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WO2018180892A1 - Procédé de fonctionnement d'un haut-fourneau - Google Patents

Procédé de fonctionnement d'un haut-fourneau Download PDF

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Publication number
WO2018180892A1
WO2018180892A1 PCT/JP2018/011417 JP2018011417W WO2018180892A1 WO 2018180892 A1 WO2018180892 A1 WO 2018180892A1 JP 2018011417 W JP2018011417 W JP 2018011417W WO 2018180892 A1 WO2018180892 A1 WO 2018180892A1
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Prior art keywords
gas
pipe
lance
blast furnace
combustion
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English (en)
Japanese (ja)
Inventor
尚貴 山本
明紀 村尾
裕之 堀越
亮丞 宮越
晃太 盛家
深田　喜代志
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JFE Steel Corp
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JFE Steel Corp
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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

Definitions

  • the ratio of reducing agent rate (RAR: Abbreviation for Reduction Agent Rate) is the total amount of reducing material injected from the tuyere and coke charged from the top of the furnace per 1 ton of pig iron. ) Is strongly promoted.
  • a mixed reducing material mixed with a solid reducing material and a flammable reducing material and a combustion-supporting gas are mixed from a double-pipe lance whose tip is inserted into a blow pipe that is a hot air flow path.
  • Blast furnace operation method that cools by blowing from the inner pipe and the outer pipe to improve combustibility and regulates the outlet flow velocity in the outer pipe to 20 to 120 m / s so that the double pipe lance is not deformed by heat. is doing.
  • Patent Document 2 the amount of pulverized coal and the amount of gaseous fuel that are blown from the same tuyere are blown with a specific relational expression to improve combustibility and suppress the generation of unburned char.
  • a blast furnace operating method consisting of the following has been proposed.
  • Patent Document 3 when low volatile pulverized coal having an average volatile content of 25 mass% or less is used, the oxygen concentration in the gas blown simultaneously with the pulverized coal is set to 70 vol% in the vicinity of the tip of the pulverized coal blowing lance.
  • a method for improving the combustibility of low-volatile matter pulverized coal in a blast furnace has been proposed, which is ensured as described above or the oxygen concentration in the pulverized coal carrier gas is set to 70 vol% or more.
  • Patent Documents 1 and 2 are effective in improving the combustion temperature of pulverized coal and reducing the basic unit of reducing material compared to the conventional method of blowing only pulverized coal from the tuyere.
  • problems as described below there were problems as described below.
  • Patent Document 2 has a problem in that the positions where pulverized coal and city gas are blown are unclear. In addition, the respective contact properties of pulverized coal, city gas, and oxygen during blowing affect the flammability of pulverized coal, but no particular consideration is given to this point.
  • the oxygen concentration in the gas blown simultaneously with the pulverized coal is controlled to be a certain level or more, but even if the oxygen concentration around the pulverized coal particles is increased, If the temperature cannot be raised to the temperature at which the pulverized coal particles ignite, the combustion reaction will not occur. Therefore, in the combustion of pulverized coal particles, there is a problem that not only the oxygen concentration but also the temperature rise of the pulverized coal particles must be improved at the same time.
  • the present invention has been developed to solve the above-described current situation.
  • the solid reducing material when the solid reducing material is blown from the tuyere through the double pipe lance, two double pipe lances are used. A solid reducing material is injected from the other double pipe lance with a flammable reducing gas and a solid reducing material, respectively.
  • the solid reducing material when the solid reducing material is blown from the tuyere through the double tube lance, one double tube lance is used, and the combustion supporting gas and the solid reducing material are supplied from the double tube lance. Infuse.
  • the gist configuration of the present invention is as follows. 1. Supplying hot air from the hot air pipe to the inside of the blow pipe whose tip is connected to the tuyere of the blast furnace, supplying the hot air from the tuyere into the furnace via the inside of the blow pipe, A first solid reducing material is blown from the inner pipe of the first double pipe lance whose tip is inserted into the blow pipe, and a combustion-supporting gas is blown into the blow pipe simultaneously from the outer pipe.
  • a second solid reducing material is introduced from the inner pipe of the second double pipe lance having a tip inserted into the blow pipe, and a flammable reducing gas is introduced from the outer pipe to the inside of the blow pipe.
  • a blast furnace operating method that is simultaneously blown and supplied into the furnace from the tuyere,
  • the combustion support gas injection index A defined by the following formula (1) is set to 100 or more and 100000 or less, and the combustion index of the flammable reducing gas defined by the following formula (2)
  • any of the above 1-3, wherein the flammable reducing gas is one or more selected from city gas, natural gas, propane gas, hydrogen, converter gas, blast furnace gas, and coke oven gas The blast furnace operating method according to one item.
  • a method for operating a blast furnace characterized in that an injection index A of the combustion-supporting gas defined by the following formula (1) is 100 or more and 100000 or less.
  • V 1 Corrected gas flow velocity (m / s) of the combustion-supporting gas at the tip of the first double pipe lance, calculated by the following equation (3)
  • F 1 Gas flow rate of combustion-supporting gas per lance (Nm 3 / h)
  • V 1 ⁇ (G 1/ 3600) ⁇ (T 1 /273.15) ⁇ (P A / P B) ⁇ / S 1 ⁇ (3)
  • G 1 Gas flow rate of the combustion-supporting gas in the standard state (Nm 3 / h)
  • T 1 Temperature of supporting gas (K)
  • P A Atmospheric pressure (kPa)
  • P B Hot air blowing pressure (kPa)
  • S 1 Cross-sectional area of the combustion-supporting gas in the first double-pipe lance (m 2 ) It is.
  • a blast furnace operating method that is simultaneously blown and supplied into the furnace from the tuyere, A method for operating a blast furnace, characterized in that a flammable reducing gas injection index B defined by the following formula (2) is set to 300 to 100,000.
  • V 2 Corrected gas flow rate (m / s) of the flammable reducing gas at the tip of the second double pipe lance, calculated by the following equation (4)
  • F 2 Gas flow rate of flammable reducing gas per lance (Nm 3 / h)
  • V 2 ⁇ (G 2/ 3600) ⁇ (T 2 /273.15) ⁇ (P A / P B) ⁇ / S 2 ⁇ (4)
  • G 2 Gas flow rate of flammable reducing gas in standard state (Nm 3 / h)
  • T 2 temperature of the flammable reducing gas (K)
  • P A Atmospheric pressure (kPa)
  • P B Hot air blowing pressure (kPa)
  • S 2 Cross-sectional area of the flammable reducing gas in the second double-pipe lance (m 2 ) It is.
  • the flammable reducing gas is one or more selected from city gas, natural gas, propane gas, hydrogen, converter gas, blast furnace gas, and coke oven gas.
  • the flammability of the solid reducing material injected through the lance is improved without affecting the lance, and the blast furnace operation with a low coke ratio and a low reducing material ratio is stably performed. Can do.
  • the present invention takes the following three modes for its implementation.
  • the first and second double pipe lances are used, and the first solid pipe and the combustion-supporting gas are supplied from the first double pipe lance from the second double pipe lance.
  • a method in which only the second double pipe lance is used and the second solid reducing material and the flammable reducing gas are blown from the double pipe lance hereinafter referred to as the third invention).
  • FIG. 1 A combustion experiment for confirming the effect of the first invention was performed using the combustion experiment apparatus shown in FIG.
  • the figure shows the solid reducing material in a balanced manner using two double-pipe lances, each of which is connected to the tip of the blast furnace tuyere, and inside the blow pipe where hot air flows from the hot air pipe.
  • the state which injects property gas, a solid reducing material, and a combustible reducing gas is shown, respectively.
  • pulverized coal 2 was blown from the inner pipe of the first double pipe lance 1 as a first solid reducing material
  • oxygen 3 was blown from the outer pipe as a supporting gas.
  • specifications of pulverized coal per lance are: fixed carbon (FC) 77.8 mass%, volatile matter (VM) 13.6 mass%, ash (Ash) 8.6 mass%
  • the blowing condition was 31.0 kg / h (equivalent to 90 kg per 1 ton of pig iron).
  • the oxygen blowing conditions were a gas temperature (T 1 ) of 20 ° C., a flow rate (F 1 ) of 4.5 to 20 Nm 3 / h, and 19 to 83 kg per ton of pig iron.
  • the city gas blowing conditions were a gas temperature (T 2 ) of 20 ° C., a flow rate (F 2 ) of 0.49 to 5 Nm 3 / h, and 1 to 10 kg per 1 ton of pig iron.
  • the blowing conditions are: blowing temperature 1200 ° C., blowing pressure (P B ) 120 kPa, flow rate 350 Nm 3 / h, flow rate 150 m / s, oxygen enrichment +1.5 vol% (oxygen concentration 22.5 vol%, oxygen concentration in air 21 vol%) And 1.5 vol% enrichment).
  • N 2 gas was used as the carrier gas for the pulverized coal.
  • the atmospheric pressure (P A ) was 101.3 kPa.
  • the evaluation of the experimental results was based on the combustion temperature and dispersibility of pulverized coal in the case of a normal oxygen blowing index and a city gas blowing index (test symbol A).
  • the oxygen injection index A and the city gas injection index B are values defined by the following expressions (1) and (2), respectively.
  • A V 1 ⁇ F 1 (1)
  • B V 2 ⁇ F 2 (2) here,
  • V 1 Corrected gas flow velocity (m / s) of the combustion-supporting gas (oxygen) at the tip of the first double pipe lance, calculated by the following equation (3)
  • F 1 Gas flow rate of combustion-supporting gas (oxygen) per lance (Nm 3 / h)
  • V 2 Corrected gas flow velocity (m / s) of the flammable reducing gas (city gas) at the tip of the second double pipe lance, calculated by the following equation (4)
  • F 2 Gas flow rate of flammable reducing gas (city gas) per lance (Nm 3 / h) Note that the F 1, F 2, the gas flow rate in the pipe connected to the lance was measured by the gas flow meter.
  • each of the oxygen flow rate V 1 and city gas flow velocity V 2 at the lance tip was calculated using (4).
  • V 1 ⁇ (G 1/ 3600) ⁇ (T 1 /273.15) ⁇ (P A / P B) ⁇ / S 1 ⁇ (3)
  • V 2 ⁇ (G 2/ 3600) ⁇ (T 2 /273.15) ⁇ (P A / P B) ⁇ / S 2 ⁇ (4) here
  • G 1 Gas flow rate of combustion-supporting gas (oxygen) in the standard state (Nm 3 / h)
  • G 2 Gas flow rate (Nm 3 / h) of flammable reducing gas (city gas) in the standard state
  • T 1 Temperature of supporting gas (oxygen) (K)
  • T 2 Temperature (K) of flammable reducing gas (city gas)
  • P A Atmospheric pressure (kPa)
  • P B Hot air blowing pressure
  • the combustion temperature was measured using a two-color thermometer, and the dispersibility of pulverized coal was measured using a high-speed camera. In either case, measurement was performed at a position 50 mm from the tip of the double tube lance.
  • the results of examining the relationship are shown in Tables 1 and 2.
  • the dispersibility of the pulverized coal was evaluated by the maximum spread angle ⁇ of the pulverized coal at a position 50 mm from the tip of the double pipe lance as shown in the schematic diagram of FIG. It can be said that the greater the ⁇ , the better the dispersibility of the pulverized coal.
  • the length of the potential core 7, which is a region where oxygen, city gas, and blown gas do not mix, is shortened when the oxygen or city gas blowing index decreases.
  • the dispersibility of the pulverized coal particles is improved, the mixing property of the pulverized coal particles and the blowing gas is improved, the temperature rise of the pulverized coal particles is improved, and finally the combustibility is improved. It is thought that it is done.
  • a lance that blows pulverized coal and oxygen and a lance that blows pulverized coal and city gas are close to each other.
  • the city gas reacts and the city gas burns, causing rapid heating and ignition of the pulverized coal, which further improves the combustibility of both lances. Further, by reducing the amount of pulverized coal by half, the dispersibility of the pulverized coal is also improved, so that the combustibility is further improved.
  • the oxygen blowing index A is set to 100 or more and 100000 or less, and city gas blowing It has been determined that the inclusion index B needs to be 300 or more and 100,000 or less.
  • pulverized coal is advantageously adapted as the first and second solid reducing materials.
  • solid reducing materials such as waste plastics, waste solid fuel, organic resources, and waste materials can be mixed and used in pulverized coal.
  • the mixing amount of the solid reducing material other than pulverized coal is preferably 20 mass% or less.
  • the amount of the solid reducing material blown is preferably 50 to 300 kg per 1 ton of pig iron.
  • oxygen is preferable as the supporting gas, but oxygen-enriched air having oxygen of 22 vol% or more is also advantageously adapted. To do.
  • the oxygen concentration in the supporting gas exceeds the oxygen concentration in the air, the contact property between the pulverized coal and oxygen is improved, and the combustibility is improved.
  • the amount of the gas to be supported is preferably 9 to 370 kg per ton of pig iron.
  • the flammable reducing gas includes natural gas, propane gas, hydrogen, converter gas, blast furnace gas, coke oven as well as the above-mentioned city gas. Gas and the like are advantageously suitable.
  • the amount of the flammable reducing gas blown is preferably 0.1 to 50 kg per ton of pig iron. More preferably, it is 10 kg / t-pig iron or less.
  • the blown gas also referred to as hot air
  • a gas passing through the hot stove is usually used. Is done. Accordingly, the blowing temperature and blowing pressure indicate the gas temperature and gas pressure of the gas passing through the hot stove.
  • FIG. 1 shows a case where only the first double pipe lance 1 is used in the combustion experiment of the first invention shown in FIG. 1, and the fine powder is used as the first solid reducing material from the inner pipe of the double pipe lance 1.
  • Oxygen 3 was blown in as charcoal 2 and as a supporting gas from the outer tube.
  • various double-pipe lances with different cross-sectional areas of the flow passage gap were prepared and injected in order to change the flow rate with the same oxygen flow rate.
  • the specifications of pulverized coal are 77.8 mass% of fixed carbon (FC), 13.6 mass% of volatile matter (VM), 8.6 mass% of ash (Ash), and blowing conditions.
  • FC fixed carbon
  • VM volatile matter
  • Ash 8.6 mass% of ash
  • blowing conditions were 62.0 kg / h (equivalent to 180 kg per ton of pig iron).
  • the oxygen blowing conditions were a gas temperature (T 1 ) of 20 ° C., a flow rate (F 1 ) of 4.5 to 20 Nm 3 / h, and 19 to 83 kg per ton of pig iron.
  • blowing conditions are: blowing temperature 1200 ° C., blowing pressure (P B ) 120 kPa, flow rate 350 Nm 3 / h, flow rate 150 m / s, oxygen enrichment +1.5 vol% (oxygen concentration 22.5 vol%, oxygen concentration in air 21 vol%) And 1.5 vol% enrichment).
  • N 2 gas was used as the carrier gas for the pulverized coal.
  • the atmospheric pressure (P A ) was 101.3 kPa.
  • the oxygen injection index A is a value defined by the following equation (1).
  • A V 1 ⁇ F 1 (1) here,
  • V 1 Corrected gas flow velocity (m / s) of the combustion-supporting gas (oxygen) at the tip of the first double pipe lance, calculated by the following equation (3)
  • F 1 Gas flow rate of combustion-supporting gas (oxygen) per lance (Nm 3 / h)
  • the oxygen flow velocity V 1 at the tip of the lance was calculated using the following equation (3) corrected by the oxygen gas temperature and the blowing pressure.
  • V 1 ⁇ (G 1/ 3600) ⁇ (T 1 /273.15) ⁇ (P A / P B) ⁇ / S 1 ⁇ (3)
  • G 1 Gas flow rate of combustion-supporting gas (oxygen) in the standard state (Nm 3 / h)
  • T 1 Temperature of supporting gas (oxygen)
  • K P A : Atmospheric pressure (kPa)
  • P B Hot air blowing pressure (kPa)
  • S 1 Cross-sectional area (m 2 ) of the combustion-supporting gas (oxygen) in the first double-pipe lance
  • the combustion temperature was measured at a position 50 mm from the tip of the double tube lance using a two-color thermometer. Further, the dispersibility of the pulverized coal was evaluated by the maximum spread angle ⁇ of the pulverized coal at a position 50 mm from the tip of the double pipe lance using a high-speed camera.
  • Table 3 shows the results of examining the relationship between the oxygen injection index A, the combustibility, and the dispersibility of the pulverized coal when the combustion experiment was performed with various changes in the oxygen injection conditions as described above. Shown in The overall evaluation is indicated by ⁇ when the combustion temperature and dispersibility are both about the same as the case of 110000 (No. 1), which is a normal oxygen blowing index, and by ⁇ when it is improved. Table 3 also shows the results of examining the relationship between the oxygen blowing index A, the lance surface temperature, and the presence / absence of lance melting in the above combustion experiment. The surface temperature at the tip of the lance was measured with a thermoviewer.
  • the oxygen blowing index A needs to be 100 or more and 100,000 or less. confirmed.
  • FIG. 1 shows a case where only the second double pipe lance 4 is used in the combustion experiment of the first invention shown in FIG. 1, and the fine powder is used as the second solid reducing material from the inner pipe of the double pipe lance 4.
  • Charcoal 5 and city gas 6 were blown from the outer pipe as flammable reducing gas.
  • this combustion experiment since the flow rate of the city gas was the same and the flow rate was changed, various double pipe lances with different cross-sectional areas of the flow passage gaps were prepared and injected.
  • the specifications of pulverized coal are 77.8 mass% of fixed carbon (FC), 13.6 mass% of volatile matter (VM), 8.6 mass% of ash (Ash), and blowing conditions.
  • FC fixed carbon
  • VM volatile matter
  • Ash 8.6 mass% of ash
  • blowing conditions was 62.0 kg / h (equivalent to 180 kg per ton of pig iron).
  • the city gas was injected under the conditions of a gas temperature (T 2 ) of 20 ° C., a flow rate (F 2 ) of 0.49 to 5 Nm 3 / h, and 10 kg per ton of pig iron.
  • blowing conditions are: blowing temperature 1200 ° C., blowing pressure (P B ) 120 kPa, flow rate 350 Nm 3 / h, flow rate 150 m / s, oxygen enrichment +5.5 vol% (oxygen concentration 26.5 vol%, air oxygen concentration 21 vol%) On the other hand, it was 5.5 vol% enrichment).
  • N 2 gas was used as the carrier gas for the pulverized coal.
  • the atmospheric pressure (P A ) was 101.3 kPa.
  • the city gas injection index B is a value defined by the following equation (2).
  • B V 2 ⁇ F 2 (2) here
  • V 2 Corrected gas flow velocity (m / s) of the flammable reducing gas (city gas) at the tip of the second double pipe lance, calculated by the following equation (4)
  • F 2 Gas flow rate of flammable reducing gas (city gas) per lance (Nm 3 / h)
  • V 2 ⁇ (G 2/ 3600) ⁇ (T 2 /273.15) ⁇ (P A / P B) ⁇ / S 2 ⁇ (4) here, G 2 : Gas flow rate (Nm 3 / h) of flammable reducing gas (city gas) in the standard state T 2 : Temperature (K) of flammable reducing gas (city gas) P A : Atmospheric pressure (kPa) P B : Hot air blowing pressure (kPa) S 2 : Channel cross-sectional area (m 2 ) of flammable reducing gas (city gas) in the second double pipe lance
  • the combustion temperature was measured at a position 50 mm from the tip of the double tube lance using a two-color thermometer. Further, the dispersibility of the pulverized coal was evaluated by the maximum spread angle ⁇ of the pulverized coal at a position 50 mm from the tip of the double pipe lance using a high-speed camera.
  • Table 4 shows the results of examining the relationship between the city gas injection index B and the combustibility and dispersibility of the pulverized coal when the combustion experiment was performed by variously changing the gas gas injection conditions.
  • Table 4 shows the case where both the combustion temperature and dispersibility are about the same as the case of 110000 which is a normal city gas injection index (No. 21)
  • ⁇ the case where it is improved is indicated by ⁇ .
  • Table 4 also shows the results of examining the relationship between the city gas injection index B, the lance surface temperature, and the presence or absence of lance melting in the above combustion experiment. The surface temperature at the tip of the lance was measured with a thermoviewer.
  • the reason for this is presumed that, as shown in FIG. 4, when the city gas injection index decreases, the length of the potential core 7, which is a region where the city gas and the blown gas are not mixed, is shortened.
  • the length of the potential core 7 is shortened, the dispersibility of the pulverized coal particles is improved, the mixing property of the pulverized coal particles and the blowing gas is improved, the temperature rise of the pulverized coal particles is improved, and finally the combustibility is improved. It is thought that it is done.
  • the third invention using only city gas since the city gas is a flammable gas and is superior to oxygen in terms of ignitability, the coke ratio is further reduced than in the second invention using only oxygen. Can do.
  • Example 1 In blast furnace having an inner volume of 5000 m 3 with tuyeres 38 present, the target pig iron production 11500t / day, pulverized coal ratio 150 kg / t-pig iron, inclusive oxygen flow from an oxygen blowing lance weight 74 kg / t-pig iron, city gas blown The experiment was conducted under the conditions of a city gas blowing rate of 10 kg / t-pig iron, oxygen, and a city gas temperature of 20 ° C., a blowing temperature of 1200 ° C., a blowing pressure of 520 kPa, and a blowing oxygen enrichment + 1.5 vol%.
  • the coke ratio was 370 kg / t-pig iron when either or both of the oxygen injection index A and the city gas injection index B were 110,000 or 105000 lances.
  • both the index A and the index B use a lance of 100,000, 368 kg / t-pig iron, and when the index A and the index B use a lance of 10,000,100,000, respectively, 367 kg / t- pig iron
  • 366 kg / t-pig iron when both the index A and index B use 10,000 lances, 365 kg / t- pig iron 363 kg / t-pig iron when A and B have 100 and 300 lances, respectively In was reduced.
  • the length of the potential core at the tip of the lance is reduced by adjusting the oxygen injection index A and the city gas injection index B to a predetermined range according to the first invention, and the pulverized coal particles and the blast It has been found that the miscibility with oxygen in the gas, and hence the combustibility, is improved, and as a result, a reduction in the coke ratio and reducing material ratio is achieved. Moreover, as a result of taking out each lance after the operation when the lances having oxygen injection index A and city gas injection index B of 100,300 were used and examining the tip of the lance, no deformation or erosion was observed. .
  • the blast furnace operation with the above-mentioned low coke ratio and low reducing material ratio is performed. It was confirmed that it could be implemented stably without adversely affecting the lance.
  • Example 2 In a blast furnace with an inner volume of 5000 m 3 with 38 tuyere, target pig iron production of 11500 t / day, pulverized coal ratio of 150 kg / t-pig iron, oxygen temperature of 20 ° C. when oxygen is blown from the lance, oxygen blow quantity of 74 kg The experiment was conducted under the conditions of / t-pig iron, air blowing temperature 1200 ° C., air blowing pressure 520 kPa, air blowing oxygen enrichment + 1.5 vol%.
  • the coke ratio when using a lance with an oxygen injection index A of 110000 or 105000, the coke ratio was 375 kg / t-pig iron, whereas when using a lance with an index A of 100,000 In the case of using a lance with 374 kg / t-pig iron and index A of 10,000, the coke ratio is reduced to 373 kg / t-pig iron and when using a lance with index A of 100, the coke ratio is reduced to 372 kg / t-pig iron. did.
  • the length of the potential core at the tip of the lance is reduced by adjusting the oxygen injection index A to a predetermined range according to the second invention, and mixing of the pulverized coal particles and oxygen in the blowing gas As a result, it has been found that the coke ratio and the reducing material ratio are reduced. Further, as a result of examining the tip of the lance after taking out the lance after the operation in the case where the lance having the oxygen blowing index A of 100 was used, no deformation or damage was found.
  • the above-mentioned blast furnace operation with a low coke ratio and a low reducing material ratio can be performed without adversely affecting the lance. It was confirmed that it could be carried out stably.
  • Example 3 In a blast furnace with an inner volume of 5000 m 3 with 38 tuyere, target pig iron production of 11500 t / day, pulverized coal ratio of 150 kg / t-pig iron, city gas injection from the lance of 10 kg / t-pig iron, city gas temperature of 20 The experiment was performed under the conditions of a blast temperature of 1200 ° C., a blast pressure of 520 kPa, and a blast oxygen enrichment of 5.5 vol%.
  • the coke ratio was 373 kg / t-pig iron, whereas the lance with index B of 100,000 was used.
  • the coke ratio is 371 kg / t-pig iron
  • the coke ratio is up to 370 kg / t-pig iron. Reduced.
  • the third invention by adjusting the city gas injection index B to a predetermined range, the length of the potential core at the tip of the lance is reduced, and the pulverized coal particles and the oxygen in the blowing gas are reduced. It has been found that the mixability and thus the flammability is improved, so that a reduction in the coke ratio and reducing material ratio is achieved. Moreover, as a result of taking out the lance after the operation when the lance having the city gas injection index B of 300 was used and examining the tip of the lance, no deformation or erosion was observed.
  • the above-mentioned blast furnace operation with a low coke ratio and a low reducing material ratio does not adversely affect the lance. It was confirmed that it can be carried out stably.

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

Cette invention concerne un procédé de fonctionnement d'un haut-fourneau, consistant à fournir de l'air chaud à partir d'un tuyau d'air chaud à l'intérieur d'une lance à soufflage dont la pointe est reliée à une tuyère d'un haut-fourneau, l'air chaud est fourni à l'intérieur du haut-fourneau à partir de la tuyère à travers l'intérieur de la lance à soufflage, un premier agent réducteur solide est soufflé à partir d'un tuyau intérieur d'une première lance à double tuyau dont la pointe est insérée à l'intérieur de la lance à soufflage et un gaz de support de combustion est soufflé à partir d'un tuyau extérieur de la première lance à double tuyau simultanément à l'intérieur de la lance à soufflage de façon à fournir celui-ci à l'intérieur du fourneau à partir de la tuyère, et un second agent réducteur solide est soufflé à partir d'un tuyau intérieur d'une seconde lance à double tuyau dont la pointe est insérée à l'intérieur de la lance à soufflage et un gaz réducteur facilement combustible est soufflé à partir d'un tuyau extérieur de la seconde lance à double tuyau simultanément à l'intérieur de la lance à soufflage, de façon à fournir celui-ci à l'intérieur du fourneau à partir de la tuyère, le procédé étant caractérisé en ce que l'indice A pour le soufflage du gaz de support de combustion défini par l'équation (1) est réglé de 100 à 100 000, et l'indice B pour le soufflage du gaz réducteur facilement combustible défini par l'équation (2) est réglé de 300 à 100 000. A = V1 x F1 ... (1), B = V2 x F2 ... (2)
PCT/JP2018/011417 2017-03-30 2018-03-22 Procédé de fonctionnement d'un haut-fourneau Ceased WO2018180892A1 (fr)

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JP2017068423 2017-03-30
JP2017-068423 2017-03-30
JP2017068417 2017-03-30
JP2017068406 2017-03-30
JP2017-068406 2017-03-30
JP2017-068417 2017-03-30

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CN115595389A (zh) * 2022-10-25 2023-01-13 上海大学（Cn） 一种高炉氢气和生物质颗粒耦合喷吹系统及方法
WO2024103122A1 (fr) * 2022-11-17 2024-05-23 Newsouth Innovations Pty Limited Co-injection d'hydrogène et de biomasse dans la fabrication de fer pour la décarbonisation

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CN115595389B (zh) * 2022-10-25 2023-12-08 上海大学 一种高炉氢气和生物质颗粒耦合喷吹系统及方法
WO2024103122A1 (fr) * 2022-11-17 2024-05-23 Newsouth Innovations Pty Limited Co-injection d'hydrogène et de biomasse dans la fabrication de fer pour la décarbonisation

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