CN112229146A - Drying control method, system and equipment for microwave drying, simulation optimization and application - Google Patents
Drying control method, system and equipment for microwave drying, simulation optimization and application Download PDFInfo
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- CN112229146A CN112229146A CN202011126948.3A CN202011126948A CN112229146A CN 112229146 A CN112229146 A CN 112229146A CN 202011126948 A CN202011126948 A CN 202011126948A CN 112229146 A CN112229146 A CN 112229146A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
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Abstract
The invention belongs to the technical field of microwave drying, and discloses a drying control method, a system, equipment, simulation optimization and application of microwave drying.A sensing module consisting of eight sensors is used for monitoring and feeding back operation in time to ensure the caching, entering and delivery of a truck; a dehumidifier in the dehumidification module performs dehumidification operation on goods to be dried; according to the set requirement, when the number of trucks in the drying chamber meets the requirement, the isolation doors on two sides of the drying area are closed to dry the materials; the cooling module cools the goods by controlling the fan. The PLC-based touch control system is connected with the whole process module, and all the modules are in manual and automatic modes, so that the whole operation process is ensured to be orderly carried out. The method adopts COMSOL Multiphysics software to carry out dynamic numerical simulation on the temperature and the water content in the material drying process, optimizes the drying process through simulation and improves the drying efficiency.
Description
Technical Field
The invention belongs to the technical field of microwave drying, and particularly relates to a drying control method, a drying control system, drying control equipment, simulation optimization and application of microwave drying.
Background
At present: the coating of the water paint is divided into machine spraying and manual spraying: the machine spraying is more mature in the market at present, such as a reciprocating machine, a five-axis machine, a spraying machine, a vacuum spraying machine and the like, the equipment investment cost is higher, and a certain output support is required; still another is manual spraying. The traditional spray gun and the diaphragm pump are not needed to be changed in spraying, so that the cost is saved, but the smoothness of the spray gun is poor. The traditional spray gun is provided with an oil supply pressure barrel, oil is conveyed out of the spray gun under pressure, air pressure is reduced appropriately, and rebound of the oil is reduced. The paint cost is saved, and the equipment investment is small. The high-pressure gun matched with the Kemlin high-pressure pump has good paint film atomization, high paint utilization rate and increased cost. Since the coating smoothness is poor due to the high viscosity of the aqueous paint, it is recommended to add a pressure tank or use a Crmlin spray gun (mixed gas spraying).
The water paint is an environment-friendly pollution-free coating taking water as a medium, and how to improve the drying time of water paint furniture and keep the quality of a coated plate is a great problem in the production and processing of the water paint furniture.
At present, the domestic water paint coating industry is rising, the traditional drying mode is not enough to meet the domestic market demand and the environmental protection requirement as background, the microwave makes polar water molecules in the water paint move and rub with each other by means of high-frequency electromagnetic oscillation to generate heat, the water paint drying device is a heating mode with a good application prospect, and has the advantages of being fast in heating and strong in penetration, so that the drying efficiency of water paint coating materials can be improved, and the industrial efficiency is improved. Statistically, the united states consumes furniture $ 236 per year, german consumes furniture $ 371 per year, and japanese consumes furniture $ 255 per year, while our country is around $ 12, which is only 5% of developed countries such as europe and america. Especially, the furniture occupancy rate of the two-line and three-line market and the vast rural market is lower. Chinese people really buy less than 4 hundred million sets of furniture and sit on sofas, which means that 2/3 people have not used the current generation of furniture. This brings huge opportunity for further development of the furniture industry, and also makes the coating industry have huge prospects. Volatile Organic Compounds (VOC) of the paint contain benzene, ester, aldehyde and the like, which are serious in harm to human bodies, and excessive inhalation can cause symptoms such as dizziness, chest distress, cough and the like, and even can cause diseases such as pleuritis, cancer, leukemia and the like. Numbers published from the national environmental monitoring center show that as many as 11 million people die of poisoning that occur each year from paint exposure, averaging about 304 people per day. There is a trend to replace paints with waterborne coatings. There are mainly 4 ways for traditional furniture water paint drying: natural drying, ultraviolet drying, infrared drying, and hot air drying. These drying methods have slow drying speed, poor film forming quality, high requirements for external environmental factors and high cost. Compared with the traditional drying mode, the microwave drying water paint has the advantages that: 1) the drying speed is extremely high; 2) different substances have selective absorption to microwaves and have no shape requirement on the dried object; 3) the heating of the coating is even, no temperature gradient exists, and the thick film can be dried; 4) the utilization rate of energy is high, the utilization rate of the energy is less than 50% by using the traditional drying equipment, and the utilization rate of the energy which is microwave can reach more than 75%, and the energy consumption is reduced by more than 25% compared with the traditional drying equipment; 5) the working efficiency is improved, and the microwave can greatly accelerate the volatilization of the water-based paint, thereby avoiding the influence of different climates and different air humidity on the surface construction of the furniture. 6) The coating film after microwave drying can be immediately polished and packaged, so that the time required by each process is greatly shortened, and the production efficiency is greatly improved; 7) the microwave drying equipment is safe, sanitary and environment-friendly, and has no noise and pollution, and the problem of three wastes is not generated. Therefore, the microwave drying is more suitable for the requirement.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) at present, the traditional drying mode is not enough to meet the domestic market demand and the environmental protection requirement due to the rise of the domestic water-based paint coating industry.
(2) At present, domestic efficient environment-friendly microwave drying equipment has few cases of successful application in the furniture water-based paint industry, the success rate of installation is very low, the microwave drying water-based paint lacks sufficient theoretical guidance, and the drying process needs to be optimized; the microwave drying of the water paint is required to have meticulous and efficient industrialization flow and control method and how to improve the drying efficiency as much as possible.
The difficulty in solving the above problems and defects is: starting from the current water paint drying industry, an efficient integral drying process and a control system are lacked. The microwave drying of the water paint lacks of sufficient theoretical guidance, and the drying process needs to be optimized.
The significance of solving the problems and the defects is as follows:
(1) the environmental benefit analysis, along with the execution of environmental protection policies and the continuous improvement of environmental protection consciousness of consumers, especially the VOC emission limit standard is set out in provinces and cities all over the country, the use of non-solvent type coatings is encouraged, and opportunities are brought to the development of environment-friendly coatings such as water-based paints and the like. According to the relevant data, the total amount of VOCs generated in the key industry of seven major coating industries in the whole country in 2014 is about 300 ten thousand tons, and the maximum amount of VOCs generated by the solvent type wood coating reaches 100 ten thousand tons, which accounts for 1/3 of the total amount of the seven major industries. Although the proportion of the water-based paint in the existing woodware paint in China is less than 10%, the increase of the product is required to be at least more than one time before 2020 according to the requirement of a scheme. If 50% of furniture enterprises change oil into water, the emission of VOCs (volatile organic compounds) can be reduced by 44 ten thousand tons, which is equivalent to the emission of VOCs in the whole automobile industry, and the emission of VOCs comprises original factory paint and refinish paint. In other words, the whole automobile industry needs 100% water change to achieve the emission reduction effect of 50% furniture enterprises. If 30% of furniture enterprises change oil into water, the emission of 27 ten thousand tons of VOCs can be reduced, which is equal to 100% water-based original factory paint for manufacturing the whole automobile. According to statistics of Chinese water paint research institutes, calculated by the sales volume of about 2000 ten thousand tons in 2018 national coating markets, the water paint is used for all the industrial paints accounting for about 60 percent, the VOC emission can be reduced by 960 ten thousand tons, and the consumption of 1920 ten thousand tons of petroleum is saved.
(2) The drying time of the whole coating process flow of the maple synthetic board cabinet is about 5d at room temperature, about 9h at oven heating and drying time, while the microwave heating and drying time is only 20min, so that the efficiency is improved by dozens of times or even hundreds of times. If the oven is operated for 300 days every year according to the oven heating power of 40kW and 8 hours of operation each day, the electricity consumption can be saved by about 100000 degrees per year, which is equivalent to the reduction of 75 tons per year of carbon dioxide emission. Meanwhile, more moisture is discharged in each process of microwave heating and drying, even moisture which is not discharged in the previous processes can be discharged, and the data exceeding 100% appears, so that the requirement of drying the furniture surface coating can be better met. It can also be seen from the spraying effect of the furniture surface coating that the microwave drying has no influence on the fusion and film formation of the aqueous paint emulsion particles while rapidly dehydrating, and the performance of the final coating film is not influenced at all.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a drying control method, a drying control system, drying control equipment, simulation optimization and application of microwave drying.
The invention is realized in such a way that a drying control method for microwave drying comprises the following steps:
a sensing module consisting of eight sensors monitors and feeds back the operation in time to ensure the buffer storage, room entry and delivery of the truck;
a dehumidifier in the dehumidification module performs dehumidification operation on goods to be dried;
according to the set requirement, when the number of trucks in the drying chamber meets the requirement, the isolation doors at two sides of the drying area are closed to dry the materials; the cooling module cools the goods by controlling the fan.
Further, (1) after the system is started, 4 isolating doors are automatically lifted;
(2) providing two modes of operation, manual and automatic;
(3) the dynamic operation mode is divided into four operation stages:
the first stage is as follows: a preparation phase. Opening 4 isolation doors, descending the No. 1-6 stoppers, starting a transmission system, delaying for 5 minutes and entering a second stage;
and a second stage: drying for the first time; according to the logic relation, 3 trucks enter the drying area for drying for the first time, do not flow into the next working area, and still remain in the drying area to wait for the three trucks to enter for secondary drying;
and a third stage: the drying process comprises the steps that normal work is carried out, when the drying area reaches 6 trucks for the first time, a drying program is started to dry the goods, 3 trucks entering for the first time after drying are cooled towards a cooling area, and 3 trucks entering the drying area after dehumidification are prepared to be dried; at the stage, when the microwave generator works each time, 6 trucks are arranged in the drying area;
a fourth stage: and ending, and entering an ending work receiving stage through manual selection. After the work receiving is started, the cargo barrier does not execute the lowering instruction any more; in the stage, the second drying of the last 3 goods adopts the drying mode of 3 trucks; when the automatic mode is finished, the system automatically returns to the manual mode;
(4) before the automatic mode operation, a 3-truck drying mode and a 3-truck drying mode of the working microwave generator are respectively set through a touch screen;
(5) in the automatic operation mode, when the operation has a fault, the system automatically stops operating, and after the fault is eliminated, the system can enter the automatic operation mode by re-selection.
It is a further object of the invention to provide a computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of:
a sensing module consisting of eight sensors monitors and feeds back the operation in time to ensure the buffer storage, room entry and delivery of the truck;
a dehumidifier in the dehumidification module performs dehumidification operation on goods to be dried;
according to the set requirement, when the number of trucks in the drying chamber meets the requirement, the isolation doors at two sides of the drying area are closed to dry the materials; the cooling module cools the goods by controlling the fan.
Another object of the present invention is to provide a drying control system for microwave drying, which implements the drying control method for microwave drying, the drying control system for microwave drying including: the device comprises a track transmission system, an isolation door, a cooling module, a drying module, a dehumidifying module, a sensing module and a human-computer interaction control module; the track transmission system realizes the cyclic motion of the truck by driving the track device, and sequentially conveys products to the designated areas. The division of labor work of dehumidification district, drying area and cooling space is realized to the insulated door, avoids mutual interference. The dehumidification module realizes the dehumidification of goods through the dehumidifier. And the drying module dries the dehumidified goods through the microwave generators controlled in groups. The cooling module uses a controlled fan to cool the goods. The sensing module feeds back the operation in time through the optical fiber sensors distributed in each operation area. The human-computer interaction control module controls the running state of the whole equipment through human-computer interaction.
The human-computer interaction control module is connected with the track transmission system, the cooling module, the drying module, the dehumidifying module, the sensing module and the sensing module.
Furthermore, the inlets and outlets of the cooling module, the drying module and the dehumidifying module are respectively provided with an isolating door.
Further, the drying control system for microwave drying further comprises: track transmission: the circulating motion of the truck is realized, the products are sequentially conveyed to a cache region, a dehumidification region, a drying region, a cooling region and a discharge region, the automatic drying process of the products is completed, and the track transmission consists of a pre-tightening cylinder and a transmission motor;
cargo/unloading area: after the goods are loaded, manually putting down the stopper of the truck to enable the truck to enter a drying working process; in addition, the dried truck is transferred to the end of the loading/unloading area where the worker unloads the dried cargo, and the empty truck is used for the next loading;
a cache region: the buffer device is used for buffering the truck loaded with goods to be dried; the device consists of two blocking cylinders and two optical fiber sensors: the damper 1 ensures that the number of trucks in the buffer area is not more than three, the damper 2 realizes the buffer function, the sensor 1 is used for detecting whether the vehicles in the buffer area are full of three, the sensor 2 counts the vehicles flowing from the buffer area to the dehumidification area, and when the count reaches 3, the vehicles in the buffer area are prohibited from flowing to the dehumidification area;
a dehumidification area: dehumidifying the goods to be dried; two isolation doors are adopted to isolate the working area from the cache area and the drying area; the components are a cargo stopper, a dehumidifier and an optical fiber sensor: the cargo barrier is used for ensuring that the trucks do not move in the dehumidification process, the dehumidifier realizes the dehumidification function, and the optical fiber sensor closes the No. 1 isolation door when determining that the trucks in the dehumidification area are three;
a drying area: drying the dehumidified goods, wherein the drying device consists of 50 microwave generators at the top and 36 microwave generators on the left side and the right side respectively, the 3 rd microwave generator is a group, each group is independently controlled, the number of the microwave generators which simultaneously work at each time is not more than 48, and a stopper is adopted in the drying area to ensure the stop of the truck; the drying zone realizes the drying of 3 cars or 6 cars of goods once, and the number of the trucks entering the drying zone is determined by two optical fiber sensors: the number 4 optical fiber sensor counts the trucks entering the drying area, and the number 5 optical fiber sensor counts the trucks flowing out of the drying area;
a cooling area: cooling the dried goods, wherein the dried goods are positioned between a No. 3 isolating door and a No. 4 isolating door, the number of the trucks entering the area is detected by adopting an optical fiber sensor, the trucks are blocked by using a No. 5 blocking cylinder from entering the next area, and the goods are cooled by using a controlled fan;
shipment subregion: an optical fiber sensor is adopted to count the trucks flowing out of the cooling area, when the value reaches 3, the 4# isolation door is closed, the 8 # optical fiber sensor is matched with the stopper to adjust the distance between the trucks, so that the trucks are ensured not to collide when turning, and the flowing trucks are conveyed to the cargo carrying/holding area through a transmission line to complete unloading and then reloading to enter the next cycle;
an isolation door: the automatic working area is divided into 5 areas by adopting 4 isolation doors, the 1# isolation door is positioned between the buffer area and the dehumidification area, the 2# door is positioned between the dehumidification area and the drying area, the 3# isolation door is used for separating the drying area from the cooling area, and the 4# isolation door is positioned at the tail end of the production line after being positioned in the cooling area.
Another objective of the present invention is to provide a simulation optimization method for the drying control method of microwave drying, wherein the simulation optimization method comprises: under the action of electromagnetic heat, the laminar flow drying airflow passes through a porous medium containing liquid water and water vapor, and the visualization of temperature and water content changes is realized through post-treatment. The simulation optimization provides theoretical guidance for microwave drying of the water-based paint. Before materials with different shapes are dried, parametric scanning modeling can be carried out, and the optimal drying parameters are determined through multi-physical-field simulation.
Further, the simulation optimization method further includes:
(1) building a three-dimensional model in COMSOL software, wherein the model comprises four parts, namely a rectangular waveguide, a square material with the thickness of 5mm, a heating cavity and an air inlet and an air outlet which are arranged in a surrounding manner;
(2) sequentially adding microwave heating in electromagnetic heating to simulate the distribution of an electric field and a temperature field in a space; laminar flow in non-isothermal flow simulates a flow field in a space, a dilute substance transfer module in temperature transfer and two chemical substance transfer of fluid flow in a free flow domain is explored, the evaporation process of liquid water is simulated, and interstitial transfer between two phases and change of water content are realized;
(3) in the porous material, a liquid phase and a gas phase exist simultaneously, and in order to better describe the fluid of the porous medium domain, the attribute properties of the material including wet air are manually defined; setting the initial water content of the material as a function of the relevant coordinates; taking the material of a centered on the origin (0,0,0) as an example, if the surface moisture content changes exponentially from inside to outside, and the moisture content below the surface t is assumed to be constant, the moisture content g is described as:
(4) carrying out free tetrahedral mesh subdivision on the model domain, and adding a boundary layer to the plate;
(5) the method of intermittent heating is adopted, and the whole intermittent heating flow is set up: the method comprises the following steps: selecting a frequency domain, selecting a frequency of 2.45GHz, selecting electromagnetic waves, performing interface selection on the frequency domain, and calculating the distribution of electromagnetic fields in a space; secondly, the step of: selecting a steady state, selecting a laminar flow interface, and calculating the velocity distribution of a flow field in a space; ③: selecting transient state of the step, setting the time step as range (0,1, t1), selecting two dilute substance transfer interfaces of solid heat transfer and fluid heat transfer, and solving the initial value of the solution variable by adopting solution of I; fourthly, the method comprises the following steps: selecting transient state of the step, setting time step as range (t1,1, t2), selecting fluid heat transfer and two dilute material transfer interfaces, solving initial values of variables and adopting solution at t1 moment of the third step;
(6) obtaining the distribution state of the temperature by adding a three-dimensional drawing group; the water content is described by W — Mn _ l _ cl/rho _ p, where Mn _ l is the molecular weight per mole of liquid water, cl is the concentration of liquid water in the porous media sheet, rho _ p is the density of the porous sheet substrate; the temperature versus moisture content curve is plotted over time by adding the derivative values.
Further, the simulation optimization method further includes:
(1) and (3) carrying out high-precision mesh generation on the outer surface of the material: taking a square material with the thickness of 5mm as an example, on the basis of mesh subdivision, adding boundary layer meshes, wherein the thickness of the boundary layer is determined according to the actual appearance water-bearing layer condition, and the boundary layer is slightly thicker than the actual external coating water-bearing layer;
(2) the position of the waveguide tube is optimized, and for the microwave resonant cavity excited by multiple break ports, the break port position has great influence on the electric field distribution. The nonuniform characteristic of an electric field in a space can be relieved to a great extent by adjusting the position of the waveguide;
(3) the waveguide power and the intermittent time are improved, the intermittent time corresponding to different powers is set for different heating objects to dissipate heat in time, and wet air in the box body is taken away through fluid flow.
Further comprising: selecting material heating time as a design variable, and adopting an optimization model of material drying as follows:
Find.Time(heating)＝{t1,t2,···，tm,}
Min.g, water content;
s.t.T(max)<A，T(end)<B；
time, total ═ C;
the optimization aim is to ensure that the highest temperature of the material does not exceed A in the period C, and the water content g of the material is minimum by adjusting the heating time under the condition that the final cooling temperature is not higher than B.
The invention also aims to provide a method for coating the water-based paint, which uses the drying control system for microwave drying.
The invention also aims to provide a method for processing and storing agricultural products, which uses the drying control system for microwave drying.
Further, the agricultural product is potato, pepper, honeysuckle or tobacco stalk.
The invention also aims to provide a method for converting the biomass new energy, which uses the drying control system for microwave drying.
Another object of the present invention is to provide a method for oil field exploration using the microwave drying control system.
The invention also aims to provide a method for repairing the pits and cracks of the asphalt pavement, which uses the drying control system for microwave drying.
Another object of the present invention is to provide a method for upgrading low-quality coal using the drying control system of microwave drying.
By combining all the technical schemes, the invention has the advantages and positive effects that: the PLC-based touch control system is connected with the whole process module, and all the modules are in a manual mode and an automatic mode, so that the whole operation process is ensured to be performed orderly.
Table 1 comparison of drying effect for experiment (maple synthetic board cabinet as test base)
The drying time of the whole coating process flow of the maple synthetic board cabinet can be obtained from the table 1, the room temperature natural drying time is about 5d, the oven heating drying time is about 9h, and the microwave heating drying time is only 20min, so that the efficiency is improved by dozens of times or even hundreds of times. If the oven is operated for 300 days every year according to the oven heating power of 40kW and 8 hours of operation each day, the electricity consumption can be saved by about 100000 degrees per day, which is equivalent to the reduction of 75 tons per day of carbon dioxide emission. Meanwhile, more moisture is discharged in each process of microwave heating and drying, even moisture which is not discharged in the previous processes can be discharged, and the data exceeding 100% appears, so that the requirement of drying the furniture surface coating can be better ensured. It can also be seen from the spraying effect of the furniture surface coating that the microwave drying can be quickly dehydrated without influencing the fusion and film formation of the emulsion particles of the water-based paint, and the performance of the final coating film is not influenced at all.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a drying control method for microwave drying according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a drying control system for microwave drying according to an embodiment of the present invention;
in fig. 2: 1. a track transport system; 2. an isolation gate; 3. a cooling module; 4. a drying module; 5. a dehumidification module; 6. a sensing module; 7. human-computer interaction control module (PLC).
Fig. 3 is a schematic diagram of a three-dimensional model provided by an embodiment of the invention.
Fig. 4 is a schematic diagram of free tetrahedral mesh generation according to the embodiment of the present invention.
Fig. 5(a) is a graph showing the temperature vs. water content curves over time 0s according to the embodiment of the present invention.
Fig. 5(b) is a schematic diagram of the temperature vs. moisture content curve over time 10s according to an embodiment of the present invention.
Fig. 5(c) is a schematic graph of the temperature vs. moisture content over time 20s as provided by an embodiment of the present invention.
Fig. 5(d) is a schematic graph of the temperature vs. moisture content curve over time for 30s according to an embodiment of the present invention.
Fig. 5(e) is a schematic diagram of the temperature vs. moisture content curve over time 40s as provided by the example of the present invention.
FIG. 5(f) is a schematic graph showing the temperature vs. moisture content curve over time of 50s according to an embodiment of the present invention.
Fig. 6 is a velocity profile schematic of a flow field provided by an embodiment of the present invention.
Fig. 7 is a schematic subdivision diagram of a mesh provided in the embodiment of the present invention.
Fig. 8(a) is a schematic diagram of adjusting the position of a waveguide according to an embodiment of the present invention.
Fig. 8(b) is a schematic diagram of adjusting the position of the waveguide according to the embodiment of the present invention.
Fig. 8(c) is a schematic diagram of adjusting the position of the waveguide according to the embodiment of the present invention.
Fig. 8(d) is a diagram illustrating the position of the tuning waveguide according to the embodiment of the present invention.
Fig. 9 is a schematic diagram of the variation of water content within 50s-300s provided by an embodiment of the present invention.
FIG. 10 is a schematic of the water distribution at 350s provided by an example of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a drying control method, system, device, simulation optimization and application for microwave drying, and the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the drying control method of microwave drying provided by the present invention includes the following steps:
s101: a sensing module consisting of eight sensors monitors and feeds back the operation in time to ensure the buffer storage, room entry and delivery of the truck;
s102: a dehumidifier in the dehumidification module is used for dehumidifying goods to be dried, the microwave generators are independently controlled in groups, and the number of the microwave generators in each working process is not more than 48;
s103: according to the set requirement, when the number of trucks in the drying chamber meets the requirement, the isolation doors on two sides of the drying area are closed to dry the materials; the cooling module cools the goods by controlling the fan.
Persons of ordinary skill in the art can also use other steps to implement the drying control method for microwave drying provided by the present invention, and the drying control method for microwave drying provided by the present invention in fig. 1 is only one specific embodiment.
The drying control method for microwave drying provided by the invention further comprises the following steps:
(1) after the system is started, automatically lifting 4 isolation doors;
(2) providing two modes of operation, manual and automatic;
(3) the dynamic operation mode is divided into four operation stages:
the first stage is as follows: a preparation phase. Opening 4 isolation doors, descending the No. 1-6 stoppers, starting a transmission system, delaying for 5 minutes and entering a second stage;
and a second stage: and (5) drying for the first time. According to the logic relation, 3 trucks enter the drying area for drying for the first time, do not flow into the next working area, and still remain in the drying area to wait for the three trucks to enter for secondary drying;
and a third stage: and (4) working normally. After the drying area reaches 6 trucks for the first time, the drying program is started to dry the goods, 3 trucks which enter the drying area for the first time after drying are cooled towards the cooling area, and 3 trucks which enter the drying area after dehumidification are prepared to be dried. At this stage the load cars inside the drying zone were 6 each time the microwave generator was operated.
A fourth stage: and (6) ending. And entering a finishing work receiving stage through manual selection. When the receiving operation is started, the cargo barrier does not execute the lowering command any more. In this stage, the second drying of the last 3 goods is performed in the drying mode of 3 trucks. When the automatic mode is finished, the system automatically returns to the manual mode;
(4) before the automatic mode operation, a 3-truck drying mode and a 3-truck drying mode of the working microwave generator are respectively set through a touch screen;
(5) in the automatic operation mode, when the operation has a fault, the system automatically stops operating, and after the fault is eliminated, the system can enter the automatic operation mode by re-selection.
As shown in fig. 2, the drying control system for microwave drying provided by the present invention includes: the device comprises a track transmission system 1, an isolation door 2, a cooling module 3, a drying module 4, a dehumidifying module 5, a sensing module 6 and a human-computer interaction control module (PLC) 7.
The track transmission system 1 is connected with the cooling module 3, the drying module 4, the dehumidifying module 5, the sensing module 6 and the human-computer interaction control module (PLC)7, and the human-computer interaction control module (PLC)7 is connected with the sensing module 6 and the fan 7; the fan 7 is connected with the cooling module 3 and the drying module 4.
And the inlets and outlets of the cooling module 3, the drying module 4 and the dehumidifying module 5 are respectively provided with an isolating door. The track transmission system 1 realizes the cyclic motion of the trucks by driving the track devices, and sequentially conveys the products to the designated areas. The division of labor work of dehumidification district, drying area and cooling space is realized to the insulated door 2, avoids mutual interference. The dehumidification module 5 realizes the dehumidification of the goods through the dehumidifier. And the drying module 4 dries the dehumidified goods through a microwave generator controlled in groups. The cooling module 3 uses a controlled fan to cool the goods. The sensing module 6 feeds back the operation in time through the optical fiber sensors distributed in each operation area. The human-computer interaction control module 7 controls the running state of the whole equipment through human-computer interaction.
The control of the track transmission system 1 is realized through a transmission motor by a human-computer interaction control module (PLC)7, the control of a cooling module 3 is realized through a fan by the human-computer interaction control module (PLC)7, the control of a drying module 4 is realized through a microwave generator by the human-computer interaction control module (PLC)7, the control of a dehumidifying module 5 is realized through a dehumidifier by the human-computer interaction control module (PLC)7, and the control of a sensing module 6 is realized through 8 optical fiber sensors by the human-computer interaction control module (PLC) 7.
The PLC-based touch control system is connected with the whole process module, and all the modules are in manual and automatic modes, so that the whole operation process is ensured to be orderly carried out. The sensing module 6 consisting of eight sensors can monitor and feed back the operation in time, so as to ensure the buffer storage, room entering and delivery of the truck. The dehumidifier inside dehumidification module 5 dehumidifies the goods to be dried, and drying module 4 is nearly eighty or so microwave generators in total, and microwave generators group independent control, and the microwave generators of during operation at every turn do not exceed 48, according to the settlement requirement, when the van quantity in the drying chamber satisfies the requirement, then can close the isolation door of drying district both sides and dry the material. The cooling module 3 cools the goods by controlling the fan 7.
The microwave drying control system provided by the invention comprises the following parts:
1. track transmission: the circulating motion of the truck is realized, and the products are sequentially conveyed to the cache region, the dehumidification region, the drying region, the cooling region and the unloading region, so that the automatic drying process of the products is completed. The track transmission mainly comprises a pre-tightening air cylinder and a transmission motor;
2. cargo/unloading area: in the working area, the goods loading is finished, and the truck stopper is manually put down to enable the truck to enter a drying working process; in addition, the dried truck is transported to the end of the loading/unloading zone where the worker unloads the dried cargo and the empty truck is used for the next loading. The working area control part is a blocking cylinder (No. 7 hook);
3. a cache region: this area is used for buffering the van that carries the goods that wait to dry to carry out the stoving operation to many goods simultaneously. This zone consists of two blocking cylinders and two fiber optic sensors: the method comprises the following steps that a No. 1 blocker confirms that a truck in a cache region is not more than three (1 hook), a No. 2 blocker realizes a cache function (2 hook), a No. 1 sensor is used for detecting whether the vehicles in the cache region are full of three, a No. 2 sensor counts the vehicles flowing from the cache region to a dehumidification region, and when the count reaches 3, the vehicles in the cache region are forbidden to flow to the dehumidification region;
3. a dehumidification area: and dehumidifying the goods to be dried. The area can contain three trucks for dehumidification, and the area adopts two isolation doors (1# isolation door and 2# isolation door) to isolate the working area from the previous working area (buffer area) and the next working area (drying area). The main components of this area are a cargo barrier (hook No. 3), a dehumidifier and a fiber optic sensor (sensor No. 3): the cargo barrier is used for ensuring that the cargo trucks do not move in the dehumidification process, the dehumidifier realizes the dehumidification function, and the optical fiber sensor closes the 1# isolation door when determining that the cargo trucks in the dehumidification area are three.
4. A drying area: and drying the dehumidified goods. The drying device consists of 50 microwave generators at the top and 36 microwave generators at the left side and the right side respectively, the 3 rd microwave generator is a group, each group is independently controlled, and the number of the microwave generators which simultaneously work at each time is not more than 48. The drying area adopts a stopper (No. 4 hook) to ensure the stop of the truck. The drying zone can realize the drying of 3 cars or 6 cars of goods once, and the number of the trucks entering the drying zone is determined by two optical fiber sensors: the number 4 optical fiber sensor counts the trucks entering the drying area, and the number 5 optical fiber sensor counts the trucks flowing out of the drying area. According to the setting requirement, only when the van of the drying area meets the setting requirement, the isolation doors on two sides of the drying area are closed to dry the goods. The electric control and detection components of the area are as follows: 4 sets of microwave generators, 1 blocking cylinder (No. 4 hook) and 2 optical fiber sensors (No. 4 and No. 5).
5. A cooling area: and cooling the dried goods. This district is located between 3# and 4# isolation door, adopts an optic fibre (6) sensor to detect the van quantity that gets into this region, uses 5 to block cylinder (5 colludes) and blocks the van and get into next region, uses the controlled fan to carry out cooling treatment to the goods.
6. Shipment subregion: in the area, a (7) optical fiber sensor is adopted to count the trucks flowing out from the cooling area, when the value reaches 3, the 4# isolation door is closed, and the 8 # optical fiber sensor is matched with the stopper (6 # hook) to adjust the distance between the trucks, so that the trucks are ensured not to collide when turning. The truck which flows out here is transported via a transmission line to the loading/holding away area for complete unloading and then reloading into the next cycle.
7. An isolation door: the system adopts 4 isolation doors to divide the automatic working area into 5 areas, ensures that each area works independently and has the function of preventing personal injury caused by the exposure of microwaves. The 1# isolation door is located between the buffer area and the dehumidification area, the 2# door is located between the dehumidification area and the drying area, the 3# isolation door separates the drying area from the cooling area, and the 4# isolation door is located at the tail end of the production line after the cooling area.
TABLE 2 logic control requirements
The technical solution of the present invention is further described below with reference to the accompanying drawings.
The invention relates to a simulation method, which comprises the following steps: microwave drying is a complex multi-physical field coupling process, and physical effects to be considered comprise electromagnetic field distribution, fluid flow, porous medium heat transfer and water evaporation, and the effects are strongly coupled. The model describes the process of laminar flow drying air flow passing through a porous medium containing liquid water and water vapor under the action of electromagnetic heat, and the visualization of the temperature and the water content change is realized through post-treatment.
1. And (3) building a three-dimensional model of the figure 3 in COMSOL software, wherein the model comprises four parts of a rectangular waveguide, a square plate with the thickness of 5mm, a heating cavity and an air inlet and an air outlet which are arranged in a surrounding manner.
2. Sequentially adding microwave heating (simulating the distribution of an electric field and a temperature field in a space) in electromagnetic heating; laminar flow in "non-isothermal flow" (simulating the flow field in space, exploring the temperature transfer in the fluid flow versus free flow domain) and "dilute mass transfer" modules in two "chemical mass transfers" (simulating the evaporation process of liquid water, achieving mass transfer between two phases, thus studying the change in water content).
3. In the porous plate material, a liquid phase and a gas phase exist simultaneously, and in order to better describe the fluid of the porous medium domain, the material property attribute including the humid air is manually defined. Coated panels tend to exhibit a distribution of wet-out and dry-in-wet-out, and in order to accurately describe the initial moisture content of the panel, the initial moisture content of the panel is set as a function of the relevant coordinates. Taking the sheet material of a centered at the origin (0,0,0), the water content g can be described as follows if the surface water content changes exponentially from inside to outside, assuming constant water content below the surface t:
4. as shown in fig. 4, the free tetrahedral mesh is divided into model domains, and the division accuracy depends on the size of the model. In order to describe the change of the water content of the coated plate more accurately, a boundary layer is added to the plate, and the calculation precision is improved.
5. The microwave heating speed is high, the efficiency is high, in order to avoid the microwave heating temperature being too high, an intermittent heating mode is adopted, and the fan is always in a working state in the process, so that the whole intermittent heating process is set up by adopting the following calculation method: the method comprises the following steps: the first study is as follows: selecting a research step of 'frequency domain', selecting the frequency of 2.45GHz, selecting an 'electromagnetic wave and frequency domain' interface, and calculating the distribution of an electromagnetic field in a space. Secondly, the step of: study two: selecting a research step of 'steady state', checking a 'laminar flow' interface, and calculating the velocity distribution of a flow field in a space. ③: study three (calculating the temperature and moisture content changes of the waveguide during operation): selecting a research step of 'transient state', setting a time step as 'range (0,1, 60)', checking two 'dilute substance transfer' interfaces of 'solid heat transfer' and 'fluid heat transfer', solving initial values of variables and adopting a solution of 'research one'. Fourthly, the method comprises the following steps: study four (calculating the changes of temperature and water content in the non-working state of the waveguide): selecting a research step 'transient state', setting a time step as 'range (60,1, 360)', checking 'fluid heat transfer' and two 'dilute substance transfer' interfaces, solving the initial value of a variable and adopting a solution at the 60s moment of research III.
6. And (5) carrying out aftertreatment on the result. The distribution state of the temperature can be easily seen by adding a three-dimensional drawing group; the water content can be described by W — Mn _ l _ cl/rho _ p, where Mn _ l is the molecular weight per mole of liquid water, cl is the concentration of liquid water in the porous dielectric sheet, and rho _ p is the density of the porous sheet substrate. The temperature vs. moisture content curves were plotted over time by adding the derivative (volume average) method. Temperature distribution state of the surface of the plate within 0-50 s: as shown in fig. 5(a) -5 (f). The velocity profile of the flow field is shown in fig. 6.
Secondly, an optimization method comprises the following steps:
1. mesh subdivision: for a coating product, the water content inside and outside the dried object is obviously different, the most severe part for drying is often generated on the outer surface of the material, and therefore, in order to improve the simulation precision, the high-precision mesh subdivision needs to be performed on the outer surface of the material: taking a square plate with the thickness of 5mm as an example, on the basis of grid subdivision, boundary layer grids are added, the thickness of the boundary layer is determined according to the actual outer surface water-bearing layer condition, and the boundary layer is slightly thicker than the actual outer coating water-bearing layer. As shown in fig. 7.
2. Optimizing the position of the waveguide:
microwave heating has the disadvantage of non-uniform heating due to the non-uniform electric field distribution in space, and the non-uniform nature is fundamentally impossible to eliminate and can only be alleviated in various ways. For the microwave resonant cavity excited by multiple break ports, the break port position has great influence on the distribution of an electric field. The non-uniform nature of the electric field in space can be greatly mitigated by adjusting the position of the waveguide. As shown in fig. 8(a) -8 (d).
In the above comparative simulation, it is not difficult to find that the non-uniformity of the electric field is greatly improved by the waveguide placement method with central rotational symmetry in space and the relative waveguide directions are staggered.
3. Improvement of waveguide power and tact time. Different materials have different material properties and different heat resistance, and the phenomenon of edge warping and the like of the heated object can be caused by overhigh temperature, so that different heated objects need to be set with different power corresponding intermittent time to dissipate heat in time, and wet air in the box body is taken away through fluid flow.
Selecting material heating time as a design variable, and adopting an optimization model of material drying as follows:
Find.Time(heating)＝{t1,t2,···，tm,}
Min.g (water content)
s.t.T(max)<A，T(end)<B
Time (total) ═ C
The optimization aim is to ensure that the highest temperature of the material does not exceed A in the period C, and the water content g of the material is minimum by adjusting the heating time under the condition that the final cooling temperature is not higher than B. As shown in fig. 9.
Taking the maximum temperature which can be endured by the heated plate without being damaged as 95 ℃, the temperature after cooling is not higher than 70 ℃ and the total time is 350s as an example, as shown in FIG. 10.
TABLE 1
| Heating time(s) | 30 | 35 | 40 | 45 | 50 |
| Maximum temperature (. degree. C.) | 68.3 | 74.5 | 81.6 | 85.9 | 94.7 |
| Temperature after Cooling (. degree. C.) | 41.3 | 53.1 | 62.6 | 72.4 | 83.7 |
| Water content (%) | 24.5 | 24.15 | 23.85 | 23.4 | 23 |
It can be seen that the heating effect for 40s is best in case the processes t (max) < a, t (end) < B are met.
It should be noted that the embodiments of the present invention can be realized by hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or specially designed hardware. Those skilled in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such code provided on a carrier medium such as a diskette, CD-or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier, for example. The apparatus and its modules of the present invention may be implemented by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of hardware circuits and software, e.g., firmware.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention disclosed in the present invention should be covered within the scope of the present invention.
Claims (12)
1. A drying control method for microwave drying is characterized by comprising the following steps:
a sensing module consisting of eight sensors monitors and feeds back the operation in time to ensure the buffer storage, room entry and delivery of the truck;
a dehumidifier in the dehumidification module performs dehumidification operation on goods to be dried;
according to the set requirement, when the number of trucks in the drying chamber meets the requirement, the isolation doors on two sides of the drying area are closed to dry the materials; the cooling module cools the goods by controlling the fan.
2. The drying control method of microwave drying according to claim 1, wherein the drying control method of microwave drying further comprises:
(1) after the system is started, automatically lifting 4 isolation doors;
(2) providing two modes of operation, manual and automatic;
(3) the dynamic operation mode is divided into four operation stages:
the first stage is as follows: a preparation phase. Opening 4 isolation doors, descending the No. 1-6 stoppers, starting a transmission system, delaying for 5 minutes, and entering a second stage;
and a second stage: drying for the first time; according to the logic relation, 3 trucks enter the drying area for drying for the first time, do not flow into the next working area, and still remain in the drying area for waiting for the three trucks at the back to enter for secondary drying;
and a third stage: the drying process is started to dry the goods after the drying area reaches 6 trucks for the first time, 3 trucks entering for the first time after drying flow to the cooling area to be cooled, and 3 trucks entering the drying area to be dried after dehumidification is completed; at the stage, when the microwave generator works each time, 6 trucks are arranged in the drying area;
a fourth stage: and ending, and entering an ending work receiving stage through manual selection. After the work is received, the cargo barrier does not execute the lowering instruction any more; in the stage, the second drying of the last 3 goods adopts the drying mode of 3 trucks; when the automatic mode is finished, the system automatically returns to the manual mode;
(4) before the automatic mode operation, respectively setting a drying mode of 3 trucks and a drying mode of 3 trucks of the working microwave generator through a touch screen;
(5) in the automatic operation mode, when the operation has a fault, the system automatically stops operating, and after the fault is eliminated, the system can enter the automatic operation mode by re-selection.
3. A computer device, characterized in that the computer device comprises a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to carry out the steps of:
a sensing module consisting of eight sensors monitors and feeds back the operation in time to ensure the buffer storage, room entry and delivery of the truck;
a dehumidifier in the dehumidification module performs dehumidification operation on goods to be dried;
according to the set requirement, when the number of trucks in the drying chamber meets the requirement, the isolation doors on two sides of the drying area are closed to dry the materials; the cooling module cools the goods by controlling the fan.
4. A drying control system for microwave drying for implementing the drying control method for microwave drying according to any one of claims 1 to 2, wherein the drying control system for microwave drying comprises: the system comprises a track transmission system, an isolation door, a cooling module, a drying module, a dehumidifying module, a sensing module and a human-computer interaction control module;
the human-computer interaction control module is connected with the track transmission system, the cooling module, the drying module, the dehumidifying module, the sensing module and the sensing module.
5. The drying control system of microwave drying according to claim 4, wherein the inlet and outlet of the cooling module, the drying module, and the dehumidifying module are respectively installed with an isolation door.
6. The drying control system for microwave drying of claim 4, wherein said microwave drying control system further comprises:
track transmission: the circulating motion of the truck is realized, the products are sequentially conveyed to a cache region, a dehumidification region, a drying region, a cooling region and a discharge region, the automatic drying process of the products is completed, and the track transmission consists of a pre-tightening cylinder and a transmission motor;
cargo/unloading area: after the goods are loaded, manually putting down the truck stopper to enable the truck to enter a drying working process; in addition, the dried truck is transferred to the end of the loading/unloading area where the worker unloads the dried cargo, and the empty truck is used for the next loading;
a cache region: the buffer device is used for buffering the truck loaded with goods to be dried; the device consists of two blocking cylinders and two optical fiber sensors: the buffer area comprises a buffer area, a sensor and a controller, wherein the buffer area comprises a buffer area 1, a damper 2, a sensor and a controller, wherein the buffer area comprises a buffer area, the number of the buffer area is less than three, the buffer area comprises a buffer area, the sensor 1 is used for detecting whether vehicles in the buffer area are full of three vehicles, the sensor 2 counts the vehicles flowing from the buffer area to a dehumidification area, and;
a dehumidification area: dehumidifying the goods to be dried; two isolation doors are adopted to isolate the working area from the cache area and the drying area; the components are a cargo stopper, a dehumidifier and a fiber-optic sensor: the cargo barrier is used for ensuring that the trucks do not move in the dehumidification process, the dehumidifier realizes the dehumidification function, and the optical fiber sensor closes the 1# isolation door when determining that the trucks in the dehumidification area are three;
a drying area: drying the dehumidified goods, wherein the drying device consists of 50 microwave generators at the top and 36 microwave generators on the left side and the right side respectively, the 3 rd microwave generator is a group, each group is independently controlled, the number of the microwave generators which simultaneously work at each time is not more than 48, and a stopper is adopted in the drying area to ensure the stop of the truck; the drying of 3 cars or 6 cars of goods is realized to the drying zone single time, and the van quantity that gets into the drying zone is confirmed by two optical fiber sensor: the number 4 optical fiber sensor counts the trucks entering the drying area, and the number 5 optical fiber sensor counts the trucks flowing out of the drying area;
a cooling area: cooling the dried goods, wherein the dried goods are positioned between a No. 3 isolating door and a No. 4 isolating door, the number of the trucks entering the area is detected by adopting an optical fiber sensor, the trucks are blocked by using a No. 5 blocking cylinder from entering the next area, and the goods are cooled by using a controlled fan;
shipment subregion: an optical fiber sensor is adopted to count the trucks flowing out of the cooling area, when the value reaches 3, the 4# isolation door is closed, the 8 # optical fiber sensor is matched with the stopper to adjust the distance between the trucks, so that the trucks are ensured not to collide when turning, and the flowing trucks are conveyed to the cargo carrying/holding area through a transmission line to complete unloading and then reloading to enter the next cycle;
an isolation door: the automatic working area is divided into 5 areas by adopting 4 isolation doors, the 1# isolation door is positioned between the buffer area and the dehumidification area, the 2# door is positioned between the dehumidification area and the drying area, the 3# isolation door is used for separating the drying area from the cooling area, and the 4# isolation door is positioned at the tail end of the production line after the cooling area.
7. A simulation optimization method of the drying control method of microwave drying according to any one of claims 1 to 2, characterized in that the simulation optimization method comprises: under the action of electromagnetic heat, the laminar flow drying airflow passes through a porous medium containing liquid water and water vapor, and the visualization of the temperature and water content change is realized through post-treatment; carrying out parametric scanning modeling on materials with different shapes before drying, and determining drying parameters through multi-physical-field simulation.
8. The simulation optimization method of claim 7, further comprising:
(1) building a three-dimensional model in COMSOL software, wherein the model comprises four parts, namely a rectangular waveguide, a square material with the thickness of 5mm, a heating cavity and an air inlet and an air outlet which are arranged in a surrounding manner;
(2) sequentially adding microwave heating in electromagnetic heating to simulate the distribution of an electric field and a temperature field in a space; laminar flow in non-isothermal flow simulates a flow field in space, and temperature transfer of fluid flow to a free flow domain is explored; the two dilute substance transfer modules in the chemical substance transfer simulate the evaporation process of liquid water, realize the interstitial transfer between two phases and explore the change of water content;
(3) in the porous material, a liquid phase and a gas phase exist simultaneously, and in order to better describe the fluid of the porous medium domain, the attribute properties of the material including wet air are manually defined; setting the initial moisture content of the sheet as a function of the relevant coordinates; taking the sheet material of a centered on the origin (0,0,0), if the surface water content changes exponentially from inside to outside, assuming a constant water content below the surface t, the water content g is described as:
(4) performing free tetrahedral mesh subdivision on the model domain, and adding a boundary layer to the material;
(5) the method of intermittent heating is adopted, and the whole intermittent heating flow is set up: the method comprises the following steps: selecting a frequency domain, selecting a frequency of 2.45GHz, selecting electromagnetic waves, performing interface selection on the frequency domain, and calculating the distribution of electromagnetic fields in a space; secondly, the step of: selecting a steady state, selecting a laminar flow interface, and calculating the velocity distribution of a flow field in a space; ③: selecting transient state of the step, setting the time step as range (0,1, t1), selecting two dilute substance transfer interfaces of solid heat transfer and fluid heat transfer, solving the initial value of the variable and adopting solution of (I); fourthly, the method comprises the following steps: selecting transient state of the step, setting time step as range (t1,1, t2), selecting fluid heat transfer and two dilute material transfer interfaces, solving initial values of variables and adopting solution at t1 moment of the third step;
(4) obtaining the distribution state of the temperature by adding a three-dimensional drawing group; the water content is described by W ═ Mn _ l cl/rho _ p, where Mn _ l is the molecular weight per mole of liquid water, cl is the concentration of liquid water in the porous media mass, rho _ p is the density of the porous sheet matrix; the temperature versus moisture content curve is plotted over time by adding the derivative values.
9. The simulation optimization method of claim 7, further comprising:
(1) and (3) carrying out high-precision mesh generation on the outer surface of the material: taking a square material with the thickness of 5mm as an example, adding boundary layer grids on the basis of grid subdivision, wherein the thickness of the boundary layer is determined according to the actual appearance water-bearing layer condition, and the boundary layer is slightly thicker than the actual external coating water-bearing layer; selecting material heating time as a design variable, and adopting an optimization model of material drying as follows:
Find.Time(heating)＝{t1,t2,…，tm,}
Min.g, water content;
s.t.T(max)<A，T(end)<B；
time, total ═ C;
the optimization target is that in the time period C, the highest temperature of the material is ensured not to exceed A, and the water content g of the material is minimized by adjusting the heating time under the condition that the final cooling temperature is not higher than B;
(2) the position of the waveguide tube is optimized, for the microwave resonant cavity excited by multiple break mouths, the break mouth position has great influence on the distribution of an electric field, and the uneven characteristic of the electric field in the space can be relieved to a great extent by adjusting the position of the waveguide tube;
(3) the waveguide power and the intermittent time are improved, the intermittent time corresponding to different powers is set for different heating objects to dissipate heat in time, and wet air in the box body is taken away through fluid flow.
10. A method for painting an aqueous paint, characterized in that the drying control system for microwave drying according to claim 4 is used in the method for painting an aqueous paint.
11. A method for processing and storing agricultural products, which is characterized by using the drying control system for microwave drying of claim 4.
12. The method of processing and storing agricultural products of claim 11, wherein the agricultural products are potatoes, hot peppers, honeysuckle flowers or tobacco stalks.
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| CN117989844B (en) * | 2024-04-03 | 2024-05-31 | 长盛(廊坊)科技有限公司 | Control method, system, equipment and medium for drying nascent fiber |
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