CN113832268A - Method for quickly recovering furnace condition - Google Patents
Method for quickly recovering furnace condition Download PDFInfo
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- CN113832268A CN113832268A CN202111083429.8A CN202111083429A CN113832268A CN 113832268 A CN113832268 A CN 113832268A CN 202111083429 A CN202111083429 A CN 202111083429A CN 113832268 A CN113832268 A CN 113832268A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000000571 coke Substances 0.000 claims abstract description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000001301 oxygen Substances 0.000 claims abstract description 40
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 40
- 229910052742 iron Inorganic materials 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000007664 blowing Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 8
- 238000003860 storage Methods 0.000 claims abstract description 6
- 238000013016 damping Methods 0.000 claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 238000001816 cooling Methods 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 11
- 239000003245 coal Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 5
- 239000003034 coal gas Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- 239000008234 soft water Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C21B5/007—Conditions of the cokes or characterised by the cokes used
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
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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 discloses a method for rapidly recovering furnace conditions, wherein when air supply is recovered, an oxygen lance is buried from an iron notch before blowing in, coke is immediately combusted after air supply of a blast furnace, the air quantity is maintained to be about 20-35% of the normal air quantity, and air is added to be 80-90% of the normal air quantity after air supply is carried out for 6 hours; the air quantity reaches 3800m after 10-12 hours of air supply3/min‑41003Min, and properly enriching oxygen to 3600m3/h‑4000m3H; after the air is re-ventilated for 20-24 hours, the batch weight is increased and oxygen is enriched to 6000m3And h, when the thermal storage of the furnace hearth is normal, all control parameters tend to be normal, the furnace temperature tends to be stable, and normal production is carried out. The method for rapidly recovering the furnace condition can realize the rapid re-production of iron slag in 6-8 hours of the blast furnace by burying the patent oxygen lance from the iron notch before blowing in the furnace, and can recover normal air pressure and full opening of the tuyere in about 24 hours, thereby being capable of recovering the normal air pressure and full opening of the tuyereThe furnace condition is recovered in a short time, the yield is quickly achieved, the air quantity adding speed is high, the load adjusting period is short, and the problems that the labor intensity of workers in front of the furnace is high and the material consumption is high during blowing in are avoided.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a method for quickly recovering furnace conditions.
Background
After the blast furnace is opened to reach the yield quickly, all economic and technical indexes are gradually improved, as the coal ratio is increased, the coke ratio is continuously reduced, the air permeability of a stock column is deteriorated, certain difficulty is brought to the recovery of the furnace condition after the blast furnace is stopped, and the problems of early stage forced air addition, heat stable operation failure, long recovery time and the like are strictly presented.
The problems of serious insufficient furnace hearth temperature, large fluctuation of furnace conditions, difficult opening of a blast furnace iron notch and the like caused by long furnace shutdown time are solved, the labor intensity of workers in front of the furnace is high during furnace startup, the material consumption is high, the smooth operation, high yield and stable yield of the blast furnace are influenced, and the safety production is also potentially restricted.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for quickly recovering the furnace condition, which has the advantages of recovering the furnace condition in a short time and quickly achieving the production, and solves the problems that the labor intensity of workers in front of the furnace is high, the material consumption is high, and the smooth operation, the high yield and the stable yield of a blast furnace are influenced when the furnace is opened.
(II) technical scheme
In order to achieve the purposes of recovering the furnace condition in a short time and achieving the production quickly, the invention provides the following technical scheme: a method of rapidly restoring furnace conditions, comprising the steps of:
1) before the blast furnace condition is recovered, the furnace condition is adjusted before the damping down, the furnace condition is ensured to be stable and smooth, the working condition of a furnace cylinder is good, the distribution of gas flow is reasonable, and in order to rapidly rebuild and manufacture good conditions of the gas flow when the furnace condition is recovered, the temperature of iron is ensured to be not less than 1480 ℃ usually 24 hours before the damping down, the temperature of the furnace is sufficient, 15 tons of coke are intensively added 7 hours before the damping down, the iron number [ Si ] of the last furnace before the damping down is not less than 0.4%, the temperature of the iron is not less than 1480 ℃, the safety of the damping down is improved, 500 tons of coke are added 5 hours before the damping down, then the material light load is changed immediately, 200 tons of coke are intensively added after 10 batches of the light load material, and the damping down time is estimated to be about 240 hours;
2) sealing the furnace body when the furnace body is shut down, immediately replacing the leaking air port after the furnace body is shut down, plugging the air port tightly by using stemming, poking 8 air ports at symmetrical angles every two hours, observing the red hot state of coke at the front end of the air port, and timely finding the water leakage condition of a cooling system above the air port; stopping the high-pressure water pump and the soft water pump one after four hours after the damping down, reducing the water pressure of cooling water, reducing water quantity, ensuring the lowest cooling circulation, keeping normal water temperature difference, reducing the pressure of the bottom of the furnace by water cooling after 24 hours of damping down, and reducing heat loss; in order to quickly reduce the temperature of the furnace top and facilitate the maintenance, the charge level is reduced to 4 meters before damping down, steam is introduced into the furnace top and filled with cold charge after damping down, and finally 4 batches of materials are only added with ore without coke;
3) when the air supply is returned, an oxygen lance is buried in the blast furnace from the iron notch before the blast furnace is opened, coke is immediately combusted after the blast furnace supplies air, the air quantity is maintained to be about 20-35% of the normal air quantity, the pressure difference is controlled, the coke is stably combusted, the damage of the two tuyere sleeves is avoided as much as possible, and meanwhile, the top temperature is increased as soon as possible to lead the coal gas;
4) after air supply is carried out for 6 hours, the safety and the proper air speed of an air port are ensured, the reverse thrust air quantity and the air speed are calculated according to theory, and meanwhile, the standard air speed is properly improved according to the level of the air pressure; while the manganese ore is continuously used for washing the furnace, on the premise of keeping good fluidity of molten iron, opening a tuyere according to the working conditions of a furnace hearth and the tuyere, strictly increasing the top pressure according to a certain proportion according to the standard wind speed of less than or equal to 200m/s, and adding the wind to 80-90% of the normal wind quantity;
5) the air quantity reaches 3800m after 10-12 hours of air supply3/min-41003Min, properly increasing the standard wind speed to the full wind level, sequentially increasing the ore batch weight to increase the slag alkalinity and reduce the burden coke ratio in order to prevent the excessive development of central air flow in the process of blowing air at an air opening, and properly enriching oxygen to 3600m3/h-4000m3/h；
6) After the air is re-ventilated for 20-24 hours, the batch weight is increased and oxygen is enriched to 6000m3The furnace temperature will gradually descend, the return air speed can be slowed down according to the situation, the air quantity and the oxygen quantity are increased gradually along with the heavy load, the coke ratio is adjusted to a normal level, the furnace condition accepts to complete the air quantity, and in the recovery process of the stage, the air quantity is increased to the normal level once before the coal injection heat effect is not shown;
7) along with the increase of air quantity and the influence of heavy-load materials, the furnace temperature cannot rebound quickly, the control of smelting is strong and smooth, the control is reinforced in operation, the theoretical combustion temperature is adjusted by utilizing the air temperature, when the thermal storage of the furnace hearth is normal, each control parameter tends to be normal, the furnace temperature tends to be stable, and the normal production is carried out.
(III) advantageous effects
Compared with the prior art, the invention provides a method for rapidly recovering the furnace condition, which has the following beneficial effects:
1. according to the method for rapidly recovering the furnace condition, the patented oxygen lance is buried from the iron notch before the blast furnace is opened, so that the blast furnace can rapidly and repeatedly produce iron slag within 6-8 hours, the normal air pressure and the full opening of the tuyere can be recovered within about 24 hours, the furnace condition can be recovered within a short time, and the production can be rapidly achieved.
2. The method for rapidly recovering the furnace condition has the advantages that the air adding speed is high, the load adjusting period is short, the problems that the labor intensity of workers in front of the furnace is high during the furnace opening process, the material consumption is high, the smooth operation, the high yield and the stable yield of the blast furnace are influenced, the safety production is potentially limited, and the consumption of raw fuel is saved through calculation and quantitative operation.
3. The method for rapidly recovering the furnace condition can produce about 600-1000 tons of molten iron each time, can produce about 40 ten thousand yuan at most each time, can save about 50-100 tons of coke each time when the furnace is opened, and can save about 22 ten thousand yuan at most each time according to 2200 yuan/ton.
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 the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: a method of rapidly restoring furnace conditions, comprising the steps of:
1) before the blast furnace condition is recovered, the furnace condition is adjusted before the damping down, the furnace condition is ensured to be stable and smooth, the working condition of a furnace cylinder is good, the distribution of gas flow is reasonable, and in order to rapidly rebuild and manufacture good conditions of the gas flow when the furnace condition is recovered, the temperature of iron is ensured to be not less than 1480 ℃ usually 24 hours before the damping down, the temperature of the furnace is sufficient, 15 tons of coke are intensively added 7 hours before the damping down, the iron number [ Si ] of the last furnace before the damping down is not less than 0.4%, the temperature of the iron is not less than 1480 ℃, the safety of the damping down is improved, 500 tons of coke are added 5 hours before the damping down, then the material light load is changed immediately, 200 tons of coke are intensively added after 10 batches of the light load material, and the damping down time is estimated to be about 240 hours;
2) sealing the furnace body when the furnace body is shut down, immediately replacing the leaking air port after the furnace body is shut down, plugging the air port tightly by using stemming, poking 8 air ports at symmetrical angles every two hours, observing the red hot state of coke at the front end of the air port, and timely finding the water leakage condition of a cooling system above the air port; stopping the high-pressure water pump and the soft water pump one after four hours after the damping down, reducing the water pressure of cooling water, reducing water quantity, ensuring the lowest cooling circulation, keeping normal water temperature difference, reducing the pressure of the bottom of the furnace by water cooling after 24 hours of damping down, and reducing heat loss; in order to quickly reduce the temperature of the furnace top and facilitate the maintenance, the charge level is reduced to 4 meters before damping down, steam is introduced into the furnace top and filled with cold charge after damping down, and finally 4 batches of materials are only added with ore without coke;
3) when the air supply is returned, an oxygen lance is buried from an iron notch before blowing in, the oxygen lance consists of an inner pipe, an outer pipe, a spray head and an oxygen inlet branch pipe, a sealing rubber ring is filled in the inner wall of the outer pipe, the bottom of the outer pipe is connected with a water inlet pipe and a water outlet pipe, the oxygen lance is also provided with a metal hose, a manual ball valve and a pressure gauge, coke is immediately combusted after the air supply of the blast furnace, the air quantity is maintained to be about 20 percent of the normal air quantity, the pressure difference is controlled, the coke is stably combusted, the damage of the two air port sets is avoided as much as possible, and meanwhile, the top temperature is increased as soon as possible to guide coal gas;
4) after air supply is carried out for 6 hours, the safety and the proper air speed of an air port are ensured, the reverse thrust air quantity and the air speed are calculated according to theory, and meanwhile, the standard air speed is properly improved according to the level of the air pressure; while the manganese ore is continuously used for washing the furnace, on the premise of keeping good fluidity of molten iron, opening a tuyere according to the working conditions of a furnace hearth and the tuyere, strictly increasing the top pressure according to a certain proportion according to the standard wind speed of less than or equal to 200m/s, and adding the wind to 80% of the normal wind quantity;
5) after 10 hours of air supply, the air quantity reaches 3800m3Min, raising the standard wind speed to full wind level, in order to prevent wind from being added at the openingThe central gas flow is excessively developed in the process, the ore batch weight is increased successively to improve the slag alkalinity, the burden coke ratio is reduced, and oxygen is properly enriched to 3600m3/h；
6) After the air is re-aerated for 20 hours, the batch weight is increased and oxygen is enriched to 6000m3The furnace temperature will gradually descend, the return air speed can be slowed down according to the situation, the air quantity and the oxygen quantity are increased gradually along with the heavy load, the coke ratio is adjusted to a normal level, the furnace condition accepts to complete the air quantity, and in the recovery process of the stage, the air quantity is increased to the normal level once before the coal injection heat effect is not shown;
7) along with the increase of air quantity and the influence of heavy-load materials, the furnace temperature cannot rebound quickly, the control of smelting is strong and smooth, the control is reinforced in operation, the theoretical combustion temperature is adjusted by utilizing the air temperature, when the thermal storage of the furnace hearth is normal, each control parameter tends to be normal, the furnace temperature tends to be stable, and the normal production is carried out.
Example two: a method of rapidly restoring furnace conditions, comprising the steps of:
1) before the blast furnace condition is recovered, the furnace condition is adjusted before the damping down, the furnace condition is ensured to be stable and smooth, the working condition of a furnace cylinder is good, the distribution of gas flow is reasonable, and in order to rapidly rebuild and manufacture good conditions of the gas flow when the furnace condition is recovered, the temperature of iron is ensured to be not less than 1480 ℃ usually 24 hours before the damping down, the temperature of the furnace is sufficient, 15 tons of coke are intensively added 7 hours before the damping down, the iron number [ Si ] of the last furnace before the damping down is not less than 0.4%, the temperature of the iron is not less than 1480 ℃, the safety of the damping down is improved, 500 tons of coke are added 5 hours before the damping down, then the material light load is changed immediately, 200 tons of coke are intensively added after 10 batches of the light load material, and the damping down time is estimated to be about 240 hours;
2) sealing the furnace body when the furnace body is shut down, immediately replacing the leaking air port after the furnace body is shut down, plugging the air port tightly by using stemming, poking 8 air ports at symmetrical angles every two hours, observing the red hot state of coke at the front end of the air port, and timely finding the water leakage condition of a cooling system above the air port; stopping the high-pressure water pump and the soft water pump one after four hours after the damping down, reducing the water pressure of cooling water, reducing water quantity, ensuring the lowest cooling circulation, keeping normal water temperature difference, reducing the pressure of the bottom of the furnace by water cooling after 24 hours of damping down, and reducing heat loss; in order to quickly reduce the temperature of the furnace top and facilitate the maintenance, the charge level is reduced to 4 meters before damping down, steam is introduced into the furnace top and filled with cold charge after damping down, and finally 4 batches of materials are only added with ore without coke;
3) when the air supply is returned, an oxygen lance is buried from an iron notch before blowing in, the oxygen lance consists of an inner pipe, an outer pipe, a spray head and an oxygen inlet branch pipe, the inner wall of the outer pipe is filled with a sealing rubber ring, the bottom of the outer pipe is connected with a water inlet pipe and a water outlet pipe, and the oxygen lance is also provided with a metal hose, a manual ball valve and a pressure gauge. After the blast furnace supplies air, the coke is immediately combusted, the air quantity is maintained to be about 28 percent of the normal air quantity, the pressure difference is controlled, the coke is stably combusted, the damage of the second tuyere sleeve is avoided as much as possible, and meanwhile, the top temperature is increased as soon as possible to introduce the coal gas early;
4) after air supply is carried out for 6 hours, the safety and the proper air speed of an air port are ensured, the reverse thrust air quantity and the air speed are calculated according to theory, and meanwhile, the standard air speed is properly improved according to the level of the air pressure; while the manganese ore is continuously used for washing the furnace, on the premise of keeping good fluidity of molten iron, opening a tuyere according to the working conditions of a furnace hearth and the tuyere, strictly increasing the top pressure according to a certain proportion according to the standard wind speed of less than or equal to 200m/s, and adding wind to 85% of the normal wind quantity;
5) after 11 hours of air supply, the air quantity reaches 3900m3Min, properly increasing the standard wind speed to the full wind level, sequentially increasing the ore batch weight to increase the slag alkalinity and reduce the burden coke ratio in order to prevent the excessive development of central air flow in the process of blowing air at an air opening, and properly enriching oxygen to 3800m3/h；
6) After the air is re-blown, the batch weight is increased and the oxygen is enriched to 6000m3/h 22 hours later, at the moment, the coal is not sprayed to the normal coal quantity once, the oxygen is enriched properly to reduce the influence of heavy load material emission on a furnace hearth, the furnace temperature gradually descends, the air return speed is slowed down according to the condition, the air quantity and the oxygen quantity are increased gradually along with the heavy load emission, the coke ratio is adjusted to the normal level, the furnace condition accepts to complete the air quantity, and in the recovery process at the stage, before the coal spraying heat effect is not shown, the air quantity is increased to the normal level once.
7) Along with the increase of air quantity and the influence of heavy-load materials, the furnace temperature cannot rebound quickly, the control of smelting is strong and smooth, the control is reinforced in operation, the theoretical combustion temperature is adjusted by utilizing the air temperature, when the thermal storage of the furnace hearth is normal, each control parameter tends to be normal, the furnace temperature tends to be stable, and the normal production is carried out.
Example three: a method of rapidly restoring furnace conditions, comprising the steps of:
1) before the blast furnace condition is recovered, the furnace condition is adjusted before the damping down, the furnace condition is ensured to be stable and smooth, the working condition of a furnace cylinder is good, the distribution of gas flow is reasonable, and in order to rapidly rebuild and manufacture good conditions of the gas flow when the furnace condition is recovered, the temperature of iron is ensured to be not less than 1480 ℃ usually 24 hours before the damping down, the temperature of the furnace is sufficient, 15 tons of coke are intensively added 7 hours before the damping down, the iron number [ Si ] of the last furnace before the damping down is not less than 0.4%, the temperature of the iron is not less than 1480 ℃, the safety of the damping down is improved, 500 tons of coke are added 5 hours before the damping down, then the material light load is changed immediately, 200 tons of coke are intensively added after 10 batches of the light load material, and the damping down time is estimated to be about 240 hours;
2) sealing the furnace body when the furnace body is shut down, immediately replacing the leaking air port after the furnace body is shut down, plugging the air port tightly by using stemming, poking 8 air ports at symmetrical angles every two hours, observing the red hot state of coke at the front end of the air port, and timely finding the water leakage condition of a cooling system above the air port; stopping the high-pressure water pump and the soft water pump one after four hours after the damping down, reducing the water pressure of cooling water, reducing water quantity, ensuring the lowest cooling circulation, keeping normal water temperature difference, reducing the pressure of the bottom of the furnace by water cooling after 24 hours of damping down, and reducing heat loss; in order to quickly reduce the temperature of the furnace top and facilitate the maintenance, the charge level is reduced to 4 meters before damping down, steam is introduced into the furnace top and filled with cold charge after damping down, and finally 4 batches of materials are only added with ore without coke;
3) when the air supply is returned, an oxygen lance is buried from an iron notch before blowing in, the oxygen lance consists of an inner pipe, an outer pipe, a spray head and an oxygen inlet branch pipe, the inner wall of the outer pipe is filled with a sealing rubber ring, the bottom of the outer pipe is connected with a water inlet pipe and a water outlet pipe, and the oxygen lance is also provided with a metal hose, a manual ball valve and a pressure gauge. After the blast furnace supplies air, the coke is immediately combusted, the air quantity is maintained to be about 35 percent of the normal air quantity, the pressure difference is controlled, the coke is stably combusted, the damage of the second tuyere sleeve is avoided as much as possible, and meanwhile, the top temperature is increased as soon as possible to introduce the coal gas early;
4) after air supply is carried out for 6 hours, the safety and the proper air speed of an air port are ensured, the reverse thrust air quantity and the air speed are calculated according to theory, and meanwhile, the standard air speed is properly improved according to the level of the air pressure; while the manganese ore is continuously used for washing the furnace, on the premise of keeping good fluidity of molten iron, opening a tuyere according to the working conditions of a furnace hearth and the tuyere, strictly increasing the top pressure according to a certain proportion according to the standard wind speed of less than or equal to 200m/s, and adding wind to 85% of the normal wind quantity;
5) the air volume reaches 4100m 12 hours after air supply3Min, properly increasing the standard wind speed to the full wind level, increasing the ore batch weight to increase the slag alkalinity, reducing the burden coke ratio and properly enriching oxygen to 4000m in order to prevent the excessive development of central air flow in the process of blowing air at an air opening3/h；
6) After 24 hours of re-air, the batch weight is increased and oxygen is enriched to 6000m3And h, at the moment, the coal is not sprayed to the normal coal quantity once, the influence on the furnace hearth due to heavy-load material emission is reduced by properly enriching oxygen, the furnace temperature gradually descends, the air return speed is slowed down according to the condition, the air quantity and the oxygen quantity are increased gradually along with the heavy load, the coke ratio is adjusted to the normal level, the furnace condition accepts to complete the air quantity, and in the recovery process at the stage, the air quantity is increased to the normal level once before the coal spraying heat effect is not expressed.
7) Along with the increase of air quantity and the influence of heavy-load materials, the furnace temperature cannot rebound quickly, the control of smelting is strong and smooth, the control is reinforced in operation, the theoretical combustion temperature is adjusted by utilizing the air temperature, when the thermal storage of the furnace hearth is normal, each control parameter tends to be normal, the furnace temperature tends to be stable, and the normal production is carried out.
And (4) judging the standard: the third embodiment is the best embodiment by judging the time when each control parameter tends to be normal, the furnace temperature tends to be stable and normal production is started.
The invention has the beneficial effects that: the patent oxygen lance is buried in the blast furnace from the iron notch before the blast furnace is opened, so that the blast furnace can rapidly produce slag iron again within 6-8 hours, the normal air pressure is recovered within about 24 hours, the air port is fully opened, the furnace condition can be recovered within a short time, and the production can be rapidly achieved; the air adding speed is high, the load adjusting period is short, the problems that the labor intensity of workers in front of the blast furnace is high, the material consumption is high, the smooth running, high yield and stable yield of the blast furnace are influenced, the safety production is potentially restricted are avoided, and the consumption of raw fuel is saved through calculation and quantitative operation; the molten iron can be produced by about 600- & ltwbr/& gt and 1000 tons per time, the benefit can be produced by about 40 ten thousand yuan per time at most, the coke can be saved by about 50-100 tons per blow-in, and the coke cost can be saved by about 22 ten thousand yuan per time according to 2200 yuan/ton.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A method for rapidly restoring furnace conditions, comprising the steps of:
1) before the blast furnace condition is recovered, the furnace condition is adjusted before the damping down, the furnace condition is ensured to be stable and smooth, the working condition of a furnace cylinder is good, the distribution of gas flow is reasonable, and in order to rapidly rebuild and manufacture good conditions of the gas flow when the furnace condition is recovered, the temperature of iron is ensured to be not less than 1480 ℃ usually 24 hours before the damping down, the temperature of the furnace is sufficient, 15 tons of coke are intensively added 7 hours before the damping down, the iron number [ Si ] of the last furnace before the damping down is not less than 0.4%, the temperature of the iron is not less than 1480 ℃, the safety of the damping down is improved, 500 tons of coke are added 5 hours before the damping down, then the material light load is changed immediately, 200 tons of coke are intensively added after 10 batches of the light load material, and the damping down time is estimated to be about 240 hours;
2) sealing the furnace body when the furnace body is shut down, immediately replacing the leaking air port after the furnace body is shut down, plugging the air port tightly by using stemming, poking 8 air ports at symmetrical angles every two hours, observing the red hot state of coke at the front end of the air port, and timely finding the water leakage condition of a cooling system above the air port; stopping the high-pressure water pump and the soft water pump one after four hours after the damping down, reducing the water pressure of cooling water, reducing water quantity, ensuring the lowest cooling circulation, keeping normal water temperature difference, reducing the pressure of the bottom of the furnace by water cooling after 24 hours of damping down, and reducing heat loss; in order to quickly reduce the temperature of the furnace top and facilitate the maintenance, the charge level is reduced to 4 meters before damping down, steam is introduced into the furnace top and filled with cold charge after damping down, and finally 4 batches of materials are only added with ore without coke;
3) when the air supply is returned, an oxygen lance is buried in the blast furnace from the iron notch before the blast furnace is opened, coke is immediately combusted after the blast furnace supplies air, the air quantity is maintained to be about 20-35% of the normal air quantity, the pressure difference is controlled, the coke is stably combusted, the damage of the two tuyere sleeves is avoided as much as possible, and meanwhile, the top temperature is increased as soon as possible to lead the coal gas;
4) after air supply is carried out for 6 hours, the safety and the proper air speed of an air port are ensured, the reverse thrust air quantity and the air speed are calculated according to theory, and meanwhile, the standard air speed is properly improved according to the level of the air pressure; while the manganese ore is continuously used for washing the furnace, on the premise of keeping good fluidity of molten iron, opening a tuyere according to the working conditions of a furnace hearth and the tuyere, strictly increasing the top pressure according to a certain proportion according to the standard wind speed of less than or equal to 200m/s, and adding the wind to 80-90% of the normal wind quantity;
5) the air quantity reaches 3800m after 10-12 hours of air supply3/min-41003Min, properly increasing the standard wind speed to the full wind level, sequentially increasing the ore batch weight to increase the slag alkalinity and reduce the burden coke ratio in order to prevent the excessive development of central air flow in the process of blowing air at an air opening, and properly enriching oxygen to 3600m3/h-4000m3/h；
6) After the air is re-ventilated for 20-24 hours, the batch weight is increased and oxygen is enriched to 6000m3The furnace temperature will gradually descend, the return air speed can be slowed down according to the situation, the air quantity and the oxygen quantity are increased gradually along with the heavy load, the coke ratio is adjusted to a normal level, the furnace condition accepts to complete the air quantity, and in the recovery process of the stage, the air quantity is increased to the normal level once before the coal injection heat effect is not shown;
7) along with the increase of air quantity and the influence of heavy-load materials, the furnace temperature cannot rebound quickly, the control of smelting is strong and smooth, the control is reinforced in operation, the theoretical combustion temperature is adjusted by utilizing the air temperature, when the thermal storage of the furnace hearth is normal, each control parameter tends to be normal, the furnace temperature tends to be stable, and the normal production is carried out.
2. The method for rapidly restoring furnace conditions as set forth in claim 1, wherein: the oxygen lance in the step 3 consists of an inner tube, an outer tube, a spray head and an oxygen inlet branch tube, wherein the inner wall of the outer tube is filled with a sealing rubber ring, and the bottom of the outer tube is connected with a water inlet tube and a water outlet tube.
3. A method of rapidly restoring furnace conditions, as defined in claim 2, wherein: the oxygen lance is also provided with a metal hose, a manual ball valve and a pressure gauge.
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