Attachment state controlled spray dryer and control method

Abstract

The invention discloses an attachment state controlled spray dryer and a control method, a test part comprises a base which is movably and telescopically mounted on a drying barrel, the base is in a vertical plane and is parallel to the inner wall of a lower barrel, and a laser part and a light intensity part are correspondingly arranged at the inner end of the length of the base at an angle; according to the spray dryer for attachment state control and the control method, when the base extends inwards, the laser part scans the inner wall of the lower barrel in parallel, the thicknesses of attached materials on the inner wall of the lower barrel with different heights are detected step by step, and after detection is completed, the testing part is transferred out of the drying barrel to avoid interference of the testing part on stability of a flow field in the drying barrel; according to the dryer, the first heating body and the second heating body can heat the separator and the drying barrel while heating the airflow, instability caused by heat dissipation during work of the separator and the drying barrel is effectively reduced, heating of the first heating body and heating of the second heating body can be matched, and the work stability of the whole dryer is improved.

Description

Technical Field

[0001] The present invention relates to the field of spray dryers, and particularly to a spray dryer with attachment state control and a control method. Background Art

[0002] In the prior art, a spray dryer is a very important device that mainly utilizes spray technology to effectively convert various liquid materials into dry powder form. During operation, the spray dryer atomizes the liquid material by using a high-pressure nozzle to form fine droplets. The fine droplets will then rapidly evaporate the moisture therein under the action of hot air flow, and finally obtain dry solid particles. Due to its efficient and convenient drying ability, this device has been widely used in many fields such as the food industry, chemical industry, and pharmaceutical industry. It can handle various types of liquid materials, including but not limited to emulsions, solutions, and suspensions, etc., providing great convenience and efficiency improvement for these industries.

[0003] Currently, the monitoring methods for the working state of the spray dryer mainly include temperature monitoring, pressure monitoring, flow monitoring, particle size analysis, and humidity monitoring. Temperature monitoring detects the temperatures of different parts inside the dryer to ensure that the material is dried at the correct temperature and avoid overheating or insufficient temperature. Pressure monitoring monitors the pressure changes inside the dryer to ensure the stability and efficiency of the spray drying process. Flow monitoring measures the liquid flow rate and gas flow rate entering the dryer to ensure that their ratio is appropriate. Particle size analysis analyzes the particle size distribution of the dried product to ensure that the product quality meets the requirements. And the relatively important humidity monitoring detects the humidity of the gas at the outlet to ensure the drying effect. There are great difficulties in real-time humidity monitoring and it is easy to generate errors. The humidity of the drying air flow can largely reflect the spray drying effect. During the working process, powders with poor drying effect or adsorbed by static electricity often adhere to the inner wall of the drying barrel. The above attachment situations are both unfavorable for the drying effect of the spray dryer and the cleaning process after use. Summary of the Invention

[0004] The main object of the present invention is to provide a spray dryer with attachment state control and a control method, aiming to solve the problem that powders with poor drying effect or adsorbed by static electricity often adhere to the inner wall of the drying barrel and cannot be monitored and processed.

[0005] To achieve the above object, the present invention provides a spray dryer with particle state monitoring, including:

[0006] A drying barrel, including an upper barrel and a funnel-shaped lower barrel connected to each other, and having a first air duct led out;

[0007] A cyclone separator, connected to the drying barrel through the first air duct and having a second air duct led out;

[0008] The testing unit includes a base that is telescopically and removably installed on the base of the drying barrel. The base is in a vertical plane and parallel to the inner wall of the lower barrel. A laser unit and a light intensity unit are correspondingly arranged at an angle on the inner end of the length of the base. When the base extends inward, the laser unit scans the inner wall of the lower barrel in parallel.

[0009] The hot air unit includes an air supply pipe, a first heater including a first housing and a first heating element, and a second heater including a second housing and a second heating element. The first heating element is wound around the outer periphery of the separator and enclosed by the first housing. The second heating element is wound around the outer periphery of the lower barrel and enclosed by the second housing. The air supply pipe leads into the first housing, then to the second housing, and then back to the drying barrel.

[0010] A processor controls the testing unit, the first heating element, and the second heating element.

[0011] Further, the output end of the spray dryer is connected to the starting end of the air supply pipe. Both the first housing and the second housing are funnel-shaped. There is a gap between the first housing and the first heating element in the thickness direction, and there is a gap between the second housing and the second heating element in the thickness direction. Among them, the air supply pipe is introduced from top to bottom and tangentially arranged on both the first housing and the second housing.

[0012] Further, a cleaning brush is fixedly arranged on the drying barrel corresponding to the base. Among them, when the laser unit and the light intensity unit pass through the position of the cleaning brush, they are cleaned.

[0013] Further, the testing unit is installed on the upper barrel and extends downward into the lower barrel.

[0014] Further, the number of the testing units is multiple, and they are arranged at intervals in the circumferential direction of the drying barrel.

[0015] Further, a plurality of pneumatic hammers are provided on the outer wall of the lower barrel.

[0016] Further, the driving of the base is completed by a pneumatic push rod.

[0017] The present invention also provides a control method applied to the spray dryer for the above-mentioned adhesion state control, including:

[0018] S1. Receive the target drying temperature, set the operating temperature of the first heating element to be 30 to 100 degrees Celsius higher than the target drying temperature, and set the operating temperature of the second heating element to be the target drying temperature;

[0019] S2. Control the test part to extend into the drying barrel according to a preset time interval. After turning on the laser part and the light intensity part and receiving the height / light intensity test data received by the light intensity part at different heights, control the test part to retract.

[0020] S3. Calculate the thickness of the adhesion layer at different height positions according to the height / light intensity test data.

[0021] Further, after the step of S3 includes:

[0022] If the thickness of the adhesion layer at different height positions is abnormal, send a warning signal.

[0023] Further, a plurality of pneumatic hammers are arranged on the outer wall of the lower barrel. After the step of S3 includes:

[0024] Control the operating temperature of the second heating body to increase by 5 to 10 degrees Celsius, and start or strengthen the operation of a plurality of the pneumatic hammers.

[0025] For the spray dryer and control method for controlling the adhesion state provided by the present invention, when the base extends inward, the laser part scans the inner wall of the lower barrel in parallel, gradually detecting the thickness of the adhered material on the inner wall of the lower barrel at different heights. After the detection is completed, the test part is transferred out of the drying barrel to avoid interfering with the stability of the internal flow field of the drying barrel; while the first heating body and the second heating body heat the air flow, they can also heat the separator and the drying barrel respectively, effectively reducing the instability caused by heat dissipation in the operation of the separator and the drying barrel. The heating of the first heating body and the second heating body can be coordinated, improving the working stability of the entire dryer. Brief Description of the Drawings

[0026] Figure 1 is a schematic diagram of a spray dryer for controlling the adhesion state according to an embodiment of the present invention (the first perspective);

[0027] Figure 2 is a schematic diagram of a spray dryer for controlling the adhesion state according to an embodiment of the present invention (the second perspective);

[0028] Figure 3 is a cross-sectional schematic diagram of the position of the drying barrel in a spray dryer for controlling the adhesion state according to an embodiment of the present invention (the test part is in the retracted state)

[0029] Figure 4 is a cross-sectional schematic diagram of the position of the drying barrel in a spray dryer for controlling the adhesion state according to an embodiment of the present invention (the test part is in the extended state).

[0030] The realization, functional features, and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Embodiments

[0031] It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0032] Those skilled in the art of the present technology can understand that unless specifically stated otherwise, the singular forms "a", "an", "the", "above-mentioned", and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present invention means that there are the described features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or their groups. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more related listed items.

[0033] Those skilled in the art of the present technology can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention pertains. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0034] Referring to Figures 1 to 4 , in an embodiment of the present invention, a spray dryer with particle state monitoring includes:

[0035] A drying barrel 100, including an upper barrel 110 and a funnel-shaped lower barrel 120 connected to each other, and a first air duct 130 is led out;

[0036] A cyclone separator 200, connected to the drying barrel 100 through the first air duct 130 and a second air duct 210 is led out;

[0037] A testing unit 300, including a base 310 that is telescopically installed in the drying barrel 100 and can be removed. The base 310 is in a vertical plane and parallel to the inner wall of the lower barrel 120. A laser unit 320 and a light intensity unit 330 are correspondingly arranged at an angle on the inner end of the length of the base 310. When the base 310 extends inward, the laser unit 320 scans the inner wall of the lower barrel 120 in parallel;

[0038] The hot air unit 400 includes an air supply pipe 410, a first heater including a first shell 421 and a first heating body, and a second heater including a second shell 431 and a second heating body 432, wherein the first heating body is wound around the outer periphery of the separator 200 and is enclosed by the first shell 421, the second heating body 432 is wound around the outer periphery of the lower barrel 120 and is enclosed by the second shell 431, and the air supply pipe 410 is conducted into the first shell 421, then conducted to the second shell 431, and then conducted back to the drying barrel 100;

[0039] The processor controls the testing unit 300 , the first heating body and the second heating body 432 .

[0040] In the prior art, real-time humidity monitoring is difficult and prone to errors. The humidity of the drying airflow can largely reflect the effect of spray drying. During operation, powders with poor drying effect or adsorbed by electrostatic effect are often attached to the inner wall of the drying barrel. The above attachment is not good for the drying effect of the spray dryer and the cleaning process after use.

[0041] In the spray dryer with adhesion state control provided by the present invention, the drying barrel 100 includes an upper barrel 110 and a funnel-shaped lower barrel 120 connected to each other, and the shape of the above drying barrel 100 is a common shape in the current prior art. The drying barrel 100 is connected to the external atomization part and the bottom is connected to the external material barrel. The atomization part continuously receives the input slurry to complete the atomization process. During the operation, the inner wall of the lower barrel 120 is often attached with powders with poor drying effect or electrostatic adsorption. The above adhesion conditions are not good for the drying effect of the spray dryer and the cleaning process after use. The drying barrel 100 is led out with a first air duct 130, and the specific position of the first air duct 130 is determined according to the design idea of ​​the spray dryer. In the drying barrel 100, the material droplets are dried by contact with the dry air, and the dry materials with smaller particles are led out of the first air duct 130, and the dry materials with smaller particles can be collected at the bottom of the drying barrel 100.

[0042] The cyclone separator 200 is connected to the drying barrel 100 through the first air passage 130 and leads to the second air passage 210. The material particles in the separator 200 collide with the inner wall under the centrifugal effect, stall and are collected. Although the diameter of the material particles in the separator 200 is small and the drying degree is good, there is a certain amount of high-temperature water vapor in the air flow led out from the first air passage 130, and the drying degree of the material particles in the separator 200 is easily reduced.

[0043] The testing unit 300 includes a base 310 that is telescopically and removably mounted on the drying barrel 100. The installation position of the testing unit 300 can be above or below the lower barrel 120, but the testing unit 300 needs to be removable from the drying barrel 100 to avoid interfering with the airflow field inside the drying barrel 100. The base 310 is in a vertical plane and parallel to the inner wall of the lower barrel 120. The base 310 moves in a vertical plane, and the direction of its movement is parallel to the inner wall of the lower barrel 120 (i.e., when moving, the base 310 does not produce displacement on the lower barrel 120 at all). At an angle and correspondingly, a laser unit 320 and a light intensity unit 330 are provided at the inner end of the length of the base 310. The laser emitted by the laser unit 320 is received by the light intensity unit 330 after being reflected by the inner wall of the lower barrel 120. The thickness of the material adhered to the inner wall of the lower barrel 120 has a direct impact on the test intensity data of the light intensity unit 330. Finally, through the test light intensity data of the light intensity unit 330 and combined with the material properties of the material (such as the absorption characteristics and scattering characteristics of the laser), the thickness of the material adhered to the inner wall can be calculated. When the base 310 extends inward, the laser unit 320 scans the inner wall of the lower barrel 120. When the base 310 extends inward, the laser unit 320 scans the inner wall of the lower barrel 120 in parallel, and during the above scanning process, the laser unit 320 and the light intensity unit 330 can gradually detect the thickness of the adhered material on the inner wall of the lower barrel 120 at different heights. During the detection process, the testing unit 300 extends into the drying barrel 100 to detect the inner wall of the lower barrel 120 at different heights; when the detection is completed, the testing unit 300 is transferred out of the drying barrel 100 to avoid interfering with the stability of the airflow field inside the drying barrel 100. The driving method of the base 310 can be pneumatic driving, hydraulic driving, motor driving, etc.

[0044] The hot air section 400 includes an air supply duct 410, a first heater, and a second heating element 432. The first heater includes a first housing 421 and a first heating element. The second heating element 432 includes a second housing 431 and a second heating element 432. The first heating element is wound around the outer periphery of the separator 200 and is enclosed by the first housing 421. The second heating element 432 is wound around the outer periphery of the lower barrel 120 and is enclosed by the second housing 431. While heating the air flow, the first heating element and the second heating element 432 can also heat the separator 200 and the drying barrel 100 respectively, effectively reducing the instability of the operation of the separator 200 and the drying barrel 100 caused by heat dissipation. In particular, the effective heating effect of the first heating element and the second heating element 432 can reduce the adhesion force of the material on the container wall, facilitating the drying operation. Taking the first heating element as an example, the first heating element and the drying barrel 100 and the first housing 421 can have a gap in the thickness direction, or can be closely arranged, specifically considering the convenience of overall design and the use effect. The heating types of the first heating element and the second heating element 432 can be resistance wires or infrared rays, etc., which are not specifically limited. The air supply duct 410 leads into the first housing 421, then leads to the second housing 431, and then leads back to the drying barrel 100. Thus, the air supply duct 410 can introduce the heated air flow to complete the drying function. In particular, the heating of the first heating element and the second heating element 432 can be coordinated to provide conditions for the stable operation of the entire dryer. For example, during the operation, if the target temperature of the drying air flow is 200 degrees Celsius, the set temperature of the first heating element can be relatively high, such as 300 degrees Celsius, to quickly heat the air flow, while the set temperature of the second heating element 432 can be directly the target temperature. At this time, the air flow entering the second housing 431 from the air supply duct 410 can exchange heat with the second heating element 432, so that the output end of the air supply duct 410 can provide a drying air flow with a stable temperature. When the test results in the test section 300 show an increase in the thickness of the adhesion layer, the operating temperatures of the first heating element and the second heating element 432 can be controlled, especially the heating temperature of the second heating element 432, to increase the drying intensity.

[0045] The processor controls the test section 300, the first heating element, and the second heating element 432. The processor controls the extension and retraction processes of the test section 300 during the test. The processor controls the turning on and off of the heating of the first heating element and the second heating element 432, and can also perform the setting of the operating temperature. The specific control method of the processor can be completed through a preset program in a single-chip microcomputer, or through real-time detection and control by corresponding sensors, or a combination of the two control methods.

[0046] In summary, when the base 310 extends inward, the laser unit 320 scans the inner wall of the lower barrel 120 in parallel, gradually detecting the thickness of the adhering material on the inner wall of the lower barrel 120 at different heights. After the detection is completed, the test unit 300 is transferred out of the drying barrel 100 to avoid interfering with the stability of the internal flow field of the drying barrel 100. While heating the air flow, the first heating element and the second heating element 432 can also heat the separator 200 and the drying barrel 100 respectively, effectively reducing the instability of the operation of the separator 200 and the drying barrel 100 caused by heat dissipation. The heating of the first heating element and the second heating element 432 can be coordinated, improving the working stability of the entire dryer.

[0047] Referring to Figures 1 to 2 , in one embodiment, the output end of the spray dryer is connected to the starting end of the air supply pipe 410. Both the first housing 421 and the second housing 431 are funnel-shaped. A gap is provided between the first housing 421 and the first heating element in the thickness direction, and a gap is provided between the second housing 431 and the second heating element 432 in the thickness direction. Among them, the air supply pipe 410 is introduced from top to bottom and tangentially arranged on both the first housing 421 and the second housing 431.

[0048] In this embodiment, since the output end of the spray dryer is connected to the starting end of the air supply pipe 410, the dried air flow output by the spray dryer is recycled. Although the dried air flow output from the output end of the spray dryer has undergone a dust removal process, it still has certain particles. A plurality of filters can be provided at appropriate positions on the air supply pipe 410, but the preferred position is downstream of the first housing 421 and the second housing 431. The number of fans provided on the air supply pipe 410 is not limited to one, and preferably a fan is provided at the inlet position of the drying barrel 100 to ensure the wind speed of the dried air flow entering the drying barrel 100. The structures of the first housing 421 and the second housing 431 are designed. Specifically, a gap is provided between the first housing 421 and the first heating element in the thickness direction, a gap is provided between the second housing 431 and the second heating element 432 in the thickness direction, and the air supply pipe 410 is designed to be introduced from top to bottom on both the first housing 421 and the second housing 431, so that the air flow environment in the first housing 421 and the second housing 431 simulates a cyclone separator. The shapes of the first heating element and the second heating element 432 are preferably spiral, so as to form a certain air guiding effect, improving the heating uniformity and providing a basis for the separation of particles. Powder discharge ports can be provided at the bottoms of the first housing 421 and the second housing 431 as the collection positions for impurity particles. It should be noted that in addition to the particles separated from the air flow, the particle impurities accumulated on the first heating element and the second heating element 432 are also collected by the first housing 421 and the second housing 431 respectively under the action of the cyclone.

[0049] In one embodiment, a cleaning brush is fixedly arranged on the drying barrel 100 corresponding to the base 310. When the laser part 320 and the light intensity part 330 pass through the position of the cleaning brush, they are cleaned.

[0050] In this embodiment, through the movement process of the base 310 itself, it forms an intersection with the cleaning brush. Then, the laser part 320 and the light intensity part 330 can be cleaned, thus ensuring the normal operation of the laser part 320 and the light intensity part 330, and the test result accuracy is higher. For example, the cleaning brush is a brush structure or a rubber block structure fixed on the circumferential wall of the drying barrel 100 at the position corresponding to the base 310, so that the cleaning brush cleans the laser part 320 and the light intensity part 330 passing through its position.

[0051] Refer to Figures 3 to 4 In one embodiment, the testing part 300 is installed on the upper barrel 110, and the testing part 300 extends downward into the lower barrel 120.

[0052] In this embodiment, the installation position of the testing part 300 is given. The position space at the upper barrel 110 is relatively large and the overall ground clearance distance of the drying barrel 100 is prevented from being too high.

[0053] In one embodiment, the number of the testing parts 300 is multiple, and they are arranged at intervals in the circumferential direction of the drying barrel 100.

[0054] In this embodiment, by increasing the number of the testing parts 300, the sticking wall states at multiple positions in the circumferential direction of the drying barrel 100 can be monitored. For example, the number of the testing parts 300 is four, and they are evenly spaced at 90 degrees in the circumferential direction of the drying barrel 100. The driving of the base 310 can be conveniently realized by a pneumatic push rod without over-complicating the overall structure.

[0055] In one embodiment, the lower barrel 120 includes a plurality of flat plates connected to each other in the circumferential direction.

[0056] In this embodiment, the lower barrel 120 is arranged as a polygonal structure in the circumferential direction instead of a circular smooth structure, so that the laser generated by the laser part 320 can be efficiently reflected, providing a basis for the accurate operation of the light intensity part 330. Specifically, the more the number of flat plates included in the lower barrel 120, the more stable the air flow state in the drying barrel 100. The flat plates can be an integral structure or a welded structure with each other.

[0057] In one embodiment, a plurality of pneumatic hammers are arranged on the outer wall of the lower barrel 120 in the circumferential direction.

[0058] In this embodiment, the air hammer can be used to adjust the airflow in the drying barrel 100. Meanwhile, the powder on the inner wall of the lower barrel 120 can be purged by the operation of multiple air hammers, providing a basis for the normal operation of the drying barrel 100.

[0059] Referring to Figures 3 to 4 , in one embodiment, the driving of the base 310 is completed by a pneumatic push rod.

[0060] In the foregoing embodiment, the driving mode of the telescopic base 310 is not limited, and the power can be pneumatic drive, hydraulic drive, motor drive, etc. In this embodiment, the driving of the base 310 is limited to be completed by a pneumatic push rod. Since compressed air circuits are provided in most workshop environments, it is convenient to drive in a pneumatic manner.

[0061] The present invention also provides a control method, which is applied to the spray dryer for controlling the adhesion state as described above, and includes:

[0062] S1. Receive the target drying temperature, set the working temperature of the first heating element to be 30 to 100 degrees Celsius higher than the target drying temperature, and set the working temperature of the second heating element 432 to the target drying temperature;

[0063] S2. Control the test part 300 to extend into the drying barrel 100 according to a preset time interval. After turning on the laser part 320 and the light intensity part 330 and receiving the height / light intensity test data received by the light intensity part 330 at different heights, control the test part 300 to retract;

[0064] S3. Calculate the thickness of the adhesion layer at different height positions according to the height / light intensity test data.

[0065] In this embodiment, in step S1, the target drying temperature is received, the operating temperature of the first heating element is set to be 30 to 100 degrees Celsius higher than the target drying temperature, and the operating temperature of the second heating element 432 is set to the target drying temperature. The heating of the first heating element and the second heating element 432 can be coordinated to provide conditions for the stable operation of the entire dryer. For example, during operation, if the target temperature of the drying air flow is 200 degrees Celsius, the set temperature of the first heating element can be relatively high, such as 300 degrees Celsius, to quickly heat the air flow, while the set temperature of the second heating element 432 can be directly the target temperature. At this time, the air flow entering the second housing 431 from the air supply pipe 410 can exchange heat with the second heating element 432, so that the output end of the air supply pipe 410 can provide a drying air flow with a stable temperature. The first heating element and the second heating element 432 can not only heat the air flow, but also heat the separator 200 and the drying barrel 100 respectively, providing a basis for the temperature environment in the separator 200 and the drying barrel 100 when providing a drying air flow with a stable temperature. In particular, the operating temperature of the second heating element 432 is close to the operating temperature in the drying barrel 100, and the second heating element 432 will not have a negative impact on the temperature field in the drying barrel 100 during the heating process.

[0066] In steps S2 and S3, the laser unit 320 and the light intensity unit 330 are arranged at an angle and correspondingly, and can perform the functions of laser emission and reception. The laser emitted by the laser unit 320 is reflected by the inner wall of the lower barrel 120 and received by the light intensity unit 330. The thickness of the material attached to the inner wall of the lower barrel 120 has a direct impact on the test intensity data of the light intensity unit 330. Finally, through the test light intensity data of the light intensity unit 330 and combined with the material physical properties of the material (such as the absorption characteristics and scattering characteristics of the laser), the thickness of the material attached to the inner wall can be calculated. When the base 310 extends inward, the laser unit 320 scans the inner wall of the lower barrel 120. When the base 310 extends inward, the laser unit 320 scans the inner wall of the lower barrel 120 in parallel, and during the above scanning process, the laser unit 320 and the light intensity unit 330 can gradually detect the thickness of the material attached to the inner wall of the lower barrel 120 at different heights. During the detection process, the test unit 300 extends into the drying barrel 100 to detect the inner wall of the lower barrel 120 at different heights; after the detection is completed, the test unit 300 is transferred out of the drying barrel 100 to avoid interfering with the stability of the flow field in the drying barrel 100. The driving method of the base 310 can be pneumatic driving, hydraulic driving, motor driving, etc.

[0067] In one embodiment, after step S3, it includes:

[0068] If the thickness of the attachment layer at different height positions is abnormal, a warning signal is sent.

[0069] In this embodiment, there are various situations where the thickness of the adhesion layer is abnormal. A typical judgment rule is that if the thickness of the adhesion layer is too thick at a certain proportion of height positions, it indicates that the drying effect is not good and adjustment is needed. At this time, a warning signal is sent. After receiving the warning signal, the operator can increase the working temperature of the second heating element 432, or the processor directly increases the working temperature of the second heating element 432 according to the warning signal. The increase in the working temperature of the second heating element 432 is uniform and stable, and it provides two effects. The second heating element 432 directly heats the lower barrel 120, so that the existing adhesion layer is dried and then detached. At the same time, the increase in the temperature of the second heating element 432 can improve the heating effect of the drying air flow. For the situation where the thickness of the adhesion layer is too thick, in addition to increasing the temperature of the heater, the air supply speed can also be increased.

[0070] In one embodiment, a plurality of pneumatic hammers are provided on the outer wall of the lower barrel 120 in a circumferential manner. After the step S3, it includes:

[0071] Control the working temperature of the second heating element 432 to increase by 5 to 10 degrees Celsius, and start or strengthen the work of a plurality of the pneumatic hammers.

[0072] In this embodiment, if the thickness of the adhesion layer is abnormal, it indicates that the drying effect is not good and adjustment is needed. The processor directly increases the working temperature of the second heating element 432 according to the warning signal and controls the work of the pneumatic hammers, thereby providing conditions for the treatment of the adhered material. The second heating element 432 directly heats the lower barrel 120, so that the existing adhesion layer is dried and then detached. At the same time, the increase in the temperature of the second heating element 432 can improve the heating effect of the drying air flow. Finally, the work of the pneumatic hammers is assisted to improve the efficiency of desorbing the material, and it is driven by the air flow. After the above steps are completed, steps S2 and S3 can be executed again.

[0073] For the spray dryer and control method for controlling the adhesion state provided by the present invention, when the base 310 extends inward, the laser part 320 scans the inner wall of the lower barrel 120 in parallel, and gradually detects the thickness of the adhered material on the inner wall of the lower barrel 120 at different heights. After the detection is completed, the test part 300 is transferred out of the drying barrel 100 to avoid interfering with the stability of the internal flow field of the drying barrel 100; while the first heating element and the second heating element 432 heat the air flow, they can also heat the separator 200 and the drying barrel 100 respectively, effectively reducing the instability of the work of the separator 200 and the drying barrel 100 due to heat dissipation. The heating of the first heating element and the second heating element 432 can be coordinated, and the working stability of the entire dryer is improved.

[0074] The above are only the preferred embodiments of the present invention, and do not thereby limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A spray dryer with adhesion state control, characterized in that: include: The drying barrel comprises an upper barrel and a funnel-shaped lower barrel which are connected to each other and have a first air passage; A cyclone type separator, connected to the drying barrel through the first air passage and leading to a second air passage; The testing part comprises a base which is removably and telescopically mounted on the drying barrel, the base is in a vertical plane and parallel to the inner wall of the lower barrel, and a laser part and a light intensity part are arranged at an angle and correspondingly on the inner end of the length of the base, and when the base is extended inward, the laser part scans the inner wall of the lower barrel in parallel; The hot air part includes an air supply pipe, a first heater including a first shell and a first heating body, and a second heater including a second shell and a second heating body, wherein the first heating body is wound around the outer periphery of the separator and is closed by the first shell, the second heating body is wound around the outer periphery of the lower barrel and is closed by the second shell, and the air supply pipe is conducted into the first shell, then conducted to the second shell, and then conducted back to the drying barrel; A processor controls the testing unit, the first heating body, and the second heating body.

2. The adhesion state controlled spray dryer according to claim 1, characterized in that: The output end of the spray dryer is connected to the starting end of the air supply pipe, the first shell and the second shell are both funnel-shaped, a gap is provided in the thickness direction between the first shell and the first heating body, and a gap is provided in the thickness direction between the second shell and the second heating body, wherein the air supply pipe is introduced from top to bottom and discharged from bottom on the first shell and the second shell, and is arranged tangentially.

3. The adhesion state controlled spray dryer according to claim 1, characterized in that: A cleaning brush is fixedly arranged on the drying barrel corresponding to the base, wherein the laser part and the light intensity part are cleaned when they pass through the position of the cleaning brush.

4. The adhesion state controlled spray dryer according to claim 1, characterized in that: The testing part is installed on the upper barrel, and the testing part extends into the lower barrel from top to bottom.

5. The adhesion state controlled spray dryer according to claim 1, characterized in that: There are multiple test parts, which are spaced apart in the circumferential direction of the drying barrel.

6. The adhesion state controlled spray dryer according to claim 1, characterized in that: A plurality of air hammers are arranged on the outer wall of the lower barrel.

7. The adhesion state controlled spray dryer according to claim 1, characterized in that: The base is driven by a pneumatic push rod.

8. A control method, applied to the spray dryer with adhesion state control according to claim 1, characterized in that: include: S1. Receive a target drying temperature, set the working temperature of the first heating body to be 30 to 100 degrees Celsius higher than the target drying temperature, and set the working temperature of the second heating body to be the target drying temperature; S2, controlling the testing part to extend into the drying barrel according to a preset time interval, turning on the laser part and the light intensity part, and receiving the height / light intensity test data received by the light intensity part at different heights, and then controlling the testing part to retract; S3. Calculate the thickness of the adhesion layer at different height positions according to the height / light intensity test data.

9. The control method according to claim 8, characterized in that: The step of S3 then includes: If the thickness of the adhesion layer at different height positions is abnormal, a warning signal is sent.

10. The control method according to claim 8, characterized in that: The outer wall of the lower barrel is provided with a plurality of air hammers, and the step S3 includes: The working temperature of the second heating body is controlled to increase by 5 to 10 degrees Celsius, and the operation of the multiple air hammers is started or strengthened.

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