CN109579044A - Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace - Google Patents
Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace Download PDFInfo
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- CN109579044A CN109579044A CN201811329303.2A CN201811329303A CN109579044A CN 109579044 A CN109579044 A CN 109579044A CN 201811329303 A CN201811329303 A CN 201811329303A CN 109579044 A CN109579044 A CN 109579044A
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- air
- fuel ratio
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- calorific value
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- 239000000446 fuel Substances 0.000 title claims abstract description 50
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003034 coal gas Substances 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000013461 design Methods 0.000 claims description 8
- 238000011897 real-time detection Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 40
- 238000010438 heat treatment Methods 0.000 description 5
- 238000012937 correction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/34—Signal processing; Details thereof with feedforward processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/04—Gaseous fuels
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention relates to a dynamic feedforward combustion control method for the air-fuel ratio of a walking beam furnace, in the combustion control, in a combustion control system, a temperature controller adjusts the air and gas flow by a double-cross amplitude limiting controller and the air-fuel ratio setting through the comparison of the set temperature and the detected temperature and calculation processing, the gas heat value is detected in real time by an on-site gas heat value instrument, the air-fuel ratio is dynamically calculated, the calculated air-fuel ratio replaces the set air-fuel ratio, and the air and gas flow is readjusted before the air and the gas are combusted, so that the feedforward adjustment is realized. The advantages are that: the air-fuel ratio coefficient and the air excess coefficient of each section are automatically controlled. And adding the gas heat value parameter into the primary combustion model, so that the air-fuel ratio parameter is dynamically adjusted according to the actual value of the gas heat value, and the most effective utilization of the gas is ensured. The air-fuel ratio is always in a reasonable combustion state, and finally, the energy consumption is reduced, and the unit consumption of coal gas is reduced.
Description
Technical field
The invention belongs to air-fuel ratio control field more particularly to a kind of burning controls of walking beam furnace air-fuel ratio dynamic Feedforward
Method processed.
Background technique
The coal gas that hot-rolling heating furnace process uses be coke oven, blast furnace, converter mixed gas, three kinds of coal gas be all from ironmaking and
Steel-making, due to the difference of each moon production and management mode, every month three kinds of coal gas generation ratio and the method for salary distribution all have differences,
Exist which results in the calorific value of mixed gas in a certain range and fluctuates.The fluctuation of calorific value of gas heats producer gas list for control
Consume it is totally unfavorable because the coal gas of different calorific value needs to consume corresponding air capacity and the utilization rate of mixed gas can be made to reach
Highest.If air capacity, which crosses major general, imperfect combustion occurs, unburned coal gas will leave burner hearth and enter flue, cause the energy
It wastes and easily flue and its internal unit is damaged；If air excess, excess air will take away heat in burner hearth, drop
Low combustion temperature, and oxidizing atmosphere is formed in furnace, increase scaling loss.
It must take into account the fluctuation problem of calorific value of gas during burning control in heating furnace based on problem above.But it is practical
In operation, in the case where calorific value of gas frequent fluctuation, operator is difficult to complete anticipation and adjustment in time, and which results in skies
Combustion has eventually led to energy-output ratio rising than being in a kind of state of imbalance always, and gas unit consumption index rises.
Summary of the invention
In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a kind of walking beam furnace air-fuel ratio dynamic Feedforwards
Method for controlling combustion changes automatic adjustment air-fuel ratio, the combustion efficiency being optimal according to calorific value of gas.
To achieve the above object, the invention is realized by the following technical scheme:
A kind of walking beam furnace air-fuel ratio dynamic Feedforward method for controlling combustion, in combustion control system, temperature controller
It is adjusted by calculation processing by bi -cross limitation control device and air-fuel ratio set by the comparison of set temperature and detection temperature
Air and gas flow are saved, by live gas calorific value apparatus real-time detection calorific value of gas, thus dynamic theoretical air-fuel ratio calculates
Air-fuel ratio replaces the air-fuel ratio of setting, and air and gas flow are readjusted before air and gas-fired, carries out feedforward and adjusts
Section；
According to the method for live gas calorific value apparatus real-time detection calorific value of gas theoretical air-fuel ratio:
In formula (1): L is air-fuel ratio, and air capacity is set according to the actual amount of L value and coal gas；
α is calorific value control weight coefficient, value 0~1；
KIt surveysIt is the calorific value of gas surveyed by gas calorific value apparatus；
Δ I is each section of coefficient of excess air, value range 0.9~1.5；
K0Theoretical calorific value of gas when being furnace design；
LnTheoretical air-fuel ratio when being furnace design.
Compared with prior art, the beneficial effects of the present invention are:
The present invention improves existing Combustion System model, and air-fuel ratio coefficient and each section of coefficient of excess air is added certainly
Dynamic control.Calorific value of gas parameter is added in single-stage combustion model, keeps air-fuel ratio parameter dynamic according to the actual value of calorific value of gas
State adjustment, guarantees the most effective utilization of coal gas.In automatic mode, air-fuel ratio is in a kind of reasonable combustion state always, and most
Eventually reduce energy-output ratio, reduce gas unit consumption, and reduce as burn it is insufficient caused by atmosphere pollution.
Detailed description of the invention
Fig. 1 is control flow chart of the invention.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings of the specification, it should be noted that implementation of the invention is unlimited
In the following embodiments and the accompanying drawings.
See Fig. 1, a kind of walking beam furnace air-fuel ratio dynamic Feedforward method for controlling combustion, in combustion control system, temperature
Controller is set by calculation processing by bi -cross limitation control device and air-fuel ratio by the comparison of set temperature and detection temperature
It is fixed to adjust air and gas flow, by live gas calorific value apparatus real-time detection calorific value of gas, dynamic theoretical air-fuel ratio, thus
The air-fuel ratio of calculating replaces the air-fuel ratio of setting, and air and gas flow are readjusted before air and gas-fired, carries out
Feed-forward regulation；
According to the method for live gas calorific value apparatus real-time detection calorific value of gas theoretical air-fuel ratio:
In formula (1): L is air-fuel ratio, and air capacity is set according to the actual amount of L value and coal gas；
α is calorific value control weight coefficient, value 0~1；
KIt surveysIt is the calorific value of gas surveyed by gas calorific value apparatus；
Δ I is each section of coefficient of excess air, value range 0.9~1.5；
K0Theoretical calorific value of gas when being furnace design；
LnTheoretical air-fuel ratio when being furnace design.
Embodiment
Walking beam furnace air-fuel ratio dynamic Feedforward method for controlling combustion is based on the burning control of parallel cascade bicrossing limitation
System, except that its air-fuel ratio measures be modified in time at any time；This is a kind of feedforward control, when fuel gases calorific value occurs
When variation, just changes air-fuel ratio in time before not impacting to burning and compensate, therefore such burning could really
Accomplish Reasonable Combustion.By live caloric value instrument real-time monitoring value, participate in calculating as parameter after calculating by formula.
In the system, fuel gases calorific value measurement and air-fuel ratio correction operation link are increased.According to hot-restriking die size, by
Experience or operation can find air-fuel ratio correction value.Because amendment operation occurs before Actual combustion, so can compensate in time.
In formula (1): L is air-fuel ratio, and air capacity is set according to the actual amount of L value and coal gas；
Δ I is each section of coefficient of excess air, soaking zone, two bringing-up section values 1.05, a bringing-up section value 1.02；
α is calorific value control weight coefficient, value 0.65~0.75；
KIt surveysIt is the calorific value of gas surveyed by gas calorific value apparatus；
K0Theoretical calorific value of gas when being furnace design；Implementation heating furnace is 2000kcal
LnTheoretical air-fuel ratio when being furnace design, implementation heating furnace are limited to 1.6453~2.0524.
See Fig. 1, when work, temperature controller is by set temperature and detects the comparison of temperature, by calculation processing, by double
Cross limiting range controller and air-fuel ratio set adjust air and gas flow.Bi -cross limitation control is adjusted with fire box temperature
Circuit is main ring, and gas flow and both air flow modulation are inner loop, composed cascade bi -cross limitation control system.It passes through limitation
The variation range of coal gas and air mass flow under transition state is reduced between coal gas control loop and air control loop because lag is
Adverse effect caused by number difference, has good control precision.
The present invention uses gas calorific value apparatus, measures to the calorific value of gas of heating furnace gas main.Calorific value of gas is joined
Number is added in single-stage combustion model, is adjusted air-fuel ratio parameter according to the actual value dynamic of calorific value of gas, is guaranteed that coal gas most has
Effect utilizes.
Claims (1)
1. a kind of walking beam furnace air-fuel ratio dynamic Feedforward method for controlling combustion, which is characterized in that in combustion control system, temperature
Controller is spent by the comparison of set temperature and detection temperature, by calculation processing, by bi -cross limitation control device and air-fuel ratio
Setting is to adjust air and gas flow, by live gas calorific value apparatus real-time detection calorific value of gas, dynamic theoretical air-fuel ratio, by
This air-fuel ratio calculated replaces the air-fuel ratio of setting, and air and gas flow are readjusted before air and gas-fired, real
Row feed-forward regulation；
According to the method for live gas calorific value apparatus real-time detection calorific value of gas theoretical air-fuel ratio:
In formula (1): L is air-fuel ratio, and air capacity is set according to the actual amount of L value and coal gas；
α is calorific value control weight coefficient, value 0~1；
KIt surveysIt is the calorific value of gas surveyed by gas calorific value apparatus；
Δ I is each section of coefficient of excess air, value range 0.9~1.5；
K0Theoretical calorific value of gas when being furnace design；
LnTheoretical air-fuel ratio when being furnace design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329303.2A CN109579044B (en) | 2018-11-09 | 2018-11-09 | Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329303.2A CN109579044B (en) | 2018-11-09 | 2018-11-09 | Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace |
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| Publication Number | Publication Date |
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| CN109579044A true CN109579044A (en) | 2019-04-05 |
| CN109579044B CN109579044B (en) | 2021-01-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596415A (en) * | 2020-12-18 | 2021-04-02 | 上海明华电力科技有限公司 | Combustion engine combustion optimization closed-loop control method with feedforward |
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