CN103090410B - 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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- CN103090410B CN103090410B CN201310039775.5A CN201310039775A CN103090410B CN 103090410 B CN103090410 B CN 103090410B CN 201310039775 A CN201310039775 A CN 201310039775A CN 103090410 B CN103090410 B CN 103090410B
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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, particularly relate to a kind of heating furnace combustion air compress control method, Apparatus and system.
Background technology
Combustion air Pressure Control Technology is one of control technology of core in heating furnace automatic control system.Because wind system is directly connected to the heating quality of steel billet and the energy consumption of ton steel, in actual applications, the density being less than flue gas by furnace air density forms negative pressure in stove.But unit interval wind supply quantity is excessive or too small suddenly, furnace pressure all can be made to change.If wind supply quantity is excessive suddenly, will cause producing malleation in stove, and malleation makes high-temperature flue gas spill, increase heat loss and cause the outer steel construction of stove overheated or burn out and cause accident; If wind supply quantity is too small suddenly, fuel combustion will be made insufficient, and easily cause negative pressure excessive; the heat that flue gas is taken away is more; cause waste, therefore, effective control of heating combustion air pressure serves important function for aspects such as energy-saving and cost-reducing and protections.
At present, for the control of combustion fan pressure, comparatively advanced control program is adoption rate-Integrated Derivative PID controller control realization, by the real-time pressure feedback of combustion air and operation pressure setting value as the input of PID controller, the difference of PID controller foundation real-time pressure value of feedback and operation pressure setting value regulates the opening degree of combustion fan entrance air-valve, thus realizes the adjustment of combustion air pressure.
But in actual applications, the factors such as rhythm of production, cold blank fill steel, hot blank fills steel, cold and hot blank loads in mixture, it is changeable for determining the actual air quantity of heating furnace, and this pressure feedback just causing combustion air is also changeable.Inventor is realizing finding in process of the present invention: existing control program can produce over control, namely there is the instantaneous phenomenon close to completely open and close in inlet valve, this phenomenon can make furnace pressure occur malleation, or occurs the situation that negative pressure is excessive, 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 and device, furnace pressure can be made in order to solve existing control program to occur malleation owing to producing over control, or there is the situation that the excessive situation negative pressure of negative pressure is excessive, 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, comprising:
Calculate the difference of operation pressure setting value and real-time pressure value of feedback;
When described operation pressure setting value is 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 the incremental number preset, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after described PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly reduce, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback;
When described operation pressure setting value is 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 number that successively decreases preset, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after described PID controller foundation is successively decreased and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to real-time pressure value of feedback.
Preferably, described operation pressure setting value is increased progressively according to the incremental number preset and comprises: described operation pressure setting value is increased progressively according to the incremental number preset and the rule that increases progressively of presetting, the described rule that increases progressively is: operation pressure setting value adds that N is multiplied by default incremental number, wherein, described N is multiplied by the increment value that default incremental number is the N time, N be more than or equal to 1 positive integer.
Preferably, the number that successively decreases that described operation pressure setting value foundation is preset is successively decreased and comprises: described operation pressure setting value is successively decreased according to the rule of successively decreasing counted and preset of successively decreasing preset, described rule of successively decreasing is: operation pressure setting value deducts M and is multiplied by the default number that successively decreases, wherein, described M is multiplied by that to preset the number that successively decreases be the decrement value of the M time, M be more than or equal to 1 positive integer.
Alternatively, in advance the valve openings degree of combustion fan is divided into multiple interval, and the setting valve openings degree corresponding with each interval determines rule, described method also comprises:
When the number of used combustion fan is two, determine the interval belonging to output valve of PID controller, rule is determined according to the valve openings degree corresponding with the interval determined, determine the opening degree of two valves corresponding with two combustion fans, the opening degree according to the valve determined regulates corresponding valve.
Preferably, describedly in advance the valve openings degree of combustion fan is divided into multiple interval, and the setting valve openings degree corresponding with each interval determines that rule comprises: valve openings degree 0%-100% is divided into multiple interval, in each interval, fix a valve openings degree, adjust another valve openings degree.
A kind of heating furnace combustion air pressure control device, comprising: computing unit, the first adjustment unit and the second adjustment unit;
Described computing unit, for calculating the difference of operation pressure setting value and real-time pressure value of feedback;
Described first adjustment unit, for being less than described real-time pressure value of feedback when described operation pressure setting value, and described difference is not when preset range, described operation pressure setting value is increased progressively according to the incremental number preset, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after described PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly reduce, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback;
Described second adjustment unit, for being greater than described real-time pressure value of feedback when described operation pressure setting value, and described difference is not when preset range, described operation pressure setting value is successively decreased according to the number that successively decreases preset, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after described PID controller foundation is successively decreased and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to real-time pressure value of feedback.
Preferably, described first adjustment unit comprises: increase progressively subelement;
Describedly increase progressively subelement, for described operation pressure setting value is increased progressively according to the incremental number preset and the rule that increases progressively of presetting, the described rule that increases progressively is: operation pressure setting value adds that N is multiplied by default incremental number, wherein, described N is multiplied by the increment value that default incremental number is the N time, N be more than or equal to 1 positive integer.
Preferably, described second adjustment unit comprises: successively decrease subelement;
The described subelement that successively decreases, for described operation pressure setting value is successively decreased according to the rule of successively decreasing counted and preset of successively decreasing preset, described rule of successively decreasing is: operation pressure setting value deducts M and is multiplied by the default number that successively decreases, wherein, described M is multiplied by that to preset the number that successively decreases be the decrement value of the M time, M be more than or equal to 1 positive integer.
Preferably, in advance the valve openings degree of combustion fan is divided into multiple interval, and the setting valve openings degree corresponding with each interval determines rule, also comprises: the first determining unit, the second determining unit and valve regulated unit;
Described first determining unit, when being two for working as the number of used combustion fan, determines the interval belonging to output valve of PID controller;
Described second determining unit, for determining rule according to the valve openings degree corresponding with the interval that described first determining unit is determined, determines the valve openings degree corresponding with two blower fans;
Described valve regulated unit, regulates corresponding valve for the valve openings degree determined according to described second determining unit.
A kind of heating furnace combustion air control pressurer system, comprising: pressure transmitter, programmable logic controller (PLC) PLC and PID controller, wherein:
Described pressure transmitter is connected with described PLC, for obtaining real-time pressure value of feedback and the real-time pressure value of feedback of acquisition being inputted described PLC;
Described PLC is connected with described PID controller, for calculating the difference of operation pressure setting value and described real-time pressure value of feedback, when described operation pressure setting value is 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 the incremental number preset, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after described PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, constantly reduce to make real-time pressure value of feedback, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback, when described operation pressure setting value is 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 number that successively decreases preset, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after described PID controller foundation is successively decreased and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to real-time pressure value of feedback,
Described PID controller, for regulating the opening degree of the valve of combustion fan according to the increasing or decreasing force value of PLC output and the difference of real-time pressure value of feedback, to regulate the pressure of combustion air.
Heating furnace combustion air compress control method provided by the invention, Apparatus and system, when the force value change inputting PID controller is excessive, by carrying out increasing or decreasing to technique initialization force value, make the difference control valve opening degree of the force value after PID controller foundation increasing or decreasing and real-time pressure value of feedback, thus make real-time pressure value of feedback close to operation pressure setting value gradually, reduce the deviation of operation pressure and real-time pressure value of feedback, this makes PID controller can be real-time, stable adjustment, overcome the impact that the over control existing for existing PID control program is brought furnace pressure and fuel combustion.In addition, the method that the embodiment of the present invention provides solves PID controller simultaneously to the unmanageable problem of the air-valve of two combustion fans.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
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.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of heating furnace combustion air compress control method, 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 calculating operation pressure setting value and real-time pressure value of feedback.
S102: judge difference whether in preset range, if so, then proceed to step S107, if not, then proceed to step S103.
S103: judge whether operation pressure setting value is less than real-time pressure value of feedback, if so, then proceed to step S104, if not, then proceed to step S105.
It should be noted that, when difference is not in preset range, also first can judges whether operation pressure setting value is greater than real-time pressure value of feedback, if not, then judge whether operation pressure setting value is less than real-time pressure value of feedback.
S104: operation pressure setting value is increased progressively according to presetting incremental number, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly reduce, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback.
S105: judge whether operation pressure setting value is greater than real-time pressure value of feedback, if so, then proceed to step S106, if not, performs other operation.
S106: operation pressure setting value is successively decreased according to presetting the number that successively decreases, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to real-time pressure value of feedback.
S107: the difference control valve opening degree of foundation operation pressure setting value and real-time pressure value of feedback.
Such as, preset range is-600 ~+600, if operation pressure setting value is 8000, real-time pressure value of feedback is 7000, and so, difference is 1000, not in preset range, again because operation pressure setting value is greater than real-time pressure value of feedback, then performs 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, by operation pressure setting value according to preset rules increasing or decreasing, the force value of successively decreasing after being increased progressively by PID controller foundation and the difference of real-time pressure value of feedback regulate the valve openings degree of combustion fan, to make the force value fed back constantly reduce or increase, thus close to operation pressure setting value.
In other embodiments of the invention, force value after increasing progressively is more than or equal to real-time pressure value of feedback, or when the force value after successively decreasing is less than or equal to real-time pressure value of feedback, judge that the difference of operation pressure setting value and real-time pressure value of feedback is now whether in preset range again, if not, then proceed to step S103, until the difference of operation pressure setting value and real-time pressure value of feedback is in preset range.
In another embodiment of the invention, in step S104, operation pressure setting value is increased progressively can comprise according to the first preset rules: operation pressure setting value is increased progressively according to the incremental number preset and the rule that increases progressively of presetting, increasing progressively rule can be: operation pressure setting value adds that N is multiplied by default incremental number, wherein, N is multiplied by the increment value that default incremental number is the N time, N be more than or equal to 1 positive integer.In the present embodiment, the increasing velocity of force value is determined by the actual act situation of valve, increases progressively once as being decided to be every 1 second by actual analysis.
Such as, preset range is-600 ~+600, and operation pressure setting value is 8000, and now, real-time pressure value of feedback is 9000, and the difference of the two is-1000, is less than-600, default increment value is 40, then in the first second, operation pressure setting value 8000 is added that 1*40 obtains 8040, by 8040 input PID controller, PID controller according to 8040 and 9000 difference-960 significantly control valve opening degree, make real-time pressure value of feedback maximal rate close to operation pressure setting value, in the second second, operation pressure setting value 8000 is added that 2*40 obtains 8080, by 8080 input PID controller, 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 regulated, because the force value that constantly increases always is less than real-time pressure value of feedback, therefore valve do not disconnect little, along with not disconnecting of valve is little, the pressure fed back and real-time pressure value of feedback are also in continuous reduction, when N second, when the force value increased progressively is more than or equal to real-time pressure value of feedback, go 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 again, if not, then repeat said process.
In one more embodiment of the present invention, in step S105, operation pressure setting value is successively decreased can comprise according to the second preset rules: operation pressure setting value is successively decreased according to the rule of successively decreasing counted and preset of successively decreasing preset, rule of successively decreasing can be: operation pressure setting value deducts M and is multiplied by the default number that successively decreases, wherein, described M is multiplied by that to preset the number that successively decreases be the decrement value of the M time, M be more than or equal to 1 positive integer.
Such as, operation pressure setting value is 8000, and now, real-time pressure value of feedback is 7000, the difference of the two is 1000, be greater than+600, default decrement value is 40, then in the first second, operation pressure setting value 8000 is deducted 1*40 and obtains 7960, by 7960 input PID controller, PID controller according to 7960 and 7000 difference 960 significantly control valve opening degree, make real-time pressure value of feedback maximal rate close to operation pressure setting value, in the second second, operation pressure setting value 8000 is deducted 2*40 and obtains 7920, by 7920 input PID controller, like this, operation pressure setting value after successively decreasing and the difference of real-time pressure value of feedback can diminish again, the governing speed of PID controller slows down, by that analogy, in the process regulated, because ever-reduced force value is always greater than real-time pressure value of feedback, therefore valve does not disconnect greatly, along with not disconnecting of valve is large, the pressure fed back and real-time pressure value of feedback are also in continuous increase, when M second, when the force value of successively decreasing is less than or equal to real-time pressure value of feedback, go 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 again, if not, then repeat said process.
In the prior art, when use two combustion fans, need the valve openings degree simultaneously regulating two air-valves, this control program makes combustion fan pressure produce very large fluctuation, be difficult to control, in order to solve this problem, in one more embodiment of the present invention, said method also comprises the part being applied to PID controller output, in advance the valve openings degree of combustion fan is divided into multiple interval, and the setting valve openings degree corresponding with each interval determines rule, Fig. 2 gives the schematic flow sheet of the method for the output being applied to PID controller, can comprise:
S201: the number of adding up the combustion fan used.
S202: whether the number of the combustion fan that judgement uses is two, if so, then performs step S202 and subsequent step, and if not, then the output valve pair valve corresponding with dropping into blower fan according to PID regulates.
S203: the interval belonging to output valve determining PID controller.
S204: determine rule according to the valve openings degree corresponding with the interval determined, determine the valve openings degree corresponding with two blower fans.
S205: corresponding valve is regulated according to the valve openings degree determined.
In another embodiment of the present invention, in advance the valve openings degree of combustion fan is divided into multiple interval, and the setting valve openings degree corresponding with each interval determines that rule can be: valve openings degree 0%-100% is divided into multiple interval, 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 belonging to output valve of PID controller, and determine rule according to the valve openings degree corresponding with the interval determined, determine that the valve openings degree corresponding with two blower fans can comprise:
(1) if the output valve <2.5% of 0%<PID controller, the then output valve-0% (this interval minimum of a value) of the opening degree=2*PID controller of valve 1, opening degree=0% (this interval minimum of a value) of valve 2.
(2) if the output valve <5% of 2.5%<PID controller, then opening degree=5% (this interval maximum) of valve 1, the output valve-5% (this interval maximum) of the opening degree=2*PID controller of valve 2.
(3) if the output valve <7.5% of 5%<PID controller, the then output valve-5% (this interval minimum of a value) of the opening degree=2*PID controller of valve 1, opening degree=5% (this interval minimum of a value) of valve 2.
(4) if the output valve <10% of 7.5%<PID controller, then opening degree=10% (this interval maximum) of valve 1, the output valve-10% (this interval maximum) of the opening degree=2*PID controller of valve 2.
(39) if the output valve <97.5% of 95%<PID controller, the then output valve-95% (this interval minimum of a value) of the opening degree=2*PID controller of valve 1, opening degree=95% (this interval minimum of a value) of valve 2.
(40) if the output valve <100% of 97.5%<PID controller, then opening degree=100% (this interval maximum) of valve 1, the output valve-100% (this interval maximum) of the opening degree=2*PID controller of valve 2.
Such as, the output valve of PID controller is 23%, it belongs to 22.5%-25%, and this is interval, so, aperture=the 2*23%-22.5%=23.5 of valve 1, aperture=22.5% of valve 2, 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 and valve openings degree 0%-100% is divided into 40 intervals, and interval quantity can be determined according to practical application.
The heating furnace combustion air compress control method that the embodiment of the present invention provides, when the force value change inputting PID controller is excessive, by carrying out increasing or decreasing to technique initialization force value, make the difference control valve opening degree of the force value after PID controller foundation increasing or decreasing and real-time pressure value of feedback, thus make real-time pressure value of feedback close to operation pressure setting value gradually, reduce the deviation of operation pressure and real-time pressure value of feedback, this makes PID controller can be real-time, stable adjustment, overcome the impact that the over control existing for existing PID control program is brought furnace pressure and fuel combustion.In addition, the method that the embodiment of the present invention provides solves 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 additionally 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, first adjustment unit 12 and the second adjustment unit 13.Wherein:
Computing unit 11, for calculating the difference of operation pressure setting value and real-time pressure value of feedback.
First adjustment unit 12, for being less than real-time pressure value of feedback when operation pressure setting value, and difference is not when preset range, operation pressure setting value is increased progressively according to the incremental number preset, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly reduce, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback.
Second adjustment unit 13, for being greater than real-time pressure value of feedback when operation pressure setting value, and difference is not when preset range, operation pressure setting value is successively decreased according to the number that successively decreases preset, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after PID controller foundation is successively decreased and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to real-time pressure value of feedback.
In another embodiment of the invention, the first adjustment unit can comprise: increase progressively subelement.Increase progressively subelement, for operation pressure setting value being increased progressively according to the incremental number preset and the rule that increases progressively of presetting, increasing progressively rule is: operation pressure setting value adds that N is multiplied by default incremental number, wherein, N is multiplied by the increment value that default incremental number is the N time, N be more than or equal to 1 positive integer.
In one more embodiment of the present invention, the second adjustment unit comprises the subelement that successively decreases.Successively decrease subelement, for operation pressure setting value being successively decreased according to the rule of successively decreasing counted and preset of successively decreasing preset, rule of successively decreasing is: operation pressure setting value deducts M and is multiplied by the default number that successively decreases, wherein, M is multiplied by that to preset the number that successively decreases be the decrement value of the M time, M be more than or equal to 1 positive integer.
In another embodiment of the present invention, said apparatus can also comprise: the first determining unit 21, second determining unit 22 and valve regulated unit 23, as shown in Figure 4.Wherein:
First determining unit 21, for when the number dropping into blower fan is two, determines the interval belonging to output valve of PID controller.Second determining unit 22, for determining rule according to the valve openings degree corresponding with the interval that the first determining unit 21 is determined, determines the valve openings degree corresponding with two blower fans.Valve regulated unit 23, regulates corresponding valve for the valve openings degree determined according to the second determining unit 22.
Wherein, the first determining unit comprises: statistics subelement, judgment sub-unit and first determine subelement.Wherein: statistics subelement, for adding up the number of used combustion fan, judgment sub-unit, for judging whether the number of used combustion fan is two, first determines subelement, for when the number dropping into blower fan is two, determines the interval belonging to 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 change inputting PID controller is excessive, by carrying out increasing or decreasing to technique initialization force value, make the difference control valve opening degree of the force value after PID controller foundation increasing or decreasing and real-time pressure value of feedback, thus make real-time pressure value of feedback close to operation pressure setting value gradually, reduce the deviation of operation pressure and real-time pressure value of feedback, this makes PID controller can be real-time, stable adjustment, overcome the impact that the over control existing for existing PID control program is brought furnace pressure and fuel combustion.In addition, the method that the embodiment of the present invention provides solves PID controller simultaneously to the unmanageable problem of the air-valve of two combustion fans.
The embodiment of the present invention additionally 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) PLC 2 and PID controller 3.Wherein:
Pressure transmitter 1, for obtaining real-time pressure value of feedback and real-time pressure value of feedback being inputted PLC.
PLC 2 is connected with pressure transmitter 1, for calculating the difference of operation pressure setting value and described real-time pressure value of feedback, when operation pressure setting value is less than real-time pressure value of feedback, and difference is not when preset range, operation pressure setting value is increased progressively according to the incremental number preset, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly reduce, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback; When operation pressure setting value is greater than real-time pressure value of feedback, and difference is not when preset range, operation pressure setting value is successively decreased according to the number that successively decreases preset, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after PID controller foundation is successively decreased and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to real-time pressure value of feedback.
PID controller 3 is connected with PLC 2, for regulating the opening degree of the valve of combustion fan according to the increasing or decreasing force value of PLC 2 output and the difference of real-time pressure value of feedback, to regulate the pressure of combustion air.
In another embodiment of the invention, PLC 2 also can judge the number dropping into blower fan, when the number dropping into blower fan is two, determine the interval belonging to output valve of PID controller 3, rule is determined according to the valve openings degree corresponding with the interval determined, determine the valve openings degree corresponding with two blower fans, and according to the valve openings degree determined, corresponding valve is regulated.In the present embodiment, need in advance the valve openings degree of combustion fan to be divided into multiple interval, and the setting valve openings degree corresponding with each interval determines rule, particularly, valve openings degree 0%-100% can be divided into multiple interval, in each interval, fix a valve openings degree, only regulate another valve openings degree.
In one more embodiment of the present invention, said system can also comprise industrial computer.Industrial computer is connected with PLC, 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 change inputting PID controller is excessive, by carrying out increasing or decreasing to technique initialization force value, make the difference control valve opening degree of the force value after PID controller foundation increasing or decreasing and real-time pressure value of feedback, thus make real-time pressure value of feedback close to operation pressure setting value gradually, reduce the deviation of operation pressure and real-time pressure value of feedback, this makes PID controller can be real-time, stable adjustment, overcome the impact that the over control existing for existing PID control program is brought furnace pressure and fuel combustion.In addition, the method that the embodiment of the present invention provides solves PID controller simultaneously to the unmanageable problem of the air-valve of two combustion fans.
For convenience of description, various unit is divided into describe respectively with function when describing above device.Certainly, the function of each unit can be realized in same or multiple software and/or hardware when implementing of the present invention.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Each embodiment in this description all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.System embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple NE.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The present invention can describe in the general context of computer executable instructions, such as program module.Usually, program module comprises the routine, program, object, assembly, data structure etc. that perform particular task or realize particular abstract data type.Also can put into practice the present invention in a distributed computing environment, in these DCEs, be executed the task by the remote processing devices be connected by communication network.In a distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium comprising memory device.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.
The above is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles 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 setting value is 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 the incremental number preset, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after described PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly reduce, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback;
When described operation pressure setting value is 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 number that successively decreases preset, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after described PID controller foundation is successively decreased and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to 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 the incremental number preset and comprises: described operation pressure setting value is increased progressively according to the incremental number preset and the rule that increases progressively of presetting, the described rule that increases progressively is: operation pressure setting value adds that N is multiplied by default incremental number, wherein, described N is multiplied by the increment value that default incremental number is the N time, N be more than or equal to 1 positive integer.
3. method according to claim 1, it is characterized in that, the number that successively decreases that described operation pressure setting value foundation is preset is successively decreased and comprises: described operation pressure setting value is successively decreased according to the rule of successively decreasing counted and preset of successively decreasing preset, described rule of successively decreasing is: operation pressure setting value deducts M and is multiplied by the default number that successively decreases, wherein, described M is multiplied by that to preset the number that successively decreases be the decrement value of the M time, M be more than or equal to 1 positive integer.
4. method according to claim 1, is characterized in that, in advance the valve openings degree of combustion fan is divided into multiple interval, and the setting valve openings degree corresponding with each interval determines rule, and described method also comprises:
When the number of used combustion fan is two, determine the interval belonging to output valve of PID controller, rule is determined according to the valve openings degree corresponding with the interval determined, determine the opening degree of two valves corresponding with two combustion fans, the opening degree according to the valve determined regulates corresponding valve.
5. method according to claim 2, it is characterized in that, when the number of used combustion fan is two, describedly in advance the valve openings degree of combustion fan is divided into multiple interval, and the setting valve openings degree corresponding with each interval determines that rule comprises: valve openings degree 0%-100% is divided into multiple interval, 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, for calculating the difference of operation pressure setting value and real-time pressure value of feedback;
Described first adjustment unit, for being less than described real-time pressure value of feedback when described operation pressure setting value, and described difference is not when preset range, described operation pressure setting value is increased progressively according to the incremental number preset, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after described PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly reduce, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback;
Described second adjustment unit, for being greater than described real-time pressure value of feedback when described operation pressure setting value, and described difference is not when preset range, described operation pressure setting value is successively decreased according to the number that successively decreases preset, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after described PID controller foundation is successively decreased and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to real-time pressure value of feedback.
7. device according to claim 6, is characterized in that, described first adjustment unit comprises: increase progressively subelement;
Describedly increase progressively subelement, for described operation pressure setting value is increased progressively according to the incremental number preset and the rule that increases progressively of presetting, the described rule that increases progressively is: operation pressure setting value adds that N is multiplied by default incremental number, wherein, described N is multiplied by the increment value that default incremental number is the N time, N be more than or equal to 1 positive integer.
8. device according to claim 6, is characterized in that, described second adjustment unit comprises: successively decrease subelement;
The described subelement that successively decreases, for described operation pressure setting value is successively decreased according to the rule of successively decreasing counted and preset of successively decreasing preset, described rule of successively decreasing is: operation pressure setting value deducts M and is multiplied by the default number that successively decreases, wherein, described M is multiplied by that to preset the number that successively decreases be the decrement value of the M time, M be more than or equal to 1 positive integer.
9. device according to claim 6, it is characterized in that, in advance the valve openings degree of combustion fan is divided into multiple interval, and the setting valve openings degree corresponding with each interval determines rule, also comprises: the first determining unit, the second determining unit and valve regulated unit;
Described first determining unit, when being two for working as the number of used combustion fan, determines the interval belonging to output valve of PID controller;
Described second determining unit, for determining rule according to the valve openings degree corresponding with the interval that described first determining unit is determined, determines the valve openings degree corresponding with two blower fans;
Described valve regulated unit, regulates corresponding valve for the valve openings degree determined according to described second determining unit.
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, for obtaining real-time pressure value of feedback and the real-time pressure value of feedback of acquisition being inputted described PLC;
Described PLC is connected with described PID controller, for calculating the difference of operation pressure setting value and described real-time pressure value of feedback, when described operation pressure setting value is 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 the incremental number preset, each force value after increasing progressively is inputted PID controller, the opening degree of the force value after described PID controller foundation is increased progressively and the difference control valve of real-time pressure value of feedback, constantly reduce to make real-time pressure value of feedback, until the force value after increasing progressively is more than or equal to real-time pressure value of feedback, when described operation pressure setting value is 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 number that successively decreases preset, each force value after successively decreasing is inputted PID controller, the opening degree of the force value after described PID controller foundation is successively decreased and the difference control valve of real-time pressure value of feedback, to make real-time pressure value of feedback constantly increase, until the force value after successively decreasing is less than or equal to real-time pressure value of feedback,
Described PID controller, for regulating the opening degree of the valve of combustion fan according to the increasing or decreasing force value of PLC output and the difference of real-time pressure value of feedback, to regulate the pressure of combustion air.
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| CN104775022B (en) * | 2014-01-15 | 2017-04-26 | 宝山钢铁股份有限公司 | Combustion-supporting fan linkage control system and method |
| CN107120677B (en) * | 2017-06-01 | 2020-09-29 | 上海联达节能科技有限公司 | Method and system for automatically controlling combustion-supporting air pressure of heating furnace |
| 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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