CN109022648A - A method of control top temperature - Google Patents
A method of control top temperature Download PDFInfo
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- CN109022648A CN109022648A CN201810920876.6A CN201810920876A CN109022648A CN 109022648 A CN109022648 A CN 109022648A CN 201810920876 A CN201810920876 A CN 201810920876A CN 109022648 A CN109022648 A CN 109022648A
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- furnace
- top temperature
- stockline
- damping down
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
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Abstract
The invention belongs to blast furnace process field more particularly to a kind of methods for controlling top temperature.Catch up with stockline to normal stock line level specifically, the following steps are included: carry out drop stockline before (1) damping down checking, stockline control is concentrated after 3.5m or more, checking for the method for control top temperature of the invention, when damping down controls stockline in 1.2-1.5m；(2) after damping down, furnace roof is lighted a fire after purging coal gas is qualified；(3) it is packed into furnace charge；(4) it is packed into capping material, and adjusts capping material in the distribution of charge level.The present invention is by adjusting binder is controlled after the load mode and damping down of furnace charge during damping down the step of, requirement when meeting blast furnace top equipment maintenance to gas concentration and top temperature.
Description
Technical field
The invention belongs to blast furnace process field more particularly to a kind of methods for controlling top temperature.
Background technique
Blast furnace roof ring flat-plate, which refers to, welds a series of unhook in blast furnace furnace body top furnace shell inner surface, and applies between unhook
Smear one layer of refractory material.Under normal production conditions, blast furnace top gas temperature is typically larger than 150 DEG C, and top airtight box is held
The maximum operation temperature received should be lower than 150 DEG C, and the refractory material of blast furnace roof ring flat-plate can be effectively by coal gas of high temperature and furnace roof
Pressure box is kept apart, to guarantee the normal work of top airtight box.
Since furnace roof ring flat-plate works under the coal gas environment of high temperature and high flow rate for a long time, flame retardant coating is corroded by coal gas of high temperature
It fades away with washing away, leads to furnace roof top casing temperature rapid increase, top airtight box operating temperature is caused to gradually rise,
Influence its normal work.Therefore, it is necessary to periodically carry out spray refractory coating to blast furnace roof ring flat-plate.
When carrying out blast furnace roof ring flat-plate spraying operation after damping down, need from the big manhole of furnace roof to furnace inside lap operation horizontal
Platform, operating personnel, which wears proximity suit and enters, carries out spraying operation on workbench, the above-mentioned activity duration needs 12-16 hours, this
It requires to control in this stage top temperature to 100 DEG C or less.Meanwhile furnace roof needs to light a fire after damping down, consumes coal gas in furnace, protects
Demonstrate,prove furnace in gas concentration in safe range.
After blast furnace staying, since chemical action still occurs for furnace charge in furnace, also has blast furnace gas and formed, coal gas is dense in furnace
It spends still larger, it is generally the case that need to carry out furnace roof igniting operation.And blast furnace gas is when lower part is gradually increasing out of furnace, heat
Amount also moves up therewith, if not controlling its ascendant trend, the temperature in furnace roof space can reach 150 DEG C or more in a short time, in above-mentioned coal
Under gas concentration and in-furnace temperature, spraying operation personnel cannot be introduced into operation in furnace.
Guarantee that the above-mentioned working time has very big technical difficulty by controlling top temperature, therefore, it is necessary to study
The method for how controlling top temperature.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of methods for controlling top temperature.
Specifically, the present invention provides a kind of methods for controlling top temperature, comprising the following steps:
(1) drop stockline is carried out before damping down checking, stockline control is concentrated after 3.5m or more, checking and catches up with stockline to regular burden(ing)
Line is horizontal, and when damping down controls stockline in 1.2-1.5m；
(2) after damping down, furnace roof is lighted a fire after purging coal gas is qualified；
(3) it is packed into furnace charge；
(4) it is packed into capping material, and adjusts capping material in the distribution of charge level.
The method of above-mentioned control top temperature in the step (1), carries out drop stockline in 1 hour before damping down checking.
The method of above-mentioned control top temperature in the step (1), concentrates the time control node for catching up with stockline are as follows: the
One batch of material charge time is controlled in 10-12min；Second batch of material charge time is controlled in 15-20min；Third batch charge time control
System is in 20-25min.
The method of above-mentioned control top temperature in the step (1), controls top temperature≤150 DEG C before damping down checking,
It is 110 ± 10 DEG C that top temperature is controlled when damping down and checking.
The method of above-mentioned control top temperature, the step (3) are to be packed into 3 batches of batch weight and the consistent furnace charge of damping down material.
The method of above-mentioned control top temperature, in step (3), the depth for being packed into stockline before furnace charge is 3.5-
4.5m。
The method of above-mentioned control top temperature, in step (3), the furnace charge furnace inside edge discharging point away from furnace wall
Distance be 350-450mm.
The method of above-mentioned control top temperature, the capping material are blast furnace granulated slag.
The method of above-mentioned control top temperature in the step (4), is packed into two batches capping material, wherein first capping
Material is mainly distributed in furnace inward flange to furnace intermediate ring belt area, second batch capping material integrated distribution in furnace intermediate annulus to furnace
Interior central area.
The method of above-mentioned control top temperature, the capping material is in furnace with a thickness of 300-350mm.
The present invention is by adjusting binder is controlled after the load mode and damping down of furnace charge during damping down the step of, thus full
Requirement when sufficient blast furnace top equipment is safeguarded to gas concentration and top temperature.Specifically, the beneficial effect of technical solution of the present invention
Fruit is as follows:
1. the present invention can efficiently control the rise rate of blast furnace roof temperature, can meet needed for furnace roof ring flat-plate spraying operation
Time 12-16 hour；
2. after the present invention is implemented, blast furnace air-supply restores unaffected, air-supply recovery time is 4-6 hours, with normal service
Operation air-supply restores indifference；
3. being the inspection of blast furnace it is also possible to apply the invention to the blast furnace roof upkeep operation that other require coal gas and temperature
It repairs and the guarantee of safety and time is provided；
4. the present invention can solve in maintenance repair operation process, after furnace roof igniting top temperature it is excessively high and caused by it is airtight
Case damages problem.
Specific embodiment
In order to fully understand the purpose of the present invention, feature and effect, by following specific embodiments, the present invention is made detailed
It describes in detail bright.For process of the invention in addition to following the description, remaining is all made of the conventional method or device of this field.Following nouns
Term is unless otherwise stated, all have the normally understood meaning of those skilled in the art.
The method of control top temperature of the invention is suitable for heat size greater than 4000m3Blast furnace.
Specifically, a kind of method for controlling top temperature provided by the invention, comprising the following steps:
(1) drop stockline is carried out before damping down checking, stockline control is concentrated after 3.5m or more, checking and catches up with stockline to regular burden(ing)
Line is horizontal, and when damping down controls stockline in 1.2-1.5m.
For bell-less blast furnace, stockline depth refer to throat armour upper edge be 0, from this to charge level it is vertical away from
From for stockline depth, wherein normal stock line level is 1.2-1.5m.
Wherein, when stockline control is in 1.2-1.5m range, top temperature is conducive to furnace roof igniting up to 100-120 DEG C.
The present invention first controls stockline in 3.5m or more before damping down checking, and checking stage concentration catches up with stockline to normal stockline
It is horizontal, it is therefore an objective to reduce and newly enter the time that furnace furnace charge is contacted with coal gas, extend the time for preheating new loading furnace charge, be conducive to control
The rise speed of top temperature processed.
In some preferred embodiments, the present invention carries out drop stockline in 1 hour before damping down checking.
Wherein, the time control node for catching up with stockline is concentrated after checking are as follows: the first batch of material charge time is controlled in 10-12min；
Second batch of material charge time is controlled in 15-20min；Third batch charge time control is in 20-25min.
After checking, physical-chemical reaction is accordingly reduced in furnace, and the decrease speed of furnace charge slows down, above-mentioned time control node
It obtains, is to go out the decrease speed of furnace charge by corresponding to the level calculation of air quantity after checking, and then determine control charge time.Example
Such as: air quantity 6000m3When/min, the decrease speed 5.98m/h of furnace charge, air quantity 4000m3When/min, the decrease speed of furnace charge
3.48m/h。
In some preferred embodiments, blast furnace roof temperature≤150 DEG C are controlled before damping down checking, when damping down and checking
Controlling top temperature is 110 ± 10 DEG C.
Wherein, top temperature≤150 DEG C purpose is protection top airtight box, and the operating temperature requirements of top airtight box are lower than
150℃.Top temperature controls 100-120 DEG C after damping down, is conducive to the evaporation of furnace charge moisture, because of furnace charge moisture when reducing furnace roof igniting
Furnace roof charge level is caused to be not easy to catch fire greatly.
(2) after damping down, furnace roof is lighted a fire after purging coal gas is qualified；
After damping down, gas concentration is can be effectively controlled in safe range in furnace roof igniting.
(3) it is packed into furnace charge；
After furnace roof is lighted a fire, stockline depth 3.5-4.5m at this time.Then, 3 batches of batch weight and the consistent furnace of damping down material are packed into
Material, to persistently inhibit the rise of top temperature.Cloth angle is adjusted according to stockline depth, makes furnace charge falling in furnace inside edge
Distance of the shots away from furnace wall is 350-450mm.
During cloth, be computed distance of the discharging point away from furnace wall be 350-450mm when, due to the rolling of furnace charge
Property, only part furnace charge slide to furnace inside edge, the furnace charge thinner thickness of furnace inward flange, and gas permeability preferably has conducive to edge airflow
Control, for blast furnace staying recovery provide conveniently.
(4) it is packed into capping material, and adjusts capping material in the distribution of charge level.
Wherein, the capping material is blast furnace granulated slag dry and with heat insulating function.
Preferably, it is packed into two batches capping material, wherein first capping material is mainly distributed in furnace inward flange to furnace intermediate ring
Region, second batch capping material integrated distribution central area in intermediate annulus to furnace in furnace.
Distribution of the present invention by adjusting capping material in charge level, the flame for making furnace roof charge level center have a ring faint, and
The slow-paced trend of top temperature rise is formed, can either guarantee that interior top temperature does not surpass operating personnel at work in this way
Upper limit value, and ensure that above-mentioned binder operation has no adverse effects to blast furnace air-supply recovering process.
In some preferred embodiments, the capping material is in furnace with a thickness of 300-350mm.
According to the number of furnace top coal quantity after the characteristic of selected capping material and damping down, the thickness of capping material can be calculated
In 300-350mm, the heat that stock gas is taken out of can be absorbed by capping material, while the thickness of the capping material of 300-350mm
The gas permeability that will not influence furnace charge does not influence the distribution of Gas Flow in furnace after air-supply.
In some preferred embodiments, the method for control top temperature of the invention the following steps are included:
1) furnace charge load mode before adjustment damping down
1 hour before damping down checking, start to drop stockline to 3.5m, top temperature controls within 150 DEG C, after checking, concentrates
It catches up with stockline, when damping down, stockline is controlled to 1.5m, temperature is pushed up and maintains 110 DEG C ± 10 DEG C.
Wherein, the time control node for catching up with stockline is concentrated after checking are as follows: the first batch of material charge time is controlled in 10-12min；
Second batch of material charge time is controlled in 15-20min；Third batch charge time control is in 20-25min.
2) stock gas is lighted a fire
After damping down, after coal gas purging is qualified, the igniting of furnace roof tissue.
3) binder rate-determining steps after damping down
After furnace roof is lighted a fire, stockline depth 3.5-4.5m at this time.Tissue is packed into 3 batches of furnace charges, the batch weight and damping down of furnace charge
Material is consistent, adjusts cloth angle according to stockline depth, guarantees that furnace charge away from the distance of furnace wall in the discharging point of furnace inside edge
Within the scope of 350-450mm.
4) it is packed into capping material
A capping material ingredient
Capping material ingredient: blast furnace granulated slag.
The preparation of b capping material
Blast-furnace slag (60-80t) is transported on sunning platform by damping down the last week, and clinker stirs in establishment officer, makes
It is completely dried.On the day before damping down, dry clinker is transported under slot spare in blow tank.
C capping material loading pattern
2 batches of capping material of tissue altogether, every batch of capping material 30t, during first grain slag is mainly distributed in furnace inward flange to furnace
Between ring belt area, second batch grain slag integrated distribution central area in intermediate annulus to furnace in furnace.Keep capping material thick in furnace
Spend 300-350mm.
In the following, the specific embodiment of the present invention is described in detail by taking No. 5 blast furnaces of Taiyuan Iron and Steel Co. as an example.It is specific real
Apply that steps are as follows:
1,4:40 starts to drop stockline, and 5:40 stockline drops to 3.5m.Checking (5:40) starts to catch up with stockline, stockline when 6:40 damping down
To 1.5m, 115 DEG C of top temperature.
Wherein, it is concentrated after checking and catches up with stockline process are as follows: the first batch of material charge time is controlled in 10min；The charging of second batch of material
Time controls in 18min；Third batch charge time control is in 25min.
2, the operating procedure of damping down operation is carried out.
3, after damping down purging coal gas is qualified, the igniting of 9:30 furnace roof, stockline height is about 3.5m at this time.
4, (10:00) binder 3 batches after furnace roof igniting.Specific binder cloth mode is shown in Table 1.
The cloth mode of binder after the igniting of 1 furnace roof of table
| 1st batch | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| It charges angle (degree) | 37 | 35 | 33 | 31 | 29 | 27 | 25 | 23 | 20 | |
| C (ring) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | |
| O (ring) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | ||
| 2nd batch | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| It charges angle (degree) | 38 | 36 | 34 | 32 | 30 | 28 | 26 | 23 | 20 | |
| C (ring) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | |
| O (ring) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | ||
| 3rd batch | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| It charges angle (degree) | 39 | 37 | 35 | 33 | 31 | 29 | 27 | 25 | 23 | 20 |
| C (ring) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| O (ring) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
Wherein, symbol " C " indicates that coke, symbol " O " indicate ore.
In table 1, coke in the 1st batch of material corresponding 37 ° of charging angle, 35 °, 33 °, 31 °, 29 °, 27 °, 25 °,
Plant 2 circle coke at 23 ° respectively, the middle ore of the 1st batch of material corresponding 37 ° of charging angle, 35 °, 33 °, 31 °, 29 °, 27 °,
2 circle ores are planted at 25 °, 23 °, 20 ° respectively.The middle coke of 2nd batch of material charges in table 1 and plants 2 circle coke respectively under angle,
The middle ore of 2nd batch of material charges in table 1 and plants 2 circle ores respectively under angle.The middle coke of 3rd batch of material charges angle in table 1
Plant 2 circle coke under degree respectively, the middle ore of the 3rd batch of material charges in table 1 and plants 2 circle ores respectively under angle.
After the binder cloth mode binder of table 1, furnace charge is away from the distance of furnace wall in the discharging point of furnace inside edge
410mm。
5, furnace roof gland fabric
2 batches, tissue dry capping material (11:20) altogether, every batch of capping material 30t.The cloth mode of every batch of capping material is shown in Table
2。
The cloth mode of 2 capping material of table
| 1st batch | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| It charges angle (degree) | 37 | 35 | 33 | 31 | 29 | 27 | 25 | 23 | 20 | |
| Ring | 3 | 3 | 3 | 2 | 2 | 2 | 2 | |||
| 2nd batch | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| It charges angle (degree) | 38 | 36 | 34 | 32 | 30 | 28 | 26 | 23 | 20 | 16 |
| Ring | 2 | 2 | 2 | 2 | 2 | 2 |
In table 2, the 1st batch of material capping material is in charging 37 ° of angle, 35 °, 33 °, 31 °, 29 °, 27 °, 25 ° of lower cloth accordingly
Under circle number be respectively 3,3,3,2,2,2,2.2nd batch of capping material corresponding 30 ° of charging angle, 28 °, 26 °, 23 °, 20 °,
The circle number planted at 16 ° is respectively 2,2,2,2,2,2.
Cloth is carried out according to the capping material cloth mode of table 2, capping material is in furnace with a thickness of 320mm.Wherein, first is covered
Fabric is mainly distributed in furnace inward flange to furnace intermediate ring belt area, and intermediate annulus is extremely in furnace for second batch capping material integrated distribution
Central area in furnace.
Through detecting, after furnace roof gland fabric, gas concentration is lower than 80ppm in furnace, and maintenance personal wears positive pressure respirator can
It works in into furnace.75 DEG C of in-furnace temperature when beginning, after holding time 16 hours, in-furnace temperature is slowly increased to 110 DEG C, is ring flat-plate
Spraying operation provides a strong guarantee.
It is maintained 16 hours it can be seen that successfully being realized with the method for the present invention in the case where meeting job requirement top temperature
Requirement, the sufficient working time is provided for blast furnace roof ring flat-plate spraying operation.
The present invention is hereinbefore disclosed with preferred embodiment, but it should be understood by those skilled in the art that, these
Embodiment is only used for describing the present invention, but should not be understood as limiting the scope of the invention.It should be noted that all implement with these
Example equivalent variation and displacement, should all be set as being covered by scope of the presently claimed invention.Therefore, protection scope of the present invention
It should be subject to range defined in claims.
Claims (10)
1. a kind of method for controlling top temperature, which comprises the following steps:
(1) drop stockline is carried out before damping down checking, stockline control is concentrated after 3.5m or more, checking and catches up with stockline to normal stockline water
Flat, when damping down, controls stockline in 1.2-1.5m；
(2) after damping down, furnace roof is lighted a fire after purging coal gas is qualified；
(3) it is packed into furnace charge；
(4) it is packed into capping material, and adjusts capping material in the distribution of charge level.
2. the method for control top temperature according to claim 1, which is characterized in that in the step (1), damping down checking
Carry out drop stockline within first 1 hour.
3. the method for control top temperature according to claim 1, which is characterized in that in the step (1), concentration catches up with material
The time control node of line are as follows: the first batch of material charge time is controlled in 10-12min；Second batch of material charge time is controlled in 15-
20min；Third batch charge time control is in 20-25min.
4. the method for control top temperature according to claim 1, which is characterized in that in the step (1), damping down checking
Preceding control top temperature≤150 DEG C, control top temperature is 110 ± 10 DEG C when damping down and checking.
5. the method for control top temperature according to claim 1, which is characterized in that the step (3) is to be packed into 3 batches batches
Weight and the consistent furnace charge of damping down material.
6. the method for control top temperature according to claim 1, which is characterized in that in step (3), the loading furnace charge
The depth of preceding stockline is 3.5-4.5m.
7. the method for control top temperature according to claim 5, which is characterized in that in step (3), the furnace charge is in furnace
Distance of the discharging point of inside edge away from furnace wall is 350-450mm.
8. the method for control top temperature according to claim 1, which is characterized in that the capping material is blast furnace granulated slag.
9. the method for control top temperature according to claim 1 or 8, which is characterized in that in the step (4), be packed into
Two batches capping material, wherein first capping material is mainly distributed in furnace inward flange to furnace intermediate ring belt area, second batch capping material
Integrated distribution central area in intermediate annulus to furnace in furnace.
10. the method for control top temperature according to claim 9, which is characterized in that capping material thickness in furnace
For 300-350mm.
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| CN201810920876.6A CN109022648B (en) | 2018-08-14 | 2018-08-14 | Method for controlling furnace top temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110643761A (en) * | 2019-04-11 | 2020-01-03 | 广东韶钢松山股份有限公司 | Blast furnace top ignition method |
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| CN110643761A (en) * | 2019-04-11 | 2020-01-03 | 广东韶钢松山股份有限公司 | Blast furnace top ignition method |
| CN110643761B (en) * | 2019-04-11 | 2021-08-31 | 广东韶钢松山股份有限公司 | Blast furnace top ignition method |
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