CN103363804A - Method and system for controlling flow of sintering ignition furnace - Google Patents
Method and system for controlling flow of sintering ignition furnace Download PDFInfo
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- CN103363804A CN103363804A CN201310322104XA CN201310322104A CN103363804A CN 103363804 A CN103363804 A CN 103363804A CN 201310322104X A CN201310322104X A CN 201310322104XA CN 201310322104 A CN201310322104 A CN 201310322104A CN 103363804 A CN103363804 A CN 103363804A
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Abstract
The embodiment of the invention discloses a method and a system for controlling the flow of a sintering ignition furnace. The method comprises the following steps of determining bellows target flow according to the actual air inlet amount of the ignition furnace; acquiring the bellows actual flow of a bellows; comparing the bellows target flow and the bellows actual flow to obtain bellows flow offset; and correspondingly adjusting the opening degree of a bellows valve according to the bellows flow offset. The opening degree of the bellows valve can correctly and timely correspond to the actual working environment by acquiring the bellows actual flow of the bellows, comparing the bellows actual flow and the bellows target flow which is related to the actual air inlet amount of a hearth of the ignition furnace, and adjusting the opening degree of the bellows valve according to the comparison result, so that the air inlet amount and the air outlet amount of the hearth are kept balanced.
Description
Technical field
The present invention relates to sintering art, particularly relate to a kind of sintering ignition furnace flow control methods and system.
Background technology
In sintering process, the mix surface that ignition furnace is used on the sintering pallet provides hot strip flame, make solid fuel ignition wherein, and make top layer compound sintering under ignition furnace high-temperature flue gas and solid fuel ignition exothermic effects, the heat that provides sufficient amount of oxygen and negative pressure that the top layer is put aside by the air exhauster exhausting simultaneously is passed to lower one deck compound, sintering process is along with the operation of sintering machine is carried out downwards gradually thereby the solid fuel that impels lower one deck burns away, and then finishes sintering process.
Under the draft effect of air exhauster, flue gas in the ignition furnace burner hearth enters large flue through the many groups bellows that the certain thickness bed of material arranged and be positioned under the ignition furnace on the sintering machine, finally be pumped, bellows are that the sintering machine bilateral symmetry is arranged, bellows are provided with air door adjusting valve, the both sides bellows move simultaneously during same group of bellows control valve action, the same group of bellows valve opening that can forever guarantee both sides is identical, be used for regulating combustion chamber draft during general production, basic is the aperture size of regulating the bellows valve according to the condition of production manual operation of reality, the mode of this manual adjustments has certain limitation, in some bursts or in particular cases can cause the fluctuation of combustion chamber draft, cause simultaneously the rapid variation of fire box temperature, at this moment need to adjust targetedly rapidly the parameters of ignition furnace, such as combustion gas and air inlet amount or flue gas rate of air sucked in required, and obviously can't adapt to and be competent at these bursts or special circumstances by this untimely coarse adjustment mode of manual adjustments bellows valve opening and then adjustment flue gas rate of air sucked in required, can cause unnecessary loss to sintering work thus, such as when the bellows valve opening is adjusted excessive, main exhausting system can be taken away the gas and the heat that are used for burning in the burner hearth in a large number, safeguard that the temperature in the burner hearth just must add the interior gas inlet amount of large pipeline, has caused great combustion gas waste; Main exhauster is taken a large amount of unnecessary flue gases away simultaneously, has also caused the service load of self to strengthen and waste of energy.
Summary of the invention
Control the technical problem that the flue gas rate of air sucked in required can't effectively be finished sintering work in order to solve above-mentioned manual adjustment bellows valve opening, the invention provides a kind of sintering ignition furnace flow control methods and system.
The embodiment of the invention discloses following technical scheme:
A kind of sintering ignition furnace flow control methods comprises:
Determine the bellows target flow according to the actual air inflow of ignition furnace;
Gather the bellows actual flow of bellows;
Compare described bellows target flow and described bellows actual flow obtains the bellows flow deviation;
According to the corresponding aperture of adjusting the bellows valve of described bellows flow deviation.
Preferably, the actual air inflow of described ignition furnace is specially according to the first gas flow FI by igniting pipeline inlet point stove burner hearth
Combustion 1With the first air mass flow FI
Empty 1And the second gas flow FI that passes through pitot tube inlet point stove burner hearth
Combustion 2With the second air mass flow FI
Empty 2Calculate.
Preferably, first gas flow and first air mass flow and second gas flow by pitot tube inlet point stove burner hearth and second air mass flow of described basis by igniting pipeline inlet point stove burner hearth calculated and specifically comprised:
When the ratio of the air fuel gas flow in entering into the ignition furnace burner hearth equals the standard air-fuel ratio, then there are not superfluous air and combustion gas in the decision-point stove burner hearth;
The actual air inflow of described ignition furnace: FI
In=C(FI
Combustion 1+ FI
Combustion 2);
Wherein C is combustion gas corresponding exhaust gas volumn constant when fully burning.
Preferably, first gas flow and first air mass flow and second gas flow by pitot tube inlet point stove burner hearth and second air mass flow of described basis by igniting pipeline inlet point stove burner hearth calculated and specifically comprised:
The ratio of the air fuel gas flow in entering into the ignition furnace burner hearth is during greater than the standard air-fuel ratio, then air excess in the decision-point stove burner hearth;
The actual air inflow of described ignition furnace:
FI
In=C(FI
Combustion 1+ FI
Combustion 2)+[FI
Empty 1+ FI
Empty 2-δ (FI
Combustion 1+ FI
Combustion 2)]
Wherein C is the exhaust gas volumn constant of combustion gas when fully burning;
Wherein δ is the air-fuel ratio coefficient of combustion gas when fully burning.
Preferably, first gas flow and first air mass flow and second gas flow by pitot tube inlet point stove burner hearth and second air mass flow of described basis by igniting pipeline inlet point stove burner hearth calculated and specifically comprised:
The ratio of the air fuel gas flow in entering into the ignition furnace burner hearth is during less than the standard air-fuel ratio, and then combustion gas is superfluous in the decision-point stove burner hearth;
The actual air inflow of described ignition furnace:
Wherein C is the exhaust gas volumn constant of combustion gas when fully burning;
Wherein δ is the air-fuel ratio coefficient of combustion gas when fully burning.
Preferably, describedly determine that according to the actual air inflow of ignition furnace the bellows target flow also comprises the disturbance link, described disturbance link is specially:
Obtain burner hearth target negative pressure according to ignition furnace work at present task;
Collection point stove burner hearth actual suction pressure;
Compare described burner hearth target negative pressure and described burner hearth actual suction pressure acquisition point combustion chamber draft deviation;
Calculate described combustion chamber draft deviation with adjust coefficient long-pendingly obtain the adjustment flow that disturbance causes;
Difference according to the actual air inflow of described ignition furnace and described adjustment flow is determined the bellows target flow.
A kind of sintering ignition furnace flow control system comprises:
Bellows target flow the first determining unit is used for determining the bellows target flow according to the actual air inflow of ignition furnace;
Bellows actual flow collecting unit is for the bellows actual flow that gathers bellows;
Bellows flow deviation computing unit is used for comparing described bellows target flow and described bellows actual flow obtains the bellows flow deviation;
Bellows valve opening adjustment unit is used for according to the corresponding aperture of adjusting the bellows valve of described bellows flow deviation.
Preferably, described bellows target flow the first determining unit also comprises actual air inflow computing unit:
Described actual air inflow computing unit is used for according to the first gas flow FI by igniting pipeline inlet point stove burner hearth
Combustion 1With the first air mass flow FI
Empty 1And the second gas flow FI that passes through pitot tube inlet point stove burner hearth
Combustion 2With the second air mass flow FI
Empty 2Calculate the actual air inflow of described ignition furnace.
Preferably, also comprise the disturbance unit:
Described disturbance unit specifically comprises:
Burner hearth target negative pressure determining unit is used for obtaining burner hearth target negative pressure according to ignition furnace work at present task;
Burner hearth actual suction pressure collecting unit is used for collection point stove burner hearth actual suction pressure;
Combustion chamber draft deviation computing unit is used for comparing described burner hearth target negative pressure and described burner hearth actual suction pressure acquisition point combustion chamber draft deviation;
Adjust the flow rate calculation unit, be used for calculating described combustion chamber draft deviation with adjust coefficient long-pendingly obtain the adjustment flow that disturbance causes;
Bellows target flow the second determining unit is used for determining the bellows target flow according to the difference of the actual air inflow of described ignition furnace and described adjustment flow.
Can be found out by technique scheme, by gathering the actual flow of bellows, and with compare according to the relevant bellows target flow of the actual air inflow of ignition furnace burner hearth, result according to comparison comes corresponding adjustment bellows valve opening size, thus so that the aperture size of bellows valve can with actual working environment accurately, corresponding timely, allow the air inflow of burner hearth and capacity keep balance.
Description of drawings
In order to be illustrated more clearly in the embodiment of the 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 the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method flow schematic diagram of a kind of sintering ignition furnace flow control methods of the present invention;
Fig. 2 is another method flow schematic diagram of a kind of sintering ignition furnace flow control methods of the present invention;
Fig. 3 is bellows flow Automatic Control Theory block diagram of the present invention;
Fig. 4 is the system architecture schematic diagram of a kind of sintering ignition furnace flow control system of the present invention;
Fig. 5 is another system architecture schematic diagram of a kind of sintering ignition furnace flow control system of the present invention;
Fig. 6 is another system architecture schematic diagram of a kind of sintering ignition furnace flow control system of the present invention.
The specific embodiment
The embodiment of the invention provides manner of execution and the system of response message.At first, by gathering the actual flow of bellows, and with compare according to the relevant bellows target flow of the actual air inflow of ignition furnace burner hearth, result according to comparison comes corresponding adjustment bellows valve opening size, thus so that the aperture size of bellows valve can with actual working environment accurately, corresponding timely, allow the air inflow of burner hearth and capacity keep balance.
Secondly, consider various factors to the impact of calculation level stove burner hearth air inflow, to enter the combustion gas of burner hearth and air capacity and carry out COMPREHENSIVE CALCULATING by combustion gas and air capacity that pitot tube enters burner hearth by the igniting pipeline, and the impact that calculation level stove burner hearth air inflow is caused of the different combustion cases that cause of the ratio of considering simultaneously different air fuel gas, obtain thus the more accurately actual air inflow of burner hearth.
At last, in view of burner hearth reality also can produce certain impact into and out of the size of tolerance to the variation of combustion chamber draft, therefore with the negative pressure variation of the burner hearth disturbance factor as the burner hearth gas output, to the flow-control of ignition furnace burner hearth accurate and effective more.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Embodiment one
See also Fig. 1, it may further comprise the steps for the method flow schematic diagram of a kind of sintering ignition furnace flow control methods of the present invention, the method:
S101: determine the bellows target flow according to the actual air inflow of ignition furnace;
When the actual air inflow of calculation level stove, not only need to consider the combustion gas and the air that enter from the igniting pipeline, also to consider simultaneously combustion gas and the air that enters from pitot tube, perhaps to consider the actual impact that combustion chamber draft is changed into and out of tolerance, also or further, consider that simultaneously combustion chamber draft and different pipeline enter combustion gas and the air capacity of burner hearth, based on these three kinds of different embodiments, will in follow-up embodiment two and embodiment three, be described in detail.
Certainly, the calculating preparation method of the actual air inflow of ignition furnace in this step both can be based under above-mentioned three kinds of different embodiments and obtain, also can be by other means or prior art obtain.
S102: the bellows actual flow that gathers bellows;
The bellows of ignition furnace generally are installed in the below of ignition furnace, be used for going out with material surface ignition burning on the chassis under the ignition furnace and through the fume emission of the bed of material by air exhauster, flow detector is laid at air inlet place at bellows, generally for one group of bellows two checkout gears are arranged, the flow number addition that two checkout gears are detected namely is the actual flow value of these group bellows.
For what S101 and S102 need to further specify be, when the present embodiment is carried out S101 and S102 there is no sequencing minute, also can carry out simultaneously.
S103: compare described bellows target flow and described bellows actual flow obtains the bellows flow deviation;
In general ignition furnace disposes many group bellows, the environment of the air outlet of bellows also is not quite similar, that is to say, need to be according to actual condition, the bellows target flow of determining assigned to as total flow respectively organize bellows, can divide equally definite bellows target flow for the bellows of identical air draft power, also can respectively organize according to the actual air draft ability pro-rata of bellows the bellows target flow of bellows.
S104: according to the corresponding aperture of adjusting the bellows valve of described bellows flow deviation.
That is to say, if the bellows flow deviation be on the occasion of, be that the bellows target flow is during greater than the bellows actual flow, show that current actual waste gas discharge rate is less than the target discharge rate, need to tune up the bellows valve opening for this situation increases toxic emission speed with this, reduces toxic emission speed otherwise then turn the bellows valve opening down with this.
Can be found out by the present embodiment, by gathering the actual flow of bellows, and with compare according to the relevant bellows target flow of the actual air inflow of ignition furnace burner hearth, result according to comparison comes corresponding adjustment bellows valve opening size, thus so that the aperture size of bellows valve can with actual working environment accurately, corresponding timely, allow the air inflow of burner hearth and capacity keep balance.
Embodiment two
On the basis of embodiment one, the present embodiment will be described in detail combustion gas and the actual air inflow of air capacity calculating ignition furnace that enters burner hearth according to different pipelines.
That is to say, the actual air inflow of described ignition furnace is specially according to the first gas flow FI by igniting pipeline inlet point stove burner hearth
Combustion 1With the first air mass flow FI
Empty 1And the second gas flow FI that passes through pitot tube inlet point stove burner hearth
Combustion 2With the second air mass flow FI
Empty 2Calculate.
When calculating, to accurately consider the combustion case in the burner hearth, the Main Basis of determining combustion case is the size that enters the air-fuel ratio of burner hearth, the ratio of air and combustion gas namely, in general, air-fuel ratio when the process Air combustion gas of burning can both exhaust fully is the standard air-fuel ratio when air and combustion gas can fully be burnt namely, when the current air-fuel ratio of burner hearth during greater than this standard air-fuel ratio, show that namely the burner hearth Air is superfluous, when the current air-fuel ratio of burner hearth during less than the standard air-fuel ratio, show that namely the burner hearth Air is not enough, combustion gas is superfluous.Corresponding these three kinds of combustion cases that may occur have following different account form.
When the air fuel gas flow-rate ratio in the ignition furnace burner hearth equals the standard air-fuel ratio, then there are not superfluous air and combustion gas in the decision-point stove burner hearth;
The actual air inflow of described ignition furnace: FI
In=C(FI
Combustion 1+ FI
Combustion 2);
Wherein C is combustion gas corresponding exhaust gas volumn constant when fully burning.
Here need to prove, for different types of combustion gas type, such as when coke-stove gas or natural gas, the exhaust gas volumn constant is different, when the combustion gas type is blast furnace gas:
FI
In is high=C
High(FI
Combustion 1+ FI
Combustion 2)
C wherein
HighThe corresponding exhaust gas volumn constant that produces when fully burning for blast furnace gas.
In like manner, when combustion gas was coke-stove gas, natural gas, coal gas of converter, propane, the flue gas value of generation was:
FI
In is burnt=C
Burnt(FI
Combustion 1+ FI
Combustion 2)
FI
In is natural=C
Natural(FI
Combustion 1+ FI
Combustion 2)
FI
In turns=C
Turn(FI
Combustion 1+ FI
Combustion 2)
FI
In propane=C
Propane(FI
Combustion 1+ FI
Combustion 2)
When using combustion gas, ignition furnace is mixed gas, then:
FI
In mixes=S
TurnFI
In turns+ S
PropaneFI
In propane+ S
HighFI
In is high+ S
BurntFI
In is burnt+ S
NaturalFI
In is natural
S wherein
xBe x combustion gas shared percent by volume in this air mixture.
When the air fuel gas flow-rate ratio in the ignition furnace burner hearth during greater than the standard air-fuel ratio, air excess in the decision-point stove burner hearth then;
The actual air inflow of described ignition furnace:
FI
In=C(FI
Combustion 1+ FI
Combustion 2)+[FI
Empty 1+ FI
Empty 2-δ (FI
Combustion 1+ FI
Combustion 2)]
Wherein C is the exhaust gas volumn constant of combustion gas when fully burning;
Wherein δ is the air-fuel ratio coefficient of combustion gas when fully burning.
When ignition furnace uses combustion gas to be respectively blast furnace gas, coke-stove gas, natural gas, coal gas of converter, propane, then
FI
In is high=C
High(FI
Combustion 1+ FI
Combustion 2)+[FI
Empty 1+ FI
Empty 2-δ
High(FI
Combustion 1+ FI
Combustion 2)]
FI
In is burnt=C
Burnt(FI
Combustion 1+ FI
Combustion 2)+[FI
Empty 1+ FI
Empty 2-δ
Burnt(FI
Combustion 1+ FI
Combustion 2)]
FI
In is natural=C
Natural(FI
Combustion 1+ FI
Combustion 2)+[FI
Empty 1+ FI
Empty 2-δ
Natural(FI
Combustion 1+ FI
Combustion 2)]
FI
In turns=C
Turn(FI
Combustion 1+ FI
Combustion 2)+[FI
Empty 1+ FI
Empty 2-δ
Turn(FI
Combustion 1+ FI
Combustion 2)]
FI
In propane=C
Propane(FI
Combustion 1+ FI
Combustion 2)+[FI
Empty 1+ FI
Empty 2-δ
Propane(FI
Combustion 1+ FI
Combustion 2)]
δ wherein
xAir-fuel ratio coefficient when fully burning for the x combustion gas.
When ignition furnace uses combustion gas as air mixture, then:
FI
In mixes=S
TurnFI
In turns+ S
HighFI
In is high+ S
BurntFI
In is burnt+ S
NaturalFI
In is natural+ S
PropaneFI
In propane
S wherein
xBe x combustion gas shared percent by volume in this air mixture.
When the air fuel gas flow-rate ratio in the ignition furnace burner hearth during less than the standard air-fuel ratio, then combustion gas is superfluous in the decision-point stove burner hearth;
The actual air inflow of described ignition furnace:
Wherein C is the exhaust gas volumn constant of combustion gas when fully burning;
Wherein δ is the air-fuel ratio coefficient of combustion gas when fully burning.
When ignition furnace uses combustion gas to be respectively blast furnace gas, coke-stove gas, natural gas, coal gas of converter, propane, then
δ wherein
xAir-fuel ratio coefficient when fully burning for the x combustion gas.
When ignition furnace uses combustion gas as air mixture, then:
FI
In mixes=S
TurnFI
In turns+ S
HighFI
In is high+ S
BurntFI
In is burnt+ S
NaturalFI
In is natural+ S
PropaneFI
In propane
S wherein
xBe x combustion gas shared percent by volume in this air mixture.
As can be seen from the above-described embodiment, at first, by gathering the actual flow of bellows, and with compare according to the relevant bellows target flow of the actual air inflow of ignition furnace burner hearth, result according to comparison comes corresponding adjustment bellows valve opening size, thus so that the aperture size of bellows valve can with actual working environment accurately, corresponding timely, allow the air inflow of burner hearth and capacity keep balance.
Secondly, consider various factors to the impact of calculation level stove burner hearth air inflow, to enter the combustion gas of burner hearth and air capacity and carry out COMPREHENSIVE CALCULATING by combustion gas and air capacity that pitot tube enters burner hearth by the igniting pipeline, and the impact that calculation level stove burner hearth air inflow is caused of the different combustion cases that cause of the ratio of considering simultaneously different air fuel gas, obtain thus the more accurately actual air inflow of burner hearth.
Embodiment three
In view of burner hearth reality also can produce certain impact into and out of the size of tolerance to the variation of combustion chamber draft, on the basis of embodiment one, the present embodiment will be described in detail a disturbance factor of calculating as a whole according to combustion chamber draft, namely disturbance link, see also Fig. 2, it is for another method flow schematic diagram of a kind of sintering ignition furnace flow control methods of the present invention.
Describedly determine that according to the actual air inflow of ignition furnace the bellows target flow also comprises the disturbance link, described disturbance link is specially:
S201: obtain burner hearth target negative pressure according to ignition furnace work at present task;
Here need to prove, different tasks has different goal-selling requirements to combustion chamber draft, has just given unnecessary details no longer one by one here.
S202: collection point stove burner hearth actual suction pressure;
S203: compare described burner hearth target negative pressure and described burner hearth actual suction pressure acquisition point combustion chamber draft deviation;
S204: calculate described combustion chamber draft deviation with adjust coefficient long-pendingly obtain the adjustment flow that disturbance causes;
S205: the difference according to the actual air inflow of described ignition furnace and described adjustment flow is determined the bellows target flow.
The meaning of introducing the disturbance link is, the variation of the factors such as inleakage of sintering machine speed, sintering machine is caused that the variation of negative pressure introduces automatically control.Because when inlet-outlet flow balance, in gas permeability preferably in the situation, the variation of the variation of sintering machine speed, exhausting system condition and the variation of air leakage rate of sintering machine etc. all can cause the rapid variation of combustion chamber draft, at this moment, introduce negative pressure as disturbance factor, can calculate fast the aim parameter that adjusts throughput, only need the actual flow-control of giving vent to anger is stablized, can reach new flow-control balance.
Simultaneously, determine the bellows target flow for S205, the actual air inflow of having obtained is deducted the adjustment flow that disturbance that the disturbance link determines causes just can determine further more accurately bellows target flow.
Preferred embodiment of the invention scheme is on the basis based on embodiment two, thereby namely confirm under the prerequisite of the actual air inflow of ignition furnace in the combustion gas and the air capacity that enter burner hearth by considering different pipelines, further combustion chamber draft is changed and consider at the same time that combustion chamber draft and different pipeline enter under the gas-air amount of burner hearth and determine the bellows target flow calculating the impact of burner hearth target gas output, that is to say.For this preferred embodiment, see also Fig. 3, it is bellows flow Automatic Control Theory block diagram of the present invention, ading up to two groups and be described as example going out bellows that throughput controls, comprises 1# bellows and 2# bellows, and idiographic flow comprises:
At first in the disturbance link, subtracter 30 calculates combustion chamber draft deviation delta E10 according to burner hearth actual suction pressure PI10 and the burner hearth target negative pressure P_sv of input, and multiplier 31 calculates the adjustment flow that disturbance causes according to combustion chamber draft deviation delta E10 and adjustment coefficient k.
Under based on the numerical procedure of embodiment two, calculate actual air inflow FI by the thermal technology
In, subtracter 32 is according to actual air inflow FI
InObtain the bellows target flow with described adjustment flow rate calculation, the bellows target flow here specifically pointer is the general objective flow of 1# bellows and 2# bellows to two groups of bellows, this general objective flow input divider 33, divider 33 reasonably is assigned to 1# and 2# bellows according to actual power and the actual air draft ability of these two groups of bellows with the general objective flow, as the invention target flow of these two groups of bellows, namely export targetedly 1# bellows target flow P_sv21 and 2# bellows target flow P_sv22.
For the 1# bellows, subtracter 34 calculates 1# bellows flow deviation Δ E21 according to the 1# bellows target flow P_sv21 of input and the 1# bellows actual flow FI21 that obtains by flow detector, and adjuster 35 is adjusted the aperture size of 1# bellows valve according to the control 1# bellows control valve big or small and positive and negative correspondence of 1# bellows flow deviation Δ E21.
In like manner, for the 2# bellows, subtracter 36 calculates 2# bellows flow deviation Δ E22 according to the 2# bellows target flow F_sv22 of input and the 2# bellows actual flow FI22 that obtains by flow detector, and adjuster 37 is adjusted the aperture size of 2# bellows valve according to the control 2# bellows control valve big or small and positive and negative correspondence of 2# bellows flow deviation Δ E22.
Generally, when change of external conditions causes that combustion chamber draft PI10 changes, the difference Δ E10 of burner hearth target negative pressure P_sv and actual suction pressure PI10 and the long-pending target flow that can automatically adjust the bellows flow of adjusting coefficient k, adjuster 21,22 re-execute computing output control and regulation valve, and control system will enter new flow equilibrium state.When actual suction pressure PI10 diminished, Δ E10 became large in the disturbance link, becomes large with the product of adjusting coefficient k, thereby actual air inflow FI is arranged
InDiminish with the difference of disturbance link, namely the target gas output should reduce; And actual suction pressure PI10 just in time need to reduce the burner hearth gas output when diminishing can be towards increasing the control of negative pressure direction.Otherwise when actual suction pressure PI10 increased, the target gas output should be towards the direction control that increases.
As can be seen from the above-described embodiment, at first, by gathering the actual flow of bellows, and with compare according to the relevant bellows target flow of the actual air inflow of ignition furnace burner hearth, result according to comparison comes corresponding adjustment bellows valve opening size, thus so that the aperture size of bellows valve can with actual working environment accurately, corresponding timely, allow the air inflow of burner hearth and capacity keep balance.
Secondly, consider various factors to the impact of ignition furnace burner hearth air inflow, to enter the combustion gas of burner hearth and air capacity and carry out COMPREHENSIVE CALCULATING by combustion gas and air capacity that pitot tube enters burner hearth by the igniting pipeline, and the impact that calculation level stove burner hearth air inflow is caused of the different combustion cases that cause of the ratio of considering simultaneously different air fuel gas, obtain thus the more accurately actual air inflow of burner hearth.
At last, in view of burner hearth reality also can produce certain impact into and out of the size of tolerance to the variation of combustion chamber draft, therefore with the negative pressure variation of the burner hearth disturbance factor as the actual gas output of burner hearth, to the flow-control of ignition furnace burner hearth accurate and effective more.
Embodiment four
See also such as Fig. 4, it is the system architecture schematic diagram of a kind of sintering ignition furnace flow control system of the present invention, comprising:
Bellows target flow the first determining unit 401 is used for determining the bellows target flow according to the actual air inflow of ignition furnace;
Preferably, aforementioned device shown in Figure 4 can also comprise actual air inflow computing unit 501, as shown in Figure 5:
Described bellows target flow the first determining unit also comprises actual air inflow computing unit 501:
Described actual air inflow computing unit 501 is used for according to the first gas flow FI by igniting pipeline inlet point stove burner hearth
Combustion 1With the first air mass flow FI
Empty 1And the second gas flow FI that passes through pitot tube inlet point stove burner hearth
Combustion 2With the second air mass flow FI
Empty 2Calculate the actual air inflow of described ignition furnace.
Preferably, can also comprise disturbance unit 601, as shown in Figure 6:
Described disturbance unit 601 specifically comprises:
Burner hearth target negative pressure determining unit 6011 is used for obtaining burner hearth target negative pressure according to ignition furnace work at present task;
Burner hearth actual suction pressure collecting unit 6012 is used for collection point stove burner hearth actual suction pressure;
Combustion chamber draft deviation computing unit 6013 is used for comparing described burner hearth target negative pressure and described burner hearth actual suction pressure acquisition point combustion chamber draft deviation;
Adjust flow rate calculation unit 6014, be used for calculating described combustion chamber draft deviation with adjust coefficient long-pendingly obtain the adjustment flow that disturbance causes;
Bellows target flow the second determining unit 6015 is used for determining the bellows target flow according to the actual air inflow of described ignition furnace and described adjustment flow.
Bellows actual flow collecting unit 402 is for the bellows actual flow that gathers bellows;
Bellows flow deviation computing unit 403 is used for comparing described bellows target flow and described bellows actual flow obtains the bellows flow deviation;
Bellows valve opening adjustment unit 404 is used for according to the corresponding aperture of adjusting the bellows valve of described bellows flow deviation.
As can be seen from the above-described embodiment, at first, by gathering the actual flow of bellows, and with compare according to the relevant bellows target flow of the actual air inflow of ignition furnace burner hearth, result according to comparison comes corresponding adjustment bellows valve opening size, thus so that the aperture size of bellows valve can with actual working environment accurately, corresponding timely, allow the air inflow of burner hearth and capacity keep balance.
Secondly, consider various factors to the impact of ignition furnace burner hearth air inflow, to enter the combustion gas of burner hearth and air capacity and carry out COMPREHENSIVE CALCULATING by combustion gas and air capacity that pitot tube enters burner hearth by the igniting pipeline, and the impact that calculation level stove burner hearth air inflow is caused of the different combustion cases that cause of the ratio of considering simultaneously different air fuel gas, obtain thus the more accurately actual air inflow of burner hearth.
At last, in view of burner hearth reality also can produce certain impact into and out of the size of tolerance to the variation of combustion chamber draft, therefore with the negative pressure variation of the burner hearth disturbance factor as the actual gas output of burner hearth, to the flow-control of ignition furnace burner hearth accurate and effective more.
Need to prove, one of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above a kind of sintering ignition furnace flow control methods provided by the present invention and system are described in detail, used specific embodiment herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a sintering ignition furnace flow control methods is characterized in that, comprising:
Determine the bellows target flow according to the actual air inflow of ignition furnace;
Gather the bellows actual flow of bellows;
Compare described bellows target flow and described bellows actual flow obtains the bellows flow deviation;
According to the corresponding aperture of adjusting the bellows valve of described bellows flow deviation.
2. method according to claim 1 is characterized in that,
The actual air inflow of described ignition furnace is specially according to the first gas flow FI by igniting pipeline inlet point stove burner hearth
Combustion 1With the first air mass flow FI
Empty 1And the second gas flow FI that passes through pitot tube inlet point stove burner hearth
Combustion 2With the second air mass flow FI
Empty 2Calculate.
3. method according to claim 2, it is characterized in that, first gas flow and first air mass flow and second gas flow by pitot tube inlet point stove burner hearth and second air mass flow of described basis by igniting pipeline inlet point stove burner hearth calculated and specifically comprised:
When the ratio of the air fuel gas flow in entering into the ignition furnace burner hearth equals the standard air-fuel ratio, then there are not superfluous air and combustion gas in the decision-point stove burner hearth;
The actual air inflow of described ignition furnace: FI
In=C(FI
Combustion 1+ FI
Combustion 2);
Wherein C is combustion gas corresponding exhaust gas volumn constant when fully burning.
4. method according to claim 2, it is characterized in that, first gas flow and first air mass flow and second gas flow by pitot tube inlet point stove burner hearth and second air mass flow of described basis by igniting pipeline inlet point stove burner hearth calculated and specifically comprised:
The ratio of the air fuel gas flow in entering into the ignition furnace burner hearth is during greater than the standard air-fuel ratio, then air excess in the decision-point stove burner hearth;
The actual air inflow of described ignition furnace:
FI
In=C(FI
Combustion 1+ FI
Combustion 2)+[FI
Empty 1+ FI
Empty 2-δ (FI
Combustion 1+ FI
Combustion 2)]
Wherein C is the exhaust gas volumn constant of combustion gas when fully burning;
Wherein δ is the air-fuel ratio coefficient of combustion gas when fully burning.
5. method according to claim 2, it is characterized in that, first gas flow and first air mass flow and second gas flow by pitot tube inlet point stove burner hearth and second air mass flow of described basis by igniting pipeline inlet point stove burner hearth calculated and specifically comprised:
The ratio of the air fuel gas flow in entering into the ignition furnace burner hearth is during less than the standard air-fuel ratio, and then combustion gas is superfluous in the decision-point stove burner hearth;
The actual air inflow of described ignition furnace:
Wherein C is the exhaust gas volumn constant of combustion gas when fully burning;
Wherein δ is the air-fuel ratio coefficient of combustion gas when fully burning.
6. method according to claim 1 and 2 is characterized in that, describedly determines that according to the actual air inflow of ignition furnace the bellows target flow also comprises the disturbance link, and described disturbance link is specially:
Obtain burner hearth target negative pressure according to ignition furnace work at present task;
Collection point stove burner hearth actual suction pressure;
Compare described burner hearth target negative pressure and described burner hearth actual suction pressure acquisition point combustion chamber draft deviation;
Calculate described combustion chamber draft deviation with adjust coefficient long-pendingly obtain the adjustment flow that disturbance causes;
Difference according to the actual air inflow of described ignition furnace and described adjustment flow is determined the bellows target flow.
7. a sintering ignition furnace flow control system is characterized in that, comprising:
Bellows target flow the first determining unit is used for determining the bellows target flow according to the actual air inflow of ignition furnace;
Bellows actual flow collecting unit is for the bellows actual flow that gathers bellows;
Bellows flow deviation computing unit is used for comparing described bellows target flow and described bellows actual flow obtains the bellows flow deviation;
Bellows valve opening adjustment unit is used for according to the corresponding aperture of adjusting the bellows valve of described bellows flow deviation.
8. system according to claim 7 is characterized in that, described bellows target flow the first determining unit also comprises actual air inflow computing unit:
Described actual air inflow computing unit is used for according to the first gas flow FI by igniting pipeline inlet point stove burner hearth
Combustion 1With the first air mass flow FI
Empty 1And the second gas flow FI that passes through pitot tube inlet point stove burner hearth
Combustion 2With the second air mass flow FI
Empty 2Calculate the actual air inflow of described ignition furnace.
9. according to claim 7 or 8 described systems, it is characterized in that, also comprise the disturbance unit:
Described disturbance unit specifically comprises:
Burner hearth target negative pressure determining unit is used for obtaining burner hearth target negative pressure according to ignition furnace work at present task;
Burner hearth actual suction pressure collecting unit is used for collection point stove burner hearth actual suction pressure;
Combustion chamber draft deviation computing unit is used for comparing described burner hearth target negative pressure and described burner hearth actual suction pressure acquisition point combustion chamber draft deviation;
Adjust the flow rate calculation unit, be used for calculating described combustion chamber draft deviation with adjust coefficient long-pendingly obtain the adjustment flow that disturbance causes;
Bellows target flow the second determining unit is used for determining the bellows target flow according to the difference of the actual air inflow of described ignition furnace and described adjustment flow.
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