WO2021107091A1 - Procédé de fonctionnement de haut fourneau - Google Patents

Procédé de fonctionnement de haut fourneau Download PDF

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Publication number
WO2021107091A1
WO2021107091A1 PCT/JP2020/044217 JP2020044217W WO2021107091A1 WO 2021107091 A1 WO2021107091 A1 WO 2021107091A1 JP 2020044217 W JP2020044217 W JP 2020044217W WO 2021107091 A1 WO2021107091 A1 WO 2021107091A1
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Prior art keywords
amount
gas
hydrogen
temperature
containing gas
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PCT/JP2020/044217
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English (en)
Japanese (ja)
Inventor
酒井　博
中野　薫
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日本製鉄株式会社
Ｊｆｅスチール株式会社
株式会社神戸製鋼所
日鉄エンジニアリング株式会社
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Application filed by 日本製鉄株式会社, Ｊｆｅスチール株式会社, 株式会社神戸製鋼所, 日鉄エンジニアリング株式会社 filed Critical 日本製鉄株式会社
Priority to BR112022010162A priority Critical patent/BR112022010162A2/pt
Priority to AU2020393659A priority patent/AU2020393659B2/en
Priority to CN202080083068.4A priority patent/CN114787391B/zh
Priority to CA3161120A priority patent/CA3161120A1/fr
Priority to US17/779,384 priority patent/US20220403477A1/en
Priority to JP2021561541A priority patent/JP7297091B2/ja
Priority to EP20894471.0A priority patent/EP4067510A4/fr
Priority to KR1020227020856A priority patent/KR20220099573A/ko
Publication of WO2021107091A1 publication Critical patent/WO2021107091A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/007—Controlling or regulating of the top pressure
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B2005/005—Selection or treatment of the reducing gases

Definitions

  • the present invention relates to a method of operating a blast furnace.
  • the present application claims priority based on Japanese Patent Application No. 2019-216568 filed in Japan on November 29, 2019 and Japanese Patent Application No. 2020-92467 filed in Japan on May 27, 2020. The contents are used here.
  • the blast furnace method is the mainstream of the pig iron manufacturing process.
  • iron-based raw materials for blast furnaces raw materials containing iron oxide, mainly sintered ore, hereinafter simply referred to as "iron-based raw materials”
  • coke are alternately and layered in the blast furnace from the top of the blast furnace.
  • hot air is blown into the blast furnace from the tuyere at the bottom of the blast furnace.
  • the hot air reacts with the pulverized coal blown together with the hot air and the coke in the blast furnace to generate a high-temperature reducing gas (mainly CO gas in this case). That is, the hot air gasifies coke and pulverized coal.
  • a high-temperature reducing gas mainly CO gas in this case
  • the reducing gas rises in the blast furnace and reduces the iron-based raw material while heating it.
  • the iron-based raw material is heated and reduced by the reducing gas while descending in the blast furnace. After that, the iron-based raw material is melted and dropped in the blast furnace while being further reduced by coke.
  • the iron-based raw material is finally stored in the hearth as hot metal (pig iron) containing a little less than 5% by mass of carbon.
  • the hot metal in the hearth is taken out from the hot metal outlet and used for the next steelmaking process. Therefore, in the blast furnace method, a charcoal material such as coke and pulverized coal is used as a reducing material.
  • the reducing agent has the role of raising the temperature of the charged material as heat in the furnace and the role of reducing the iron-based raw material in the furnace.
  • the reduction reaction in the furnace can be expressed by various reaction formulas.
  • the direct reduction reaction by coke (reaction formula: FeO + C ⁇ Fe + CO) is an endothermic reaction accompanied by a large endothermic reaction. Therefore, it is important to prevent this reaction from occurring as much as possible in order to reduce the ratio of reducing agents.
  • this direct reduction reaction occurs in the lower part of the blast furnace, if the iron-based raw material can be sufficiently reduced with a reducing gas such as CO and H 2 by the time the iron-based raw material reaches the lower part of the furnace, the direct reduction reaction will occur.
  • the target iron-based raw materials can be reduced.
  • a reducing gas with the hot air from tuyere H 2 gas, COG (Cokes Oven Gas), natural gas, city gas, etc.
  • H 2 gas, COG Cokes Oven Gas
  • natural gas city gas, etc.
  • a technique for improving the reducing gas potential in the furnace by injecting When the reducing gas becomes a carbon-containing reducing gas (a reducing gas containing carbon atoms in the molecular structure of the gas, for example, a hydrocarbon gas), the carbon atoms in the carbon-containing gas become CO gas in the blast furnace, and the iron-based raw material is reduced. To do.
  • the reducing gas becomes hydrogen gas (H 2 gas)
  • the hydrogen gas reduces the iron-based raw material.
  • carbon and hydrogen mean carbon atoms and hydrogen atoms, respectively.
  • the present invention has been made in view of the above problems, and an object of the present invention is to blow a high-concentration hydrogen-containing gas as a reduction gas blown from a tuyere while maintaining stable blast furnace operation. It is an object of the present invention to provide a new and improved method of operating a blast furnace capable of increasing the filling amount and further reducing the CO 2 emission.
  • a high-concentration hydrogen-containing gas containing 80 mol% or more of hydrogen gas is blown into a high-concentration hydrogen-containing gas at a temperature of room temperature or higher and 300 ° C. or lower. and conditions blowing amount of the hydrogen gas in the high concentration hydrogen-containing gas is less than 200 Nm 3 / t or more 500 Nm 3 / t, and the blowing temperature of the high concentration hydrogen-containing gas is 300 ° C. ultra 600 ° C.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is 110 Nm under the condition that the amount of hydrogen gas blown is 125 Nm 3 / t or more, the temperature of the high-concentration hydrogen-containing gas is more than 900 ° C. and 1200 ° C. or less.
  • the blowing temperature of the high-concentration hydrogen-containing gas is room temperature or higher and 300 ° C. or lower, and the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is 200 Nm 3 / t or higher and 300 Nm 3 / t or lower. May be good.
  • the blowing temperature of the high-concentration hydrogen-containing gas is more than 300 ° C. and 600 ° C. or less, and the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is 145 Nm 3 / t or more and 600 Nm 3 / t or less. May be good.
  • the temperature in front of the tuyere may be 2050 ° C. or lower.
  • the temperature in front of the tuyere may be more than 2050 ° C and 2150 ° C or less.
  • the temperature in front of the tuyere may be more than 2150 ° C and 2250 ° C or less.
  • blowing temperature of the high-concentration hydrogen-containing gas may be more than 600 ° C and 1400 ° C or less.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas may be 1000 Nm 3 / t or less.
  • the temperature before the tuyere is set to 2050 ° C. It may be as follows.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas and carbon when the blow-in temperature of the high-concentration hydrogen-containing gas containing 80 mol% or more of hydrogen gas is a predetermined value.
  • the hydrogen in high-concentration hydrogen-containing gas which is the correlation with the carbon consumption parameter related to the consumption amount, is obtained in advance for each tuyere temperature, and the carbon consumption is reduced compared to the current operation.
  • a method for operating a blast furnace is characterized in that the amount of gas blown is determined based on the amount of blown-carbon consumption parameter correlation, and high-concentration hydrogen-containing gas is blown from the tuyere at the determined amount of blown hydrogen. Provided.
  • the hydrogen gas injection amount-carbon consumption parameter correlation in the high-concentration hydrogen-containing gas may be obtained for each injection temperature of the high-concentration hydrogen-containing gas.
  • the blowing amount which is the correlation between the blowing amount of the hydrogen gas in the high-concentration hydrogen-containing gas and the change amount of the pressure loss with respect to the base operation In a high-concentration hydrogen-containing gas in which the correlation of the amount of change in pressure loss is obtained in advance for each tuyere temperature, the carbon consumption is reduced compared to the current operation, and the amount of change in pressure loss is within a predetermined range.
  • the amount of hydrogen gas blown in may be determined based on the blown amount-carbon consumption parameter correlation and the blown amount-pressure loss change amount correlation.
  • the blowing amount of the hydrogen gas in the high-concentration hydrogen-containing gas is correlated with the change amount of the furnace top gas temperature with respect to the base operation.
  • the correlation between the amount and the amount of change in the temperature of the top gas is obtained in advance for each tuyere temperature, and the carbon consumption is reduced compared to the current operation, and the amount of change in the top gas temperature is within the specified range.
  • the blown amount of hydrogen gas in the high-concentration hydrogen-containing gas may be determined based on the blown amount-carbon consumption parameter correlation and the blown amount-furnace top gas temperature change amount correlation.
  • the amount of high-concentration hydrogen-containing gas blown from the tuyere is increased while maintaining stable blast furnace operation, and the amount of CO 2 emissions is further increased. It is possible to reduce it.
  • the numerical range represented by using “-" means a range including the numerical values before and after "-" as the lower limit value and the upper limit value.
  • the "reducing agent ratio" is the total mass of the reducing agents required to produce 1 ton of hot metal. Therefore, the reducing agent ratio is basically the total mass of coke and pulverized coal required to produce 1 ton of hot metal, and the mass of the carbon-containing reducing gas in the high-concentration hydrogen-containing gas is included in the reducing agent ratio. It is treated as something that cannot be done.
  • the "carbon consumption intensity (Input C)” is the carbon required to produce 1 ton of hot metal (that is, the amount of carbon consumed per ton of hot metal).
  • the present inventor has focused on a high-concentration hydrogen-containing gas as a reducing gas.
  • the high-concentration hydrogen-containing gas in the present embodiment means a gas containing 80 mol% or more of hydrogen gas (mol% of hydrogen gas with respect to the total amount of substances of all the gases constituting the high-concentration hydrogen-containing gas). .. Pure hydrogen gas (gas having a hydrogen gas concentration of 100 mol%) is included in the high-concentration hydrogen-containing gas.
  • the present inventor paid attention to the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas (hereinafter, also simply referred to as the amount of blown hydrogen) and the blowing temperature of the high-concentration hydrogen-containing gas.
  • the reduction reaction of an iron-based raw material by hydrogen gas in a high-concentration hydrogen-containing gas is an endothermic reaction.
  • the present inventors have conducted a detailed study on the above matters. Specifically, the composition of various gases such as hydrogen gas and CO gas in the high-concentration hydrogen-containing gas and the reduction reaction rate of the high-concentration hydrogen-containing gas at various blowing temperatures are grasped, and the reduction of these gases is performed. The effect of the furnace temperature, which changes due to the reaction heat, on the reduction reaction rate and the effect of the gas composition, which changes due to the reduction reaction, on the reduction reaction rate are grasped, and then the amount of heat is such that the reduction reaction rate does not decrease. Grasp was done for the entire reactor.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas when the reduction rate of the carbon consumption intensity is relaxed and starts to decrease differs depending on the blowing temperature of the high-concentration hydrogen-containing gas.
  • the blowing temperature of the high-concentration hydrogen-containing gas exceeds 600 ° C.
  • the reduction rate Input ⁇ C of the carbon consumption intensity tends to increase as the blowing amount increases.
  • the reduction rate of carbon consumption intensity, Input ⁇ C becomes, for example, 7% or more.
  • CO 2 emissions can be significantly reduced by blowing the amount of high-concentration hydrogen-containing gas blown into the blast furnace, which is determined according to the amount of hydrogen gas blown in this appropriate range.
  • the reduction rate of carbon consumption intensity during operation of the blast furnace can be set to 7% or more, and CO 2 emissions can be significantly reduced.
  • the high-concentration hydrogen-containing gas is a gas containing 80 mol% or more of hydrogen gas as described above.
  • the high-concentration hydrogen-containing gas includes pure hydrogen gas.
  • the high-concentration hydrogen-containing gas includes gases other than hydrogen gas, such as the above-mentioned carbon-containing reducing gas (for example, hydrocarbon gas), CO gas, CO 2 gas, H 2 O gas, N 2 gas and the like. May be good. However, the total concentration of other gases is less than 20 mol%.
  • Gases having a total concentration of 20 mol% or more of other gases are not included in the high-concentration hydrogen-containing gas in the present embodiment. This is because when the concentration of the other gas is 20 mol% or more, the amount of CO 2 gas reduction is greatly reduced.
  • the concentration of the other gas is 20 mol% or more, the amount of CO 2 gas reduction is greatly reduced.
  • hydrocarbon gas, CO 2 gas, and H 2 O gas cause an endothermic reaction when they are decomposed at the tuyere tip, so that the reduction efficiency in the blast furnace is lowered. Therefore, the amount of iron-based raw materials that reach the lower part of the blast furnace without being reduced increases. Therefore, the amount of direct reduction reaction by coke increases. Therefore, since a large amount of reducing agent is required to maintain the temperature in the blast furnace, the amount of CO 2 gas reduction is greatly reduced.
  • the blowing temperature of the high-concentration hydrogen-containing gas is determined within the range of room temperature or higher.
  • FIG. 1 is a diagram for explaining the blowing temperature.
  • the temperature of the high-concentration hydrogen-containing gas is adjusted, for example, in a gas tank 3 provided with a heater 5. That is, the high-concentration hydrogen-containing gas is heated by the heater 5 in the gas tank 3 or remains unheated at room temperature, and the tuyere 2 for blowing hot air provided in the lower part of the blast furnace 1 is provided. Will be sent to.
  • the high-concentration hydrogen-containing gas sent to the tuyere 2 can be blown into the blast furnace 1 from the tuyere 2.
  • the high-concentration hydrogen-containing gas sent to the tuyere 2 is mixed (merged) with the hot air generated in the hot air furnace 4 and then blown into the blast furnace 1 from the tuyere 2.
  • the blowing temperature is the temperature of the high-concentration hydrogen-containing gas immediately before being mixed with the hot air when it is blown into the blast furnace 1 from the tuyere 2.
  • the set temperature of the heater 5 can be set as the blowing temperature. ..
  • the temperature of the high-concentration hydrogen-containing gas rises due to the mixing of the hot air and the high-concentration hydrogen-containing gas, but the temperature at this time is not the blowing temperature in the present embodiment. Further, although Patent Document 1 describes the blowing temperature, the blowing temperature of Patent Document 1 is different from the blowing temperature in the present embodiment.
  • FIG. 2 is a graph showing the correlation between the amount of pure hydrogen gas blown at room temperature and the reduction rate of carbon consumption intensity Input ⁇ C for each tuyere temperature Tf. This graph is obtained by blast furnace operation simulation. Details will be described in Examples, but here, Koji TAKATANI, Takanobu INADA, Yutaka UJISAWA, "Three-dimensional Dynamic Simulation for Blast Furnace", ISIJ International. 39 (1999), No. 1, p. The so-called "blast furnace mathematical model” shown in 15-22 and the like was used.
  • This blast furnace mathematical model roughly defines a plurality of meshes (small regions) by dividing the internal region of the blast furnace into the height direction, the radial direction, and the circumferential direction, and simulates the behavior of each mesh. is there.
  • the simulation conditions were the same as in the examples described later.
  • the reduction rate of carbon consumption intensity can be set to 7% or more, for example. ..
  • the reduction rate of carbon consumption intensity Input ⁇ C is preferably 8% or more.
  • the "room temperature" in the present embodiment means a non-heated state, and specifically, the temperature is 5 ° C. or higher and 35 ° C. or lower.
  • FIG. 3 is a graph showing the correlation between the amount of pure hydrogen gas blown at 300 ° C. and the reduction rate of carbon consumption intensity Input ⁇ C for each tuyere temperature Tf.
  • FIG. 4 is a graph showing the correlation between the amount of pure hydrogen gas blown at 350 ° C. and the reduction rate Input ⁇ C of the carbon consumption intensity.
  • FIG. 5 is a graph showing the correlation between the amount of pure hydrogen gas blown at 600 ° C.
  • FIG. 6 is a graph showing the correlation between the amount of pure hydrogen gas blown at 650 ° C. and the reduction rate Input ⁇ C of the carbon consumption intensity.
  • FIG. 7 is a graph showing the correlation between the amount of pure hydrogen gas blown at 900 ° C. and the reduction rate of carbon consumption intensity Input ⁇ C for each tuyere temperature Tf.
  • FIG. 8 is a graph showing the correlation between the amount of pure hydrogen gas blown at 950 ° C. and the reduction rate Input ⁇ C of the carbon consumption intensity.
  • FIG. 9 is a graph showing the correlation between the amount of pure hydrogen gas blown at 1200 ° C.
  • FIG. 10 is a graph showing the correlation between the amount of pure hydrogen gas blown at 1250 ° C. and the reduction rate Input ⁇ C of the carbon consumption intensity.
  • the blowing temperature of the high-concentration hydrogen-containing gas it is preferable to increase the blowing temperature of the high-concentration hydrogen-containing gas. Specifically, it is preferable to determine the blowing temperature in the range of more than 300 ° C., more preferably in the range of more than 600 ° C., and more preferably in the range of more than 900 ° C.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is determined.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is the flow rate per ton of the hot metal of the hydrogen gas in the high-concentration hydrogen-containing gas blown into the blast furnace from the tuyere, and the unit is Nm 3 /. t.
  • the high-concentration hydrogen-containing gas is pure hydrogen gas
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is equal to the amount of high-concentration hydrogen-containing gas blown.
  • the high-concentration hydrogen-containing gas is a mixed gas containing a gas other than hydrogen gas
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is in units of mol%. It is the amount obtained by multiplying the amount by the ratio of hydrogen gas.
  • high-concentration hydrogen is obtained from the value indicated by the flow meter provided at the outlet of the high-concentration hydrogen-containing gas supply source (for example, a gas tank) and the ratio of hydrogen gas in the high-concentration hydrogen-containing gas in units of mol%. Calculate the amount of hydrogen gas blown into the contained gas.
  • the blowing amount is determined for each case according to the blowing temperature of the high-concentration hydrogen-containing gas. Specifically, when the blowing temperature is room temperature to 300 ° C., the blowing amount of hydrogen gas in the high-concentration hydrogen-containing gas is determined within the range of 200 to 500 Nm 3 / t. On the other hand, when the blowing temperature is more than 300 ° C. and 600 ° C. or lower, the blowing amount of hydrogen gas in the high-concentration hydrogen-containing gas is determined within the range of 145 Nm 3 / t. When the blowing temperature of the high-concentration hydrogen-containing gas is more than 600 ° C. and 900 ° C.
  • the blowing amount of the high-concentration hydrogen-containing gas is determined within the range of 125 Nm 3 / t or more.
  • the blowing temperature of the high-concentration hydrogen-containing gas is more than 900 ° C. and 1200 ° C. or lower, the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is determined within the range of 110 Nm 3 / t or more.
  • the blowing temperature of the high-concentration hydrogen-containing gas exceeds 1200 ° C., the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is determined within the range of 100 Nm 3 / t or more.
  • the suitable blowing amount differs slightly depending on the blowing temperature.
  • the high-concentration hydrogen-containing gas is pure hydrogen gas
  • the high-concentration hydrogen-containing gas contains a gas other than hydrogen gas. Even in this case, the correlation between the blowing temperature of the high-concentration hydrogen-containing gas and the suitable blowing amount does not change.
  • the reduction rate of carbon consumption intensity, Input ⁇ C can be set to 7% or more. It will be possible.
  • the high-concentration hydrogen-containing gas becomes pure hydrogen gas
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is the amount of high-concentration hydrogen-containing gas blown, but the high-concentration hydrogen-containing gas is hydrogen.
  • this value is the amount obtained by multiplying the amount of high-concentration hydrogen-containing gas blown by the ratio of hydrogen gas (mol%).
  • the reduction reaction of iron-based raw materials with hydrogen gas (that is, hydrogen reduction reaction) is an endothermic reaction. Therefore, when the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas exceeds 300 Nm 3 / t, it is considered that such an endothermic reaction occurs frequently in the furnace and the temperature inside the furnace drops. Then, it is considered that such a decrease in the temperature inside the furnace reduces the reduction efficiency by the reducing gas containing hydrogen gas. In order to prevent such a decrease in reducing efficiency, it is necessary to increase the ratio of reducing materials to carry out the operation. Therefore, when the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas exceeds 300 Nm 3 / t, the reduction rate Input ⁇ C of the carbon consumption intensity starts to decrease.
  • the blowing temperature is room temperature to 300 ° C.
  • the reduction rate Input ⁇ C of the carbon consumption intensity can be set to 8% or more.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is 0 Nm in the base operation. Increasing from 3 / t increases the reduction rate of carbon consumption intensity Input ⁇ C. When the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is 145 Nm 3 / t or more, the reduction rate Input ⁇ C of the carbon consumption intensity is 7% or more.
  • the blowing temperature of the high-concentration hydrogen-containing gas is 600 ° C., as shown in FIG.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is about 600 Nm 3 / t, and the reduction rate of carbon consumption intensity Imput. ⁇ C is saturated.
  • the blowing temperature of the high-concentration hydrogen-containing gas is 350 ° C., as shown in FIG. 4, when the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is about 300 Nm 3 / t, the carbon consumption intensity is the basic unit.
  • the reduction rate of Imput ⁇ C peaks and the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas further increases, the reduction rate of carbon consumption intensity Imput ⁇ C starts to decrease.
  • the tuyere temperature Tf should be maintained at 2200 ° C. when the blowing amount of the hydrogen gas in the high-concentration hydrogen-containing gas exceeds 600 Nm 3 / t. Can be difficult.
  • the tuyere temperature Tf is often set to about 2200 ° C., and when it is difficult to maintain the tuyere temperature Tf at 2200 ° C., the operation is largely different from the operating conditions of the conventional blast furnace operation. The conditions will be changed.
  • the reason why the reduction rate Input ⁇ C of the carbon consumption intensity starts to decrease when the blowing temperature of the high-concentration hydrogen-containing gas is 350 ° C. is the same as the above.
  • the blowing temperature of the high-concentration hydrogen-containing gas is 600 ° C.
  • the reduction rate Input ⁇ C of the carbon consumption intensity does not turn to decrease in the range of the blowing amount up to 700 Nm 3 / t.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is about 600 Nm 3 / t, the effect of reducing the carbon consumption intensity is saturated.
  • the blowing temperature is more than 350 ° C and 600 ° C or less, the sensible heat of Bosch gas is larger.
  • the reduction rate Input ⁇ C of the carbon consumption intensity is saturated. Further, when the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is 300 to 600 Nm 3 / t, the reduction rate of carbon consumption intensity is 10% or more.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is increased from 0 Nm 3 / t in the base operation.
  • the reduction rate of carbon consumption intensity, Input ⁇ C will increase.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is within the range of 125 Nm 3 / t or more, the reduction rate of carbon consumption intensity is 7% or more.
  • the reduction rate of carbon consumption intensity is 10% or more.
  • FIG. 7 shows the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas and the reduction rate of the carbon consumption intensity when the blowing temperature of the high-concentration hydrogen-containing gas (here, pure hydrogen gas) is 900 ° C.
  • the reduction reaction with hydrogen gas is an endothermic reaction
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas increases to some extent, the reduction rate of carbon consumption intensity Input ⁇ C starts to decrease.
  • the blowing temperature of the high-concentration hydrogen-containing gas exceeds 600 ° C.
  • the sensible heat of the Bosch gas generated in the blast furnace becomes very high, so that the reaction heat required for the reduction reaction can be covered. Therefore, even if the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas increases, the reduction rate of carbon consumption intensity Input ⁇ C does not start to decrease, but is considered to continue to increase.
  • Such behavior is observed when the blowing temperature of the high-concentration hydrogen-containing gas exceeds 600 ° C.
  • the upper limit of the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is not particularly set.
  • the rate of decrease in carbon consumption intensity decreases, and the rate of increase in Input ⁇ C decreases.
  • the effect is expected to level off.
  • the amount of blown water at this time is assumed to be approximately 1000 Nm 3 / t. Therefore, the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas may be 1000 Nm 3 / t or less.
  • the blowing temperature is more than 900 ° C and 1200 ° C or less
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is increased from 0 Nm 3 / t in the base operation.
  • the reduction rate of carbon consumption intensity Output ⁇ C
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is within the range of 110 Nm 3 / t or more
  • the reduction rate of carbon consumption intensity is 7% or more.
  • the reduction rate of carbon consumption intensity is 10% or more.
  • FIG. 9 shows the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas and the reduction rate of the carbon consumption intensity when the blowing temperature of the high-concentration hydrogen-containing gas (here, pure hydrogen gas) is 1200 ° C. Although it is a graph showing the correlation with C, the same tendency as in FIG.
  • the upper limit of the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is not particularly set.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas reaches about 1000 Nm 3 / t, the effect of reducing the carbon consumption intensity is expected to peak, so hydrogen in the high-concentration hydrogen-containing gas
  • the amount of gas blown may be 1000 Nm 3 / t or less.
  • the pressure loss is the difference between the pressure at the tuyere tip (in front of the tuyere), in other words, the pressure inside the furnace at the outlet of the tuyere and the pressure at the top of the furnace, excluding the pipe pressure loss from the blower to the tuyere tip. Value.
  • the pressure loss is measured by a pressure gauge installed on the furnace wall.
  • FIG. 14 in the blast furnace operation under the high hydrogen concentration condition as in the present embodiment, the gas viscosity and the gas density in the furnace are significantly lowered, so that the pressure loss when the coke ratio is reduced is increased. Concerns about the rise have been resolved, and the pressure loss is such that there is no problem with stable operations in actual operations.
  • FIG. 14 is a graph showing the correlation between the amount of pure hydrogen gas blown at 1200 ° C. and the amount of change in the pressure loss in the furnace when the temperature in front of the tuyere reaches 2100 ° C., which was obtained by blast furnace operation simulation. It is something that can be done.
  • the pressure loss in normal operation is about 85 kPa as a guide. According to FIG. 14, it can be seen that the pressure loss is less than 85 kPa under the operating conditions of the present embodiment.
  • the carbon consumption source is increased.
  • Unit reduction rate Input ⁇ C increases.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is within the range of 100 Nm 3 / t or more, the reduction rate of carbon consumption intensity is 7% or more.
  • the blowing temperature of the high-concentration hydrogen-containing gas becomes more than 600 ° C and 900 ° C or lower, the reduction rate of the carbon consumption intensity as the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas increases.
  • the upper limit of the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is not particularly set.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas reaches about 1000 Nm 3 / t, the effect of reducing the carbon consumption intensity is expected to peak, so hydrogen in the high-concentration hydrogen-containing gas
  • the amount of gas blown may be 1000 Nm 3 / t or less.
  • the upper limit of the blowing temperature is not particularly limited as long as the blowing temperature of the high-concentration hydrogen-containing gas can exceed 600 ° C.
  • the effect of reducing the carbon consumption intensity is almost flat in the range where the blowing temperature of the high-concentration hydrogen-containing gas is in the range of more than 1200 ° C to about 1400 ° C.
  • FIG. 15 and FIG. 16 show the correlation between the blowing temperature of pure hydrogen gas and the blowing amount of pure hydrogen gas required to set the carbon consumption intensity reduction rate Input ⁇ C to 10% or 20%. It is a graph which shows. The tuyere front temperature Tf was 2100 ° C. These graphs show the correlation between FIGS.
  • the blowing temperature of the high-concentration hydrogen-containing gas may be 1400 ° C. or lower. That is, the blowing temperature of the high-concentration hydrogen-containing gas may be, for example, more than 600 ° C. and 1400 ° C. or lower.
  • the tuyere for blowing the high-concentration hydrogen-containing gas is, for example, a tuyere for blowing hot air provided in the lower part of the furnace.
  • the description will be made on the premise that the high-concentration hydrogen-containing gas is blown from the tuyere for blowing hot air, but the tuyere for blowing the high-concentration hydrogen-containing gas is not limited to this.
  • the tuyere is a so-called shaft tuyere provided on the shaft portion.
  • the high-concentration hydrogen-containing gas may be blown into the blast furnace from any of these tuyere, or may be blown into the blast furnace from both tuyere.
  • the total amount of hydrogen gas blown into the high-concentration hydrogen-containing gas blown from each tuyere matches the above-determined blowing amount.
  • the tuyere front temperature Tf is maintained at 2050 ° C. or lower.
  • the tuyere front temperature Tf is the furnace temperature at the tip of the tuyere inside the furnace, and is also referred to as the tuyere tip temperature Tf.
  • the tuyere temperature Tf is calculated as the tuyere tip theoretical combustion temperature according to the Lamb's formula described in the "Pig Iron Handbook" (Chijin Shokan) by Akitoshi Shigemi.
  • the tuyere temperature Tf is 2050 ° C. or lower (2000 ° C. in FIGS. 2, 3, 5, 7, and 9).
  • the reduction rate of carbon consumption intensity in the case of Input ⁇ C is 2100 ° C. and 2200 ° C. in FIGS. 2, FIG. 3, FIG. 5, FIG. 7, and FIG. 9 when the tuyere temperature Tf exceeds 2050 ° C. )
  • Reduction rate of carbon consumption intensity is larger than Input ⁇ C. Therefore, in the first modification, the tuyere front temperature Tf is maintained at 2050 ° C. or lower. As a result, the reduction rate Input ⁇ C of the carbon consumption intensity can be further increased. As shown in FIGS.
  • the tuyere temperature Tf is lowered by blowing the high-concentration hydrogen-containing gas into the blast furnace.
  • the hot air blown into the blast furnace is a gas containing air.
  • the hot air may further contain moisture and enriched oxygen in addition to air.
  • the tuyere temperature Tf is preferably 2000 ° C. or higher. However, if the reduction rate Input ⁇ C of the carbon consumption intensity is sufficiently large and the pulverized coal ratio (the pulverized coal used per ton of hot metal) can be sufficiently lowered, the tuyere temperature Tf is less than 2000 ° C. There may be. For example, even if the tuyere temperature Tf is less than 2000 ° C., the tuyere temperature Tf may be less than 2000 ° C. as long as the reduction rate Input ⁇ C of the carbon consumption intensity can be maintained and stable operation is possible.
  • the blowing temperature of the high-concentration hydrogen-containing gas is 1200 ° C. and the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is 800 Nm 3 / t or more, pulverized coal.
  • the blowing amount is 0 (that is, the pulverized coal ratio is 0).
  • the reduction rate Input ⁇ C of the carbon consumption intensity can be maintained even if the tuyere temperature Tf is less than 2000 ° C., and stable operation becomes possible. Therefore, the tuyere front temperature Tf can be set to less than 2000 ° C.
  • the tuyere front temperature Tf may be set to less than 2000 ° C.
  • the tuyere front temperature Tf is maintained above 2050 ° C. and below 2150 ° C.
  • the reduction rate Input ⁇ C of the carbon consumption intensity can be increased by setting the tuyere front temperature Tf to 2050 ° C. or lower.
  • the combustion rate of pulverized coal may decrease. That is, when the tuyere temperature Tf decreases, it becomes difficult for the pulverized coal to burn.
  • the pulverized coal is flame-retardant or when the operation is performed with a high pulverized coal ratio, the possibility that the combustion rate of the pulverized coal decreases is further increased.
  • the temperature inside the furnace decreases, so that it may be necessary to carry out an operation in which the ratio of the reducing agent is increased accordingly.
  • the tuyere front temperature Tf is maintained above 2050 ° C and below 2150 ° C. As a result, the combustion rate of the pulverized coal can be maintained, and thus the decrease in the temperature inside the furnace can be suppressed.
  • the tuyere front temperature Tf is maintained above 2150 ° C.
  • the tuyere temperature Tf is often set to about 2200 ° C. Therefore, by setting the tuyere front temperature Tf to more than 2150 ° C., the operation can be performed without significantly changing the operating conditions from the conventional blast furnace operation.
  • the tuyere front temperature Tf is preferably 2250 ° C. or lower.
  • the reduction ratio of carbon consumption intensity to each of several blown amounts is calculated by the blast furnace operation simulation that reflects the current blast furnace operation including the blowing temperature of the high-concentration hydrogen-containing gas.
  • the specific method may be the same as that of the examples described later.
  • the horizontal axis is the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas in the unit Nm 3 / t
  • the vertical axis is the reduction rate of carbon consumption intensity Input ⁇ C (%). Plot the calculated value.
  • the approximate curves of these plots may be obtained by, for example, the least squares method, and the relational expression showing the approximate curves, more specifically, the approximate curves may be used as the above-mentioned injection amount-carbon consumption intensity reduction ratio correlation. ..
  • the correlation between the amount of blown material and the reduction rate of carbon consumption intensity is preferably obtained for each tuyere temperature Tf.
  • the reduction rate of carbon consumption intensity is larger than that of the current operation.
  • Input ⁇ C is larger. That is, the injection amount for which carbon consumption is reduced is calculated above. Determined based on correlation. Then, a high-concentration hydrogen-containing gas is blown from the tuyere at the determined blowing amount. As a result, the reduction rate Input ⁇ C of the carbon consumption intensity can be increased more reliably.
  • FIG. 12 shows the correlation between the amount of pure hydrogen gas blown at room temperature in the unit Nm 3 / t and the amount of change in pressure loss in the unit kPa with respect to the base operation, which is an operation in which high-concentration hydrogen-containing gas is not blown. It is a graph which shows for each pre-temperature Tf. This graph is obtained by blast furnace operation simulation. Details will be described in Examples.
  • the pressure loss is the difference between the pressure at the tuyere tip (in front of the tuyere), in other words, the pressure inside the furnace at the outlet of the tuyere and the pressure at the top of the furnace, excluding the pipe pressure loss from the blower to the tuyere tip. Value.
  • the pressure loss is measured by a pressure gauge installed on the furnace wall.
  • the amount of change in pressure loss with respect to the base operation is the value obtained by subtracting the pressure loss during the base operation from the pressure loss during a certain operation. It is preferable that the pressure loss is about the same as that of the base operation or lower than that of the base operation from the viewpoint of restricting the blowing pressure and preventing blow-by.
  • FIG. 12 shows the above correlation when pure hydrogen gas at room temperature is used, but the above correlation can also be obtained when a high-concentration hydrogen-containing gas other than pure hydrogen gas is used. Further, the above correlation can be obtained even if the blowing temperature of the high-concentration hydrogen-containing gas is higher than room temperature.
  • the oxygen enrichment rate is adjusted while keeping the amount of tapping at a predetermined amount. Therefore, as the oxygen enrichment rate increases, the flow rate of hot air decreases. As a result, the amount of Bosch gas is reduced. In other words, when the tuyere temperature Tf is low, the amount of Bosch gas increases. As a result, the pressure loss may be larger than that of the base operation.
  • the injection amount-carbon consumption intensity reduction ratio correlation is obtained in advance in the same manner as in the modified example 4. Furthermore, the correlation between the amount of blown air and the amount of change in pressure loss, which is the correlation between the amount of blown air and the amount of change in pressure loss with respect to the base operation, is obtained.
  • the amount of change in pressure loss with respect to each of several blowing amounts is obtained by a blast furnace operation simulation that reflects the current blast furnace operation including the blowing temperature of high-concentration hydrogen-containing gas.
  • the specific method may be the same as that of the examples described later.
  • the above method is on a plane in which the horizontal axis is the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas in the unit Nm 3 / t and the vertical axis is the amount of change in the pressure loss in the unit kPa. Plot the value obtained in.
  • the approximate curves of these plots may be obtained by, for example, the least squares method, and this approximate curve (more specifically, the relational expression showing the approximate curve) may be used as the above-mentioned blow amount-pressure loss change amount correlation.
  • the correlation between the amount of blown air and the amount of change in pressure loss is preferably obtained for each tuyere temperature Tf.
  • the reduction rate Input ⁇ C of the carbon consumption intensity is larger than that of the current operation, that is, the amount of injection is injected so that the amount of carbon consumption is reduced and the amount of change in pressure loss is within a predetermined range.
  • the predetermined range is, for example, about ⁇ 50 to +5 kPa, but is not limited to this.
  • a high-concentration hydrogen-containing gas is blown from the tuyere at the determined blowing amount. As a result, it is possible to more reliably increase the reduction rate Input ⁇ C of the carbon consumption intensity while keeping the amount of change in pressure loss within a predetermined range.
  • FIG. 13 is a graph showing the correlation between the amount of pure hydrogen gas blown in the unit Nm 3 / t at room temperature and the amount of change in the furnace top gas temperature with respect to the base operation at the unit ° C. for each tuyere temperature Tf. .. This graph is obtained by blast furnace operation simulation. Details will be described in Examples.
  • the furnace top gas temperature is the temperature of the top gas (mainly CO 2 , N 2 , unreacted CO, etc.) discharged from the top of the blast furnace, and is installed in the riser pipe or the like in actual operation. Measured by a thermometer.
  • the amount of change in the top gas temperature with respect to the base operation is a value obtained by subtracting the top gas temperature during the base operation from the top gas temperature during a certain operation.
  • the furnace top gas temperature is preferably about the same as the base operation from the viewpoint of restrictions on the furnace top equipment and operational efficiency, and as an example, the furnace top gas temperature of the base operation is preferably within the range of about ⁇ 20 ° C. ..
  • FIG. 13 shows the above correlation when a pure hydrogen gas at room temperature is used, but the above correlation can also be obtained when a high-concentration hydrogen-containing gas other than the pure hydrogen gas is used. Further, the above correlation can be obtained even if the blowing temperature of the high-concentration hydrogen-containing gas is higher than room temperature.
  • the amount of Bosch gas is reduced.
  • the heat flow ratio expressed by (heat capacity of the furnace interior container falling per unit time) / (heat capacity of Bosch gas rising per unit time) increases.
  • the temperature of the gas in the furnace that rises in the furnace tends to decrease, and as a result, the temperature of the gas at the top of the furnace tends to decrease.
  • the temperature of the furnace top gas may be lower than that of the base operation.
  • the operation is performed by increasing the reducing agent ratio.
  • the reducing agent ratio is increased, the amount of heat input into the furnace increases and the furnace top gas temperature tends to rise. The furnace top gas temperature starts to increase.
  • the injection amount-carbon consumption intensity reduction ratio correlation is obtained in advance in the same manner as in the modified example 4. Furthermore, the correlation between the blown amount and the change in the top gas temperature with respect to the base operation, which is the correlation between the blown amount and the change in the top gas temperature, is obtained.
  • the amount of change in the furnace top gas temperature for each of several injection amounts is obtained by a blast furnace operation simulation that reflects the current blast furnace operation including the injection temperature of high-concentration hydrogen-containing gas.
  • the specific method may be the same as that of the examples described later.
  • the horizontal axis is the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas in the unit Nm 3 / t
  • the vertical axis is the amount of change in the furnace top gas temperature in the unit ° C.
  • the values obtained by the above method are plotted above.
  • the approximate curves of these plots may be obtained by, for example, the least squares method, and the relational expression showing the approximate curves, more specifically, the approximate curves may be used as the above-mentioned injection amount-furnace top gas temperature change amount correlation. ..
  • the correlation between the amount of blown gas and the amount of change in the temperature of the top gas is preferably obtained for each tuyere front temperature Tf.
  • the reduction rate Input ⁇ C of the carbon consumption intensity is larger than that of the current operation, that is, the amount of injection is such that the carbon consumption is reduced and the amount of change in the furnace top gas temperature is within the predetermined range.
  • the predetermined range is, for example, about ⁇ 20 to + 20 ° C., but is not limited thereto.
  • the parameter paired with the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is not necessarily limited to the reduction rate Input ⁇ C of the carbon consumption intensity. That is, the parameter paired with the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas may be any parameter related to carbon consumption, that is, any carbon consumption parameter. This is because if carbon consumption is reduced, CO 2 emissions can be reduced. Examples of such a carbon consumption parameter include a reduction rate of carbon consumption intensity, Input ⁇ C, a carbon consumption intensity, a reducing agent ratio, a reduction rate of the reducing agent ratio, and the like.
  • the reduction ratio of the reducing agent ratio is the reduction ratio of the reducing agent ratio with respect to the base operation, and the method of obtaining it is the same as the method of obtaining the reduction ratio Input ⁇ C of the carbon consumption intensity.
  • the modification 5 and the modification 6 may be combined. As a result, while keeping the amount of change in pressure loss and the amount of change in furnace top gas temperature within a predetermined range, the reduction rate Input ⁇ C of the carbon consumption intensity can be increased more reliably.
  • Example 1 Verification when the blowing temperature of the high-concentration hydrogen-containing gas is room temperature to 600 ° C> As described above, the correlation between the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas and the reduction rate of carbon consumption intensity Input ⁇ C shows different behavior with the blowing temperature of 600 ° C. as a boundary. Therefore, in Example 1, verification was performed when the blowing temperature of the high-concentration hydrogen-containing gas was 600 ° C. or lower.
  • blast furnace mathematical model For blast furnace operation simulation, Koji TAKATANI, Takanobu INADA, Yutaka UJISAWA, "Three-dimensional Dynamic Simulation for Blast Furnace", ISIJ International, Vol. 39 (1999), No. 1, p.
  • the so-called "blast furnace mathematical model” shown in 15-22 and the like was used. This blast furnace mathematical model roughly defines a plurality of meshes (small regions) by dividing the internal region of the blast furnace into the height direction, the radial direction, and the circumferential direction, and simulates the behavior of each mesh. is there.
  • the amount of high-concentration hydrogen-containing gas blown is set as the amount of high-concentration hydrogen-containing gas blown from the tuyere.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is set as the amount obtained by multiplying the amount of high-concentration hydrogen-containing gas blown by the ratio of hydrogen gas in the unit mol%.
  • the blowing temperature of the high-concentration hydrogen-containing gas is set as the temperature of the high-concentration hydrogen-containing gas when the high-concentration hydrogen-containing gas is blown from the tuyere.
  • the tuyere temperature Tf is calculated as a result of considering the combustion heat of various gases, the sensible heat of the blast, the temperature of coke flowing into the tuyere tip (in front of the tuyere), various reaction heats, and the like.
  • the pressure loss is calculated by using the ergun equation as the pressure loss of the filling layer in the furnace.
  • the furnace top gas temperature is calculated as the gas temperature in the outermost layer (uppermost layer) of the furnace interior container.
  • the calculation conditions are shown in Table 1.
  • the coke ratio in Table 1 is the amount of coke used per ton of hot metal.
  • Table 2 shows the specifications of the base operation in which a high-concentration hydrogen-containing gas is not blown.
  • the tuyere temperature Tf was set to any of 2000 ° C., 2100 ° C., and 2200 ° C.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas was set to 0 to 600 Nm 3 / t.
  • the amount of air blown, the oxygen enrichment rate, and the amount of PC (pulverized coal) blown were adjusted so that the hot metal output ratio and the hot metal temperature were constant in all operations.
  • Example 1-1 A case where the blowing temperature of the high-concentration hydrogen-containing gas is room temperature to 600 ° C. and the high-concentration hydrogen-containing gas is pure hydrogen gas>
  • the high-concentration hydrogen-containing gas is regarded as pure hydrogen gas, and the amount of pure hydrogen gas blown and the reduction ratio of the carbon consumption intensity are reduced.
  • the correlation with Input ⁇ C was calculated. The results are shown in FIGS. 2 to 5.
  • the reduction rate of carbon consumption intensity Input ⁇ C does not simply increase as the blowing amount increases. It was found that when the amount of blown air increased to some extent, it became saturated and started to decrease. Then, it was found that the amount of blown air when the reduction rate of carbon consumption intensity, Input ⁇ C, was saturated and started to decrease was slightly different depending on the blown temperature. That is, it was found that there is an appropriate range of the blowing amount for each blowing temperature.
  • the appropriate range is 200 to 500 Nm 3 / t when the blowing temperature is room temperature to 300 ° C, and 145 Nm 3 / t or more when the blowing temperature is more than 300 ° C and 600 ° C or less. It became. Further, as shown in FIGS. 4 and 5, the reduction rate Input ⁇ C of the carbon consumption intensity does not simply increase with the increase in the blowing amount, and when the blowing temperature is 600 ° C., the blowing is performed. It was found that the amount was saturated at about 600 Nm 3 / t, and when the blowing temperature was 350 ° C., the blowing amount peaked at about 300 Nm 3 / t and started to decrease as the blowing amount increased.
  • the reduction rate of carbon consumption intensity is 7% or more when the blowing amount is within the appropriate range of 145 Nm 3 / t or more. It became possible to. Further, as shown in FIGS. 2 to 5, the reduction ratio Input ⁇ C of the carbon consumption intensity with respect to the same blowing amount differs depending on the tuyere temperature Tf, and when the tuyere temperature Tf becomes 2000 ° C. It was also found to be the largest. The reason why such a phenomenon is obtained is as described above.
  • the reduction rate of carbon consumption intensity Input ⁇ C can be increased, and CO 2 emissions can be significantly reduced. can do.
  • Example 1-2 In Example 1-2, it was confirmed that even if the high-concentration hydrogen-containing gas contained a gas other than hydrogen gas, the same operation as in the case of pure hydrogen gas was possible. Specifically, assuming a 80mol% H 2 -20mol% N 2 gas composed of 80 mol% of hydrogen gas and 20 mol% of nitrogen gas as a high-concentration hydrogen-containing gas. Then, the blast furnace operation simulation was performed in the same manner as in Example 1 with the blowing temperature being 25 ° C. and the tuyere front temperature Tf being 2100 ° C. The results are shown in FIG.
  • Figure 11 shows by comparing the calculation result of the calculation results of pure hydrogen gas (100 mol% H 2 gas) and 80mol% H 2 -20mol% N 2 gas.
  • the horizontal axis of FIG. 11, the flow rate of the mixed gas is obtained by converting the pure hydrogen gas, i.e., a value obtained by multiplying the 80 mol% to the flow rate of 80mol% H 2 -20mol% N 2 gas.
  • the proper scope of the blowing amount in terms of pure hydrogen gas is maintained at the case of pure hydrogen gas, it is slightly lowered only effect allowance I understood it.
  • Example 1-3> In Example 1-3, pure hydrogen gas at room temperature was used as the high-concentration hydrogen-containing gas, and the amount of change in pressure loss with respect to each of several blowing amounts (the amount of change in pressure loss with respect to the base operation) was determined. .. The result is shown in FIG. As is clear from FIG. 12, it was found that there is a certain correlation between the amount of pure hydrogen gas blown and the amount of change in pressure loss. For example, it was found that when the tuyere temperature Tf is low, the pressure loss may be large with respect to the base operation. However, the pressure loss decreased as the amount of pure hydrogen gas blown increased. More specifically, when the tuyere temperature Tf was 2000 ° C.
  • the blowing amount-pressure loss change amount correlation which is the correlation between the blowing amount of hydrogen gas in the high concentration hydrogen-containing gas and the change amount of the pressure loss with respect to the base operation, is obtained.
  • Blow of hydrogen gas in high-concentration hydrogen-containing gas which is obtained in advance for each tuyere temperature Tf, carbon consumption is reduced compared to the current operation, and the amount of change in pressure loss is within a predetermined range.
  • the reduction rate of carbon consumption intensity Imput ⁇ C is set while keeping the amount of change in pressure loss within a predetermined range. It turns out that it can be made larger.
  • the blowing amount was 250 to 300 Nm 3 / t
  • the amount of change in the furnace top gas temperature was a value outside the above-mentioned predetermined range.
  • the blowing amount may be adjusted in consideration of the correlation between the blowing amount of pure hydrogen gas and the change amount of the furnace top gas temperature.
  • the blowing amount-the top gas temperature which is the correlation between the blowing amount of hydrogen gas in the high-concentration hydrogen-containing gas and the change in the furnace top gas temperature with respect to the base operation.
  • the change amount correlation is obtained in advance for each tuyere temperature, and in high-concentration hydrogen-containing gas where the carbon consumption is reduced compared to the current operation and the change amount of the furnace top gas temperature is within a predetermined range. It was found that the decrease in operational efficiency can be suppressed by determining the amount of hydrogen gas blown in based on the amount of blown hydrogen-carbon consumption parameter correlation and the amount of blown hydrogen-relationship of the temperature change of the furnace top gas. It was.
  • Example 2 Verification when the blowing temperature of the high-concentration hydrogen-containing gas exceeds 600 ° C> In Example 2, the case where the blowing temperature of the high-concentration hydrogen-containing gas exceeds 600 ° C. was verified.
  • Example 2 The same blast furnace mathematical model as in Example 1 was used for the blast furnace operation simulation.
  • the calculation conditions are shown in Table 3.
  • Table 3 the calculation conditions were almost the same as those in Example 1, but the coke ratio was different from that in Example 1. That is, in Example 2, the coke ratio is constant at 300 kg / t when the pulverized coal injection amount is larger than 0 ton / h, and the pulverized coal injection amount is 0 ton / h (that is, the pulverized coal ratio is 0 ton / h). When it becomes 0), it is decided to change. That is, when the amount of pulverized coal blown was 0 ton / h, the furnace temperature was adjusted by the coke ratio.
  • the pulverized coal blowing amount can be 0 ton / h. In this case, by reducing the coke ratio, it is possible to further reduce the carbon consumption intensity.
  • the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas was set to 0 to 1000 Nm 3 / t. Further, the blowing temperature of the high-concentration hydrogen-containing gas was set to more than 600 ° C and 1400 ° C or less.
  • the specifications of the base operation in which the high-concentration hydrogen-containing gas was not blown were the same as in Example 1. Other conditions were the same as in Example 1.
  • the amount of air blown, the oxygen enrichment rate, and the amount of PC (pulverized coal) blown were adjusted so that the hot metal output ratio and the hot metal temperature were constant in all operations.
  • the iron-based raw material was the sinter used in Example 1.
  • Example 2-1 Case where the blowing temperature of the high-concentration hydrogen-containing gas is over 600 ° C. and the high-concentration hydrogen-containing gas is pure hydrogen gas>
  • Example 2-1 using a high-concentration hydrogen-containing gas as pure hydrogen gas the correlation between the amount of pure hydrogen gas blown and the reduction rate Input ⁇ C of the carbon consumption intensity was calculated. The results are shown in FIGS. 6 to 10.
  • the range in which the reduction rate Input ⁇ C of the carbon consumption intensity was 7% or more was different depending on the blowing temperature of the high-concentration hydrogen-containing gas. Specifically, when the blowing temperature is more than 600 ° C. and 900 ° C. or lower, the amount of hydrogen gas blown into the high-concentration hydrogen-containing gas is within the range of 125 Nm 3 / t or more. The reduction rate of carbon consumption intensity Input ⁇ C was 7% or more. Further, when the blowing temperature is more than 900 ° C. and 1200 ° C. or lower, the carbon consumption source is when the blowing amount of hydrogen gas in the high-concentration hydrogen-containing gas is within the range of 110 Nm 3 / t or more.
  • the unit reduction rate, Input ⁇ C was 7% or more.
  • the blowing temperature exceeds 1200 ° C, when the blowing amount of hydrogen gas in the high-concentration hydrogen-containing gas is within the range of 100 Nm 3 / t or more, the reduction rate of carbon consumption intensity Input ⁇ C was 7% or more.
  • the amount of change in the furnace top gas temperature is set to a value within a predetermined range, and the reduction rate of carbon consumption intensity is Imput ⁇ . C can be increased.

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Abstract

Selon un aspect de la présente invention, l'invention concerne un procédé de fonctionnement de haut fourneau caractérisé en ce qu'un gaz contenant de l'hydrogène à haute concentration qui contient au moins 80 % en moles de gaz d'hydrogène, est soufflé depuis une tuyère dans certaines conditions telles que : une condition dans laquelle la température de soufflage du gaz contenant de l'hydrogène à haute concentration est de la température ambiante à 300 °C, et la quantité soufflée de gaz d'hydrogène dans le gaz contenant de l'hydrogène à haute concentration est de 200 Nm3/t à 500 Nm3/t ; une condition dans laquelle la température de soufflage du gaz contenant de l'hydrogène à haute concentration est de 300 °C à 600 °C, et la quantité soufflée de gaz hydrogène dans le gaz contenant de l'hydrogène à haute concentration est d'au moins 145 Nm3/t ; ou une condition dans laquelle la température de soufflage du gaz contenant de l'hydrogène à haute concentration est de 600 °C à 900 °C, et la quantité soufflée du gaz contenant de l'hydrogène à haute concentration est d'au moins 125 Nm3/t
PCT/JP2020/044217 2019-11-29 2020-11-27 Procédé de fonctionnement de haut fourneau WO2021107091A1 (fr)

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CN202080083068.4A CN114787391B (zh) 2019-11-29 2020-11-27 高炉的操作方法
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US17/779,384 US20220403477A1 (en) 2019-11-29 2020-11-27 Blast furnace operation method
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WO2023032650A1 (fr) * 2021-08-31 2023-03-09 株式会社クリーンプラネット Appareil de chauffage d'hydrogène pour hauts-fourneaux, procédé de chauffage d'hydrogène pour hauts-fourneaux et procédé de fonctionnement de haut-fourneau
KR20230046067A (ko) * 2021-09-29 2023-04-05 현대제철 주식회사 고로 조업 제어방법

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KR20240006044A (ko) * 2021-06-28 2024-01-12 제이에프이 스틸 가부시키가이샤 공급 열량 추정 방법, 공급 열량 추정 장치, 공급 열량 추정 프로그램, 및 고로의 조업 방법

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