CN103217010B - Control system of material dryer device - Google Patents
Control system of material dryer device Download PDFInfo
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- CN103217010B CN103217010B CN201310119707.XA CN201310119707A CN103217010B CN 103217010 B CN103217010 B CN 103217010B CN 201310119707 A CN201310119707 A CN 201310119707A CN 103217010 B CN103217010 B CN 103217010B
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Abstract
The invention provides a control system of a material drier device. The control system is used for sampling a moisture measured value, a temperature measured value on the side surface of the dryer and an outlet air temperature measured value and an outlet air speed measured value of a hot air blower by utilizing a sampling unit; an outlet moisture control unit is used for modifying an outlet air temperature set value of the hot air blower, an outlet air speed set value of the hot air blower and a dryer surface temperature set value according to the changes of the sampled moisture measured value of the material outlet and the moisture measured value of the material inlet; a steam valve control unit is used for controlling the opening-closing size of the steam valve according to the difference of the dryer surface temperature set value and the sampled temperature measured value; and a hot air blower control unit is used for controlling the hot air blower to change the outlet air temperature according to the difference of the outlet air temperature set value and the sampled outlet air temperature measured value, and controlling the hot air blower to change the outlet air speed according to the difference of the outlet air speed set value and the sampled outlet air speed measured value.
Description
Technical field
The present invention relates to a kind of control system of material drier device.
Background technology
Material drier device is mainly used in the oven dry of the material such as tobacco, dried food and nuts.Its equipment is just as an accumbency cylinder, and inside is hollow cavity, and vapours flows into from one end of cavity and equipment heated and forms steam condensate (SC) to flow out from the other end again.Also there is steam at one end to flow into after cavity Inner eycle again from the design that same one end is flowed out simultaneously.Along with equipment rotates, the l Water Paper moisture being close to the equipment surface heated by vapours is evaporated, and then enters next process.Therefore this rotary drying firing equipment is also referred to as drying cylinder usually.
In order to make the moisture after oven dry control in the scope of technological requirement, need this drying cylinder operation applied moisture automatic control system.In order to realize a control system, need the key process parameter of Measurement accuracy controlled device, as the reconstituted tobacoo moisture after drying cylinder heat drying, the surface temperature etc. of drying cylinder cylinder body; The required controlled quentity controlled variable regulated is exported by Controlling model program computation after collecting these data; And executing agency has been exactly the final equipment of controlled quentity controlled variable output action, thus form a closed loop feedback automatic control system.
In the control system of drying cylinder, be the most directly the moisture content of outlet control loop of material, but this loop directly not can be used as the executing agency controlling to export, and needs the control of the control realization moisture content of outlet such as temperature, air-out speed by means of drying cylinder.But, on actual production line, this control system can only be single the temperature of control drying cylinder or air-out speed, for the material of tobacco, because the humidity range inputting material is very large, and require very high to the humidity of materials after drying, a kind of influence factor only in control drier device can not meet the humidity requirement of the material after oven dry, make the tobacco quality after drying uneven, add poor product rate.
In addition, because drying cylinder is in rotation status in process of production all the time, and cylinder surface cover by reconstituted tobacoo paper, therefore the Measurement accuracy of rotary equipment surface temperature be always one by the problem widely discussed.At present, more common temperature survey mode is infrared thermography method.This method is installation infrared temperature sensor in the certain limit of distance measured object surface, utilizes the thermal effect of radiation of object, after making detecting element receiver radiation, after transmitter conversion, obtains measuring tempeature.But cigarette slurry is manufactured paper with pulp in drying forming process at use drying cylinder by reconstituted tobacoo technique, a large amount of rising water vapour can be produced, the as easy as rolling off a log true temperature covering dryer surface of water vapour, cause the temperature reliability of measurement very low.Meanwhile, the dust that reconstituted tobacoo processing site flies upward in a large number is also easy to the infrared probe of contaminant sensor.
Therefore, need to improve existing drying cylinder control system.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of control system of material drier device, control system for solving drier device in prior art cannot meet the moisture requirement that tobacco is dried, and the problem such as in existing control system the temperature survey of dryer surface is inaccurate.
For achieving the above object and other relevant objects, the invention provides a kind of control system of material drier device, wherein, drier device comprises: material outlet, material inlet, the drum dryer be connected with material gateway, for drying the air-heater of the tobacco on described drying cylinder, and for discharging the steam valve of moisture in drying cylinder, described control system at least comprises: sampling unit, for the moisture measurement value of described material outlet of sampling, the moisture measurement value of material inlet, the measured temperature of described drying cylinder side surface, the leaving air temp measured value of described air-heater and air-out velocity measurement, the moisture content of outlet control unit be connected with described sampling unit, for revising the leaving air temp setting value of described air-heater, the air-out speed setting value of air-heater and surface temperature of drier setting value according to the change of the moisture measurement value of sampled material outlet, the moisture measurement value of material inlet, the steam valve control unit be connected with described sampling unit and moisture content of outlet control unit, for controlling the folding size of described steam valve according to described surface temperature of drier setting value and the difference of the measured temperature of sampling, to adjust the steam pressure in drying cylinder, the air-heater control unit be connected with described sampling unit and moisture content of outlet control unit, changes leaving air temp for controlling described air-heater according to described leaving air temp setting value with the difference of leaving air temp measured value of sampling, and control described air-heater according to air-out speed setting value and the difference of air-out velocity measurement of sampling and change air-out speed.
Preferably, described sampling unit comprises:
For at least one the first temperature sampling module of described drying cylinder side surface measured temperature of sampling, comprising:
Be attached at the temperature sensor of the side surface between described drying cylinder bottom surface and the drying materials district of drying cylinder side surface;
Be arranged on described temperature sensor rear end and described temperature sensor be pressed in the spring assembly of described drying cylinder side surface;
For the rotating speed sampling module of the rotating speed measured value of described air-heater of sampling;
For the second temperature sampling module of the leaving air temp measured value of described air-heater of sampling;
For the Moisture Meter of the moisture measurement value of sample described material outlet and material inlet.
Preferably, described temperature sensor is wired contact type temperature sensor.
Preferably, described moisture content of outlet control unit comprises: the feed-forward compensation module be connected with described sampling unit, for utilizing PI control algolithm to carry out the real-time compensation budget moisture measurement value of sampled material inlet being carried out to the control hysteresis of material in drying course, and export budget result; The moisture content of outlet control module be connected with described sampling unit and feed-forward compensation module, for utilizing default PID control algorithms to the control component of the moisture content of outlet corresponding to the difference determining material outlet moisture setting value and the moisture measurement value of material outlet of sampling, and revise the leaving air temp setting value of air-heater, the air-out speed setting value of air-heater and surface temperature of drier setting value according to described control component and budget result.
Preferably, described moisture content of outlet control module also obtains considering the controlled quentity controlled variable compensating budget for the weight shared separately according to described control component and budget result, and described controlled quentity controlled variable is carried out amplification computing with the amplification coefficient of the leaving air temp setting value of air-heater, the air-out speed setting value of air-heater and the surface temperature of drier setting value preset respectively, obtain the leaving air temp setting value of revised air-heater, the air-out speed setting value of air-heater and surface temperature of drier setting value.
Preferably, described steam valve control unit comprises: the first temperature transmitter be connected with temperature sensor described in each, and the measured temperature for sampling according to each described temperature sensor determines the measured temperature in the drying materials district of described drying cylinder side surface; The steam valve control module be connected with described first temperature transmitter, multiple measured temperatures for obtaining according to multiple repairing weld carry out pid control computation, to obtain the controlled quentity controlled variable of described steam valve, and control the opening degree of described steam valve according to the controlled quentity controlled variable of described steam valve.
Preferably, described air-heater control unit comprises: the wind speed transducer be connected with described rotating speed sampling module, according to the rotating speed of air-heater preset and the corresponding relation of air-out speed the rotating speed measured value of sampled air-heater is converted to the air-out velocity measurement of described air-heater; The the first air-heater control module be connected with described wind speed transducer, multiple described air-out velocity measurement for obtaining according to multiple repairing weld carries out pid control computation, to obtain the controlled quentity controlled variable of the air supply motor in described air-heater, and control the power output of described air supply motor according to the controlled quentity controlled variable of described air supply motor.
Preferably, described air-heater control unit comprises: with the second temperature transmitter of described second temperature sampling model calling, for the leaving air temp measured value of sampled air-heater is carried out digitlization and amplification; The the second air-heater control module be connected with described second temperature transmitter, multiple leaving air temp measured values for obtaining according to multiple repairing weld carry out pid control computation, to obtain the controlled quentity controlled variable of the heater in described air-heater, and control the power output of described heater according to the controlled quentity controlled variable of described heater.
As mentioned above, the control system of material drier device of the present invention, there is following beneficial effect: each measured value relevant to moisture content of outlet in real-time sampling drier device, and by moisture content of outlet control unit according to measured value and default Controlling model and control circuit to air-heater control unit, steam valve control unit provides corresponding setting value, and by air-heater control unit, steam valve control unit controls corresponding air-heater and steam valve according to the difference of sampled measured value and setting value separately, so the multiple devices in the drier device relevant to drying materials moisture are controlled simultaneously, ensure that the maximum deviation of material outlet moisture controls within 1.5%.
Accompanying drawing explanation
Fig. 1 is shown as the material drier device structural representation of prior art.
Fig. 2 is shown as the structural representation of the control system of material drier device of the present invention.
Fig. 3 is shown as the structural representation of the first temperature sampling module in the control system of material drier device of the present invention.
Detailed description of the invention
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this description can understand other advantages of the present invention and effect easily.
Refer to Fig. 1 to Fig. 3.Notice, structure, ratio, size etc. that this description institute accompanying drawings illustrates, content all only in order to coordinate description to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, quote in this description as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
The invention provides a kind of control system of material drier device.Described control system, for controlling the moisture of the tobacco of drying in drier device, makes the water tariff collection of the tobacco after oven dry in specified scope, to improve the quality of tobacco.Wherein, as shown in Figure 1, described drier device comprises: material outlet 23, material inlet 21, the drum dryer 22 be connected with material in/out mouth, for drying the air-heater 25 of the tobacco on described drying cylinder and the steam valve 24 for discharging dryer surface moisture.Wherein, described air-heater comprises heater and air supply motor.As shown in Figure 2, described control system comprises: sampling unit 11, moisture content of outlet control unit 12, air-heater control unit 14, steam valve control unit 13.
Described sampling unit 11 is for the moisture measurement value of the moisture measurement value of described material outlet 23 of sampling, material inlet 21, the measured temperature of described drying cylinder 22 side surface, the leaving air temp measured value of described air-heater 25 and air-out velocity measurement.
Particularly, described sampling unit 11 comprises: the first temperature sampling module, rotating speed sampling module, the second temperature sampling module and Moisture Meter.
Described first temperature sampling module is for described drying cylinder side surface measured temperature of sampling.Its quantity can be one also can be multiple.As shown in Figure 3.Described first temperature sampling module comprises: temperature sensor 111 and spring assembly 112.
Particularly, described temperature sensor 111 is attached at the side surface between described drying cylinder bottom surface and the drying materials district of drying cylinder side surface.Described temperature sensor 111 is mainly contact type temperature sensor.Described contact type temperature sensor is preferably wired contact type temperature sensor.
Described spring assembly 112 is arranged on described temperature sensor 111 rear end and described temperature sensor 111 is pressed in described drying cylinder side surface.Wherein, described spring assembly 112 can comprise spring or spring leaf.
Particularly, described spring assembly 112 is fixed on the support of described drying cylinder, and the spring in described spring assembly 112 is by the crimp of described temperature sensor 111, and described temperature sensor 111 is close to the side surface of drying cylinder 22 by the active force of spring.When described drying cylinder 22 rotates, the side surface of described temperature sensor 111 and described drying cylinder 22 is to friction, therefore described temperature sensor 111 can be worn, but due to the active force of spring, can not gap be produced between the side surface of temperature sensor 111 and described drying cylinder 22, therefore the measured temperature of described side surface can be measured exactly.
Described rotating speed sampling module is for the rotating speed measured value of described air-heater of sampling.
Particularly, described rotating speed sampling module is connected with the air supply motor of described air-heater, calculates the current rotating speed of described air supply motor by obtaining the parameters such as the power output of air supply motor.The hardware of described rotating speed sampling module comprises: be connected with air supply motor and export for obtaining air supply motor the signal of telecommunication sampling resistor, to be connected with sampling resistor and DSP for calculating the current rotating speed of air supply motor according to preset formula.
Described second temperature sampling module is for the leaving air temp measured value of air-heater of sampling.Particularly, described second temperature sampling module is positioned at the air outlet of described air-heater, to obtain the leaving air temp measured value of the air outlet of air-heater.Described second temperature sampling module can be non-contact temperature sensor.
Described Moisture Meter lays respectively at material outlet and material inlet, for the moisture measurement value of sample described material outlet and material inlet.
Described moisture content of outlet control unit 12 is connected with described sampling unit 11, for revising the leaving air temp setting value of described air-heater, the air-out speed setting value of air-heater and surface temperature of drier setting value according to the change of the moisture measurement value of sampled material outlet, the moisture measurement value of material inlet.
Particularly, the moisture measurement value of material inlet, the moisture measurement value of material outlet that default material inlet, material outlet moisture setting value are sampled with described Moisture Meter by described moisture content of outlet control unit 12 respectively do mathematic interpolation, again according to the corresponding difference preset interval respectively with the segmentation corresponding relation of leaving air temp setting value, air-out speed setting value and surface temperature of drier setting value, determine each setting value corresponding to obtained difference.
Preferably, described moisture content of outlet control unit 12 comprises: feed-forward compensation module, moisture content of outlet control module.
Described feed-forward compensation module is connected with the Moisture Meter of described material inlet, for utilizing PI control algolithm to carry out the real-time compensation budget moisture measurement value of sampled material inlet being carried out to the control hysteresis of material in drying course, and exports budget result.Wherein, described feed-forward compensation module is the module can carrying out large numerical quantity, logical operation according to the program preset, and it includes but not limited to: processor, FPGA, DSP etc.
Particularly, described feed-forward compensation module utilizes formula (1):
compensate budget, wherein, T
infor the moisture measurement value of material inlet, preferably, T
infor comprising the matrix of the moisture measurement value of material inlet, drying cylinder rotating speed, gas hood hot blast temperature, gas hood hot blast wind speed,
represent the inertial element of described feed-forward compensation module, e
-τ srepresent delayed (delay) link of described feed-forward compensation module, Kp represents proportional component (i.e. proportionality coefficient), Y
1s result that () is budget, described feed-forward compensation module is by Y
1s () is exported.
Described moisture content of outlet control module is connected with the Moisture Meter of described feed-forward compensation module and described material outlet, for utilizing default PID control algorithms to the control component of the material outlet moisture corresponding to the difference determining material outlet moisture setting value and the moisture measurement value of material outlet of sampling, and revise the leaving air temp setting value of air-heater, the air-out speed setting value of air-heater and surface temperature of drier setting value according to described control component and budget result.Wherein, the processor that described moisture content of outlet control module comprises subtracter and is connected with described subtractor outputs, described processor is mainly a kind of module can carrying out large numerical quantity, logical operation according to the program preset, and it includes but not limited to: FPGA, single-chip microcomputer etc.
Particularly, described moisture content of outlet control module utilizes formula (2):
calculate the control component of material outlet moisture, wherein,
for PID control parameter coefficient, △ T
outfor material outlet moisture setting value and the difference of the moisture measurement value of the material outlet of sampling, Y
2s () is for controlling component;
Then, described moisture content of outlet control module according to control component and the budget result preset separately shared by weight obtain considering the controlled quentity controlled variable compensating budget, and described controlled quentity controlled variable is carried out amplification computing with the amplification coefficient of the leaving air temp setting value of air-heater, the air-out speed setting value of air-heater and the surface temperature of drier setting value preset respectively, obtain the leaving air temp setting value of revised air-heater, the air-out speed setting value of air-heater and surface temperature of drier setting value.
Such as, the weight of described control component is 0.7, the weight of budget result is 0.3, then described moisture content of outlet control module obtains controlled quentity controlled variable Y (s) for 0.7*Y2 (s)+0.3*Y1 (s), the amplification coefficient of the leaving air temp setting value of the air-heater that basis is default is 5.3 again, the leaving air temp setting value obtaining air-heater is Y (s) * 5.3, similar, the amplification coefficient of the air-out speed setting value of the air-heater preset is 0.5, the air-out speed setting value obtaining air-heater is Y (s) * 0.5, the amplification coefficient of the surface temperature of drier setting value preset is 20, obtaining surface temperature of drier setting value is Y (s) * 20.
Described steam valve control unit 13 is connected with described sampling unit 11 and moisture content of outlet control unit 12, for controlling the folding size of described steam valve according to described surface temperature of drier setting value and the difference of the measured temperature of sampling, to adjust the steam pressure in drying cylinder.
Particularly, described steam valve control unit 13 presets the corresponding relation of described surface temperature of drier difference interval and described steam valve opening degree, and determine obtained described surface temperature of drier setting value and the difference of measured temperature of sampling are in which temperature gap interval range, determine the steam valve opening degree corresponding to relevant temperature difference interval again, and send corresponding control instruction to described steam valve, such as, when under control instruction, opening degree becomes large described steam valve, steam pressure in described drying cylinder from large to small, so can discharge more moisture in drying cylinder.
Preferably, described steam valve control unit 13 comprises: the first temperature transmitter, steam valve control module.
Described first temperature transmitter is connected with the first temperature sensor described in each, and the measured temperature for sampling according to each described first temperature sensor determines the measured temperature in the drying materials district of described drying cylinder side surface.
Particularly, the measured temperature that the first temperature sensor that described first temperature transmitter obtains described drying cylinder side surface diverse location is sampled, and sampled all measured temperatures are carried out modeling, to simulate the measured temperature of the drying area covering material according to the temperature model of the drying cylinder side surface preset.
Described steam valve control module is connected with described first temperature transmitter, multiple measured temperatures for obtaining according to multiple repairing weld carry out pid control computation, to obtain the controlled quentity controlled variable of described steam valve, and control the opening degree of described steam valve according to the controlled quentity controlled variable of described steam valve.
Particularly, the measured temperature that continuous three samplings obtain is substituted into formula (3) by described steam valve control module:
Obtain the controlled quentity controlled variable of described steam valve, and according to the corresponding relation of opening degree of the controlled quentity controlled variable preset and steam valve, described controlled quentity controlled variable is converted to the corresponding control instruction to described steam valve, to control the opening and closing degree of described steam valve, keep stable to make the water vapour content in drying cylinder.Wherein, Y (t)
k1for the controlled quentity controlled variable that current described steam valve control module exports, Y (t)
k1-1for the controlled quentity controlled variable that steam valve control module described in the last cycle exports, E
1for the error represented with sampled range of temperature percentage, particularly, E
1=(kth 1 measured temperature-desired temperature)/desired temperature-((k1-1) individual measured temperature-desired temperature)/desired temperature, Δ E
1for (E
k1-E
k1-1), Δ t
1for circuit controls update time, K
p1for proportional gain factor, K
i1for integration gain factor, K
d1for differential gain coefficient.Wherein, K
p1=0.8, K
i1=90, K
d1=5.
Described air-heater control unit 14 is connected with described sampling unit 11 and moisture content of outlet control unit 12, changes leaving air temp for controlling described air-heater according to described leaving air temp setting value with the difference of leaving air temp measured value of sampling, and control described air-heater according to air-out speed setting value and the difference of air-out velocity measurement of sampling and change air-out speed.
Particularly, described air-heater control unit 14 prestores the corresponding relation of the excursion of leaving air temp and the heating power of air-heater, and the corresponding relation of the power output of the excursion of air-out speed and the air supply motor of air-heater, the heating power corresponding to difference of described leaving air temp setting value and the leaving air temp measured value of sampling then is determined according to the excursion of leaving air temp prestored, and send temperature control instruction to described air-heater, change heating power to make described air-heater; Simultaneously, described air-heater control unit 14 determines the power output of described air-out speed setting value and the air supply motor corresponding to the difference of air-out velocity measurement of sampling according to the excursion of the air-out speed prestored, and send power control instruction to described air-heater, with the power output making described air-heater change air supply motor.
Described air-heater control unit 14 preferably includes: wind speed transducer, the first air-heater control module, the second temperature transmitter, the second air-heater control module.
Described wind speed transducer is connected with described rotating speed sampling module, and the rotating speed measured value of sampled air-heater is converted to the air outlet velocity measured value of described air-heater by the rotating speed of air-heater preset for basis and the corresponding relation of air outlet velocity;
Such as, the four groups of rotating speeds of prestoring in described wind speed transducer interval respectively with the corresponding relation of the air outlet velocity of described air-heater, and determine obtained rotating speed measured value is in which rotating speed interval, then determine the air outlet velocity measured value corresponding to corresponding rotating speed interval.
And for example, the linear relation of described wind speed transducer preset rotation speed and air outlet velocity measured value, and the air outlet velocity measured value according to described relational expression, the rotating speed measured value of sampled air-heater being converted to described air-heater.
Described first air-heater control module is connected with described wind speed transducer, multiple described air-out velocity measurement for obtaining according to multiple repairing weld carries out pid control computation, to obtain the controlled quentity controlled variable of the air supply motor in described air-heater, and control the power output of described air supply motor according to the controlled quentity controlled variable of described air supply motor.
Particularly, the air-out velocity measurement that continuous three samplings obtain is substituted into formula (4) by described first air-heater control module:
Obtain the controlled quentity controlled variable of the air-out speed of described air-heater, and according to the corresponding relation of power output of air supply motor in the controlled quentity controlled variable preset and air-heater, described controlled quentity controlled variable is converted to the corresponding control instruction to described air supply motor, to control the power output of described air supply motor.Wherein, Y (t)
k2for the controlled quentity controlled variable that current described first air-heater control module exports, Y (t)
k2-1for the controlled quentity controlled variable that the first air-heater control module described in the last cycle exports, E
2for the error represented with sampled air-out speed variation percentage, particularly, E
2=(kth 2 air-out velocity measurement-air-out speed setting values)/air-out speed setting value-((k2-1) individual air-out velocity measurement-air-out speed setting value)/air-out speed setting value, Δ E
2for (E
k2-E
k2-1), Δ t
2for circuit controls update time, K
p2for proportional gain factor, K
i2for integration gain factor, K
d2for differential gain coefficient.Wherein, K
p2=0.4, K
i2=10, K
d2=2.
Described second temperature transmitter and described second temperature sampling model calling, for carrying out digitlization and amplification by the leaving air temp measured value of sampled air-heater.
Particularly, the leaving air temp measured value that described second temperature sampling module is sampled is analog signal, then described second temperature transmitter converts described analog signal to data signal, and amplifies, to be met the data signal of the input requirements of the second air-heater control module.
Multiple leaving air temp measured values that described second air-heater control module is used for obtaining according to multiple repairing weld carry out pid control computation, to obtain the controlled quentity controlled variable of the heater in described air-heater, and control the power output of described heater according to the controlled quentity controlled variable of described heater.
Particularly, the leaving air temp measured value that continuous three samplings obtain is substituted into formula (5) by described second air-heater control module:
Obtain the controlled quentity controlled variable of the leaving air temp of described air-heater, and according to the corresponding relation of power output of heater in the controlled quentity controlled variable preset and air-heater, described controlled quentity controlled variable is converted to the corresponding control instruction to described heater, to control the power output of described heater.Wherein, Y (t)
k3for the controlled quentity controlled variable that current described second air-heater control module exports, Y (t)
k3-1for the controlled quentity controlled variable that the second air-heater control module described in the last cycle exports, E
3for the error represented with sampled leaving air temp excursion percentage, particularly, E
3=(kth 3 leaving air temp measured value-leaving air temp setting values)/leaving air temp setting value-((k3-1) individual leaving air temp measured value-leaving air temp setting value)/leaving air temp setting value, Δ E
3for (E
k3-E
k3-1), Δ t
3for circuit controls update time, K
p3for proportional gain factor, K
i3for integration gain factor, K
d3for differential gain coefficient.Wherein, K
p3=0.5, K
i3=25, K
d3=3.
The course of work of described control system is as follows:
Described sampling unit is sampled the moisture measurement value of described material outlet, the moisture measurement value of material inlet, the measured temperature of described drying cylinder side surface, the leaving air temp measured value of described air-heater and air-out velocity measurement, and sampled each measured value is packaged together, be defeated by moisture content of outlet control unit, steam valve control unit and air-heater control unit;
The moisture measurement value of sampled material inlet is substituted into formula (1) to obtain the result of the compensation budget for control hysteresis by the feed-forward compensation module in described moisture content of outlet control unit, and described budget result is supplied to moisture content of outlet control module, the moisture measurement value of sampled material outlet is first substituted into formula (2) by described moisture content of outlet control module, obtain controlling component, and according to controlling the weight relationship of component and budget result, obtain the controlled quentity controlled variable considering budget result, simultaneously, according to steam valve in dryer, heater in air-heater, effect size is worked to obtain in each comfortable material drying of air supply motor in air-heater, described controlled quentity controlled variable is amplified in the ratio preset, to obtain the leaving air temp setting value of air-heater respectively, the air-out speed setting value of air-heater, and surface temperature of drier setting value, and by the leaving air temp setting value of air-heater, the air-out speed setting value of air-heater transports to air-heater control unit, surface temperature of drier setting value is transported to steam valve control unit,
Measured measured temperature is given the first temperature transmitter by wire transmission by the temperature sensor being attached to drying cylinder side surface in described steam valve control unit, calculated the measured temperature in material drying region in drying cylinder side surface according to pre-established temperature model by the first temperature transmitter, and obtained measured temperature is supplied to steam valve control module, obtain according to the measured temperature repeatedly obtained and formula (3) controlled quentity controlled variable controlling steam valve opening degree by described steam valve control module, and control the opening degree of steam valve in real time;
Wind speed transducer in described air-heater control unit converts the rotating speed measured value of air supply motor in sampled air-heater to air-out velocity measurement, and obtained the controlled quentity controlled variable of the power output controlling air supply motor according to the air-out velocity measurement repeatedly obtained and formula (4) by the first hot blast control module, and control the power output of air supply motor in real time;
Simultaneously, the leaving air temp measured value of sampled air-heater is carried out digitlization and amplification by the second temperature transmitter in described air-heater control unit, to be met the leaving air temp measured value of subtracter input requirements in the second air-heater control module, and obtained the controlled quentity controlled variable of the power output of control heater by the second air-heater control module according to the leaving air temp measured value repeatedly obtained and formula (5), and the power output of real-time control heater.
In sum, the control system of material drier device of the present invention, each measured value relevant to moisture content of outlet in real-time sampling drier device, and by moisture content of outlet control unit according to measured value and default Controlling model and control circuit to air-heater control unit, steam valve control unit provides corresponding setting value, and by air-heater control unit, steam valve control unit controls corresponding air-heater and steam valve according to the difference of sampled measured value and setting value separately, so the multiple devices in the drier device relevant to drying materials moisture are controlled simultaneously, ensure that the maximum deviation of material outlet moisture controls within 1.5%, in addition, feed forward compensation mechanisms is added in moisture content of outlet control unit, the lag factor of control system in drying course can be predicted, upgrade in time each setting value thus, so that the control instruction of change air-heater control unit, the output of steam valve control unit in time, increases the stability of material moisture content of outlet so further, in addition, temperature sensor in first temperature sampling module is positioned over the side surface between described drying cylinder bottom surface and the drying materials district of drying cylinder side surface, the temperature of side surface can be measured accurately, simultaneous temperature sensor adopts wired temperature sensor, can avoid because drying environment is severe, the shortcoming that the signal of radio temperature sensor cannot accurately obtain.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (8)
1. the control system of a material drier device, wherein, drier device comprises: material outlet, material inlet, the drum dryer be connected with material gateway, for drying the air-heater of the tobacco on described drying cylinder and the steam valve for discharging moisture in drying cylinder, it is characterized in that, described control system at least comprises:
Sampling unit, for the moisture measurement value of the moisture measurement value of described material outlet of sampling, material inlet, the measured temperature of described drying cylinder side surface, the leaving air temp measured value of described air-heater and air-out velocity measurement;
The moisture content of outlet control unit be connected with described sampling unit, for revising the leaving air temp setting value of described air-heater, the air-out speed setting value of air-heater and drying cylinder side surface desired temperature according to the change of the moisture measurement value of sampled material outlet, the moisture measurement value of material inlet;
The steam valve control unit be connected with described sampling unit and moisture content of outlet control unit, for controlling the folding size of described steam valve according to described drying cylinder side surface desired temperature and the difference of the measured temperature of sampling, to adjust the steam pressure in drying cylinder;
The air-heater control unit be connected with described sampling unit and moisture content of outlet control unit, changes leaving air temp for controlling described air-heater according to described leaving air temp setting value with the difference of leaving air temp measured value of sampling, and control described air-heater according to air-out speed setting value and the difference of air-out velocity measurement of sampling and change air-out speed.
2. the control system of material drier device according to claim 1, is characterized in that, described sampling unit comprises: at least one the first temperature sampling module of described drying cylinder side surface measured temperature of sampling, comprising:
Be attached at the temperature sensor of the side surface between described drying cylinder bottom surface and the drying materials district of drying cylinder side surface;
Be arranged on described temperature sensor rear end and described temperature sensor be pressed in the spring assembly of described drying cylinder side surface;
For the rotating speed sampling module of the rotating speed measured value of described air-heater of sampling;
For the second temperature sampling module of the leaving air temp measured value of described air-heater of sampling;
For the Moisture Meter of the moisture measurement value of sample described material outlet and material inlet.
3. the control system of material drier device according to claim 2, is characterized in that, described temperature sensor is wired contact type temperature sensor.
4. the control system of material drier device according to claim 1, is characterized in that, described moisture content of outlet control unit comprises:
The feed-forward compensation module be connected with described sampling unit, the real-time compensation budget moisture measurement value of sampled material inlet being carried out to the control hysteresis of material in drying course is carried out for utilizing PI control algolithm, and export budget result, the formula that PI control algorithm adopts is:
The moisture content of outlet control module be connected with described sampling unit and feed-forward compensation module, for utilizing default PID control algorithms to the control component of the moisture content of outlet corresponding to the difference determining material outlet moisture setting value and the moisture measurement value of material outlet of sampling, and revise the leaving air temp setting value of air-heater, the air-out speed setting value of air-heater and drying cylinder side surface desired temperature according to described control component and budget result.
5. the control system of material drier device according to claim 4, it is characterized in that, described moisture content of outlet control module also obtains considering the controlled quentity controlled variable compensating budget for the weight shared separately according to described control component and budget result, and by described controlled quentity controlled variable respectively with the leaving air temp setting value of air-heater preset, the air-out speed setting value of air-heater, and the amplification coefficient of drying cylinder side surface desired temperature carries out amplification computing, obtain the leaving air temp setting value of revised air-heater, the air-out speed setting value of air-heater, and drying cylinder side surface desired temperature.
6. the control system of material drier device according to claim 2, is characterized in that, described steam valve control unit comprises:
The first temperature transmitter be connected with temperature sensor described in each, the measured temperature for sampling according to each described temperature sensor determines the measured temperature in the drying materials district of described drying cylinder side surface;
The steam valve control module be connected with described first temperature transmitter, multiple measured temperatures for obtaining according to multiple repairing weld carry out pid control computation, to obtain the controlled quentity controlled variable of described steam valve, and the opening degree of described steam valve is controlled according to the controlled quentity controlled variable of described steam valve, the formula that pid control computation adopts is:
7. the control system of material drier device according to claim 2, is characterized in that, described air-heater control unit comprises:
The wind speed transducer be connected with described rotating speed sampling module, to convert the air-out velocity measurement of described air-heater to by the rotating speed measured value of sampled air-heater according to the rotating speed of air-heater preset and the corresponding relation of air-out speed;
The the first air-heater control module be connected with described wind speed transducer, multiple described air-out velocity measurement for obtaining according to multiple repairing weld carries out pid control computation, to obtain the controlled quentity controlled variable of the air supply motor in described air-heater, and the power output of described air supply motor is controlled according to the controlled quentity controlled variable of described air supply motor, the formula that pid control computation adopts is:
8. the control system of material drier device according to claim 2, is characterized in that, described air-heater control unit comprises:
With the second temperature transmitter of described second temperature sampling model calling, for the leaving air temp measured value of sampled air-heater is carried out digitlization and amplification;
The the second air-heater control module be connected with described second temperature transmitter, multiple leaving air temp measured values for obtaining according to multiple repairing weld carry out pid control computation, to obtain the controlled quentity controlled variable of the heater in described air-heater, and the power output of described heater is controlled according to the controlled quentity controlled variable of described heater, the formula that pid control computation adopts is:
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| CN105068583B (en) * | 2015-07-07 | 2017-06-23 | 福建中烟工业有限责任公司 | Material water ratio control method and system |
| CN106562464A (en) * | 2016-04-04 | 2017-04-19 | 邓君 | Remote control type tobacco re-baking oven |
| CN106482502B (en) * | 2016-10-10 | 2019-01-15 | 重庆科技学院 | The intelligence drying long-range control method and system recommended based on cloud platform big data |
| CN107957185B (en) * | 2016-10-18 | 2023-07-21 | 中山凯旋真空科技股份有限公司 | Heating control system and method of drying equipment and drying equipment |
| CN108926027B (en) * | 2018-08-07 | 2021-07-23 | 福建中烟工业有限责任公司 | Method and device for drying tobacco shreds by using drum dryer |
| CN109549241B (en) * | 2018-12-29 | 2021-04-20 | 浙江中烟工业有限责任公司 | Steam heating control model and steam heating control method applied to tobacco shred manufacturing drum type cigarette making machine |
| CN112361803A (en) * | 2020-11-22 | 2021-02-12 | 泰州市金元成纺织有限公司 | Electric control system of heat pump drying device |
| CN116734592B (en) * | 2023-08-10 | 2023-10-27 | 浙江中智达科技有限公司 | Control method, device, equipment and storage medium for moisture of dry PVC |
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