CN104111672A - Reduction distillation furnace inner jacket temperature control method and device - Google Patents
Reduction distillation furnace inner jacket temperature control method and device Download PDFInfo
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- CN104111672A CN104111672A CN201310135451.1A CN201310135451A CN104111672A CN 104111672 A CN104111672 A CN 104111672A CN 201310135451 A CN201310135451 A CN 201310135451A CN 104111672 A CN104111672 A CN 104111672A
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Abstract
The invention discloses a reduction distillation furnace inner jacket temperature control method and device. According to the method, the centralized monitoring and decentralized control mode is adopted. The centralized monitoring is that field data collected by all PLCs and state data of the PLCs are centralized to a master control computer through a bus network to realize dynamic monitoring in the global scope of a control system through the master control computer. The decentralized control is that when the reduction distillation furnace inner jacket temperature is in the large deviation state, the stepping Bang-Bang control mode is adopted, when the reduction distillation furnace inner jacket temperature is in the intermediate deviation state, the fuzzy control mode is adopted, and when the reduction distillation furnace inner jacket temperature is in the small deviation state, the PID control mode is adopted. According to the invention, a control strategy is provided for a large-lag, large-inertia, time-varying and nolinear temperature control system to ensure the accuracy of temperature control.
Description
Technical field
the present invention relates to jacket temperature control method and device in a kind of reduction and distillation furnace, belong to large Inertia Temperature control technology field.
Background technology
existing titanium sponge industry reduction distillation furnace temperature is regulated the conduction angle of power regulating eqiupment thyristor conventionally by the analog output of PLC/DCS, with resistive heater heating power in regulating stove, thereby make temperature parameter meet technological requirement.In titanium sponge production run, quite high to the control accuracy requirement of jacket temperature in stove, the control accuracy of temperature directly has influence on the purity of product.Due to jacket temperature system in stove have large time delay, large inertia, time become, the feature such as non-linear, reaction mechanism is complicated, not yet there is accurate mathematical model, the design of its control system is to control focus on boundary and difficult point always.At present, be mostly to adopt in host computer manual shift, saving energy and reduce the cost or aspect precision, all can not get desirable effect no matter be.
Summary of the invention
the object of the invention is to, jacket temperature control method and device in a kind of reduction and distillation furnace are provided, for large time delay, large inertia, time become, nonlinear temperature control system provides a kind of control strategy, to ensure temperature controlled precision, thereby overcomes the deficiencies in the prior art.
technical scheme of the present invention:
in a kind of reduction and distillation furnace of the present invention, jacket temperature control method is, the method is to adopt monitoring, the mode of decentralised control concentrated; Described concentrated monitoring is that the field data of all PLC collections and the status data of PLC itself are focused on to total control computer by bus network, by the dynamic monitoring of master control computer realization control system global scope; Described decentralised control is when jacket temperature in reduction and distillation furnace is during in large deviation state, adopt position formula Bang-Bang control mode, when jacket temperature in reduction and distillation furnace is during in middle deviation state, adopt fuzzy control method, when jacket temperature in reduction and distillation furnace is during in little deviation state, adopt pid control mode.
in preceding method, the steady temperature T of jacket temperature T and technological requirement in described reduction and distillation furnace
2
the absolute value of difference | e| is more than or equal to threshold values ε
1
time be large deviation state; The steady temperature T of jacket temperature T and technological requirement in reduction and distillation furnace
2
the absolute value of difference | e| is greater than threshold values ε
2
and be less than threshold values ε
1
shi Weizhong deviation state; The steady temperature T of jacket temperature T and technological requirement in reduction and distillation furnace
2
the absolute value of difference | e| is less than or equal to threshold values ε
2
shi Wei little deviation state.
in preceding method, described fuzzy control method adopts two-dimensional fuzzy controller, and two-dimensional fuzzy controller has two input variables, an output variable; In reduction and distillation furnace chuck, in the difference e of temperature and stove, rate of temperature change Ec is as input variable, and two-dimensional fuzzy controller output variable is heating power U.
in preceding method, the control mode of described large deviation state, middle deviation state and little deviation state is changed according to the operation result of the configuration software of installing in computing machine automatically by total control computer.
device for jacket temperature control in of the present invention a kind of reduction and distillation furnace of said method is that this device comprises Bang-Bang controller, fuzzy controller and PID controller; The output terminal of Bang-Bang controller, fuzzy controller and PID controller is connected with the heating arrangement in chuck through thyristor, the input end of Bang-Bang controller, fuzzy controller and PID controller is connected with switching device shifter, and switching device shifter is connected with total control computer.
in aforementioned means, in described total control computer, configuration software is installed.
in aforementioned means, in described reduction and distillation furnace chuck, be provided with PLC pick-up unit, PLC pick-up unit is connected with total control computer through signal pickup assembly.
compared with prior art, the present invention divides three sections to control temperature in reduction and distillation furnace chuck, adopts position formula Bang-Bang control mode in the time that temperature is in large deviation in reduction and distillation furnace chuck, is conducive to accelerate governing speed, faster system response; In the time that temperature is in middle deviation in reduction and distillation furnace chuck, adopt fuzzy control method, be conducive to inhibition system and produce overshoot; In the time that temperature is in little deviation in reduction and distillation furnace chuck, adopt pid control mode, be conducive to eliminate system static difference and suppress and disturb, ensure control accuracy.The present invention for large time delay, large inertia, time become, nonlinear temperature control system provides a kind of control strategy, to meet the temperature control of titanium sponge industry reduction and distillation furnace.
Brief description of the drawings
fig. 1 is control flow schematic diagram of the present invention;
fig. 2 is the structural representation of equipment therefor of the present invention;
fig. 3 is the structural representation of fuzzy controller;
fig. 4 is the technological requirement schematic diagram of reduction distillation process to temperature.
being labeled as in accompanying drawing: 1-Bang-Bang controller, 2-fuzzy controller, 3-PID controller, 4-thyristor, the heating arrangement in 5-reduction and distillation furnace chuck, 6-switching device shifter, the total control computer of 7-, 8-signal pickup assembly.
Embodiment
below in conjunction with accompanying drawing, the present invention is described in further detail, but not as any limitation of the invention.
embodiments of the invention: in a kind of reduction and distillation furnace of the present invention, jacket temperature control method is, the method is to adopt monitoring, the mode of decentralised control concentrated; Described concentrated monitoring is that the field data of all PLC collections and the status data of PLC itself are focused on to total control computer by bus network, by the dynamic monitoring of master control computer realization control system global scope; Described decentralised control is when jacket temperature in reduction and distillation furnace is during in large deviation state, adopt position formula Bang-Bang control mode, when jacket temperature in reduction and distillation furnace is during in middle deviation state, adopt fuzzy control method, when jacket temperature in reduction and distillation furnace is during in little deviation state, adopt pid control mode.The steady temperature T of jacket temperature T and technological requirement in described reduction and distillation furnace
2
the absolute value of difference | e| is more than or equal to threshold values ε
1
time be large deviation state; The steady temperature T of jacket temperature T and technological requirement in reduction and distillation furnace
2
the absolute value of difference | e| is greater than threshold values ε
2
and be less than threshold values ε
1
shi Weizhong deviation state; The steady temperature T of jacket temperature T and technological requirement in reduction and distillation furnace
2
the absolute value of difference | e| is less than or equal to threshold values ε
2
shi Wei little deviation state.Described fuzzy control method adopts two-dimensional fuzzy controller, and two-dimensional fuzzy controller has two input variables, an output variable; In reduction and distillation furnace chuck, in the difference e of temperature and stove, rate of temperature change Ec is as input variable, and two-dimensional fuzzy controller output variable is heating power U.The control mode of described large deviation state, middle deviation state and little deviation state is changed according to the operation result of the configuration software of installing in computing machine automatically by total control computer.
device for jacket temperature control in of the present invention a kind of reduction and distillation furnace of said method is that this device comprises Bang-Bang controller 1 of the prior art, fuzzy controller 2 and PID controller 3; When making, the output terminal of Bang-Bang controller 1, fuzzy controller 2 and PID controller 3 is connected with the heating arrangement 5 in chuck through thyristor 4, the input end of Bang-Bang controller 1, fuzzy controller 2 and PID controller 3 is connected with switching device shifter 6, switching device shifter 6 is connected with total control computer 7, and total control computer 7 can adopt common computer of the prior art, Industry Control computer or single-chip microcomputer; When making, by traditional mode, can directly configuration software of the prior art be arranged in total control computer 7, use as control program.In order to reach better control effect, an existing PLC pick-up unit is installed in reduction and distillation furnace chuck, and PLC pick-up unit is connected with total control computer 7 through signal pickup assembly 8.
the present invention is further illustrated below:
fig. 4 is the technological requirement schematic diagram of reduction distillation process to temperature, and in figure, horizontal ordinate is time coordinate, and ordinate is temperature coordinate.As seen from Figure 1, in reduction distillation process, in reduction and distillation furnace chuck, temperature T variation comprises preheating section, section, constant temperature zone and cooling section heat up.Wherein intensification section and constant temperature zone have the greatest impact to product, and the present invention accurately controls heat up section and constant temperature zone.
fig. 2 is the present invention's device used, and as seen from the figure, this device mainly comprises Bang-Bang controller 1, fuzzy controller 2 and PID controller 3;
when jacket temperature in reduction and distillation furnace in large deviation state (| e|>=ε
1
) time, adopt position formula Bang-Bang control mode, when jacket temperature in reduction and distillation furnace is in middle deviation state (ε
2
< | e| < ε
1
) time, adopt fuzzy control method, when jacket temperature in reduction and distillation furnace in little deviation state (| e|≤ε
2
) time, adopt pid control mode.The switching of three kinds of control modes is switched by switching device shifter 6, and switching device shifter 6 is connected with total control computer 7.In total control computer 7, configuration software is installed.The input end of Bang-Bang controller 1, fuzzy controller 2 and PID controller 3 is connected with switching device shifter 6, and the output terminal of fuzzy controller 2 and PID controller 3 is connected with the heating arrangement 5 in reduction and distillation furnace chuck through thyristor 4.In reduction and distillation furnace chuck, be provided with PLC pick-up unit, PLC pick-up unit is connected with total control computer 7 through signal pickup assembly 8.The field data that all PLC are collected and the status data of PLC itself.
so-called fuzzy control as shown in Figure 3, is to adopt to control the temperature in reduction and distillation furnace chuck by the control law of fuzzy mathematics language description.Control device according to fuzzy control rule composition is called fuzzy controller.Fuzzy controller of the present invention has two input variables, an output variable; In reduction and distillation furnace chuck, in the difference e of temperature and stove, rate of temperature change Ec is as input variable, and two-dimensional fuzzy controller output variable is heating power U.
so-called Bang-Bang controls, be actually a kind of time optimal control, its control function is always taken on the border of allowing control, or get maximum, or get minimum, only on these two boundary values, switch, its effect is equivalent to a relay, so be also the formula switch control of a kind of position.Two borders of the present invention are two temperature threshold values ε 1, threshold values ε
2
, this control mode has than conventional PID and controls comparatively superior performance at large deviation state, especially falls and perturbation action significantly more remarkable effect for putting forward of set-point.On dynamic mass, be not only presented as short this feature transit time, and in other indexs such as overshoot also tool have some improvement.
it is a kind of proportional-integral-differential control that PID controls, that the data of collecting and the constant temperature value of technological requirement are compared, then this difference for calculating new input value, the object of this new input value is can allow the data of system reach or remain on constant temperature value.Can make system more accurate, more stable.
workflow of the present invention as shown in Figure 1.After start, total control computer 7 starts, and first gathers difference e and the interior rate of temperature change Ec of stove between the interior jacket temperature T of reduction and distillation furnace and the steady temperature T2 of technological requirement; Then with two temperature threshold values ε
1
with threshold values ε
2
compare, and judge real time temperature status, then determine and adopt any control mode according to real time temperature status.Again detected once at interval of 5 seconds, redefine control mode.
supplementary notes of the present invention
intensification section in the temperature changing process of reduction and distillation furnace and cooling section be a large time delay, large inertia, time become, non-linear, reaction mechanism complex process, without accurate mathematical model, adopt Bang-Bang to control and fuzzy control, other stages adopt conventional PID to control.This control program in actual applications, has obtained good temperature control effect.
the parameter that system need to be monitored has: stove jacket temperature, temperature in stove, heating power (thyristor conduction angle size), furnace pressure, the parameters such as various switching signals.In order to detect and control these operational factors, by analog input signal wire access PLC output port, control heating power etc. by the standard current signal of 4～20mA.
by analysis and conclusion to industrial field device steering logic relation, in the overall design of system, adopt and concentrate monitoring, the principle of decentralised control, realizes measurement/status data real time monitoring; And the field data that all PLC are collected and the status data of PLC itself focus on total control computer by bus network, realize moving monitoring and the field data analysis of the global scope of control system with the configuration software of total control computer and process and file.
the control program of jacket temperature in stove.In the time of large deviation, adopt position formula Bang-Bang to control and be conducive to accelerate governing speed, faster system response; Then be that state adopts fuzzy control while being middle deviation, fast response time, is conducive to inhibition system and produces overshoot; Last little deviation state, utilizes PID to regulate and is conducive to eliminate system static difference and suppresses interference.In whole control strategy, the setting of two threshold values is very important, if Bang-Bang controls and fuzzy control between the threshold values that switches excessive, system response time is slow, too small system overshoot is excessive, reaches the stable state time used long.Between fuzzy control and PID control, the threshold values of conversion is too small there will be small size vibration, causes steady-state error to strengthen.Two threshold values are to determine by experiment repeatedly.
the present invention adopts two-dimensional fuzzy controller, in chuck in the difference e of temperature and stove rate of temperature change Ec as input variable, using heating power U as output variable, (note: Ec in fuzzy controller, U obtains according to corresponding fuzzy rule by software collection data e).
utilize the mixing control program of native system, adopt fuzzy rule as main regulation, PID is as the control strategy of fine adjustment, to the pre-judgement in advance of the variation tendency of system, the topmost feature of the present invention be for large time delay, large inertia, time become, nonlinear temperature control system provides a kind of control strategy, ensures the precision of controlling.
Claims (7)
1. a jacket temperature control method in reduction and distillation furnace, is characterized in that: the method is to adopt monitoring, the mode of decentralised control concentrated; Described concentrated monitoring is that the field data of all PLC collections and the status data of PLC itself are focused on to total control computer by bus network, by the dynamic monitoring of master control computer realization control system global scope; Described decentralised control is when jacket temperature in reduction and distillation furnace is during in large deviation state, adopt position formula Bang-Bang control mode, when jacket temperature in reduction and distillation furnace is during in middle deviation state, adopt fuzzy control method, when jacket temperature in reduction and distillation furnace is during in little deviation state, adopt pid control mode.
2. method according to claim 1, is characterized in that: the absolute value of the difference of the steady temperature T2 of jacket temperature T and technological requirement in described reduction and distillation furnace | e| is more than or equal to threshold values ε
1time be large deviation state; The steady temperature T of jacket temperature T and technological requirement in reduction and distillation furnace
2the absolute value of difference | e| is greater than threshold values ε
2and be less than threshold values ε
1shi Weizhong deviation state; The steady temperature T of jacket temperature T and technological requirement in reduction and distillation furnace
2the absolute value of difference | e| is less than or equal to threshold values ε
2shi Wei little deviation state.
3. method according to claim 1, is characterized in that: described fuzzy control method adopts two-dimensional fuzzy controller, and two-dimensional fuzzy controller has two input variables, an output variable; In reduction and distillation furnace chuck, in the difference e of temperature and stove, rate of temperature change Ec is as input variable, and two-dimensional fuzzy controller output variable is heating power U.
4. method according to claim 1, is characterized in that: the control mode of described large deviation state, middle deviation state and little deviation state is changed according to the operation result of the configuration software of installing in computing machine automatically by total control computer.
5. a device for jacket temperature control in reduction and distillation furnace, is characterized in that: comprise Bang-Bang controller (1), fuzzy controller (2) and PID controller (3); The output terminal of Bang-Bang controller (1), fuzzy controller (2) and PID controller (3) is connected with the heating arrangement (5) in reduction and distillation furnace chuck through thyristor (4), the input end of Bang-Bang controller (1), fuzzy controller (2) and PID controller (3) is connected with switching device shifter (6), and switching device shifter (6) is connected with total control computer (7).
6. install according to claim 5, it is characterized in that: in described total control computer (7), configuration software is installed.
7. install according to claim 5, it is characterized in that: in described reduction and distillation furnace chuck, be provided with PLC pick-up unit, PLC pick-up unit is connected with total control computer (7) through signal pickup assembly (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310135451.1A CN104111672A (en) | 2013-04-18 | 2013-04-18 | Reduction distillation furnace inner jacket temperature control method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310135451.1A CN104111672A (en) | 2013-04-18 | 2013-04-18 | Reduction distillation furnace inner jacket temperature control method and device |
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| CN104111672A true CN104111672A (en) | 2014-10-22 |
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Application publication date: 20141022 |