CN108800968A - A kind of hot rolling pulse heating furnace method for controlling combustion - Google Patents
A kind of hot rolling pulse heating furnace method for controlling combustion Download PDFInfo
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- CN108800968A CN108800968A CN201710292582.9A CN201710292582A CN108800968A CN 108800968 A CN108800968 A CN 108800968A CN 201710292582 A CN201710292582 A CN 201710292582A CN 108800968 A CN108800968 A CN 108800968A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0009—Monitoring the pressure in an enclosure or kiln zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D2021/0007—Monitoring the pressure
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- Regulation And Control Of Combustion (AREA)
Abstract
A kind of hot rolling pulse heating furnace method for controlling combustion of the present invention, suitable for low heating load, especially produce pulse-combustion when low target temperature and high hot charging temperature plate base, by on the basis of pulse-combustion, for low heating load, introduce low heat value Combustion System, calculate corresponding calorific value of gas under underload, and establish air-fuel ratio and space gas pipeline pressure needed for the pulse-combustion based on this, the calorific value of gas for calculating gained and space gas pipeline pressure are sent to calorific value of gas adjustment mechanism and heating furnace foundation Combustion System mechanism respectively, realize that pulse-combustion automatically controls, extend impulse burner burning time to reach, reduce burner valve switch number, improve the purpose of in-furnace temperature uniformity.
Description
Technical field
The invention belongs to smelting and heating Combustion System fields, and in particular to a kind of hot rolling pulse heating furnace Combustion System side
Method.
Background technology
Hot rolling pulse combustion technology is a kind of new heating combustion technology, compared with traditional hot-rolling heating furnace, most of heat
Pulse heating furnace is rolled other than soaking zone top uses the flat flame burner of bi -cross limitation control, other each control areas are adopted
With pulse controlled adjustable flame burner nozzle, such burner is also known as impulse burner, and arrangement is all on side wall.
Each impulse burner forms with air, coal gas system, is respectively mounted on the sky, gas piping before burner
ON/OFF automatic stop valves, all stop valves are provided with standard-sized sheet, fully closed limit switch.Under normal circumstances, burner hearth both sides burner
Pulse-combustion is realized in chain pairs of use, the burning instruction assigned by control system.Since impulse burner is typically in full
Determine to carry out switch control under power, the time only burnt sample different in size, once like impulse wave, therefore claims pulse-combustion.
Impulse burner determines burning time by controlling before burner the switch time of coal gas and air switching valve, then with firing
The length for burning the time reaches setting furnace temperature to accurately control practical furnace temperature.Impulse burner combination heating furnace actual heating load needs
The control for carrying out burning time is asked, to achieve the effect that ensure heating quality.This utilizes coal with traditional dual crossing control technology
Throughput continuously adjusts the difference for having essenceization into trip temperature control.Impulse burner only sets manifold coal gas using fuel
Pressure and without flow-rate adjustment, once so burner normal burst works, full load condition is at, when ensureing burner combustion
Gas outlet speed it is constant.When needing heating, the burner combustion time lengthens, and break time reduces；When needing cooling, burner
Burning time reduces, and break time lengthens.Air and gas valve before impulse burner determine valve according to thermal load demands
Opening time, there is certain period in burning time, and system can determine next period again according to thermal load demands after each period
The making time of interior burner.
For hot rolling pulse heating furnace when thermal load demands are smaller, the time of impulse burner burning is just shorter.But in length
Phase in use, the main problem of generation is as follows：
When thermal load demands are smaller, burner inevitably frequent switching switch, valve event be difficult to it is fully synchronized, from
And energy use efficiency is reduced, burning is not easy to stablize, meanwhile, also influence the stability of valve arrangement.
Since burning time is short, burning time is not long, and air valve is not closed completely close so that the air of air door leakage is more
It is more, cause furnace temperature uneven, problem seriously affects the using effect of hot rolling pulse heating furnace, directly affects the heating matter of slab
Amount.Traditional hot rolling pulse heating furnace wish calorific value stablize it is motionless, emphatically from equipment sealing on solve this production technology problem,
It is used however, it is difficult to stablize for a long time, neither one method can improve the problem by the flexible utilization of control system so far.
Article《Application of the fuzzy control technology in reheat furnace system》Describe by combustion gas flow analysis and
Control carrys out the technology of false impulse formula burner.Fuzzy control technology is mainly used, the controller parameter of pulse-combustion is calculated, it should
The gas-air flow of each burner in scene is added in each model and calculates by technology, makes calculated burner opening time
More level off to it is optimal, improve control accuracy.Although the technology optimizes pulse burning control technique algorithm, but be not related to hot rolling pulse
How heating furnace overcomes existing system insufficient when thermal load demands are smaller, especially by the Comprehensive Control of calorific value, extends
The problem of impulse burner burning time.
Application No. is：The patent application of CN93111718.6 discloses " coal gas mixed thermal value and pressure decoupling control system
System ", wherein poor transmitter, pressure regulator, first order inertial loop, multiplier, coke gas flow inner loop and gas fluid in blast furnace
Measure inner loop decomposition pressure main ring, measurement of caloric value device, adjustment heat value device, smith prediction devices, first order inertial loop, multiplier, coke
Producer gas flow inner loop and blast furnace gas flow inner loop form calorific value main ring, two main rings by by multiplier, constant give device,
The decoupling device of subtracter and two flow inner loop compositions forms two cascade control systems of dividing and ruling.The key of the control method is
There is provided in normal reheating furnace it is a kind of can calorific value and pressure effectively online while that control mixed gas, make it and certain proportion
Air match, the coal gas mixed thermal value and pressure solution lotus root control system of completely burned are reached in stove.The technology is although excellent
The relationship of fuel gases calorific value and pressure is changed, but unrelated with the work of impulse burner prolonging burning time under low heat loads.
Invention content
In order to solve the above problem, efficiency of combustion, the temperature uniformity of flame holding and heating of plate blank are improved, the present invention carries
Supply a kind of hot rolling pulse heating furnace method for controlling combustion, technical solution specific as follows：
A kind of hot rolling pulse heating furnace method for controlling combustion is suitable for low heating load, especially produces low target temperature
And pulse-combustion when high hot charging temperature plate base, it is characterised in that：On the basis of pulse-combustion, for low heating load, draw
Enter low heat value Combustion System, calculates corresponding calorific value of gas under underload, and establish the air-fuel needed for the pulse-combustion based on this
Than with space gas pipeline pressure, respectively will calculate gained calorific value of gas and space gas pipeline pressure be sent to calorific value of gas adjustment
Mechanism and heating furnace foundation Combustion System mechanism realize that pulse-combustion automatically controls, when extending impulse burner burning to reach
Between, reduce burner valve switch number, improve the purpose of in-furnace temperature uniformity, specifically include following step sequence：
S1：According to technological requirement, start low heat value Combustion System, and according to production low target temperature and high hot charging temperature plate
Calorific value of gas determines new calorific value of gas setting value needed for being calculated when base；
S2：According to the theoretical calculation model of air-fuel ratio, the new corresponding optimum air-fuel ratio of calorific value of gas setting value is determined；
S3：According to gas pressure window setting value, gas temperature measured value and reference value, the measured value of calorific value, reference value,
New calorific value of gas setting value determines that gas pressure controls setting value using gas pressure setup algorithm model；
S4：According to air pressure window setting value, gas pressure control setting value, gas pressure reference value, air themperature
Measured value and reference value, air-fuel ratio calculate model using air pressure, determine air-pressure controlling setting value；
S5：The calorific value of gas for calculating gained and space gas pipeline pressure are sent to calorific value of gas adjustment mechanism and heating furnace
Basic Combustion System mechanism realizes that pulse-combustion automatically controls.
A kind of hot rolling pulse heating furnace method for controlling combustion according to the present invention, it is characterised in that：
New calorific value of gas setting value described in step S1 is determined especially by following：
Z '=(Qn×Z×τ-ΔQheat)/(Qn×τ)
z′：New fuel gases calorific value, unit：J/m3；
Qn：The total metered flow of burner；Unit：m3/s；
Z：Former fuel gases calorific value；Unit：J/m3；
τ：Burner run time；Unit：s；
ΔQheat：Produce the heat of low target temperature or Infrared measurement technique for hot-slabs reduction；Unit：J；
Wherein：ΔQheatIt is determined according to following：
n：Slab quantity in stove；
Slab average weight；Unit：kg；
Cpslab：Slab specific heat；Unit：J/(kg·℃)；
ρair：Furnace gas density；Unit：kg/m3；
Vair：Furnace gas volume.Unit：m3；
Cpair：Furnace gas specific heat；Unit：J/(kg·℃)；
Δ t-target temperature or dress base temperature difference；Unit：℃.
A kind of hot rolling pulse heating furnace method for controlling combustion according to the present invention, it is characterised in that：
Optimum air-fuel ratio described in step S2 is determined according to following：
L0：Air-fuel ratio；
m,n：CmHnAtomicity in gas；
CO%, H2%, CH4%, CmHn%, H2S%, O2%：Each mixed gas percentage.
A kind of hot rolling pulse heating furnace method for controlling combustion according to the present invention, it is characterised in that：
Gas pressure described in step S3 controls setting value, is determined according to following：
Wherein,
PCoal gas control setting：Gas pressure controls setting value, unit：Pa；
PCoal gas window is arranged：Gas pressure window setting value, unit：Pa；
TCoal gas is practical：The practical temperature for measuring mixed gas, unit：℃；
TCoal gas refers to：Mixed gas nominal reference temperature, unit：℃；
ZWith reference to：Mixed gas nominal reference calorific value, unit：J/m3；
ZIt is practical：Mixed gas actual calorific value, unit：J/m3；
ZNew calorific value：The new calorific value setting value of gas station setting, J/m3；
ZFormer calorific value：Rough gas station sets calorific value, J/m3；
A kind of hot rolling pulse heating furnace method for controlling combustion according to the present invention, it is characterised in that：
Air-pressure controlling setting value described in step S4 is determined according to following：
PAir control setting：Air-pressure controlling setting value, unit：Pa；
PAir window is set：Combustion air pressure window setting value, unit：Pa；
PCoal gas control setting：Gas pressure controls setting value, unit：Pa；
PCoal gas refers to：Coal gas main pipe pressure reference value；Unit：Pa；
TAir is practical：It is practical to measure air themperature, unit：℃；
TAir reference：Air nominal reference temperature, unit：℃；
LNew air-fuel ratio：Based on the air-fuel ratio under new calorific value setting value；
LFormer air-fuel ratio：Air-fuel ratio under former calorific value；
λ：Comprehensive correction factor (it is adjustable, it is initially set 1).
A kind of hot rolling pulse heating furnace method for controlling combustion of the present invention is suitable for low heating load, especially produces low
Pulse-combustion when target temperature and high hot charging temperature plate base, by the basis of pulse-combustion, for low heating load, drawing
Enter low heat value Combustion System, calculates corresponding calorific value of gas under underload, and establish the air-fuel needed for the pulse-combustion based on this
Than with space gas pipeline pressure, respectively will calculate gained calorific value of gas and space gas pipeline pressure be sent to calorific value of gas adjustment
Mechanism and heating furnace foundation Combustion System mechanism realize that pulse-combustion automatically controls, when extending impulse burner burning to reach
Between, reduce burner valve switch number, improve in-furnace temperature uniformity purpose.
Description of the drawings
Fig. 1 is that the control of the present invention walks program flow diagram.
Specific implementation mode
In the following, according to specification drawings and specific embodiments to a kind of hot rolling pulse heating furnace Combustion System of the present invention
Method is further described in detail.
A kind of hot rolling pulse heating furnace method for controlling combustion as shown in Figure 1 is suitable for low heating load, especially produces
Pulse-combustion when low target temperature and high hot charging temperature plate base, by the basis of pulse-combustion, for low heating load,
Low heat value Combustion System is introduced, calculates corresponding calorific value of gas under underload, and establish the sky needed for the pulse-combustion based on this
Combustion ratio and space gas pipeline pressure will calculate the calorific value of gas of gained respectively and space gas pipeline pressure are sent to calorific value of gas tune
Complete machine structure and heating furnace foundation Combustion System mechanism realize that pulse-combustion automatically controls, and extend impulse burner burning to reach
Time reduces burner valve switch number, improves the purpose of in-furnace temperature uniformity.
Specifically include following step sequence：
S1：According to technological requirement, start low heat value Combustion System, and according to production low target temperature and high hot charging temperature plate
Calorific value of gas determines new calorific value of gas setting value needed for being calculated when base；
S2：According to the theoretical calculation model of air-fuel ratio, the new corresponding optimum air-fuel ratio of calorific value of gas setting value is determined；
S3：According to gas pressure window setting value, gas temperature measured value and reference value, the measured value of calorific value, reference value,
New calorific value of gas setting value determines that gas pressure controls setting value using gas pressure setup algorithm model；
S4：According to air pressure window setting value, gas pressure control setting value, gas pressure reference value, air themperature
Measured value and reference value, air-fuel ratio calculate model using air pressure, determine air-pressure controlling setting value；
S5：The calorific value of gas for calculating gained and space gas pipeline pressure are sent to calorific value of gas adjustment mechanism and heating furnace
Basic Combustion System mechanism realizes that pulse-combustion automatically controls.
Wherein,
New calorific value of gas setting value described in step S1 is determined especially by following：
Z '=(Qn×Z×τ-ΔQheat)/(Qn×τ)
z′：New fuel gases calorific value, unit：J/m3；
Qn：The total metered flow of burner；Unit：m3/s；
Z：Former fuel gases calorific value；Unit：J/m3；
τ：Burner run time；Unit：s；
ΔQheat：Produce the heat of low target temperature or Infrared measurement technique for hot-slabs reduction；Unit：J；
Wherein：ΔQheatIt is determined according to following：
n：Slab quantity in stove；
Slab average weight；Unit：kg；
Cpslab：Slab specific heat；Unit：J/(kg·℃)；
ρair：Furnace gas density；Unit：kg/m3；
Vair：Furnace gas volume.Unit：m3；
Cpair：Furnace gas specific heat；Unit：J/(kg·℃)；
Δ t-target temperature or dress base temperature difference；Unit：℃.
Wherein,
Optimum air-fuel ratio described in step S2 is determined according to following：
L0：Air-fuel ratio；
m,n：CmHnAtomicity in gas；
CO%, H2%, CH4%, CmHn%, H2S%, O2%：Each mixed gas percentage.
Wherein,
Gas pressure described in step S3 controls setting value, is determined according to following：
Wherein,
PCoal gas control setting：Gas pressure controls setting value, unit：Pa；
PCoal gas window is arranged：Gas pressure window setting value, unit：Pa；
TCoal gas is practical：The practical temperature for measuring mixed gas, unit：℃；
TCoal gas refers to：Mixed gas nominal reference temperature, unit：℃；
ZWith reference to：Mixed gas nominal reference calorific value, unit：J/m3；
ZIt is practical：Mixed gas actual calorific value, unit：J/m3；
ZNew calorific value：The new calorific value setting value of gas station setting, J/m3；
ZFormer calorific value：Rough gas station sets calorific value, J/m3；
Wherein,
Air-pressure controlling setting value described in step S4 is determined according to following：
PAir control setting：Air-pressure controlling setting value, unit：Pa；
PAir window is set：Combustion air pressure window setting value, unit：Pa；
PCoal gas control setting：Gas pressure controls setting value, unit：Pa；
PCoal gas refers to：Coal gas main pipe pressure reference value；Unit：Pa；
TAir is practical：It is practical to measure air themperature, unit：℃；
TAir reference：Air nominal reference temperature, unit：℃；
LNew air-fuel ratio：Based on the air-fuel ratio under new calorific value setting value；
LFormer air-fuel ratio：Air-fuel ratio under former calorific value；
λ：Comprehensive correction factor (it is adjustable, it is initially set 1).
Principle is sketched：
Step 1：On the picture of control system, provide conventional calorific value and low heat value two kinds of Combustion Systems that can be selected
Mode, wherein conventional calorific value is the acquiescence calorific value used when pulse heating furnace production；Low heat value be production low target temperature and
The required calorific value calculated when high hot charging temperature plate base.
The specific of low heat value setting value determines that method is as follows：
Z '=(Qn×Z×τ-ΔQheat)/(Qn×τ)
The new fuel gases calorific values of z '-, unit：J/m3；
QnThe total metered flow of-burner, unit：m3/s；
Z-original fuel gases calorific value, unit：J/m3；
τ-burner run time, unit：s；
ΔQheat- production low target temperature or the heat of Infrared measurement technique for hot-slabs reduction, unit：J.
Wherein：ΔQheatDetermine that method is as follows：
Slab quantity in n-stove；
- slab average weight, unit：kg；
Cpslab- slab specific heat, unit：J/(kg·℃)；
ρair- furnace gas density, unit：kg/m3；
Vair- furnace gas volume, unit：m3；
Cpair- furnace gas specific heat, unit：J/(kg·℃)；
Δ t-target temperature or dress base temperature difference, unit：℃.
Step 2：From gas station computer, the proportioning and mixed gas molecule component of mixed gas are obtained, according to air-fuel ratio
Theoretical calculation model, calculate the air-fuel ratio under the present situation；Specific method is：
L0- air-fuel ratio；
m,n—CmHnAtomicity in gas；
CO%, H2%, CH4%, CmHn%, H2S%, O2% --- each mixed gas percentage.
Step 3：According to gas pressure window setting value, gas temperature measured value and reference value, the measured value of calorific value, ginseng
Value, new calorific value setting value are examined, using gas pressure setup algorithm model, gas pressure control setting value is calculated, by heating furnace
Basic Combustion System mechanism realizes automatically controlling for gas pressure；
The gas pressure being directed to calculates model, determines that method is as follows：
Wherein, PCoal gas control setting- coal gas control setting the pressure obtained by model calculation, unit：Pa；
PCoal gas window is arranged- coal gas setting the pressure being manually entered by L2 pictures, unit：Pa；
TCoal gas is practical- reality measures the temperature of mixed gas, unit：℃；
TCoal gas refers to- mixed gas nominal reference temperature, unit：℃；
ZWith reference to- mixed gas nominal reference calorific value, unit：J/m3；
ZIt is practical- mixed gas actual calorific value, unit：J/m3；
ZNew calorific valueThe low heat value of-new calculating gas station setting, unit：J/m3；
ZFormer calorific value- rough gas station sets calorific value, unit：J/m3。
Step 4：According to air pressure window setting value, gas pressure control setting value, gas pressure reference value, air
Temperature measured value and reference value, air-fuel ratio calculate model using air pressure, air-pressure controlling setting value are calculated, by adding
Hot stove basis Combustion System mechanism realizes automatically controlling for air pressure；
The combustion air calculation of pressure model being related to is as follows：
PAir control setting- combustion air control setting the pressure obtained by model calculation, unit：Pa；
PAir window is set- combustion air setting the pressure being manually entered by L2 pictures, unit：Pa
PCoal gas control setting--- gas pressure controls setting value, unit：Pa；
PCoal gas refers to- coal gas main pipe pressure reference value；
TAir is practical- reality measures air themperature, unit：℃；
TAir reference- air nominal reference temperature, unit：℃；
LNew air-fuel ratioAir-fuel ratio under the-low heat value newly calculated；
LFormer air-fuel ratioAir-fuel ratio under-original calorific value；
λ-comprehensive correction factor (it is adjustable, it is initially set 1).
The above method gets up gas station calorific value control and the collaboration of hot rolling pulse heating furnace Combustion System, first, according to heat
It rolls and produces different heat demands, different calorific value setting values can be chosen；Air-fuel ratio model leads to according to the component of mixed gas
It crosses operation and obtains optimal air-fuel ratio；Then, the pressure set points of mixed gas and combustion air are obtained by pressure model operation,
Realize that coal gas, air pressure automatically control by heating furnace foundation Combustion System mechanism.This method makes hot rolling pulse heating furnace
In the case of normal thermic load and low heat loads, can efficient burning, solve burner combustion time mistake under low heat loads
Burner switch caused by short is frequent, burning is insufficient, valve switch is easy not in place, air door and easily leaks air, flame not
The stable and non-uniform problem of furnace gas temperature, improves efficiency of combustion and the temperature uniformity of bar plate heating stove.
Embodiment：
It elaborates below to the embodiment of the present invention, the present embodiment carries out reality based on the technical solution of the present invention
It applies, gives detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following embodiments.
By taking certain hot rolling producing line as an example, the control method determines producing line pulse heating furnace in production hot charging through the invention
When the slab of low target temperature, new fuel value is set, is determined by using gas pressure formula and air pressure formula mixed
Close gas pressure setting value and combustion air pressure set points.
Pulse heating furnace determines new fuel gases calorific value and coal gas, air pressure when producing hot charging low target temperature slab
The step of control method of power formula, is as follows：
1. on the picture of control system, provide conventional calorific value and low heat value two kinds of combustion control modes that can be selected,
Wherein conventional calorific value is the acquiescence calorific value used when pulse heating furnace design；Low heat value is in production low target temperature and high hot charging
When temperature slab, the required calorific value that calculates.
The specific of low heat value determines that method is as follows：
ΔQheat--- production low target temperature or the heat J of Infrared measurement technique for hot-slabs reduction；
Slab quantity in n=30 stoves；
Slab average weight；
Cpslab=750J/ (kg DEG C) slab specific heat；
ρair=1.3kg/m3Furnace gas density；
Vair=1536m3Furnace gas volume；
Cpair=1030J/ (kg DEG C) furnace gas specific heat；
T=300 DEG C of target temperature of Δ or dress base temperature difference；
It is computed：ΔQheat=1.356 × 1011J
New calorific value preset value calculation is as follows：
Z '=(Qn×Z×τ-ΔQheat)/(Qn×τ)
The new fuel gases calorific value J/m of z '-3；
Qn=11.44：The total metered flow of burner, unit：m3/s；
V=8.8 × 106Former fuel gases calorific value, unit：J/m3；
The burner run times of τ=12600, unit：s.
It is computed：Z '=7.86 × 106J/m3。
2. from gas station computer, the proportioning and mixed gas molecule component of mixed gas are obtained, according to the reason of air-fuel ratio
By computation model, the air-fuel ratio under the present situation is calculated；Specific method is：
According to new mixed gas proportioning and the fixed gas molecule component of three kinds of furnace gases, mixed gas molecular group is determined
Part, and then determine air-fuel ratio：
L0- air-fuel ratio；
m,n—CmHnIn atomicity；
CO%, H2%, CH4%, CmHn%, H2S%, O2% --- each mixed gas percentage；
In the mixed gas of former calorific value, CO accounts for 31.94%, H2Account for 17.48%, CH48.1% is accounted for, other fuel gas are
0.Then air-fuel ratio is LFormer air-fuel ratio=1.947。
In the mixed gas of new calorific value, CO accounts for 33.92%, H2Account for 13.22%, CH45.94% is accounted for, other fuel gas
It is 0.Then new air-fuel ratio is LNew air-fuel ratio=1.687.
3. according to gas pressure window setting value, gas temperature measured value and reference value, the measured value of calorific value, reference value,
New calorific value setting value is calculated gas pressure control setting value, is fired by heating furnace foundation using gas pressure setup algorithm model
It burns control mechanism and realizes automatically controlling for gas pressure；
It is as follows that the gas pressure being related to calculates model：
Wherein, PCoal gas control setting- coal gas control setting the pressure obtained by model calculation, Pa；
PCoal gas window is arranged- 7500Pa sets pressure by the coal gas that L2 pictures are manually entered；
TCoal gas is practical- 31 DEG C of practical temperature for measuring mixed gas；
TCoal gas refers to- 20 DEG C of mixed gas nominal reference temperature；
ZWith reference to—8.36×106J/m3Mixed gas nominal reference calorific value；
ZIt is practical- mixed gas actual calorific value, 7.86 × 106J/m3Left and right fluctuation；
ZNew calorific value—7.86×106J/m3It is new to calculate gas station low heat value；
ZFormer calorific value—8.8×106J/m3Rough gas station calorific value；
It is computed, PCoal gas control setting=7023Pa.
4. real according to air pressure window setting value, gas pressure control setting value, gas pressure reference value, air themperature
Measured value and reference value, air-fuel ratio calculate model using air pressure, air-pressure controlling setting value are calculated, by heating furnace foundation
Plinth Combustion System mechanism realizes automatically controlling for air pressure；
The combustion air calculation of pressure model being related to is as follows：
PAir control setting- combustion air control setting the pressure obtained by model calculation, unit：Pa；
PAir window is set- 8500Pa sets pressure by the combustion air that L2 pictures are manually entered；
PCoal gas control settingThe coal gas control setting pressure that -7020Pa is obtained by model calculation, Pa；
PCoal gas refers to- 5500Pa coal gas main pipe pressure reference values；
TAir is practical- 360 DEG C of practical measurement air themperatures；
TAir reference- 550 DEG C of air nominal reference temperature；
LNew air-fuel ratioAir-fuel ratio under -1.687 new calculating low heat values；
LFormer air-fuel ratioAir-fuel ratio under -1.947 former calorific values；
λ-comprehensive correction factor (it is adjustable, it is initially set 1)；
It is computed, PAir control setting=6267Pa.
Implementation result：
Heating furnace production complete two batches target temperature is low and the production of slab that steel loading temperature is high.One batch is adopted
With conventional calorific value and empty coal compress control method, another batch has used the method that the embodiment of the present invention provides.Slab
Tapping temperature uniformity is significantly increased.
Conventional calorific value controls production batch with conventional empty coal pressure：
51 pieces of slab is produced altogether, and slab charging temperature is more than 500 DEG C, and target temperature is more slightly lower than other slabs, gas station heat
Value is 8.8 × 106J/m3.Slab come out of the stove average surface temperature it is very poor be 22.7 DEG C, the very poor qualified slab for being less than 20 DEG C of temperature has
18 pieces, account for 35%.
New calorific value controls production batch with new empty coal pressure：
66 pieces of slab is produced altogether, and slab charging temperature is more than 500 DEG C, and target temperature is more slightly lower than other slabs, gas station heat
Value is 7.86 × 106J/m3.Slab come out of the stove average surface temperature it is very poor be 18.06 DEG C, the very poor qualified slab for being less than 20 DEG C of temperature
There are 50 pieces, accounts for 75%.Temperature uniformity qualification rate significantly improves.
A kind of hot rolling pulse heating furnace method for controlling combustion of the present invention is suitable for low heating load, especially produces low
Pulse-combustion when target temperature and high hot charging temperature plate base, it is characterised in that：On the basis of pulse-combustion, for low heating
Load introduces low heat value Combustion System, calculates corresponding calorific value of gas under underload, and establish needed for the pulse-combustion based on this
Air-fuel ratio and space gas pipeline pressure, respectively will calculate gained calorific value of gas and space gas pipeline pressure be sent to coal gas heat
It is worth adjustment mechanism and heating furnace foundation Combustion System mechanism, realizes that pulse-combustion automatically controls, to reach extension impulse burner
Burning time reduces burner valve switch number, improves the purpose of in-furnace temperature uniformity.
Claims (5)
1. a kind of hot rolling pulse heating furnace method for controlling combustion, be suitable for low heating load, especially produce low target temperature and
Pulse-combustion when high hot charging temperature plate base, it is characterised in that：On the basis of pulse-combustion, for low heating load, introduce
Low heat value Combustion System calculates corresponding calorific value of gas under underload, and establishes the air-fuel ratio needed for the pulse-combustion based on this
With space gas pipeline pressure, the calorific value of gas for calculating gained and space gas pipeline pressure are sent to calorific value of gas respectively and adjust machine
Structure and heating furnace foundation Combustion System mechanism, realize pulse-combustion automatically control, to reach extend impulse burner burning time,
Burner valve switch number is reduced, the purpose of in-furnace temperature uniformity is improved, specifically includes following step sequence：
S1：According to technological requirement, start low heat value Combustion System, and when according to production low target temperature and high hot charging temperature plate base
Calorific value of gas determines new calorific value of gas setting value needed for calculating；
S2：According to the theoretical calculation model of air-fuel ratio, the new corresponding optimum air-fuel ratio of calorific value of gas setting value is determined；
S3：According to gas pressure window setting value, gas temperature measured value and reference value, the measured value of calorific value, reference value, new
Calorific value of gas setting value determines that gas pressure controls setting value using gas pressure setup algorithm model；
S4：According to air pressure window setting value, gas pressure control setting value, gas pressure reference value, air themperature actual measurement
Value and reference value, air-fuel ratio calculate model using air pressure, determine air-pressure controlling setting value；
S5：The calorific value of gas for calculating gained and space gas pipeline pressure are sent to calorific value of gas adjustment mechanism and heating furnace foundation
Combustion System mechanism realizes that pulse-combustion automatically controls.
2. a kind of hot rolling pulse heating furnace method for controlling combustion according to claim 1, it is characterised in that：
New calorific value of gas setting value described in step S1 is determined especially by following：
Z '=(Qn×Z×τ-△Qheat)/(Qn×τ)
z′：New fuel gases calorific value, unit：J/m3；
Qn：The total metered flow of burner；Unit：m3/s；
Z：Former fuel gases calorific value；Unit：J/m3；
τ：Burner run time；Unit：s；
ΔQheat：Produce the heat of low target temperature or Infrared measurement technique for hot-slabs reduction；Unit：J；
Wherein：ΔQheatIt is determined according to following：
n：Slab quantity in stove；
Slab average weight；Unit：kg；
Cpslab：Slab specific heat；Unit：J/(kg·℃)；
ρair：Furnace gas density；Unit：kg/m3；
Vair：Furnace gas volume.Unit：m3；
Cpair：Furnace gas specific heat；Unit：J/(kg·℃)；
Δt:Target temperature or dress base temperature difference；Unit：℃.
3. a kind of hot rolling pulse heating furnace method for controlling combustion according to claim 1, it is characterised in that：
Optimum air-fuel ratio described in step S2 is determined according to following：
L0：Air-fuel ratio；
m,n：CmHnAtomicity in gas；
CO%, H2%, CH4%, CmHn%, H2S%, O2%：Each mixed gas percentage.
4. a kind of hot rolling pulse heating furnace method for controlling combustion according to claim 1, it is characterised in that：
Gas pressure described in step S3 controls setting value, is determined according to following：
Wherein,
PCoal gas control setting：Gas pressure controls setting value, unit：Pa；
PCoal gas window is arranged：Gas pressure window setting value, unit：Pa；
TCoal gas is practical：The practical temperature for measuring mixed gas, unit：℃；
TCoal gas refers to：Mixed gas nominal reference temperature, unit：℃；
ZWith reference to：Mixed gas nominal reference calorific value, unit：J/m3；
ZIt is practical：Mixed gas actual calorific value, unit：J/m3；
ZNew calorific value：The new calorific value setting value of gas station setting, J/m3；
ZFormer calorific value：Rough gas station sets calorific value, J/m3。
5. a kind of hot rolling pulse heating furnace method for controlling combustion according to claim 1, it is characterised in that：Institute in step S4
The air-pressure controlling setting value stated is determined according to following：
PAir control setting：Air-pressure controlling setting value, unit：Pa；
PAir window is set：Combustion air pressure window setting value, unit：Pa；
PCoal gas control setting：Gas pressure controls setting value, unit：Pa；
PCoal gas refers to：Coal gas main pipe pressure reference value；Unit：Pa；
TAir is practical：It is practical to measure air themperature, unit：℃；
TAir reference：Air nominal reference temperature, unit：℃；
LNew air-fuel ratio：Based on the air-fuel ratio under new calorific value setting value；
LFormer air-fuel ratio：Air-fuel ratio under former calorific value；
λ：Comprehensive correction factor (it is adjustable, it is initially set 1).
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Application publication date: 20181113 |