Spray drying system capable of controlling moisture

Abstract

The utility model relates to the technical field of cathode material preparation devices, in particular to a spray drying system capable of controlling moisture. The device comprises a feeding device, an air supply and dehumidification device, a receiving device and a dust removal device, according to the device, moisture is controlled at the air inlet end and the material collecting end, the moisture absorber is additionally arranged at the air inlet end to control moisture in air, and the moisture in the air is effectively removed and the initial moisture content is reduced by pretreating the air entering the drying tower; at the material collecting end, a local dehumidification measure is adopted, it is ensured that secondary moisture absorption is avoided in the powder collecting process, and the dry state of products is kept. The device can effectively control the water content in a spray drying system, reduces the dew point of spray drying equipment through effective control of the air inlet end and the material collecting end, effectively solves the problem of moisture absorption and agglomeration of materials, and improves the drying efficiency and the product quality.

Description

Technical Field

[0001] The utility model relates to the technical field of negative electrode material preparation devices, and particularly relates to a spray drying system for controlling moisture. Background Art

[0002] The working principle of a general spray drying device is to introduce the pre-prepared slurry into the atomizer through a precisely designed feeding device. Inside the atomizer, the slurry undergoes mechanical actions such as high-speed rotation or high-pressure spraying and is atomized into fine droplets in the micron range. These highly dispersed droplets then enter the drying tower and undergo sufficient and efficient heat exchange with the high-temperature hot air in the tower. During this process, the moisture in the droplets evaporates instantaneously, leaving the solid components aggregated into a powder form, thus achieving a rapid transformation from liquid to solid.

[0003] However, spray drying devices on the current market generally face a technical challenge: the low dew point causes the material to easily absorb moisture from the environment during the drying process, and then undergo hygroscopic agglomeration, which affects the final quality and dispersibility of the product. In-depth analysis reveals that the moisture sources inside the spray tower mainly include two major components: one is directly the moisture contained in the slurry itself; the other is the moisture carried by the air entering the drying tower. As these two parts of moisture flow through the spray tower body along with the air flow, due to the temperature inside the equipment gradually decreasing along the process, water vapor is prone to reach the saturation state at a lower temperature and condense into a liquid state, further exacerbating the dew point problem.

[0004] In response to this technical problem, the utility model proposes an innovative solution. Summary of the Invention

[0005] The utility model is mainly aimed at the problems of low dew point and easy hygroscopic agglomeration of materials existing in the spray drying device in the prior art, and proposes a spray drying system that can effectively control the moisture in each part of the spray drying system and avoid the material from undergoing hygroscopic agglomeration again after spray drying.

[0006] The above technical object of the utility model is achieved through the following technical solutions:

[0007] A spray drying system for controlling moisture, which at least includes a feeding device, a air supply and dehumidifying device, and a material receiving device; wherein,

[0008] The feeding device includes a stirring storage tank, a peristaltic pump, a feeding pipe, an atomizer, and a spray tower body. The atomizer is located at the top of the spray tower body, and a feeding port is provided at the top of the spray tower body, which is connected to the peristaltic pump and the stirring storage tank through the feeding pipe;

[0009] The air supply and dehumidifying device includes an air compressor, an induced draft fan, a forced draft fan, a thermocouple, a moisture absorber, and a gas guide pipe;

[0010] The material receiving device includes a cyclone material receiving tower, a drying chamber, an on-line moisture monitoring device, a monitoring display, a baffle and a baffle control switch.

[0011] Preferably, the air compressor is connected to the moisture absorber through an air inlet pipe and is connected to the atomizer at the top of the spray tower body through the air inlet pipe;

[0012] Preferably, the air blower is connected to the moisture absorber through an air inlet pipe, and the rear end of the moisture absorber is connected to a thermocouple, which are respectively connected to the air inlet of the spray tower body and the air inlet of the drying chamber;

[0013] By adopting the above technical solution, the gas pre-entering the spray tower or the drying chamber is passed through the moisture absorber to remove the moisture carried in the air, and then enters the thermocouple for heating to obtain a certain temperature and then enters the system, avoiding the entry of excess water vapor and effectively controlling the moisture in the air inlet part from the source.

[0014] Preferably, the induced draft fan is connected to the cyclone material receiving tower through an air extraction pipe;

[0015] By adopting the above technical solution, through the air extraction treatment of the induced draft fan, the gas in the entire spray drying system is made to flow, which is beneficial for the material to follow the gas flow and enter the material receiving device.

[0016] As a further preference of the above solution, air hammers are respectively provided at the bottom of the spray tower body and the bottom of the cyclone material receiving tower, and the air hammers are mechanically connected to the outer wall of the spray tower body;

[0017] As a further preference, the mechanical connection method is a hinge connection;

[0018] By adopting the above technical solution, by programming to control the interval time of the air hammer hammering, and using the air hammer to hammer the wall of the spray tower and the bottom wall of the cyclone material receiving tower, the material can fall and be collected as much as possible, reducing the situation of material sticking to the wall and avoiding material waste.

[0019] Preferably, an on-line moisture monitoring device is provided inside the bottom of the cyclone material receiving tower, and the on-line moisture monitoring device is electrically connected to an external monitoring display;

[0020] Preferably, the cyclone material receiving tower and the drying chamber are connected by a mechanical connection method;

[0021] As a further preference, the mechanical connection method includes but is not limited to welding connection, threaded connection, key connection, etc.;

[0022] Preferably, a baffle and a baffle control switch are provided at the connection between the bottom of the cyclone material receiving tower and the top of the drying chamber, and the baffle control switch is electrically connected between the monitoring display and the baffle;

[0023] As a further preference, the opening and closing manner of the baffle includes, but is not limited to, a push-pull type or a flip type;

[0024] As a further preference, the baffle has a smooth surface, specifically it can be mirror stainless steel or conventional stainless steel material coated with a non-stick coating;

[0025] As a further preference, the shape of the baffle is consistent with the shape of the upper opening of the drying chamber to ensure that a closed space is formed in the drying chamber when the baffle is closed;

[0026] By adopting the above technical solution, a moisture on-line monitoring device is provided inside the bottom of the cyclone material collector tower and the moisture content value is displayed through a display. When the moisture content of the material reaches the set limit of the moisture on-line monitoring device, the baffle control switch receives an instruction and the bottom baffle of the cyclone material collector tower automatically opens, and the material falls into the drying chamber, and the recycled hot air sent into the drying chamber by the air blower is used for drying treatment again; through stage-by-stage moisture content control, the material enters the drying chamber for drying in multiple times and in small amounts, which is beneficial to better remove the moisture in the material and avoid moisture absorption and agglomeration of the material; the baffle is made of mirror stainless steel or stainless steel plate coated with non-stick material, which can minimize the adhesion of the material to the wall and reduce material waste.

[0027] As a preference, the aggregate tank is connected to the discharge port of the drying chamber through a conveying pipe;

[0028] By adopting the above technical solution, while further reducing the moisture content by using the recycled hot air sent into the drying chamber by the air blower, the dry material is transported to the aggregate tank for collection, realizing the separation of dry and wet materials.

[0029] As a preference, the spray drying system for controlling moisture further includes a dust removal device, and the dust removal device includes a bag filter and a tail gas collector;

[0030] As a preference, the air outlet of the aggregate tank is connected to dust removal devices such as a dust removal bag and a tail gas collector through a guide pipe;

[0031] As a further preference, the tail gas after dust removal is led to the air inlet of the spray tower through a guide pipe, and after being further subjected to moisture absorption and heating treatment, it enters the spray tower body;

[0032] As a further preference of the above solution, the collection device further includes a dust remover, and the tail end of the tail gas collector is connected to the dust remover through a guide pipe to further remove the impurities carried in the gas and avoid the pollution of the material caused by the impurities during the secondary utilization of the tail gas;

[0033] As a preference, the tail end of the dust remover is connected to the air supply and dehumidification device through a guide pipe, and more preferably connected to the air blower at the air inlet of the spray tower;

[0034] By adopting the above technical solution, after the tail gas is treated by dust removal, filtration, etc., it enters the air supply and dehumidification device again, and after secondary treatment, it enters the system for recycling, improving the utilization rate of the tail gas.

[0035] Preferably, temperature displays (not shown in the figure) are provided at the inlet and outlet gas pipes of the spray tower body and the drying chamber to observe the temperature change of the high-temperature gas in real time, adjust the heating power of the thermocouple, and keep the temperature in the system relatively stable.

[0036] The feed pipe and the inlet pipe used in the present utility model are both high-temperature resistant flexible hoses; other pipes are all stainless steel pipes, and the connection method is stainless steel flange connection;

[0037] The metal structural parts used, unless otherwise specified, are made of 304 stainless steel, with high strength, corrosion resistance, and easy welding and processing.

[0038] In summary, the purpose of the present utility model is to design a spray drying device that can control the moisture to reduce the dew point. The spray system is divided into a feeding device, an air supply and dehumidification device, a material collection device, and a dust removal device. By installing a moisture absorber at the air inlet end, the moisture in the air entering the system is effectively reduced, reducing the entry of water vapor from the source and reducing the water content in the system; and a moisture on-line monitoring device and a baffle and other structures are provided in the material collection device. By monitoring the water content in the cyclone collector for material collection on-line, when the moisture exceeds the upper limit of moisture monitoring, the on-line monitoring device automatically sends a command to the baffle control switch to open the baffle so that the material falls into the drying chamber for drying, further removing the moisture in the material, avoiding the agglomeration of the material due to moisture absorption, effectively ensuring a high yield, and greatly improving the production efficiency; tail gas purification and other equipment are provided at the tail gas end of the system. After dust removal, the tail gas enters the spray tower or the drying chamber again after passing through the moisture absorber, realizing the reuse of the tail gas heat, reducing heat loss, improving the utilization rate of energy, and also ensuring the stability of the heat source.

[0039] Therefore, the present utility model has the following beneficial effects:

[0040] 1. By adding a moisture absorber at the air inlet end to control the moisture in the air, and adding a moisture on-line monitoring device and a baffle and other structures at the aggregate end to cooperate to control the moisture in the spray drying device, local dehumidification measures are adopted to ensure that secondary moisture absorption is avoided during the powder collection process and the dry state of the product is maintained;

[0041] 2. By providing tail gas purification and other equipment at the tail gas end of the system, after dust removal, the tail gas enters the spray tower or the drying chamber again after passing through the moisture absorber, realizing the reuse of the tail gas heat, reducing heat loss, improving the utilization rate of energy, and also ensuring the stability of the heat source;

[0042] 3. The present utility model has a simple structure, convenient operation, and a wide range of applications. Description of the Drawings

[0043] Figure 1 It is a schematic diagram of the overall structure of a spray drying system for controlling moisture according to an embodiment of the present utility model;

[0044] Figure 2 It is a schematic diagram of the overall structure of a spray drying system for controlling moisture with a dust removal device according to an embodiment of the present utility model;

[0045] Figure 3 It is a schematic diagram of the overall structure of a spray drying system for controlling moisture with a pneumatic hammer structure according to an embodiment of the present utility model;

[0046] Figure 4 It is a schematic diagram of the feeding device of a spray drying system for controlling moisture according to an embodiment of the present utility model;

[0047] Figure 5 It is a schematic diagram of the air supply and dehumidification device of a spray drying system for controlling moisture according to an embodiment of the present utility model;

[0048] Figure 6 It is a schematic diagram of the material receiving device of a spray drying system for controlling moisture according to an embodiment of the present utility model;

[0049] Figure 7 It is a schematic diagram of the dust removal device of a spray drying system for controlling moisture according to an embodiment of the present utility model;

[0050] Figure 8 It is a schematic diagram of the feeding device with a pneumatic hammer structure according to an embodiment of the present utility model;

[0051] Figure 9 It is a schematic diagram of the material receiving device with a pneumatic hammer structure according to an embodiment of the present utility model.

[0052] In the figure:

[0053] 1. Feeding device; 11. Stirring liquid storage tank; 12. Peristaltic pump; 13. Feeding pipe; 14. Atomizer; 15. Spray tower body; 16. Spray tower pneumatic hammer;

[0054] 2. Air supply and dehumidification device; 21. Air compressor moisture absorber; 22. Air compressor; 23. Thermocouple at the air inlet of the spray tower; 24. Moisture absorber at the air inlet of the spray tower; 25. Air supply fan at the air inlet of the spray tower; 26. Induced draft fan; 27. Thermocouple at the air inlet of the drying chamber; 28. Moisture absorber at the air inlet of the drying chamber; 29. Air supply fan at the air inlet of the drying chamber;

[0055] 3. Material receiving device; 31. Cyclone material receiving tower; 32. Baffle; 33. Drying chamber; 34. Aggregate tank; 35. Baffle control switch; 36. Monitoring display; 37. On-line moisture monitoring device; 38. Material receiving tower pneumatic hammer;

[0056] 4. Dust removal device; 41. Bag filter; 42. Tail gas collector; 43. Dust remover. Specific embodiments

[0057] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0058] As Figure 1 , 4 -6 shows, in an embodiment of the present utility model, a spray drying device for controlling moisture, including a feeding device 1, a air supply and dehumidifying device 2, and a material collecting device 3. Among them, the atomizer 14 in the feeding device 1 is arranged at the inner top end of the spray tower body 15, and is externally connected to a peristaltic pump 12 and a stirring storage tank 11 through a feeding pipe 13, and is externally connected to an air compressor moisture absorber 21 and an air compressor 22 in the air supply and dehumidifying device 2. The bottom of the spray tower body 15 is connected to the feeding port of the material collecting device 3 through a guide pipe, and the side wall is sequentially connected to a spray tower inlet thermocouple 23, a spray tower inlet moisture absorber 24, and a spray tower inlet air blower 25 in the air supply and dehumidifying device 2 through a guide pipe. In the material collecting device 3, the drying chamber 33 is mechanically connected to the cyclone collecting tower 31 and is connected to the aggregate tank 34 through a guide pipe; the side wall of the cyclone collecting tower 31 is externally connected to an induced draft fan 26 in the air supply and dehumidifying device 2 through a guide pipe, and the upper part of the side wall of the drying chamber 33 is externally connected to a drying chamber inlet thermocouple 27, a drying chamber inlet moisture absorber 28, and a drying chamber inlet air blower 29 in the air supply and dehumidifying device 2 through a guide pipe; a baffle 32 is arranged at the connection between the cyclone collecting tower 31 and the drying chamber 33 and is electrically connected to a baffle control switch 35; a moisture on-line monitoring device 37 is arranged inside the bottom of the cyclone collecting tower 31 and is electrically connected to an external monitoring display 36.

[0059] In an embodiment of the present utility model, the induced draft fan 26 is turned on to make the air inside the device flow, and the spray tower inlet air blower 25, the spray tower inlet moisture absorber 24, and the spray tower inlet thermocouple 23 are turned on. The spray tower inlet moisture absorber 24 removes moisture, and then the heated and dried gas is heated through the spray tower inlet thermocouple 23; the high-temperature gas enters the spray tower body 15 through the inlet, and the high-temperature gas forms a downward swirling airflow after hitting the inner wall of the tower due to its high flow rate, providing an initial temperature for the spray drying tower.

[0060] When the temperature is appropriate, the air compressor 22, the air compressor moisture absorber 21, and the peristaltic pump 12 are turned on for feeding and spraying. The material to be spray-dried is placed in the stirring storage tank 11, and the material enters the atomizer 14 through the peristaltic pump 12 via the feeding hose. The pressure provided by the air compressor 22 can atomize the liquid to achieve the spraying effect.

[0061] After the material is atomized and sprayed out in the spray tower body 15, it gradually falls to the discharge port and enters the cyclone collecting tower 31 under the drive of a certain high-temperature gas. At this time, the baffle 32 remains closed. The moisture content in the cyclone collecting tower 31 is monitored in real time by the on-line moisture monitoring device 37 provided in the cyclone collecting tower 31, and the monitoring result is fed back to the monitoring display 36. When the moisture exceeds the limit set by the on-line moisture monitoring device 37, the on-line moisture monitoring device 37 sends a command to the baffle control switch 35 to open the baffle 32, and the material with a higher moisture content falls into the drying chamber 33. The air is sent into the drying chamber inlet air humidifier 28 and the drying chamber inlet air thermocouple 27 through the drying chamber inlet air blower 29 to obtain dry hot air. The material with a higher moisture content is dried by the dry hot air in the drying chamber 33 for drying treatment. When the moisture content in the cyclone collecting tower 31 monitored by the on-line moisture monitoring device 37 is lower than the limit value, the baffle 32 is closed, and the dried material is transferred to the aggregate tank 34 under the action of the hot drying air flow for material collection.

[0062] In another embodiment of the present invention, as Figure 2 , 7 shown, the spray drying equipment for controlling moisture further includes a dust removal device 4, that is, the air outlet of the aggregate tank 34 of the material collection device 3 is connected to the bag filter 41, the tail gas collector 42, and the dust collector 43 in the dust removal device 4 in sequence through a conduit; the tail end of the dust collector 43 is connected to the spray tower inlet air blower 25 of the air supply and dehumidification device 2 through a conduit.

[0063] After the material is collected in the aggregate tank 34, the excess gas is discharged from the aggregate tank 34. The aggregate tank 34 of the material collection device 3, the dust removal device 4, the air supply and dehumidification device 2, and the spray tower body 15 in the feeding device 1 are connected in sequence through a conduit. The tail gas discharged from the aggregate tank 34 enters the bag filter 41 through a conduit for dust removal treatment, and then enters the tail gas collector 42 for temporary storage, which is the recycled gas for subsequent recycling; the recycled gas with a certain temperature temporarily stored in the tail gas collector 42 passes through the dust collector 43 again and is then introduced into the spray tower inlet air blower 25 through a conduit. After moisture absorption treatment, it enters the system for recycling, realizing the repeated utilization of the heat of the tail gas and reducing heat loss; when necessary, the tail gas can be reheated twice to ensure the heating effect.

[0064] In another embodiment of the present invention, as Figure 3 , 8 -9 shown, a spray tower air hammer 16 is provided at the bottom of the spray tower body 15, and the spray tower air hammer 16 is mechanically connected to the outer wall of the spray tower body 15; a collecting tower air hammer 38 is mechanically connected to the outside of the bottom of the cyclone collecting tower 31.

[0065] An air hammer 16 for the spray tower and an air hammer 38 for the material collection tower controlled by a program are arranged outside the spray tower body 15 and the cyclone material collection tower 31. For the wall-sticking materials with relatively high water content, the two air hammers are set and started through the control program. By using the hammering of the air hammers, the wall-sticking materials are made to fall together and flow downstream with the high-temperature gas to the next process, reducing the wall sticking of the materials and avoiding the waste of materials.

[0066] In summary, for a spray drying device for controlling moisture according to the present utility model, on the basis of a conventional spray drying tower body, the spray system is divided into a feeding device, a air supply and dehumidifying device, and a material collection device. By installing a moisture absorber at the air inlet end, the moisture in the air entering the system is effectively reduced, reducing the entry of water vapor from the source and lowering the water content in the system. And a moisture on-line monitoring device and a baffle and other structures are arranged in the material collection device. By on-line monitoring the water content in the cyclone material collection tower, when the moisture exceeds the upper limit of moisture monitoring, the on-line monitoring device automatically sends an instruction to the baffle control switch to open the baffle so that the material falls into the drying chamber for drying, further removing the moisture in the material, avoiding the agglomeration of the material due to moisture absorption, effectively ensuring a high yield, and greatly improving the production efficiency. In other embodiments of the present utility model, by setting equipment such as tail gas purification at the tail gas end of the system, the tail gas after dust removal enters the spray tower again after passing through the moisture absorber, realizing the reuse of the tail gas heat and reducing the heat loss.

[0067] This specific embodiment is only an explanation of the present utility model and does not limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present utility model, they are protected by the patent law.

Claims

1. A spray drying system for controlling moisture, characterized in that, It includes at least a feeding device (1), a air supply and dehumidifying device (2), and a material receiving device (3). Among them, the feeding device (1) is connected to the air supply and dehumidifying device (2) through a gas pipe, and is connected to the material receiving device (3) through a material pipe; the air supply and dehumidifying device (2) is connected to the material receiving device (3) through a gas pipe.

2. The spray drying system for controlling moisture according to claim 1, characterized in that, The feeding device (1) includes a stirring storage tank (11), a peristaltic pump (12), a feeding pipe (13), an atomizer (14), and a spray tower body (15). Among them, the atomizer (14) in the feeding device (1) is arranged inside the spray tower body (15), and is connected to the peristaltic pump (12) and the stirring storage tank (11) in sequence through the feeding pipe (13).

3. The spray drying system for controlling moisture according to claim 2, characterized in that, A spray tower air hammer (16) is provided at the bottom of the spray tower body (15), and the spray tower air hammer (16) is mechanically connected to the outer wall of the spray tower body (15).

4. A spray drying system for controlling moisture according to claim 1, wherein, The air supply and dehumidifying device (2) includes an air compressor moisture absorber (21) and an air compressor (22), and the air compressor (22) and the air compressor moisture absorber (21) are connected to the atomizer (14) through a gas pipe in sequence; and / or, the air supply and dehumidifying device (2) includes a spray tower inlet thermocouple (23), a spray tower inlet moisture absorber (24), and a spray tower inlet air blower (25), and the spray tower inlet air blower (25), the spray tower inlet moisture absorber (24), and the spray tower inlet thermocouple (23) are connected to the spray tower body (15) through a gas pipe in sequence; and / or, the air supply and dehumidifying device (2) includes an induced draft fan (26), which is connected to the material receiving device (3) through a gas pipe; and / or, the air supply and dehumidifying device (2) includes a drying chamber inlet thermocouple (27), a drying chamber inlet moisture absorber (28), and a drying chamber inlet air blower (29), and the drying chamber inlet air blower (29), the drying chamber inlet moisture absorber (28), and the drying chamber inlet thermocouple (27) are connected to the material receiving device (3) through a gas pipe in sequence.

5. A spray drying system for controlling moisture according to any one of claims 1-4, characterized in that, The material receiving device (3) includes a cyclone dust collector tower (31), a drying chamber (33), and an aggregate tank (34); the drying chamber (33) is mechanically connected to the cyclone dust collector tower (31) and is connected to the aggregate tank (34) through a material pipe.

6. The spray drying system for controlling moisture according to claim 5, wherein, A baffle (32) is provided at the connection between the cyclone dust collector tower (31) and the drying chamber (33), and is electrically connected to a baffle control switch (35), a monitoring display (36), and an on-line moisture monitoring device (37), and is controlled by the numerical change of the monitoring display (36).

7. The spray drying system for controlling moisture according to claim 5, characterized in that, A dust collector tower air hammer (38) is mechanically connected to the outside of the bottom of the cyclone dust collector tower (31).

8. A spray drying system for controlling moisture according to claim 1, characterized in that, The spray drying system further includes a dust removal device (4), which is connected to the material receiving device (3) through a gas pipe.

9. A spray drying system for controlling moisture according to claim 8, characterized in that, The dust removal device (4) includes a bag filter (41) and a tail gas collector (42), and the bag filter (41) is connected to the tail gas collector (42) through a gas pipe.

10. A spray drying system for controlling moisture according to claim 9, characterized in that, The dust removal device (4) further includes a dust collector (43), which is connected to the tail end of the tail gas collector (42) through a gas guide pipe; the tail end of the dust collector (43) is connected to the air supply and dehumidification device (2) through a gas guide pipe.

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