CN114410859B - Diagnosis and treatment method for stacking furnace cores of medium-sized blast furnaces - Google Patents
Diagnosis and treatment method for stacking furnace cores of medium-sized blast furnaces Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000003745 diagnosis Methods 0.000 title abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 96
- 229910052742 iron Inorganic materials 0.000 claims abstract description 48
- 239000002893 slag Substances 0.000 claims abstract description 28
- 239000003245 coal Substances 0.000 claims abstract description 26
- 238000009825 accumulation Methods 0.000 claims abstract description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 16
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 15
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000009471 action Effects 0.000 claims abstract description 11
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000000571 coke Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 11
- 230000007423 decrease Effects 0.000 abstract description 10
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 9
- 238000010791 quenching Methods 0.000 description 9
- 230000000171 quenching effect Effects 0.000 description 8
- 238000000605 extraction Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
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- 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
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention provides a diagnosis and treatment method for stacking furnace cores of a medium-sized blast furnace, which comprises the following steps: judging whether the blast furnace condition meets preset conditions or not; when the preset conditions are met, judging that the furnace core accumulation exists in the blast furnace, and increasing the duty ratio of a convolution zone, the molten iron temperature of the blast furnace and the ratio of magnesium oxide to aluminum oxide in slag; wherein, the preset conditions include: the furnace core temperature in the center of the blast furnace continuously decreases for more than 15 days and decreases to below a temperature threshold T0; and the C content in the blast furnace molten iron is reduced to a preset content wt C The frequency below 0 reaches the preset frequency P0; and the coal lifting action time reaches a preset time t0. The invention can help blast furnace operators to quickly diagnose the working state of the blast furnace hearth, promote the replacement of the coke of the hearth by adopting a series of control measures, improve the activity of the hearth, eliminate the accumulation of the furnace core, and save the treatment cost of the accumulation of the furnace core without using a furnace washing agent.
Description
Technical Field
The invention belongs to the technical field of smelting blast furnace control, and relates to a diagnosis and treatment method for furnace core accumulation of a medium-sized blast furnace.
Background
With the increase of environmental awareness, the national environmental protection and production limiting policies are more and more strict, the self-produced coke supply of each large steel factory is insufficient, and a large amount of coke is required to be purchased outsourced, wherein wet quenching is not used; in addition, the dry quenching equipment needs to be overhauled after being used for a period of time, and during the annual repair period of the dry quenching equipment, each large steel mill can adopt wet quenching equipment to quench coke, so that the blast furnace needs to be matched with a certain proportion of wet quenching coke to ensure the normal production of the blast furnace.
However, long-term use of wet quenching in a blast furnace can cause stack of furnace cores of the blast furnace, and economic indexes of the blast furnace, such as yield of the blast furnace, fuel ratio and production cost, are reduced, so that huge losses are caused to the blast furnace. Therefore, how to rapidly judge whether the furnace core is piled up and rapidly treat the furnace core is a long-standing research hot spot in the field of blast furnace ironmaking.
Disclosure of Invention
The invention aims to provide a diagnosis and treatment method for furnace core accumulation of a medium-sized blast furnace, which solves the problem that whether the furnace core accumulation occurs and the treatment is fast can not be rapidly diagnosed in the prior art.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for diagnosing and treating a stack of furnace cores of a medium-sized blast furnace, comprising the steps of,
judging whether the blast furnace condition meets preset conditions or not;
when the preset conditions are met, judging that the furnace core accumulation exists in the blast furnace, and increasing the duty ratio of a convolution zone, the molten iron temperature of the blast furnace and the ratio of magnesium oxide to aluminum oxide in slag;
wherein, the preset conditions include: the furnace core temperature in the center of the blast furnace continuously decreases for more than 15 days and decreases to below a temperature threshold T0; and the C content in the blast furnace molten iron is reduced to a preset content wt C The frequency below 0 reaches the preset frequency P0; and the coal lifting action time reaches a preset time t0.
As a further improvement of an embodiment of the present invention, the step of "increasing the swirl zone ratio" specifically includes reducing the tuyere area and increasing the wind pressure.
As a further improvement of one embodiment of the present invention, the step of "increasing the convolution area ratio" specifically includes increasing the convolution area ratio to 0.5 and above.
As a further improvement of an embodiment of the present invention, the step of "increasing the temperature of the molten iron of the blast furnace" specifically includes increasing the temperature of the molten iron of the blast furnace to 1500 ℃ or higher.
As a further improvement of one embodiment of the present invention, the step of "increasing the ratio of magnesium oxide to aluminum oxide in the slag" specifically includes adding serpentine to the blast furnace burden.
As a further improvement of one embodiment of the present invention, the step of "increasing the ratio of magnesium oxide to aluminum oxide in the slag" specifically includes increasing the ratio of magnesium oxide to aluminum oxide in the slag to 0.60 or more.
As a further improvement of an embodiment of the present invention, the temperature threshold T0 is 400 ℃.
As a further improvement of an embodiment of the invention, the preset content wt of C in the blast furnace molten iron C 0 is 5%.
As a further improvement of an embodiment of the present invention, the preset frequency P0 is 5 times/day.
As a further improvement of an embodiment of the present invention, the preset time t0 of the coal lifting action is 3h.
Compared with the prior art, the invention has the beneficial effects that: the diagnosis and treatment method for the stack of the furnace core of the medium-sized blast furnace can help blast furnace operators to quickly diagnose the working state of the furnace core of the blast furnace through preset conditions, discover and treat the working state of the furnace core as soon as possible, enable the blast furnace to recover productivity as soon as possible, avoid the extra increase of production cost, promote the replacement of coke in the furnace core, improve the activity of the furnace core, ensure the C content in molten iron, improve the fluidity of the furnace slag in a low-temperature area in the blast furnace, ensure the net yield of the furnace slag, further eliminate the stack of the furnace core, eliminate the use of a furnace washing agent and save the stack treatment cost of the furnace core.
Drawings
FIG. 1 is a graph showing the number of times the C content in the molten iron of the blast furnace of an embodiment of the present invention is less than 5% with time;
FIG. 2 is a graph showing the change of the temperature of a blast furnace core with time according to an embodiment of the present invention;
FIG. 3 is a graph showing the Si content after coal extraction in the case of the forward running of the blast furnace according to an embodiment of the present invention;
FIG. 4 is a graph showing the change in Si content after coal extraction in the case of stacking of cores of a blast furnace according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the invention and structural, methodological, or functional modifications of these embodiments that may be made by one of ordinary skill in the art are included within the scope of the invention.
The invention provides a diagnosis and treatment method which can be particularly used for diagnosing and treating furnace core accumulation in a medium-sized blast furnace so as to discover the occurrence of abnormal furnace conditions of the furnace core accumulation as soon as possible and treat the furnace core accumulation by adopting effective measures in time so as not to influence the smooth running of the blast furnace.
The steps of a preferred embodiment of the method for diagnosing and treating the stack of the medium-sized blast furnace core will be described below.
The steps are as follows: judging whether the blast furnace condition meets the preset condition.
The preset conditions include: the furnace core temperature in the center of the blast furnace continuously decreases for more than 15 days and decreases to below a temperature threshold T0; and the C content in the blast furnace molten iron is reduced to a preset content wt C The frequency below 0 reaches the preset frequency P0; and the coal lifting action time reaches a preset time t0.
Under the condition that the blast furnace is running forward, the temperature of the furnace core in the center of the blast furnace shows small fluctuation, and the temperature of the furnace core can be kept above a temperature threshold T0; and the C content in the molten iron of the blast furnace is kept at a preset content weight C The content of C is within a preset content weight C The frequency below 0 is less than the preset frequency P0; and the time of coal extraction is t1, wherein t1<The preset time t0, that is, when the furnace temperature of the blast furnace is lowered while the blast furnace is running, after the pulverized coal (i.e. "coal lifting") is increased, the action time (i.e. the interval time from the increase of the pulverized coal to the start of the rise of the furnace temperature) t1 elapsesThe furnace temperature will return to the original state.
By comprehensively analyzing and diagnosing different factors of the blast furnace conditions, when the blast furnace conditions simultaneously meet the following conditions: continuously reducing the temperature of the furnace core in the center of the blast furnace, wherein the duration time is more than 15 days, and the temperature of the furnace core is reduced to be below a temperature threshold T0; the C content in the molten iron of the blast furnace is reduced to the preset content wt C The frequency below 0 reaches the preset frequency P0; and if the coal lifting action time reaches the preset time t0 or more, indicating that the furnace condition of the blast furnace is abnormal, and judging that the furnace core accumulation exists in the blast furnace. The diagnosis mode can help blast furnace operators to diagnose the working state of the blast furnace hearth simply and intuitively, discover and treat the working state as early as possible, so that the blast furnace recovers productivity as early as possible, and the extra increase of the production cost is avoided.
The steps are as follows: and when the preset conditions are met, judging that the furnace core accumulation exists in the blast furnace, and increasing the duty ratio of a convolution zone, the molten iron temperature of the blast furnace and the ratio of magnesium oxide to aluminum oxide in slag.
Through the diagnosis, when the preset condition is met, the furnace core accumulation of the blast furnace is judged, at the moment, the swirl zone is increased to enable the combustion zone to extend towards the center, so that the edge airflow and the development center airflow are restrained, the continuous drop of the furnace core temperature is restrained, the furnace core temperature is raised, the furnace core temperature is kept above the temperature threshold T0, the replacement of furnace hearth coke can be promoted, and the furnace hearth activity is improved; the reduction reaction rate of C in the blast furnace can be increased by increasing the temperature of the molten iron of the blast furnace so that the content of C in the molten iron meets the requirement of the preset content weight C The frequency below 0 is less than the preset frequency P0, so that the C saturation of molten iron in a hearth is improved, and the activity of the hearth is increased; the ratio of magnesium oxide to aluminum oxide in the slag is improved, so that the viscosity of primary slag of the slag is reduced, the dropping rate of molten iron in the slag dropping area is accelerated, the fluidity of the slag in the low-temperature area of the blast furnace can be improved, the net rate of the slag is ensured, and further the accumulation of furnace cores is eliminated; through the series of measures, the problem of stack of the furnace core of the blast furnace can be rapidly solved, the productivity of the blast furnace can be recovered as soon as possible, the extra increase of the production cost is avoided, and the use of washing is not neededThe furnace agent saves the furnace core stacking treatment cost.
The furnace core temperature of the center of the blast furnace is measured in real time through a thermocouple arranged in the center of the blast furnace, wherein the furnace core temperature is the average value of a plurality of temperatures measured by the thermocouple every day.
Further, the step of increasing the convolution area ratio specifically includes reducing the tuyere area and increasing the wind pressure.
Wherein, the swirl zone ratio is the ratio of the area of the combustion zone ring to the area of the hearth, denoted by n, and the calculation formula is as follows:
l＝0.88+0.000092E-0.00031 P C n, wherein E is the blowing kinetic energy, and the unit is kg.m/s; p (P) C The unit is kg/h of the coal quantity in hours; n is the number of the air openings.
The wind speed, the blast air quantity and the blast kinetic energy E can be increased through the area reduction of the wind opening and the increase of the wind pressure, so that the depth of the convolution zone can be advanced to activate the hearth, the duty ratio n of the convolution zone is increased, the center of the blast furnace is opened, the center is better replaced by Jiao Dui, the activity of the hearth is improved, the temperature of the furnace core is improved, the reduction of carbon in molten iron of the blast furnace is increased, the C content in molten iron of the blast furnace is ensured, and the operability and the practicability are strong.
Further, the step of increasing the convolution region duty ratio specifically includes increasing the convolution region duty ratio to 0.5 and above. When the convolution area duty ratio reaches 0.5 and above, the convolution area depth can be increased, taking a medium-sized blast furnace with a furnace capacity of 2680m3 as an example, the hearth diameter is 10.9m, and when the convolution area duty ratio n=0.50, the convolution area depth l=1.596 m; when the convolution area occupies a ratio of n=0.55 and the convolution area depth l= 1.794m, the center of the blast furnace is more favorably opened, the replacement of hearth coke is better promoted, the hearth activity is improved, the temperature of the hearth is improved, the reduction of carbon in the blast furnace molten iron is increased, and the C content in the blast furnace molten iron is ensured.
Further, the step of "increasing the temperature of the molten iron of the blast furnace" specifically includes increasing the temperature of the molten iron of the blast furnace to 1500 ℃ or higher. The carbon in the molten iron of the blast furnace can be fully reduced by increasing the temperature of the molten iron in the blast furnace to be more than 1500 ℃, and the reduction reaction rate of C element in the blast furnace is increased, so that the C content in the molten iron is reduced to the preset content weight C The frequency below 0 is less than the preset frequency P0, so that the C saturation of molten iron in the hearth is improved, and the activity of the hearth is increased.
Further, the step of increasing the ratio of magnesium oxide to aluminum oxide in the slag specifically includes adding serpentine to the blast furnace burden. The main component in serpentine is MgO, and by adding serpentine, the ratio of magnesium oxide to aluminum oxide in slag can be improved, the fluidity of slag in a low-temperature area is improved, the net rate of slag is ensured, and the activity of a furnace core is increased.
Further, the step of increasing the ratio of magnesium oxide to aluminum oxide in the slag specifically includes increasing the ratio of magnesium oxide to aluminum oxide in the slag to 0.60 or more. The ratio of magnesium oxide to aluminum oxide in the slag is increased to 0.60 or above, so that the melting temperature of the slag is reduced to below 1330 ℃, the penetration of the slag in a coke bed and the flow and discharge of the slag to each iron notch are improved, the net yield of the slag is ensured, the cleanliness of a hearth is improved, and the activity of a furnace core is increased.
In this example, the medium-sized blast furnace is used with the furnace core temperature kept at 400-500 c with the blast furnace in forward motion. If the temperature of the blast furnace core continuously decreases and is lower than 400 ℃, the abnormal conditions such as stacking and the like of the blast furnace core are indicated. Therefore, in the present embodiment, the temperature threshold T0 is set to 400 ℃. Of course, in other embodiments, the temperature threshold T0 may be different in size depending on the type and size of the blast furnace.
Further, the preset content wt of C in the blast furnace molten iron C 0 to 5 percent, wherein the saturated C content in the blast furnace molten iron is 5 percent and is in direct proportion to the temperature of the molten iron, and the sufficient contact between the molten iron and the coke can be ensured by keeping the C content in the blast furnace molten iron above 5 percentArea so that the slag iron passes through the dead pile and flows from all directions to the tap hole to be discharged out of the furnace.
Further, the preset frequency P0 is 5 times/day. Under the condition that the blast furnace runs forward, the C content in the molten iron of the blast furnace is kept at the preset content weight C Above 0, only occasional C drops to a preset level of wt C The content of C is reduced to a preset content wt C The frequency of less than 0 is not more than 3 times per day, if the C content is reduced to the preset content wt C The frequency below 0 exceeds 5 times per day, which indicates that the C content in the molten iron is lower than the saturated C content, the contact between the molten iron and coke is poor, the furnace core is piled up in the blast furnace, and the higher the frequency is, the poorer the drainage capacity of the dead pile is.
Further, the preset time t0 of the coal lifting effect is 3h. In this embodiment, the preset time t1<3h. That is, when the furnace temperature of the blast furnace is lowered during forward running of the blast furnace, the furnace temperature of the blast furnace is returned to the original state after 2 to 3 hours of the operation time (i.e., the time interval from the start of increasing the pulverized coal to the start of returning to the furnace temperature) elapses after increasing the pulverized coal (i.e., "coal lifting"). Therefore, after the pulverized coal is added, the furnace temperature of the blast furnace is returned to the original state after the action time exceeds 3 hours, and even the action time exceeds 3 hours, the furnace temperature of the blast furnace is not returned to the original state, and the condition of the blast furnace is abnormal, and the condition of furnace core accumulation is shown.
The following describes the embodiments of the present invention further by way of specific examples.
The medium-sized blast furnace adopted in the embodiment has a furnace capacity of 2680m, and is matched with wet quenching production from 9 months to 15 days due to overhaul of matched 3# dry quenching equipment. Referring to fig. 1, the number of times the C content in the blast furnace molten iron is lower than 5% from day 9, day 15 to day 1, month 20 is recorded, wherein the abscissa indicates the date and the ordinate indicates the number of times the C content in the blast furnace molten iron is lower than 5% per day. It can be seen from fig. 1 that in the first 25 days, that is, in the early stacking stage in fig. 1, the times of C content in the blast furnace molten iron being lower than 5% per day are all less than 5 times, the blast furnace is running forward, and from the 26 th day, the times of C content in the blast furnace molten iron being lower than 5% per day are gradually increased, and the frequency of C content in the blast furnace molten iron being lower than 5% is often higher than 5 times, even up to 9 times, and at this time, the blast furnace enters the furnace core stacking stage.
Meanwhile, referring to fig. 2, there is shown a change in the temperature of the blast furnace core from day 9, day 15 to day 1, month 20, wherein the abscissa is the date and the ordinate is the daily temperature of the blast furnace core. It can be seen from fig. 2 that during the first 25 days, i.e. the early stacking phase in fig. 2, the temperature of the blast furnace core fluctuates between 400 and 500 c, starting from day 26, the temperature of the blast furnace core continuously decreases from 485 c until it falls below 400 c, at which point the blast furnace enters the core stacking phase.
Referring to fig. 3 and 4, fig. 3 shows the change of Si content after coal extraction for 9 months and 20 days, while fig. 4 shows the change of Si content after coal extraction for 11 months and 20 days, wherein the horizontal axis is time, the left vertical axis is Si content, and the right vertical axis is coal amount. In a blast furnace, an increase in Si content means an increase in the furnace temperature of the blast furnace, and a decrease in Si content means a decrease in the furnace temperature of the blast furnace. Comparing fig. 3 and fig. 4, it can be seen that in the case of the forward running of the blast furnace in fig. 3, after coal extraction, i.e., after coal addition, the Si content starts to rise after 2 to 3 hours, whereas in fig. 4, after coal addition, the Si content starts to rise after 8 hours, meaning that the furnace core is piled up.
Referring to fig. 1 to 4, from day 26, the conditions that the C content in the molten iron of the blast furnace is lower than 5% and reaches more than 5 times, the temperature of the furnace core of the blast furnace is continuously reduced to be lower than 400 ℃, and the coal lifting action time is increased from 2 to 3 hours to more than 8 hours are simultaneously occurred, and the condition that the Si content is raised back is judged to occur.
Next, referring to table 1, a series of regulation measures were taken for the core stacking condition, including: the tuyere area is adjusted from 0.3481m 2 Gradually shrink to 0.3383m 2 The wind pressure is increased from 376Kpa to 396Kpa, the wind quantity is increased from 4660Nm/min to 4900Nm/min, the actual wind speed is increased from 250m/s to 259m/s, and the blowing kinetic energy is increased from 11522kg m/s to 13066kg m/s, the convolution area ratio is increased from 0.48 to 0.52, the temperature of molten iron is increased to more than 1500 ℃, serpentine is added, and the ratio of magnesium oxide to aluminum oxide is increased from 0.53 to 0.60. After the above measures are adjusted, the following are found in conjunction with fig. 1 and 2 and table 2: the number of times of C content in the blast furnace molten iron is lower than 5 percent every day is reduced to below 5 times, the temperature of the blast furnace core is increased to more than 441 ℃ from 379 ℃, and fluctuates between 400 ℃ and 500 ℃, the number of times of the accumulated molten iron temperature less than 1500 ℃ every day is obviously reduced to about 4.2 from about 10.8 times on average, the fuel ratio is gradually reduced to 533.8kg/t on average from the level of 549.5kg/t on average, and the yield is also increased to 6848 t/day from 6393 t/day; the action time of the coal extraction is recovered to be normal for 2-3 hours, and the activity of the hearth is gradually improved.
TABLE 1
| Time | Tuyere area | Air volume | Wind pressure | Jacking and pressing | Oxygen enrichment | Actual wind speed | Kinetic energy of blasting |
| 2020.10 | 0.3481 | 4660 | 376 | 209 | 17885 | 250 | 11522 |
| 2020.11 | 0.3442 | 4780 | 380 | 210 | 16713 | 257 | 12501 |
| 2020.12 | 0.3402 | 4870 | 390 | 214 | 17691 | 259 | 12991 |
| 2021.01 | 0.3383 | 4900 | 396 | 218 | 19204 | 259 | 13066 |
TABLE 2
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (3)
1. A method for diagnosing and treating the stack of furnace cores of a medium-sized blast furnace is characterized by comprising the steps of,
judging whether the blast furnace condition meets preset conditions or not;
when the preset conditions are met, judging that the furnace core accumulation exists in the blast furnace, and increasing the rotating area ratio to 0.5 or more, increasing the temperature of molten iron of the blast furnace to 1500 ℃ or more, and increasing the ratio of magnesium oxide to aluminum oxide in slag to 0.60 or more;
wherein, the preset conditions include: continuously reducing the temperature of a furnace core in the center of the blast furnace for more than 15 continuous days and reducing the temperature to below a temperature threshold T0, wherein the temperature threshold T0 is 400 ℃; and the C content in the blast furnace molten iron is reduced to a preset content wt C The frequency below 0 reaches the preset frequency P0, and the preset content wt C 0 is 5%, and the preset frequency P0 is 5 times/day; and the coal lifting action time reaches a preset time t0, wherein the preset time t0 is 3h.
2. The method for diagnosing and treating a stack of a medium-sized blast furnace core according to claim 1, wherein said step of increasing the swirling area ratio comprises specifically decreasing the tuyere area and increasing the wind pressure.
3. The method for diagnosing and treating a stack of a medium sized blast furnace core according to claim 1, wherein said step of increasing the ratio of magnesium oxide to aluminum oxide in the slag comprises adding serpentine to the blast furnace burden.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0826376B2 (en) * | 1990-02-21 | 1996-03-13 | 新日本製鐵株式会社 | Blast furnace core measuring method and device |
| JPH05331510A (en) * | 1992-06-01 | 1993-12-14 | Kawasaki Steel Corp | Method for activating furnace core of blast furnace |
| JP2694590B2 (en) * | 1992-10-09 | 1997-12-24 | 新日本製鐵株式会社 | Method for diagnosing core active state and method for core activation |
| JP2002241814A (en) * | 2001-02-16 | 2002-08-28 | Nippon Steel Corp | Method for heating up furnace core part by injecting oxygen-containing powdery material |
| CN109609714B (en) * | 2018-12-04 | 2020-07-24 | 江苏省沙钢钢铁研究院有限公司 | Diagnosis method for large-scale blast furnace core accumulation |
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Address after: 215624 Shagang science and technology building, Yongxin Road, Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: INSTITUTE OF RESEARCH OF IRON & STEEL,SHAGANG,JIANGSU PROVINCE Country or region after: China Patentee after: Jiangsu Shagang Steel Co.,Ltd. Patentee after: JIANGSU SHAGANG GROUP Co.,Ltd. Address before: 215624 Shagang science and technology building, Yongxin Road, Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: INSTITUTE OF RESEARCH OF IRON & STEEL,SHAGANG,JIANGSU PROVINCE Country or region before: China Patentee before: ZHANGJIAGANG HONGCHANG STEEL PLATE Co.,Ltd. Patentee before: JIANGSU SHAGANG GROUP Co.,Ltd. |