CN113174452A - Method for rapidly achieving yield of medium titanium slag smelted blast furnace after damping down - Google Patents
Method for rapidly achieving yield of medium titanium slag smelted blast furnace after damping down Download PDFInfo
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- CN113174452A CN113174452A CN202110437958.7A CN202110437958A CN113174452A CN 113174452 A CN113174452 A CN 113174452A CN 202110437958 A CN202110437958 A CN 202110437958A CN 113174452 A CN113174452 A CN 113174452A
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- 238000013016 damping Methods 0.000 title claims abstract description 132
- 239000002893 slag Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 32
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000010936 titanium Substances 0.000 title claims abstract description 18
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 127
- 239000000571 coke Substances 0.000 claims abstract description 101
- 229910052742 iron Inorganic materials 0.000 claims abstract description 64
- 239000000463 material Substances 0.000 claims abstract description 38
- 238000003723 Smelting Methods 0.000 claims abstract description 37
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- 238000007664 blowing Methods 0.000 claims abstract description 18
- 230000000903 blocking effect Effects 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000033764 rhythmic process Effects 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims abstract description 3
- 239000003245 coal Substances 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000011084 recovery Methods 0.000 claims description 12
- 210000001015 abdomen Anatomy 0.000 claims description 7
- 229910000805 Pig iron Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000008188 pellet Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical class [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention relates to a method for quickly achieving yield of a medium titanium slag smelting blast furnace after damping down, which comprises the following steps: 1-2 days before damping down, the schreyerite smelting is changed into the common ore smelting; ore batch reduction is carried out 8h-12h before damping down according to the material speed and the smelting intensity; controlling the coke adding and damping-down time and the tapping rhythm according to the actual material speed and the planned damping-down time; adding the damping-down coke according to the damping-down time, wherein the damping-down coke is added in two groups; discharging iron slag in the furnace completely by using an iron blowing opening when the wind stops; uniformly blocking different air ports according to different rest time lengths; after the air supply is finished, adding air, and after the air supply of the blast furnace is finished, opening an iron notch in front of the blast furnace for tapping; starting poking an air opening; and when the air volume is gradually restored to 45-50% of the normal air volume, corresponding operation is executed. The invention solves the problems of difficult slag iron discharge, tuyere breakage, hearth accumulation, abnormal furnace conditions and the like after blowing down and re-blowing of the blast furnace smelted by medium titanium slag schreyerite, and ensures that the yield-reaching process after blowing down of the blast furnace smelted by the medium titanium slag schreyerite is efficient, rapid and safe.
Description
Technical Field
The invention belongs to the field of medium titanium slag smelting, and particularly relates to a method for quickly achieving yield of a medium titanium slag smelting blast furnace after damping down.
Background
The operation difficulty of the blast furnace is high in the yield-reaching process after the blast furnace is shut down in the medium titanium slag smelting process, abnormal conditions such as difficult iron slag discharge, damaged tuyere after re-wind, furnace hearth accumulation, abnormal furnace condition and the like often occur, the yield is reached after the blast furnace is blown down for 48-72 hours, and even longer time is needed. Needs to consume a large amount of manpower, material resources and financial resources, influences the normal production of the post-iron process, and needs to be optimized in order to solve the problem that the furnace condition recovery process of the medium titanium slag smelting blast furnace after damping down is slow.
Disclosure of Invention
In order to solve the problems of slow furnace condition recovery process and large furnace workload after damping down of the medium titanium slag smelting blast furnace, the invention provides a method for quickly achieving production after damping down of the medium titanium slag smelting blast furnace.
The technical scheme of the invention is as follows:
a method for rapidly achieving yield of a medium titanium slag smelting blast furnace after damping down comprises the following steps:
before damping down, 1-2 days are advanced, and schreyerite smelting is changed into ordinary ore smelting;
ore batch reduction is carried out 8-12 h before the damping down according to the material speed and the smelting intensity;
step (3) controlling the damping-down coke adding time and the tapping rhythm according to the actual material speed and the planned damping-down time;
adding damping-down coke according to the damping-down time, wherein the damping-down coke is added in two groups;
discharging iron slag in the furnace completely by using an iron blowing opening during damping down, and controlling the top temperature to be 150-280 ℃ during damping down so as to ensure that the furnace top can be ignited smoothly after damping down;
uniformly blocking different air ports according to different rest time lengths;
step (7) after the gas is introduced into the air supply, adding air to the air pressure of 0.07-0.13Mpa, gradually adding air after the material is moved, and controlling the air speed within +/-8% of the normal standard air speed within 30-60 min after air recovery; opening an iron notch in front of the blast furnace to cast iron after the blast furnace supplies air for 50min, and controlling the time between casting iron within 10-40 min;
and (8) poking the air opening when the following points are met:
the iron slag can be smoothly discharged from the iron notch; the tuyere has no slag gushing and slag adhering phenomena after tapping; the furnace temperature is increased again, and the physical heat is more than 1390 ℃; the feeding device can stand after being aerated, and the feeding is stable;
step (9) when the air volume is recovered to 45-50% of the normal air volume, gradually increasing the top pressure, and controlling the pressure difference to be less than 0.160 MPa;
after the blast furnace air volume reaches 65-75% of the normal air volume, coal injection is carried out according to 30-40% of the normal coal injection volume, the increased batch heavy ore coke load is 8-10%, and the coal injection volume is increased by 8-12% when the air volume coal injection volume increased by 10-20% is increased;
after the blast furnace air volume reaches 80-90% of the normal air volume, rich oxygen 1/4-1/2 is added, the proportion of sinter ore is increased, the proportion of lump ore or pellet ore is reduced, the alkalinity of the slag is gradually improved, and the alkalinity of the slag is controlled to be 1.08-1.12 times;
when the normal air volume is reached, the batch weight load is recovered to 85% -95% of the normal material, the schreyerite smelting is recovered 4 hours after the normal air volume is reached, and the batch weight and the ore coke load are recovered to the normal level.
Further, in the step (1), the furnace wall and the furnace hearth are washed by controlling the alkalinity of the furnace slag to be 1.04 to 1.10 times, the content of [ Si ] in the pig iron is controlled to be 0.3 to 0.5 percent before damping down, the temperature of the molten iron is more than 1450 ℃, and the alkalinity of the furnace slag is controlled to be 1.03 to 1.05 times.
Further, in the step (2), the ore batch is reduced to 85-95% of the weight of the normal ore batch according to the material speed and the smelting strength, and the load of the batch heavy ore coke is reduced to 88-95% of the normal load.
Further, in the step (3), the specific process of controlling the time of adding the damping-down coke and the tapping rhythm is as follows:
damping down within 24h, and controlling the foremost clean coke to stay at the lower part of the furnace waist or the upper part of the furnace belly when damping down; damping down within more than 24h and less than or equal to 48h, and controlling the foremost clean coke to stay at the upper part or the middle part of the furnace bosh during damping down; and (4) damping down for more than 48h and less than or equal to 72h, and controlling the foremost clean coke to stay at the middle part of the furnace bosh during damping down.
Further, in the step (4), the specific process is as follows:
2-3 batches of damping down coke are added to the first group in 24h, and 1-2 batches of damping down coke are added to the second group at four intervals; 4-5 batches of damping down coke are added into the first damping down group within more than 24h and less than or equal to 48h, and 2-3 batches of damping down coke are added into the second damping down group at four intervals; 6-7 batches of damping down coke are added into the first damping down group within more than 48h and less than or equal to 72h, and 2-4 batches of damping down coke are added into the second damping down group at four intervals; the next batch of normal materials added with the damping down coke are concentrated and added with lump ore to control the alkalinity of slag to be 1.03-1.05 times, so that the influence on the fluidity of iron slag caused by overhigh alkalinity when the concentrated coke is discharged from the furnace is avoided.
Further, in the step (5), in order to reduce heat loss, the tuyere is uniformly blocked by water stemming after the damping down, the flow of cooling water of the blast furnace body is reduced to 1/3-1/2 which is normal 2h after the damping down, and the blast furnace body is restored to a normal level before the re-wind.
Further, in the step (6), during 24h of damping down, 20-30% of the number of air ports are uniformly blocked, and 70-80% of the number of air ports are opened; blowing down for more than 24 hours and less than or equal to 48 hours, uniformly blocking 30-40% of the number of air ports, and opening 60-70% of the number of air ports; when the damping down is carried out for more than 48 hours and less than or equal to 72 hours, 55-65% of the tuyere number is uniformly blocked, and 35-45% of the tuyere number is opened.
Further, in the step (8), poking the air ports from the direction close to the iron ports, poking 1-2 air ports at the later stage of each iron furnace, and steadily adding air after opening the air ports, wherein the air speed is controlled within +/-8% of the normal standard air speed.
Step (1), controlling the alkalinity of the slag to be 1.04-1.10 times, washing the furnace wall and the furnace hearth, controlling the content of [ Si ] in the pig iron to be 0.3% -0.5% before damping down, controlling the temperature of molten iron to be more than 1450 ℃, controlling the alkalinity of the slag to be 1.03-1.05 times, reducing the concentration of high-melting-point carbon nitrogen compounds in the furnace, and creating conditions for furnace condition recovery.
And (2) reducing the weight of the ore batch to 85-95% of that of the normal ore batch according to the material speed and the smelting strength, reducing the coke load of the batch heavy ore to 88-95% of that of the normal load, improving the air permeability of the material column before and after damping down, and laying a foundation for the rapid recovery of the furnace condition.
Step (3), damping down within 24h, and controlling the foremost clean coke to stay at the lower part of the furnace waist or the upper part of the furnace belly when damping down; damping down within more than 24h and less than or equal to 48h, and controlling the foremost clean coke to stay at the upper part or the middle part of the furnace bosh during damping down; when the blast furnace is stopped for more than 48 hours and less than or equal to 72 hours, the foremost clean coke is controlled to stay in the middle of the furnace belly when the blast furnace is stopped, so that the air permeability of the soft melting zone of the blast furnace can be improved, and abundant heat can be ensured after the blast furnace is re-aired.
Step (4), adding 2-3 batches of damping-down coke into the first damping-down group within 24h, and adding 1-2 batches of damping-down coke into the second damping-down group at four intervals; 4-5 batches of damping down coke are added into the first damping down group within more than 24h and less than or equal to 48h, and 2-3 batches of damping down coke are added into the second damping down group at four intervals; 6-7 batches of damping down coke are added into the first damping down group within more than 48h and less than or equal to 72h, and 2-4 batches of damping down coke are added into the second damping down group at four intervals; the next batch of normal material added with the damping-down coke is intensively added with lump ore to control the alkalinity of the slag to be 1.03 to 1.05 times. The method ensures that the blowing-down coke is delivered to the hearth in time after the blast furnace is re-blown, supplements the heat of the hearth, and ensures the good fluidity of the slag after re-blown.
Step (6), damping down within 24 hours, uniformly blocking 20-30% of air ports and opening 70-80% of air ports; blowing down for more than 24 hours and less than or equal to 48 hours, uniformly blocking 30-40% of the number of air ports, and opening 60-70% of the number of air ports; when the damping down is carried out for more than 48 hours and less than or equal to 72 hours, 55-65% of the tuyere number is uniformly blocked, and 35-45% of the tuyere number is opened. The method can ensure that the opened air port has enough wind speed and kinetic energy after the air is overflowed, and promote the blast furnace to recover quickly.
Step (7), after the gas is introduced by air supply, adding air to the air pressure of 0.07-0.13Mpa, gradually adding air after the material is moved, and controlling the air speed within +/-8% of the normal standard air speed within 30-60 min after air recovery; and (3) opening an iron notch in front of the blast furnace for tapping after the blast furnace supplies air for 50min, and controlling the tapping interval time to be 10-40 min. The step promotes the blast furnace wind speed to be increased to a normal level as soon as possible at the early stage of air recovery, promotes the tuyere raceway to reach the normal level as soon as possible, and reduces the risk of tuyere burning.
And (8) poking the air opening when the following points are met:
the iron slag can be smoothly discharged from the iron notch; the tuyere has no slag gushing and slag adhering phenomena after tapping; the furnace temperature is increased again, and the physical heat is more than 1390 ℃; the feeding device can stand after being aerated, and the feeding is stable; the time of poking the air inlet is well held, so that the recovery of the furnace condition can be accelerated, and the effect of achieving twice the result with half the effort is achieved.
Compared with the prior art, the invention has the following beneficial effects:
after improvement, the method solves the problems of difficult slag iron discharge, tuyere breakage, hearth accumulation, abnormal furnace conditions and the like after the blast furnace is shut down and re-aired in the medium titanium slag schreyerite smelting process, ensures that the production reaching process after the blast furnace is shut down in the medium titanium slag schreyerite smelting process is efficient, rapid and safe, reduces the production reaching time to 16-42h after air supply, is 1/3-2/3 faster than the traditional operation, and saves a large amount of manpower, material resources and financial resources.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of examples of the present invention, and not all examples. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The method for rapidly achieving the yield of the medium titanium slag smelted blast furnace after damping down comprises the following steps:
changing schreyerite smelting into common ore smelting 1 day before damping down, controlling the slag alkalinity to be 1.04 times, washing a furnace wall and a furnace hearth, controlling the pig iron content to be 0.3 percent, the molten iron temperature to be 1600 ℃, and controlling the slag alkalinity to be 1.03 times before damping down.
And (3) reducing the ore batch to 85% of the weight of the normal ore batch and reducing the coke load of the batch to 88% of the normal load 8h before the damping down of the step (2) according to the material speed and the smelting strength.
Step (3) controlling the time of adding the rest coke and the tapping rhythm according to the actual material speed and the planned rest time, and controlling the foremost clean coke to stay at the lower part of the furnace waist or the upper part of the furnace belly during the rest in 24 hours of rest; damping down within more than 24h and less than or equal to 48h, and controlling the foremost clean coke to stay at the upper part or the middle part of the furnace bosh during damping down; and (4) damping down for more than 48h and less than or equal to 72h, and controlling the foremost clean coke to stay at the middle part of the furnace bosh during damping down.
Adding damping-down coke according to the damping-down time, wherein the damping-down coke is added in two groups, the first group of damping-down coke is added for 2 batches in 24 hours, and the second group of damping-down coke is added for 1 batch every four batches of normal materials; adding 4 batches of damping-down coke into the first damping-down group within more than 24 hours and less than or equal to 48 hours, and adding 2 batches of damping-down coke into the second damping-down group at four intervals; adding 6 batches of damping-down coke into the first damping-down group within more than 48h and less than or equal to 72h, and adding 2 batches of damping-down coke into the second damping-down group at four intervals; the next batch of normal materials added with the damping down coke needs to be intensively added with lump ore to control the alkalinity of slag to be 1.03 times, so that the influence on the fluidity of slag iron caused by overhigh alkalinity when the centralized coke is discharged from the furnace is avoided.
And (5) discharging the iron slag in the furnace completely by using the blowing iron hole during damping down, and controlling the top temperature to be 150 ℃ during damping down so as to ensure that the furnace top can be smoothly ignited after damping down.
In order to reduce heat loss, the tuyere is uniformly blocked by water stemming after damping down, the cooling water flow of the blast furnace body is reduced to 1/3 which is normal 2h after damping down, and the blast furnace body is restored to the normal level before re-wind.
Step (6) uniformly blocking different air ports according to different rest time lengths
Blowing down within 24h, uniformly plugging 20 percent of air ports and opening 80 percent of air ports; blowing down for more than 24 hours and less than or equal to 48 hours, uniformly blocking 30 percent of air ports, and opening 70 percent of air ports; when the damping down is carried out for more than 48 hours and less than or equal to 72 hours, 55 percent of the tuyere number is uniformly blocked, and 45 percent of the tuyere number is opened.
And (7) after the air supply is finished and the coal gas is introduced, adding air to the air pressure of 0.07Mpa, gradually adding air after the material is moved, and controlling the air speed within +/-8% of the normal standard air speed within 30min after air recovery. And (3) opening an iron notch to discharge iron in front of the blast furnace after the blast furnace supplies air for 50min, and controlling the time between the iron tapping and the iron tapping to be 10 min.
And (8) poking the air opening when the following points are met:
the iron slag can be smoothly discharged from the iron notch; the tuyere has no slag gushing and slag adhering phenomena after tapping; the furnace temperature is increased again, and the physical heat is 1400 ℃; the feeding device can stand after being aerated, and the feeding is stable. And poking the air ports from the direction close to the iron ports, poking 1 air port at the later stage of each furnace iron, stably adding air after the air ports are opened, and controlling the air speed within +/-8% of the normal standard air speed.
And (9) when the air volume is recovered to 45 percent of the normal air volume, gradually increasing the top pressure, and controlling the pressure difference to be less than 0.160 MPa.
After the blast furnace air volume reaches 65% of the normal air volume, coal injection is carried out according to 30% of the normal coal injection volume, the increased batch heavy ore coke load is 8%, and the coal injection volume is increased by 8% when the air volume of 10% is increased; after the blast furnace air volume reaches 80% of the normal air volume, oxygen is enriched 1/4, the proportion of sinter ore is increased, the proportion of lump ore or pellet ore is reduced, the alkalinity of the slag is gradually improved, and the alkalinity of the slag is controlled to be 1.08 times; when the normal air quantity is reached, the batch weight load is recovered to 85% of the normal material, the schreyerite smelting is recovered 4 hours after the normal air quantity is reached, and the batch weight and the ore coke load are recovered to normal levels.
Example 2
The method for rapidly achieving the yield of the medium titanium slag smelted blast furnace after damping down comprises the following steps:
step (1) before damping down, the schreyerite smelting is changed into the ordinary ore smelting 2 days in advance, the furnace wall and the furnace hearth are washed by controlling the alkalinity of the furnace slag to be 1.10 times, the pig iron content [ Si ] is controlled to be 0.5 percent before damping down, the temperature of molten iron is 1700 ℃, and the alkalinity of the furnace slag is controlled to be 1.05 times.
And (3) before the damping down of the step (2), the ore batch is contracted to 95% of the weight of the normal ore batch according to the material speed and the smelting strength, and the load of the batch heavy ore coke is reduced to 95% of the normal load.
Step (3) controlling the time of adding the rest coke and the tapping rhythm according to the actual material speed and the planned rest time, and controlling the foremost clean coke to stay at the lower part of the furnace waist or the upper part of the furnace belly during the rest in 24 hours of rest; damping down within more than 24h and less than or equal to 48h, and controlling the foremost clean coke to stay at the upper part or the middle part of the furnace bosh during damping down; and (4) damping down for more than 48h and less than or equal to 72h, and controlling the foremost clean coke to stay at the middle part of the furnace bosh during damping down.
Adding damping-down coke according to the damping-down time, wherein the damping-down coke is added in two groups, the first group of damping-down coke is added in 3 batches in 24 hours, and the second group of damping-down coke is added in 2 batches every four batches of normal materials; adding 5 batches of damping-down coke into the first damping-down group within more than 24 hours and less than or equal to 48 hours, and adding 3 batches of damping-down coke into the second damping-down group at four intervals; 7 batches of damping down coke are added to the first damping down group within more than 48h and less than or equal to 72h, and 4 batches of damping down coke are added to the second damping down group at four intervals; the next batch of normal materials added with the damping down coke needs to be intensively added with lump ore to control the alkalinity of slag to be 1.05 times, so that the influence on the fluidity of slag iron caused by overhigh alkalinity when the centralized coke is discharged from the furnace is avoided.
And (5) discharging the iron slag in the furnace completely by using the blowing iron hole during damping down, and controlling the top temperature to be 280 ℃ during damping down so as to ensure that the furnace top can be smoothly ignited after damping down. In order to reduce heat loss, the tuyere is uniformly blocked by water stemming after damping down, the cooling water flow of the blast furnace body is reduced to 1/2 which is normal 2h after damping down, and the blast furnace body is restored to the normal level before re-wind.
Step (6) uniformly blocking different air ports according to different rest time lengths
Blowing down within 24h, uniformly plugging 30% of air ports and opening 70% of air ports; blowing down for more than 24 hours and less than or equal to 48 hours, uniformly blocking 40 percent of air ports and opening 60 percent of air ports; when the damping down is carried out for more than 48 hours and less than or equal to 72 hours, 65 percent of tuyere number is uniformly blocked, and 35 percent of tuyere number is opened.
And (7) after the air supply is finished and the coal gas is introduced, adding air to the air pressure of 0.13Mpa, gradually adding air after the material is moved, and controlling the air speed within +/-8% of the normal standard air speed within 60min after air recovery. And (3) opening an iron notch to discharge iron in front of the blast furnace after the blast furnace supplies air for 50min, and controlling the iron discharge interval time to be 40 min.
And (8) poking the air opening when the following points are met:
the iron slag can be smoothly discharged from the iron notch; the tuyere has no slag gushing and slag adhering phenomena after tapping; the furnace temperature is increased again, and the physical heat is 1500 ℃; the feeding device can stand after being aerated, and the feeding is stable. And poking the air ports from the direction close to the iron ports, poking 2 air ports at the later stage of each furnace iron, stably adding air after the air ports are opened, and controlling the air speed within +/-8% of the normal standard air speed.
And (9) when the air volume is recovered to 50% of the normal air volume, gradually increasing the top pressure, and controlling the pressure difference to be less than 0.160 MPa.
After the blast furnace air volume reaches 75% of the normal air volume, coal injection is carried out according to 35% of the normal coal injection volume, the increased batch heavy ore coke load is 10%, and the coal injection volume is increased by 12% when the air volume of each 20% is increased; after the blast furnace air volume reaches 90% of the normal air volume, oxygen is enriched 1/4, the proportion of sinter ore is increased, the proportion of lump ore or pellet ore is reduced, the alkalinity of the slag is gradually improved, and the alkalinity of the slag is controlled to be 1.12 times; when the normal air quantity is reached, the batch weight load is recovered to 95 percent of the normal material, the schreyerite smelting is recovered 4 hours after the normal air quantity is reached, and the batch weight and the ore coke load are recovered to normal level.
Example 3
The method for rapidly achieving the yield of the medium titanium slag smelted blast furnace after damping down comprises the following steps:
changing schreyerite smelting into common ore smelting 1 day before damping down, controlling the slag alkalinity to be 1.08 times, washing a furnace wall and a furnace hearth, controlling the pig iron content to be 0.4 percent, the molten iron temperature to be 1500 ℃ and controlling the slag alkalinity to be 1.04 times before damping down.
And (3) before the damping down of the step (2), the ore batch is contracted to 90% of the weight of the normal ore batch according to the material speed and the smelting strength, and the coke load of the batch heavy ore is reduced to 92% of the normal load.
Step (3) controlling the time of adding the rest coke and the tapping rhythm according to the actual material speed and the planned rest time, and controlling the foremost clean coke to stay at the lower part of the furnace waist or the upper part of the furnace belly during the rest in 24 hours of rest; damping down within more than 24h and less than or equal to 48h, and controlling the foremost clean coke to stay at the upper part or the middle part of the furnace bosh during damping down; and (4) damping down for more than 48h and less than or equal to 72h, and controlling the foremost clean coke to stay at the middle part of the furnace bosh during damping down.
Adding damping-down coke according to the damping-down time, wherein the damping-down coke is added in two groups, the first group of damping-down coke is added in 3 batches in 24 hours, and the second group of damping-down coke is added in 2 batches every four batches of normal materials; adding 5 batches of damping-down coke into the first damping-down group within more than 24 hours and less than or equal to 48 hours, and adding 2-3 batches of damping-down coke into the second damping-down group at four intervals; 7 batches of damping down coke are added to the first damping down group within more than 48h and less than or equal to 72h, and 3 batches of damping down coke are added to the second damping down group at four intervals; the next batch of normal materials added with the damping down coke needs to be intensively added with lump ore to control the alkalinity of the slag to be 1.04 times, so that the influence on the fluidity of the iron slag caused by overhigh alkalinity when the centralized coke is discharged from the furnace is avoided.
And (5) discharging the iron slag in the furnace completely by using the blowing iron hole during damping down, and controlling the top temperature to be 200 ℃ during damping down so as to ensure that the furnace top can be smoothly ignited after damping down. In order to reduce heat loss, the tuyere is uniformly blocked by water stemming after damping down, the cooling water flow of the blast furnace body is reduced to 1/2 which is normal 2h after damping down, and the blast furnace body is restored to the normal level before re-wind.
Step (6) uniformly blocking different air ports according to different rest time lengths
Blowing down within 24h, uniformly plugging 25% of air ports and opening 75% of air ports; blowing down for more than 24 hours and less than or equal to 48 hours, uniformly blocking 40 percent of air ports and opening 60 percent of air ports; when the damping down is carried out for more than 48 hours and less than or equal to 72 hours, 65 percent of tuyere number is uniformly blocked, and 35 percent of tuyere number is opened.
And (7) after the air supply and the gas introduction are finished, adding air to the air pressure of 0.1Mpa, gradually adding air after the material movement, and controlling the air speed within +/-8% of the normal standard air speed within 40min after air recovery. And (3) opening an iron notch to discharge iron in front of the blast furnace after the blast furnace supplies air for 50min, and controlling the iron discharge interval time to be 20 min.
And (8) poking the air opening when the following points are met:
the iron slag can be smoothly discharged from the iron notch; the tuyere has no slag gushing and slag adhering phenomena after tapping; the furnace temperature is increased again, and the physical heat is 1450 ℃; the feeding device can stand after being aerated, and the feeding is stable. And poking the air ports from the direction close to the iron ports, poking 2 air ports at the later stage of each furnace iron, stably adding air after the air ports are opened, and controlling the air speed within +/-8% of the normal standard air speed.
And (9) when the air volume is recovered to 50% of the normal air volume, gradually increasing the top pressure, and controlling the pressure difference to be less than 0.160 MPa.
After the blast furnace air volume reaches 70% of the normal air volume, coal injection is carried out according to 30% of the normal coal injection volume, the increased batch heavy ore coke load is 9%, and the coal injection volume is increased by 10% when the air volume is increased by 13%; after the blast furnace air volume reaches 85% of the normal air volume, oxygen is enriched 1/3, the proportion of sinter ore is increased, the proportion of lump ore or pellet ore is reduced, the alkalinity of the slag is gradually improved, and the alkalinity of the slag is controlled to be 1.10 times; when the normal air volume is reached, the batch weight load is recovered to 90 percent of the normal material, the schreyerite smelting is recovered 4 hours after the normal air volume is reached, and the batch weight and the ore coke load are recovered to normal level.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for rapidly achieving yield of a medium titanium slag smelting blast furnace after damping down is characterized by comprising the following steps: the method comprises the following steps:
before damping down, 1-2 days are advanced, and schreyerite smelting is changed into ordinary ore smelting;
ore batch reduction is carried out 8-12 h before the damping down according to the material speed and the smelting intensity;
step (3) controlling the damping-down coke adding time and the tapping rhythm according to the actual material speed and the planned damping-down time;
adding damping-down coke according to the damping-down time, wherein the damping-down coke is added in two groups;
discharging iron slag in the furnace completely by using an iron blowing opening during damping down, and controlling the top temperature to be 150-280 ℃ during damping down so as to ensure that the furnace top can be ignited smoothly after damping down;
uniformly blocking different air ports according to different rest time lengths;
step (7) after the gas is introduced into the air supply, adding air to the air pressure of 0.07-0.13Mpa, gradually adding air after the material is moved, and controlling the air speed within +/-8% of the normal standard air speed within 30-60 min after air recovery; opening an iron notch in front of the blast furnace to cast iron after the blast furnace supplies air for 50min, and controlling the time between casting iron within 10-40 min;
and (8) poking the air opening when the following points are met:
the iron slag can be smoothly discharged from the iron notch; the tuyere has no slag gushing and slag adhering phenomena after tapping; the furnace temperature is increased again, and the physical heat is more than 1390 ℃; the feeding device can stand after being aerated, and the feeding is stable;
step (9) when the air volume is recovered to 45-50% of the normal air volume, gradually increasing the top pressure, and controlling the pressure difference to be less than 0.160 MPa;
after the blast furnace air volume reaches 65-75% of the normal air volume, coal injection is carried out according to 30-40% of the normal coal injection volume, the increased batch heavy ore coke load is 8-10%, and the coal injection volume is increased by 8-12% when the air volume coal injection volume increased by 10-20% is increased;
after the blast furnace air volume reaches 80-90% of the normal air volume, rich oxygen 1/4-1/2 is added, the proportion of sinter ore is increased, the proportion of lump ore or pellet ore is reduced, the alkalinity of the slag is gradually improved, and the alkalinity of the slag is controlled to be 1.08-1.12 times;
when the normal air volume is reached, the batch weight load is recovered to 85% -95% of the normal material, the schreyerite smelting is recovered 4 hours after the normal air volume is reached, and the batch weight and the ore coke load are recovered to the normal level.
2. The method of claim 1, wherein: in the step (1), the furnace wall and the furnace hearth are washed by controlling the alkalinity of the furnace slag to be 1.04 to 1.10 times, the content of [ Si ] in the pig iron is controlled to be 0.3 to 0.5 percent before damping down, the temperature of the molten iron is more than 1450 ℃, and the alkalinity of the furnace slag is controlled to be 1.03 to 1.05 times.
3. The method of claim 1, wherein: in the step (2), ore batches are reduced to 85-95% of the weight of the normal ore batch according to the material speed and the smelting strength, and the load of the batch heavy ore coke is reduced to 88-95% of the normal load.
4. The method of claim 1, wherein: in the step (3), the concrete process of controlling the time of adding the damping-down coke and the tapping rhythm is as follows:
damping down within 24h, and controlling the foremost clean coke to stay at the lower part of the furnace waist or the upper part of the furnace belly when damping down; damping down within more than 24h and less than or equal to 48h, and controlling the foremost clean coke to stay at the upper part or the middle part of the furnace bosh during damping down; and (4) damping down for more than 48h and less than or equal to 72h, and controlling the foremost clean coke to stay at the middle part of the furnace bosh during damping down.
5. The method of claim 1, wherein: in the step (4), the specific process is as follows:
2-3 batches of damping down coke are added to the first group in 24h, and 1-2 batches of damping down coke are added to the second group at four intervals; 4-5 batches of damping down coke are added into the first damping down group within more than 24h and less than or equal to 48h, and 2-3 batches of damping down coke are added into the second damping down group at four intervals; 6-7 batches of damping down coke are added into the first damping down group within more than 48h and less than or equal to 72h, and 2-4 batches of damping down coke are added into the second damping down group at four intervals; the next batch of normal material added with the damping-down coke is intensively added with lump ore to control the alkalinity of the slag to be 1.03 to 1.05 times.
6. The method of claim 1, wherein: in the step (5), the tuyere is uniformly blocked by water stemming after damping down, the flow of cooling water of the blast furnace body is reduced to be from 1/3 to 1/2 after damping down for 2 hours, and the blast furnace body is restored to be at a normal level before air reblowing.
7. The method of claim 1, wherein: in the step (6), the air is stopped within 24 hours, 20-30% of air ports are uniformly blocked, and 70-80% of air ports are opened; blowing down for more than 24 hours and less than or equal to 48 hours, uniformly blocking 30-40% of the number of air ports, and opening 60-70% of the number of air ports; when the damping down is carried out for more than 48 hours and less than or equal to 72 hours, 55-65% of the tuyere number is uniformly blocked, and 35-45% of the tuyere number is opened.
8. The method of claim 1, wherein: in the step (8), poking the air ports from the direction close to the iron ports, poking 1-2 air ports at the later stage of each iron furnace, stably adding air after the air ports are opened, and controlling the air speed within +/-8% of the normal standard air speed.
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