CN106801139A - Annealing furnace optimization of air-fuel ratio method - Google Patents
Annealing furnace optimization of air-fuel ratio method Download PDFInfo
- Publication number
- CN106801139A CN106801139A CN201710037825.4A CN201710037825A CN106801139A CN 106801139 A CN106801139 A CN 106801139A CN 201710037825 A CN201710037825 A CN 201710037825A CN 106801139 A CN106801139 A CN 106801139A
- Authority
- CN
- China
- Prior art keywords
- burner
- air
- annealing furnace
- annealing
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
Abstract
The present invention relates to annealing furnace optimization of air-fuel ratio method, in turn include the following steps：Step 1：In annealing furnace blowing out, the air mass flow pressure difference of each burner of annealing furnace is adjusted；Step 2：Under furnace operating state of annealing, the gas flow pressure difference of each burner of annealing furnace is adjusted；Step 3：Waste-gas analysis is carried out under furnace operating state of annealing；Air, gas proportion balance, improve annealing furnace heating uniformity and the thermal efficiency, it is ensured that the mechanical performance of galvanizing production when solving annealing furnace all burner combustions.
Description
Technical field
The present invention relates to combustion control system, in particular it relates to a kind of annealing furnace optimization of air-fuel ratio method.
Background technology
This steel cold rolling mill 2# galvanizing units are gone into operation and 2005, and the unit ran for more than 10 years, old by equipment and pipeline
Change influence, cause the uneven burning of each burner air, coal gas, accelerating part burner broken speed, influence annealing stove heat is equal
Even property and the thermal efficiency.The present invention can solve air during annealing furnace all burner combustions, gas proportion balance, improve annealing furnace and add
Thermal uniformity and the thermal efficiency, the usage cycles of service life of radiant tubes.2# galvanizing units join method annealing furnace using U.S. steel, due to strip table
Face does not have iron oxide, reducing atmosphere that in the lehr then need not be very strong, therefore can reduce the content of hydrogen in stove, reduces
The possibility of blast.Heated using total radiation pipe in addition, its control for controlling to adjust also than directly being heated with fuel burner nozzle is held
It is easy to get many.
Galvanizing raw sheet will reach two purposes by annealing furnace.First, strip will be heated to a constant temperature in annealing furnace
Degree, completes control heating or completes recrystallization annealing, to control the mechanical performance of strip；Strip is preheated in preheating furnace first
To recrystallization temperature, then strip is heated to more than recrystallization temperature and is incubated in reduction furnace, soaking, last strip is cold
But section is cooled into zinc pot temperature.Second, to make strip that there is the spongy pure iron that an oxide-free for cleaning is present to live
Property surface, and make strip hermetically into zinc pot in carry out galvanizing, hermetically enter people's zinc pot reach zinc-plated purpose, therefore
We will aborning control heating and chilling temperature of the strip at each section.Simultaneously will be using the method for protective gas purging reduction
Remove belt steel surface oxide, and ensure strip will not re-oxidation, therefore will control burning gases flow composition and
Furnace pressure.In U.S. steel connection method hot dip galvanizing annealing process, preheating section, radiant tube bringing-up section, soaking zone, quick spray cooling are broadly divided into
Section, outlet section (including an equalization channel and a tension unit).
Strip after being heated enters radiant tube heating furnace, and the effect of reduction furnace is mainly the iron scale of belt steel surface
It is reduced to be suitable for zinc-plated active spongy pure iron layer.Strip is set to complete at a suitable temperature again by radiant heating in addition
Recrystallization annealing temperature.Reduction furnace is generally through type roll-type stove, and body of heater shell is reinforced by steel plate and constituted, the welding procedure of whole body of heater
It is required that very tight, any solder joint position, not only to ensure that enough intensity will also ensure sealing, furnace wall is using insulation material and resistance to
Firebrick is built into, and body of heater both sides are provided with the circular hole for installing hearth roll and radiant tube, and each hole is welded with ring flange, reduction furnace radiation
In the both sides of body of heater, fuel gas, by burning nozzle in radiation combustion inner pipe, and is carried out pipe interlaced arrangement through pipeline by tube wall
Heat radiation, reaches the purpose of indirectly heat, and radiant tube is W type pipes.Being radiated the temperature of environment can reach 980 DEG C, therefore, spoke
Penetrating pipe requirement material will necessarily get well, and typically all using Ni, Cr alloy to be made in wells and radiant tube will ensure oxidizing atmosphere to protect
The service life of radiant tube is demonstrate,proved, under non-oxidizing atmosphere, because oxygen is not enough in pipe, coal gas amount is superfluous, unnecessary for radiant tube
CO can produce following chemical reaction with tube wall at high temperature：
6Fe+2CO=2Fe3C+O2
Cementite is formed on tube wall, pipe is become fragile, cracked, in addition radiant tube under conditions of high temperature, due to
There is substantial amounts of N in protective gas2, nitriding phenomenon can be produced, in practice it has proved that, temperature is higher, and nitrogen content is higher, and nitriding phenomenon is just
It is more serious, but nitriding can't directly contribute the destruction of pipe, only in high oxidation atmosphere, can just make the pipe of nitriding along
Nitride is consumingly oxidized, and causes radiation to rupture.Because in rotation process belt steel surface can produce the hearth roll of bending
Scratch, can also cause strip sideslip in stove, change the sealing after the most important points for attention of hearth roll are back dress, roller two ends
The conical section of sealing is equipped with dividing plate, wherein being filled with hairy heat-insulating material, inside is marked with sealing lubricating oil fat, this grease tool
There is high temperature resistant, ageing-resistant.The features such as greasy property is good, and certain sealing function can be played, hearth roll is typically with protection
Air seal, with nitrogen by pipeline to uninterruptedly being purged at each hearth roll axle envelope, to ensure that oxygen does not penetrate into stove
It is interior.
Burner is push-pull type, and combustion air is sent into burner by burner air fan.In each input gas area
Domain, by control valve for coal gas, burner is divided into 5 independent control areas, and negative pressure is formed in waste gas dust suction.Combustion System region
Monitoring be relevant with the temperature set-point of two thermocouples installed in combustion chamber.In automatic control state or manually control shape
Under state, temperature set-point is determined by Mathematical Modeling.In normal operating, two average values of thermocouple are used.Once
Break down, simply use a value for thermocouple.In the first region, in order to provide best ratio of combustion, it is necessary to Gas Flow
Amount can jointly be adjusted by controlling valve with combustion-supporting conveying fan.In transient phases, in order to ensure oxidation mixture, if required
Energy reduction, the coal gas of conveying reduces first；If the energy of demand increases, defeated air is improved first.Work as O2Content ratio
When set point is low, ratio of combustion (O2Content) and burning quality (CO contents) be by O2Analyzer and CO analyzers burn at each
The constant monitoring of rank, O2Analyzer and CO analyzers are arranged in analyzer cabinet, equipped with sample valve so as to air/gas ratio in cabinet
The limit adjustment can apply.Once combustion flame is faulty, coal gas by independent control box come the influential combustion of signal cut
Burner.Operator is notified by warning system and combustion system, operator is by considering the correction air in debt of other burners
Flow.
The content of the invention
Annealing furnace optimization of air-fuel ratio method, for solving air during annealing furnace all burner combustions, gas proportion balance, carries
Annealing furnace heating uniformity high and the thermal efficiency, it is ensured that the mechanical performance of galvanizing production.
To achieve the above object, the present invention uses following technical proposals：The balance of air is always first carried out, and is existed as far as possible
Carried out when stove is cold, to avoid the factor of the influence air-fuel ratio in balance.
A- air balances：In stove blowing out
1- opens all of air control valve (100% opens)；
2- is set to combustion air flow control loop in the region to be adjusted the set point of inside；
3- is the set point of combustion-supporting air flow amount controller at least provided with to doing the 80% of big flow；.
Each burner air mass flow Δ P (pressure difference) that 4- records are measured；
5- calculates the average value of pressure differential deltap P；
6- positioning finds those burners of burner Δ P higher than average value, adjusts these burners (by closing air adjustment
Valve) Δ P makes it equal to average value and subtracts ε (ε is an estimated value, in order to reduce regulated quantity, for be adjusted first burning
Mouth, this value should be larger, and reduction progressively；)
7- records the measured value (not adjusting anything) of each burner Δ P；
8- returns to the 5th step, and until all air mass flow Δ P regulations, to that can receive scope, (it depends on air mass flow
The state quality that the fluctuation of Δ P and the five, the six steps are completed)；
B- gas balances (under stove running status)
Under operation, we do not go to touch gas regulator 1- stoves, it is kept intact.
The all burners to be adjusted of 2- must be able to work, must make great efforts to make the burner of work as most as possible.
3- is burning gas flow controller set point at least provided with to the 60% of maximum stream flow.
(flow of combustion air automatically will be controlled to set by air-fuel ratio)
Record the measured value of each burner gas flow Δ P.
5- calculates the average value of Δ P (pressure difference)
6- is set to that to find burner pressure differential deltap P sub-average, adjusts the regulation of these burners (by the regulating valve that turns on the gas-fire)
To Δ P=average values+ε
7- records Δ P (pressure difference) measured value (not making any adjustments) of each burner gas flow
8- returns to the 5th step, until all coal gas amount of differential pressure are in tolerance interval.
C- waste-gas analysis (under stove running status)
1- setting regions load at least wants 60%
2- records O2 and CO content of each burner in waste gas
O2 (should depend on carrying) between 4%~8%
CO should be less than 30ppm (when furnace be higher than 700 DEG C), if furnace temperature is relatively low, CO contents should be up to
500ppm。
The key point of this patent must assure that all burners being capable of normal combustion when being and adjusting.
The beneficial effects of the invention are as follows：
Annealing furnace optimization of air-fuel ratio method of the invention has advantages below：Ensure all burner combustion space-times of annealing furnace
Gas, gas proportion balance, improve annealing furnace heating uniformity and the thermal efficiency, it is ensured that the mechanical performance of galvanizing production；Reduce in stove
The content of hydrogen, reduces the possibility of blast.Heated using total radiation pipe in addition, it is controlled to adjust also than directly being burnt with combustion gas
The control of mouth heating is much easier, greatlys save the energy, increased the service life of equipment.
Specific embodiment
Embodiment 1：
Step 1：In annealing furnace blowing out, the air mass flow pressure difference of each burner of annealing furnace is adjusted；The step 1 is specifically grasped
It is followed successively by：During annealing furnace blowing out, air balance in annealing furnace, (1) 100% opens all of air control valve；(2) annealing
Combustion air flow control loop in all regions of stove is set to the set point of inside；(3) set point of the inside is set
To the 80%~90% of maximum combustion air flow；(4) each the burner air mass flow pressure difference measured is recorded, pressure difference is calculated
Average value；(5) positioning finds burner of the pressure differential higher than average value, high by closing pressure differential described in air adjustment valve regulation
In the burner of average value, its pressure differential is set to subtract estimated value equal to the average value；(6) measurement of each burner pressure differential is recorded
Value, calculates the average value of pressure differential, adjusts air control valve, until the average value all burner pressure differentials regulation to pressure differential
Subtract estimated value.
Step 2：Under furnace operating state of annealing, the gas flow pressure difference of each burner of annealing furnace is adjusted；In annealing furnace fortune
Under row state, gas balance in annealing furnace, under operation, gas regulator is remained stationary as (1) stove；(2) keep all
Burner normal work；(3) burning gas flow controller set point is set as the 60% of maximum stream flow, combustion air flow will
Automatically controlled to set by air-fuel ratio, record the measured value of each burner gas flow pressure differential, then calculate the flat of pressure differential
Average；(4) positioning finds the sub-average burner of pressure differential, and turn on the gas-fire pressure differential subaverage described in regulation valve regulation
Burner, make it equal to pressure differential average value plus estimated value；(5) differential pressure measurement of each burner gas flow is recorded,
The average value of pressure differential is calculated, estimated value is added until all coal gas amount of differential pressure are equal to pressure differential average value.
Step 3：Waste-gas analysis is carried out under furnace operating state of annealing, step 3 concrete operations are followed successively by：In annealing furnace operation
Waste-gas analysis is carried out under state, (1) setting regions load at least wants 60%；(2) O of each burner in waste gas is recorded2And CO
Content, O2Should be between 4%~8%, when furnace temperature of annealing is higher than 700 DEG C, CO is less than 30ppm, if furnace temperature is less than 700
DEG C when, CO contents are up to 500ppm.
Claims (4)
1. annealing furnace optimization of air-fuel ratio method, it is characterised in that in turn include the following steps：Step 1：In annealing furnace blowing out,
Adjust the air mass flow pressure difference of each burner of annealing furnace；Step 2：Under furnace operating state of annealing, annealing furnace each burner is adjusted
Gas flow pressure difference；Step 3：Waste-gas analysis is carried out under furnace operating state of annealing.
2. annealing furnace optimization of air-fuel ratio method according to claim 1, it is characterised in that step 1 concrete operations according to
It is secondary to be：During annealing furnace blowing out, air balance in annealing furnace, (1) 100% opens all of air control valve；(2) annealing furnace institute
There is the combustion air flow control loop in region to be set to the set point of inside；(3) set point of the inside is set to most
The 80%~90% of big combustion air flow；(4) each the burner air mass flow pressure difference measured is recorded, the flat of pressure difference is calculated
Average；(5) positioning finds burner of the pressure differential higher than average value, by closing pressure differential described in air adjustment valve regulation higher than flat
The burner of average, makes its pressure differential subtract estimated value equal to the average value；(6) measured value of each burner pressure differential is recorded,
The average value of pressure differential is calculated, air control valve is adjusted, subtracted to the average value of pressure differential until the regulation of all burner pressure differentials
Remove estimated value.
3. annealing furnace optimization of air-fuel ratio method according to claim 1, it is characterised in that step 2 concrete operations according to
It is secondary to be：Under furnace operating state of annealing, gas balance in annealing furnace, under operation, gas regulator keeps not (1) stove
It is dynamic；(2) all burner normal works are kept；(3) burning gas flow controller set point is set as the 60% of maximum stream flow,
Combustion air flow automatically will be controlled to set by air-fuel ratio, record the measured value of each burner gas flow pressure differential, then
Calculate the average value of pressure differential；(4) positioning finds the sub-average burner of pressure differential, turns on the gas-fire and is pressed described in regulation valve regulation
The sub-average burner of power difference, makes it equal to pressure differential average value plus estimated value；(5) each burner gas flow is recorded
Differential pressure measurement, calculates the average value of pressure differential, and estimated value is added until all coal gas amount of differential pressure are equal to pressure differential average value.
4. annealing furnace optimization of air-fuel ratio method according to claim 1, it is characterised in that step 3 concrete operations according to
It is secondary to be：Waste-gas analysis is carried out under furnace operating state of annealing, (1) setting regions load at least wants 60%；(2) each burner is recorded
O in waste gas2With CO contents, O2Should be between 4%~8%, when furnace temperature of annealing is higher than 700 DEG C, CO is less than 30ppm,
If furnace temperature is less than 700 DEG C, CO contents are up to 500ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710037825.4A CN106801139A (en) | 2017-01-19 | 2017-01-19 | Annealing furnace optimization of air-fuel ratio method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710037825.4A CN106801139A (en) | 2017-01-19 | 2017-01-19 | Annealing furnace optimization of air-fuel ratio method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106801139A true CN106801139A (en) | 2017-06-06 |
Family
ID=58985686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710037825.4A Pending CN106801139A (en) | 2017-01-19 | 2017-01-19 | Annealing furnace optimization of air-fuel ratio method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106801139A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184448A (en) * | 2019-06-11 | 2019-08-30 | 首钢京唐钢铁联合有限责任公司 | A method of adjustment annealing furnace air-fuel ratio |
| CN114507777A (en) * | 2020-11-16 | 2022-05-17 | 上海梅山钢铁股份有限公司 | Furnace pressure control method for horizontal annealing furnace |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5533529A (en) * | 1978-08-30 | 1980-03-08 | Kawasaki Steel Corp | Combustion control method for combustion equipment which allows penetration of outside air |
| JPH06200328A (en) * | 1992-12-28 | 1994-07-19 | Nkk Corp | Combustion method of continuous heating furnace having regenerative type burner |
| EP1757707A2 (en) * | 2001-01-17 | 2007-02-28 | JFE Steel Corporation | Heating furnace having heat regenerating burners and operation method thereof |
| CN101561224A (en) * | 2009-05-15 | 2009-10-21 | 首钢总公司 | Method for controlling combustion atmosphere in large-scale walking beam type plate blank heating furnace |
| CN101655245A (en) * | 2009-09-04 | 2010-02-24 | 江苏焱鑫科技股份有限公司 | Multiparameter automatic control method of industrial furnace burner |
| CN101929736A (en) * | 2009-06-25 | 2010-12-29 | 宝钢新日铁汽车板有限公司 | Temperature control method for heating furnace based on heat accumulating type nozzle |
| CN102636040A (en) * | 2011-02-14 | 2012-08-15 | 宝山钢铁股份有限公司 | Self-study furnace temperature control method and control system |
| CN102937382A (en) * | 2012-11-21 | 2013-02-20 | 中冶南方(武汉)威仕工业炉有限公司 | Adjusting and optimizing method of ratio-controlled combustion system |
-
2017
- 2017-01-19 CN CN201710037825.4A patent/CN106801139A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5533529A (en) * | 1978-08-30 | 1980-03-08 | Kawasaki Steel Corp | Combustion control method for combustion equipment which allows penetration of outside air |
| JPH06200328A (en) * | 1992-12-28 | 1994-07-19 | Nkk Corp | Combustion method of continuous heating furnace having regenerative type burner |
| EP1757707A2 (en) * | 2001-01-17 | 2007-02-28 | JFE Steel Corporation | Heating furnace having heat regenerating burners and operation method thereof |
| CN101561224A (en) * | 2009-05-15 | 2009-10-21 | 首钢总公司 | Method for controlling combustion atmosphere in large-scale walking beam type plate blank heating furnace |
| CN101929736A (en) * | 2009-06-25 | 2010-12-29 | 宝钢新日铁汽车板有限公司 | Temperature control method for heating furnace based on heat accumulating type nozzle |
| CN101655245A (en) * | 2009-09-04 | 2010-02-24 | 江苏焱鑫科技股份有限公司 | Multiparameter automatic control method of industrial furnace burner |
| CN102636040A (en) * | 2011-02-14 | 2012-08-15 | 宝山钢铁股份有限公司 | Self-study furnace temperature control method and control system |
| CN102937382A (en) * | 2012-11-21 | 2013-02-20 | 中冶南方(武汉)威仕工业炉有限公司 | Adjusting and optimizing method of ratio-controlled combustion system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184448A (en) * | 2019-06-11 | 2019-08-30 | 首钢京唐钢铁联合有限责任公司 | A method of adjustment annealing furnace air-fuel ratio |
| CN114507777A (en) * | 2020-11-16 | 2022-05-17 | 上海梅山钢铁股份有限公司 | Furnace pressure control method for horizontal annealing furnace |
| CN114507777B (en) * | 2020-11-16 | 2024-01-05 | 上海梅山钢铁股份有限公司 | Furnace pressure control method of horizontal annealing furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3190194B1 (en) | Method for detecting air flow distribution in blast furnace | |
| CN106521120A (en) | Bearing steel heating decarbonization control method | |
| CN107532270B (en) | Method and device for reaction controlling | |
| RU2592653C2 (en) | Method of controlling protective gas atmosphere in protective gas chamber for treatment of metal strip | |
| CN106801139A (en) | Annealing furnace optimization of air-fuel ratio method | |
| CN102899599B (en) | Control method for reducing generation amount of strip steel zinc crust in starting up hot-dip galvanizing aluminum and zinc machine set | |
| EP3170913A1 (en) | Method and device for reaction control | |
| WO2010134214A1 (en) | Continuous annealing furnace | |
| CN107916385A (en) | Reduce the control method of heat zinc coating plate surface dew iron | |
| EP3114243B1 (en) | Industrial furnace for heating products such as steel products | |
| CN105026598B (en) | The manufacturing method and continuous fusion galvanizing rig of hot-dip galvanized steel sheet | |
| KR20090030515A (en) | Heater for annealing furnace | |
| CN105157019B (en) | A kind of coal oven dithio-gas flame furnace kiln system | |
| CN113136537B (en) | Method for improving surface quality of hot-base galvanized strip steel | |
| JP4873325B2 (en) | In-furnace atmosphere control method for heating furnace | |
| CN209065935U (en) | Blast furnace gas combustion apparatus for baking | |
| CN106967942A (en) | Indirect heating type hot blast is incubated alloying soaking pit and with steel alloying galvanizing system | |
| CN103913056B (en) | Alloy baking method | |
| CN111876578B (en) | Thermal parameter measurement and control method for wheel quenching furnace | |
| CN105018714A (en) | Method for humidifying atmosphere in continuous annealing furnace | |
| CN111218627A (en) | High-temperature metal annealing process | |
| JPS6017020A (en) | Direct firing vertical type continuous annealing furnace | |
| CN219913932U (en) | Rotary hearth furnace combustion system for treating carbon-containing pellets | |
| US2317927A (en) | Combustion control | |
| Kaya et al. | Energy Efficiency in Furnaces |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170606 |
|
| RJ01 | Rejection of invention patent application after publication |