Miniaturized spray pyrolysis device

Abstract

The utility model relates to a miniaturized spray pyrolysis device. The spray pyrolysis device comprises first spray pyrolysis equipment, second spray pyrolysis equipment and a circulating system, a first feed port is formed in the top end of the first spray pyrolysis equipment, and a first discharge port is formed in the bottom end of the first spray pyrolysis equipment; a second feed port is formed in the top end of the second spray pyrolysis equipment, and a second discharge port is formed in the bottom end of the second spray pyrolysis equipment; the first spray pyrolysis equipment is connected in series to a second feeding hole of the second spray pyrolysis equipment from a first discharging hole through a first pipeline; the circulating system comprises a second pipeline and separation equipment arranged on the second pipeline; and the circulating system is connected with the second feeding hole and the second discharging hole through a second pipeline. According to the miniaturized spray pyrolysis device provided by the utility model, the occupied space of the device is reduced, the pyrolysis time of materials is prolonged, and the materials are fully pyrolyzed.

Description

TECHNICAL FIELD

[0001] The utility model relates to spray pyrolysis technical field especially relates to a small -size spray pyrolysis device. BACKGROUND

[0002] With the development of new energy industry market, spray pyrolysis process is gradually applied to the preparation of lithium battery materials in recent years, compared with the traditional co-precipitation-sintering process, spray pyrolysis process has a series of advantages such as short process flow, low energy consumption, no three waste emissions, etc., and has attracted more and more researchers' attention in recent years.

[0003] At present, the industrialized spray pyrolysis equipment mainly consists of solution preparation tank-high temperature hearth-receiving system-waste gas treatment system and several parts, since the spray process is via atomized droplets from the top of the hearth, and the powder material and acidic gas are generated through high-temperature physical and chemical process, therefore, the process has high requirements (such as height, width, etc.) for the spray pyrolysis hearth, if a small spray pyrolysis hearth is used, the height is not enough, and the metal salt solution cannot be effectively thermally decomposed, and the product with qualified physical and chemical properties cannot be obtained. The height of the pilot production to mass production hearth is 10-20m, and the mass production equipment often has high requirements on height, size, etc., and the requirements on the equipment itself are often high, which leads to the fact that the current small test equipment (about 5m in height) on the market cannot effectively guide the mass production process.

[0004] CN109539792A discloses a kind of spray pyrolysis device of ternary positive electrode precursor and its use method, the device includes first spray pyrolysis device and second spray pyrolysis device, the first spray pyrolysis device discharge port is connected with conveying device, and the outlet of the conveying device is arranged in the cavity of the second spray pyrolysis device. By connecting two groups of spray pyrolysis devices U-shapedly, the design diameter of the device is reduced while ensuring sufficient pyrolysis time of material in the furnace, and the chlorine content in the product is reduced, but the height of the spray pyrolysis device at both ends of the U-shaped connection is still limited, and the pyrolysis time and pyrolysis effect need to be improved.

[0005] Therefore, how to design a small-sized spray pyrolysis device that can prolong the pyrolysis time, spray pyrolysis more fully and occupy smaller area has become a problem to be solved at present. UTILITY MODEL CONTENTS

[0006] To solve the above technical problems, the utility model provides a kind of small-sized spray pyrolysis device. The utility model adopts the small-sized spray pyrolysis device of double-section small-sized spray pyrolysis equipment combined with circulating system, which reduces the space occupied by the device, prolongs the pyrolysis time of the device to the material and makes the material fully pyrolyzed, and has very broad industrial application prospect.

[0007] To achieve the above object, the utility model adopts the following technical scheme:

[0008] A miniaturized spray pyrolysis device, comprising a first spray pyrolysis device, a second spray pyrolysis device and a circulation system.

[0009] The top end of the first spray pyrolysis device is provided with a first feeding port, and the bottom end of the first spray pyrolysis device is provided with a first discharging port.

[0010] The top end of the second spray pyrolysis device is provided with a second feeding port, and the bottom end of the second spray pyrolysis device is provided with a second discharging port.

[0011] The first spray pyrolysis device is connected to the second feeding port of the second spray pyrolysis device through a first pipeline in series from the first discharging port.

[0012] The circulation system comprises a second pipeline and a separation device arranged on the second pipeline.

[0013] The circulation system is connected to the second feeding port and the second discharging port through the second pipeline.

[0014] As a preferred technical scheme of the utility model, the height of the first spray pyrolysis device and the second spray pyrolysis device is independently selected from 0.5-6m, for example, 0.5m, 1m, 1.5m, 2m, 2.5m, 3m, 3.5m, 4m, 4.5m, 5m, 5.5m or 6m, etc.

[0015] Preferably, the diameter of the bottom end plane of the first spray pyrolysis device and the second spray pyrolysis device is independently selected from 0.5-3m, for example, 0.5m, 1m, 1.5m, 2m, 2.5m or 3m, etc.

[0016] As a preferred technical scheme of the utility model, the separation device comprises a first cyclone separation device and a second cyclone separation device.

[0017] Preferably, the side end of the first cyclone separation device is provided with a feeding port, the lower end is provided with a material collecting port, and the upper end is provided with an air outlet.

[0018] The side end of the second cyclone separation device is provided with a feeding port, the lower end is provided with a material collecting port, and the upper end is provided with an air outlet.

[0019] As a preferred technical scheme of the utility model, the first cyclone separation device is located at the upper end of the second spray pyrolysis device, the material collecting port of the first cyclone separation device is arranged towards the direction of the second spray pyrolysis device, and the air outlet is arranged towards the direction away from the second spray pyrolysis device.

[0020] Preferably, the material collecting port of the first cyclone separation device is connected with the second material inlet of the second spray pyrolysis device through the second pipeline.

[0021] Preferably, the material inlet of the first cyclone separation device is connected with the air outlet of the second cyclone separation device through the second pipeline.

[0022] Preferably, the material inlet of the second cyclone separation device is connected with the second material outlet of the second spray pyrolysis device through the second pipeline.

[0023] Preferably, an automatic on-off valve is arranged at the material inlet of the second cyclone separation device.

[0024] In the utility model, the automatic on-off valve controls the material to enter the second cyclone separation device, when the automatic on-off valve is in the closed state (see Figure 2 ), the material delivered from the second material outlet of the second spray pyrolysis device cannot enter the second cyclone separation device, but directly bypasses the second cyclone separation device through the second pipeline to enter the first cyclone separation device for separation; when the automatic on-off valve is in the open state (see Figure 3 ), the path of the material delivered from the second spray pyrolysis device directly bypassing the second cyclone separation device through the second pipeline is blocked, and the material delivered from the second spray pyrolysis device enters the second cyclone separation device through the material inlet of the second cyclone separation device, for material separation; the separated material, the qualified material is collected through the material collecting port, and the unqualified material reaches the second pipeline through the air outlet and is delivered to the first cyclone separation device for circulation.

[0025] In the utility model, the density of the qualified material is not specifically limited, and a person skilled in the art can select according to the needs.

[0026] As the preferred technical scheme of the utility model, the circulating system further comprises a discharging unit arranged on the second pipeline and located between the second material inlet of the second spray pyrolysis device and the material collecting port of the first cyclone separation device.

[0027] Preferably, the discharging unit comprises a first discharging valve and a second discharging valve located above the first discharging valve, and at least one of the first discharging valve and the second discharging valve is in the closed state.

[0028] As the preferred technical scheme of the utility model, the spray pyrolysis device further comprises a bag type dust removal device.

[0029] Preferably, the bag type dust removal device is provided with a material inlet and outlet at the lower end and an air outlet at the upper end.

[0030] Preferably, the inlet and outlet of the bag type dust removal equipment is connected with the air outlet of the first cyclone separation equipment through a third pipeline.

[0031] As the preferred technical scheme of the utility model, the spray pyrolysis device further comprises a material collecting unit.

[0032] Preferably, the material collecting unit comprises a first material collecting component and a second material collecting component.

[0033] Preferably, the first material collecting component is located below the second cyclone separation equipment and is connected with the material collecting port of the second cyclone separation equipment.

[0034] Preferably, the second material collecting component is located below the bag type dust removal equipment and is connected with the inlet and outlet of the bag type dust removal equipment through a fourth pipeline.

[0035] As the preferred technical scheme of the utility model, the spray pyrolysis device further comprises a tail gas treatment unit.

[0036] Preferably, the tail gas treatment unit is connected with the air outlet of the bag type dust removal equipment.

[0037] As the preferred technical scheme of the utility model, the spray pyrolysis device further comprises a fluid control system.

[0038] Preferably, the fluid control system comprises a positive pressure air supply device and a negative pressure air induction device.

[0039] As the preferred technical scheme of the utility model, the positive pressure air supply device is arranged on the side of the first spray pyrolysis device away from the second spray pyrolysis device.

[0040] Preferably, the positive pressure air supply device is connected with the starting end of the first pipeline and sequentially flows through the first material outlet of the first spray pyrolysis device and the second material inlet of the second spray pyrolysis device through the first pipeline and is connected with the cavity of the second spray pyrolysis device.

[0041] Preferably, the negative pressure air induction device is connected with the cavity of the bag type dust removal equipment.

[0042] The main flow direction of the fluid controlled by the positive pressure air supply device and the negative pressure air induction device in the fluid control system of the utility model is as follows: from the positive pressure air supply device-first material outlet of the first spray pyrolysis device-second material inlet of the second spray pyrolysis device-second material outlet of the second spray pyrolysis device-second cyclone separation equipment-first cyclone separation equipment-bag type dust removal equipment-negative pressure air induction device.

[0043] The main conveying direction of the material in the spray pyrolysis device is: from the first feed inlet of the first spray pyrolysis equipment - the first discharge outlet of the first spray pyrolysis equipment - the second feed inlet of the second spray pyrolysis equipment - the second discharge outlet of the second spray pyrolysis equipment - the feed inlet of the first cyclone separation equipment - the air outlet of the first cyclone separation equipment - the bag type dust removal equipment, or from the first feed inlet of the first spray pyrolysis equipment - the first discharge outlet of the first spray pyrolysis equipment - the second feed inlet of the second spray pyrolysis equipment - the second discharge outlet of the second spray pyrolysis equipment - the feed inlet of the second cyclone separation equipment - the air outlet of the second cyclone separation equipment - the feed inlet of the first cyclone separation equipment - the air outlet of the first cyclone separation equipment - the bag type dust removal equipment.

[0044] Compared with the prior art, the spray pyrolysis device has at least the following beneficial effects:

[0045] (1) The miniaturized spray pyrolysis device adopts the first spray pyrolysis equipment and the second spray pyrolysis equipment connected in series and a circulating system to cooperate with each other, and the pipelines for fluid flow and material conveying are used to connect various components in the device, and the separation equipment is arranged on the second pipeline in the circulating system, so that the actual land occupation space (height and land occupation area) of the spray pyrolysis device can be reduced, the material spray pyrolysis time can be prolonged, and the material to be treated can be fully and efficiently pyrolyzed, so that the target product with excellent quality can be obtained.

[0046] (2) The spray pyrolysis device, a first cyclone separation device is arranged at the upper end of the second feeding port of the second spray pyrolysis equipment, and the first cyclone separation device is used for separating gas and solid of the material after twice pyrolysis (or multiple cycle pyrolysis), the solid still enters the second spray pyrolysis equipment to be treated by cycle spray pyrolysis, so that the density of the material is improved, and finally the material enters the second cyclone separation device, and the material is collected in the material collecting unit below the second cyclone separation device, and the second cyclone separation device arranged on the second pipeline connected with the second discharging port of the second spray pyrolysis equipment is used for separating the light and heavy materials of the material discharged from the second discharging port at the bottom of the second spray pyrolysis equipment, the heavy material (i.e. the density reaches the requirement of the target product) is collected in the first material collecting part of the material collecting unit, and the light material (the density does not reach the requirement of the target product) still continues to enter the pipeline of the next link and reaches the first cyclone separation device, and the light material is pyrolyzed in the spray pyrolysis equipment again, so that the light material is repeatedly circulated, the air outlet of the second cyclone separation device is connected with the feeding port of the first cyclone separation device, and the second cyclone separation device is used for making the light material of the second cyclone separation system continue to be separated by the first cyclone separation system, so that the light material is repeatedly circulated.

[0047] (3) The spray pyrolysis device, a first cyclone separation device is arranged at the upper end of the second feeding port of the second spray pyrolysis equipment, and the first cyclone separation device is used for separating gas and solid of the material after twice pyrolysis (or multiple cycle pyrolysis), the solid still enters the second spray pyrolysis equipment to be treated by cycle spray pyrolysis, so that the density of the material is improved, and finally the material enters the second cyclone separation device, and the material is collected in the material collecting unit below the second cyclone separation device, and the second cyclone separation device arranged on the second pipeline connected with the second discharging port of the second spray pyrolysis equipment is used for separating the light and heavy materials of the material discharged from the second discharging port at the bottom of the second spray pyrolysis equipment, the heavy material (i.e. the density reaches the requirement of the target product) is collected in the first material collecting part of the material collecting unit, and the light material (the density does not reach the requirement of the target product) still continues to enter the pipeline of the next link and reaches the first cyclone separation device, and the light material is pyrolyzed in the spray pyrolysis equipment again, so that the light material is repeatedly circulated, the air outlet of the second cyclone separation device is connected with the feeding port of the first cyclone separation device, and the second cyclone separation device is used for making the light material of the second cyclone separation system continue to be separated by the first cyclone separation system, so that the light material is repeatedly circulated. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is a structure schematic view of the small-sized spray pyrolysis device.

[0049] Figure 2 is a partial schematic view of the small-sized spray pyrolysis device when the automatic on-off valve is in the closed state.

[0050] Figure 3 is a partial schematic view of the small-sized spray pyrolysis device when the automatic on-off valve is in the open state.

[0051] In the figure, 1, first spray pyrolysis device; 101, first feeding port; 102, first discharging port; 2, second spray pyrolysis device; 201, second feeding port; 202, second discharging port; 3, first cyclone separation device; 4, second cyclone separation device; 5, discharging unit; 501, first discharging valve; 502, second discharging valve; 6, bag type dust removal device; 7, material collecting unit; 701, first material collecting component; 702, second material collecting component; 8, tail gas treatment unit; 9, positive pressure air supply device; 10, negative pressure air induction device; 11, automatic on-off valve; 12, first pipeline; 13, second pipeline; 14, third pipeline; 15, fourth pipeline. DETAILED DESCRIPTION

[0052] In order to make the technical scheme, objectives and advantages of the utility model clearer, the following will make further detailed description of the utility model through specific embodiment and in combination with the drawings. It should be understood that the specific implementation manner described herein is only used for illustrating and explaining the utility model, and is not used for limiting the utility model.

[0053] In the description of the utility model, it should be pointed out that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the utility model, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For the electrical and communication field, it can be wired connection, or wireless connection. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0055] Embodiment 1

[0056] The embodiment provides a small spray pyrolysis device, and a structural schematic diagram is shown in Figure 1 which comprises a first spray pyrolysis device 1, a second spray pyrolysis device 2, a circulating system, a bag type dust removal device 6, a material collecting unit 7, a tail gas treatment unit 8 and a fluid control system.

[0057] Specifically, the first spray pyrolysis device 1 has a height of 3 m and a diameter of 1.2 m at the bottom end, the top end of the first spray pyrolysis device 1 is provided with a first feeding port 101 which is an atomizing nozzle, and the bottom end of the first spray pyrolysis device 1 is provided with a first discharging port 102; the second spray pyrolysis device 2 has a height of 3 m and a diameter of 1.2 m at the bottom end, the top end of the second spray pyrolysis device 2 is provided with a second feeding port 201, and the bottom end of the second spray pyrolysis device 2 is provided with a second discharging port 202; the first spray pyrolysis device 1 and the second spray pyrolysis device 2 are connected in series, and the first discharging port 102 of the first spray pyrolysis device 1 is connected to the second feeding port 201 of the second spray pyrolysis device 2 through a first pipeline 12.

[0058] The circulating system comprises a second pipeline 13, a separation device and a discharging unit 5 arranged on the second pipeline 13. The second pipeline 13 is a multi-section conveying channel for connecting various components in the circulating system, and the circulating system is connected to the second feeding port 201 and the second discharging port 202 of the second spray pyrolysis device 2 through the second pipeline 13; the separation device comprises a first cyclone separation device 3 and a second cyclone separation device 4, wherein the side end of the first cyclone separation device 3 is provided with a feeding port, the lower end of the first cyclone separation device 3 is provided with a collecting port, and the upper end of the first cyclone separation device 3 is provided with an air outlet; the side end of the second cyclone separation device 4 is provided with a feeding port, the lower end of the second cyclone separation device 4 is provided with a collecting port, and the upper end of the second cyclone separation device 4 is provided with an air outlet; the first cyclone separation device 3 is located at the upper end of the second spray pyrolysis device 2, the collecting port of the first cyclone separation device 3 is arranged towards the direction of the second spray pyrolysis device 2, the air outlet of the first cyclone separation device 3 is arranged towards the direction away from the second spray pyrolysis device 2, the collecting port of the first cyclone separation device 3 is connected to the second feeding port 201 of the second spray pyrolysis device 2 through the second pipeline 13, the feeding port of the first cyclone separation device 3 is connected to the air outlet of the second cyclone separation device 4 through the second pipeline 13, the feeding port of the second cyclone separation device 4 is connected to the second discharging port 202 of the second spray pyrolysis device 2 through the second pipeline 13, and an automatic on-off valve 11 is arranged on the feeding port of the second cyclone separation device 4; when the automatic on-off valve 11 is in a closed state as shown in Figure 2 , the material conveyed from the second spray pyrolysis device 2 bypasses the second cyclone separation device 4 and directly reaches the first cyclone separation device 3 through the second pipeline 13; when the automatic on-off valve 11 is in an open state as shown in Figure 3 , the material conveyed from the second spray pyrolysis device 2 enters the second cyclone separation device 4 through the feeding port of the second cyclone separation device 4 to perform a separation operation; the discharging unit 5 is located between the second feeding port 201 of the second spray pyrolysis device 2 and the collecting port of the first cyclone separation device 3, and the discharging unit 5 comprises a first discharging valve 501 and a second discharging valve 502 arranged above the first discharging valve 501, at least one of the first discharging valve 501 and the second discharging valve 502 is in a closed state.

[0059] The lower end of the bag type dust removal equipment 6 is provided with an inlet and outlet port, and the upper end of the equipment is provided with an air outlet; the inlet and outlet port of the bag type dust removal equipment 6 is connected with the air outlet of the first cyclone separation equipment 3 through the third pipeline 14, and the air outlet of the bag type dust removal equipment 6 is connected with the tail gas treatment unit 8, which is used for treating the gas discharged from the bag type dust removal equipment 6.

[0060] The material collecting unit 7 comprises a first material collecting component 701 and a second material collecting component 702; the first material collecting component 701 is located below the second cyclone separation equipment 4 and is connected with the material collecting port of the second cyclone separation equipment 4; the second material collecting component 702 is located below the bag type dust removal equipment 6 and is connected with the inlet and outlet port of the bag type dust removal equipment 6 through the fourth pipeline 15, which is used for collecting the solid product separated from the bag type dust removal equipment 6.

[0061] The fluid control system comprises a positive pressure air supply equipment 9 and a negative pressure air induction equipment 10; the positive pressure air supply equipment 9 is arranged at the starting end of the first pipeline 12 and is located on the side of the first spray pyrolysis equipment 1 away from the second spray pyrolysis equipment 2; the first pipeline 12 connected with the positive pressure air supply equipment 9 sequentially passes through the first material outlet 102 of the first spray pyrolysis equipment 1 and the second material inlet 201 of the second spray pyrolysis equipment 2 and is connected with the cavity of the second spray pyrolysis equipment 2; the negative pressure air induction equipment 10 is arranged at the tail end of the spray pyrolysis device and is connected with the cavity of the bag type dust removal equipment 6.

[0062] The preparation method of the nickel-cobalt-manganese metal oxide precursor further illustrates the use method of the spray pyrolysis device provided in the embodiment:

[0063] (1) 8:1:1 of nickel chloride, cobalt chloride and manganese chloride by mass ratio as raw materials, deionized water as solvent, prepared into a 1 mol / L chloride salt solution as a bottom liquid, the solution volume is 10L, and the spray pyrolysis reaction is carried out;

[0064] (2) open the positive pressure air supply equipment 9 and the negative pressure air induction equipment 10, then the bottom liquid obtained in step (1) is introduced into the cavity of the first spray pyrolysis equipment 1 through the first material inlet 101 of the atomizing nozzle at the upper end of the first spray pyrolysis equipment 1 to carry out the first spray pyrolysis, the temperature of the first spray pyrolysis equipment 1 is 800℃, and the material after the first spray pyrolysis is obtained;

[0065] (3) the material after the first spray pyrolysis obtained in step (2) is transported from the first material outlet 102 to the second material inlet 201 at the upper end of the second spray pyrolysis equipment 2 through the first pipeline 12, and the second spray pyrolysis is carried out in the second spray pyrolysis equipment 2, the temperature of the second spray pyrolysis equipment 2 is 800℃, and the material after the second spray pyrolysis is obtained;

[0066] (4) The material after the spray pyrolysis in step (3) is transported from the second discharge port 202 to the circulating system, and the flow path of the material after the secondary spray pyrolysis is controlled by the automatic on-off valve 11, and the on-off frequency of the automatic on-off valve 11 is initially in the closed state, and is opened once every 60 seconds, and each opening lasts for 3 seconds. When the automatic on-off valve 11 is in the closed state, the second material bypasses the second cyclone separation device 4 through the second pipeline 13 and directly enters the first cyclone separation device 3, and is separated, wherein the material with a density greater than 0.1 g / cm 2 is collected by the second discharge valve 502 and the first discharge valve 501 of the discharge unit 5, and the two valves are in a state of one closed and one opened, and the switching interval is 60 seconds, and the material collected by the discharge unit 5 continues to enter the second spray pyrolysis device 2 for spray pyrolysis reaction and circulation treatment, and the material with a density less than 0.1 g / cm 2 is transported out from the air outlet at the upper end of the first cyclone separation device 3 and is transported to the bag-type dust removal device 6 through the third pipeline 14;

[0067] When the automatic on-off valve 11 is in the opened state, the material is transported to the second cyclone separation device 4 through the second pipeline 13 for separation, and the material with a density greater than 0.6 g / cm 3 is collected in the first collection component 701 from the material collection port of the second cyclone separation device 4, and the material with a density less than 0.6 g / cm 3 is transported to the second pipeline 13 from the air outlet of the second cyclone separation device 4 and continues to be transported to the first cyclone separation device 3 for separation and circulation treatment.

[0068] (5) The material transported to the bag-type dust removal device 6 in step (4) is subjected to gas-solid separation in the bag-type dust removal device 6, the obtained solid material is transported to the second collection component 702 from the fourth pipeline 15 below the inlet and outlet port of the bag-type dust removal device 6 for collection, and the obtained gas material reaches the tail gas treatment unit 8 from the gas outlet arranged above the bag-type dust removal device 6 for tail gas treatment;

[0069] (6) The material collected by the first collection component 701 is dried in a 100℃ oven, and a nickel-cobalt-manganese metal oxide precursor is obtained after sieving.

[0070] Example 2

[0071] The difference between this example and example 1 is that the height of the first spray pyrolysis device 1 in the spray pyrolysis device provided in this example is 2.5 m, and the diameter of the bottom plane is 1 m, and the height of the second spray pyrolysis device 2 is 2.5 m, and the diameter of the bottom plane is 1 m. The rest is the same as example 1.

[0072] Example 3

[0073] The difference between this embodiment and embodiment 1 is only that the height of the first spray pyrolysis device 1 is 2 m and the diameter of the bottom plane is 1 m, and the height of the second spray pyrolysis device 2 is 1 m and the diameter of the bottom plane is 0.5 m. The rest is the same as embodiment 1.

[0074] Embodiment 4

[0075] The difference between this embodiment and embodiment 1 is only that the first cyclone separation device 3, the first discharge valve 501 and the second discharge valve 502 are omitted in the spray pyrolysis device provided in this embodiment. The rest is the same as embodiment 1.

[0076] Embodiment 5

[0077] The difference between this embodiment and embodiment 1 is only that the second cyclone separation device 4 is omitted in the spray pyrolysis device provided in this embodiment. The rest is the same as embodiment 1.

[0078] Comparative Example 1

[0079] The difference between this comparative example and embodiment 1 is only that the second spray pyrolysis device 2 is omitted in the spray pyrolysis device provided in this comparative example, and the first discharge port 102 of the first spray pyrolysis device 1 is connected with the feed port of the second cyclone separation device 4 through the second pipeline 13, and the upper end of the first spray pyrolysis device 1 is provided with two feed ports, one of which is used for feeding the bottom liquid, and the other is connected with the first discharge valve 501 through the second pipeline 13. The rest is the same as embodiment 1.

[0080] Comparative Example 2

[0081] The difference between this comparative example and embodiment 1 is only that the spray pyrolysis device provided in this comparative example is a conventional small-sized spray pyrolysis device, the height of which is 3 m and the diameter of the bottom plane is 1.2 m. The rest is the same as embodiment 1.

[0082] Comparative Example 3

[0083] The difference between this comparative example and embodiment 1 is only that the spray pyrolysis device provided in this comparative example is a conventional large-sized spray pyrolysis device, the height of which is 10 m and the diameter of the bottom plane is 3 m. The rest is the same as embodiment 1.

[0084] The nickel-cobalt-manganese metal oxide precursor obtained in the above-mentioned embodiments 1-5 and comparative examples 1-3 is detected for physical and chemical properties, and the mass percentage of nickel-cobalt-manganese metal in the obtained precursor material and the density of the precursor are recorded, and the test results are shown in Table 1:

[0085] Table 1

[0086]

[0087]

[0088] From the test results can be seen:

[0089] (1) From example 1 to example 3 can be seen, the utility model discloses a small spray pyrolysis device that adopts double-section small spray pyrolysis equipment combined with a circulating system, which not only reduces the occupied space of the device, but also prolongs the pyrolysis time of the material and makes the material fully pyrolyzed.

[0090] (2) By comparing example 1 and example 4, it can be seen that if the first cyclone separation equipment is omitted, the effect of effectively circulating the pyrolysis material cannot be achieved, and the final material has a low main content and a low density that cannot reach the expected value.

[0091] (3) By comparing example 1 and example 5, it can be seen that if the second cyclone separation equipment is omitted, the final material has a low main content and a low density that cannot reach the expected value.

[0092] (4) By comparing example 1 and comparative example 1, it can be seen that if the second spray pyrolysis equipment is omitted, the effect of using a one-section small spray pyrolysis equipment combined with a circulating system is poor, the main content is low, and the density is low.

[0093] (5) By comparing example 1 and comparative example 2-3, it can be seen that the physicochemical properties of the metal oxide precursor prepared by the spray pyrolysis device with a specific design can reach the physicochemical properties of the metal oxide precursor obtained by a large-scale spray pyrolysis device, and are significantly better than the metal oxide precursor prepared by a small-scale spray pyrolysis device with the same height and occupied area. Compared with traditional spray pyrolysis equipment, the utility model has the advantages of small equipment scale, low cost and high efficiency, and has a very broad industrial application prospect.

[0094] In summary, the small spray pyrolysis device of the utility model adopts a first spray pyrolysis equipment and a second spray pyrolysis equipment connected in series and a circulating system to cooperate with each other, and a pipeline for fluid flow and material conveying is used to connect each component in the device, and a separation equipment is arranged on the second pipeline in the circulating system, which can prolong the pyrolysis time of the material while reducing the actual occupied space (height and occupied area) of the spray pyrolysis device, so that the material to be treated is fully and efficiently pyrolyzed, and high-quality target products are obtained. The device has a very broad industrial application prospect.

[0095] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and those skilled in the art should understand that any changes or replacements that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present application all fall within the protection scope and disclosure scope of the present application.

Claims

1. A miniaturized spray pyrolysis apparatus, characterized by, The spray pyrolysis device comprises a first spray pyrolysis device, a second spray pyrolysis device and a circulation system; The top end of the first spray pyrolysis device is provided with a first feeding port, and the bottom end of the first spray pyrolysis device is provided with a first discharging port; The top end of the second spray pyrolysis device is provided with a second feeding port, and the bottom end of the second spray pyrolysis device is provided with a second discharging port; The first spray pyrolysis device is connected to the second feeding port of the second spray pyrolysis device through a first pipeline in series from the first discharging port; The circulation system comprises a second pipeline and a separation device arranged on the second pipeline; The circulation system is connected to the second feeding port and the second discharging port through the second pipeline.

2. The compact spray pyrolysis apparatus of claim 1, wherein, The height of the first spray pyrolysis device and the second spray pyrolysis device is independently selected from 0.5-6m; The diameter of the bottom end plane of the first spray pyrolysis device and the second spray pyrolysis device is independently selected from 0.5-3m.

3. The compact spray pyrolysis apparatus of claim 1, wherein, The separation device comprises a first cyclone separation device and a second cyclone separation device; The side end of the first cyclone separation device is provided with a feeding port, the lower end is provided with a material collecting port, and the upper end is provided with an air outlet; The side end of the second cyclone separation device is provided with a feeding port, the lower end is provided with a material collecting port, and the upper end is provided with an air outlet.

4. The compact spray pyrolysis apparatus of claim 3, wherein, The first cyclone separation device is located at the upper end of the second spray pyrolysis device, the material collecting port of the first cyclone separation device is arranged towards the direction of the second spray pyrolysis device, and the air outlet is arranged towards the direction away from the second spray pyrolysis device; The material collecting port of the first cyclone separation device is connected to the second feeding port of the second spray pyrolysis device through the second pipeline; The feeding port of the first cyclone separation device is connected to the air outlet of the second cyclone separation device through the second pipeline; The feeding port of the second cyclone separation device is connected to the second discharging port of the second spray pyrolysis device through the second pipeline; An automatic on-off valve is further arranged at the feeding port of the second cyclone separation device.

5. The compact spray pyrolysis apparatus of claim 3, wherein, The circulation system further comprises a discharging unit arranged on the second pipeline and located between the second feeding port of the second spray pyrolysis device and the material collecting port of the first cyclone separation device; The discharging unit comprises a first discharging valve and a second discharging valve located above the first discharging valve, and at least one of the first discharging valve and the second discharging valve is in a closed state.

6. The compact spray pyrolysis apparatus of claim 3, wherein, The spray pyrolysis device further comprises a bag type dust removal device; The lower end of the bag type dust removal device is provided with an inlet and outlet port, and the upper end of the device is provided with an air outlet; The inlet and outlet port of the bag type dust removal device is connected to the air outlet of the first cyclone separation device through a third pipeline.

7. The compact spray pyrolysis apparatus of claim 6, wherein, The spray pyrolysis device further comprises a material collecting unit; The material collecting unit comprises a first material collecting component and a second material collecting component; The first material collecting component is located below the second cyclone separation device and is connected to the material collecting port of the second cyclone separation device; The second material collecting component is located below the bag type dust removal device and is connected to the inlet and outlet port of the bag type dust removal device through a fourth pipeline.

8. The compact spray pyrolysis apparatus of claim 6, wherein, The spray pyrolysis device further comprises a tail gas treatment unit; The tail gas treatment unit is connected with an air outlet of the bag type dust removal equipment.

9. The compact spray pyrolysis apparatus of claim 6, wherein, The spray pyrolysis device further comprises a fluid control system. The fluid control system comprises a positive pressure air supply device and a negative pressure air suction device.

10. The compact spray pyrolysis apparatus of claim 9, wherein, The positive pressure air supply device is arranged on a side of the first spray pyrolysis device away from the second spray pyrolysis device. The positive pressure air supply device is connected with a starting end of the first pipeline, and sequentially flows through a first discharge port of the first spray pyrolysis device and a second feed port of the second spray pyrolysis device through the first pipeline, and is connected with the cavity of the second spray pyrolysis device. The negative pressure air suction device is connected with the cavity of the bag type dust removal equipment.

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