CN101187531A - Method for controlling heating oven atmosphere reduction oxidized burning damage - Google Patents
Method for controlling heating oven atmosphere reduction oxidized burning damage Download PDFInfo
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- CN101187531A CN101187531A CNA2007100313025A CN200710031302A CN101187531A CN 101187531 A CN101187531 A CN 101187531A CN A2007100313025 A CNA2007100313025 A CN A2007100313025A CN 200710031302 A CN200710031302 A CN 200710031302A CN 101187531 A CN101187531 A CN 101187531A
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- furnace
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Abstract
The invention discloses a method for controlling a furnace atmosphere of a heating furnace and reducing oxidation burning loss. The method is that air supply amount of a combustion-supporting draught fan in the heating furnace which takes light diesel oil or heavy oil as burning medium is controlled in 7500-23000 m3/h, the temperature of combustion-supporting wind is controlled in 300-700 DEG C, the pressure of a furnace tank is controlled in 0-20 Pa, the pressure of the combustion-supporting draught fan is controlled in 5-10 KPa, finally the oxidizing atmosphere of the furnace tank is controlled under 5%. The burning loss of steel products in the heating furnace can be reduced on a great extent through the method, the rate of finished product can be controlled, and a series of quality problem of the steel product which is generated by thermal oxidation is reduced.
Description
Technical field
The present invention relates to heating furnace and Quality Control Technology field, particularly a kind of method of controlling the heating furnace atmosphere reduction oxidized burning damage.
Background technology
Control heating furnace oxidizing atmosphere is the particularly important means of scale on surface of control slab quality.At present both at home and abroad with light diesel fuel and heavy oil heating furnace as combustion medium, because the heating furnace oxidizing atmosphere is too high, causes surface of steel plate iron scale thickness higher, has not only had a strong impact on lumber recovery, and make the slab top layer produce the decarburization phenomenon, thereby influence finally influences the coiled sheet cold-bending property.
Rolling in order to guarantee the back operation, slab comes out to be heated to 1100～1250 ℃ in heating furnace from conticaster, that have even higher temperature, and therefore in heating process, steel and airborne oxygen react, and make great deal of steel oxidized.Steel heat the oxidization burning loss that is produced in heating furnace be inevitably, also is a global problem.
It is necessary that airborne oxygen provides fuel combustion, but the existence of a large amount of oxygen will speed up the carrying out of steel oxidation scaling loss, therefore must strict control oxygen content, obtain an equalization point between the oxidization burning loss can guaranteeing that full combustion of fuel can be controlled again.Oxidizing atmosphere when therefore how to control burning in heating furnace is significant.
Summary of the invention
The purpose of this invention is to provide a kind of method of controlling the heating furnace atmosphere reduction oxidized burning damage, can reduce steel oxidization burning loss in heating furnace by this method, the lumber recovery of control finished product reduces a series of invar material heated oxide and the quality problems that produce.
The objective of the invention is by taking following technical scheme to be achieved: a kind of method of controlling the heating furnace atmosphere reduction oxidized burning damage, it is characterized in that the combustion fan wind supply quantity being controlled at 7500～23000m being in the heating furnace of combustion medium with light diesel fuel or heavy oil
3/ h, the combustion air temperature is controlled at 300 ℃～700 ℃, and furnace pressure is controlled at 0～20Pa, and combustion fan pressure is controlled at 5～10KPa, and burner hearth oxidizing atmosphere is controlled at below 5%.
Characteristics of the present invention are:
1. the combustion fan wind supply quantity is controlled,, reduced burner hearth oxidizing atmosphere simultaneously to the routine test of burner hearth oxygen content.The required air of fuel combustion is delivered in the stove by blower fan, and concerning whole heating furnace, these air will be distributed to each burner place and fuel mix, burn in stove by high-pressure injection.So before the control total blast volume, at first must need to reach how many temperature in the clear and definite burner hearth, how many burners reach this temperature probably needs drop into fully just to reach.Calculation of parameter according to burner type and burner goes out total intake then, certainly in order to make fuel fully complete, air need have certain unnecessary, it is generally acknowledged that coefficient of excess air probably between 1.15～1.20, that is to say that air needs 15%～20% surplus.After calculating the needed total blast volume of burning according to this proportional meter, the air air intake that blower fan provides is controlled, avoided strong wind operation.Because the burner hearth media variations is big, burning and heat transfer type are various, therefore are difficult to the accurate information in the acquisition stove, therefore are necessary regularly the oxygen content in the burner hearth to be measured, and grasp the situation of the dynamic change of oxygen content in the stove.
2. set about from field apparatus,, reach rational air, fuel ratio, make full combustion of fuel by the burner parameter is regulated.Because each burner all is an independently system, wind oil gas also all is to mix at the burner place, is ejected in the stove and reacts.Therefore the amount of each medium of control burner place is vital, and fuel can not complete reaction when burner light a fire, and oxygen content also is the highest, in the presence of after the fire burns along with the oxygen content of carrying out of reacting gradually reduces.When wind oil gas reaches a reasonable proportioning, fuel just can completing combustion.Therefore must calculate and test the pressure of each burner place wind oil gas and flow, so that burning can be carried out fully, heat energy discharges fully, control burning back oxygen content again, minimizing oxygen and steel react.
3. reasonably control and in time adjustment furnace pressure.Concerning heating furnace, furnace pressure is controlled well with bad most important, and furnace pressure is excessive, and furnace gas escapes, and has both lost a large amount of heat energy, and also possible scaling loss equipment also may contaminated environment.Furnace pressure is low excessively, sucks a large amount of cold wind from fire door, and fire box temperature reduces, and the carrying out that the excess air of suction again can the accelerated oxidation reaction makes the steel oxidation scaling loss serious.The heater for rolling steel furnace pressure generally changes in 5～25Pa scope, and when combustion case changes, furnace pressure is also along with variation.Therefore control the effective means that furnace pressure also is the control oxidation, furnace pressure should be controlled at the scope of pressure-fired in the ordinary course of things, and is directly perceived, promptly has a small amount of flare to emerge from the exit and is the best.
Advantage of the present invention is:
1. implementation method is simple, and usage range is wide.The present invention is on existing equipment and personnel's basis, the technical scheme that accumulation is come out in producing through the long-term time.Calculate and to implement by equipment personnel and the on-the-spot trace debug of technologist, do not need extra equipment input and personnel.This method scope of application is wide simultaneously, is applicable to all hot rolling steel mill heating furnaces and other forms of heating furnace.
2. implementation result is obvious.The loss that annual invar material oxidization burning loss causes is quite serious, therefore saves cost, and it is imperative to cut the waste.This method is that the benefit of creation is also very considerable under situation cheaply.Can reduce 10%～20% on the original basis.
The specific embodiment
Below enumerate specific embodiment and be used to set forth the present invention, but the present invention not only is confined to the heating furnace among the embodiment, all fuel oil heatings all are suitable for.
Embodiment 1
The heating furnace type: CSP roller-bottom type soaking pit, the burner type is forced down NO for the BLOOM400 type height that BLOOM company produces
xBurner
Technological parameter: charging temperature: 950 ℃; Combustion air temperature: 400 ℃; Furnace pressure: 3～5Pa; Combustion medium: 0# light diesel fuel; Total burner number: 100; Combustion fan: bringing-up section maximum quantity of wind 23000m
3/ h, soaking zone, ferry-boat section blower fan maximum quantity of wind 7500m
3/ h.
Obtain following result on the basis of the above:
| Tapping temperature (℃) | Consumption (kg/h) during fuel | Single burner oil consumption (kg/h) | Combustion fan pressure (KPa) | Combustion air volume consumes (m 3/h) | Combustion position | Burner hearth O 2Content (%) |
| 1080±10 | 1450±50 | 28 | 7.8 | 15200 | Well | 2.18 |
Embodiment 2
The heating furnace type: CSP roller-bottom type soaking pit, the burner type is forced down NO for the BLOOM400 type height that BLOOM company produces
xBurner
Technological parameter: charging temperature: 980 ℃; Combustion air temperature: 430 ℃; Furnace pressure: 5～10Pa; Combustion medium: 0# light diesel fuel; Total burner number: 100; Combustion fan: bringing-up section maximum quantity of wind 23000m
3/ h, soaking zone, ferry-boat section blower fan maximum quantity of wind 7500m
3/ h.
Obtain following result on the basis of the above:
| Tapping temperature (℃) | Consumption (kg/h) during fuel | Single burner oil consumption (kg/h) | Combustion fan pressure (KPa) | Combustion air volume consumes (m 3/h) | Combustion position | Burner hearth O 2Content (%) |
| 1130±10 | 1750±50 | 28 | 8 | 21280 | Well | 2.63 |
Embodiment 3
The heating furnace type: CSP roller-bottom type soaking pit, the burner type is forced down NO for the BLOOM400 type height that BLOOM company produces
xBurner
Technological parameter: charging temperature: 1000 ℃; Combustion air temperature: 460 ℃; Furnace pressure: 8～12Pa; Combustion medium: 0# light diesel fuel; Total burner number: 100; Combustion fan: bringing-up section maximum quantity of wind 23000m
3/ h, soaking zone, ferry-boat section blower fan maximum quantity of wind 7500m
3/ h.
Obtain following result on the basis of the above:
| Tapping temperature (℃) | Consumption (kg/h) during fuel | Single burner oil consumption (kg/h) | Combustion fan pressure (KPa) | Combustion air volume consumes (m 3/h) | Combustion position | Burner hearth O 2Content (%) |
| 1170±10 | 2040±50 | 28 | 8.2 | 25840 | Well | 2.76 |
Claims (1)
1. a method of controlling the heating furnace atmosphere reduction oxidized burning damage is characterized in that: being in the heating furnace of combustion medium with light diesel fuel or heavy oil, the combustion fan wind supply quantity is controlled at 7500～23000m
3/ h, the combustion air temperature is controlled at 300 ℃～700 ℃, and furnace pressure is controlled at 0～20Pa, and combustion fan pressure is controlled at 5～10KPa, and burner hearth oxidizing atmosphere is controlled at below 5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100313025A CN101187531A (en) | 2007-11-08 | 2007-11-08 | Method for controlling heating oven atmosphere reduction oxidized burning damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100313025A CN101187531A (en) | 2007-11-08 | 2007-11-08 | Method for controlling heating oven atmosphere reduction oxidized burning damage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101187531A true CN101187531A (en) | 2008-05-28 |
Family
ID=39480025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100313025A Pending CN101187531A (en) | 2007-11-08 | 2007-11-08 | Method for controlling heating oven atmosphere reduction oxidized burning damage |
Country Status (1)
| Country | Link |
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| CN (1) | CN101187531A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014593A (en) * | 2014-05-30 | 2014-09-03 | 济钢集团有限公司 | Method for controlling surface piebald defect of structural low alloy steel medium and thick plates |
| CN104100995A (en) * | 2014-07-14 | 2014-10-15 | 首钢总公司 | Heating furnace heat load distribution method and device |
-
2007
- 2007-11-08 CN CNA2007100313025A patent/CN101187531A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014593A (en) * | 2014-05-30 | 2014-09-03 | 济钢集团有限公司 | Method for controlling surface piebald defect of structural low alloy steel medium and thick plates |
| CN104100995A (en) * | 2014-07-14 | 2014-10-15 | 首钢总公司 | Heating furnace heat load distribution method and device |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080528 |