WO2020166347A1 - ベルレス高炉の原料装入方法および高炉操業方法 - Google Patents

ベルレス高炉の原料装入方法および高炉操業方法 Download PDF

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Publication number
WO2020166347A1
WO2020166347A1 PCT/JP2020/003337 JP2020003337W WO2020166347A1 WO 2020166347 A1 WO2020166347 A1 WO 2020166347A1 JP 2020003337 W JP2020003337 W JP 2020003337W WO 2020166347 A1 WO2020166347 A1 WO 2020166347A1
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WO
WIPO (PCT)
Prior art keywords
raw material
distribution chute
furnace
blast furnace
charging
Prior art date
Application number
PCT/JP2020/003337
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English (en)
French (fr)
Japanese (ja)
Inventor
泰志 小笠原
佐藤　健
和平 市川
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN202080013727.7A priority Critical patent/CN113423844A/zh
Priority to JP2020519148A priority patent/JP6943339B2/ja
Priority to BR112021015745-0A priority patent/BR112021015745B1/pt
Priority to EP20755670.5A priority patent/EP3896177B1/en
Priority to KR1020217025429A priority patent/KR102635629B1/ko
Publication of WO2020166347A1 publication Critical patent/WO2020166347A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/20—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/10—Charging directly from hoppers or shoots

Definitions

  • the present invention relates to a raw material charging method for a bellless blast furnace and a blast furnace operating method using the raw material charging method for the purpose of reducing the reducing material ratio of the blast furnace.
  • coke and iron source raw material are generally charged alternately from the upper part of the blast furnace as a charge.
  • Coke is used as a reducing material and fuel.
  • the iron source raw material is an oxide containing iron such as sinter, pellets, and lump ores. In the following description, these iron source raw materials will be collectively referred to as "ores".
  • ores iron source raw materials
  • coke layers and ore layers are alternately formed, and a raw material deposit layer is formed. Hot air is blown from the tuyere at the bottom of the blast furnace, and at the same time, auxiliary fuel such as pulverized coal and tar is blown.
  • the air permeability of the raw material deposit layer is largely influenced by the properties, grain size and charging amount of coke and ore. Further, the method of charging the charge from the top of the furnace, that is, the distribution of the charge to be charged into the furnace is greatly influenced. In the following description, this distribution state of the charge is referred to as “charge distribution”.
  • the control of the mass ratio distribution of the coke layer and the ore layer in the radial direction of the blast furnace has been most often used conventionally.
  • the mass ratio of the coke layer and the ore layer is described as “[Ore/Coke]”.
  • the blast furnace is classified into a bellless blast furnace or a bell blast furnace depending on the type of raw material charging device. In either case of the bellless blast furnace or the bell blast furnace, in order to obtain a particularly stable gas flow, it is effective to reduce the value of [Ore/Coke] in the central part of the furnace.
  • the operating condition is that the amount of ore is large relative to the amount of coke charged.
  • high O/C conditions In the blast furnace operation under the "high O/C condition", the ratio of the ore layer having a large air flow resistance in the raw material deposition layer becomes high, so that the pressure loss in the upper part of the furnace increases. As a result, blow-by is likely to occur, and hangings or slips are likely to occur without stable dropping of the charged material. Due to such a phenomenon, stable operation of the blast furnace is greatly hindered, and productivity is significantly reduced. Therefore, in order to realize stable operation under high O/C conditions, it is necessary to control (Ore/Coke) more precisely.
  • a bellless charging device equipped with a distribution chute is widely used as a means for charging raw materials from the furnace top.
  • This bellless charging device can adjust the dropping position and the amount of deposition of the raw material in the furnace radial direction by changing the tilt angle and the number of turns of the distribution chute, and thus the [Ore/Coke] can be controlled.
  • the tilt angle of the distribution chute is the angle formed by the vertical direction and the angle at which the raw material flows on the chute surface of the distribution chute.
  • Patent Document 2 discloses a method of reducing the deposition width of the deposit by setting the linear velocity V at the tip of the distribution chute to a predetermined value or less determined by the properties of the raw material to be charged.
  • the reduction of the tip speed of the distribution chute disclosed in Patent Document 2 leads to extension of charging time, which may impede productivity.
  • the present invention solves the above problems and, without impairing productivity, a raw material charging method of a bellless blast furnace capable of charging a raw material at a predetermined position in the furnace, and a blast furnace operating method using the raw material charging method. The purpose is to provide.
  • a method of charging a raw material for a bellless blast furnace wherein an iron source material and a carbonaceous material are charged into a furnace of a blast furnace by swirling the distribution chute, wherein the distribution chute is provided at the tip of the distribution chute.
  • a method for charging a raw material for a bellless blast furnace comprising a repulsion plate inclined downward from the conveying direction, and the swirling speed of the distribution chute is higher than 10.0 rpm.
  • the ore and the carbonaceous material are charged into the blast furnace while the swirling speed of the distribution chute is higher than 10.0 rpm.
  • the deposition angle of the carbonaceous material in the peripheral portion of the furnace wall can be increased and the deposition width can be reduced without impairing the productivity.
  • the area of the region where the [Ore/Coke] is reduced can be reduced in the furnace wall portion, so that the gas utilization rate of the blast furnace is improved and the low reducing agent ratio and low coke ratio operation is realized.
  • FIG. 1 is a schematic diagram showing an outline of the model equipment 10.
  • FIG. 2 is a perspective view and a cross-sectional view showing the tip of the distribution chute 18 including the repulsion plate 22.
  • FIG. 3 is a graph showing the weight distribution obtained by the charging experiment.
  • FIG. 4 is a schematic cross-sectional view of the model equipment 30 used in the coke deposition angle measurement experiment.
  • FIG. 5 is a schematic view showing a situation in the furnace when charging of raw materials is started.
  • FIG. 1 is a schematic diagram showing an outline of the model equipment 10.
  • the model equipment 10 has a furnace top bunker 12, a collecting hopper 16, a distribution chute 18, and a sampling box 24.
  • the furnace top bunker 12 has three hoppers 14 for storing coke and ore. At the bottom of each hopper 14, a gate that allows discharge of the stored raw material is provided.
  • the collecting hopper 16 supplies the raw material discharged from the furnace top bunker 12 to the distribution chute 18.
  • the distribution chute 18 has a chute 20 and a repulsion plate 22.
  • the sampling boxes 24 are provided radially in four directions centered on a position corresponding to the center of rotation of the distribution chute 18. Each sampling box 24 has a plurality of accommodating portions 26 divided at intervals of 20 mm from the center side toward the outside.
  • the height at which the sampling box 24 was installed was set so that the upper opening of the sampling box 24 was at a level of 424 mm vertically downward from the center position of the tilting/turning of the distribution chute 18. This level difference corresponds to 0.67 times the furnace diameter because the furnace diameter of the model equipment 10 is 630 mm.
  • FIG. 2 is a perspective view and a cross-sectional view showing the tip of the distribution chute 18 including the repulsion plate 22.
  • FIG. 2A is a perspective view and FIG. 2B is a sectional view.
  • the repulsion plate 22 is provided at the tip of the distribution chute 18 so as to be inclined downward from the conveying direction.
  • the repulsion plate 22 is provided such that the horizontal distance (L in FIG. 2B) from the tip of the chute 20 to the repulsion plate 22 is 70 mm when the conveyance direction of the chute 20 is parallel to the horizontal direction. ing.
  • the inclination angle of the repulsion plate 22 ( ⁇ in FIG. 2B) is 23° with respect to the horizontal direction.
  • the coke charging experiment using the model equipment 10 was performed according to the following procedure. First, 3 kg of coke having a particle size of 2.0 mm to 2.8 mm was charged into the furnace top bunker 12. The gate opening of the furnace top bunker 12 was adjusted so that 3 kg of coke could be cut out in 17 seconds. Next, the gate was opened, the coke was cut out from the furnace top bunker 12 into the collecting hopper 16, and the coke was dropped through the distribution chute 18. The coke dropped from the distribution chute 18 was stored in the storage portion 26 of the sampling box 24. Coke is an example of carbonaceous material.
  • FIG. 3 is a graph showing the weight distribution obtained by the charging experiment.
  • the horizontal axis of FIG. 3 is the position (mm) in the radial direction from the center, and the vertical axis is the cumulative weight frequency (%).
  • the cumulative weight frequency is defined as the ratio of the weight of coke reaching the center side from the position at a position separated from the center by a predetermined distance, with respect to the total weight of coke.
  • the position where the cumulative weight frequency was 50% was defined as the mainstream drop position, and the radial interval where the cumulative weight frequency was 5% to 95% was defined as the fall width.
  • the tilt angle of the distribution chute 18 was adjusted so that the furnace wall position vertically below 424 mm from the center of tilt/swirl coincides with the cumulative weight frequency of 95%, that is, 315 mm from the center of the furnace.
  • the length of the chute 20 of the distribution chute 18 was set to 240 mm and the turning speed of the distribution chute 18 was changed to 42.2, 50.6 and 59.1 rpm to carry out the charging experiment.
  • the turning speed 42 in the model equipment 10 is .2 rpm corresponds to the swirling speed of the actual blast furnace of 10.0 rpm.
  • the turning speed of 50.6 rpm in the model facility 10 corresponds to the turning speed of the actual blast furnace of 12.0 rpm.
  • the turning speed of 59.1 rpm in the model equipment 10 corresponds to the turning speed of 14.0 rpm of the actual blast furnace.
  • This charging experiment was performed with and without the repulsion plate 22. The experimental conditions and results are shown in Table 1 below.
  • FIG. 4 is a schematic cross-sectional view of the model equipment 30 used in the coke deposition angle measurement experiment.
  • the model equipment 30 includes a furnace top bunker 12, a collecting hopper 16, a distribution chute 18, and a model furnace 32 having a furnace diameter of 630 mm.
  • the furnace top bunker 12, the collecting hopper 16, and the distribution chute 18 are the same as those used in the model facility 10.
  • a deposition surface having an inclination angle of 16° was prepared in the model furnace 32.
  • the coke was dropped on the deposition surface via the distribution chute 18, and the deposition angle of the coke deposited near the furnace wall was measured.
  • the tilt angle of the distribution chute 18 was adjusted within a range in which the mainstream dropping position 424 mm vertically below the center of tilt/swirl was 285 to 325 mm from the center of the furnace.
  • the mainstream drop position was measured by performing a coke charging experiment using the model equipment 10. The results are shown in Tables 2 and 3 below.
  • the coke deposition angle becomes larger even when the mainstream drop position is on the furnace center side. This is because by increasing the swirling speed, the velocity of the coke particles in the horizontal direction also increases, and even if the mainstream drop position is on the furnace center side, the coke particles that collide with the deposition surface move to the furnace wall side, It is considered that this increased the coke deposition angle. Comparing the maximum values of the deposition angle of coke under the same swirling speed with each other, the maximum values of the deposition angle increased as the swirling speed increased.
  • the distribution chute 18 having the repulsion plate 22 attached to the tip was used, the coke accumulation angle could be increased by increasing the turning speed of the distribution chute 18. From this result, it is possible to increase the deposition angle of coke in the vicinity of the furnace wall by using the distribution chute 18 having the repulsion plate 22 mounted at the tip thereof and making the swirling speed of the distribution chute 18 faster than 42.2 rpm to charge the coke. was confirmed.
  • Extending the chute length of the distribution chute from 240 mm to 260 mm resulted in a smaller coke drop width and a smaller coke accumulation angle than when using a distribution chute with a chute length of 240 mm. Even when a distribution chute with a chute length of 260 mm is used, by setting the swirling speed of the distribution chute to 50.6 rpm or more, the coke drop width becomes smaller than when the swirling speed is 42.2 rpm, and the furnace wall The coke deposition angle in the vicinity increased.
  • the method for charging the raw material of the bellless blast furnace according to the present invention was made based on the results of the coke charging experiment.
  • the swirling speeds 42.2 rpm, 50.6 rpm, 59.1 rpm of the distribution chute 18 in the model equipment 10 and the model equipment 30 correspond to the swirling speeds 10.0 rpm, 12.0 rpm, 14.0 rpm of the distribution chute in the actual blast furnace. Therefore, in the raw material charging method for the bellless blast furnace according to the present embodiment, the distribution chute having the repulsion plate inclined downward from the conveying direction of the distribution chute at the tip is used, and the swirling speed of the distribution chute is set higher than 10.0 rpm. Ore and carbonaceous material are charged into the blast furnace.
  • the deposition angle of the carbonaceous material charged in the furnace wall of the blast furnace can be increased and the fall width can be reduced without impeding productivity.
  • the area of the area where [Ore/Coke] is reduced in the furnace wall of the blast furnace can be reduced, which improves the gas utilization rate of the blast furnace and realizes a low reducing agent ratio and low coke ratio operation in the blast furnace. it can.
  • the swirling speed of the distribution chute is preferably 12.0 rpm or more.
  • the coke deposition angle on the furnace wall can be made larger than that when the swirling speed is set to less than 12.0 rpm, and the reducing material ratio and the coke ratio in the blast furnace operation can be further reduced, as shown in Examples described later.
  • the turning speed of the distribution chute is 14.0 rpm or more.
  • the coke deposition angle on the furnace wall can be made larger than when the swirling speed is set to less than 14.0 rpm, and the reducing material ratio and the coke ratio in the blast furnace operation can be further reduced.
  • the distance from the center position of tilting/swirl of the distribution chute to the raw material deposition level in the furnace at the start of raw material charging is 0.60 times or more the radius of the furnace opening.
  • the raw material deposition level in the furnace at the start of raw material charging is the level of the raw material deposition surface in the furnace at the time of starting the raw material charging from the distribution chute.
  • FIG. 5 is a schematic diagram showing the state inside the furnace when the charging of raw materials is started. The deposition surface level of the raw material in the furnace at the start of raw material charging will be described with reference to FIG.
  • the deposition surface of the raw material is not horizontal, but in blast furnace operation, in order to determine the timing of starting the charging of raw material, for example, sounding means such as sounding that detects the deposition surface level of the raw material near the furnace wall is used. ing.
  • the detection means detects that the deposition surface level has dropped to a certain level, and starts charging a predetermined amount of raw material at the detected timing. Thereby, the deposition surface level in the furnace is controlled so as to fall within a predetermined range. Therefore, in the present embodiment, the deposition surface level of the raw material in the furnace at the start of charging the raw material is defined as the horizontal surface 40 at the deposition surface level of the raw material near the furnace wall detected by the detection means.
  • a blast furnace having an inner volume of 5,005 m 3 and a furnace diameter of 11.2 m was used. Ore was cut out from the storage tank and stored in the top hopper, and coke was cut out from the storage tank and stored in another top hopper. Then, the ore and the coke were alternately cut out to a distribution chute having a repulsion plate, and the ore and the coke were deposited in the blast furnace to carry out the blast furnace operation.
  • the chute length of the distribution chute having the repulsion plate was 4.2 m
  • the material deposition level in the furnace at the start of material charging was 7.55 m vertically below the swirling and tilting center of the distribution chute.
  • the ore and coke were deposited on.
  • the center position of tilting and swirling of the distribution chute, the distance d to the deposition surface level of the raw material in the furnace at the start of charging the raw material, the furnace opening radius Ro, and the angle ⁇ determined by the above (1) are 36.6. It becomes °.
  • the chute length of the distribution chute having the repulsion plate was set to 4.2 m, and the raw material deposition level in the furnace at the start of charging the raw material was 7.55 m vertically below the center position of the tilt/swirl of the distribution chute.
  • the ore and coke were deposited in the blast furnace and the blast furnace operation was carried out.
  • the tilt angle of the distribution chute at the start of charging is gradually decreased in accordance with the increase in the turning speed, and after the charging is started, the tilt angle is gradually decreased until the coke is accumulated in the center of the furnace. Charged.
  • the swirling speed of the distribution chute was set to 10.5 to 14.0 rpm. Tables 5 and 6 below show the operating conditions and the operating results of the invention example and the comparative example.
  • the coke deposition angle on the furnace wall was obtained from the profile data of the charge after charging the coke, and was calculated from the inclination angle from the furnace wall to 1.8 m in this profile data.
  • Comparative Example 1 the coke drop width at the raw material deposition level in the furnace at the start of raw material charging was large, and the coke deposition angle on the furnace wall was as small as 26.1°, whereas in Invention Examples 1 to 15, The coke deposition angle on the furnace wall became 26.5° or more. As a result, the area of the region where [Ore/Coke] is reduced in the furnace wall portion is reduced, the gas utilization rate in the entire furnace is improved, and the reducing agent ratio and the coke ratio of Inventive Examples 1 to 15 are compared. It was lower than that of Example 1.
  • the tilt angle of the distribution chute is set to 1.41 ⁇ or more rather than the tilt angle of the distribution chute is less than 1.41 ⁇ .
  • the coke deposition angle on the furnace wall increased, and the reducing agent ratio and coke ratio decreased. From this result, it was confirmed that the reducing agent ratio and the coke ratio in the blast furnace operation can be further reduced by setting the turning angle of the distribution chute to 1.41 ⁇ or more.
  • Model Equipment 12 Top Bunker 14 Hopper 16 Collecting Hopper 18 Distribution Chute 20 Chute 21 Arrow 22 Repulsion Plate 24 Sampling Box 26 Housing 30 Model Equipment 32 Model Furnace 40 Horizontal Plane 42 Center Position

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Manufacture Of Iron (AREA)
PCT/JP2020/003337 2019-02-15 2020-01-30 ベルレス高炉の原料装入方法および高炉操業方法 WO2020166347A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202080013727.7A CN113423844A (zh) 2019-02-15 2020-01-30 无料钟高炉的原料装入方法及高炉操作方法
JP2020519148A JP6943339B2 (ja) 2019-02-15 2020-01-30 ベルレス高炉の原料装入方法および高炉操業方法
BR112021015745-0A BR112021015745B1 (pt) 2019-02-15 2020-01-30 Método para carregar matérias-primas em um alto-forno sem cone e método de operação de alto-forno
EP20755670.5A EP3896177B1 (en) 2019-02-15 2020-01-30 Method for charging raw material into bell-less blast furnace, and blast furnace operation method
KR1020217025429A KR102635629B1 (ko) 2019-02-15 2020-01-30 벨리스 고로의 원료 장입 방법 및 고로 조업 방법

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JP2019025211 2019-02-15
JP2019-025211 2019-02-15

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WO2020166347A1 true WO2020166347A1 (ja) 2020-08-20

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EP (1) EP3896177B1 (zh)
JP (1) JP6943339B2 (zh)
KR (1) KR102635629B1 (zh)
CN (1) CN113423844A (zh)
WO (1) WO2020166347A1 (zh)

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Publication number Priority date Publication date Assignee Title
CN112176136A (zh) * 2020-09-24 2021-01-05 中南大学 一种高炉u型溜槽上炉料运动轨迹建模方法及***

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JP2011140705A (ja) * 2010-01-08 2011-07-21 Nippon Steel Corp 高炉用ベルレス式炉頂装入装置の旋回シュート及び高炉操業方法
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112176136A (zh) * 2020-09-24 2021-01-05 中南大学 一种高炉u型溜槽上炉料运动轨迹建模方法及***
CN112176136B (zh) * 2020-09-24 2021-09-14 中南大学 一种高炉u型溜槽上炉料运动轨迹建模方法及***

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KR102635629B1 (ko) 2024-02-08
JPWO2020166347A1 (ja) 2021-03-11
EP3896177B1 (en) 2023-06-07
CN113423844A (zh) 2021-09-21
EP3896177A1 (en) 2021-10-20
JP6943339B2 (ja) 2021-09-29
KR20210113339A (ko) 2021-09-15
BR112021015745A2 (pt) 2021-10-26
EP3896177A4 (en) 2021-11-03

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