WO2004027097A1

WO2004027097A1 - Raw material charging method for bell-less blast furnace

Info

Publication number: WO2004027097A1
Application number: PCT/JP2003/010907
Authority: WO
Inventors: Hirofumi Nishimura; Shigeaki Goto; Nozomu Nishimura; Hideyuki Kamano; Shinji Hasegawa; Shin'ichiro Yamana; Masanori Takeshita; Shiro Watakabe; Takeshi Ito; Hideo Fujimoto
Original assignee: Jfe Steel Corporation
Priority date: 2002-08-29
Filing date: 2003-08-28
Publication date: 2004-04-01
Also published as: KR100704691B1; BR0306185B1; TW200404898A; TWI239355B; BR0306185A; CN1596315A; CN1596315B; EP1445334A1; KR20040058021A

Abstract

A raw material charging method for a bell-less blast furnace has a step of storing coke in at least one furnace-top bunker, a step of storing ore in at least one furnace-top bunker, a step of charging the stored coke while varying the tilt angle of a chute of a bell-less charging apparatus and turning the chute, and a step of charging the stored ore while varying the tilt angle of the chute of the bell-less charging apparatus and turning the chute. Control is made so that the discharge of the ore stored in the at least one furnace-top bunker is started when the discharge amount of the coke stored in the at least one bunker is between 5-50 mass% of a coke charging amount equivalent to a portion for one batch. Mixed raw material, mixture of ore and coke, is stored in one furnace-top bunker, and is charged in a blast furnace while a charging chute is being turned and the tilt angle of the charging chute is being sequentially varied.

Description

Bellless blast furnace] ^ ¾Λ ^ ¾

The present invention relates to a ¾λ method for a raw material for a blast furnace, and more particularly, to a method for ベル λ of stone and coatas in a blast furnace by inverting a bell-less system.

Normally, in a blast furnace in which molten iron is placed in the sea, fibers and coatas are alternately formed, and a packed bed having these layers is formed at the upper part of the furnace (hereinafter referred to as a shaft). The amount of one layer of the lithosphere layer and the coatas layer is called one charge ore and coatas, respectively. The ore and coatas for one charge are not necessarily injected into the furnace at one time, and the ore and coatas of one charge are divided into multiple times and then injected into the furnace. ing. These divided filite and coatas are called one batch of ore and coatas, respectively. In addition, from the lower part of the blast furnace, the empty ^ X blows wisteria-enriched air into the furnace and burns the coater in the furnace. Kaseki (hereinafter simply referred to as ore) is reduced and melted. Therefore, in order to improve the ^ 'property of the blast furnace, the ore in the shaft ゃ the ventilation of the packed bed of coatas ^: is a power to increase. As one effective means for ventilating the shaft, it has been known to mix ore and a coat and to work in a furnace. For example, Patent No. 2,820,478 discloses a method of uniformly mixing coke in ore in a bellless blast furnace by elaborating the timing and amount of ore and coats from ore hopper and coke hotspot. ing. In addition, as a means of preventing the increase of vented fiber in the blast furnace and keeping the gas in the furnace stable, the coke is moved to the center of the blast furnace and the flow of gas ascending in the furnace is greatly increased. It is also known that it is ^ J that makes it happen (this is called center-oriented). For example, Japanese Unexamined Patent Publication No. Sho 60-56003 ^^ indicates that 1.5 to 8 weights of coke is produced per charge. Disclosed is a technique to make the λ / ₀ in the center of the furnace ^^ midway. The center コー of this coatas has not only the effect of scavenging the ventilation ^: in the furnace, but also the fact that there is not much ore in the center of the furnace. This has the effect of avoiding or reducing the deterioration of the coats due to the so-called "solution loss" in which coke is oxidized by dioxin, which is made by reducing ore. In addition, the value of the coke itself can be lowered, the cost of converted coking coal can be reduced by using inexpensive low-rank coal, and the so-called “dead man” formed in the hearth can be obtained. It can also prevent the coatus wisteria from shrinking more than necessary, which helps to improve the flow of water through the hearth. Therefore, by combining the above-mentioned mixture of ore and coatas (hereinafter simply referred to as “mixing”) and the center of coke, it is possible to further increase the permeability of the shaft in the shaft fiber and improve the properties. However, in order to combine the mixture and the inside of the coater within the same charge, concretely, cutting out the raw material from the raw material, the ordinary batch of the coatas, the patch for the central charging of the coatas and the mixing It is necessary to perform the patch in three ways: This means that the coatus needs to be wound up three times in order to make one charcoal of coke in the furnace. Therefore, even if it is necessary to increase the cohesion of the blast furnace, even if it is necessary to increase the cohesiveness of the blast furnace, the capacity of the slag is insufficient for the ^ amount of s raw material, and the raw material is short. Go At such age, the center of the k タス tas and the mixture of the m タス must be 同時に at the same time, and the benefits of the low cost coking coal cranes from both of the ifB cannot be enjoyed. Become like

It is difficult to constantly maintain the properties such as the distribution of fibers in the ore ゃ coatas, the moisture content, and the mixing ratio of << 1 ^^^, etc., in the blast furnace. For example, if the mixing ratio of the cohesive stone in the ore changes, the sedimentation behavior ¾λ within the pan force changes according to the disclosure disclosed in Japanese Patent No. 2820478, and the outlet at the bottom of the pan force The mixing ratio of ore and coatas in the raw material discharged from the coal is low. By the way, in the hearth of the t & IB, means for increasing the particle size of the coatas to improve the flow through the hearth include: It is also conceivable to increase the value of. In other words, instead of preventing ore accumulation at the center of the furnace at the center of the coke 消費 and preventing the consumption of coats due to the loss of solutes at the center of the furnace, the coke fiber in the center of the furnace is made larger than the core diameter of the surrounding area. It should be noted that even at the age when Solross ^ occurs, coke reduction in the hearth can be prevented. If a dedicated coater コー λ ^ is used to center the regenerated coke ¾ ¾ コーの炉コーくこと大きくくことくこと大きく大きくでででOf diameter Cans are possible. However, the installation of a special 置 device that focuses on a different coat タス from the normal »^ A ^ device requires a large amount of equipment cost. In addition, even though large coke is sent to the center of the furnace through the bellless device, at present, large coke is prepared in advance, and this is different from the normal coke. As a patch, the punker provided in ^] 1 is ^^ raised and then ^^ into the furnace. As a result, the number of coke stones that are charged per charge increases. The number of patches required to feed one charge of raw material into the furnace An increase in power s is a problem because it is the rate-limiting factor in increasing the amount. Disclosure of the invention

A first object of the present invention is to provide a method for a bellless blast furnace capable of constantly and smoothly mixing a middle of a coat and a mixture of ore and a coat.

In the present invention, the properties of each of the specimens shelved in the blast furnace were changed: However, the blast furnace; The second purpose is to select the raw material for the blast furnace.

According to the present invention, when charging central coke using a charging chute in a bellless blast furnace, the in-furnace gas flow is formed in the central part of the furnace such that the coke is maximized in the central part of the furnace. The third purpose is to make the raw material of the bellless blast furnace which enables the stable blast furnace.

According to the present invention, it is possible to selectively provide coke having a larger particle diameter than that at the periphery to the central part of the blast furnace without separately providing a dedicated coater and increasing the number of raw material patches. The fourth objective is to make the raw material ル method of Lules blast furnace ^^. To achieve the above object, first, the present invention provides a raw material for a bellless blast furnace equipped with a bellless ¾λ¾ device having the following steps:

(a) Coke at least one breader! "

() Applying ore to at least one m-bunker;

(c) a step of rotating the chute of the IGIE base / reless unit while changing its tilt angle, and moving the stagnant coatas from the center of the furnace toward the wall of the furnace in the m ^ direction in the furnace;

(d) turning the chute at the bellless position while changing its tilt angle to move the difficult ore from the center of the furnace toward the furnace wall in the direction of the furnace; and (e) ffflB ^ At least one m-bunker |? W The amount of discharged coatus is between 5 and 5 O mass ^ο / ₀ of the amount of coke for one patch, and at least one t & IB ^; Second, the present invention makes it difficult to feed a bellless blast furnace equipped with a bell-less blast furnace having the following steps:

(a) Feed the mixed raw material of the ore and the coal to one bunker;

(b) While rotating the chute about the center axis of the blast furnace and changing the tilt angle of the chute sequentially, ェ the process of 混合 λ mixing the raw material mixed in the bunker into the blast furnace;

(c) Return 3 While the chute reciprocates at least once in the blast furnace ^ direction, the tfflSi mixed raw material ^ * which has been shelled to the bunker is $ 1 '' so as to be put into the tSIB blast furnace. The present invention eliminates the raw material process of a bellless blast furnace equipped with a bellless apparatus having the following steps:

(a) When the center of the bellless blast furnace is 0 and the furnace ¾5 is 1, the ^ chute of the 己己置レスレスInitiating the application of the coater using

(b) Dislike ^ Λ Every turn of the chute (^ Make the hard angle in the furnace 'ii! J sequentially ^ ¹ to make the coke ^: :) ¾ Fourth, the present at least 2 Cut out the costas stored in two | »ff, and coke the coke cut with the jaw provided at the bottom of the tank.丽 process; a process in which female coke is turned into a blast furnace from a furnace center to a furnace wall side through a bell-less ¾λ-shooting shaft while turning the ^ from the furnace center to the furnace wall side.ベル The coke sieving process is the same as the first sieving process of sieving the koutus that has passed through a sieve having a larger sieve (Α). It consists of a second sieve that sieves coke cut through a sieve with a small sieve (Β). |! 1 | 2 First, a certain amount of coke from the first sieving process is sent to the IQI ^ hopper, then a bow!枰 Measure the amount and shell it in the bunker provided at. Fifth, this effort is to reduce the coke from the first fractionation step, which sieves the coke discharged from the fourth bellless blast furnace raw material ^ through a sieve with a larger sieve (Α). amount, the raw material ¾Λ ^ ¾ downy Ruresu blast furnace which is a 5-5 0 weight ^_0/0 coke amount of the batch. Sixth, the present invention is a fiberless raw material for a bellless blast furnace equipped with a bellless apparatus having the following steps:

(a) f © coke to at least one S-pan force: 1¾;

(b) shelling the ore into at least one S bunker;

(c) One HI bunker mixed with ore and coatas :! ¾;

(d) The chute of ttilH bellless is swiveled while changing its angle, and the coke that has been sullen is turned inward from the center of the furnace toward the furnace return 15 IS;

(e) A step of turning the chute at the bellless position while changing its tilt angle, and moving the ore from the center of the furnace toward the furnace f in the ^^ direction in the furnace; and

(f) ΙίίΙΒ ^ at least one ^]! While the amount of the cortase shelled by the bunker is between 5 and 5% of the amount of one patch of coke ^^, ΙΐίΙΞat least one top panker Controlling to start discharging ore stored in the ore;

(g) rotating the shot and changing the tilt angle of the shot sequentially, and mixing the mixed raw material picked by the tins 顾 breader into the blast furnace;

() While the * ^ λ chute reciprocates at least once in the direction of the blast furnace ^^, the 制御 | ¾1 mixed raw material * which is put in the tanker is controlled to enter the ^ blast furnace. Description

Figure 1 is a cross-sectional view illustrating the bellless blast furnace com section.

Fig. 2 is a conceptual diagram for explaining the method of depositing raw materials according to Embodiment 1, and Fig. 2 (a) shows the timing of loading ore, and Fig. 2 (b) shows the position of ほ in the blast furnace. Is shown.

FIG. 3 is a cross-sectional view showing the deposition state of ^^ raw material in a furnace to which the raw material method according to Embodiment 1 of the present invention is applied.

FIG. 4 is a cross-sectional view illustrating a ^]! Portion of the bellless blast furnace according to the embodiment '2.

FIG. 5 is a cross-sectional view of an example in which a mixed raw material is obtained by applying the raw material method according to Embodiment 2; FIG. 6 is a diagram showing the arrangement of ^ shots in the bellless blast furnace according to weaving mode 3.

FIG. 7 is a cross-sectional view of the in-furnace transmutation using a ^ -shute according to Wei form 3. FIG. 8 is a graph showing the gas utilization distribution in the blast furnace related to & 3.

FIG. 9 is a graph showing the distribution of the coarsening rate of the central coat as a function of the form of Wei morphology.

FIG. 10 is a diagram for explaining a raw material removal according to the fourth embodiment.

FIG. 11 is a graph showing the relationship between the amount of coatas discharged from the bunker (%) and the ratio (%) of 55 or more in the sample coatas in Example 4 of SS. Forms for making inventions ^!

The inventor has made extensive efforts to achieve each of the above objects, and has put that play into the present invention. That is, according to the present invention, a chute having a high-level bell-less position is turned while changing its tilt angle, and a coke or stone having been subjected to a plurality of S-pan forces is formed in the furnace. When moving from the furnace center to the furnace wall in the 向 direction, the discharge amount of the coatas, which was one of the IGSBm pan forces, was between 5 and 50 mass% of the amount of coke for one patch. From the time of 赃, the discharge of the ore in another furnace top pan force is started, and the simultaneous release of the coat and the ore is referred to as the raw material method of bellless blast furnace using fiber as the method 1).

In the form 1 of the actual gun, the blast furnace bellless シュート λ ^ is rotated while the tilt angle is gradually increased gradually from zero, which is the vertical state, to turn! When the amount of coke stored in one of the pans reaches 5 to 50 mass% of the amount of coke for one patch, the discharge of another ore in the pan is started. However, since the coat and the ore are simultaneously mixed, only the coke is filled near the furnace center, and the mixture of the coke and the ore is filled around the furnace wall. As a result, a mixture of coal and ore · β ^ λ, the raw material ^]! Canceled due to the winding ability. '' The present invention relates to a raw material for a bellless blast furnace, in which ores and coats are supplied as raw materials to a blast furnace using a bellless ¾λ ^ device. :: Rotate the shunt around the blast furnace center axis and gradually change the tilt angle of the shunt to remove the mixed raw material from the bunker while the chute reciprocates at least once toward the blast furnace. This is the method of bellless blast furnace raw material (hereinafter referred to as Wei form 2). Ιίί In male form 2, as a suitable scythe, it is preferable that the shot start the mixing of raw material from the blast furnace, or start the mixing of raw material from the center of the blast furnace.

The present invention relates to a method of a bellless blast furnace, in which an ore and Ζ or a coat as raw materials are introduced into a blast furnace by using a Perless apparatus. At this time, the center of the bellless blast furnace was set to 0, and the furnace wall was set to 1. In response to the unoccupied situation, the start of Kotas started from ^ f standing corresponding to ο. This is a material for bellless blast furnaces (hereinafter referred to as Difficult form 3), in which the tilt angle is sequentially shifted into the furnace 'i at each turn. In the present invention, coke stored in a plurality of shells f¾ is cut out, sieved with a sieve provided at the bottom of the tank, the coke on the sieve is weighed through a hopper, and a pan force provided on the furnace top is sequentially passed through, and a chute at a venoreles is placed. When turning the chute from the center of the furnace to the blast furnace through the blast furnace 內, the mesh of the sieve provided in the lower part of the tank of the part of the tfilB shell f ^ tt is another! ? ^ f larger than the mesh, when fibrous coke from these shells f¾ tank to the weighing hopper, first fifi ^ large eyes! After transporting the coke from f by a fixed amount to the hopper, the coke from tGIB and other 15 is transported continuously to reduce the amount of coke for one patch, and the blast furnace is passed through the anchor ^ This is a method of raw material for the Be / Leles blast furnace (hereinafter referred to as difficult form 4). The amount of co task from the ^ \ ΙίίΙΞ ^ eyes big IMf is, it forces S preferably 5-5 0 weight ^_0/0 of the total Kotasu amount of the patch. (Hereinafter referred to as weave form 5)

According to Wei's forms 4 and 5, the existing bell-less equipment was used without separately installing a dedicated coke unit. Even if the number of raw material patches was not increased, the particle size was larger than that found in the periphery. Large coke can be directed to the center of the blast furnace.

Preferably, in the weave forms 1 to 5, the raw material の ^ method (hereinafter referred to as weave form 6) of a bellless blast furnace in which at least three pans are installed in parallel. Form of Knowledge 1

Hereinafter, an embodiment i of the present invention will be described with reference to the drawings.

First, Fig. 1 shows the vertical section of the blast furnace equipped with a bell-less device.原料 The raw material 2 (stone or coke) fed to the baking force 1 is called a flow gate 3, and the amount of discharge falls through a gate whose opening is haze, and turns through a vertical chute 4. (Usually referred to as SHUT 5). This shunt 5 rotates horizontally around the center axis 7 of the blast furnace 6 and changes its tilt angle (Θ) with respect to the center axis 7. Can be. By rotating the chute 5 while turning the raw material Λ and gradually changing the tilt angle 0 in a stepwise manner, a wide deposition surface can be formed in the furnace to discharge the raw material. Normally, as the tilt angle 錄, the angle of 錄 is set in advance, a notch number is assigned to each angle, and when turning the chute 5 to feed the raw material 2, the notch at each turn from the start By deciding, the same kind of raw material can be moved to a certain position. Also,; 1 ^ 11 bread force 1 is 2 in 1a and 1b in Fig. 1, but there is also ^^ which is 3¾¾ higher, and 1 patch of raw material 2 is rolled up in each, Shellfish can be made.

Weaving mode 1 is the 高 method of blast furnace raw material using the Kakar Berle ¾λ ^ device, in which the coke is tilted from the center of the furnace to the furnace inversion while the tilt angle is changed by jio. The ore is also simultaneously mixed in during the operation. Specifically, the space between coke and ore is as shown in Fig. 2 (a). In other words, the furnace pan force (for example, la) force that is difficult to coke The coke is discharged, and the amount of discharge from the pan force of the cortus is one patch of coke that was shelled to the II pan force ^ Tara summer to 5-5 0 weight ^_0/0 of lambda *, another has贿ore; pan force (e.g., lb) starts discharge of the power ore. As a result, the center コー of the coatas is initially formed, and a mixture λ of the coatas and the ore is formed on the way.

FIG. 3 shows an example of a raw material deposition state in a furnace formed by performing such a process. Here, the symbols C and O in FIG. 3 indicate coke and ore, and the subscript indicates the number of patches. Fig. 3 shows the age at which coke and ore were mixed after initially charging the kotas in three turns.Since immediately after the start of coke, only coke was fed to the furnace center side. deposited layer C ₂ coke only is formed in the furnace central portion, since then charged ore with Kotasu the mixed layer Cs + Oi coke及Pi ore is formed. This ^^, the coke formed earlier, forms a mountain in the center of the furnace, and then mixes the coke and ore into the furnace more than that, so ^^ The mixture does not enter the coke mountain in the center of the furnace. As a result, a central coke layer where only the coater is deposited is formed at the center of the furnace. In addition, since the ore to be added later is placed on the OPMJ outside the central coke layer at the same time as the coater, a mixed layer 0 ₂ ÷ 0, It forms.

In the first embodiment, it is preferable that the opening of the {δ} gate 3 be difficult so that the coke and the ore are discharged at the same time. However, the coke stone Since the discharge time from the pan force 1 is determined by the amount of water that flows, the opening of the flow control gate 3 may be adjusted appropriately.

In the example of Fig. 3, the second patch of the coatus and the first patch of the ore, which are obtained by dividing the coke and ore into two patches, respectively, are partially extracted and formed to form a central coat and a mixed layer. However, the present invention is not limited to this, and the coax and the ore are each 1 char each; in dividing the ^ f patch into ¾ rf inside the furnace ^ λ, the layer of the cortus warworm at the center of the furnace and mixing around it The ¾λ method of forming a layer can also be employed. In addition, after the coke is divided into two patches and the entire furnace is covered with the coke patch C1, the ore is charged and mixed in the middle of the second patch of the corus. Can be.

Furthermore, in the first form, the timing of the start of the discharge of coke from the ore aging from coke is started, and the release of coke from the coke is started from another pan of coke. It was within the period when 5 to 50 mass% of the coatas was discharged, for the following reasons.

If the amount of coke discharged is less than 5 ma ss ⁰ / o, the amount of coke used in the center of the furnace is too small, and a mixture of coke and ore, which will later be lambda. The coke layer ¾Λ ¾Λ コーコー、タスコー, and the effect of the center of the タスタスコー得る得る cannot be obtained. Also, if the mixing of coke and ore is started after the coke of more than 5 omass% is mixed, the amount of coke in the mixed cannot be reduced to 10 ^^ Η ". In addition, it is difficult to obtain the effect of this.In addition, there is a part without stones in a wide area in the center of the furnace, and the furnace cannot be put on the shelf, and the weight can be increased by force. Jong form 2

FIG. 4 is a cross-sectional view mainly showing a part of a blast furnace having a bell-less blast furnace (hereinafter, referred to as a bell-less blast furnace). In 园 4, the angle between the blast furnace center axis and the swing chute (hereinafter referred to as the tilt angle) is set to 0.

The bellless blast furnace is separated from the l panker 1 by a force S. However, one of them;) ^! The Kunhei raw material 20 is discharged from the bottom of the furnace top pan 1, adjusted to a predetermined flow rate when passing through the flow rate control gate 3, and then supplied to the Λshout 5 via the vertical shout 4 ′. You.

The shot 5 rotates around the central axis of the blast furnace, and feeds the mixed raw material 20 into the blast furnace 6 while changing the tilt angle Θ. Arrow a in FIG. 4 indicates the turning of the chute 5, and arrow t) indicates the drop of the mixed raw material 20. When the mixed raw material 20 is poured into the blast furnace 6 in this manner, the x chute 5 is swirled, and the f f difficulty angle 順次 is sequentially changed, so that a wide area on the raw material deposition surface 8 of the blast furnace section is obtained. The mixed raw material 20 can be removed over a period of time.

Figure 4 shows the bellless blast furnace with two bunkers 1 installed! Form 2 can also be applied to a bellless blast furnace with three or more HI bunkers 1 installed.

In the present invention 2, the mixed raw material 20 in which the ore and the coke are mixed is shelled in the bunker 1; the method is not limited to a specific method. For example, the ore weighing hopper (Fig. ¾¾ ~ ¾¾rf) and the coater weighing hopper (Fig. ^: ず), respectively; Tl ^ S stone and coke are simultaneously cut out at a specified ratio, and the conveyor (Fig. ^ Gffl can be performed by a conventionally known method such as a thigh to a ^ m breader 1 via a thigh.

However, due to the difference in the properties of the ore and the coater, the mixing ratio of the mixed raw material 20 in the HI bunker 1 cannot be changed locally. In other words, the ore has an average diameter of 15 囊 fiber, while the coatas has an average of 50ramg ^; ^, so when the mixed raw material 20 is introduced into the S bunker 1, However, the relatively large ぃ coatas rolled in the direction of 顾 bread force, and the ore with relatively small particle size was deposited at the 位置 λ position.

Further, when the mixed raw material 20 is discharged from the lower part of the bunker 1; of the mixed raw material 20 shelled in the bunker 1, the vertical direction extends from the lower part located at SLh of the discharge port to the bottom part 1 " The mixed raw material 20 distributed in the water is difficult to be discharged, and when the deposition level immediately above the discharge port is reduced, the mixed raw material 20 flows in from the surrounding area (so-called Juanno reflow), and the discharge proceeds. "Ru.

As a result, when the mixed raw material 20 is poured into the bunker 1 ', the stone and coatas are mixed at a predetermined ratio in advance. And the coke mixing ratio is ¾1H ". That is, the ratio of ttU stones increases in the early stage of discharge, and the ratio of coatas in the discharge crane!] In this way, the mixed raw material 20 becomes ^! It is unavoidable that the mixing ratio 比率 occurs when the water is discharged from the furnace.

In this way, the mixing ratio is reduced while the mixed raw material 20 is discharged from the m-punker 1. Therefore, when the mixed raw material 20 is introduced into the blast furnace 6 through the chute 5, the ore in the mixed raw material 20 is reduced. Ishizaki coatas are not evenly distributed on the raw material deposition surface 6, causing segregation in specific areas. Therefore, in the present invention 2, in order to prevent segregation on the raw material deposition surface 8, the mixing raw material 20, which is formed in a single TO panker 1, is started, and then, the * is ended. By then, the shot 5 is swiveled around the central axis of the blast furnace, and the driving angle θ is sequentially changed at a force f, and To and from the blast furnace at least once. However, when changing the tilt angle Θ, turn the 5 shot 5 once at each tilt angle.

In other words, after the shot 5 is swirled once around the blast furnace center axis at a predetermined tilt angle 混 to display the mixed raw material 20, the tilt angle 0 is changed to increase the ¾λ of the mixed raw material 20. ,)> The ¾¾Λ chute 5 is reciprocated at least once in the half blast furnace direction until the 原料 of the mixed raw material 20 in the pan 1 is completed. Therefore, the mixed raw material 20 is supplied to the arbitrary position on the raw material deposition surface 8 twice or more while the mixed raw material 20 in the single breader 1 is being supplied.

In the difficult situation of the bellless blast furnace, the tilt angle 0 of the chute 5 is usually set in several steps and each number (hereinafter referred to as a notch number) is assigned. Therefore, by turning the chute 5 once with the predetermined notch number to make the mixed raw material 20 and then changing to the next notch number and threading the 合 of the Kunli raw material 20 with the existing bell-less, Form 2 of ^ できる can be formed in the blast furnace.

FIG. 5 is a schematic cross-sectional view of an example in which the mixed raw material is obtained by applying the second embodiment. In FIG. 5, the mixed raw material 20 is started from the blast furnace wall side. In this example, the mixed raw material 20 was supplied while gradually decreasing the tilt angle Θ, the mixed raw material 20 was applied to the center of the blast furnace, and then the mixed raw material 20 was reduced while increasing the tilt angle Θ. Therefore, in Fig. 5, the mixed raw material 20a formed in the m-punker 1 starts to be mixed with the mixed raw material 20 in the first turn (hereinafter, referred to as the first round) of the c¾A chute 5, and The mixed raw material 20b, which was located on the blast furnace wall side on the raw material deposition surface 6 and was subjected to i ^ A in the twelfth rotation of the chute 5 (hereinafter referred to as the twelfth rotation), was subjected to the first rotation 1¾¾λ Place above mixing thickener 20a.

FIG. 5 shows a state in which the mixing of the mixed raw material 20 has been completed in the twelfth turn. However, since the chute 5 turns once around the blast furnace center axis at a predetermined tilt angle Θ, the mixed raw material 20 is drawn on both sides of the blast furnace center axis as shown in the sectional view of FIG. However, only one side is shown in FIG. -Fig. 5 shows an example in which the shot 5 is turned 12 times while the mixed raw material 20 put in the bunker 1 is fed. In the Wei form 2, the shot 5 is turned. The number is not limited to a specific number.

FIG. 5 shows that the shot 5 reciprocates once in the direction of the blast furnace while the mixed raw material 20 charged in the pan 1 is fed. It is sufficient that the gate 5 makes at least one round trip to the blast furnace ^^. Therefore ^! During the feeding of the difficult mixed raw material 20 シ, the shot 5 may go back and forth once in the direction of the blast furnace, and may then go back and forth several times, or may go back and forth twice or more.

That is, the mixed raw material 2 in ^ H bread force 1. The number of times that SHUT 5 turns around the center axis of the blast furnace and the number of times SHUT 5 reciprocates in the direction of the blast furnace ^^ during 缝 is appropriate. Adjust the flow rate of 20 with the flow rate fiber gate 3.

Fig. 5 shows an example of starting the mixing of the mixed raw material 20 from the blast furnace wall side.However, the charging of the mixed raw material 20 was started from the blast furnace rule, and the tilt angle 順次 was gradually increased. The mixed raw material 20 may be charged into the blast furnace wall while the mixed raw material 20 is charged while gradually decreasing the tilt angle Θ.

In this way, while mixing the mixed raw material 20 which was difficult in the bunker 1, the mixed raw material 20 was placed at an arbitrary position on the raw material depositing surface 6 two or more times. Even if the mixing ratio of the mixed raw material 2'0 fluctuates (for example, the ore ratio increases), the behavior of the mixing ratio is reversed (for example, the coatas ratio increases) in the second and subsequent ¾Λ. Therefore, the ore and the coatas can be distributed on the raw material deposition surface 8 at a constant mixing ratio. As a result, it is possible to improve the air permeability of the difficult zone, suppress hot metal 1 and obtain hot metal of uniform quality.

Actually, when a given notch number is used once ^ 、, the mixed raw material 20 spreads in a half ^ direction on the raw material: 8, so that the charging cut 5 reciprocates in the ^ ^ direction. Same — You don't have to do it. It suffices that the input shot 5 reciprocates at least once in the predetermined width in the direction. Wei form 3

As shown in FIG. 6, in a bellless blast furnace 6 having a shell 5, raw materials such as ore and coke are formed from HI through a shell 5 to form a furnace sedimentary layer 14. .

The ¾λ chute 5 is adjusted so as to have a tilt angle of 0 with respect to the furnace center axis at the furnace center 6a, and feeds the raw material while rotating around the furnace center axis. Then, a raw material deposit of Dotna is formed around the furnace center 6a. In addition, the raw material to be used can be applied to any part of the S surface by changing the angle of the chute.

Adjustment of the ¾Λ position toward the furnace is performed by adjusting the tilt angle の of the shot 5. Normally, a notch is given to each of the predetermined angles in advance, and when the raw material is swirled (rotated) about the furnace central axis, the raw material starts to flow from the starting point. The notch number is determined for each turn of the Ute, and the pattern of the notch No. 9 is controlled to control the pattern of the raw material to the furnace.

The ^: lower position of the raw material according to the tilt angle of the chute is investigated in advance when the raw material is filled in the furnace before the start of the blast furnace key. Alternatively, taking into account the centrifugal force when the raw material flows down on the chute and the top of the furnace gas, the falling of the raw material is calculated dynamically to determine the position of the raw material. it can.

By the way, considering the コー of the central coater, if the knitting angle is reduced for each turn from the start and the 行なう λ of the coater is performed, as shown in Fig. 7; The eye coke ^ Λ position is closer to the furnace. When the central coke is formed in this manner, the coater in the second turn goes down the furnace center side from the coater in the first turn and then enters the furnace. At this time, relatively coarse-grained ones of the second-turn coater enter the furnace.

In other words, as the turning progresses, the fall position of the coatas is moved toward the center of the furnace, so that the fallen coat state flows into the slope from the fall position toward the furnace and is inserted. The coarsest of the coats will accumulate in the center of the furnace.

At this time, if the drop position of the first turn and the second turn is the same, the coke of the second turn will be divided into the furnace center side and the inversion of the furnace and flow into the furnace. Of these, a part of the coarse-grained costas will enter, causing a problem. However, as in condition 3 of », as the swirl progresses, the costas drop position should be moved closer to the center of the furnace. Therefore, all the coarse particles can enter the furnace center side, and this is the meaning of strengthening the segregation of the coarse coat at the furnace center.

Also, in Wei's form 3, the non-dimensional report that the center of the blast furnace is set to ^ λ open and the center of the blast furnace is set to 0 and the furnace wall is set to 1 is set to 0.1 to 0.4. Is preferred.

If the opening of the tree is larger than 0.4, the amount of coke separated by one turn will decrease even if the center coater starts ^ ^. The effect of coarse-grained coke on the part is poor. Also,

If it is smaller than this, the distance over which the given coats will flow will be shorter, and the effect of causing as prayer will be reduced.

In order to verify the preferred range of ¾Λ open Tatsu置of the above center coke ', the inner 1/5 scale of the ^ ¾Λ¾ location of 5000m ^3-class blast furnace;! Performs a ^^, center co-one task of ¾Λ open ½ί standing We investigated the coke roughing ratio in different directions. Figure 9 shows the results. Here, the coke shading rate means that a predetermined amount of sampling is performed at each location after ^ A ^ Then, the coke cloth was measured, and the ratio of the coarse particles in each sample was shown with coarse particles having a particle size equal to or larger than the media for the obtained coke.

In each fiber, the cox was turned in 5 turns. Here, the ¾Λ position was moved to the center of the furnace by 0.01 in a non-dimensional manner every turn, until the ¾Λ opening was set to 0.05 and 0.1 for the ¾Λ 81. In the case of the open and closed positions of 0.4 and 0.45, the ¾Λ position was moved in the furnace by 0.05 in a non-dimensional manner every turn.

Open ^ ί No standing ^^ at 0.05 position, coke after the second turn was deposited in the direction of the furnace wall ^ τ from the center of the furnace, so it was practically to the center of the furnace ί ^^ There was no significant difference from the above, and even in the case of 率 1, the gross ratio increased toward the furnace !! 1 from the furnace center.

In addition, it is unpopular at the age of 0.45. In the range of ~ 0.3, the tasting rate was not so different, and the result was that the prayer was not large. On the other hand, while the cracking position is in the range of 0.1-0.4, and the unfilled range is 0-0.2, the stat of 70% is coarse, and the bias of coarse particles near the center is strengthened. I understand that it is. Next, Embodiments 4 and 5 will be described. When the inventor uses the bellless apparatus to feed the raw material into the blast furnace, as shown in FIG. By changing the angle (Θ) between the shot and the center axis of the furnace every time, it was found that the furnace can be uniformly moved in the circumferential direction and to any position in the furnace direction. In other words, by setting the tilt angle (ほぼ) to almost 0 ° and starting the Λ of the から from the state that the Λ chute is almost vertical, and gradually increasing the 毎 for each turn, The coke deposited at the start of ¾λ is deposited at the center of the furnace, and can be made to be in the furnace ^! Ϋ¾1 "as time elapses. If coke with a large initial diameter among the δ1 patch coats to be discharged can be discharged efficiently, coke with a large diameter at the center in the blast furnace can be detected in five ways.

In order to make the size of the first coat of a patch larger than the diameter of the later coat, the following procedure can be used.

In the IT departments, which have a blast-furnace coat, there is a 21-power S through a sickle, and the mesh is set to 35 mm. Therefore, the mesh of some f¾ † f is set to, for example, 55 mm, which is larger than the mesh of the other shellfish ^ ft. In this way, when transporting coke from these clams 22 to the weighing hoppers 23, as shown by ^ 1 "in Figure 10, first the large clams 22 After a certain amount of the cotter 24 a has been sent to the hopper 2 3 ^ by a fixed amount, and the coater 24 b from the other S is continuously transported, the particle size 5 Coke 24 mm with coke of 5 mm or more In addition, coke 24 b with diameter of 35 mirU¾ ± can be assigned one patch. Then, after the amount of the coats for the one patch is continuously reduced and cut out from the lower portion of the hopper 3 and sent to the pan force 1 at l, the same applies within the pan force 1. Lower side ί2ί¾5 5 mm or more coatus 2 4 a force Further, ίί¾ ^ coater 2 4 15 with 35 mm or more deposits 1 patch ^ *. Therefore, as shown in Fig. 1, when these coats are tilted from the van force 1 through the chute 5 through the chute 5, the fibers of the coats in the blast furnace average in the center from the periphery. It becomes big.

In addition, in Embodiments 4 and 5 of 61, the amount of the coater 24a having a particle diameter of 55 mm or more is empirically estimated by the height of the weighing hopper 23. Further, the amount of one patch is preferably set to 5 to 5 0 mass ^_0/0. In less than 5 mass ^_0/0, since small large amount of coke of particle size of the furnace center portion Rere, Kotasu normal雖the strength crowded Re furnace center portion ¾, to form the central flow to a non-sufficient , 5 0 mass ⁰ / o by more than, although the stronger the central flow is sufficient, the increase of blast furnace ^ impossible for ij co one box amount occurs as undersize of Kotasu; because ¾ case also occurs. The difficult forms described above:! To 5 also exert their effects individually, but their combination makes it possible to more effectively fiber-distribute the material distribution of the blast furnace. For example, in FIG. 3, the Wei fourth the layer, the form 1 of the flame to form 3 of the flame to Ca + C ^ layers C ₂ layers, it can be applied to Embodiment 2 of the flame to 0 ₂ layers.

Fiber example 1),

Using a blast furnace equipped with a 500 000 Om ³ bellless reactor, the amount of ^^^ was increased. In this blast furnace, the working angle of the ttJf ^ A chute corresponds to the notch number as shown in Table 3 by ^ 1 ". The larger the notch, the smaller the angle of difficulty, so immediately after starting, 2 At the 0 notch, the ¾Λ shoot is almost vertical, and then ^ is performed while gradually increasing the I angle.

Also, ^^^ increased the order in three levels (cases 1-3) of 1.8, 2.0 and 2.1 in the Kakar blast furnace. «: 1.8 and 2.

The dish of No. 0 was made with the raw material ¾Λ method, and the dish of 2.1 was made with the raw material relating to the present kiyoshi ϋ. Here, Idegami-dani is a numerical value obtained by dividing one sunrise ffe * (t / d) of the blast furnace by the in-furnace fiber (m ³ ). Table 1 shows the ¾Λ ^ cases of coke and ore in this ^ ^ (batch, 、 amount of patch, notch of shoot; pan force).

First, case 1 is a dish of mi.8, where only the coatas is

After ¾Ramuda, and Λ the Kotasu for central ¾Ramuda ^ as C _2, then the pre-mixed,) 'm ^ mixed to down force of C ₃ which had been dragon Kotasu及Hi O! Ore simultaneously ¾Ramuda Thus, a mixed layer was formed. Then ¾Λ only ore to Rokoboshi 0 ₂ to form a Ataekobi ore. Ore of the 0 ₂ is for those among the ore small ^ of, in particular furnace wall ^ Λ. The charging of “51” was set as one charge, and ¾λ was repeated. This is a slave, which corresponds to performing the center and the mixing of the coater individually.

In this case 1, the amount of ore reduced per unit time is increased by increasing the amount to the blast furnace with the aim of increasing the output to 2.0 in order to increase the amount of solution. However, in this case, it took a long time to lift up the furnace top bunker by dividing the coke for one charge and ore into 5 patches, and the deposition surface in the furnace was at an almost constant level. The supply of raw materials became difficult, and it became necessary to make the fiber for the winding time.

Therefore, the formation of a mixed layer with the previously mixed coats and stones! Then, as Case 2, we decided to roll up four patches per charge. Also, at that time, it was necessary to increase the treatment ratio (the ratio occupied by ore) to 82% by mass in order to improve the reduction within the ferrite. Table 2 shows the ^^ of Case 2; however, in raising the dagger, the mixing of Case 1 was abandoned; despite the increased ratio, the number of ventilations in the furnace was 1.0. Ascending from 5 to 1.17, ventilation '14 is the case 1 ^ ^

Accordingly, fractionated raw material ¾Λ method according to the present invention, the coke as C ₂ from the furnace center between the furnace section, by simultaneously ¾Λ ore from 6 swivel eye during ¾Λ the ¾λ chute 1 3 turning urchin did. This is about 4 times the amount of C ₂ ^ Λ

This means that the coke and ore kelp were opened. The ^^ result of Case 3 is combined with Case 1 and Case 2 in 19 | 5¾2; ^.

In Table 2, the ratio of coals and pulverized coal are the amount of coke and coal coal (kg) converted to produce 1 t of hot metal .. The SS ratio is the mass ratio of ore, etc., extracted from iTO. It is a numerical value shown as ⁰ / _{0. The} coax Ι で is the tumbler index.

It is represented by the following equation.

[{(ΒΡ / 98.0665 + 1.033) χ10000} ² -{(ΊΡ / 98.0665 + 1.033) χ10000} ² ] / (1.033xl0000xLSL0)

I (BGV / SAVE) ^{L 7} x273 / {(SGT + 273) / 2 + 273}

BP Pulse force [kPa]

IP J 'm force [kPa]

^ H [ _m ] of LSLOT stock line and tuyere

BGV Bosch gas amount CNmVmin]

SAVE Average product in blast furnace Cm ² ]

SGT: representative gas of shaft part ¾¾¾: 1000 ° C From Table 2, it is clear that according to the present invention, the tapping ratio was increased to 2.1. It should be noted that the coke center ¾Λ and the mixing could be performed at once without interrupting the mixing in the middle, and the ventilation rate could be increased to the same level as in case 1. Batch internalization * Notch number per turn of charging shot Remarks

Bread strength ·

C AC _l (coke) 24 33344556678910

₃ dlUj

1 BC _a (center coke) 5 1617181920

Mix beforehand AC ₃ (coke) 1Λ

1615151 13121110

Force Cfc pending

1 Οχ (ore) 103

Put out,

B 0 ₂ (ore) 54 56 789

Ke A c _x (coke) 33 33 344 556 678 910

00

1 B c ₂ (center coke) 6 1617181920

Ao ₁ (ore) 105 161514131211109

2 B o, (stone) 54 56 789

Ke B c _v (coke) 24 33344556678910

The present invention

1 A c _s (coke) 15 202019181716151 13121110 Corresponding, Oi

From the middle of c _a BO! (Stone); 103 16151413121110 at the same time

Discharge

3 A 0 ₂ (ore) 54 56 789

* In each case, the burden is charged from the upper batch to the lower batch

Table 2

Table 3

Example 2)

When forming an ore layer and a coke layer alternately in a bellless blast furnace (of which 5000ιη ³ ), as shown in Fig. 5, one mixed raw material 20 in which coke was previously mixed in ore was used to form the ore layer. The l bunker 1 was shelled f¾. Koh one task of mixing raw materials 2 in 0 was set to 16 mass ^_0/0 relative to the total amount of coke for one cycle / Les content of the ore layer Contact Yopiko Kusu layer.

When the mixed raw material 20 is transferred through the charging shot 5, the shot 5 is turned 12 times while turning! The flow rate of the mixed raw material 20 discharged from the bunker 1 was reduced by using the low flow rate gate 3 so that the mixed raw material 20 in the bunker 1 was reduced. In other words, as shown in Fig. 5, ¾Λ is started from the blast furnace conversion (that is, the mixed raw material 20a made in the first swirl), and the mixed raw material 2 is gradually reduced while the working angle 0 is gradually reduced. After charging the mixed material 20 to the predetermined angle in the direction, the mixed material 20 was added while the tilt angle 順次 was gradually increased. In this way, ¾Λ is started from the blast furnace conversion, and the shot 5 reciprocates once in the blast furnace ¾ ^ direction and returns to the blast furnace wall side again (that is, the mixed raw material 2 O b charged in the twelfth turn). l The mixed raw material 20 in the bunker 1 was completely finished. This is an invention example.

On the other hand, as a comparative example, in the same manner as the invention example, when mixing the raw material 20 ¾r¾A, the flow control gate 3 was set so that the mixed raw material 20 * in the bunker 1 was increased while the ¾X shot 5 turned 12 times. It was haze. Then, start mixing from the blast furnace wall side and gradually decrease the tilt angle Θ while gradually mixing the mixed raw material 20, and in the blast furnace ΐϋ 原料パン混合混合パンパン混合The charging of was completed.

The bellless blast furnace that was racked up here is operated with the tilt angle 0 of the shot 5 set with the No. ^ symbol. The correspondence between the notch number and the tilt angle Θ is the same as that shown in Table 3.

Table 5 shows the notch number settings when the mixed raw material 20 is ^^. Note that the notch number settings in Table 5 indicate that the vehicle turned once at each of the notch numbers with a force of 5 times s. For example, in the comparative example, the notch number "5" is described twice consecutively because the notch number "5" "^ λ Shoot 5 turns twice and then the next notch number" 6 " | ^ Schnitt 5 Power S

Note that when Ru form coke layer, both the invention examples and comparative examples, the amount corresponding to 10 mass ^_0/0 for all code tasks of one cycle in the blast furnace center ^ lambda (the so-called center co box) The remaining coke was evenly distributed in the upward direction. In other words, the sequence is 3 packs of coke soda ore (mixed raw material 20).

For each of the invention example and the comparative example, the coke ratio, the pulverized coal ratio, the feed rate, the hot metal concentration, and the Si concentration in the hot metal were measured with a difficulty of 53 times. The results are shown in Table 2. Note that the code in Table 4 The ratio of pulverized coal and pulverized coal is the ratio of the total amount of dragonfly and the total amount of pulverized ^^ in the total output fiber for 5 days. The blast, rn, and the Si concentration in the hot metal are the average values of the values measured (6 to 7 times / day). Variations in measured values are also shown for hot metal release and hot metal Si M ^.

As is evident from Table 4, in the invention example, the hot metal separation and the dispersion of Si in the hot metal were more difficult than in the comparative example. Therefore, in the invention example, even when the blower temperature was reduced by 30 ° C. as compared with the comparative example, the same hot metal was obtained and could be stabilized.

Table 4

Comparative example Invention example

Noch number of mixed material loading (^ setting 5-> 5 → 6 → 6 → 7- → 7 → 8 → 8-9- ^> '10 5 → 6- * 7 → 8 → 9- * 10- * 8- → 7- * 6- * 5 Coke ratio (kg / ton) 403 403

Pulverized coal ratio (kg / ton) 99 99

Ventilation temperature average value (in) 1050 1020

CO

Hot metal temperature average C) 1496 1490

Variation (in.) 6 3

Average Si concentration in hot metal (mass ⁰ 6) 0.28 0.25

Variation (mass%) 0.07 0.05

Fiber example 3)

The inner forehead 5000m ³ order; in ^ blast furnace, was woven the觀in shows matter in Table 5. Here, in the comparative example, the ¾Λ chute was tilted at 0 ° and concentrated on the center of the furnace, corresponding to ¾Λ of the central coater. On the other hand, in the example of the present invention, the ¾λ open; 置 standing was set to 0.3, and the central coke was moved by 0.03 for each turn without any change in the center of the furnace.

At each key, the gas inside the furnace at each position from the furnace wall to the center of the furnace was sampled while sending a sonde installed at a level 5 m below the HI deposition surface of the blast furnace shaft toward the furnace. Then, CO gas and co ₂ gas were analyzed.

The gas utilization rate is

Gas utilization rate (%) = {co ₂ a%)} / {co (w%) + co ₂ (w%)} 値 ΐ ο ο, where gas utilization rate is large in the blast furnace It can be considered that the ratio of ore becomes relatively large.

Figure 8 shows the calculation results of gas utilization rate.

As shown in Fig. 8, in the comparative example, the gas utilization rate at the central part of the furnace is higher than that of the surrounding area (up to 0.2% without any ^^^). This is because, as a result of the central coke being placed in the center of the furnace, the coarse particles in the coater penetrated into the periphery of the center of the furnace, and the furnace gas flow in this area was strengthened. It is probable that the ore stratification S collapsed and reached the furnace center.

As a result, in the jewel of the comparative example, the gas flow in the center of the furnace became unstable, and the fuel ratio became 507 kg / t mm.

On the other hand, in the example of the present invention, it can be seen that the gas utilization rate at the center of the furnace was as low as 15%, and a strong: ヽ gas flow was formed at the center of the furnace. And, because of the stable distribution of the water in the furnace, even if the TO ratio is reduced to 498 kgZt, the edible g equal to or more than that of the comparative example becomes edible g.

Further, as is clear from Table 5, in the example of the present invention, the cost was lower than the ratio, the amount of charcoal could be increased, and the total fuel ratio could be increased.

Fiber example 4) ''

With bell-less ¾Λ¾ inner having a location is 1 0m ³ ¾g of ^ ^ blast furnace was performed for the raw material. The raw material used here was blast furnace coatas, which is commonly used as a hard stone (symbol Ο) and as a coater (symbol C). The quality of the ore / coats at that time SJ: dashi, 0 / C = 3. The ore was charged 1 patch per charge, and the coke was charged 1 patch 1 charge. According to the raw material method according to the present invention which is frustrated,

(All sieves of ff are set to 35 mm).

Then, the cortus falling from the chute at the start of the cortus is captured by the sampler at regular intervals, and the resulting fibers are measured. The horizontal axis in Fig. 11 indicates the amount of cortus discharged from the pan force (缝the 1 0 o ^o / ₀ and the) at ^_0/0, the ratio of 5 5 m in clam one task the ordinate (%). From FIG. 11, it is clear that according to the present invention, the initial ¾λ, that is, the amount of deposits in the center of the furnace becomes larger than that of the normal 通常 method.

^ ± Availability

According to Difficult Mode 1, it is possible to always simultaneously mix the coke and the ore and the center of the koutus at the time of raising the height in the bellless blast furnace. As a result, it is possible to effectively prevent an increase in pressure iron in the furnace, which tends to occur when performing high 继 ^^, and to increase the shelf volume of mrn'ju iron and other high !? Increased production is possible.

According to Form 2, even though the fiber distribution of each Slg material shelved in the blast furnace and the properties of the water contained varied, the ore and coke mixing ratio on the raw material deposition surface in the Takai m part was constant. To control the hot metal and the quality of the hot metal.

By applying form 3 of ^ fe, it was possible to maximize the coat diameter at the center of the furnace at 中心 of the central coke in the bellless blast furnace using a chute, and stable awakening was possible. . Further, it was possible to perform the same or higher pressure with a lower fuel ratio as compared with the conventional one, and a better blast furnace departure force was obtained.

Due to difficulties 4 and 5, even if an existing bell-less device is used without a separate coke-only device, the number of raw material patches is not increased, and it is larger than that of peripheral materials. A suitable yoke to the center of the blast furnace. This suggests that, if this effort is applied to an actual blast furnace, the central flow force s of the gas in the furnace can be secured stably, and highly efficient and efficient production of hot metal is possible. ing. Comparative example Invention example Tapping ratio (td / m ³ ) 2.03 2.05 Coke ratio (kgZt) 405 378 Pulverized coal ratio (kg 1) 102 120 Twisting ratio (kg / 1) 507 498 Treated ore ratio (06) 78 78

Claims

1. Materials for Bellless Blast Furnace with Bellless ¾7 ^ The ¾λ method has the following steps:

(a) |? ¾ coke at least one ^! bunker;

(b) |? ¾ ore into at least one bunker :! ¾ ；

(c) Swivel the の ¾bellless¾ while changing its ί angle of difficulty, and move the コ coke in the inward direction of the furnace from the center of the furnace to the wall of the furnace: ;

(d) Rotate the chute of t & IB bellless 置 ^ while changing its «I angle, and move the ore || ¾¾ from the center of the furnace toward the furnace wall in the ^^ direction inside the furnace ^ Λ To do; and

(e) tGi¾ at least one; the amount of coke imprinted by the bunker is between ₅ and 5 Omass% of one patch of coke ^ _Λ , and at least one I9IS ^ S bunker Control to start dispensing ore

2. The raw material of bellless blast furnace with bellless ¾λ¾ method ¾Λ ^ method has the following steps:

(a) Make a mixed raw material that is a mixture of ore and coal into one g bread!

(b) Turning the shunt around the central axis of the blast furnace and gradually changing the ί angle of difficulty of the Λ shunt while moving the mixed raw material, which is difficult for the shu am panker, into the blast furnace;

(c) While the t & iB ^ A chute reciprocates at least once in the blast furnace ^^, the ^ S of the mixed raw material that has been shelled into the tfrtam tanker is controlled to enter the tiiB blast furnace:! ¾

3. The raw material of bellless blast furnace with bellless ^ λ arrangement ¾ ^ method has the following steps: .. (a) For the dimensionless ^ with the furnace center of the bellless blast furnace being 0 and the furnace listening being 1 0.1-

A process of opening the Kotus ^ 立 using the {bellless の chute from the ^ {standing equivalent to 0.4;

(b) With every rotation of | へ | 5 ^ shot, the tilt angle is sequentially shifted into the furnace to させる A the coke: m

4. Kotas sieving process of cutting out the kotas stored in at least two shellfish f¾f and sieving the cut kostas with a sieve provided at the bottom of the tank; The coke on the sieve is weighed with a weighing hopper, and weighed into a bunker provided at 5 m.

Anchoring;

A step of turning the orchid coke into the blast furnace through the shuffle of the base / reless while turning the chute from the furnace center to the furnace wall side;

Raw material of a bell-less blast furnace equipped with a bell-less Λ ^ device, wherein the coke discharged from the sieve having a larger sieve (Α) A first sieving step :: sieving the korts cut through a sieve having ¾ and smaller sieves (Β); comprising a second sieving step;

The difficult process first transports a certain amount of the coats from the first sieve 3¾ to the hopper, and then transports the coke from the second sieve:! Raw material for the bellless blast furnace, which is made into a bunker installed in;

5. The amount of the coatus from the first sieving step of sieving the coatas cut out with a sieve having a larger sieve mesh (A) is 5 to 50 mass ⁰ / o of the coke amount of the patch. Vellless high-grade raw materials as described in range 4.

6. Raw material for bell-less blast furnace with bell-less installation ¾Λ The method has the following steps:

(a) gg coke in at least one bunker;

) Ore at least one S-Punker;

(c) A mixed raw material obtained by mixing ore and coatas in one ^ H bunker

(d) The belly of the café itself is swiveled while changing its vertical angle, and the coke is turned from the center of the furnace toward the wall of the furnace in the direction of the furnace.

(e) turning the chute of the 1915 bellless Λ¾ position while changing its tilt angle, and moving the shelled ore from the center of the furnace toward the furnace in the ^ direction of the furnace; and

(f) At least one; 1 ^ 1 panker is required to discharge between 5 and 50 mass% of the amount of coke per patch per 1512 ^ ヽ m munkers. Controlling the start of the discharge of ore that has caught in the sea;

(g) 工程 turning the chute and ΙΒ¾ gradually changing the tilt angle of the shoot, while mixing the mixed raw material shelled in the ItilSm bunker into the blast furnace; (h) While the ffil ^ A chute reciprocates at least once in the direction of the blast furnace, it is controlled so that ^ * of the leaked raw material mixed in the tanker is 顾 λ into the blast furnace.