CN101270880A - Air-fuel ratio control system of combustion heating furnace - Google Patents
Air-fuel ratio control system of combustion heating furnace Download PDFInfo
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- CN101270880A CN101270880A CNA2008100860515A CN200810086051A CN101270880A CN 101270880 A CN101270880 A CN 101270880A CN A2008100860515 A CNA2008100860515 A CN A2008100860515A CN 200810086051 A CN200810086051 A CN 200810086051A CN 101270880 A CN101270880 A CN 101270880A
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Abstract
The invention provides an air fuel ratio control system of a burning heating furnace capable of controlling burning widely from oxidation burning to restoring burning and of determining oxygen concentration simply lacking of operators with technical knowledge. The system includes a burner (2) arranged in the burning heating furnace, a fuel supply pipe (3) supplying fuel gas to the burner (2), an air supply pipe (4) supplying air for burn to the burner (2) and a temperature control computer (10). The temperature control computer (10) pre-remembers a first formula (burning air amount=fuel gas flow*theoretical air amount*air fuel ratio) and a second formula (air fuel ratio=20.6/20.6-oxygen concentration) and automatically controls burning air amount according to the gas flow based on the formula when inputting the oxygen concentration.
Description
Technical field
The present invention relates at various ceramic industry goods, ceramic heating, burn till etc. in the air-fuel ratio control system of employed combustion heating furnace, particularly can reduce the air-fuel ratio control system of the combustion heating furnace that burns till.
Background technology
Above-mentioned combustion heating furnace possesses a plurality of gas burners as heating source, is supplied in the gas flow and the air mass flow of gas burner, the temperature curve that obtains wanting by control.The running of such combustion heating furnace is controlled at the past and is undertaken by manual type, but owing to the increase of the goods of strict firing condition, wish reason such as unmanned running at night, in recent years, the automatic control of being undertaken by the temperature control computer is gradually general.In addition, burning till when needing goods that reduction burns till, A.T.C and air-fuel ratio (air-fuel ratio) make burner reduction burning.
System commonly used as the air-fuel ratio control system known in the past can exemplify out equalizing valve control system, (air/combustion gas) feedforward system, utilize these three kinds of the feedback control systems of oxymeter.
The equalizing valve control system as shown in Figure 1, it is for to be provided with the combustion gas equalizing valve on gas supply pipe, utilize the temperature control computer to make the system of combustion gas equalizing valve automatic shutter, makes that when opening and closing the air flow control valve it is equal with gas pressure that air is pressed.But this system can not reduce and burn till.
(air/combustion gas) feedforward system is to utilize the temperature control computer to control the system of air flow control valve and gas flow control valve simultaneously as shown in Figure 2, makes both aperture ratio programs, makes it reduce burning forcibly.But, because season, round the clock, the variation year in year out of furnace pressure, machine etc., make the discharge characteristic of air or combustion gas change, therefore,, just can not carry out high-precision control if do not carry out the machine adjustment continually.
The feedforward control system that utilizes oxymeter as shown in Figure 3, it is when utilizing the temperature control computer to open and close gas flow control valve, system by oxygen concentration control computer switching air flow control valve makes the oxygen concentration of being measured by the oxymeter that is provided with in the stove reach desired value.But, therefore lack practicality because the oxymeter correspondence is poor, fault is many.
No matter use which kind of system, in low-temperature region, gas quantity, air capacity are all lacked, the circulation gas quantity deficiency in the stove.Its result is, in low-temperature region, the heterogeneity that becomes easily of the Temperature Distribution in the stove also exists to make in goods and burns till quality and produce uneven problem.In addition, shown in patent documentation 1, also have by in combustion air, sneaking into the method that nitrogen carries out air-fuel ratio control, but owing to need source nitrogen and cost cost, therefore except the burning till of special ceramic, not too use the method.
Patent documentation 1: TOHKEMY 2003-214603 communique
Summary of the invention
In order to solve above-mentioned problem points in the past, main purpose of the present invention provides a kind of air-fuel ratio control system of combustion heating furnace, make the adjustment utilize air-fuel ratio to burn till to reduction and burn till the control of burning widely from oxidation, even and the operator of shortage technological know-how also can carry out the setting of oxygen concentration easily.In addition, even other purposes of the present invention provide and a kind ofly also can avoid the air-fuel ratio control system of the combustion heating furnace of the temperature distributing disproportionation one in the stove at low-temperature region.
Being used to solve the of the present invention of above-mentioned problem is characterized as, it comprises the burner that is arranged on combustion heating furnace, possess gas meter and gas flow control valve and supply with the gas supply pipe of fuel gas to burner, possess mass air flow sensor and air flow control valve and supply with air supply pipe and the temperature control computer of fuel with air to burner, this temperature control computer is remembered the 1st formula of (combustion air amount=gas flow * theoretical air requirement * air-fuel ratio) in advance, the 2nd formula of (air-fuel ratio=20.6/20.6-oxygen concentration), possess when input during oxygen concentration based on above-mentioned formula, control the function of combustion air amount automatically according to gas flow.
If possessing in order to supply with a large amount of air in low-temperature region, the temperature control computer carries out other control, after reaching set point of temperature,, control the function of combustion air amount automatically based on above-mentioned formula, even then in low-temperature region, also can avoid the heterogeneity of the Temperature Distribution in the stove.
The air-fuel ratio control system of combustion heating furnace of the present invention is when the oxygen concentration of wishing to the input of temperature control computer, according to this input, the temperature control computer is based on the 1st formula of (combustion air amount=gas flow * theoretical air requirement * air-fuel ratio), the 2nd formula of (air-fuel ratio=20.6/20.6-oxygen concentration), and corresponding gas flow is controlled the combustion air amount automatically.Therefore, even lack the operator of technological know-how, also can under the target oxygen concentration conditions, carry out the heating of goods and burn till.
In addition, shown in technical scheme 2, before reaching the temperature of regulation, if make up a large amount of air of the feasible supply of other control, even then also can guarantee circulation gas quantity in the stove, can prevent because caused the uneven of quality that burn till of heterogeneity of Temperature Distribution at low-temperature region.
Description of drawings
Fig. 1 is the key diagram of equalizing valve control system in the past.
Fig. 2 is the key diagram of (air/combustion gas) feedforward system in the past.
Fig. 3 is the key diagram of the feedback control system of utilizing oxymeter in the past.
Fig. 4 is the key diagram of expression embodiments of the present invention.
Fig. 5 is the variations in temperature when representing conceptually to turn round usually and the curve map of changes in flow rate.
Fig. 6 is the curve map of the variations in temperature and the changes in flow rate of the invention of presentation technology scheme 2 conceptually.
Symbol description
The body of heater of 1 combustion heating furnace
2 burners
3 gas supply pipes
4 air supply pipes
5 gas meters
6 gas flow control valves
7 mass air flow sensor
8 air flow control valves
9 temperature sensors
10 temperature control computers
11 temperature control parts
12 air-fuel ratio control parts
The specific embodiment
Below, embodiments of the present invention are described.
In Fig. 4, the 1st, in the heating of various ceramic industry goods, ceramic, burn till etc. in the body of heater of employed combustion heating furnace, the 2nd, the burner that in this body of heater 1, is provided with.In the figure, for an illustration has been described 1 burner 2, be self-evident but a plurality of burners 2 are set in the reality.Burner 2 is gas burners, the 3rd, and gas supply pipe, the 4th, air supply pipe.The body of heater 1 of present embodiment is a batch kiln, preferably shuttle kiln.
In gas supply pipe 3, gas meter 5 and gas flow control valve 6 are set, in air supply pipe 4, mass air flow sensor 7 and air flow control valve 8 are set.In addition, in the body of heater 1 temperature sensor 9 is set.
The 10th, the temperature control computer.This temperature control computer 10 possesses temperature control function and air-fuel ratio control function, in Fig. 4, represents with temperature control part 11 and air-fuel ratio control part 12.Temperature control part 11 is according to temperature curve temperature programmed in the stove is controlled, the interior temperature of the stove that input utilizes temperature sensor 9 to detect, control the gas quantity that is supplied in burner 2 by temperature control part 11 to gas flow control valve 6 output aperture signals, this mode be identical in the past.
On the other hand, air-fuel ratio control part 12 is the parts that become feature of the present invention.This air-fuel ratio control part 12 is being remembered the 1st formula of (combustion air amount=gas flow * theoretical air requirement * air-fuel ratio), the 2nd formula of (air-fuel ratio=20.6/20.6-oxygen concentration) as calculation formula in the computer.Certainly, also can remember (combustion air amount=gas flow * theoretical air requirement * (20.6/20.6-oxygen concentration)) with these two formula equivalences.20.6 be the value that airborne oxygen concentration is represented with %.
In the present invention, with target oxygen concentration input temp control computer 10.Adopting oxygen concentration is because often specify oxygen concentration as the firing condition of ceramic as input value.Calculate air-fuel ratio according to the 2nd formula, reach its air-fuel ratio according to the 1st formula, deciding and making the combustion air amount is several times of gas flow.Gas flow changes according to the instruction that temperature control part 11 sends, but utilize gas meter 5 to measure its actual flow with real-time mode, the air-fuel ratio control part 12 calculations combustion air amount corresponding with this gas flow come open and close controlling air flow control valve 8.In addition, actual combustion air amount can utilize mass air flow sensor 7 to confirm, carries out FEEDBACK CONTROL.
This result is, can be on one side according to temperature in the temperature curve control stove of programming, on one side the oxygen concentration in the stove is maintained the value of appointment.Like this, in the present invention, air-fuel ratio control part 12 opens and closes air flow control valve 8 corresponding to gas flow with real-time mode, therefore can control to reach from oxidation and burn till any atmosphere of burning till to reduction.And when reduction was burnt till, the oxygen concentration of input can be a negative value, if oxygen concentration is zero, then can burn till in neutral atmosphere.
As mentioned above, if adopt system of the present invention, just can automatically carry out burning till under the oxygen concentration condition of appointment according to the oxygen concentration of input.Therefore, even lack the mistake that the operator of technological know-how also can not produce furnace operating.
But, even adopt above-mentioned system of the present invention, in the low-temperature region that temperature is low in stove, as shown in Figure 5, air mass flow and gas flow are all lacked, thereby, because it is the combustion gas flow of burner 2 is few, then insufficient just inevitable by the mixing effect in the caused stove of burning gases.According to the kind of goods, the temperature history of low-temperature region has a significant impact burning till quality sometimes, for such goods, because the position being set may producing and burn till the uneven of quality in the stove.
Therefore, in the invention of technical scheme 2, after temperature reaches set point of temperature in the stove, carry out aforesaid air-fuel ratio control, in addition also give the function that temperature control computer 10 carries out other control, make a large amount of air of supply in low-temperature region.Particularly, as shown in Figure 6, gas flow is controlled according to the instruction that temperature control part 11 sends, but in the low-temperature region before reaching set point of temperature, gives the 8 different apertures instructions of air flow control valve and comes air to burner 2 excess supply amounts.
In this stage, be to stir necessary air mass flow in the stove in order to supply with, particularly, decide the air mass flow of necessity according to the size of body of heater 1.But, since temperature when rising gas flow increase, therefore necessary air mass flow little by little reduces as shown in Figure 6, reach the temperature of regulation after, switch to the control of described the present application.
Like this, if carry out other control at low-temperature region, though excess air can cause oxidizing fire,, can prevent because caused the uneven of quality that burn till of heterogeneity of Temperature Distribution even in low-temperature region, also can guarantee circulation gas quantity in the stove.
In the above-described embodiment, temperature control computer 10 describes as the equipment that only possesses temperature control function and air-fuel ratio control function, but in the reality, can make certainly also to possess other the equipment of control function such as furnace pressure.
Claims (2)
1. the air-fuel ratio control system of a combustion heating furnace, it is characterized in that, it comprises the burner that is arranged on combustion heating furnace, possess gas meter and gas flow control valve and to burner supply with fuel gas gas supply pipe, possess mass air flow sensor and air flow control valve and supply with air supply pipe and the temperature control computer of fuel with air to burner; This temperature control computer is remembered following the 1st formula and the 2nd formula in advance,
Combustion air amount=gas flow * theoretical air requirement * air-fuel ratio ... the 1st formula
Air-fuel ratio=20.6/ (20.6-oxygen concentration) ... the 2nd formula
And possess when input during oxygen concentration based on above-mentioned formula, corresponding gas flow is controlled the function of combustion air amount automatically.
2. the air-fuel ratio control system of combustion heating furnace according to claim 1, it is characterized in that, the temperature control computer possesses in order to supply with a large amount of air in low-temperature region and carries out other control, after reaching set point of temperature, based on above-mentioned formula, control the function of combustion air amount automatically.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007070552A JP2008232501A (en) | 2007-03-19 | 2007-03-19 | Air-fuel ratio control system for combustion heating furnace |
| JP2007-070552 | 2007-03-19 |
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| CN101270880A true CN101270880A (en) | 2008-09-24 |
| CN101270880B CN101270880B (en) | 2011-04-06 |
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| JP2008232501A (en) | 2008-10-02 |
| CN101270880B (en) | 2011-04-06 |
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