CN108089616A - A kind of humidity control system of gauze reactor - Google Patents
A kind of humidity control system of gauze reactor Download PDFInfo
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- CN108089616A CN108089616A CN201711423005.5A CN201711423005A CN108089616A CN 108089616 A CN108089616 A CN 108089616A CN 201711423005 A CN201711423005 A CN 201711423005A CN 108089616 A CN108089616 A CN 108089616A
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- temperature
- power
- thermocouple
- control system
- humidity control
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
Abstract
The invention discloses a kind of humidity control system of gauze reactor, including microcontroller, man-machine interactive system, power governor, gauze reactor and the thermocouple being connected with the wire screen of gauze reactor；Power governor output power heats gauze reactor, microcontroller handles the temperature voltage signal of thermocouple measurement through isolation circuit, and A/D is converted into temperature digital amount, then by handling computing after, as the feedback signal of power governor, the power output of power governor is controlled；Man-machine interactive system and micro-controller communications, setup parameter simultaneously, realize the real-time display of data.The present invention solves the problems such as existing temperature acquisition needs particular power source, control frequency is low, temperature sampling frequency is low, temperature acquisition interference.
Description
Technical field
The present invention relates to temperature acquisition and control field more particularly to a kind of humidity control systems of gauze reactor.
Background technology
Coal is the main energy sources of the world today, is even more critically important primary energy.Trigger with the consumption of the energy
Environmental problem increasingly attracts people's attention, and energy-saving and emission-reduction are still the theme of energy science research, therefore understand coal in depth
Heat utilization and the process and mechanism of harmful substance migration, can be important using providing for the clean and effective of coal in actual industrial
Theoretical foundation.
In order to study the variation of the crystalline nature of coal and chemical phenomenon, slower heating rate is often needed, however industry is raw
The reaction of coal is a quick heating reaction process in production.The examinations such as common horizontal stove, fixed bed, fluid bed and one-dimensional sedimentation furnace
The exploitation of experiment device, the heat utilization process for laboratory research coal provide good experimental method however can not provide one
A wide in range heating rate scope, only wired network reactor can provide a wide in range speed range, and can be effective
Restrain secondary response, more really understand coal heat utilization process and mechanism.Developed gauze emphatically since upper world's sixties
Reactor, such as Imperial College of Britain, by the way of Alternating Current Power Supply, relatively low temperature sampling frequency is 50~60Hz, but can
Control property is not high, and the high frequency that Univ Utah USA realizes power governor using solid-state relay is cut-off, and improves temperature acquisition
And control accuracy, but it is higher to the frequency requirement of solid-state relay, China also accelerates the research work of gauze in this century,
Tsinghua University using dc power adjuster power supply by the way of have developed heating rate can to the experiment porch of 1000 DEG C/s, on
Extra large university of communications can reach 700 DEG C/s, patent based on the experiment porch limit heating rate that LabVIEW is developed
CN106094931 discloses a kind of fast temperature control system towards gauze reactor, provides specific working mode, can
Realize quick heating response device, and limit heating rate can reach 1700 DEG C/s, but all promoted in control accuracy,
But the limit heating rate that can reach is not high.At present gauze temperature of reactor acquisition and control also need to be solved there are some
Certainly the problem of, mainly frequency is low in order to control, temperature sampling frequency is low, temperature acquisition disturbs, limit heating rate is excessively low.
The content of the invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a kind of humidity control system of gauze reactor, with
Solve the problems such as existing temperature acquisition needs particular power source, control frequency is low, temperature sampling frequency is low, temperature acquisition interference.
The humidity control system of a kind of gauze reactor provided by the invention, it is improved in that the temperature is adjusted
System include microcontroller 1, man-machine interactive system 2, power governor 3, gauze reactor 4 and with the gauze reactor 4
The thermocouple 5 of wire screen connection；
3 output power of power governor heats the gauze reactor 4, and the microcontroller 1 is by described in
The voltage signal Compensation Modulation isolation of thermocouple 5 is converted into temperature signal, then by handling computing after, as the power regulation
The feedback signal of device 3 controls the power output of the power governor 3；
The man-machine interactive system 2 communicates with the microcontroller 1, and setup parameter simultaneously, realizes the real-time display of data.
Preferably, the microcontroller 1 includes power supply unit 6, temperature collecting cell 7, master control arithmetic element 8；The master
Controlling arithmetic element 8 includes A/D converter 9 and D/A converter 10；
Said supply unit 6 is communicated by USB interface with the man-machine interactive system 2, and said supply unit 6 is described
Temperature collecting cell 7 and the master control arithmetic element 8 are powered；
Generation temperature potential difference signal is temperature compensated after the temperature collecting cell 7 heats the thermocouple 5, signal
Amplification, DC-DC isolation are input to the master control arithmetic element 8 after generating analog voltage temperature signal, are converted using the A/D
Sequential TTL control square waves and controlled quentity controlled variable are formed after device 9 and D/A converter 10 are converted, after 8 calculating processing of master control arithmetic element
It is transmitted to the power governor 3.
More preferably, the power governor 3 is high-frequency impulse Switching Power Supply, by TTL control square wave drivings, production
Raw pulse square wave, pulse square wave are power output when being in high level, and pulse square wave is power shutdown when being in low level；
The temperature collecting cell 7 carries out temperature acquisition when the pulse square wave is in low level to the thermocouple 5.
More preferably, the line footpath of the thermocouple 5 is less than or equal to 50 μm.
More preferably, said supply unit 6 includes isolation and voltage conversion chip, by the USB of the man-machine interactive system 2
Interface voltage is converted, and is powered for the temperature collecting cell 7 and the master control arithmetic element 8.
More preferably, the man-machine interactive system 2 includes computer；
Setup parameter is needed to include frequency, duty cycle, heating rate, final temperature, residence time.
More preferably, the microcontroller 1 controls the power governor 3 to be less than or equal to for the pulse square wave frequency generated
5kHz。
More preferably, the master control arithmetic element 8 includes main control chip crystal oscillating circuit 14 and reset circuit 15；
The temperature collecting cell 7 will be input to the master after 5 temperature-compensating of thermocouple modulation conversion after DC-DC isolates
Arithmetic element 8 is controlled, digital temperature amount is obtained using the A/D converter 9,10 turns of D/A converter is controlled after being computed processing
It changes, forms the controlled quentity controlled variable of 0-5V and TTL control square waves, the power governor 3 is conveyed to after isolation；
It is multiple by the reset circuit 15 when the equipment initialization operation or crash for the humidity control system occur
Position, program restart to run.
More preferably, the thermocouple 5 has two-way, and the center and peripheral with the gauze reactor 4 is connected respectively.
In technical scheme, it can realize accurate temperature acquisition and the power regulation stablized control, meet line
Net reactor difference final temperature and the temperature acquisition of different heating rate and control requirement, the power governor of the system using entirely every
Wall high frequency pulse power supply, ensure that the heating rate of gauze, while improve the control frequency of power governor so that temperature controls
More precisely, thermocouple carries out temperature acquisition at the power shutdown of pulse square wave, avoids power governor to thermocouple electricity
The interference of kinetic potential, while isolated operation is carried out to thermocouple acquisition signal in microcontroller, it is electronic to avoid microcontroller
The interference of gesture, ensure that the accuracy of temperature acquisition, and the limit heating rate that the present invention can realize is 5000 DEG C/s.
Description of the drawings
Fig. 1 is the system composition schematic diagram of the embodiment of the present invention, and 1 is microcontroller in figure, and 2 be man-machine interactive system, and 3 are
Power governor, 4 be gauze reactor, and 5 be thermocouple；
Fig. 2 is the task scheduling time diagram of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, referring to the drawings and preferred reality is enumerated
Example is applied, the present invention is described in more detail.However, it is necessary to illustrate, many details listed in specification are only to be
Make reader to the one or more aspects of the present invention there are one thorough explanation, it even without these specific details can also
Realize the aspects of the invention.
A kind of humidity control system of gauze reactor provided in this embodiment, composition schematic diagram is as shown in Figure 1, specific
Including microcontroller 1, man-machine interactive system 2, power governor 3, gauze reactor 4 and metal with the gauze reactor 4
The thermocouple 5 of gauze connection；Positive and negative two output terminal of power governor 3 is connected with the positive and negative electrode of gauze reactor 4, for pair
Gauze reactor 4 is heated, and the voltage signal isolation of thermocouple 5 is converted into temperature signal by microcontroller 1, then passes through processing
After computing, as the feedback signal of power governor 3, the power output of control power governor 3；Man-machine interactive system 2 with it is micro-
Controller 1 communicates, and setup parameter simultaneously, realizes the real-time display of data.
Wherein, microcontroller 1 includes power supply unit 6, temperature collecting cell 7, master control arithmetic element 8；Master control arithmetic element 8
Including A/D converter 9, D/A converter 10, main control chip crystal oscillating circuit 14 and reset circuit 15；Power supply unit 6 include isolation and
Conversion chip 16, effect are to convert the USB interface voltage (5V) of man-machine interactive system 2 through AMS1117-3.3 conversion chips
3.3V, USB port 5V are converted through the voltage supplying temperature collecting unit 7 that DC-DC isolating chips are ± 12V by conversion chip
Master control arithmetic element 8 is supplied for the voltage of 3.3V.It is so designed that, isolation processing is carried out to power supply, avoids the noise pair of power supply
The influence that 5 signal modulation process of thermocouple generates.Temperature collecting cell 7 adopts temperature to be stage, including temperature acquisition chip 11, fortune
Calculate amplifier 12 and DC-DC isolating chips 13.Temperature acquisition chip 11 carries out temperature acquisition at the low level of the pulse power, adopts
The AD8495 temperature acquisitions chip 11 that the temperature of collection integrates cold junction compensation through two groups is sent into operational amplification circuit after modulating, and uses
OP2177 operational amplifiers 12 will adopt minimum temperature and maximum temperature in warm scope and be adjusted to be sent into DC-DC for the electric signal of 0-3.3V
Isolating chip 13, the electric signal after isolation enter master control arithmetic element 8, are so designed that, warm letter is adopted to low level thermocouple 5
Number further isolation, effectively prevent the external interference that thermocouple 5 is subject in gatherer process, while avoid temperature collecting cell
The interference of 7 pairs of 5 signals of thermocouple is more really reacted the temperature of gauze reactor and then gauze temperature is carried out more accurate
Adjusting；After the main control chip crystal oscillating circuit 14 of master control arithmetic element 8 receives the signal from temperature collecting cell 7, by 12
After the A/D converter 9 and D/A converter 10 of position are converted, the controlled quentity controlled variable of 0-5V and TTL control square waves are formed, after isolation in real time
Power governor 3 is conveyed to, is so designed that the interference problem that the noise for avoiding microcontroller 1 controls power governor 3.
Power governor 3 is to isolate controllable high-frequency impulse Switching Power Supply, frequency 500-5000Hz, duty cycle 0-100% entirely
It is continuously adjustable, by TTL control square wave drivings, the pulse square wave that frequency is less than 5kHz is generated, when pulse square wave is in high level
For power output, pulse square wave is power shutdown when being in low level, is so chosen so that power governor meets gauze
Heating rate requirement, while low ripple output reduces the noise being loaded on gauze, while it is off state in low level
The online online electrical potential difference that generates of maximum possible less power power supply output influences the measurement of temperature, at the same higher frequency is provided can
To increase the control frequency of the temperature acquisition of thermocouple and microcontroller as far as possible, fine-tuning in order to control provides basis.Such as
Shown in Fig. 2, temperature collecting cell 7 carries out temperature acquisition when pulse square wave is in low level to thermocouple 5.Because power output
There is the property delayed in waveform, compared to control waveform so the temperature acquisition moment should be delayed in the low level of power governor 3
Moment simultaneously because frequency can flood low level wave band higher than the square wave output noise after 5kHz, therefore need to control the frequency of power supply
Rate is not higher than 5kHz, is so designed that the accuracy that ensure that temperature acquisition；
The man-machine interactive system 2 of the present embodiment is compiled by LabVIEW development platforms and generated, specifically, human-computer interaction interface
Frequency, duty cycle, heating rate, final temperature, the setting of residence time can be completed, turning CH340 through USB is transferred to microcontroller 1,
1 acquisition time of microcontroller turns USB transmission to man-machine interactive system 2 with temperature data through CH340 simultaneously, reads micro-control in real time
The information of device 1 processed and display are so designed that, process is simple, and LabVIEW is not involved in controlling to adjust and avoid since LabVIEW is soft
The influence that the limitation of the part speed of service generates temperature control process；
The thermocouple 5 of the present embodiment has two-way, and the center and peripheral with gauze reactor 4 is connected respectively, the line of thermocouple
Footpath is less than or equal to 50 μm, and the temperature that gauze entirety can more really be controlled by being so designed that effectively avoids local temperature from changing to temperature
Control system has an impact, and ensure that the accuracy of acquisition and the control of temperature.The model selection of thermocouple 5 is reacted according to gauze
Material and the working temperature typical selection that the wire screen of device is selected, such as 600~1000 DEG C of selection K-type thermocouples, 1000~
1600 DEG C of selection S type thermocouples.
Gauze is fixed at the electrode both ends of the gauze reactor 4 of the present embodiment, for completing the temperature control program of experiment, tool
Body, the aperture of wire screen is selected to be less than the grain size of test sample, while is also greater than equal to thermocouple for measuring temperature
Line footpath, the material of wire screen are chosen according to operating temperature and requirement of experiment, such as less than 1000 DEG C selection stainless (steel) wires, 1600 DEG C
Molybdenum net or nickel screen are selected below.
Based on above system, the present embodiment is corresponding to provide a kind of temperature control method of gauze reactor, specific steps
Including：
1) microcontroller 1, man-machine interactive system 2 and the initialization of 3 equipment of power governor；
2) microcontroller 1 determines that pid control parameter, gauze reactor 4 adopt warm parameter and allowable error parameter；
3) user inputs setup parameter by the man-machine interactive system 2, including frequency, duty cycle, heating rate, final temperature
And the residence time.The microcontroller 1 controls 3 output power size of power governor according to the setup parameter, to institute
Gauze reactor 4 is stated to be heated；Meanwhile the microcontroller 1 receives the heat being connected with 4 wire screen of gauze reactor
The measured value of galvanic couple 5 is shown by the man-machine interactive system 2；Wherein, the heating rate includes 1 stage heating rate to n
Stage heating rate；Final temperature includes 1 stage final temperature to n stage final temperatures；Residence time stops including 1 stage residence time to the n stages
Stay the time.
4) in order to improve arithmetic speed and control accuracy as far as possible, the microcontroller (1) is controlled using discretization PID
System, the deviation that the measurement obtained according to temperature value set by user and the microcontroller (1) is worth to judges, is adopted at one
In warm area, when the deviation is less than temperature threshold set by user, next temperature of adopting for adopting thermoperiod is carried out, is otherwise repaiied
Change carry out after the influence temperature change precision parameter error amount in discretization PID it is next adopt thermoperiod adopt temperature, realize PID's
Closed-loop control；Specifically, the formula of the influence temperature change precision parameter error amount in modification discretization PID includes：
eej=k1*tn+k2*mn+k3*em
In formula, eejTo influence temperature change precision parameter error；k1For the coefficient that heats up；tnFor heating rate affecting parameters；
k2For gauze temperature coefficient；mnFor gauze temperature-responsive time parameter；k3For error coefficient；emFor temperature set by user
The error affecting parameters for the measured value that value is obtained with the microcontroller 1；
Determine that discretization PID control is：
In formula, UkFor temperature scaling factor magnitude；KpFor the proportionality constant of proportional；KiFor the proportionality constant of integral term；Kd
For the proportionality constant of differential term；K is gain coefficient；eKFor in the deviation of n-th sampling instant；eK-1For in (n-1)th sampling
The deviation at moment；J is time variable, is represented at different moments；The wherein deviation e of n-th sampling instantKExpression formula is：
eK=SV-PV
In formula, SVFor temperature value set by user；PVThe measured value of thermocouple 5 is received for the microcontroller 1.
5) step 4) is repeated, until reaching or the threshold temperature less than setting, is terminated.
By taking the control program of 5kHz as an example, specific man-machine interactive system 2 will heat up rate, keep temperature, multistage parameter,
The parameters such as final temperature are downloaded into microcontroller 1, opening temperature control, with calculating temperature in the unit interval according to user's download parameters
The Delta Time of rising amount, minimum temperature time can be in 0.2ms.Microcontroller 1 exports TTL control square wave driving powers adjuster 3
Start, the duty cycles of TTL square waves is arranged to 60%, and in method, temperature is filtered and asked after being sampled as 50 data conversions every time
Average value processing, by collection point temperature compared with user's design temperature, is obtained instantaneous point deviation, with reference to discretization recited above
Parameter is switched to electric current and voltage control quantity by PID control, and user can set different pid parameters, and closed loop thermal sound is adjusted
Situation should be fluctuated with temperature following, control power defeated by D/A analog-digital converters, realize fully closed heating and holding temperature control
System.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of humidity control system of gauze reactor, which is characterized in that the humidity control system includes microcontroller
(1), man-machine interactive system (2), power governor (3), gauze reactor (4) and the metal wire with the gauze reactor (4)
Net the thermocouple (5) of connection；
Power governor (3) output power heats the gauze reactor (4), and the microcontroller (1) is by institute
The voltage signal isolation for stating thermocouple (5) is converted into temperature signal, then by handling computing after, as the power governor
(3) feedback signal controls the power output of the power governor (3)；
The man-machine interactive system (2) communicates with the microcontroller (1), and setup parameter simultaneously, realizes the real-time display of data.
2. humidity control system as described in claim 1, which is characterized in that the microcontroller (1) includes power supply unit
(6), temperature collecting cell (7), master control arithmetic element (8)；The master control arithmetic element (8) includes A/D converter (9) and D/A
Converter (10)；
Said supply unit (6) is communicated by USB interface with the man-machine interactive system (2), and said supply unit (6) is institute
State temperature collecting cell (7) and the master control arithmetic element (8) power supply；
Generation temperature potential difference signal is temperature compensated after the temperature collecting cell (7) heats the thermocouple (5), signal
Amplification, DC-DC isolation are input to the master control arithmetic element (8) after generating analog voltage temperature signal, turn using the A/D
After parallel operation (9) and D/A converter (10) conversion, sequential TTL control square waves are formed after master control arithmetic element (8) calculating processing
The power governor (3) is transmitted to controlled quentity controlled variable.
3. humidity control system as described in claim 1, which is characterized in that the power governor (3) is opened for high-frequency impulse
Powered-down source by TTL control square wave drivings, generates pulse square wave, it is usually power output that it is high, which to be in electricity, for pulse square wave, arteries and veins
It is power shutdown to rush when square wave is in low level；
The temperature collecting cell (7) carries out temperature acquisition when the pulse square wave is in low level to the thermocouple (5).
4. humidity control system as claimed in claim 3, which is characterized in that the line footpath of the thermocouple (5) is less than or equal to 50 μ
m。
5. humidity control system as claimed in claim 2, which is characterized in that said supply unit (6) includes isolation and voltage
Conversion chip is the temperature collecting cell (7) and the master by the USB interface voltage conversion of the man-machine interactive system (2)
Arithmetic element (8) is controlled to power.
6. humidity control system as claimed in claim 5, which is characterized in that the man-machine interactive system (2) includes computer；
Setup parameter is needed to include frequency, duty cycle, heating rate, final temperature, residence time.
7. humidity control system as claimed in claim 2, which is characterized in that the microcontroller (1) controls the power tune
The pulse square wave frequency that device (3) is saved to generate is less than or equal to 5kHz.
8. humidity control system as claimed in claim 5, which is characterized in that the master control arithmetic element (8) includes master control core
Piece crystal oscillating circuit (14) and reset circuit (15)；
The temperature collecting cell (7) will be input to the master after thermocouple (5) temperature-compensating modulation conversion after DC-DC isolates
Arithmetic element (8) is controlled, digital temperature amount is obtained using the A/D converter (9), D/A converter is controlled after being computed processing
(10) convert, form the controlled quentity controlled variable of 0-5V and TTL control square waves, the power governor (3) is conveyed to after isolation；
When the equipment initialization operation or crash for the humidity control system occur, pass through the reset circuit (15) and reset.
9. humidity control system as described in claim 1, which is characterized in that the thermocouple (5) has two-way, respectively with it is described
The center and peripheral connection of gauze reactor (4).
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| CN201711423005.5A CN108089616B (en) | 2017-12-25 | 2017-12-25 | Temperature regulating system of wire-grid reactor |
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| CN201711423005.5A CN108089616B (en) | 2017-12-25 | 2017-12-25 | Temperature regulating system of wire-grid reactor |
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