Control system and control method for centrifugal spray granulation of indium tin oxide slurry

Abstract

The invention discloses a control system for centrifugal spray granulation of indium tin oxide slurry, and relates to the technical field of spray granulation, the control system comprises a slurry stirring device and a centrifugal spray granulation device, the discharge end of the slurry stirring device is connected with the feed end of the centrifugal spray granulation device through a slurry conveying pipeline; the centrifugal spray granulation device comprises a stirring tank, a hollow interlayer is arranged in a shell of the stirring tank, a stirring mechanism is arranged in the stirring tank, and the stirring mechanism comprises a stirring paddle internally provided with a heat circulation pipe; a hot tail gas exhaust port of the centrifugal spray granulation device is respectively connected with the hollow interlayer, the heat circulating pipe and a gas input port of an associated heating pipe arranged on the outer wall of the slurry conveying pipeline through a gas pipeline; the system can effectively control the temperature difference between the slurry and the spray tower, realizes recycling of tail gas, can reduce the cost and is more environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of spray granulation, and in particular to a control system and a control method for centrifugal spray granulation of indium tin oxide slurry. Background Art

[0002] In the centrifugal spray granulation process of indium tin oxide slurry, the temperature difference between the slurry and the spray tower is uncontrollable, which can easily lead to problems such as widening of particle size distribution, distortion of particle shape, serious agglomeration and component segregation. The main reason for these problems is that the temperature fluctuation of the slurry leads to different droplet drying speeds, different particle surface properties, and different component diffusion and reaction rates.

[0003] In terms of production efficiency, unstable temperature difference will also lead to prolonged drying time and reduced equipment processing capacity, which cannot meet the needs of large-scale industrial production. When the equipment is running, the thermal stress caused by the temperature difference will aggravate equipment loss, and it is also easy to cause blockage and scaling, increase maintenance costs, and affect normal operation.

[0004] Moreover, when the poor quality products obtained due to unstable temperature difference are used for target sputtering, the sputtering rate is unstable, the film uniformity is poor, the electrical and optical properties are affected, and the requirements for high-quality film preparation cannot be met, hindering the expansion of applications in related fields. Summary of the invention

[0005] The object of the present invention is to provide a control system and a control method for centrifugal spray granulation of indium tin oxide slurry to solve the following technical problems:

[0006] How to improve the thermal stability of indium tin oxide slurry in centrifugal spray granulation process.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] In a first aspect, the present invention discloses a control system for centrifugal spray granulation of indium tin oxide slurry, comprising a slurry stirring device and a centrifugal spray granulation device, wherein the discharge end of the slurry stirring device is connected to the feed end of the centrifugal spray granulation device through a slurry delivery pipeline, and a feed pump is installed on the slurry delivery pipeline; the centrifugal spray granulation device comprises a stirring tank, a hollow interlayer is provided in the shell of the stirring tank, and a stirring mechanism is built in the stirring tank, and the stirring mechanism comprises a stirring paddle with a heat circulation tube arranged inside;

[0009] The hot exhaust gas outlet of the centrifugal spray granulation device is connected to the gas input ports of the hollow interlayer, the heat circulation pipe and the associated heating pipe arranged on the outer wall of the slurry conveying pipe through gas pipelines; the air inlet of the centrifugal spray granulation device is provided with a hot air supply mechanism, the air inlet end of the hot air supply mechanism is connected to the exhaust gas reflux pipe, and the gas output ports of the hollow interlayer, the heat circulation pipe and the associated heating pipe are connected to the exhaust gas reflux pipe through gas pipelines.

[0010] In a further embodiment of the present invention: an electric heating rod is further provided in the stirring paddle, and a conductive slide rail is provided at one end of the electric heating rod, and the conductive slide rail can be connected to an external power source in a touch-type manner.

[0011] In a further scheme of the present invention: the hot exhaust gas outlet of the centrifugal spray granulation device is provided with a No. 1 three-way solenoid valve, and the other two connecting ends of the No. 1 three-way solenoid valve are respectively connected to gas pipelines, one of the other ends of the gas pipeline is connected to a No. 2 three-way solenoid valve, and the other end of the other gas pipeline is connected to the associated heating pipe; the other two connecting ends of the No. 2 three-way solenoid valve are respectively connected to the gas input ports of the hollow interlayer and the heat circulation pipe.

[0012] In a further embodiment of the present invention: the centrifugal spray granulation device includes a hot air supply mechanism, a spray granulation tower, a sub-tower, a dust removal tower and an exhaust fan, the gas outlet of the hot air supply mechanism is connected to the gas inlet of the spray granulation tower through a gas pipeline, the gas outlet of the spray granulation tower is connected to the gas inlet of the sub-tower through a gas pipeline; the gas outlet of the sub-tower is connected to the gas inlet of the dust removal tower through a gas pipeline, the gas outlet of the dust removal tower is connected to the gas inlet of the exhaust fan through a gas pipeline, and the gas outlet of the exhaust fan is connected to a No. 1 three-way solenoid valve through a gas pipeline.

[0013] In a further embodiment of the present invention: the hot air supply system comprises an external air bin, a heater and a blower connected in sequence, the gas outlet of the blower is connected to the gas inlet of the spray granulation tower through a gas pipeline; a coarse-effect filter is also provided between the external air bin and the heater, and a high-efficiency filter is provided between the blower and the spray granulation tower.

[0014] In a further embodiment of the present invention: a No. 3 three-way solenoid valve is installed at the gas output end of the exhaust gas return pipe, and the other two connecting ends of the No. 3 three-way solenoid valve are respectively connected to the external air chamber and the exhaust gas chimney through gas pipelines.

[0015] In a further embodiment of the present invention, variable pressure relief valves are provided on the gas pipelines whose gas outlets of the hollow interlayer, the heat circulation pipe and the associated heating pipe are respectively connected to the tail gas return pipe.

[0016] In a further embodiment of the present invention, temperature sensors are installed inside the stirring tank, on the gas pipeline connecting the No. 2 three-way solenoid valve and the hollow interlayer, on the associated heating pipe, and on the exhaust gas reflux pipe.

[0017] In a further embodiment of the present invention: the control system includes a control center, and the No. 1 three-way solenoid valve, No. 2 three-way solenoid valve, No. 3 three-way solenoid valve, feed pump, external power supply, all variable pressure relief valves and all temperature sensors are communicatively connected to the control center.

[0018] In a second aspect, the present invention further discloses a control method for the control system of the centrifugal spray granulation of indium tin oxide slurry as described above, comprising the following steps:

[0019] Step 1: The hot tail gas of the centrifugal spray granulation device flows to the No. 2 three-way solenoid valve and the associated heating pipe through the No. 1 three-way solenoid valve, and the hot tail gas from the No. 2 three-way solenoid valve flows to the hollow interlayer and the heat circulation pipe for heating;

[0020] Step 2: The temperature sensor inside the stirring tank detects the slurry temperature. If the slurry temperature does not reach the preset temperature or the preheating efficiency does not reach the preset requirement, the conductive slide rail of the electric heating rod is connected to the external power supply to start heating the electric heating rod;

[0021] Step 3: The exhaust gas after heat exchange through the hollow interlayer, the heat circulation pipe and the associated heating pipe is introduced into the exhaust gas return pipe. The temperature sensor on the exhaust gas return pipe detects the exhaust gas temperature. If the exhaust gas temperature is higher than the air temperature, it flows into the external air chamber through the No. 3 three-way solenoid valve for recycling. If the exhaust gas temperature is lower than the air temperature, it is discharged into the exhaust gas chimney through the No. 3 three-way solenoid valve.

[0022] Step 4: The exhaust gas flowing into the external air bin is filtered and heat-treated together with the air and then enters the spray granulation tower for spray granulation. The hot exhaust gas generated is circulated to repeat all the above steps.

[0023] Beneficial effects of the present invention:

[0024] (1) The control system of the centrifugal spray granulation of indium tin oxide slurry of the present invention recycles the hot exhaust gas generated in the spray granulation process in the indium tin oxide stirring process, so that the stirring blade and the inner wall of the stirring tank are heated and also serve as the source of heat for the semi-heated heating pipe. At the same time, the electric heating rod is used as auxiliary heat when the heat is insufficient, and the temperature is automatically adjusted according to the temperature sensor to keep the slurry within a certain temperature range, thereby ensuring the controllable uniformity of the temperature of the slurry, effectively controlling the temperature difference between the slurry and the spray tower, improving the product quality of the centrifugal spray granulation of indium tin oxide slurry, making the particle size distribution uniform, the particle shape regular, and reducing agglomeration and component segregation.

[0025] (2) The control system for centrifugal spray granulation of indium tin oxide slurry of the present invention can shorten the drying time, improve production efficiency, and enhance the processing capacity of the equipment by recycling the hot exhaust gas generated in the spray granulation process in the indium tin oxide stirring process; at the same time, it can reduce the thermal stress of the equipment, reduce equipment loss, reduce clogging and scaling problems, and extend the service life of the equipment; it is beneficial to improve the quality of products used for target sputtering, ensure the stability of sputtering rate, improve the uniformity of thin film, improve the electrical and optical properties of thin film, meet the needs of high-quality thin film preparation, and promote the application development in related fields.

[0026] (3) The control system for centrifugal spray granulation of indium tin oxide slurry of the present invention can recycle the hot tail gas generated during the spray granulation process in the indium tin oxide stirring process, thereby realizing the recycling of the tail gas, reducing costs and being more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 Schematic diagram of a control system for centrifugal spray granulation of indium tin oxide slurry in Example 1 of the present invention;

[0029] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the stirring tank in the control system of the centrifugal spray granulation of indium tin oxide slurry;

[0030] Figure 3 yes Figure 2 Schematic diagram of the internal structure of the stirring paddle in the stirring tank;

[0031] Figure 4 yes Figure 1 Schematic diagram of the communication connection of the control center in the control system of centrifugal spray granulation of indium tin oxide slurry.

[0032] In the figure: 100, slurry stirring device; 101, stirring tank; 102, motor; 103, stirring paddle; 104, heat circulation pipe; 105, electric heating rod; 106, external power supply; 107, slurry conveying pipeline; 200, centrifugal spray granulation device; 201, spray granulation tower; 202, high speed atomizer; 203, vibrating screen; 204, first waste powder tank; 205, first discharge valve; 206, air blower; 207, heater; 208, external air warehouse; 300, auxiliary tower; 301, tower body; 302, auxiliary Tower air inlet pipe; 303, auxiliary tower powder tank; 304, second unloading valve; 400, dust removal tower; 401, tower body; 402, dust removal tower air inlet pipe; 403, dust removal bag; 404, third unloading valve; 405, second waste powder tank; 500, exhaust fan; 600, No. 1 three-way solenoid valve; 601, gas branch one; 602, gas branch two; 700, No. 2 three-way solenoid valve; 701, gas branch three; 702, gas branch four; 800, associated heating pipe; 900, exhaust gas reflux pipe; 901, No. 3 three-way solenoid valve. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] See also Figure 1 This embodiment discloses a control system for centrifugal spray granulation of indium tin oxide slurry, including a slurry stirring device 100 and a centrifugal spray granulation device 200.

[0036] The slurry stirring device 100 includes a stirring tank 101. The shell of the stirring tank 101 is configured as a hollow sandwich structure. The hollow sandwich structure is provided with an air inlet and an air outlet for hot exhaust gas to enter and discharge. After the hot exhaust gas enters the hollow interlayer, the inner wall temperature of the stirring tank 101 can be increased, thereby increasing the temperature of the internal slurry. A temperature sensor is also installed on the inner wall of the stirring tank 101 to sense the real-time temperature of the slurry.

[0037] A stirring mechanism is provided in the stirring tank 101, and the stirring mechanism includes a motor 102 and a stirring paddle 103. The motor 102 is installed on the outer top of the stirring tank 101, and the stirring paddle 103 is arranged inside the stirring tank 101. The upper end of the stirring paddle 103 is connected to the output end of the motor 102. When the motor 102 is started, the stirring paddle 103 can be driven to rotate, thereby mixing and stirring the slurry in the stirring tank 101.

[0038] See also Figure 2-3 A heat circulation pipe 104 is also arranged inside the stirring paddle 103, wherein both ends of the heat circulation pipe 104 are respectively placed outside the stirring paddle 103, and the hot exhaust gas enters from one end, flows around the stirring paddle 103 and then is discharged from the other end. In this process, the hot exhaust gas can heat the stirring paddle 103, and then exchange heat with the slurry in the stirring tank 101. After the heat exchange, the temperature of the hot exhaust gas is reduced and discharged from the other end.

[0039] An electric heating rod 105 is also arranged inside the stirring paddle 103. One end of the electric heating rod 105 is connected to the external power supply 106 through a conductive slide rail. When the conductive slide rail is connected, the external power supply 106 supplies power and heats the electric heating rod 105, which can further increase the temperature of the stirring paddle 103 and thereby adjust the slurry temperature inside the stirring tank 101.

[0040] A slurry conveying pipe 107 is connected to the bottom of the stirring tank 101, and the other end of the slurry conveying pipe 107 is connected to the centrifugal spray granulation device 200, and a temperature sensor is installed on the slurry conveying pipe 107 to sense the slurry temperature inside the slurry conveying pipe 107; a feed pump is also installed on the slurry conveying pipe 107, and the slurry after stirring can be fed from the slurry conveying pipe 107 into the centrifugal spray granulation device 200 through the pumping action of the feed pump.

[0041] The centrifugal spray granulation device 200 includes a hot air supply mechanism, a spray granulation tower 201, a sub-tower 300 and a dust removal tower 400 which are sequentially connected and arranged. Next, each component will be introduced one by one.

[0042] The hot air supply mechanism includes an external air bin 208, a heater 207 and a blower 206 which are connected in sequence, and the gas outlet of the blower 206 is connected to the gas inlet of the spray granulation tower 201 through a gas pipeline; a coarse filter is also provided between the external air bin 208 and the heater 207, and a high-efficiency filter is provided between the blower 206 and the spray granulation tower 201; the air enters from the external air bin 208, is roughly filtered through the coarse filter, and then enters the heater 207 for heating; the heated gas is finely filtered through the high-efficiency filter, and then enters the spray granulation tower 201 as hot air to spray and granulate the slurry entering the spray granulation tower 201.

[0043] The top of the spray granulation tower 201 is connected to the slurry output end of the slurry conveying pipeline 107, and a high-speed atomizer 202 is also provided on the top of the spray granulation tower 201. After the slurry stirred in the stirring tank 101 is conveyed to the spray granulation tower 201 through the slurry conveying pipeline 107, it is first atomized at the top by the high-speed atomizer 202, and then forms powder particles under the action of hot air and falls downward under the action of gravity; the bottom of the spray granulation tower 201 is connected to a vibrating screen 203 through a powder conveying pipeline, and a first discharge valve 205 is installed on the powder conveying pipeline. The two sides of the vibrating screen 203 are respectively connected to a first waste powder tank 204 and a finished powder tank through pipelines; opening the first discharge valve 205 can allow the powder particles formed by the slurry to enter the vibrating screen 203, and under the vibrating action of the vibrating screen, the coarse material on the upper part of the screen is sent to the first waste powder tank 204, and the powder particles under the screen are transported to the finished powder tank.

[0044] The auxiliary tower 300 includes a tower body 301, the feed port of the tower body 301 is connected to the auxiliary tower air inlet pipe 302, and the input end of the auxiliary tower air inlet pipe 302 is connected to the spray granulation tower 201; the bottom of the tower body 301 is connected to the auxiliary tower powder tank 303 through a powder conveying pipeline, and the powder conveying pipeline is equipped with a second unloading valve 304; the auxiliary tower powder tank 303 is connected to the finished product powder tank through a pipeline; the hot exhaust gas coming out of the spray granulation tower 201 enters the tower body 301 through the auxiliary tower air inlet pipe 302, and a small amount of powder carried therein falls to the bottom of the tower body 301. Opening the second unloading valve 304 can allow the powder to enter the auxiliary tower powder tank and then be sent to the finished product powder tank 303.

[0045] The dust removal tower 400 includes a tower body 401, and a dust removal bag 403 is arranged on the top of the tower body 401; the air inlet of the tower body 401 is connected to the dust removal tower air inlet pipe 402, and the bottom of the tower body 401 is connected to the second waste powder tank 405 through a powder conveying pipeline, and a third unloading valve 404 is installed on the powder conveying pipeline; the hot exhaust gas discharged from the auxiliary tower 300 enters the tower body 401 through the dust removal tower air inlet pipe 402, and under the filtration of the dust removal bag 403, the powder in the hot exhaust gas falls to the bottom of the tower body 401, and opening the third unloading valve 404 can make the powder fall into the second waste powder tank 405. At the same time, the hot exhaust gas filtered by the dust removal bag 403 is discharged from the dust removal tower 400.

[0046] The above process realizes the whole process of slurry spray granulation. Next, the movement direction of the exhaust gas after being discharged from the dust removal tower 400 will be introduced.

[0047] An exhaust fan 500 is provided at the exhaust port of the dust removal tower 400, and a No. 1 three-way solenoid valve 600 is provided on the outlet pipe of the exhaust fan 500, and the other two connecting ends of the No. 1 three-way solenoid valve 600 are respectively connected to the gas branch pipe 1 601 and the gas branch pipe 2 602, wherein the other end of the gas branch pipe 2 602 is connected to the No. 2 three-way solenoid valve 700, and the other end of the gas branch pipe 1 601 is connected to the associated heating pipe 800, and the associated heating pipe 800 is arranged in parallel on one side of the slurry conveying pipeline 107; the other two connecting ends of the No. 2 three-way solenoid valve 700 are respectively connected to the gas branch pipe 3 701 and the gas branch pipe 4 702, wherein the other end of the gas branch pipe 3 701 is connected to the air inlet input port of the hollow interlayer of the stirring tank 101, and the gas branch pipe 3 701 is installed with a temperature sensor for sensing the temperature of the hot exhaust gas in the pipe; the other end of the gas branch pipe 4 702 is connected to the gas input port of the heat circulation pipe 104;

[0048] At the same time, the gas output end of the heat circulation pipe 104, the gas output port of the hollow interlayer and the gas output end of the associated heating pipe 800 are respectively connected to the exhaust gas return pipe 900 through gas pipelines, and variable pressure relief valves are installed on the gas pipelines of the three. The exhaust gas return pipe 900 is installed with a temperature sensor, and the output end is connected to a No. 3 three-way solenoid valve 901. The other two connection ends of the No. 3 three-way solenoid valve 901 are respectively connected to the external air chamber 208 and the exhaust gas chimney through gas pipelines.

[0049] See also Figure 4 The entire system is electronically controlled through a control center, and the control center is communicated with each temperature sensor, variable pressure relief valve, external power supply 106, No. 1 three-way solenoid valve 600, No. 2 three-way solenoid valve 700 and No. 3 three-way solenoid valve 901 in the system, thereby controlling the operation of the system.

[0050] Example 2

[0051] This embodiment discloses a control method for the control system of the centrifugal spray granulation of indium tin oxide slurry described in Example 1, comprising the following steps:

[0052] Step 1: The hot exhaust gas of the centrifugal spray granulation device 200 flows to the No. 2 three-way solenoid valve 700 and the associated heating pipe 800 through the No. 1 three-way solenoid valve 600, and the hot exhaust gas from the No. 2 three-way solenoid valve 700 flows to the hollow interlayer and the heat circulation pipe 104 for heating;

[0053] Specifically, the hot exhaust gas in the centrifugal spray granulation device 200 enters the No. 1 three-way solenoid valve 600 through the exhaust fan 500, and then enters the associated heating pipe 800 through the gas branch pipe 1 601 and enters the No. 2 three-way solenoid valve 700 through the gas branch pipe 2 602;

[0054] First, the valves connected between the No. 1 three-way solenoid valve 600 and the gas branch pipe 2 602 are opened, and at the same time, all valves of the No. 2 three-way solenoid valve 700 are opened. After the hot tail gas enters the No. 2 three-way solenoid valve 700 through the No. 1 three-way solenoid valve 600, it enters the hollow interlayer and the heat circulation pipe 104 through the gas branch pipe 3 701 and the gas branch pipe 4 702 respectively, thereby heating the stirring paddle 103 and the inner wall of the stirring tank 101, thereby increasing the slurry temperature;

[0055] When the mixing tank 101 starts to feed the material to the spray granulation tower 201 through the slurry conveying pipe 107, the control center commands the No. 1 three-way solenoid valve 600 to open the valve for supplying air to the gas branch pipe 601, so that the hot tail gas enters the associated heating pipe 800 through the gas branch pipe 601, thereby heating the slurry in the slurry conveying pipe 107 and setting the heating temperature. The temperature sensor on the slurry conveying pipe 107 senses the temperature in the pipe in real time and transmits the temperature information to the control center. The control center automatically adjusts the valve opening of the No. 1 three-way solenoid valve 600 for supplying air to the gas branch pipe 601 in real time according to the temperature information. If the slurry temperature drops, the hot tail gas flow rate is increased; if the temperature rises too quickly, the hot tail gas flow rate is reduced to ensure that the slurry temperature is always maintained within a smaller fluctuation range above and below the heating temperature during the feeding process to prevent the slurry cooling from affecting the subsequent spray granulation;

[0056] Step 2: The temperature sensor inside the stirring tank 101 detects the slurry temperature. If the slurry temperature does not reach the preset temperature or the preheating efficiency does not reach the preset requirement, the conductive slide rail of the electric heating rod 105 is connected to the external power supply 106, so that the electric heating rod 105 starts heating;

[0057] The temperature sensor in the stirring tank 101 monitors the slurry temperature in real time and transmits the temperature information to the control center, and controls the corresponding opening of the No. 1 three-way solenoid valve 600 or the No. 2 three-way solenoid valve 700 according to the temperature information, thereby adjusting the hot exhaust gas flow and controlling the temperature; when the opening of the three-way solenoid valve is adjusted to the maximum, that is, when the hot exhaust gas flow reaches the highest, if the temperature still does not reach the preset temperature, the control center commands the conductive slide rail on the electric heating rod 105 to be connected to the external power supply 106, so as to compensate for the heat and achieve the heating target. Through this method, the slurry can be guaranteed to be within a certain suitable temperature range.

[0058] Step 3: The exhaust gas after heat exchange through the hollow interlayer, the heat circulation pipe 104 and the associated heating pipe 800 is introduced into the exhaust gas return pipe 900. The temperature sensor on the exhaust gas return pipe 900 detects the exhaust gas temperature. If the exhaust gas temperature is higher than the air temperature, it flows into the external air chamber 208 through the No. 3 three-way solenoid valve 901 for recycling. If the exhaust gas temperature is lower than the air temperature, it is discharged to the exhaust gas chimney through the No. 3 three-way solenoid valve 901.

[0059] Step 4: The exhaust gas flowing into the external air chamber 208 is filtered and heat-treated together with the air and then enters the spray granulation tower 201 for spray granulation. The hot exhaust gas generated is circulated to repeat all the above steps.

[0060] When using an indium tin oxide slurry with a certain solid content and a certain viscosity, and the ambient temperature is a certain value, the heating temperature of the stirring paddle 103, the heating temperature of the inner wall of the stirring tank 101, and the heating temperature of the slurry delivery pipeline 107 are calculated according to a pre-established parameter model. During the production process, if the solid content, viscosity, and ambient temperature of the slurry change, these data are collected in real time and input into the control center. The control center recalculates the heating temperature of each component according to the adjustment algorithm, adjusts the parameters of the electromagnetic three-way valve, the controllable pressure relief valve and other equipment parameters, and ensures that the indium tin oxide slurry and the heating temperature of the centrifugal spray tower maintain a constant temperature difference to meet the production needs under different working conditions.

[0061] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0062] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A control system for centrifugal spray granulation of indium tin oxide slurry, comprising a slurry stirring device and a centrifugal spray granulation device, wherein the discharge end of the slurry stirring device is connected to the feed end of the centrifugal spray granulation device through a slurry conveying pipeline, and a feed pump is installed on the slurry conveying pipeline; characterized in that: The centrifugal spray granulation device comprises a stirring tank, a hollow interlayer is provided in the shell of the stirring tank, and a stirring mechanism is built in the stirring tank, and the stirring mechanism comprises a stirring paddle with a heat circulation tube arranged inside; The hot exhaust gas outlet of the centrifugal spray granulation device is connected to the gas input ports of the hollow interlayer, the heat circulation pipe and the associated heating pipe arranged on the outer wall of the slurry conveying pipe through gas pipelines; the air inlet of the centrifugal spray granulation device is provided with a hot air supply mechanism, the air inlet end of the hot air supply mechanism is connected to the exhaust gas reflux pipe, and the gas output ports of the hollow interlayer, the heat circulation pipe and the associated heating pipe are connected to the exhaust gas reflux pipe through gas pipelines.

2. The control system for centrifugal spray granulation of indium tin oxide slurry according to claim 1, characterized in that: An electric heating rod is also arranged in the stirring paddle, and a conductive slide rail is arranged at one end of the electric heating rod, and the conductive slide rail can be connected to an external power supply in a touch-type manner.

3. The control system for centrifugal spray granulation of indium tin oxide slurry according to claim 2, characterized in that: A No. 1 three-way solenoid valve is provided at the hot exhaust gas outlet of the centrifugal spray granulation device, and the other two connecting ends of the No. 1 three-way solenoid valve are respectively connected to gas pipelines, wherein the other end of one of the gas pipelines is connected to a No. 2 three-way solenoid valve, and the other end of the other gas pipeline is connected to an associated heating pipe; the other two connecting ends of the No. 2 three-way solenoid valve are respectively connected to the gas input ports of the hollow interlayer and the heat circulation pipe.

4. The control system for centrifugal spray granulation of indium tin oxide slurry according to claim 3, characterized in that: The centrifugal spray granulation device includes a hot air supply mechanism, a spray granulation tower, a sub-tower, a dust removal tower and an exhaust fan. The gas output port of the hot air supply mechanism is connected to the gas input port of the spray granulation tower through a gas pipeline, and the gas output port of the spray granulation tower is connected to the gas input port of the sub-tower through a gas pipeline; the gas output port of the sub-tower is connected to the gas input port of the dust removal tower through a gas pipeline, the gas output port of the dust removal tower is connected to the gas input port of the exhaust fan through a gas pipeline, and the gas output port of the exhaust fan is connected to a No. 1 three-way solenoid valve through a gas pipeline.

5. The control system for centrifugal spray granulation of indium tin oxide slurry according to claim 4, characterized in that: The hot air supply system includes an external air bin, a heater and a blower connected in sequence, the gas output port of the blower is connected to the gas input port of the spray granulation tower through a gas pipeline; a coarse-effect filter is also provided between the external air bin and the heater, and a high-efficiency filter is provided between the blower and the spray granulation tower.

6. The control system for centrifugal spray granulation of indium tin oxide slurry according to claim 5, characterized in that: A No. 3 three-way solenoid valve is installed at the gas output end of the exhaust gas return pipe, and the other two connecting ends of the No. 3 three-way solenoid valve are connected to the external air warehouse and the exhaust gas chimney through gas pipelines respectively.

7. The control system for centrifugal spray granulation of indium tin oxide slurry according to claim 6, characterized in that: Variable pressure relief valves are provided on the gas pipelines whose gas outlets of the hollow interlayer, the heat circulation pipe and the associated heating pipe are respectively connected to the tail gas reflux pipe.

8. The control system for centrifugal spray granulation of indium tin oxide slurry according to claim 7, characterized in that: Temperature sensors are installed inside the stirring tank, on the gas pipeline connecting the No. 2 three-way solenoid valve and the hollow interlayer, the associated heating pipe, and the tail gas reflux pipe.

9. The control system for centrifugal spray granulation of indium tin oxide slurry according to claim 8, characterized in that: The control system includes a control center, and the No. 1 three-way solenoid valve, No. 2 three-way solenoid valve, No. 3 three-way solenoid valve, feed pump, external power supply, all variable pressure relief valves and all temperature sensors are communicatively connected to the control center.

10. A control method for a control system for centrifugal spray granulation of indium tin oxide slurry according to any one of claim 9, characterized in that: The steps include: Step 1: The hot tail gas of the centrifugal spray granulation device flows to the No. 2 three-way solenoid valve and the associated heating pipe through the No. 1 three-way solenoid valve, and the hot tail gas from the No. 2 three-way solenoid valve flows to the hollow interlayer and the heat circulation pipe for heating; Step 2: The temperature sensor inside the stirring tank detects the slurry temperature. If the slurry temperature does not reach the preset temperature or the preheating efficiency does not reach the preset requirement, the conductive slide rail of the electric heating rod is connected to the external power supply to start heating the electric heating rod; Step 3: The exhaust gas after heat exchange through the hollow interlayer, the heat circulation pipe and the associated heating pipe is introduced into the exhaust gas return pipe. The temperature sensor on the exhaust gas return pipe detects the exhaust gas temperature. If the exhaust gas temperature is higher than the air temperature, it flows into the external air chamber through the No. 3 three-way solenoid valve for recycling. If the exhaust gas temperature is lower than the air temperature, it is discharged into the exhaust gas chimney through the No. 3 three-way solenoid valve. Step 4: The exhaust gas flowing into the external air bin is filtered and heat-treated together with the air and then enters the spray granulation tower for spray granulation. The hot exhaust gas generated is circulated to repeat all the above steps.

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