CN103090410A - Combustion air pressure control method, device and system for heating furnace - Google Patents
Combustion air pressure control method, device and system for heating furnace Download PDFInfo
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Abstract
The invention provides a combustion air pressure control method, a control device and a control system which are used for a heating furnace. The combustion air pressure control method includes the steps of calculating the difference value between a technological pressure set value and a real-time pressure feedback value, increasing the technological pressure set value progressively when the technological pressure set value is less than the real-time pressure feedback value and the difference value is not within a preset range, inputting each progressively increased pressure value to a proportion integration differentiation (PID) controller, enabling the PID controller to adjust the opening degree of a valve according to a difference value between the progressively increased pressure value and the real-time pressure feedback value until the progressively increased pressure value is larger than or equal to the real-time pressure feedback value, decreasing the technological pressure set value progressively when the technological pressure set value is larger than the real-time pressure feedback value and the difference value is not within a preset range, inputting each progressively decreased pressure value to a proportion integration differentiation (PID) controller, and enabling the PID controller to adjust the opening degree of a valve according to a difference value between the progressively decreased pressure value and the real-time pressure feedback value until the progressively decreased pressure value is less than or equal to the real-time pressure feedback value. The combustion air pressure control method, the control device and the control system which are used for the heating furnace can enable the PID controller to achieve real-time stable adjustment.
Description
Technical field
The present invention relates to automatic control control technology field, relate in particular to a kind of heating furnace combustion air compress control method, Apparatus and system.
Background technology
The combustion air Pressure Control Technology is one of control technology of core in the heating furnace automatic control system.Be directly connected to the energy consumption of heating quality and the ton steel of steel billet due to wind system, in actual applications, form negative pressure in stove by furnace air density less than the density of flue gas.But the unit interval wind supply quantity is suddenly excessive or too small, and furnace pressure is changed.If wind supply quantity is excessive suddenly, will cause producing malleation in stove, and malleation spills high-temperature flue gas, strengthen heat loss and caused the outer steel construction of stove overheated or burn out and cause accident; If wind supply quantity is too small suddenly, will makes fuel combustion insufficient, and cause that easily negative pressure is excessive; the heat that flue gas is taken away is just more; cause waste, therefore, effective control of heating combustion air pressure has been played important function for aspects such as energy-saving and cost-reducing and protections.
At present, control for combustion fan pressure, comparatively advanced control program is that adoption rate-integration-differential PID controller is controlled realization, soon the real-time pressure of combustion air feedback and operation pressure setting value are as the input of PID controller, the PID controller is regulated the opening degree of combustion fan entrance air-valve according to the difference of real-time pressure value of feedback and operation pressure setting value, thereby realizes the adjusting of combustion air pressure.
Yet in actual applications, rhythm of production, cold blank dress steel, hot blank dress steel, cold and hot blank such as load in mixture at the factor, determined heating furnace actual be changeable with air quantity, this pressure feedback that has just caused combustion air is also changeable.The inventor finds in realizing process of the present invention: existing control program can produce over control, be that instantaneous phenomenon near completely open and close appears in inlet valve, this phenomenon can make furnace pressure malleation occur, the excessive situation of negative pressure perhaps occurs, causes waste and the potential safety hazard of the energy.
Summary of the invention
The invention provides a kind of heating furnace combustion air compress control method, Apparatus and system, can make furnace pressure malleation occur in order to solve existing control program owing to producing over control, the excessive excessive situation of situation negative pressure of negative pressure perhaps appears, and then cause the waste of the energy and the problem of potential safety hazard, its technical scheme is as follows:
A kind of heating furnace combustion air compress control method comprises:
Calculate the difference of operation pressure setting value and real-time pressure value of feedback;
When described operation pressure sets value less than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make described PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback;
When described operation pressure sets value greater than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make described PID controller according to the opening degree of the difference control valve of the force value after successively decreasing and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback.
Preferably, described operation pressure setting value is increased progressively according to default incremental number comprise: described operation pressure setting value is increased progressively according to default incremental number and the default rule that increases progressively, the described rule that increases progressively is: the operation pressure setting value adds that N multiply by default incremental number, wherein, it is the increment value of the N time that described N multiply by default incremental number, and N is the positive integer more than or equal to 1.
Preferably, described operation pressure setting value is successively decreased according to the default number that successively decreases comprise: described operation pressure setting value is successively decreased according to default number and the default rule of successively decreasing of successively decreasing, the described rule of successively decreasing is: the operation pressure setting value deducts M and multiply by the default number that successively decreases, wherein, it is the decrement value of the M time that described M multiply by default incremental number, and M is the positive integer more than or equal to 1.
Alternatively, the valve openings degree with combustion fan is divided into a plurality of intervals in advance, and sets with each interval corresponding valve openings degree and determine rule, and described method also comprises:
When the number of the combustion fan that uses is two, determine the affiliated interval of output valve of PID controller, according to determining rule with the interval corresponding valve openings degree of determining, determine the opening degree of two valves corresponding with two combustion fans, the opening degree of the valve that foundation is determined is regulated corresponding valve.
Preferably, describedly in advance the valve openings degree of combustion fan is divided into a plurality of intervals, and set with each interval corresponding valve openings degree and determine that rule comprises: valve openings degree 0%-100% is divided into a plurality of intervals, in each interval, fix a valve openings degree, adjust another valve openings degree.
A kind of heating furnace combustion air pressure control device comprises: computing unit, the first adjustment unit and the second adjustment unit;
Described computing unit is for calculating the difference of operation pressure setting value with the real-time pressure value of feedback;
Described the first adjustment unit, be used for when described operation pressure setting value less than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make described PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback;
Described the second adjustment unit, be used for when described operation pressure setting value greater than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make described PID controller according to the opening degree of the difference control valve of the force value after successively decreasing and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback.
Preferably, described the first adjustment unit comprises: increase progressively subelement;
The described subelement that increases progressively, be used for described operation pressure setting value is increased progressively according to default incremental number and the default rule that increases progressively, the described rule that increases progressively is: the operation pressure setting value adds that N multiply by default incremental number, wherein, it is the increment value of the N time that described N multiply by default incremental number, and N is the positive integer more than or equal to 1.
Preferably, described the second adjustment unit comprises: subelement successively decreases;
The described subelement that successively decreases, for described operation pressure setting value is successively decreased according to the default rule of successively decreasing of successively decreasing number and presetting, the described rule of successively decreasing is: the operation pressure setting value deducts M and multiply by the default number that successively decreases, wherein, it is the decrement value of the M time that described M multiply by default incremental number, and M is the positive integer more than or equal to 1.
Preferably, the valve openings degree with combustion fan is divided into a plurality of intervals in advance, and sets definite regularly with each interval corresponding valve openings degree, also comprises: the first determining unit, the second determining unit and valve regulated unit;
Described the first determining unit when being two for the number of working as the combustion fan that uses, is determined the affiliated interval of output valve of PID controller;
Described the second determining unit is used for determining and two valve openings degree that blower fan is corresponding according to determining rule with the interval corresponding valve openings degree that described the first determining unit is determined;
Described valve regulated unit is used for according to the valve openings degree that described the second determining unit is determined, corresponding valve being regulated.
A kind of heating furnace combustion air control pressurer system comprises: pressure transmitter, programmable logic controller (PLC) PLC and PID controller, wherein:
Described pressure transmitter is connected with described PLC, is used for obtaining the real-time pressure value of feedback and the real-time pressure value of feedback of obtaining is inputted described PLC;
described PLC is connected with described PID controller, be used for calculating the difference of operation pressure setting value and described real-time pressure value of feedback, when described operation pressure sets value less than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make described PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback, when described operation pressure sets value greater than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make described PID controller according to the opening degree of the difference control valve of the force value after successively decreasing and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback,
Described PID controller is used for regulating with the pressure to combustion air according to the increasing or decreasing force value of PLC output and the opening degree of the valve of the difference adjusting combustion fan of real-time pressure value of feedback.
heating furnace combustion air compress control method provided by the invention, Apparatus and system, when the force value variation of input PID controller is excessive, by the technique initialization force value is carried out increasing or decreasing, the difference control valve opening degree of the force value after making the PID controller according to increasing or decreasing and real-time pressure value of feedback, thereby make the real-time pressure value of feedback close to the operation pressure setting value gradually, reduce the deviation of operation pressure and real-time pressure value of feedback, this makes the PID controller can be real-time, stable adjusting, overcome the impact that the existing over control of existing PID control program is brought furnace pressure and fuel combustion.In addition, the method that provides of the embodiment of the present invention has solved the PID controller simultaneously to the unmanageable problem of the air-valve of two combustion fans.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
The schematic flow sheet of the heating furnace combustion air compress control method that Fig. 1 provides for the embodiment of the present invention;
The schematic flow sheet of the heating furnace combustion air compress control method that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the heating furnace combustion air pressure control device that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the heating furnace combustion air pressure control device that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the heating furnace combustion air control pressurer system that Fig. 5 provides for the embodiment of the present invention.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the present invention provides a kind of heating furnace combustion air compress control method, and the method is applied to the input of PID controller, and Fig. 1 is the schematic flow sheet of the method, and the method can comprise:
S101: the difference of calculating operation pressure setting value and real-time pressure value of feedback.
S102: judge that difference whether in preset range, if so, changes step S107 over to, if not, change step S103 over to.
S103: judge that the operation pressure setting value whether less than the real-time pressure value of feedback, if so, changes step S104 over to, if not, change step S105 over to.
Need to prove, when difference is not in preset range, whether also can first judge the operation pressure setting value greater than the real-time pressure value of feedback, if not, then judge that whether the operation pressure setting value is less than the real-time pressure value of feedback.
S104: the operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make the PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback.
S105: judge that the operation pressure setting value whether greater than the real-time pressure value of feedback, if so, changes step S106 over to, if not, carry out other operation.
S106: the operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make the PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback.
S107: according to the difference control valve opening degree of operation pressure setting value with the real-time pressure value of feedback.
For example, preset range is-600 ~+600, if operation pressure setting value is 8000, the real-time pressure value of feedback is 7000, and so, difference is 1000, not in preset range, again due to the operation pressure setting value greater than the real-time pressure value of feedback, execution in step S106.
In the present embodiment, when the difference of operation pressure setting value and real-time pressure value of feedback is not in preset range, operation pressure is set value according to the preset rules increasing or decreasing, regulated the valve openings degree of combustion fan according to the difference of the force value of successively decreasing after increasing progressively and real-time pressure value of feedback by the PID controller, so that the force value that feeds back constantly reduces or increases, thus close to the operation pressure setting value.
In other embodiments of the invention, force value after increasing progressively is more than or equal to the real-time pressure value of feedback, when the force value after perhaps successively decreasing is less than or equal to the real-time pressure value of feedback, judge that again the difference of operation pressure setting value and the real-time pressure value of feedback of this moment is whether in preset range, if not, change step S103 over to, until the difference of operation pressure setting value and real-time pressure value of feedback is in preset range.
In another embodiment of the present invention, in step S104, the operation pressure setting value is increased progressively and can comprise according to the first preset rules: the operation pressure setting value is increased progressively according to default incremental number and the default rule that increases progressively, increase progressively rule and can add that N multiply by default incremental number for: operation pressure setting value, wherein, it is the increment value of the N time that N multiply by default incremental number, and N is the positive integer more than or equal to 1.In the present embodiment, the increasing velocity of force value is decided by the actual act situation of valve, increases progressively once as be decided to be every 1 second by actual analysis.
for example, preset range is-600 ~+600, and the operation pressure setting value is 8000, and this moment, the real-time pressure value of feedback is 9000, and difference both is-1000, less than-600, default increment value is 40, in the first second, operation pressure setting value 8000 is added that 1*40 obtains 8040, with 8040 input PID controllers, the difference-960 of PID controller foundation 8040 and 9000 is the control valve opening degree significantly, makes setting value near operation pressure of real-time pressure value of feedback maximal rate, in the second second, operation pressure setting value 8000 is added that 2*40 obtains 8080, with 8080 input PID controllers, the difference control valve opening degree of PID controller foundation 8080 and real-time pressure value of feedback, the governing speed of PID slows down, by that analogy, in the process of regulating, due to the force value that constantly increases always less than the real-time pressure value of feedback, therefore valve do not disconnect little, along with not disconnecting of valve is little, the pressure that feeds back is that the real-time pressure value of feedback is also constantly reducing, when N second, the force value that increases progressively is during more than or equal to the real-time pressure value of feedback, go again to judge that the difference of operation pressure setting value and this real-time pressure value of feedback is whether in preset range-600 ~ 600, if not, repeat said process.
In an embodiment more of the present invention, in step S105, operation pressure setting value foundation the second preset rules is successively decreased and can be comprised: the operation pressure setting value is successively decreased according to the default rule of successively decreasing of successively decreasing number and presetting, the rule of successively decreasing can multiply by the default number that successively decreases for: operation pressure setting value deducts M, wherein, it is the decrement value of the M time that described M multiply by default incremental number, and M is the positive integer more than or equal to 1.
for example, the operation pressure setting value is 8000, and this moment, the real-time pressure value of feedback is 7000, difference both is 1000, greater than+600, default decrement value is 40, in the first second, operation pressure setting value 8000 is deducted 1*40 obtain 7960, with 7960 input PID controllers, the difference 960 of PID controller foundation 7960 and 7000 is the control valve opening degree significantly, makes setting value near operation pressure of real-time pressure value of feedback maximal rate, in the second second, operation pressure setting value 8000 is deducted 2*40 obtain 7920, with 7920 input PID controllers, like this, operation pressure setting value after successively decreasing can diminish again with the difference of real-time pressure value of feedback, the governing speed of PID controller slows down, by that analogy, in the process of regulating, due to ever-reduced force value always greater than the real-time pressure value of feedback, therefore valve does not disconnect greatly, along with not disconnecting of valve is large, the pressure that feeds back is that the real-time pressure value of feedback is also in continuous increase, when M second, when the force value of successively decreasing is less than or equal to the real-time pressure value of feedback, go again to judge that the difference of operation pressure setting value and this real-time pressure value of feedback is whether in preset range-600 ~ 600, if not, repeat said process.
in the prior art, when using two combustion fans, need to regulate simultaneously the valve openings degree of two air-valves, this control program makes combustion fan pressure produce very large fluctuation, be difficult to control, in order to address this problem, in an embodiment more of the present invention, said method also comprises the part that is applied to the PID controller output end, valve openings degree with combustion fan is divided into a plurality of intervals in advance, and set with each interval corresponding valve openings degree and determine rule, Fig. 2 has provided the schematic flow sheet of the method for the output that is applied to the PID controller, can comprise:
S201: the number of the combustion fan that statistics is used.
S202: whether the number of the combustion fan that judgement is used is two, and if so, execution in step S202 and subsequent step, if not, regulate according to the output valve pair valve corresponding with dropping into blower fan of PID.
S203: the affiliated interval of output valve of determining the PID controller.
S204: according to determining rule with the interval corresponding valve openings degree of determining, determine and two valve openings degree that blower fan is corresponding.
S205: corresponding valve is regulated according to the valve openings degree of determining.
In another embodiment of the present invention, valve openings degree with combustion fan is divided into a plurality of intervals in advance, and set valve openings degree corresponding with each interval determine rule can for: valve openings degree 0%-100% is divided into a plurality of intervals, in each interval, fix a valve openings degree, only regulate another valve openings degree.
In the present embodiment, valve openings degree 0%-100% can be divided into 40 intervals, be respectively: 0%-2.5%, 2.5%-5%, 5%-7.5%, 7.5%-10%, 10%-12.5%, 12.5%-15% ..., 95%-97.5%, 97.5%-100%.
If blower fan is 2, determine the interval under the output valve of PID controller, and according to and the interval corresponding valve openings degree of determining determine regularly, definite valve openings degree corresponding with two blower fans can comprise:
(1) if the output valve of 0%＜PID controller＜2.5%, the output valve-0% of the opening degree of valve 1=2*PID controller (this interval minimum of a value), the opening degree of valve 2=0% (this interval minimum of a value).
(2) if the output valve of 2.5%＜PID controller＜5%, the opening degree of valve 1=5% (this interval maximum), the output valve-5% of the opening degree of valve 2=2*PID controller (this interval maximum).
(3) if the output valve of 5%＜PID controller＜7.5%, the output valve-5% of the opening degree of valve 1=2*PID controller (this interval minimum of a value), the opening degree of valve 2=5% (this interval minimum of a value).
(4) if the output valve of 7.5%＜PID controller＜10%, the opening degree of valve 1=10% (this interval maximum), the output valve-10% of the opening degree of valve 2=2*PID controller (this interval maximum).
............
(39) if the output valve of 95%＜PID controller＜97.5%, the output valve-95% of the opening degree of valve 1=2*PID controller (this interval minimum of a value), the opening degree of valve 2=95% (this interval minimum of a value).
(40) if the output valve of 97.5%＜PID controller＜100%, the opening degree of valve 1=100% (this interval maximum), the output valve-100% of the opening degree of valve 2=2*PID controller (this interval maximum).
For example, the output valve of PID controller is 23%, it belongs to this interval of 22.5%-25%, so, aperture=the 2*23%-22.5%=23.5 of valve 1, the aperture of valve 2=22.5% is namely in this interval of 22.5%-25%, the aperture of fixed valve 2 is 22.5%, and the opening degree of valve 1 is regulated between 22.5%-25%.
Certainly, the present embodiment does not limit valve openings degree 0%-100% is divided into 40 intervals, and interval quantity can be decided according to practical application.
the heating furnace combustion air compress control method that the embodiment of the present invention provides, when the force value variation of input PID controller is excessive, by the technique initialization force value is carried out increasing or decreasing, the difference control valve opening degree of the force value after making the PID controller according to increasing or decreasing and real-time pressure value of feedback, thereby make the real-time pressure value of feedback close to the operation pressure setting value gradually, reduce the deviation of operation pressure and real-time pressure value of feedback, this makes the PID controller can be real-time, stable adjusting, overcome the impact that the existing over control of existing PID control program is brought furnace pressure and fuel combustion.In addition, the method that provides of the embodiment of the present invention has solved the PID controller simultaneously to the unmanageable problem of the air-valve of two combustion fans.
Corresponding with said method, the embodiment of the present invention also provides a kind of heating furnace combustion air pressure control device, and Fig. 3 is the structural representation of this device, and this device can comprise: computing unit 11, the first adjustment unit 12 and the second adjustment unit 13.Wherein:
The first adjustment unit 12, be used for when the operation pressure setting value less than the real-time pressure value of feedback, and difference is not when preset range, the operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make the PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback.
The second adjustment unit 13, be used for when the operation pressure setting value greater than the real-time pressure value of feedback, and difference is not when preset range, the operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make the PID controller according to the opening degree of the difference control valve of the force value after successively decreasing and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback.
In another embodiment of the present invention, the first adjustment unit can comprise: increase progressively subelement.Increase progressively subelement, for the operation pressure setting value being increased progressively according to default incremental number and the rule that increases progressively of presetting, increasing progressively rule be: the operation pressure setting value adds that N multiply by default incremental number, wherein, it is the increment value of the N time that N multiply by default incremental number, and N is the positive integer more than or equal to 1.
In an embodiment more of the present invention, the second adjustment unit comprises the subelement that successively decreases.Subelement successively decreases, for the operation pressure setting value is successively decreased according to the default rule of successively decreasing of successively decreasing number and presetting, the rule of successively decreasing is: the operation pressure setting value deducts M and multiply by the default number that successively decreases, wherein, it is the decrement value of the M time that M multiply by default incremental number, and M is the positive integer more than or equal to 1.
In another embodiment of the present invention, said apparatus can also comprise: the first determining unit 21, the second determining unit 22 and valve regulated unit 23, as shown in Figure 4.Wherein:
The first determining unit 21 is used for when the number that drops into blower fan is two, determines the affiliated interval of output valve of PID controller.The second determining unit 22 is used for determining and two valve openings degree that blower fan is corresponding according to determining rule with the interval corresponding valve openings degree that the first determining unit 21 is determined.Valve regulated unit 23 is used for according to the valve openings degree that the second determining unit 22 is determined, corresponding valve being regulated.
Wherein, the first determining unit comprises: statistics subelement, judgment sub-unit and first are determined subelement.Wherein: statistics subelement, the number that is used for adding up the combustion fan that uses, judgment sub-unit, be used for judging whether the number of the combustion fan that uses is two, first determines subelement, is used for when the number that drops into blower fan is two, determines the affiliated interval of output valve of PID controller.
the heating furnace combustion air pressure control device that the embodiment of the present invention provides, when the force value variation of input PID controller is excessive, by the technique initialization force value is carried out increasing or decreasing, the difference control valve opening degree of the force value after making the PID controller according to increasing or decreasing and real-time pressure value of feedback, thereby make the real-time pressure value of feedback close to the operation pressure setting value gradually, reduce the deviation of operation pressure and real-time pressure value of feedback, this makes the PID controller can be real-time, stable adjusting, overcome the impact that the existing over control of existing PID control program is brought furnace pressure and fuel combustion.In addition, the method that provides of the embodiment of the present invention has solved the PID controller simultaneously to the unmanageable problem of the air-valve of two combustion fans.
The embodiment of the present invention also provides a kind of heating furnace combustion air control pressurer system, and Fig. 5 is the structural representation of this system, and this system can comprise: pressure transmitter 1, programmable logic controller (PLC) PLC2 and PID controller 3.Wherein:
Pressure transmitter 1 is used for obtaining the real-time pressure value of feedback and the real-time pressure value of feedback is inputted PLC.
PLC2 is connected with pressure transmitter 1, be used for calculating the difference of operation pressure setting value and described real-time pressure value of feedback, when operation pressure sets value less than the real-time pressure value of feedback, and difference is not when preset range, the operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make the PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback; When operation pressure sets value greater than the real-time pressure value of feedback, and difference is not when preset range, the operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make the PID controller according to the opening degree of the difference control valve of the force value after successively decreasing and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback.
PID controller 3 is connected with PLC2, regulates the opening degree of the valve of combustion fan for the difference of the increasing or decreasing force value of exporting according to PLC2 and real-time pressure value of feedback, regulates with the pressure to combustion air.
In another embodiment of the present invention, PLC2 also can judge the number that drops into blower fan, when the number that drops into blower fan is two, determine the affiliated interval of output valve of PID controller 3, according to determining rule with the interval corresponding valve openings degree of determining, determine and two valve openings degree that blower fan is corresponding, and according to the valve openings degree of determining, corresponding valve is regulated.In the present embodiment, needs are divided into a plurality of intervals with the valve openings degree of combustion fan in advance, and set with each interval corresponding valve openings degree and determine rule, particularly, valve openings degree 0%-100% can be divided into a plurality of intervals, in each interval, fix a valve openings degree, only regulate another valve openings degree.
In an embodiment more of the present invention, said system can also comprise industrial computer.Industrial computer is connected with PLC, is used for showing real-time pressure value of feedback and valve openings degree.
the heating furnace combustion air control pressurer system that the embodiment of the present invention provides, when the force value variation of input PID controller is excessive, by the technique initialization force value is carried out increasing or decreasing, the difference control valve opening degree of the force value after making the PID controller according to increasing or decreasing and real-time pressure value of feedback, thereby make the real-time pressure value of feedback close to the operation pressure setting value gradually, reduce the deviation of operation pressure and real-time pressure value of feedback, this makes the PID controller can be real-time, stable adjusting, overcome the impact that the existing over control of existing PID control program is brought furnace pressure and fuel combustion.In addition, the method that provides of the embodiment of the present invention has solved the PID controller simultaneously to the unmanageable problem of the air-valve of two combustion fans.
For the convenience of describing, be divided into various unit with function when describing above device and describe respectively.Certainly, can realize the function of each unit in same or a plurality of softwares and/or hardware when enforcement is of the present invention.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and between each embodiment, identical similar part is mutually referring to getting final product, and each embodiment stresses is difference with other embodiment.Especially, for system embodiment, substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part gets final product referring to the part explanation of embodiment of the method due to it.System embodiment described above is only schematic, wherein said unit as the separating component explanation can or can not be also physically to separate, the parts that show as the unit can be or can not be also physical locations, namely can be positioned at a place, perhaps also can be distributed on a plurality of NEs.Can select according to the actual needs wherein some or all of module to realize the purpose of the present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation that do not pay creative work.
The present invention can describe in the general context of the computer executable instructions of being carried out by computer, for example program module.Usually, program module comprises the routine carrying out particular task or realize particular abstract data type, program, object, assembly, data structure etc.Also can put into practice the present invention in DCE, in these DCEs, be executed the task by the teleprocessing equipment that is connected by communication network.In DCE, program module can be arranged in the local and remote computer-readable storage medium that comprises memory device.
Need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operating space, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or operation.
The above is only the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a heating furnace combustion air compress control method, is characterized in that, comprising:
Calculate the difference of operation pressure setting value and real-time pressure value of feedback;
When described operation pressure sets value less than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make described PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback;
When described operation pressure sets value greater than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make described PID controller according to the opening degree of the difference control valve of the force value after successively decreasing and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback.
2. method according to claim 1, it is characterized in that, described operation pressure setting value is increased progressively according to default incremental number comprise: described operation pressure setting value is increased progressively according to default incremental number and the default rule that increases progressively, the described rule that increases progressively is: the operation pressure setting value adds that N multiply by default incremental number, wherein, it is the increment value of the N time that described N multiply by default incremental number, and N is the positive integer more than or equal to 1.
3. method according to claim 1, it is characterized in that, described operation pressure setting value is successively decreased according to the default number that successively decreases comprise: described operation pressure setting value is successively decreased according to default number and the default rule of successively decreasing of successively decreasing, the described rule of successively decreasing is: the operation pressure setting value deducts M and multiply by the default number that successively decreases, wherein, it is the decrement value of the M time that described M multiply by default incremental number, and M is the positive integer more than or equal to 1.
4. method according to claim 1, is characterized in that, the valve openings degree with combustion fan is divided into a plurality of intervals in advance, and set with each interval corresponding valve openings degree and determine rule, and described method also comprises:
When the number of the combustion fan that uses is two, determine the affiliated interval of output valve of PID controller, according to determining rule with the interval corresponding valve openings degree of determining, determine the opening degree of two valves corresponding with two combustion fans, the opening degree of the valve that foundation is determined is regulated corresponding valve.
5. method according to claim 2, it is characterized in that, describedly in advance the valve openings degree of combustion fan is divided into a plurality of intervals, and set with each interval corresponding valve openings degree and determine that rule comprises: valve openings degree 0%-100% is divided into a plurality of intervals, in each interval, fix a valve openings degree, adjust another valve openings degree.
6. a heating furnace combustion air pressure control device, is characterized in that, comprising: computing unit, the first adjustment unit and the second adjustment unit;
Described computing unit is for calculating the difference of operation pressure setting value with the real-time pressure value of feedback;
Described the first adjustment unit, be used for when described operation pressure setting value less than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make described PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback;
Described the second adjustment unit, be used for when described operation pressure setting value greater than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make described PID controller according to the opening degree of the difference control valve of the force value after successively decreasing and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback.
7. device according to claim 6, is characterized in that, described the first adjustment unit comprises: increase progressively subelement;
The described subelement that increases progressively, be used for described operation pressure setting value is increased progressively according to default incremental number and the default rule that increases progressively, the described rule that increases progressively is: the operation pressure setting value adds that N multiply by default incremental number, wherein, it is the increment value of the N time that described N multiply by default incremental number, and N is the positive integer more than or equal to 1.
8. device according to claim 6, is characterized in that, described the second adjustment unit comprises: subelement successively decreases;
The described subelement that successively decreases, for described operation pressure setting value is successively decreased according to the default rule of successively decreasing of successively decreasing number and presetting, the described rule of successively decreasing is: the operation pressure setting value deducts M and multiply by the default number that successively decreases, wherein, it is the decrement value of the M time that described M multiply by default incremental number, and M is the positive integer more than or equal to 1.
9. device according to claim 6, it is characterized in that, valve openings degree with combustion fan is divided into a plurality of intervals in advance, and sets definite regularly with each interval corresponding valve openings degree, also comprises: the first determining unit, the second determining unit and valve regulated unit;
Described the first determining unit when being two for the number of working as the combustion fan that uses, is determined the affiliated interval of output valve of PID controller;
Described the second determining unit is used for determining and two valve openings degree that blower fan is corresponding according to determining rule with the interval corresponding valve openings degree that described the first determining unit is determined;
Described valve regulated unit is used for according to the valve openings degree that described the second determining unit is determined, corresponding valve being regulated.
10. a heating furnace combustion air control pressurer system, is characterized in that, comprising: pressure transmitter, programmable logic controller (PLC) PLC and PID controller, wherein:
Described pressure transmitter is connected with described PLC, is used for obtaining the real-time pressure value of feedback and the real-time pressure value of feedback of obtaining is inputted described PLC;
described PLC is connected with described PID controller, be used for calculating the difference of operation pressure setting value and described real-time pressure value of feedback, when described operation pressure sets value less than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is increased progressively according to default incremental number, each force value input PID controller after increasing progressively, make described PID controller according to the opening degree of the difference control valve of the force value after increasing progressively and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly reduces, until the force value after increasing progressively is more than or equal to the real-time pressure value of feedback, when described operation pressure sets value greater than described real-time pressure value of feedback, and described difference is not when preset range, described operation pressure setting value is successively decreased according to the default number that successively decreases, each force value input PID controller after successively decreasing, make described PID controller according to the opening degree of the difference control valve of the force value after successively decreasing and real-time pressure value of feedback, so that the real-time pressure value of feedback constantly increases, until the force value after successively decreasing is less than or equal to the real-time pressure value of feedback,
Described PID controller is used for regulating with the pressure to combustion air according to the increasing or decreasing force value of PLC output and the opening degree of the valve of the difference adjusting combustion fan of real-time pressure value of feedback.
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| CN109731880A (en) * | 2019-01-18 | 2019-05-10 | 力同环保机械（上海）有限公司 | Automatic control device and method for aluminium paint line air draft to RTO |
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