CN106702049B - Method for maintaining furnace hearth - Google Patents
Method for maintaining furnace hearth Download PDFInfo
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- CN106702049B CN106702049B CN201611040898.0A CN201611040898A CN106702049B CN 106702049 B CN106702049 B CN 106702049B CN 201611040898 A CN201611040898 A CN 201611040898A CN 106702049 B CN106702049 B CN 106702049B
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- high temperature
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- 238000000034 method Methods 0.000 title claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000011449 brick Substances 0.000 claims abstract description 77
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 77
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000010936 titanium Substances 0.000 claims abstract description 28
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 28
- 239000008188 pellet Substances 0.000 claims abstract description 18
- 239000000498 cooling water Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 16
- 230000004907 flux Effects 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 40
- 229910052742 iron Inorganic materials 0.000 description 20
- 238000001816 cooling Methods 0.000 description 17
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000008234 soft water Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention provides a method and a device for maintaining a hearth, wherein the method comprises the following steps: controlling the temperature of cooling water at the position of the high-temperature point of the hearth to be 20-30 ℃; controlling the mass percent of sintered ore, pellet ore and raw ore in the blast furnace raw material of the hearth to be 64-66%, 25-30% and 4-10%; controlling the residual thickness of the carbon bricks at the high-temperature point of the hearth to be not less than 700 mm; therefore, by monitoring the temperature change at the position of the high-temperature point in real time, when the temperature exceeds 300 ℃, the high-temperature point is locally and forcibly cooled, and the thickness of the carbon brick of the hearth is ensured to be more than the safe thickness; when the titanium ball is used for protecting the furnace, the low titanium ball TiO in the pellet ore2The mass percentage of the slag is 1.1-1.3%, the grade of the slag entering the furnace is ensured, and the influence on the furnace condition is reduced to the minimum; finally, when the furnace hearth has a high temperature point, the potential safety hazard is solved, the normal and stable production of the blast furnace is ensured, the economic benefit is improved, and the service life of the blast furnace is prolonged.
Description
Technical field
The invention belongs to smelt iron field of engineering technology more particularly to a kind of method for safeguarding cupola well.
Background technique
Blast furnace is the essential equipment in ironmaking field, and the service life for extending blast furnace is that sustainable development is walked by iron and steel enterprise
An important measure, not only in Iron-smelting itself, but also huge effect can be brought to entire integrated iron and steel works, including
Reduce production cost, reduce energy consumption, reduce pollutant emission etc., the high-efficiency reforms of integrated iron and steel works, serialization and
Densification production is just able to continue and carry out.
Especially after blast furnace opening several years, locally occurs high temperature dot (temperature reaches 300 DEG C or more) phenomenon for cupola well
Blast furnace for, should guarantee the longevity of blast furnace, solve security risk；The steady production for guaranteeing blast furnace again is realized and is well referred to
Mark completes yield and index task, while also to take into account the cost of furnace cylinder maintenance.Solution in the prior art but cannot be same
When meet more than condition.
Based on this, the present invention provides a kind of method for safeguarding cupola well, to solve the above problem in the prior art.
Summary of the invention
In view of the problems of the existing technology, the embodiment of the invention provides a kind of methods for safeguarding cupola well, existing to solve
Have in technology, when cupola well locally high temperature dot occurs, can not guarantee that blast furnace normal table produces while solving security risk,
The technical issues of causing cupola well to stop production, reducing economic benefit.
The present invention provides a kind of method for safeguarding cupola well, which comprises
Controlling the cooling water temperature at cupola well high temperature dot position is 20~30 DEG C；
The mass percent for controlling sinter in the blast furnace raw material of the cupola well is the quality percentage of 64~66%, pellet
Than being 4~10% for the mass percent of 25~31%, rawore；
The carbon brick residual thickness at the high temperature dot is controlled not less than 700mm.
In above scheme, the pellet is specifically included:
Low titanium ball, mass percent are 28~30%；
High titanium ball, mass percent are 0~1%.
In above scheme, the low titanium ball body includes:
TiO2, mass percent is 1.1~1.3%；
TFe, mass percent 64.5-64.92%；
SiO2, mass percent 2.72-2.97%；
CaO, mass percent 0.437-0.572%；
FeO, mass percent 0.55-1%；
MgO, mass percent 1.55-1.85%；
Al2O3, mass percent 0.62-0.75%.
In above scheme, the high titanium ball body includes:
TiO2, mass percent 12%-14%；
TFe, mass percent 50-51%；
SiO2, mass percent 6-7%；
Al2O3, mass percent 2-3%；
CaO, mass percent 2-2.2%；
MgO, mass percent 1.8-2.0%.
In above scheme, work as Sn+2When < 0, according to formula S=λn*(1150-tn)/q+Sn-1+…S2+S1+S0Described in calculating
Carbon brick residual thickness S at high temperature dot；Wherein, the S1、S2、…Sn、Sn+1、Sn+2For the carbon brick thickness of different thermal coefficients, and Sn
=Sn+1+Sn+2；The λ1、λ2、…λn-1For the thermal coefficient of corresponding carbon brick；λnFor with a thickness of Sn+1The thermal coefficient of carbon brick, λn+1
For with a thickness of Sn+2The thermal coefficient of carbon brick；The tnFor the maximum temperature value at highest warm spot；The Sn+1It is known.
In above scheme, according to formula Sn+2=(1150-tn)/q-(S1/λ1+S2/λ2+...Sn+1/λn)*λn+1Calculate Sn+2
Value.
In above scheme, work as Sn+2When >=0, according to formula S=S0+S1+S2+...Sn+1+Sn+2Calculate carbon at the high temperature dot
Brick residual thickness S.
In above scheme, according to formulaCalculate the heat flux q.
The present invention also provides a kind of device for safeguarding cupola well, described device includes:
First control unit is 20~30 DEG C for controlling the cooling water temperature at cupola well high temperature dot position；
Second control unit, in the blast furnace raw material for controlling the cupola well mass percent of sinter be 64~
66%, the mass percent of pellet is 25~31%, the mass percent of rawore is 4~10%；
Third control unit, for controlling the carbon brick residual thickness at the high temperature dot not less than 700mm.
In above scheme, it is characterised in that the pellet specifically includes:
Low titanium ball, mass percent are 28~30%；
High titanium ball, mass percent are 0~1%.
The present invention provides a kind of method and devices for safeguarding cupola well, which comprises controls the cupola well high temperature dot
Cooling water temperature at position is 20~30 DEG C；Control sinter in the blast furnace raw material of the cupola well mass percent be 64~
66%, the mass percent of pellet is 25~31%, the mass percent of rawore is 4~10%；It controls at the high temperature dot
Carbon brick thickness be not less than 700mm；In this way, by the temperature change at real-time monitoring high temperature dot position, when temperature is more than 300 DEG C
When, it is strong cold to high temperature dot progress part, guarantee that the carbon brick thickness of cupola well is in safe thickness or more；When carrying out furnace retaining using titanium,
Due to the low titanium ball TiO in the pellet2Mass percent be 1.1~1.3%, ensure that feed grade, will be to the working of a furnace
Influence be preferably minimized；Finally, when high temperature dot occurs in cupola well, guarantee that blast furnace normal table is raw while solving security risk
It produces, improves economic benefit, and extend the service life of blast furnace.
Detailed description of the invention
Fig. 1 is the method flow schematic diagram for the maintenance cupola well that the embodiment of the present invention one provides；
Fig. 2 is the overall structure diagram of maintenance cupola well provided by Embodiment 2 of the present invention.
Specific embodiment
When cupola well locally high temperature dot occurs, in order to guarantee that blast furnace normal table is raw while solving security risk
It produces, the present invention provides a kind of method and devices for safeguarding cupola well, which comprises controls at cupola well high temperature dot position
Cooling water temperature be 20~30 DEG C；Control sinter in the blast furnace raw material in the cupola well mass percent be 64~
66%, the mass percent of pellet is 25~31%, the mass percent of rawore is 4~10%；It controls at the high temperature dot
Carbon brick thickness be not less than 700mm.
Technical solution of the present invention is described in further detail below by drawings and the specific embodiments.
Embodiment one
The present embodiment provides a kind of methods for safeguarding cupola well, as shown in Figure 1, the described method comprises the following steps:
Step 110, controlling the cooling water temperature at cupola well high temperature dot position is 20~30 DEG C.
In this step, at the position that cupola well locally high temperature dot occurs, 6~10 cooling water pipes are chosen, by cooling water
The soft water cooling of pipe is replaced into industry water cooling, and in general, industrial coolant-temperature gage is 20~30 DEG C.
Here it is possible to temperature sensor is set at the high temperature dot position of cupola well, the temperature of high temperature dot described in real-time monitoring,
And degree of cooling is sent to upper computer control system.When temperature sensor monitors that the temperature of high temperature dot is more than 300 DEG C, control system
System sends control instruction control coolant valve and opens, and it is strong cold to carry out part to high temperature dot.
Certainly, here, cooling pipe can also be increased at cupola well high temperature dot, it is strong cold to carry out part to high temperature dot.
Step 111, the mass percent for controlling sinter in the blast furnace raw material of the cupola well is 64~66%, pellet
Mass percent is 25~31%, the mass percent of rawore is 4~10%.
It, can be in feed stock for blast furnace for a long time with addition of titaniferous furnace charge, tool in order to further be protected to blast furnace in this step
Body, in every batch of furnace charge, the mass percent for controlling sinter in the cupola well is 64~66%, it is therefore preferable to 65%, ball
The mass percent of nodulizing is 25~31%, it is therefore preferable to 30%, the mass percent of rawore be 4~10%, it is therefore preferable to
5%；Wherein, the pellet specifically includes: low titanium ball, and mass percent is 28~30%, it is therefore preferable to 29.4%；Gao Tai
Ball, mass percent are 0~1%, it is therefore preferable to 0.6%.
The low titanium ball body includes: TiO2, mass percent is 1.1~1.3%；TFe, mass percent are
64.5-64.92%；SiO2, mass percent 2.72-2.97%；CaO, mass percent 0.437-0.572%；
FeO, mass percent 0.55-1%；MgO, mass percent 1.55-1.85%；Al2O3, mass percent is
0.62-0.75%；Remaining is impurity.
The high titanium ball body includes: TiO2, mass percent 12%-14%；TFe, mass percent 50-
51%；SiO2, mass percent 6-7%；Al2O3, mass percent 2-3%；CaO, mass percent 2-
2.2%；MgO, mass percent 1.8-2.0%；Remaining is impurity.
Step 112, the carbon brick residual thickness at the high temperature dot is controlled not less than 700mm.
In this step, by the monitoring temperature obtained in step 110, it is surplus that the carbon brick at high temperature dot is calculated using formula (1)
Remaining thickness, with energy real-time monitoring carbon brick thickness, can control the carbon brick thickness at the high temperature dot not less than 700mm.
Wherein, in formula (1), q is heat flux, the S1、S2、…Sn、Sn+1、Sn+2For the carbon brick of different thermal coefficients
Thickness, and Sn=Sn+1+Sn+2；The λ1、λ2、…λn- 1 is the thermal coefficient of corresponding carbon brick；λnFor with a thickness of Sn+1Carbon brick it is thermally conductive
Coefficient, λn+1For with a thickness of Sn+2The thermal coefficient of carbon brick；The tnFor the maximum temperature value at highest warm spot；The Sn+1It is known.
Specifically, q value can be calculated using adjacent two o'clock temperature in one-dimensional direction, detects and obtains in recycling blast furnace
Highest point temperature at maximum temperature value tn, 1150 DEG C of molten iron thermoisopleths (i.e. outermost point liquid phase line of solidification), to calculate cupola well
Carbon brick residual thickness (S0+S1+S2+…Sn), guarantee remaining carbon brick thickness in 700mm or more.
Specifically, it is assumed that n temperature detector of insertion of the different depth in the same direction of blast furnace, the temperature inspection
The temperature for surveying device is respectively t1、t2……tn, wherein tnThe insertion distance of temperature highest, corresponding temperature detector is most deep.With it is cold
But wall is opposite for 1150 DEG C of molten iron thermoisopleths, is laid with carbon brick between cooling wall and 1150 DEG C of molten iron thermoisopleths, wherein t1It is right
Hot identity distance of the temperature detector answered apart from cooling wall is from for S0, t1With t2Between carbon brick thermal coefficient be λ1, t1With t2Between
Distance is S1；t2Corresponding temperature detector and t3Carbon brick thermal coefficient between corresponding temperature detector is λ2, t2It is corresponding
Temperature detector and t3The distance between corresponding temperature detector S2；tnThe distance between 1150 DEG C of molten iron thermoisopleths are Sn
(Sn=Sn+1+Sn+2), wherein SnCarbon brick S including two kinds of different thermal coefficientsn+1And Sn+2；With a thickness of Sn+1The thermally conductive system of carbon brick
Number is λn, with a thickness of Sn+2The thermal coefficient of carbon brick is λn+1.The above parameter, temperature unit DEG C, parasang m, in addition to SnAnd Sn+2
Except, remaining is known conditions.
So t can be calculated according to formula (1)1With tnBetween heat flux q, then according to formula (2) calculate Sn+2:
Sn+2=(1150-tn)/q-(S1/λ1+S2/λ2+...Sn+1/λn)*λn+1 (2)
Wherein, work as Sn+2When < 0, carbon brick residual thickness S at the high temperature dot is calculated according to formula (3):
S=λn*(1150-tn)/q+Sn-1+…S2+S1+S0 (3)
Work as Sn+2When >=0, carbon brick residual thickness S at the high temperature dot is calculated according to formula (4).
S=S0+S1+S2+...Sn+1+Sn+2 (4)
Such as: assuming that three temperature detectors of the insertion of the different depth in the same direction of blast furnace, the temperature inspection
The temperature for surveying device is respectively t1、t2、t3, wherein t3The insertion distance of temperature highest, corresponding temperature detector is most deep.With cooling
Wall is opposite for 1150 DEG C of molten iron thermoisopleths, is laid with carbon brick between cooling wall and 1150 DEG C of molten iron thermoisopleths, wherein t1It is corresponding
Hot identity distance of the temperature detector apart from cooling wall from for S0, t1With t2Between carbon brick thermal coefficient be λ1, t1With t2Spacing
From for S1；t2Corresponding temperature detector and t3Carbon brick thermal coefficient between corresponding temperature detector is λ2, t2Corresponding temperature
Spend detector and t3The distance between corresponding temperature detector S2；t3The distance between 1150 DEG C of molten iron thermoisopleths are S3(S3
=S4+S5), wherein S3Carbon brick S including two kinds of different thermal coefficients4And S5；With a thickness of S4The thermal coefficient of carbon brick is λ3, thick
Degree is S5The thermal coefficient of carbon brick is λ4.The above parameter, temperature unit DEG C, parasang m, in addition to S3And S5Except, remaining is
Known conditions.
So t1 and t can be calculated according to formula (1)2Between heat flux q, then according to formula (2) calculate S5:
S5=(1150-t3)/q-(S1/λ1+S2/λ2+S4/λ3)*λ4
If S5< 0, then cupola well carbon brick residual thickness is calculated according to formula (3) herein:
S=λ3*(1150-t3)/q+S2+S1+S0
If S5>=0, then cupola well carbon brick residual thickness is calculated according to formula (4) herein:
S=S0+S2+S1+S4+S5
Finally, it is also to be ensured that the quality of furnace charge, to stablize the coal gas in smelting process；And the preferable stemming of quality is used,
Guarantee that fire door depth qualification rate 95% or more, reduces the erosion of molten iron circulation, protects fire door.
The method of maintenance cupola well provided in this embodiment works as temperature by the temperature change at real-time monitoring high temperature dot position
It is strong cold to high temperature dot progress part when degree is more than 300 DEG C, guarantee that the carbon brick thickness of cupola well is in safe thickness or more；Utilize titanium
When carrying out furnace retaining, due to the low titanium ball TiO in the pellet2Mass percent be 1.1~1.3%, ensure that into furnace product
Position, will be preferably minimized the influence of the working of a furnace；Finally, when high temperature dot occurs in cupola well, guarantee while solving security risk high
The production of furnace normal table, improves economic benefit, and extend the service life of blast furnace.
Embodiment two
Corresponding to embodiment one, the present embodiment provides a kind of devices for safeguarding cupola well, as shown in Fig. 2, described device includes:
First control unit 21, the second control unit 22 and third control unit 23；Wherein,
It is 20~30 DEG C that the first control unit 21, which is used to control the cooling water temperature at cupola well high temperature dot position,；
Specifically, at the position that cupola well locally high temperature dot occurs, 6~10 cooling water pipes are chosen, the soft water of cooling water pipe is cold
But it is cooling to be replaced into industry water, in general, industrial coolant-temperature gage is 20~30 DEG C.
Here it is possible to temperature sensor is set at the high temperature dot position of cupola well, the temperature of high temperature dot described in real-time monitoring,
And degree of cooling is sent to first control unit 21.When temperature sensor monitors that the temperature of high temperature dot is more than 300 DEG C, the first control
Unit 21 processed sends control instruction control coolant valve and opens, and it is strong cold to carry out part to high temperature dot.
Certainly, here, cooling pipe can also be increased at cupola well high temperature dot, it is strong cold to carry out part to high temperature dot.
Second control unit 22 be used to control the mass percent of sinter in the blast furnace raw material of the cupola well be 64~
66%, it is therefore preferable to 65%, the mass percent of pellet be 25~31%, it is therefore preferable to 30%, the mass percent of rawore
It is 4~10%, it is therefore preferable to 5%；Specifically, in order to further be protected to blast furnace, the furnace charge in blast furnace can be carried out
Add titanium for a long time, here, in every batch of furnace charge, second control unit 22 controls the mass percent of sinter in the cupola well
Be 64~66%, it is therefore preferable to 65%, the mass percent of pellet be 25~31%, it is therefore preferable to 30%, the quality of rawore
Percentage is 4~10%, it is therefore preferable to 5%；Wherein, the pellet specifically includes: low titanium ball, mass percent be 28~
30%, it is therefore preferable to 29.4%；High titanium ball, mass percent are 0~1%, it is therefore preferable to 0.6%.
The low titanium ball body includes: TiO2, mass percent is 1.1~1.3%；TFe, mass percent are
64.5-64.92%；SiO2, mass percent 2.72-2.97%；CaO, mass percent 0.437-0.572%；
FeO, mass percent 0.55-1%；MgO, mass percent 1.55-1.85%；Al2O3, mass percent is
0.62-0.75%；Remaining is impurity.
The high titanium ball body includes: TiO2, mass percent 12%-14%；TFe, mass percent 50-
51%；SiO2, mass percent 6-7%；Al2O3, mass percent 2-3%；CaO, mass percent 2-
2.2%；MgO, mass percent 1.8-2.0%；Remaining is impurity.
Third control unit 23 is used to control the carbon brick thickness at the high temperature dot not less than 700mm；Specifically, pass through step
The monitoring temperature obtained in rapid 110 calculates the carbon brick residual thickness at high temperature dot using formula (1), with energy real-time monitoring carbon brick
Thickness, can control the carbon brick thickness at the high temperature dot not less than 700mm.
Wherein, in formula (1), q is heat flux, the S1、S2、…Sn、Sn+1、Sn+2For the carbon brick of different thermal coefficients
Thickness, and Sn=Sn+1+Sn+2；The λ1、λ2、…λn- 1 is the thermal coefficient of corresponding carbon brick；λnFor with a thickness of Sn+1Carbon brick it is thermally conductive
Coefficient, λn+1For with a thickness of Sn+2The thermal coefficient of carbon brick；The tnFor the maximum temperature value at highest warm spot；The Sn+1It is known.
Specifically, q value can be calculated using adjacent two o'clock temperature in one-dimensional direction, detects and obtains in recycling blast furnace
Highest point temperature at maximum temperature value tn, 1150 DEG C of molten iron thermoisopleths (i.e. outermost point liquid phase line of solidification), to calculate cupola well
Carbon brick residual thickness (S0+S1+S2+…Sn), guarantee remaining carbon brick thickness in 700mm or more.
Specifically, it is assumed that n temperature detector of insertion of the different depth in the same direction of blast furnace, the temperature inspection
The temperature for surveying device is respectively t1、t2……tn, wherein tnThe insertion distance of temperature highest, corresponding temperature detector is most deep.With it is cold
But wall is opposite for 1150 DEG C of molten iron thermoisopleths, is laid with carbon brick between cooling wall and 1150 DEG C of molten iron thermoisopleths, wherein t1It is right
Hot identity distance of the temperature detector answered apart from cooling wall is from for S0, t1With t2Between carbon brick thermal coefficient be λ1, t1With t2Between
Distance is S1；t2Corresponding temperature detector and t3Carbon brick thermal coefficient between corresponding temperature detector is λ2, t2It is corresponding
Temperature detector and t3The distance between corresponding temperature detector S2；tnThe distance between 1150 DEG C of molten iron thermoisopleths are Sn
(Sn=Sn+1+Sn+2), wherein SnCarbon brick S including two kinds of different thermal coefficientsn+1And Sn+2；With a thickness of Sn+1The thermally conductive system of carbon brick
Number is λn, with a thickness of Sn+2The thermal coefficient of carbon brick is λn+1.The above parameter, temperature unit DEG C, parasang m, in addition to SnAnd Sn+2
Except, remaining is known conditions.
So t can be calculated according to formula (1)1With tnBetween heat flux q, then according to formula (2) calculate Sn+2:
Sn+2=(1150-tn)/q-(S1/λ1+S2/λ2+...Sn+1/λn)*λn+1 (2)
Wherein, work as Sn+2When < 0, carbon brick residual thickness S at the high temperature dot is calculated according to formula (3):
S=λn*(1150-tn)/q+Sn-1+…S2+S1+S0 (3)
Work as Sn+When 2 >=0, carbon brick residual thickness S at the high temperature dot is calculated according to formula (4).
S=S0+S1+S2+...Sn+1+Sn+2 (4)
Such as: assuming that three temperature detectors of the insertion of the different depth in the same direction of blast furnace, the temperature inspection
The temperature for surveying device is respectively t1、t2、t3, wherein t3The insertion distance of temperature highest, temperature detector is most deep.It is opposite with cooling wall
It is 1150 DEG C of molten iron thermoisopleths, is laid with carbon brick between cooling wall and 1150 DEG C of molten iron thermoisopleths, wherein t1Corresponding temperature
The hot identity distance of detector distance cooling wall is from for S0, t1With t2Between carbon brick thermal coefficient be λ1, t1With t2Between distance be S1；
t2Corresponding temperature detector and t3Carbon brick thermal coefficient between corresponding temperature detector is λ2, t2Corresponding temperature detection
Device and t3The distance between corresponding temperature detector S2；t3The distance between 1150 DEG C of molten iron thermoisopleths are S3(S3=S4+
S5), wherein S3Carbon brick S including two kinds of different thermal coefficients4And S5；With a thickness of S4The thermal coefficient of carbon brick is λ3, with a thickness of S5
The thermal coefficient of carbon brick is λ4.The above parameter, temperature unit DEG C, parasang m, in addition to S3And S5Except, remaining is known item
Part.
Therefore t can be calculated according to formula (1)1With t2Between heat flux q, then according to formula (2) calculate S5:
S5=(1150-t3)/q-(S1/λ1+S2/λ2+S4/λ3)*λ4
If S5< 0, then cupola well carbon brick residual thickness is calculated according to formula (3) herein:
S=λ3*(1150-t3)/q+S2+S1+S0
If S5>=0, then cupola well carbon brick residual thickness is calculated according to formula (4) herein:
S=S0+S2+S1+S4+S5
Finally, it is also to be ensured that the quality of furnace charge, to stablize the coal gas in smelting process；And the preferable stemming of quality is used,
Guarantee that fire door depth qualification rate 95% or more, reduces the erosion of molten iron circulation, protects fire door.
In practical application, the first control unit 21, the second control unit 22 and third control unit 23 can be by the dresses
Central processing unit (CPU, Central Processing Unit), digital signal processor (DSP, Digtal in setting
Signal Processor), programmable logic array (FPGA, FieldProgrammable GateArray), micro-control unit
(MCU, Micro ControllerUnit) is realized.
The method of maintenance cupola well provided in this embodiment works as temperature by the temperature change at real-time monitoring high temperature dot position
It is strong cold to high temperature dot progress part when degree is more than 300 DEG C, guarantee that the carbon brick thickness of cupola well is in safe thickness or more；Utilize titanium
When carrying out furnace retaining, due to the low titanium ball TiO in the pellet2Mass percent be 1.1~1.3%, ensure that into furnace product
Position, will be preferably minimized the influence of the working of a furnace；Finally, when high temperature dot occurs in cupola well, guarantee while solving security risk high
The production of furnace normal table, improves economic benefit, and extend the service life of blast furnace.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention, it is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention, should be included in protection of the invention
Within the scope of.
Claims (7)
1. a kind of method for safeguarding cupola well, which is characterized in that the described method includes:
Controlling the cooling water temperature at cupola well high temperature dot position is 20~30 DEG C；
The mass percent for controlling sinter in the blast furnace raw material of the cupola well is 64~66%, the mass percent of pellet is
25~30%, the mass percent of rawore is 4~10%, and the pellet includes: low titanium ball and high titanium ball；
The carbon brick residual thickness at the high temperature dot is controlled not less than 700mm；Wherein,
The low titanium ball body includes:
TiO2, mass percent is 1.1~1.3%；
TFe, mass percent 64.5-64.92%；
SiO2, mass percent 2.72-2.97%；
CaO, mass percent 0.437-0.572%；
FeO, mass percent 0.55-1%；
MgO, mass percent 1.55-1.85%；
Al2O3, mass percent 0.62-0.75%.
2. the method as described in claim 1, which is characterized in that
Low titanium ball, mass percent are 25~28%；
High titanium ball, mass percent are 0~2%.
3. method according to claim 2, which is characterized in that the high titanium ball body includes:
TiO2, mass percent 12%-14%；
TFe, mass percent 50-51%；
SiO2, mass percent 6-7%；
Al2O3, mass percent 2-3%；
CaO, mass percent 2-2.2%；
MgO, mass percent 1.8-2.0%.
4. the method as described in claim 1, which is characterized in that control the carbon brick residual thickness at the high temperature dot and be not less than
700mm is specifically included:
Carbon brick residual thickness at the high temperature dot is S0+S1+S2+…Sn, wherein SnCarbon brick including two kinds of different thermal coefficients
Sn+1And Sn+2, as the Sn+2When < 0, according to formula S=λn*(1150-tn)/q+Sn-1+…S2+S1+S0Calculate the high temperature dot
The carbon brick residual thickness S at place；
Wherein, the S1、S2、…Sn、Sn+1、Sn+2For the carbon brick thickness of different thermal coefficients, and Sn=Sn+1+Sn+2；It is described in formula
λnFor with a thickness of Sn+1The thermal coefficient of carbon brick；The tnFor the maximum temperature value at highest warm spot；The Sn+1It is known；The q is
Heat flux.
5. method as claimed in claim 4, which is characterized in that according to formula Sn+2=(1150-tn)/q-(S1/λ1+S2/λ2
+...Sn+1/λn)*λn+1Calculate Sn+2Value, wherein the λ1、λ2、…λnFor the thermal coefficient of corresponding carbon brick；The λn+1For thickness
Degree is Sn+2The thermal coefficient of carbon brick.
6. method as claimed in claim 5, which is characterized in that work as Sn+2When >=0, according to formula S=S0+S1+S2+...Sn+1+
Sn+2Calculate carbon brick residual thickness S at the high temperature dot.
7. method as claimed in claim 5, which is characterized in that according to formulaCalculate the heat flux q.
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| CN109266800A (en) * | 2018-11-09 | 2019-01-25 | 唐山钢铁集团有限责任公司 | Brick fuel and ceramic-lined Thickness Design Method in blast furnace crucibe masonry |
| CN110781566B (en) * | 2019-10-21 | 2023-06-27 | 中冶赛迪信息技术(重庆)有限公司 | Hearth iron solidification layer calculation method, hearth iron solidification layer calculation system, storage medium and electronic terminal |
| CN112410485B (en) * | 2020-11-19 | 2021-07-20 | 福建三宝钢铁有限公司 | Low-titanium furnace protection process for blast furnace |
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| CN101275829A (en) * | 2007-03-29 | 2008-10-01 | 上海梅山钢铁股份有限公司 | Method for measuring blast furnace lining corroding thickness |
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