CN113342083B - Intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation - Google Patents
Intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation Download PDFInfo
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Abstract
The invention discloses an intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation, and relates to the technical field of intelligent heating. The target heating temperature is subjected to data exchange with the central control module through RS-485 communication through the man-machine module, the current heating temperature is detected by the temperature sensor, a detected temperature signal is directly converted into a digital signal, the digital signal is transmitted to the central control module and is processed by the central control module, the central control module compares the current heating temperature with the set temperature, a control quantity is given through a certain intelligent control algorithm, the optical coupler is controlled, and then the conduction angle of the thyristor is controlled through the optical coupler, so that the effect of controlling the radiation intensity of the terahertz heating plate is achieved, the heating temperature is adjustable in real time, the requirements of modern high efficiency, green and automation are met, and in the production process, the product quality can be improved due to the characteristic of uniform heating, so that the research has profound significance.
Description
Technical Field
The invention belongs to the technical field of terahertz heating, and particularly relates to an intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation.
Background
For example, chinese patent CN211171412U discloses a drying system for papermaking, which comprises a boiler, a steam main connected to the boiler, a drying module connected to the steam main, a condensate tank and a water return pump; chinese patent CN205213970U discloses a food dryer, including stoving case, transport link joint, driving motor and heating system, chinese patent CN208688227U discloses a continuous type dryer cold wind waste heat recovery device, includes: the drying and dehumidifying equipment in the existing industries of papermaking, pharmacy, chemical industry, food and the like is mostly realized by adopting a steam boiler or an electric heating mode.
The main defects are as follows:
1. steam boiler can generate steam in the drying process, the drying effect is not ideal, and water can be mixed;
2. the electric heating drying technology is old, the heating area is not uniform, the cost is high, and the heat efficiency is low.
Compared with a heating mode taking coal as fuel and an electric heating oil bath heating mode, the terahertz heating mode has the advantages of high conversion rate, stable heating, low operation cost, relatively uniform heating and the like. The terahertz (far infrared) heating technology is used for improving the heating efficiency, and the important thing is to improve the absorption capacity of the heated material to the radiation, so that the molecular vibration wavelength of the material is matched with the wavelength of the terahertz spectrum.
Disclosure of Invention
The invention aims to provide an intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation, which is high in terahertz radiation intensity generated by sintering and molding of microcrystalline glass through optimization of a tin dioxide electrothermal radiation film formula, and solves the existing problems in the background art by combining a variable-frequency drying system.
In order to solve the technical problems, the terahertz action distance in the invention reaches more than 2 meters, the conversion efficiency is improved to more than 97%, the industrial application power attenuation is less than 3%, and the service life is as long as more than 2 ten thousand hours, and the terahertz action distance is realized by the following technical scheme:
the invention relates to an intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation, which comprises:
the measuring module is used for detecting the current heating temperature and uploading the current heating temperature to the main control module;
a human-machine module for inputting a target heating temperature;
the main control module compares the current heating temperature with a set temperature and obtains a control quantity through an intelligent control algorithm;
and the power control module is used for controlling the radiation intensity of the terahertz heating plate according to the control quantity.
Further, the terahertz heating plate is formed by sintering the modified tin dioxide electrothermal radiation film and microcrystalline glass.
Furthermore, nitrogen elements are doped in the modified tin dioxide electrothermal radiation film, and the percentage content of the nitrogen elements in the tin dioxide film doped with the nitrogen elements is 0.4-0.6.
Further, the preparation process of the modified tin dioxide electrothermal radiation film comprises the following steps:
step S001: respectively placing metallic tin and monocrystalline silicon on a cathode and a sample stage in a vacuum chamber of a magnetron sputtering device, wherein the distance between the metallic tin and a substrate is 5cm, the pressure in the vacuum chamber of the magnetron sputtering device is 1-1.5 Pa, and introducing O2And N2Obtaining a tin nitride film by the mixed gas;
step S002: and placing the tin nitride film in vacuum, and annealing to obtain the nitrogen-doped P-type tin dioxide film.
Further, the measuring module comprises a plurality of temperature sensors arranged on the target drying object.
Further, the method for the main control module to obtain the control quantity through the intelligent control algorithm comprises the following steps:
the method comprises the following steps: acquiring the current heating temperature of the target drying object acquired by each temperature sensor, and respectively marking the current heating temperature as: the real-time temperature wsnj, i is 1, 2, 3, … and n, n is a positive integer, j is 1, 2, 3, … and m, m is a positive integer, and Wsnm represents the temperature value acquired by the temperature sensor n at the mth time;
step two: acquiring a set temperature and marking the set temperature as a set temperature Ws;
step three: comparing the real-time temperature Wsij with the set temperature Ws to obtain a temperature difference value Wci;
step four: when the temperature difference value Wci is not less than X1, acquiring real-time temperature values acquired by the temperature sensor i every time T1;
when the temperature difference value Wci is less than or equal to X2 and less than X1, acquiring a real-time temperature value acquired by the temperature sensor i once every time T2;
step five: repeating the third step to the fourth step;
when the temperature is higher than the set temperature
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: x3 ≦ Wci<At X2, the control amount is adjusted to:
when in use
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: x3 ≦ Wci<At X2, the control amount is adjusted to:
wherein X1, X2, X3, T1, T2, a and b are preset values, T1> T2, and a > b;
ps is the adjusted power, and P is the power before adjustment.
Further, when
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: wci<At X3, the control amount is adjusted to: and when Ps is 0, stopping the operation of the system.
Further, the power control module comprises an optical coupler and a thyristor, the main control module transmits the control quantity to the power control module, the power control module controls the optical coupler, and then the conduction angle of the thyristor is controlled through the optical coupler so as to control the terahertz heating plate.
Further, still include power module, every 8 terahertz hot plates and power module constitute a module now.
Further, the main control module comprises a PIC16F1829-E/ML single chip microcomputer, an external clock circuit and a reset circuit.
The invention has the following beneficial effects:
the target heating temperature is subjected to data exchange with the central control module through RS-485 communication through the man-machine module, the current heating temperature is detected by the temperature sensor, a detected temperature signal is directly converted into a digital signal, the digital signal is transmitted to the central control module and is processed by the central control module, the central control module compares the current heating temperature with the set temperature, a control quantity is given through a certain intelligent control algorithm, the optical coupler is controlled, and then the conduction angle of the thyristor is controlled through the optical coupler, so that the effect of controlling the radiation intensity of the terahertz heating plate is achieved, the heating temperature is adjustable in real time, the requirements of modern high efficiency, green and automation are met, and in the production process, the product quality can be improved due to the characteristic of uniform heating, so that the research has profound significance.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 schematic diagram of the system of the present invention;
fig. 2 is a connection circuit diagram of a communication module;
FIG. 3 is a schematic circuit diagram of distributed zero control of the power control module;
FIG. 4 is a flowchart of a PID control algorithm program using a position type.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "periphery," "side," "end," "bottom," and the like are used in an orientation or positional relationship indicated for ease of description and simplicity of description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered as limiting.
The first embodiment is as follows:
the terahertz heating plate is formed by sintering a modified tin dioxide electrothermal radiation film and microcrystalline glass; implanting a terahertz circuit board into a high-temperature-resistant black microcrystalline glass plate as a heat radiation source, and heating and drying a target object;
as an embodiment provided by the invention, preferably, the modified tin dioxide electrothermal radiation film is doped with nitrogen, the percentage content of nitrogen in the tin dioxide film doped with nitrogen is 0.4-0.6, the terahertz radiation intensity generated by sintering and molding the tin dioxide electrothermal radiation film and microcrystalline glass is high by optimizing the formula of the tin dioxide electrothermal radiation film, the terahertz action distance reaches more than 2 meters, the conversion efficiency is improved to more than 97%, the industrial application power attenuation is less than 3%, and the service life is as long as more than 2 ten thousand hours.
As an embodiment provided by the present invention, preferably, the present invention can improve heating efficiency, improve absorption capacity of a material to radiation, match molecular vibration wavelength thereof with wavelength of a terahertz spectrum, and have advantages of high conversion rate, stable heating, low operation cost, relatively uniform heating, no environmental pollution, and the like, and the preparation process of the modified tin dioxide electrothermal radiation film is as follows:
step S001: respectively placing metallic tin and monocrystalline silicon on a cathode and a sample stage in a vacuum chamber of a magnetron sputtering device, wherein the distance between the metallic tin and a substrate is 5cm, the pressure in the vacuum chamber of the magnetron sputtering device is 1-1.5 Pa, and introducing O2And N2Obtaining a tin nitride film by the mixed gas;
step S002: and placing the tin nitride film in vacuum, and annealing to obtain the nitrogen-doped P-type tin dioxide film.
Example two:
as can be seen from the figure 1, the system takes an 8-bit microprocessor as a core, a human-computer module touch screen exchanges data with a PC (personal computer) through a 485 chip, a target heating temperature can exchange data with the PC through RS-485 communication through input of the touch screen, the current heating temperature can be detected by a temperature-digital converter with a built-in band gap temperature sensor and a sigma-delta analog-to-digital conversion function, an overheat output can be provided, and also can be detected by a temperature detector LM75A temperature sensor, a detected temperature signal is directly converted into a digital signal, the digital signal is transmitted to the microcontroller, and the digital signal is processed by the microcontroller; the microcontroller compares the current heating temperature with the set temperature, gives the control quantity through certain intelligent control algorithm, controls the optocoupler, and then controls the conduction angle of the thyristor through the optocoupler so as to achieve the effect of controlling the radiation intensity of the terahertz heating plate.
The terahertz heating is a radiation heat transfer process, and utilizes infrared rays emitted by a heat object source to irradiate on a heated material, and the infrared rays are absorbed and converted into heat energy to achieve the purpose of heating.
EXAMPLE III
As an embodiment provided by the present invention, preferably, the main control module compares the current heating temperature with a set temperature, and obtains a control amount through an intelligent control algorithm, and the main control module includes a PIC16F1829-E/ML single chip microcomputer, an external clock circuit, and a reset circuit; the reset of the singlechip comprises a power-on reset (POR), a brown-out reset (BOR),
RESET, WDT RESET, RESET instruction, stack overflow, stack underflow, and program mode exit 8 RESET modes
Is the reset mode.
Is an optional external input that can reset the device,
the function is controlled by MCLRE bit of configuration word 1 and LVP bit of configuration word 2, and the specific control mode is shown in Table 1
The configuration is shown. When enabled
When the pin keeps low level, the device can be kept in reset state, the MCLR pin is connected with VDD through internal weak pull-up, and reset can not be carried out
The pin is driven low.
TABLE 1
Configuration of
Tab.2-1 Table of
configuration
As an embodiment provided by the present invention, preferably, the human-machine module is used for inputting a target heating temperature; the invention is based on the modernized, intelligent and simplified model selection concept, and takes an mt6071ie touch screen with display and input functions as a human-computer module; the man-machine module is formed by an mt6071ie touch screen, data exchange is completed between the man-machine module and the single chip microcomputer through RS485 serial communication, the main function is that the man-machine module is used for displaying the current temperature and the set temperature, related hardware setting is needed to be carried out on the touch screen before the touch screen is used, the related hardware setting comprises the setting of a working mode and the setting of a communication port, the man-machine module is provided with a serial communication interface circuit (an RS-485 standard interface is adopted), and MAX13443EASA with the characteristics of the RS-485 data communication interface is selected as a main device of the communication module; the connection circuit diagram of the communication module is shown in fig. 2, pins 1 and 4 of the MAX13443EASA are connected with pins 2 and 3 of the single chip microcomputer, and at the moment, the pins 2 and 3 have the functions of USART asynchronous input and transmission. The 2 and 3 pins of the MAX13443EASA are both connected with the 4 pins of the single chip microcomputer, at the moment, the pin of the single chip microcomputer is a universal I/O port, when the pin is in a low level, the 2 pin is effective, the communication module inputs data of the touch screen into the single chip microcomputer, when the pin is in a high level, the 3 pin is effective, and corresponding data in the single chip microcomputer is transmitted to the touch screen, so that the communication function of the communication module is realized, and data conversion can be carried out between the single chip microcomputer and the touch screen.
As an embodiment provided by the present invention, preferably, the measuring module is configured to detect a current heating temperature and transmit the current heating temperature to the main control module, the measuring module includes a plurality of temperature sensors disposed on the target drying object, the temperature sensor is a contact integrated temperature sensor LM75A, and the temperature sensor has a characteristic that an output is a digital signal, so that an a/D conversion module is omitted from a connection circuit between the temperature sensor and the single chip microcomputer, a circuit is simplified, and a program is simplified.
As an embodiment provided by the present invention, preferably, the power control module controls the radiation intensity of the terahertz heating plate according to a control quantity, the power control module includes an optocoupler and a thyristor, the main control module transmits the control quantity to the power control module, the power control module controls the optocoupler, then controls the conduction angle of the thyristor through an optocoupler to control the terahertz heating plate, the BT138B-800E triac and the TLP168J optoelectronic coupling triac driver used in cooperation therewith are adopted, the distributed zero position control mode circuit diagram adopted in the present invention is shown in fig. 3, the thyristor is used in cooperation with the TLP168J optoelectronic coupling thyristor driver, the operating principle is that the problem that the main circuit where the thyristor is located is an alternating current strong current circuit, the voltage is high, the current is high, and the thyristor is not easily connected directly with the microcomputer is solved by using the optoelectronic isolation function of the TLP168J, the output of the TLP168J is controlled by the output of the I/O port of the TLP168J and the single chip microcomputer, therefore, the on-off time of the thyristor is controlled, and the aim of controlling the power of the terahertz radiation heating equipment is fulfilled finally. .
As an embodiment provided by the invention, preferably, the terahertz heating plate further comprises a power supply module, each 8 terahertz heating plates and the power supply module form a module, the terahertz heating plate only needs a +5V power supply, and a B2405XT-1WR2 power supply with the characteristic of constant voltage input isolation and unstable voltage is selected, wherein the value of B in the power supply model is a product serial number, the value of 24 is 24V, the value of 05 is 5V, the value of XT is a packaging style, and the value of 1WR is a rated output power of 1W.
The single chip microcomputer adopts PIC16F1829, the touch screen adopts mt6071ie, the communication chip adopts MAX13441EASA, the temperature sensor adopts LM75A and the like, which are all common devices, are easy to obtain and have low price. On the premise of meeting design requirements, the element cost is reduced as much as possible.
Example four:
the method for acquiring the control quantity by the main control module through the intelligent control algorithm comprises the following steps:
the method comprises the following steps: acquiring the current heating temperature of the target drying object acquired by each temperature sensor, and respectively marking the current heating temperature as: the real-time temperature wsnj, i is 1, 2, 3, … and n, n is a positive integer, j is 1, 2, 3, … and m, m is a positive integer, and Wsnm represents a temperature value acquired by the temperature sensor n at the mth time;
step two: acquiring a set temperature and marking the set temperature as a set temperature Ws;
step three: comparing the real-time temperature Wsij with the set temperature Ws to obtain a temperature difference value Wci;
step four: when the temperature difference value Wci is not less than X1, acquiring real-time temperature values acquired by the temperature sensor i every time T1;
when the temperature difference value Wci is less than or equal to X2 and less than X1, acquiring a real-time temperature value acquired by the temperature sensor i once every time T2; adjusting the frequency of temperature acquisition in real time to realize variable frequency control;
step five: repeating the third step to the fourth step;
when in use
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: x3 ≦ Wci<At X2, the control amount is adjusted to:
when the temperature is higher than the set temperature
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: x3 ≦ Wci<At X2, the control amount is adjusted to:
wherein X1, X2, X3, T1, T2, a and b are preset values, T1> T2, and a > b;
ps is the adjusted power, and P is the power before adjustment.
As an embodiment provided by the present invention, it is preferable that
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: wci<At X3, the control amount is adjusted to: and when Ps is 0, stopping the operation of the system.
Example five:
the control algorithm adopts a position type PID control algorithm, a program flow chart is shown in FIG. 4, the control algorithm has the advantages of simple structure, good robustness, high reliability, easy parameter setting, independent P, I, D control rules, capability of being combined according to an industrial process, long application period, rich parameter adjustment experience and the like, and the traditional control theory is specifically as follows:
the PID controller forms a deviation e (t) according to a given value r (t) and an actual output value y (t):
e(t)＝r(t)-y(t) (3-1)
linearly combining the proportion, the integral and the differential of the deviation e (t) to form a control quantity, and controlling a controlled object;
the control law is as follows:
in the formula:
kp: coefficient of proportionality
Tf: integral time constant
TD: differential time constant
The PID controller has the following correction links:
1) and (3) proportional links: proportional deviation signal e (t) of reaction control system, once deviation is generated, controller immediately generates control action to reduce deviation;
2) and (3) an integration step: the method is mainly used for eliminating the static error. The strength of the integration depends on an integration time constant, the larger the Tf is, the weaker the integration is, and otherwise, the stronger the integration is;
3) and (3) differentiation: the variation trend (change rate) of the deviation signal can be reflected, and a small early correction signal can be introduced into the system before the value of the deviation signal becomes too large, so that the action speed of the system is accelerated, and the adjustment time is shortened.
Because the control of the invention is sampling control, the control quantity can only be calculated according to the deviation value of the sampling time. Therefore, the integral and differential terms in the expression (3-2) cannot be used directly, discretization is required, T is taken as a sampling period, a series of sampling time points kT represents continuous time T, integration is replaced by accumulation summation approximation, and differentiation is replaced by first-order backward difference approximation, so that the following approximation transformation is performed:
t＝KT (3-4)
wherein, T is a sampling period, e (k) is a deviation value of a system kth sampling time, e (k-1) is a deviation value of a system kth sampling time, k is a sampling serial number, and k is 0, 1, 2. Substituting the above expressions (3-5) and (3-6) into the expression (3-2) can obtain discrete PID expression
If the sampling period T is small enough, the equation can be close to the simulation PID equation, so that the controlled process is close to the continuous control process, and (4-7) is taken as the position type control algorithm of PID.
If in formula (4-7), let:
Then
The expression (4-8) is a programming expression of the discretization position type PID control algorithm. It can be seen that, each time the output is related to all the past states, if u (k) is calculated, not only e (k) and e (k-1) are involved, but also e (j) is added all the time, the calculation amount is large, and the method is suitable for a system with small u (k) change amplitude.
An intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation is characterized in that a target heating temperature is subjected to data exchange with a central control module through a man-machine module through RS-485 communication, the current heating temperature is detected by a temperature sensor, a detected temperature signal is directly converted into a digital signal and transmitted to the central control module, the digital signal is processed by the central control module, the central control module compares the current heating temperature with a set temperature, a control quantity is given through a certain intelligent control algorithm to control an optical coupler, and then the conduction angle of a thyristor is controlled through the optical coupler so as to achieve the effect of controlling the radiation intensity of a terahertz heating plate, so that the heating temperature can be adjusted in real time, the requirements of modern high efficiency, green and automation are met, and in the production process, the product quality can be improved due to the characteristic of uniform heating, and the research has profound significance.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. Terahertz heat radiation-based intelligent constant-temperature variable-frequency drying system is characterized by comprising:
the measuring module is used for detecting the current heating temperature and uploading the current heating temperature to the main control module; the measuring module comprises a plurality of temperature sensors arranged on the target drying object;
a human-machine module for inputting a target heating temperature;
the main control module compares the current heating temperature with a target heating temperature and obtains a control quantity through an intelligent control algorithm;
the power control module is used for controlling the radiation intensity of the terahertz heating plate according to the control quantity;
the method for the main control module to obtain the control quantity through the intelligent control algorithm comprises the following steps:
the method comprises the following steps: acquiring the current heating temperature of the target drying object acquired by each temperature sensor, and respectively marking the current heating temperature as: the real-time temperature wsnj, i is 1, 2, 3, … and n, n is a positive integer, j is 1, 2, 3, … and m, m is a positive integer, and Wsnm represents a temperature value acquired by the temperature sensor n at the mth time;
step two: acquiring a target heating temperature and marking the target heating temperature as a target heating temperature Ws;
step three: comparing the real-time temperature Wsij with the target heating temperature Ws to obtain a temperature difference value Wci;
step four: when the temperature difference value Wci is not less than X1, acquiring a real-time temperature value acquired by the temperature sensor i every time T1;
when the temperature difference value Wci is less than or equal to X2 and less than X1, acquiring a real-time temperature value acquired by the temperature sensor i once every time T2;
step five: repeating the third step to the fourth step;
when in use
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: x3 ≦ Wci<At X2, the control amount is adjusted to:
when in use
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: x3 ≦ Wci<At X2, the control amount is adjusted to:
wherein X1, X2, X3, T1, T2, a and b are preset values, and T1> T2 and a > b;
ps is the adjusted power, and P is the power before adjustment.
2. The intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation as claimed in claim 1, wherein the terahertz heating plate is formed by sintering a modified tin dioxide electrothermal radiation film and microcrystalline glass.
3. The intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation as claimed in claim 2, wherein the modified tin dioxide electrothermal radiation film is doped with nitrogen, and the percentage content of nitrogen in the tin dioxide film doped with nitrogen is 0.4-0.6.
4. The intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation as claimed in claim 3, wherein the preparation process of the modified tin dioxide electrothermal radiation film is as follows:
step S001: respectively placing metallic tin and monocrystalline silicon on a cathode and a sample stage in a vacuum chamber of a magnetron sputtering device, wherein the distance between the metallic tin and a substrate is 5cm, the pressure in the vacuum chamber of the magnetron sputtering device is 1-1.5 Pa, and introducing O2And N2Obtaining a tin nitride film by the mixed gas;
step S002: and placing the tin nitride film in vacuum, and annealing to obtain the nitrogen-doped P-type tin dioxide film.
5. The intelligent constant-temperature variable-frequency drying system based on terahertz heat radiation as claimed in claim 1, wherein:
when the temperature is higher than the set temperature
The temperature difference value Wci corresponding to the real-time temperature value collected by the temperature sensor meets the following requirements: wci<At X3, the control amount is adjusted to: and when Ps is 0, stopping the operation of the system.
6. The intelligent constant-temperature variable-frequency drying system based on terahertz thermal radiation is characterized in that the power control module comprises an optical coupler and a thyristor, the main control module transmits control quantity to the power control module, the power control module controls the optical coupler, and then the conduction angle of the thyristor is controlled through the optical coupler so as to control the terahertz heating plate.
7. The intelligent constant-temperature variable-frequency drying system based on terahertz heat radiation as claimed in claim 1, further comprising a power module, wherein every 8 terahertz heating plates and the power module form a module.
8. The intelligent constant-temperature frequency-conversion drying system based on terahertz thermal radiation as claimed in claim 6, wherein the main control module comprises a PIC16F1829-E/ML single chip microcomputer, an external clock circuit and a reset circuit.
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