 20 for collection.

[0056] Further, in order to respectively control the on-off of the tail powder flowing from the second dust collector 32 into the second sending bin 33 and the on-off of the tail powder flowing out of the second sending bin 33, the second tail powder recovery device 30 further includes a second feed valve 36 and a second discharge valve 37. As Figure 6 shown, the second feed valve 36 is arranged at the inlet of the second sending bin 33, and the second discharge valve 37 is arranged at the outlet of the second sending bin 33. Through the settings of the second feed valve 36 and the second discharge valve 37, the inlet and outlet of the second sending bin 33 can be respectively controlled, so as to control the entry of the tail powder and the output from the second sending bin 33.

[0057] For example, when feeding is required, control the second feed valve 36 to open and the second discharge valve 37 to close; after feeding is completed, close the second feed valve 36, turn on the high-pressure gas conveying device 40, so that the air pressure in the second sending bin 33 increases. After reaching a certain air pressure, open the second discharge valve 37, and the powder materials are conveyed from the second conveying pipeline 34 into the spray drying tower 10 and dried together with the slurry sprayed by the slurry spraying device 13 to obtain powder materials.

[0058] Among them, please refer to Figure 6 , the second sending bin 33 is provided with a structure the same as that of the second sending bin 33, including a second arc-shaped docking section 331, a second transverse diameter section 332, and a second variable diameter section 333. The second arc-shaped docking section 331 is provided with an inlet for docking with the conveying mechanism 35, and the second variable diameter section 333 has an outlet communicated with the second conveying pipeline 34. The inner diameter of the second transverse diameter section 332 remains unchanged, so as to ensure the loading capacity of the second sending bin 33. The inner diameter of the second variable diameter section 333 gradually decreases from the direction away from the transverse diameter section, so that when the powder flows out of the second sending bin 33, it can have a converging and guiding effect and gradually guide out the powder.

[0059] Please refer to Figure 1 、 Figure 5 and Figure 6, in an embodiment of the present invention, when the high-pressure gas delivery device 40 is arranged, the high-pressure gas delivery device 40 at least includes a gas storage tank 41, a first gas supply pipeline 42 and a second gas supply pipeline 43. The first gas supply pipeline 42 is respectively connected and communicated with the gas storage tank 41 and the first tail powder recovery device 20, and the second gas supply pipeline 43 is respectively connected and communicated with the gas storage tank 41 and the second tail powder recovery device 30. Specifically, the first gas supply pipeline 42 is connected and communicated with the first sending bin 24, and the second gas supply pipeline 43 is connected and communicated with the second sending bin 33, so as to pressurize the powder in the first sending bin 24 and the second sending bin 33 respectively, so that the powder can be smoothly pressed out from the first conveying pipeline 25 and the second conveying pipeline 34 into the spray drying tower 10.

[0060] Further, in order to avoid blockage in the first conveying pipeline 25 or the second conveying pipeline 34 when the powder is pressed out from the first sending bin 24 or the second sending bin 33, the high-pressure gas delivery device 40 further includes a first fluidization pipeline 44 and a second fluidization pipeline 45; the first fluidization pipeline 44 is connected between the first gas supply pipeline 42 and the first tail powder recovery device 20, and the outlet of the first fluidization pipeline 44 is located below the outlet of the first gas supply pipeline 42; the second fluidization pipeline 45 is connected between the second gas supply pipeline 43 and the second tail powder recovery device 30, and the outlet of the second fluidization pipeline 45 is located below the outlet of the second gas supply pipeline 43. Specifically, the first fluidization pipeline 44 is connected between the second gas supply pipeline 43 and the first sending bin 24, and the second fluidization pipeline 45 is connected between the second gas supply pipeline 43 and the second sending bin 33. In this way, when the high-pressure gas is provided by the gas storage tank 41 to pressurize the powder in each sending bin, the high-pressure gas also flows into the fluidization pipeline, and the high-pressure gas makes the powder tumble and become fluffy, avoiding blockage of the corresponding conveying pipeline when flowing out from each sending bin. Further, by controlling the ratio of the high-pressure gas flowing into each sending bin from each gas supply pipeline and each fluidization pipeline respectively, the powder can be stably conveyed through the conveying pipeline, avoiding blockage.

[0061] Specifically, since the powder is more concentrated in the first reduced-diameter section 243 or the second reduced-diameter section 333, the outlet of the first gas supply pipeline 42 is located at the first arc-shaped docking section 241, and the outlet of the first fluidization pipeline 44 is located at the first reduced-diameter section 243; the outlet of the second gas supply pipeline 43 is located at the second arc-shaped docking section 331, and the outlet of the second fluidization pipeline 45 is located at the second reduced-diameter section 333, so that the first fluidization pipeline 44 and the second fluidization pipeline 45 can respectively apply air pressure to the powder to make the material tumble.

[0062] Further, in order to control the on / off of the intake air in each air supply pipeline and each fluidization pipeline, the high-pressure gas delivery device 40 includes at least two first control valves 46 and at least two second control valves 47; first control valves 46 are provided on both the first fluidization pipeline 44 and the first air supply pipeline 42, and each first control valve 46 is respectively used to control the on / off of the air supply in the first fluidization pipeline 44 and the first air supply pipeline 42, and the first control valve 46 on the first air supply pipeline 42 is provided between the interface of the first fluidization pipeline 44 and the first air supply pipeline 42 and the first tail powder recovery device 20; second control valves 47 are provided on both the second fluidization pipeline 45 and the second air supply pipeline 43, and each second control valve 47 is respectively used to control the on / off of the air supply in the second fluidization pipeline 45 and the second air supply pipeline 43, and the second control valve 47 on the second air supply pipeline 43 is provided between the interface of the second fluidization pipeline 45 and the second air supply pipeline 43 and the second tail powder recovery device 30. Thus, through the setting of the first control valve 46 and the second control valve 47, the on / off or the air supply volume ratio of the gas flowing into the first sending bin 24 and the second sending bin 33 can be controlled respectively.

[0063] For example, both the first control valve 46 and the second control valve 47 can be set as solenoid valves, which can not only control the on / off of the gas, but also control the size of the gas flow rate on their respective passages, so as to control the gas ratio, and more conveniently control the output of the powder.

[0064] Further, in order to flexibly control the on / off of the gas supply from the gas storage tank 41 to the first tail powder recovery device 10 or the second tail powder recovery device 30, the high-pressure gas delivery device 40 can include three first control valves 46 and three second control valves 47. One first control valve 46 and one second control valve 47 are respectively provided on the first fluidization pipeline 44 and the second fluidization pipeline 45. There are also two first control valves 46 provided at the front end and the rear end of the interface between the first fluidization pipeline 44 and the first air supply pipeline 42, and two second control valves 47 provided at the front end and the rear end of the interface between the second fluidization pipeline 45 and the second air supply pipeline 43. In this way, through the setting of the first control valve 46 or the second control valve 47, not only the gas ratio of each sending bin can be controlled, but also the gas can be separately controlled to be only transported into the first sending bin 24 or the second sending bin 33, which is convenient for controlling the gas flow direction.

[0065] Further, in order to ensure the safety of powder transportation, safety valves can be respectively provided in the first sending bin 24 and the second sending bin 33, which are used to respectively detect the pressure in the first sending bin 24 and the second sending bin 33, and avoid the situation of explosion due to excessive pressure. For example, when the detected pressure is too high, the valve can be automatically opened for pressure relief, so as to ensure the use safety of the whole set of equipment.

[0066] The usage process of the above-mentioned tail powder recovery system 100 is as follows: Open the first feed valve 26 and / or the second feed valve 36 respectively, and close the corresponding first discharge valve 27 and / or the second discharge valve 37. The first dust collector 23 and the second dust collector 32 collect the tail powder into the corresponding first sending bin 24 and the second sending bin 33. After the feeding is completed, close the corresponding first feed valve 26 or the second feed valve 27, and open the gas storage tank 41 to pressurize the powder in the first sending bin 24 and / or the second sending bin 33 respectively through the first gas supply pipeline 42 and / or the second gas supply pipeline 43. When the pressure in the corresponding sending bin reaches the preset value, close the first control valve 46 and the second control valve 47 on the first gas supply pipeline 42 and / or the second gas supply pipeline 43, and open the corresponding first discharge valve 27 and / or the second discharge valve 37. Gas is introduced into the first sending bin 24 and / or the second sending bin 33 through the first fluidization pipeline 44 and / or the second fluidization pipeline 45, so that the powder in the first sending bin 24 and / or the second sending bin 33 tumbles and becomes fluffy, avoiding powder blockage in the first conveying pipeline 25 or the second conveying pipeline 34. The powder conveyed through the first conveying pipeline 25 and / or the second conveying pipeline 34 enters the spray drying tower 10, combines with the slurry sprayed by the slurry spraying device 13, regranulates, and exchanges heat with the hot air flow flowing in from the air inlet 14 to obtain qualified particle products with a particle size, and finally flows out from the first discharge port 15 by its own gravity.

[0067] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A tail powder recovery system (100), characterized in that: include: A spray drying tower (10), wherein the spray drying tower (10) has a tail powder outlet (11) and a material inlet (12); A first tail powder recovery device (20) is connected to the tail powder outlet (11) and is used to recover the first tail powder generated by the spray drying tower (10), and the outlet of the first tail powder recovery device (20) is connected to the material inlet (12); A second tail powder recovery device (30) is connected to an external powder conveying system and is used to recover second tail powder generated by the powder conveying system, and an outlet of the second tail powder recovery device (30) is connected to the material inlet (12); The high-pressure gas delivery device (40) is respectively connected to the first tail powder recovery device (20) and the second tail powder recovery device (30), and is used to apply pressure to the first tail powder recovery device (20) and the second tail powder recovery device (30), so that the first tail powder and the second tail powder flow into the spray drying tower (10).

2. The tail powder recovery system (100) according to claim 1, characterized in that: The first tail powder recovery device (20) comprises a derivation pipe (21), a first negative pressure machine (22), a first dust collector (23), a first sending bin (24) and a first conveying pipeline (25); the derivation pipe (21) is connected between the tail powder outlet (11) and the first dust collector (23); the first negative pressure machine (22) and the first dust collector (23) are connected; the first sending bin (24) is arranged at the outlet of the first dust collector (23); and the first conveying pipeline (25) is connected between the outlet of the first sending bin (24) and the material inlet (12).

3. The tail powder recovery system (100) according to claim 2, characterized in that: The first tail powder recovery device (20) further comprises a first feed valve (26) and a first discharge valve (27), wherein the first feed valve (26) is arranged at the inlet of the first sending bin (24), and the first discharge valve (27) is arranged at the outlet of the first sending bin (24).

4. The tail powder recovery system (100) according to claim 2 or 3, characterized in that: The first tail powder recovery device (20) comprises a collecting hopper (28) and a plurality of the first dust collectors (23); the collecting hopper (28) is arranged at the outlets of the plurality of the first dust collectors (23) and at the inlet of the first sending bin (24).

5. The tail powder recovery system (100) according to any one of claims 1 to 3, characterized in that: The second tail powder recovery device (30) comprises a second negative pressure machine (31), a second dust collector (32), a second sending bin (33) and a second conveying pipeline (34); the second dust collector (32) is used to connect to an external powder conveying system; the second negative pressure machine (31) and the second dust collector (32) are connected; the second sending bin (33) is arranged at the outlet of the second dust collector (32); and the second conveying pipeline (34) is connected to the outlet of the second sending bin (33) and the material inlet (12).

6. The tail powder recovery system (100) according to claim 5, characterized in that: The second tail powder recovery device (30) further comprises a second feed valve (36) and a second discharge valve (37), wherein the second feed valve (36) is arranged at the inlet of the second sending bin (33), and the second discharge valve (37) is arranged at the outlet of the second sending bin (33).

7. The tail powder recovery system (100) according to claim 5, characterized in that: The second tail powder recovery device (30) further comprises a conveying mechanism (35) arranged in a horizontal direction, wherein the conveying mechanism (35) is arranged at the outlet of the second dust collector (32) and is connected to the inlet of the second sending bin (33).

8. The tail powder recovery system (100) according to any one of claims 1 to 3, characterized in that: The high-pressure gas delivery device (40) comprises at least a gas storage tank (41), a first gas supply pipeline (42) and a second gas supply pipeline (43); the first gas supply pipeline (42) is respectively connected to the gas storage tank (41) and the first tail powder recovery device (20); and the second gas supply pipeline (43) is respectively connected to the gas storage tank (41) and the second tail powder recovery device (30).

9. The tail powder recovery system (100) according to claim 8, characterized in that: The high-pressure gas delivery device (40) further comprises a first fluidizing pipeline (44) and a second fluidizing pipeline (45); The first fluidizing pipeline (44) is connected between the first air supply pipeline (42) and the first tail powder recovery device (20), and the outlet of the first fluidizing pipeline (44) is located below the outlet of the first air supply pipeline (42); The second fluidizing pipeline (45) is connected between the second air supply pipeline (43) and the second tail powder recovery device (30), and the outlet of the second fluidizing pipeline (45) is located below the outlet of the second air supply pipeline (43).

10. The tail powder recovery system (100) according to claim 9, characterized in that: The high-pressure gas delivery device (40) further comprises at least two first control valves (46) and at least two second control valves (47); The first fluidizing pipeline (44) and the first gas supply pipeline (42) are both provided with the first control valve (46), and each of the first control valves (46) is used to control the on and off of the gas supply of the first fluidizing pipeline (44) and the first gas supply pipeline (42); The second fluidizing pipeline (45) and the second air supply pipeline (43) are both provided with the second control valve (47), and each second control valve (47) is used to control the on and off of the air supply of the second fluidizing pipeline (45) and the second air supply pipeline (43).

Images