Spray drying equipment

Abstract

The utility model discloses spray drying equipment which comprises a hearth body, an air inlet pipe, a liquid inlet pipe, a plurality of atomizing nozzles and a plurality of air outlet pipes, the atomizing nozzles are arranged at the top of the hearth body and are communicated with the air inlet pipe and the liquid inlet pipe, and the air outlet pipes are communicated with the air inlet pipe and the liquid inlet pipe. The multiple air outlet pipes are annularly arranged on the inner side wall of the hearth body and communicate with the air inlet pipe, all the air outlet pipes are arranged in the first direction, and at least one linear air outlet facing the central axis of the hearth body is formed in the side, facing the central axis of the hearth body, of each air outlet pipe. According to the gas outlet pipe for the high-temperature hearth, the duration of mist dropping to the bottom of the hearth body is delayed, the drying / pyrolysis time of atomized liquid drops in the high-temperature hearth can be effectively prolonged, and waste of resources is reduced.

Description

Technical Field

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

[0002] As a new technology, spray pyrolysis has been used as a traditional technology to study powder materials since the last century. In recent years, with the development of the new energy materials market, it has gradually been applied to the preparation of ternary materials. Its advantage is that metal salts or their mixed solutions can be directly used to synthesize precursors and positive electrode materials. Therefore, it has the advantages of short process, low cost, no pollution source emissions, controllable product particle size, good uniformity and adaptable doping.

[0003] The current process equipment for preparing positive electrode materials or precursors by spray pyrolysis has a relatively simple furnace structure, and the furnace is usually only equipped with an atomizing nozzle for atomization. However, after the matrix solution is atomized by the atomizing nozzle, its atomized droplets will quickly fall to the bottom of the furnace, resulting in a shorter residence time of the atomized droplets of the matrix solution in the furnace. The shorter residence time will result in a shorter drying time of the atomized droplets, which will in turn lead to a low utilization rate of the droplets in the entire furnace, resulting in a waste of resources. Utility Model Content

[0004] The utility model discloses a spray drying device, which is used for improving the overall use efficiency of a furnace.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] The utility model provides a spray drying device, comprising: a furnace body, an air inlet pipe, a liquid inlet pipe, an atomizing nozzle and a plurality of air outlet pipes;

[0007] There are multiple atomizing nozzles, and the multiple atomizing nozzles are all arranged on the top of the furnace body and are connected to the air inlet pipe and the liquid inlet pipe. The multiple air outlet pipes are annularly arranged on the inner side wall of the furnace body and are connected to the air inlet pipe.

[0008] Each of the air outlet pipes is arranged along a first direction, which is the direction from the top of the furnace body to the bottom, and each of the air outlet pipes is toward the side of the central axis of the furnace body, and is provided with at least one linear air outlet toward the central axis of the furnace body, and the air outlet end of the linear air outlet forms a certain angle θ with respect to the axis of the air outlet pipe body, and the angle θ can change with the opening direction of the linear air outlet.

[0009] The present application arranges a plurality of air outlet pipes in a ring shape on the inner wall of the furnace body, and arranges the plurality of air outlet pipes up and down along the axial direction of the furnace body, and opens a linear air outlet on the air outlet pipe, and the angle of the linear air outlet can be changed according to actual use. On this basis, the cooperation between the plurality of linear air outlets can form an annular turbulent air flow field inside the furnace body. These air flows will interfere with the droplets generated by the atomizing nozzle during the falling process, causing the droplets to move irregularly inside the furnace body, thereby delaying the time for the droplets to fall to the bottom of the furnace body. The excessive residence time can effectively increase the drying / pyrolysis time of the atomized droplets inside the high-temperature furnace, thereby increasing the drying / pyrolysis utilization rate of the droplets and reducing the waste of resources.

[0010] In some embodiments, an angle θ formed by the outlet end of the linear outlet relative to the axis of the outlet pipe body satisfies the following range: 0°≤θ≤90°.

[0011] In some embodiments, the angle θ of the linear air outlet opened on one of the air outlet pipes is a first angle, and the angle θ of the linear air outlet opened on the other air outlet pipe is a second angle, and the first angle is different from the second angle.

[0012] In some embodiments, the plurality of atomizing nozzles are distributed in a circular ring structure along a second direction on the top of the furnace body, and there are multiple circular ring structures formed by the plurality of atomizing nozzles, and the plurality of circular ring structures are arranged at intervals, and the second direction is the direction from the center of the furnace body to the edge.

[0013] In some embodiments, the radius of the furnace body is r, and the number of the atomizing nozzles is x, wherein the relationship between x and r satisfies: 1+4(r-1)≤x≤1+10(r-1).

[0014] In some embodiments, the air intake pipe includes an air intake main pipe, multiple air intake branch pipes and a second regulating component, one end of each of the multiple air intake branch pipes is connected to the air intake main pipe, and the other end is respectively connected to the air outlet pipe and the atomizing nozzle, wherein each of the air outlet pipes is provided with an air intake branch pipe in a one-to-one correspondence, and the second regulating component is arranged inside the air intake branch pipe, and any one of the second regulating components corresponds one-to-one to any one of the air intake branch pipes, and the second regulating component includes a gas flow meter and a speed control valve, and is used to regulate the air pressure and frequency of the conveying gas inside any of the air outlet pipes.

[0015] In some embodiments, the gas pressure P of the gas transported inside the gas outlet pipe satisfies the following relationship: 1≤P≤10 bar.

[0016] In some embodiments, the frequency of delivering gas inside the gas outlet pipe is 10-120 times / min.

[0017] In some embodiments, the liquid inlet pipe includes a liquid inlet main pipe, multiple liquid inlet branch pipes and a first regulating component, wherein one end of each of the multiple liquid inlet branch pipes is connected to the liquid inlet main pipe, and the other end is respectively connected to the atomizing nozzle, the first regulating component is arranged inside the liquid inlet branch pipe, and any one of the first regulating components corresponds one-to-one to any one of the liquid inlet branch pipes, and the first regulating component includes a liquid flow meter and a controllable flow rate valve.

[0018] In some embodiments, the cross-section of the air outlet pipe is circular or rectangular. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall structure of a spray drying device provided by the utility model;

[0020] Figure 2 A schematic diagram of the structure of the furnace body of a spray drying device provided by the utility model;

[0021] Figure 3 A schematic diagram of the structure of the air outlet pipe of a spray drying device provided by the utility model;

[0022] Figure 4 A partial structural top view of a spray drying device provided by the utility model;

[0023] Figure 5 The utility model provides a schematic diagram of the movement of droplets in a furnace body of a spray drying device.

[0024] Among them: 1-furnace body, 2-air outlet pipe, 21-linear air outlet, 3-atomizing nozzle, 4-liquid inlet main pipe, 41-first regulating component, 42-liquid inlet branch pipe, 5-air inlet main pipe, 51-second regulating component, 52-air inlet branch pipe. DETAILED DESCRIPTION

[0025] The following will combine the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0026] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0027] like Figure 1-Figure 2 As shown, the embodiment of the utility model provides a spray drying device, including: a furnace body 1, an air inlet pipe, a liquid inlet pipe, an atomizing nozzle 3 and a plurality of air outlet pipes 2;

[0028] There are multiple atomizing nozzles 3, and the multiple atomizing nozzles 3 are all arranged on the top of the furnace body 1 and connected with the air inlet pipe and the liquid inlet pipe. Multiple air outlet pipes 2 are annularly arranged on the inner side wall of the furnace body 1 and connected with the air inlet pipe.

[0029] Each of the air outlet pipes 2 is arranged along a first direction, the first direction is the direction from the top to the bottom of the furnace body 1, and each of the air outlet pipes 2 is toward the side of the central axis of the furnace body 1, and is provided with at least one linear air outlet 21 toward the central axis of the furnace body 1, and the air outlet end of the linear air outlet 21 forms a certain angle θ with respect to the axis of the air outlet pipe 2 body, and the angle θ can change with the opening direction of the linear air outlet.

[0030] The present application arranges a plurality of air outlet pipes 2 in a ring shape on the inner wall of the furnace body 1, and arranges the plurality of air outlet pipes 2 up and down along the axial direction of the furnace body 1, and opens a linear air outlet 21 on the air outlet pipe 2, and the angle of the linear air outlet 21 can be changed according to actual use. On this basis, the cooperation between the plurality of linear air outlets 21 can form an annular turbulent airflow field inside the furnace body 1, and these airflows will interfere with the droplets generated by the atomizing nozzle 3 during the falling process, so that the droplets will move irregularly inside the furnace body 1, thereby delaying the time for the droplets to fall to the bottom of the furnace body 1, and the excessive residence time can effectively increase the drying / pyrolysis time of the atomized droplets inside the high-temperature furnace, so that the drying / pyrolysis utilization rate of the droplets is higher, and the waste of resources is reduced.

[0031] For a possible implementation, see Figure 3 The angle θ formed by the outlet end of the linear air outlet 21 relative to the axis of the outlet pipe 2 body satisfies the following range: 0°≤θ≤90°. In the above structure, the present application sets the angle formed by the outlet end of the linear air outlet 21 relative to the axis of the outlet pipe 2 body to a variable angle, so that the outlet pipe 2 in the present application can adapt to different working conditions and can change different angles according to actual needs, thereby meeting the practicality of the present application.

[0032] In one possible implementation method, the angle θ of the linear air outlet 21 opened on one air outlet pipe 2 is a first angle, and the angle θ of the linear air outlet 21 opened on the other air outlet pipe 2 is a second angle. The first angle is different from the second angle. The angle of the linear air outlet 21 opened on each air outlet pipe 2 of the present application can be changed according to actual needs, and the present application does not make any specific limitation on this.

[0033] For a possible implementation, see Figure 4 , Figure 5 , multiple atomizing nozzles 3 are distributed in a circular ring structure along the second direction on the top of the furnace body 1, and there are multiple circular ring structures formed by the multiple atomizing nozzles 3, and the multiple circular ring structures are arranged at intervals. The second direction is the direction from the center of the furnace body 1 to the edge. The present application sets a plurality of atomizing nozzles 3, so that the efficiency of the single furnace body 1 can be effectively improved while the initial feed flow rate and the initial air pressure remain unchanged, thereby indirectly reducing the equipment investment cost. On the basis of this, the present application also improves the utilization efficiency of the furnace body 1.

[0034] In one possible implementation method, the radius of the furnace body 1 is r, and the number of the atomizing nozzles 3 is x, wherein the relationship between x and r satisfies: 1+4(r-1)≤x≤1+10(r-1). In the above structure, in order to ensure the dispersion range of the atomizing nozzles 3, the present application requires more atomizing nozzles 3, but if there are too many atomizing nozzles 3, the droplets sprayed by the atomizing nozzles 3 will overlap and re-melt, thereby affecting the atomization effect. Therefore, the atomizing nozzles 3 in the present application need to limit the number of the atomizing nozzles 3 according to the radius of the furnace body 1, so as to meet the dispersion range of the atomizing nozzles 3 while reducing the overlap of droplets. It is worth noting that when the number of atomizing nozzles 33 in the present application satisfies 1+4(r-1)≤x≤1+6(r-1), the atomization effect of the atomizing nozzles 3 is better.

[0035] For a possible implementation, see Figure 1 The air intake pipe includes an air intake main pipe 5, multiple air intake branch pipes 52 and a second regulating component 51. One end of the multiple air intake branch pipes 52 are connected to the air intake main pipe 5, and the other end is respectively connected to the air outlet pipe 2 and the atomizing nozzle 3, wherein each air outlet pipe 2 is provided with an air intake branch pipe 52 in a one-to-one correspondence, and the second regulating component 51 is arranged inside the air intake branch pipe 52, and any second regulating component 51 corresponds to any air intake branch pipe 52 in a one-to-one correspondence, and the second regulating component 51 includes a gas flow meter and a speed control valve, and is used to regulate the air pressure and frequency of the conveying gas inside any air outlet pipe 2, wherein a part of the air intake branch pipe 52 is used for connecting to the air outlet pipe 2 to ensure that the air outlet pipe 2 can better blow out the airflow, and the other part is used to connect to the atomizing nozzle 3 to provide the necessary air pressure for the atomizing nozzle 3. At the same time, the present application can effectively control the flow rate of the gas inside each air intake branch pipe 52 through the second regulating component 51, so that the present application can meet different working conditions.

[0036] In one possible implementation method, the air pressure P of the gas transported inside the outlet pipe 2 satisfies the following relationship: 1≤P≤10bar. First, the present application sets the air pressure of the gas transported inside the outlet pipe 2 to a variable range, so that when the present application is actually used, the staff can continuously change the air pressure of the gas in the outlet pipe 2, and then find specific parameters suitable for furnace bodies 1 of different sizes.

[0037] In one possible implementation method, the frequency of gas transportation inside the outlet pipe 2 is 10-120 times / min. In the above design of the present application, the frequency of gas transportation inside the outlet pipe 2 is set to a variable range, so that when the present application is actually used, the staff can continuously change the frequency of the gas in the outlet pipe 2, and then find specific parameters suitable for furnace bodies 1 of different sizes.

[0038] In one possible implementation, the liquid inlet pipe includes a liquid inlet main pipe 4, multiple liquid inlet branch pipes 42 and a first regulating component 41, wherein one end of the multiple liquid inlet branch pipes 42 are connected to the liquid inlet main pipe 4, and the other end is respectively connected to the atomizing nozzle 3, the first regulating component 41 is arranged inside the liquid inlet branch pipe 42, and any first regulating component 41 corresponds one-to-one to any liquid inlet branch pipe 42, and the first regulating component 41 includes a liquid flow meter and a controllable flow rate valve, also to enable the present application to meet different working conditions.

[0039] In one possible implementation, the cross-section of the gas outlet pipe 2 is circular or rectangular, and the present application does not make any specific limitation on this. As long as the gas outlet pipe 2 in the present application can blow gas to the furnace body 1 normally, it can be ensured that the droplets can be fully dispersed by the gas blown out by the gas outlet pipe 2, effectively prolonging the falling time of the droplets inside the furnace body 1 and improving the pyrolysis efficiency.

[0040] In one possible implementation, when the device in the present application is used, the specific method steps may be: using a solution containing nickel, cobalt and manganese salts as a matrix solution; the matrix solution is sprayed and pyrolyzed using the above-mentioned spray drying equipment, wherein the material is separated and collected, the acidic gas is recovered, and the material is dried, crushed, and sieved to finally obtain nickel, cobalt and manganese metal oxides; the nickel, cobalt and manganese metal oxides are sintered to obtain positive electrode materials.

[0041] The sintering process includes single-stage sintering, the sintering temperature of the single-stage sintering is 600°C-800°C, and the sintering time is 3h-10h. Or,

[0042] The sintering process includes multi-stage sintering, in which the temperature of the insulation stage is 400°C-600°C and the sintering temperature is 700°C-800°C.

[0043] 1. First, two comparative examples are carried out using the existing conventional atomization scheme;

[0044] Comparative Example 1:

[0045] First, a pyrolysis furnace with a height of 3 m and a diameter of 1.2 m is selected as the experimental furnace body 1 , and six independent two-fluid atomizing nozzles 3 are arranged above the furnace body 1 .

[0046] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0047] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 950°C.

[0048] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0049] Comparative Example 2:

[0050] First, a pyrolysis furnace with a height of 10 m and a diameter of 3 m is selected as the experimental furnace body 1 , and 6 independent two-fluid atomizing nozzles 3 are arranged above the furnace body 1 .

[0051] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0052] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 800°C.

[0053] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0054] 2. Below, this application will describe the specific embodiments of this application in combination with specific data;

[0055] Embodiment 1:

[0056] First, a pyrolysis furnace with a height of 3m and a diameter of 1.2m is selected as the experimental furnace body 1. There are four outlet pipes 2, and four corresponding air inlet branch pipes 52. The air inlet mode of the outlet pipes 2 is continuous air inlet. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0057] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0058] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 800°C.

[0059] The process maintains the suspension airflow angle θ at 0°, generates a horizontal convection turbulent flow field, and continuously provides a turbulent airflow field by continuous air intake.

[0060] Embodiment 2:

[0061] First, a pyrolysis furnace with a height of 3m and a diameter of 1m is selected as the experimental furnace body 1. There are four outlet pipes 2, and there are four corresponding air inlet branch pipes 52. The air outlet pipes 2 intake air at intervals with a certain frequency. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0062] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0063] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 800°C.

[0064] The process maintains the suspension airflow angle θ at 0° to generate a turbulent flow field of advection, and four air outlet pipes 2 are provided to provide a turbulent airflow field at an airflow frequency of 60 times / min.

[0065] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0066] Embodiment three:

[0067] First, a pyrolysis furnace with a height of 2.5m and a diameter of 0.8m is selected as the experimental furnace body 1. There are four outlet pipes 2, and there are four corresponding air inlet branch pipes 52. The air inlet mode of the outlet pipe 2 is continuous air inlet. There are four independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0068] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0069] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 150 ml / min, the carrier gas flow rate is 150 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 800°C.

[0070] The process maintains the suspension airflow angle θ at 45°, and simultaneously sets four air outlet pipes 2 as continuous air intake airflow to provide a turbulent airflow field.

[0071] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0072] Embodiment 4:

[0073] First, a pyrolysis furnace with a height of 2.5m and a diameter of 0.8m is selected as the experimental furnace body 1. There are four outlet pipes 2, and there are four corresponding air inlet branch pipes 52. The air outlet pipes 2 have an air intake mode of interval intake at a certain frequency. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0074] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0075] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 750°C.

[0076] The process maintains the suspension airflow angle θ at 60° to generate an upward convective turbulent flow field, and four air outlet pipes 2 are provided to provide a turbulent airflow field at an airflow frequency of 100 times / min.

[0077] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0078] Embodiment five:

[0079] First, a pyrolysis furnace with a height of 3m and a diameter of 1.8m is selected as the experimental furnace body 1. The number of the outlet pipes 2 is 5, and the corresponding number of the inlet branch pipes 52 is 5. The air intake mode of the outlet pipes 2 is continuous air intake. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0080] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0081] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 800°C.

[0082] The process maintains the suspension airflow angle θ at 0°, and at the same time, five air outlet pipes 2 are set as continuous air intake airflows to provide an inclined upward turbulent airflow field.

[0083] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0084] Embodiment six:

[0085] First, a pyrolysis furnace with a height of 3m and a diameter of 1.2m is selected as the experimental furnace body 1. The number of the outlet pipes 2 is 5, and the corresponding number of the inlet branch pipes 52 is 5. The air intake mode of the outlet pipes 2 is continuous air intake. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0086] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0087] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 800°C.

[0088] The process maintains the suspension airflow angle θ at 50° to generate an upward convective turbulent flow field, and at the same time, five air outlet pipes 2 are provided to provide a turbulent airflow field at an airflow frequency of 120 times / min.

[0089] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0090] Embodiment seven:

[0091] First, a pyrolysis furnace with a height of 3.5m and a diameter of 1.5m is selected as the experimental furnace body 1. The number of the outlet pipes 2 is 6, and the corresponding number of the inlet branch pipes 52 is 6. The air intake mode of the outlet pipes 2 is continuous air intake. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0092] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0093] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 750°C.

[0094] In the process, the suspended airflow angles of the six hollow annular air outlet pipes 2 are cross-distributed at 50° and 0°, respectively generating turbulent flow fields with horizontal and upward tilt angles. At the same time, the six air outlet pipes 2 are each provided with an intermittent turbulent airflow field at an airflow frequency of 60 times / min.

[0095] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0096] Embodiment eight:

[0097] First, a pyrolysis furnace with a height of 3m and a diameter of 1.2m is selected as the experimental furnace body 1. The number of the outlet pipes 2 is 5, and the corresponding number of the inlet branch pipes 52 is 5. The air intake mode of the outlet pipes 2 is continuous air intake. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0098] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0099] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 800°C.

[0100] The process maintains the suspended airflow angle at 0° to generate a turbulent flow field of advection, and simultaneously sets five air outlet pipes 2 to provide a turbulent airflow field at an airflow frequency of 120 times / min.

[0101] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0102] Embodiment nine:

[0103] First, a pyrolysis furnace with a height of 4m and a diameter of 1.2m is selected as the experimental furnace body 1. The number of the outlet pipes 2 is 7, and the corresponding number of the inlet branch pipes 52 is 7. The air intake mode of the outlet pipes 2 is continuous air intake. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0104] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0105] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 750°C.

[0106] In the process, the suspended airflow angles of the 7 hollow air outlet pipes 2 are cross-distributed at 50° and 0°, respectively generating turbulent flow fields with horizontal and upward tilt angles. At the same time, the 7 air outlet pipes 2 are respectively arranged to provide intermittent turbulent airflow fields with airflow frequencies of 60 times / min and 120 times / min.

[0107] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0108] Embodiment ten:

[0109] First, a pyrolysis furnace with a height of 4m and a diameter of 1.2m is selected as the experimental furnace body 1. The number of the outlet pipes 2 is 7, and the corresponding number of the inlet branch pipes 52 is 7. The air intake mode of the outlet pipes 2 is continuous air intake. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0110] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0111] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 700°C.

[0112] In the process, the suspended airflow angles of the 7 hollow air outlet pipes 2 are cross-distributed at 40° and 0°, respectively generating turbulent flow fields with horizontal and upward tilt angles. At the same time, the 7 air outlet pipes 2 are respectively arranged to provide intermittent turbulent airflow fields with airflow frequencies of 60 times / min and 120 times / min.

[0113] Embodiment eleven:

[0114] First, a pyrolysis furnace with a height of 4m and a diameter of 1.2m is selected as the experimental furnace body 1. The number of the outlet pipes 2 is 8, and the corresponding number of the inlet branch pipes 52 is 8. The air intake mode of the outlet pipes 2 is continuous air intake. There are 6 independent two-fluid atomizing nozzles 3 above the furnace body 1.

[0115] Secondly, solution preparation: nickel chloride, cobalt chloride and manganese chloride are used as raw materials, respectively, in a ratio of 8:1:1, and deionized water is used as solvent to prepare 1 mol / L chloride salt (nickel cobalt manganese) solution as the base solution.

[0116] Then, the main element solution is used as the matrix solution for high-temperature spray pyrolysis, compressed air is used as the carrier gas, and the feed rate of multiple atomizing nozzles 3 is set to 100 ml / min, the carrier gas flow rate is 100 ml / min, the atomization pressure is 3.0 bar, and the pyrolysis temperature is 800°C.

[0117] In the process, the suspended airflow angles of the 7 hollow air outlet pipes 2 are cross-distributed at 50° and 0°, respectively generating turbulent flow fields with horizontal and upward tilt angles. At the same time, the 7 air outlet pipes 2 are respectively arranged to provide intermittent turbulent airflow fields with airflow frequencies of 60 times / min and 120 times / min.

[0118] Finally, after the reaction is completed, the material is collected, dried in an oven at 100° C., and sieved to obtain a nickel-cobalt-manganese metal oxide precursor.

[0119] The test results of the comparative examples and the embodiments are shown in the following table:

[0120]

[0121]

[0122] It can be seen from the above table that the utility model adopts a furnace body 1 of 3-5m, which can achieve the same effect as a furnace body 1 of 15-20m height, and prepares qualified metal oxide precursors with qualified physical and chemical properties. Compared with traditional pyrolysis furnaces, the utility model has the characteristics of small equipment scale, low cost, high efficiency, etc., and has a very broad prospect for industrial application.

[0123] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A spray drying device, characterized in that: include: The furnace body, the air inlet pipe, the liquid inlet pipe, the atomizing nozzle and multiple air outlet pipes; There are multiple atomizing nozzles, and the multiple atomizing nozzles are all arranged on the top of the furnace body and are connected with the air inlet pipe and the liquid inlet pipe. The multiple air outlet pipes are annularly arranged on the inner side wall of the furnace body and are connected with the air inlet pipe. Each of the air outlet pipes is arranged along a first direction, which is the direction from the top of the furnace body to the bottom, and each of the air outlet pipes is toward the side of the central axis of the furnace body, and is provided with at least one linear air outlet toward the central axis of the furnace body, and the air outlet end of the linear air outlet forms a certain angle θ with respect to the axis of the air outlet pipe body, and the angle θ can change with the opening direction of the linear air outlet.

2. The spray drying equipment according to claim 1, characterized in that An angle θ formed by the outlet end of the linear outlet relative to the axis of the outlet pipe body satisfies the following range: 0°≤θ≤90°.

3. The spray drying equipment according to claim 2, characterized in that An angle θ of the linear air outlet opened on one of the air outlet pipes is a first angle, and an angle θ of the linear air outlet opened on the other air outlet pipe is a second angle, and the first angle is different from the second angle.

4. The spray drying equipment according to claim 1, characterized in that The multiple atomizing nozzles are distributed in a circular ring structure along the second direction on the top of the furnace body, and the circular ring structures formed by the multiple atomizing nozzles are multiple, and the multiple circular ring structures are arranged at intervals. The second direction is the direction from the center of the furnace body to the edge.

5. The spray drying equipment according to claim 4, characterized in that The radius of the furnace body is r, and the number of the atomizing nozzles is x, wherein the relationship between x and r satisfies: 1+4(r-1)≤x≤1+10(r-1).

6. The spray drying equipment according to claim 1, characterized in that The air intake pipe includes an air intake main pipe, multiple air intake branch pipes and a second regulating component. One end of each of the multiple air intake branch pipes is connected to the air intake main pipe, and the other end is respectively connected to the air outlet pipe and the atomizing nozzle, wherein each of the air outlet pipes is provided with an air intake branch pipe in a one-to-one correspondence, and the second regulating component is arranged inside the air intake branch pipe, and any one of the second regulating components corresponds to any one of the air intake branch pipes in a one-to-one correspondence, and the second regulating component includes a gas flow meter and a speed control valve, and is used to regulate the air pressure and frequency of the conveying gas inside any of the air outlet pipes.

7. The spray drying equipment according to claim 6, characterized in that The air pressure P of the gas transported inside the air outlet pipe satisfies the following relationship: 1≤P≤10 bar.

8. The spray drying equipment according to claim 6, characterized in that The frequency of conveying gas inside the gas outlet pipe is 10-120 times / min.

9. The spray drying equipment according to claim 1, characterized in that The liquid inlet pipe includes a liquid inlet main pipe, multiple liquid inlet branch pipes and a first regulating component, wherein one end of each of the multiple liquid inlet branch pipes is connected to the liquid inlet main pipe, and the other end is respectively connected to the atomizing nozzle, the first regulating component is arranged inside the liquid inlet branch pipe, and any one of the first regulating components corresponds to any one of the liquid inlet branch pipes one by one, and the first regulating component includes a liquid flow meter and a controllable flow rate valve.

10. The spray drying equipment according to claim 1, characterized in that The cross section of the air outlet pipe is circular or rectangular.

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