CN102966970B - Combustion control system and method for co-combustion and heating of fuel gas and combustion-supporting air - Google Patents
Combustion control system and method for co-combustion and heating of fuel gas and combustion-supporting air Download PDFInfo
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Abstract
The invention provides a combustion control system and method for co-combustion and heating of fuel gas and combustion-supporting air so as to perform flow detection, transduction and control of combustion-supporting air and fuel gas in a combustion system as well as realize temperature detection, transduction and cascade control automatization. The combustion system mainly comprises a temperature transmitter, a flow transmitter, a temperature controller, an amplitude limiter and a flow controller. According to the invention, based on the cascade control principle, a process value and a set value of the temperature in a furnace are compared; with the impact of gas flow on the temperature, a process value and a control value of the flow are compared; and the flow controller is responsible for controlling, computing and outputting a manipulation amount over a flow actuating mechanism, so as to achieve the purpose of automatic control over combustion conditions in a hot-rolling heating furnace and a cold-roll annealing furnace.
Description
Technical field
The present invention relates to automatic temperature control system and the method for a kind of combustion gas and combustion air mixed combustion heating.
Background technology
With combustion gas, as natural gas, mixed gas and combustion air mixed combustion provide heat, be very general method during industrial furnace is produced.Heater for rolling steel is multistage heat-supply type continuous furnace especially, for meeting rolling mill practice demand and heating steel billet system, takes each section of furnace temperature difference to control, and different heating steel billet systems requires have corresponding Control for Kiln Temperature to meet heating steel billet requirement.Cold rolled continuous annealing stove and Continuous Hot Dip Galvanizing Annealing Furnace, by gas fired radiant tubes mode of heating, make to be with steel in annealing furnace, to eliminate rolling stress, improve base material mechanical property.The accurate control of furnace temperature also helps the plate shape of improving in annealing furnace with steel, and band steel heating uniformity, for the high-quality production of rear operation provides safeguard.
For this class complicated production technique, mode cannot meet production requirement manually, need set up the automatic control system of production process.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of combustion control system and method for combustion gas and combustion air mixed combustion heating is provided, realizes the automatic control to the combustion case in hot-rolling heating furnace and cold rolled annealed stove.
The present invention solves the problems of the technologies described above taked technical scheme to be: a kind of combustion control system for combustion gas and combustion air mixed combustion heating, is characterized in that: it comprises:
Temperature transmitter, for identifying temperature course value storage in the industrial burner hearth that temperature sensor gathers;
Flow transmitter, for identifying discharge process value the storage of the conveying gas of flow detector collection;
Temperature controller, for temperature course value and desired temperature are compared and calculated, and the output value of controlling;
Limiter, for the value of controlling is compared and calculated with discharge process value, and output flow controlling value;
Flow controller, for flow-control value and discharge process value are compared and calculated, and output flow control instruction is given corresponding actuator.
Press such scheme, described flow transmitter comprises air mass flow transmitter and gas flow transmitter; Wherein air mass flow transmitter is for air mass flow process values the storage of the conveying air identifying flow detector and gather, and gas flow transmitter is for gas flow process values the storage of the conveying coal gas identifying flow detector and gather;
Described limiter comprises air limiter and coal gas limiter; Wherein air limiter is used for the value of controlling and gas flow process values to compare and calculate, and delivery air flow-control value, and coal gas limiter is for the value of controlling and air mass flow process values are compared and calculated, and output coal gas flow-control value.
Press such scheme, described air limiter specifically comprises:
The first coal gas comparison module, for judging whether MVt < (1+K4) PVg, is MVt if make the value of air capacity upper limit La, makes if not air flow control value SPa=(1+K4) PVg; Wherein MVt is the value of controlling, and K4 is limiter the 4th parameter, and PVg is gas flow process values;
The second coal gas comparison module, while being MVt for the value as air capacity upper limit La, judges whether La > (1-K2) PVg, if make air flow control value SPa=MVt*BU, makes if not air flow control value SPa=(1-K2) PVg; Wherein K2 is limiter the second parameter, and BU is space gas proportioning.
Press such scheme, described coal gas limiter specifically comprises:
The first air comparison module, for judging whether MVt > (1-K3) PVa/BU, is MVt if make the value of coal gas amount upper limit Hg, makes if not gas flow controlling value SPg=(1-K3) PVa/BU; Wherein MVt is the value of controlling, and K3 is limiter the 3rd parameter, and BU is space gas proportioning, and PVa is air mass flow process values;
The second air comparison module, for when the value of coal gas amount upper limit Hg is MVt, judge whether Hg < (1+K1) PVa/BU, if make gas flow controlling value SPg=MVt, make if not air flow control value SPg=(1+K1) PVa/BU; Wherein K1 is limiter the first parameter.
A method for controlling combustion for combustion gas and combustion air mixed combustion heating, is characterized in that: it comprises the following steps:
Temperature course value storage in the industrial burner hearth that identification temperature sensor gathers;
The discharge process value of the conveying gas that identification flow detector gathers storage;
Temperature course value and desired temperature are compared and calculated, and the output value of controlling;
The value of controlling is compared and calculated with discharge process value, and output flow controlling value;
Flow-control value and discharge process value are compared and calculated, and output flow control instruction is given corresponding actuator.
As stated above, described discharge process value comprises air mass flow process values and gas flow process values;
When will the value of controlling comparing and calculating with discharge process value, will the value of controlling and gas flow process values compare and calculate, and delivery air flow-control value; The value of controlling is compared and calculated with air mass flow process values, and output coal gas flow-control value.
As stated above, described compares with gas flow process values the value of controlling and calculate, and the concrete steps of delivery air flow-control value are:
Judging whether MVt < (1+K4) PVg, is MVt if make the value of air capacity upper limit La, makes if not air flow control value SPa=(1+K4) PVg; Wherein MVt is the value of controlling, and K4 is limiter the 4th parameter, and PVg is gas flow process values;
When the value of air capacity upper limit La is MVt, judge whether La > (1-K2) PVg, if make air flow control value SPa=MVt*BU, make if not air flow control value SPa=(1-K2) PVg; Wherein K2 is limiter the second parameter, and BU is space gas proportioning.
As stated above, described compares with air mass flow process values the value of controlling and calculate, and the concrete steps of output coal gas flow-control value are:
Judging whether MVt > (1-K3) PVa/BU, is MVt if make the value of coal gas amount upper limit Hg, makes if not gas flow controlling value SPg=(1-K3) PVa/BU; Wherein MVt is the value of controlling, and K3 is limiter the 3rd parameter, and BU is space gas proportioning, and PVa is air mass flow process values;
When the value of coal gas amount upper limit Hg is MVt, judge whether Hg < (1+K1) PVa/BU, if make gas flow controlling value SPg=MVt, make if not air flow control value SPg=(1+K1) PVa/BU; Wherein K1 is limiter the first parameter.
Beneficial effect of the present invention is:
1, the present invention is based on tandem control principle, temperature course value and system in stove or operator's setting value are compared, and add the impact of gas flow on temperature, controlling value to flow process values and temperature controller output compares, by flow controller, carry out control algorithm, and then export the manipulated variable of flow executing agency (as valve opening), thereby reach the automatic control object to the combustion case in hot-rolling heating furnace and cold rolled annealed stove.
2, further, by adding the impact of this parameter of space gas proportioning on burning, realize Optimal Setting and the adjustment of air excess; According to space gas ratio optimization, set, flow executing agency carries out aperture adjustment action, meanwhile, considers efficiency of combustion and heating effect, carries out safety limit, guarantees burning control efficiently and safety.
3,, by adopting system and method for the present invention, system easily used, easily reuses, easily debugging, easy care.Can to each parameter, carry out setup control according to actual needs, can carry out online adjustment and optimize, improve the adaptive capacity of combustion control system; And the accurately and timely control requirement of operation response person and interconnected system, optimization control combustion process, and can, intuitively to the evaluation of burning control procedure, realize the effect of energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is the structured flowchart of one embodiment of the invention.
Fig. 3 is the gas flow amplitude limit logic diagram in one embodiment of the invention.
Fig. 4 is the air mass flow amplitude limit logic diagram in one embodiment of the invention.
The specific embodiment
Hot rolling continuous furnace and cold rolled continuous annealing stove occupy an important position in iron and steel Rolling Production technique.The task of heating furnace is heating steel billet, makes steel billet temperature and Temperature Distribution thereof meet rolling requirement.The task of annealing furnace is heating steel band, promotes the recrystallization of steel band, in conjunction with the effect of tension force and reducing atmosphere, improves strip surface quality and plate shape.By to the Component units of combustion system and structural parameters appropriate design, thus make efficiency of combustion high, control safety, guarantee high-quality process treatment process in stove, also reach the object of energy-saving and emission-reduction.
Below in conjunction with implement and accompanying drawing the invention will be further described.
Fig. 1 is structured flowchart of the present invention, the structured flowchart that Fig. 2 is one embodiment of the invention, and it comprises: temperature transmitter, for identifying temperature course value storage in the industrial burner hearth that temperature sensor gathers; Flow transmitter, for identifying discharge process value the storage of the conveying gas of flow detector collection; Temperature controller, for temperature course value and desired temperature are compared and calculated, and the output value of controlling; Limiter, for the value of controlling is compared and calculated with discharge process value, and output flow controlling value; Flow controller, for flow-control value and discharge process value are compared and calculated, and output flow control instruction is given corresponding actuator.
In the present embodiment, flow transmitter comprises air mass flow transmitter and gas flow transmitter; Wherein air mass flow transmitter is for air mass flow process values the storage of the conveying air identifying flow detector and gather, and gas flow transmitter is for gas flow process values the storage of the conveying coal gas identifying flow detector and gather.Limiter comprises air limiter and coal gas limiter; Wherein air limiter is used for the value of controlling and gas flow process values to compare and calculate, and delivery air flow-control value, and coal gas limiter is for the value of controlling and air mass flow process values are compared and calculated, and output coal gas flow-control value.
Air limiter specifically comprises: the first coal gas comparison module, for judging whether MVt < (1+K4) PVg, is MVt if make the value of air capacity upper limit La, makes if not air flow control value SPa=(1+K4) PVg; Wherein MVt is the value of controlling, and K4 is limiter the 4th parameter, and PVg is gas flow process values; The second coal gas comparison module, while being MVt for the value as air capacity upper limit La, judges whether La > (1-K2) PVg, if make air flow control value SPa=MVt*BU, makes if not air flow control value SPa=(1-K2) PVg; Wherein K2 is limiter the second parameter, and BU is space gas proportioning.
Coal gas limiter specifically comprises: the first air comparison module, for judging whether MVt > (1-K3) PVa/BU, is MVt if make the value of coal gas amount upper limit Hg, makes if not gas flow controlling value SPg=(1-K3) PVa/BU; Wherein MVt is the value of controlling, and K3 is limiter the 3rd parameter, and BU is space gas proportioning, and PVa is air mass flow process values; The second air comparison module, for when the value of coal gas amount upper limit Hg is MVt, judge whether Hg < (1+K1) PVa/BU, if make gas flow controlling value SPg=MVt, make if not air flow control value SPg=(1+K1) PVa/BU; Wherein K1 is limiter the first parameter.
A method for controlling combustion for combustion gas and combustion air mixed combustion heating, comprises the following steps: temperature course value storage in the industrial burner hearth that identification temperature sensor gathers; The discharge process value of the conveying gas that identification flow detector gathers storage; Temperature course value and desired temperature are compared and calculated, and the output value of controlling; The value of controlling is compared and calculated with discharge process value, and output flow controlling value; Flow-control value and discharge process value are compared and calculated, and output flow control instruction is given corresponding actuator.
Discharge process value comprises air mass flow process values and gas flow process values; When will the value of controlling comparing and calculating with discharge process value, will the value of controlling and gas flow process values compare and calculate, and delivery air flow-control value; The value of controlling is compared and calculated with air mass flow process values, and output coal gas flow-control value.
The value of controlling is compared and calculated with gas flow process values, and the concrete steps of delivery air flow-control value as shown in Figure 4: judge whether MVt < (1+K4) PVg, if making the value of air capacity upper limit La is MVt, make if not air flow control value SPa=(1+K4) PVg; Wherein MVt is the value of controlling, and K4 is limiter the 4th parameter, and PVg is gas flow process values; When the value of air capacity upper limit La is MVt, judge whether La > (1-K2) PVg, if make air flow control value SPa=MVt*BU, make if not air flow control value SPa=(1-K2) PVg; Wherein K2 is limiter the second parameter, and BU is space gas proportioning.
The value of controlling is compared and calculated with air mass flow process values, and the concrete steps of output coal gas flow-control value as shown in Figure 3: judge whether MVt > (1-K3) PVa/BU, if making the value of coal gas amount upper limit Hg is MVt, make if not gas flow controlling value SPg=(1-K3) PVa/BU; Wherein MVt is the value of controlling, and K3 is limiter the 3rd parameter, and BU is space gas proportioning, and PVa is air mass flow process values; When the value of coal gas amount upper limit Hg is MVt, judge whether Hg < (1+K1) PVa/BU, if make gas flow controlling value SPg=MVt, make if not air flow control value SPg=(1+K1) PVa/BU; Wherein K1 is limiter the first parameter.
Flow controller provided by the invention and temperature controller are realized in Basic automation control system, according to on-the-spot actual mechanical process, flow controller self also can independent operating regulates, and also can follow the tracks of as the interior ring of temperature cascade controller, completes to take the control function that temperature is target.Flow-control and temperature cascade are controlled and can be realized unperturbed switching.
In gas flow limiter provided by the present invention, the manipulation value of temperature controller and air mass flow process values carry out amplitude limit computing comparison, the gas flow output of controller, according to comparative result, acts on actual gas flow executing agency in conjunction with combustion parameter air-fuel ratio value; Air mass flow output is according to comparative result, and in conjunction with limiter, the manipulation value of temperature controller and gas flow process values carry out amplitude limit computing comparison, in conjunction with combustion parameter air-fuel ratio value, act on actual air mass flow executing agency.
Limiter provided by the present invention uses structuring control language platform, input comprises the manipulated variable of sky, gas flow data acquisition amount, optimization of air-fuel ratio setting value, amplitude limit model parameter and temperature controller, and output comprises system set-point and the evaluation of burning control procedure of sky, coal gas amount.Structuring control program has been realized model conversion and the control that is input to output.
Claims (6)
1. for a combustion control system for combustion gas and combustion air mixed combustion heating, it is characterized in that: it comprises:
Temperature transmitter, for identifying temperature course value storage in the industrial burner hearth that temperature sensor gathers;
Flow transmitter, for identifying discharge process value the storage of the conveying gas of flow detector collection;
Temperature controller, for temperature course value and desired temperature are compared and calculated, and the output value of controlling;
Limiter, for the value of controlling is compared and calculated with discharge process value, and output flow controlling value;
Flow controller, for flow-control value and discharge process value are compared and calculated, and output flow control instruction is given corresponding actuator;
Described flow transmitter comprises air mass flow transmitter and gas flow transmitter; Wherein air mass flow transmitter is for air mass flow process values the storage of the conveying air identifying flow detector and gather, and gas flow transmitter is for gas flow process values the storage of the conveying coal gas identifying flow detector and gather;
Described limiter comprises air limiter and coal gas limiter; Wherein air limiter is used for the value of controlling and gas flow process values to compare and calculate, and delivery air flow-control value, and coal gas limiter is for the value of controlling and air mass flow process values are compared and calculated, and output coal gas flow-control value.
2. the combustion control system for combustion gas and combustion air mixed combustion heating according to claim 1, is characterized in that: described air limiter specifically comprises:
The first coal gas comparison module, for judging whether MVt < (1+K4) PVg, is MVt if make the value of air capacity upper limit La, makes if not air flow control value SPa=(1+K4) PVg; Wherein MVt is the value of controlling, and K4 is limiter the 4th parameter, and PVg is gas flow process values;
The second coal gas comparison module, while being MVt for the value as air capacity upper limit La, judges whether La > (1-K2) PVg, if make air flow control value SPa=MVt*BU, makes if not air flow control value SPa=(1-K2) PVg; Wherein K2 is limiter the second parameter, and BU is space gas proportioning.
3. the combustion control system for combustion gas and combustion air mixed combustion heating according to claim 1, is characterized in that: described coal gas limiter specifically comprises:
The first air comparison module, for judging whether MVt > (1-K3) PVa/BU, is MVt if make the value of coal gas amount upper limit Hg, makes if not gas flow controlling value SPg=(1-K3) PVa/BU; Wherein MVt is the value of controlling, and K3 is limiter the 3rd parameter, and BU is space gas proportioning, and PVa is air mass flow process values;
The second air comparison module, for when the value of coal gas amount upper limit Hg is MVt, judge whether Hg < (1+K1) PVa/BU, if make gas flow controlling value SPg=MVt, make if not air flow control value SPg=(1+K1) PVa/BU; Wherein K1 is limiter the first parameter.
4. for a method for controlling combustion for combustion gas and combustion air mixed combustion heating, it is characterized in that: it comprises the following steps:
Temperature course value storage in the industrial burner hearth that identification temperature sensor gathers;
The discharge process value of the conveying gas that identification flow detector gathers storage;
Temperature course value and desired temperature are compared and calculated, and the output value of controlling;
The value of controlling is compared and calculated with discharge process value, and output flow controlling value;
Flow-control value and discharge process value are compared and calculated, and output flow control instruction is given corresponding actuator;
Described discharge process value comprises air mass flow process values and gas flow process values;
When will the value of controlling comparing and calculating with discharge process value, will the value of controlling and gas flow process values compare and calculate, and delivery air flow-control value; The value of controlling is compared and calculated with air mass flow process values, and output coal gas flow-control value.
5. the method for controlling combustion for combustion gas and combustion air mixed combustion heating according to claim 4, is characterized in that: described will the value of controlling and gas flow process values compare and calculate, and the concrete steps of delivery air flow-control value are:
Judging whether MVt < (1+K4) PVg, is MVt if make the value of air capacity upper limit La, makes if not air flow control value SPa=(1+K4) PVg; Wherein MVt is the value of controlling, and K4 is limiter the 4th parameter, and PVg is gas flow process values;
When the value of air capacity upper limit La is MVt, judge whether La > (1-K2) PVg, if make air flow control value SPa=MVt*BU, make if not air flow control value SPa=(1-K2) PVg; Wherein K2 is limiter the second parameter, and BU is space gas proportioning.
6. the method for controlling combustion for combustion gas and combustion air mixed combustion heating according to claim 4, is characterized in that: described will the value of controlling and air mass flow process values compare and calculate, and the concrete steps of output coal gas flow-control value are:
Judging whether MVt > (1-K3) PVa/BU, is MVt if make the value of coal gas amount upper limit Hg, makes if not gas flow controlling value SPg=(1-K3) PVa/BU; Wherein MVt is the value of controlling, and K3 is limiter the 3rd parameter, and BU is space gas proportioning, and PVa is air mass flow process values;
When the value of coal gas amount upper limit Hg is MVt, judge whether Hg < (1+K1) PVa/BU, if make gas flow controlling value SPg=MVt, make if not air flow control value SPg=(1+K1) PVa/BU; Wherein K1 is limiter the first parameter.
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| CN104794875A (en) * | 2015-05-08 | 2015-07-22 | 南通长航船舶配件有限公司 | Oxygen flow regulation loop of boiler combustion regulation system for ship |
| CN111428955B (en) * | 2019-01-10 | 2023-09-01 | 嘉峪关大友嘉能精碳科技股份有限公司 | Method for controlling carbon black combustion temperature by using coal gas and natural gas mixed combustion model |
| CN112859961B (en) * | 2021-01-13 | 2022-05-31 | 首钢京唐钢铁联合有限责任公司 | Heating furnace and control method and control system for temperature of heating furnace |
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| CN101029737A (en) * | 2006-03-17 | 2007-09-05 | 广州迪森热能设备有限公司 | Petroleum coking-slurry burning control system |
| CN101892338A (en) * | 2010-07-22 | 2010-11-24 | 首钢总公司 | Constant wind temperature control system for hot blast stove |
| CN102000814A (en) * | 2010-11-11 | 2011-04-06 | 上海安可科技有限公司 | Cascade variable double amplitude limit temperature control system in ladle baking control and method |
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| JP2616437B2 (en) * | 1994-04-27 | 1997-06-04 | 株式会社ノーリツ | Water heater drainage plug leak detector |
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|---|---|---|---|---|
| US6035810A (en) * | 1995-11-29 | 2000-03-14 | Powertech Industries Inc. | Pulse combustor and boiler for same |
| CN101029737A (en) * | 2006-03-17 | 2007-09-05 | 广州迪森热能设备有限公司 | Petroleum coking-slurry burning control system |
| CN101892338A (en) * | 2010-07-22 | 2010-11-24 | 首钢总公司 | Constant wind temperature control system for hot blast stove |
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