JP2008291353A - Operation method of shaft furnace and apparatus used therein for accelerating powdering of coke to be charged into shaft furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation method of a shaft furnace which can be applicable irrespective of the kind of cokes used, sufficiently suppresses powdering of cokes to be charged into the shaft furnace such as a blast furnace and enables smooth, stable operation of the shaft furnace, and an apparatus used therein for accelerating powdering of the cokes to be charged into the shaft furnace. <P>SOLUTION: When separating the cokes into a mass part and a powder part by rotating the cokes in a rotating drum, the separation procedure is conducted while removing at least a portion of the cokes powder part produced in the rotating drum, and the separated cokes mass part is charged into and used in the shaft furnace. For this purpose, the apparatus 1 for accelerating powdering of the cokes to be charged into the shaft furnace is used, wherein the apparatus has a coke-feed opening 3 on one end and a coke-discharge opening 4 on the other end of the rotating drum 2 in the direction of axis of rotation, an intermediate discharge opening 5 which is located between 3 and 4 for removing the cokes powder part from 2 and a sieving device 10 for separating the cokes discharged from 4 into the mass part and the powder part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for operating a vertical furnace, and more particularly to a technique for preventing in-furnace powdering of a vertical furnace charging coke used in a blast furnace or the like.

  In the blast furnace for producing hot metal, iron ore such as sintered ore and lump ore, and massive coke as a heat source and reducing material source are alternately charged from the top of the furnace, and the upper part of the furnace (shaft) Part) are deposited in layers. And the high-temperature air blown into the furnace from the tuyeres at the bottom of the furnace burns the coke accumulated in the furnace to generate high-temperature gas, and the high-temperature gas is between the iron ores and coke particles. The gap flows toward the top of the furnace, and the iron ore and coke are heated, and at the same time, the iron ore is reduced and melted. Therefore, if the gap between the particles is not properly secured, the distribution of the gas flow in the furnace becomes inappropriate for operation, the situation in the furnace becomes worse, and stable and smooth operation cannot be performed. Or, the productivity of the blast furnace decreases. That is, it is very important to ensure the air permeability of the raw material layer for blast furnace operation. When powder is mixed in the raw material charged from the top of the furnace, air permeability is hindered.

  In addition to the powder mixed into the raw material and charged into the furnace, there is also a problem of powder generated in the furnace. Coke exists in a lump until it is combusted by oxygen supplied from the tuyere at the bottom of the furnace after being charged from the top of the furnace, but lacks fragile parts due to physical contact with other raw materials. As a result, coke powder is generated. This powder becomes clogged between the raw material particles and causes deterioration of the stability and controllability of the gas flow in the furnace. For this reason, it is important to suppress pulverization while coke descends in the furnace.

In order to prevent the occurrence of chipping of the fragile portion, many attempts have been made to keep the coke strength high. For example, even if a large amount of non-caking coal that causes a reduction in coke strength is added to the coking coal, as a contrivance that does not decrease the coke strength, non-furnace tar (which occurs during coke production) is reduced. A method is known in which the strength of the obtained coke is prevented from lowering by adding to caking coal and then charging and dry distillation into a coke oven (see, for example, Patent Document 1). There is also a method for producing coke having a high porosity and a certain level of strength by adding a pore-forming agent and a binder during blending of raw coal, and then charging and coking into a coke oven. It is known (for example, refer to Patent Document 2).
JP 2000-8047 A JP-A-11-236573

  The methods described in Patent Document 1 and Patent Document 2 are techniques for improving coke strength by adding an additive to raw coal to improve the average substrate strength of the coke produced.

  However, even when the average substrate strength of coke is improved by blending such an additive, local blending variation (segregation) occurs in the raw material charged into the coke oven. Therefore, in part, coke with a weak substrate is manufactured, and when coke is charged into a blast furnace, the weak coke is pulverized in the furnace.

  Although it is conceivable to use only coal that can produce high-strength coke as the raw material for coke, such coal is expensive, and it is not practical to produce coke using only such varieties of coal. . Even if the strength of the produced coke is low, it is desirable to prevent the coke from being pulverized.

  Therefore, the object of the present invention is to solve such problems of the prior art, and can be applied to any kind of coke, and sufficiently suppresses the pulverization of vertical furnace charging coke such as a blast furnace. An object of the present invention is to provide a vertical furnace operating method and a vertical furnace charging coke pulverization promoting apparatus that enables smooth and stable vertical furnace operation.

The features of the present invention for solving such problems are as follows.
(1) When separating the coke into a lump part and a powdery part by applying a frictional force and a drop impact to the coke in the rotary drum, at least of the coke powdery part generated in the rotary drum A method for operating a vertical furnace, wherein the separation is performed while removing a part from the rotating drum, and the lump of the separated coke is charged into a vertical furnace for use.
(2) The coke is rotated in the rotating drum to separate the coke into a lump part and a powdery part, and at least part of the coke powdery part generated in the rotating drum is removed from the rotating drum. A method for operating a vertical furnace, wherein the separation is performed while removing, and the lump of the separated coke is charged into a vertical furnace for use.
(3) The method for operating a vertical furnace according to (1) or (2), wherein coke having a particle size of 6 mm or more is charged into a vertical furnace as a coke lump.
(4) The method for operating a vertical furnace according to any one of (1) to (3), wherein coke is dried in a rotating drum.
(5) An apparatus for separating coke into a lump part and a powdery part in the rotating drum, the coke supplying port at one end of the rotating drum in the rotation axis direction, and the coke discharging port at the other end, and the coke Between the supply port and the coke discharge port, there is an intermediate discharge port for removing the coke powder from the rotary drum, and the coke discharged from the coke discharge port is separated into a lump and a powder An apparatus for promoting pulverization of coke for vertical furnace charging, characterized by having a sieving device.
(6) The intermediate discharge port is formed by forming a part of the side wall of the rotating drum as a wire mesh that allows the powdered portion of coke to pass through the outside of the rotating drum. The coke pulverization promoting device for vertical furnace charging according to (5).
(7) When separating the coke into a lump part and a powdery part by applying a frictional force and a drop impact to the coke in the rotary drum, at least of the coke powdery part generated in the rotary drum In-furnace coke powder for vertical furnace charging, wherein the separation is performed while part of the coke is removed from the rotary drum, and the separated coke lump is charged into the vertical furnace. Prevention method.
(8) The method for preventing in-furnace pulverization of coke for vertical furnace charging according to (7), wherein coke having a particle diameter of 6 mm or more is charged into a vertical furnace as a coke lump. .
(9) The method for preventing in-furnace pulverization of coke for vertical furnace charging according to (7) or (8), wherein coke is dried in a rotating drum.

  According to the present invention, pulverization of coke charged in a vertical furnace such as a blast furnace in the furnace can be suppressed regardless of the strength of the coke used. This enables smooth and stable furnace operation, and improves the productivity of the furnace. Moreover, the method of the present invention can be efficiently carried out by using the coke pulverization promoting apparatus of the present invention.

  Conventional handling of coke for vertical furnace charging has been made in order to minimize the impact on the coke and prevent coke pulverization. In other words, the handling that prevents the coke from being damaged due to the force applied to the coke during the process of conveying the coke to the vertical furnace has been considered good. However, when the coke has a fragile portion, pulverization occurs in the furnace no matter how small the impact applied to the coke before charging the vertical furnace. Therefore, the present inventors conversely increase the impact applied to the coke before charging the vertical furnace, thereby preliminarily pulverizing the fragile part of the surface of the coke, and removing the powdery part into the vertical furnace. By charging, it is considered that coke pulverization in the furnace can be suppressed, and the coke is rubbed together, and the coke surface is separated into cohesive parts and powdery parts by applying frictional force to the surface of the coke, It has been found that powdering in the furnace can be prevented by using the separated lump in a vertical furnace. And in addition to the frictional force, by applying a drop impact, not only the brittle part of the coke surface, but also promotes the destruction of coke due to the cause of cracks inside the coke, generating a larger amount of powdery parts, It has been found that this can be separated. To this end, it is effective to promote coke powdering using a rotating drum. By rotating the coke in the rotating drum, not only the brittle part of the coke surface but also the destruction of coke due to the cracks existing inside the coke is promoted, generating a larger amount of powdery part. Can be separated.

  By using a rotating drum, friction force can be applied to the surface of the coke inside the rotating drum, and a drop impact can be applied to the coke, but in order to ensure the necessary friction force and drop impact force, it is constant. The total length of the drum is required. The longer this overall length, the higher the construction cost.

  On the other hand, in the rotating drum, immediately after the coke is put into the drum, the coke powder part is sequentially generated due to wear and drop impact, and the amount of the coke powder part accumulation in the downstream of the entire length of the rotary drum gradually increases. For this reason, the impact received by the massive coke falling from upstream on this portion is alleviated by the powdered portion of the accumulated coke, and the drop impact force is reduced. For this reason, in order to ensure the expected drop impact force, the coke needs to be subjected to impact for a long time, and there is a problem that the total length of the equipment must be increased to some extent.

  Therefore, the present inventors, when separating the coke into a lump part and a powdery part by applying a friction force and a drop impact to the coke in the rotary drum, the powdery part of the coke generated in the rotary drum It was found that by separating at least a part of the inside from the rotating drum, accumulation of the powdery portion of the coke can be prevented, and the drop impact force applied to the coke can be maintained above a predetermined level.

  Of the coke separated into a lump part and a powdery part in the rotating drum, it is preferable to use a coke having a particle diameter of 6 mm or more as a coke lump part in a vertical furnace.

  Separation of the massive part and the powdery part is preferably performed using a sieve. The lump portion charged in the furnace preferably has a particle size of about 6 mm or more. The particle size of 6 mm or more in this case means that the sieve mesh is 6 mm or more.

  If the water content of the coke is high, the sieving efficiency is reduced, and there is a case where the lumpy part and the powdery part are not sufficiently separated, so the coke that has been dried is separated into the lumpy part and the powdery part. It is preferable to do. It is efficient to dry the coke together with the application of friction force and drop impact in the rotating drum.

  In addition, it can be considered that the coke yield decreases and the coke cost increases by separating and removing the powdery part, but powdered coke is used in various applications as a high value-added product in steelworks and others. Therefore, the coke as a whole can be used effectively, and the cost increase does not become a problem.

  The vertical furnace used in the present invention is a blast furnace, a shaft furnace, a gasification melting furnace, or the like, and is used by charging massive coke from the top of the furnace.

  Coke is separated into a lump part and a powdery part by applying a frictional force and a drop impact to the coke in the rotating drum, and at least a part of the powdery part of the coke generated in the rotating drum is removed from the rotating drum. In order to perform separation while removing, a coke supply port is provided at one end in the rotation axis direction of the rotating drum, a coke discharge port is provided at the other end, and the coke powder portion is disposed between the coke supply port and the coke discharge port. Coke pulverization promoting apparatus for vertical furnace charging having an intermediate discharge port for removing the coke from the rotary drum and having a sieving device for separating the coke discharged from the coke discharge port into a lump part and a powdery part Can be used. In the rotating drum, the coke powder generated by applying frictional force and drop impact force to the coke is discharged between the coke charging port and the coke discharging port of the rotating drum. By providing an outlet, the coke powder that accumulates on the inner surface of the rotating drum is discharged sequentially before reaching the discharge port at the end of the rotating drum, and the drop impact force between the lump coke and the inner surface of the rotating drum is always kept at the maximum. It is a possible equipment structure. As a result, the processing time by the rotating drum can be shortened, and the same effect can be obtained by using a small rotating drum. The rotating drum preferably has a stirring blade for lifting and dropping the coke inside the drum.

  It is preferable that the intermediate discharge port is formed by forming a part of the side wall of the rotating drum as a wire mesh that allows the powdered portion of the coke to pass through the outside of the rotating drum. The intermediate discharge port can be provided with a wire mesh opening on the entire surface in the circumferential direction, but can also be a series of spaced holes. Further, in order to discharge the powdery portion of coke as needed, it is effective to install intermediate discharge ports at a plurality of locations in the axial direction of the rotating drum.

  One embodiment of the above-described rotating drum type pulverization promoting apparatus of the present invention will be described with reference to the drawings. In FIG. 1, the pulverization promoting apparatus 1 has a coke inlet 3 and a coke outlet 4 on a rotary drum 2, and only the powdery portion of coke can be discharged between the coke inlet 3 and the coke outlet 4. An intermediate outlet 5 is provided. As the intermediate discharge port 5, for example, by installing a wire mesh as a sieve with a predetermined width in the circumferential direction of the rotating drum, the powder coke having a particle size smaller than the sieve can be removed outside the rotating drum. In the present embodiment, coke is supplied into the rotary drum 2 through a supply conveyor 6 from a coke inlet 3 having a screw feeder. Reference numeral 7 denotes a heated gas supply duct for supplying heated gas into the rotary drum 2. Reference numeral 8 denotes a rotary drive device for the rotary drum 2. The coke discharged from the coke discharge port 4 is conveyed to the sieve 10 by the discharge conveyor 9 and sieved, and the coarse particles are supplied to the blast furnace 16 and the like by the vertical furnace conveyor 11. The powdery portion of coke is carried by the powder extraction conveyor 12 together with the powdery portion discharged from the intermediate discharge port 5. The exhaust gas discharged from the coke discharge port 4 is discharged from the exhaust gas chimney 15 through the dust collection bag filter 13 and the dust collection fan 14.

  It is desirable to provide a plurality of intermediate discharge ports 5 in order to discharge the coke powder part as needed.

  Next, an embodiment when the present invention is used in a blast furnace will be described using the coke pulverization promoting apparatus of FIG.

  The red hot coke pushed out from the coke oven is lowered to a discharge place on a belt conveyor called a wharf after sprinkling fire. Then, after cutting out from the wharf, the mass is crushed with a coke cutter (a type of roll crusher), and only the desired size is used in the blast furnace through a sieve under the hopper (storage tank) of the blast furnace. . In recent years, in view of energy saving and environmental measures, there is a case where reddish coke is cooled with gas and called “dry fire extinguishing” and then sent to the blast furnace through the same route.

  First, the present inventors consider that in such conventional coke treatment, the fragile portions of coke are not completely removed, but are charged into a blast furnace, and after applying sufficient frictional force between cokes, sieving is performed. I thought that the weak part could be removed by doing. And as shown in FIG. 1, in the path | route sent to a storage tank from a coke factory or a coke product yard, the rotating drum 2 is further provided, and a weak part is isolate | separated and grind | pulverized, Then, it passes through the sieve 10, After adjusting to a predetermined particle size (for example, 6 to 75 mm), it was decided to send it to a blast furnace storage tank. At that time, a coke sample is collected between the rotating drum 2 and the sieve 10, the strength test of the coke sample is performed, and the strength data is fed back to the rotating drum 2 while adjusting the rotational speed of the rotating drum 2. Then, the coke satisfying the charging standard (for example, in-house standard) regarding the strength and the particle size was made and charged into the blast furnace 16.

  Here, the rotary drum 2 is a cylindrical rotary drum 2, and supplies coke to one end 2 a of the rotary drum 2, rotates it around the cylindrical axis of the rotary drum 2, and rotates the internal coke in the circumferential direction. While moving, impact is applied to the coke by friction and dropping. The rotating drum 2 is disposed so as to be inclined downward by about 5 to 10 degrees from one end 2a for supplying coke to the other end 2b, and the coke moves to the other end 2b while rolling. On the other end side, there is a coke discharge port 4, and the entire amount of the coke discharged from the coke discharge port 9 is sent to a post-process sieve 10 by a discharge conveyor 9. At least a part of the powdery portion of the coke generated while moving in the drum is discharged from the intermediate discharge port 5 to the outside of the rotating drum 2. Thereby, the quantity of the powdery part in the rotating drum 2 reduces, and the fall of the impact given to coke can be relieved.

  What is necessary is just to determine the dimension of the rotating drum 2 suitably according to the quantity of the coke to process. For example, in a normal coke factory, the amount of coke processing is about 150 t / H (tons / hour) to 250 t / H. In this case, the inner diameter of the rotary drum 2 is 3 to 4 m, and its length is 25 to 30 m. The degree is appropriate. The intermediate discharge port can be installed near an intermediate position in the length direction, for example, at an interval of 5 m in the length direction. A plurality of stirring blades are attached to the inner surface of the rotating drum 2 at regular intervals in the circumferential direction so as to promote the destruction of the fragile portion by lifting and dropping coke. For example, a steel plate having a height of 50 mm can be provided along the drum axis at intervals of 180 ° in the circumferential direction, and the coke falls from a position raised to a certain angle by the stirring blade as the cylinder rotates. Repeat the rolling.

  When such rolling is repeated, the fragile portion in the coke structure is almost destroyed and becomes powder, and the portion remaining in a lump is almost free of the fragile portion.

  In the present embodiment, as described above, the coke discharged from the rotating drum 2 is sent to the sieve 10 to have the same particle size as that used in the blast furnace. The strength test is performed by sampling, and this strength test method may be a test method appropriately determined for each blast furnace. As an example, there is a drum strength defined in JIS K 2151 (Chapter 9, “Coke Test Methods”, 9.2: Drum Method). Of course, a tumbler method described in the same standard or the like, which is generally used as a test method for coke strength, may be used.

  When the result of this strength test is higher than the upper limit of the control value of the target strength in the blast furnace supplying coke, the rotational speed of the rotary drum 2 is decreased. Further, when the value is lower than the lower limit of the management value of the target strength, the rotation speed of the rotary drum 2 is increased.

  By adjusting the degree of destruction of the fragile portion of the coke in the rotating drum 2 in this way, the coke strength can be adjusted to a certain value or more without changing the composition of the raw coal during the production of the coke. And stable blast furnace operation is possible. In the present invention, if the coke strength is higher than the upper limit of the target strength even if the rotational speed of the rotary drum 2 is reduced, the blending of coal supplied to the coke oven may be changed to provide a cheaper blend. . In addition, when the rotational speed is positively increased and a strength higher than the target is obtained, the composition can be made inexpensive so that the strength decreases to the target strength.

  As in the present invention, if the fragile portion is removed in advance, the amount of powder coke under the sieve 10 that cannot be used in the blast furnace increases. In general, in steelworks, the powder coke is effective as a fuel for sintering raw materials. Since it can be used, it will not be wasted.

  Next, separation of the coke that has been subjected to the drying process into a lump part and a powdery part will be described.

  The coke powder that is generated when a friction force is applied to the surface of the coke and when the drop impact is applied to the coke is a coke powder that is generated when the coke used contains a large amount of water. When using a sieve for separation, the powdery part cannot be sufficiently separated and removed by this sieve, or the sieve itself is clogged and the coke powdery part cannot be removed. . The powdery part that adheres to the coke lump and cannot be separated and removed by sieving is transported to the top of the vertical furnace while being attached to the coke lump, and is dried by the heat in the furnace. Since the coke lump is separated from the surface of the coke lump, a large amount of powdery coke is charged into the furnace, and the powdery part flows through the gap between the raw materials in the furnace and clogs the gap between the raw materials. When the present invention is used for coke having a high moisture content, there is a concern that it promotes pulverization rather than preventing pulverization in the furnace.

  It is known that a phenomenon in which a powdery part adheres to a coke-like part and separation thereof becomes difficult increases in proportion to the water content of the coke. Therefore, it is preferable to sieve the coke in a dry state, and it is preferable that the amount of water contained in the coke is as small as possible. For that purpose, when applying frictional force or drop impact to the surface of coke, it is arranged at the downstream side to reduce the coke-containing water content by applying constant heat to coke in advance, at the same time or after application. Therefore, it is preferable to dry the coke before sieving.

  The heating method for drying the coke is preferably performed by introducing a heating gas into a rotating drum containing coke, and various heating gases generated in a factory are preferably used. In order to remove moisture contained in coke, it is desirable to use hot-blast furnace combustion exhaust gas and heating furnace exhaust gas with low oxygen concentration. However, a heating gas as a dedicated hot-air generation source by installing a combustion furnace, electric furnace, etc. Can also be generated. In addition, as long as nitrogen for controlling the oxygen concentration is introduced, a heated gas such as a cooler exhaust heat of a sintering machine can be used.

  The temperature of the heated gas is sufficient if the coke can be dried, and 60 ° C. or higher is sufficient for drying the coke, and it is desirable to set it to 200 ° C. or lower. This is because moisture contained in coke, which is a carbonaceous material, is dried, so that it is difficult to prevent fire and explosion if the temperature of the heated gas is too high.

  In FIG. 1, the coke supplied into the rotary drum 2 through the supply conveyor 6 and the screw feeder of the coke supply port 3 is dried by the heated gas sent into the rotary drum 2 from the heated gas supply duct 7. The fragile part is powdered by friction and drop impact after being stirred. The coke discharged from the coke discharge port 4 is conveyed to the sieve 10 by the discharge conveyor 9 and separated into a lump part and a powdery part by sieving. The lump portion on the sieve is transported by the vertical furnace conveyor 11 and charged from the upper side of the vertical furnace 16. The powdery part discharged | emitted from the intermediate | middle discharge port and the powdery part under sieving are conveyed by the powder extraction conveyor 12, and are utilized separately.

Although it was the same as that shown in FIG. 1, a test in which a coke treatment of 190 to 250 t / H was performed and transported to a blast furnace was performed using equipment in which no intermediate discharge port was formed. The rotary drum 2 has an inner diameter of 3.5 m and an effective drum length from the charging end to the discharge end of coke of 27.7 m. Further, a belt conveyor that bypasses the rotating drum 2 was provided, sampling was performed on the upstream side of the sieve 2 at regular intervals, and a test of a comparative example in which only the coke strength was measured was also performed. Strength of the coke was measured at prescribed in JIS K 2151 "drum strength", the particle size of the coke sample when strength measurement 15 mm, as 150rpm rotational speed of the test drum, the so-called "drum intensity (symbol DI ^0.99 ₁₅ ) ”. The sieve mesh of the sieve 10 was 6 mm.

  In the case of the comparative example in which the treatment with the rotating drum 2 is not performed, the coke strength sampled on the upstream side of the sieve 10 is 84.3 on average, but the rotating drum 2 causes the coke to run at a rotation speed of 5 rpm for 20 minutes. In the treated reference example, the drum strength of the coke increased to 85.1. That is, the strength of the coke charged into the blast furnace could be increased by 0.8 points by removing the weak portion of the coke by the treatment with the rotating drum.

  Compared to the normal operation of charging the sieve top of the sieve 2 into the blast furnace without performing the treatment with the rotating drum, the operation test of the present invention in which the sieve top of the sieve 2 is charged into the blast furnace after the treatment with the rotating drum. In this case, coke pulverization in the blast furnace was suppressed, so the air permeability of the blast furnace was improved, the gas flow distribution in the furnace was maintained properly, the furnace condition was stabilized, and smooth operation As a result, the amount of molten iron was improved by 5% under the same operating conditions.

Next, an intermediate discharge port 5 in which a wire mesh having a mesh size of 6 mm was installed in the slit was formed in the central portion of the rotating drum 2 in the axial direction, coke was processed in the same manner as described above, and drum strength was measured. Almost the entire amount of coke powder formed between the coke supply port 3 and the intermediate discharge port 5 in the rotary drum 2 was discharged from the intermediate discharge port 5. Fig. 2 shows the strength of the coke drum after treatment with a rotating drum in a reference example using a facility that does not discharge the coke breeze from the intermediate outlet and the example of the present invention using the facility provided with the intermediate outlet (DI ¹⁵⁰ ₁₅ ). The comparison of the strength value by a test result is shown. In FIG. 2, the rotational speed of the rotating drum and the drum strength of the coke after the rotating drum processing are shown as relative values. In the case of the example of the present invention in which the intermediate discharge from the intermediate discharge port was performed, it was possible to ensure the same drum strength by the rotation process at the rotation speed of 3/4 of the reference example in which the discharge was not performed. From this result, it was found that by providing the intermediate discharge port, it is possible to apply the same impact force to the coke even if the total length of the rotary drum is shortened to 3/4.

  When a frictional force and a drop impact are applied to the surface of the coke by the rotating drum using the same equipment as shown in FIG. 1, a heating gas is introduced into the rotating drum, and a heating gas of 150 ° C. is supplied to the coke. In the case of performing drying with a certain amount of heat applied by (combustion exhaust gas) to reduce the water content of the coke and in the case of not performing drying, the respective treatments were performed and sieved. The separation of the coke and powdery coke after sieving was compared between the case where the moisture content of the coke on the rotating drum outlet side was 2 mass% or less and the case where the moisture content was high without applying heat.

  When the coke with a moisture content of more than 4 mass% without drying is reduced to a moisture content of 0 mass% by drying, the separation situation differs greatly, and when using a sieve with a mesh size of 6 mm, the particle size is 6 mm or less. The mixing ratio of coke (−6 mm) was reduced from the 3 mass% range to about 0.5 mass%. The reduction in the water content of coke greatly affected the separation of the powdery portion of coke, and it was found that the drying treatment is very effective in preventing in-furnace powdering for coke having a high water content.

Schematic which shows one Embodiment of the pulverization acceleration | stimulation apparatus of a vertical furnace charging coke. Graph showing a reference example of the present invention example using the installation comprising an intermediate discharge port, a comparison of the coke drum strength after treatment with a rotary drum (DI ¹⁵⁰ _15).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coke pulverization promotion apparatus for vertical furnace charging 2 Rotary drum 2a, 2b End 3 Coke supply port 4 Coke discharge port 5 Intermediate discharge port 6 Supply conveyor 7 Heating gas supply duct 8 Rotation drive device 9 Discharge conveyor 10 Sieve DESCRIPTION OF SYMBOLS 11 Conveyor for vertical furnaces 12 Powder extraction conveyor 13 Dust collection bag filter 14 Dust collection fan 15 Exhaust gas chimney 16 Vertical furnace (blast furnace)

Claims (6)

  When separating the coke into a lump part and a powdery part by applying a frictional force and a drop impact to the coke in the rotary drum, at least a part of the coke powdery part generated in the rotary drum is removed. A method for operating a vertical furnace, wherein the separation is performed while being removed from the rotary drum, and the lump of the separated coke is used by being charged into a vertical furnace.   By rotating the coke in the rotating drum, the coke is separated into a lump portion and a powdery portion, and at least a part of the coke powder portion generated in the rotating drum is removed from the rotating drum. A method for operating a vertical furnace, wherein the separation is performed, and the lump of the separated coke is charged into a vertical furnace for use.   The method for operating a vertical furnace according to claim 1 or 2, wherein coke having a particle diameter of 6 mm or more is charged and used in a vertical furnace as a coke lump.   The method for operating a vertical furnace according to any one of claims 1 to 3, wherein coke is dried in a rotating drum.   A device for separating coke into a lump part and a powdery part in a rotating drum, having a coke supply port at one end in the rotation axis direction of the rotary drum and a coke discharge port at the other end, and the coke supply port A sieve for separating the coke discharged from the coke outlet into a lump part and a powder part, having an intermediate outlet for removing the coke powder part from the rotary drum between the coke outlet and the coke outlet An apparatus for promoting pulverization of coke for vertical furnace charging, characterized by comprising an apparatus.   The intermediate discharge port is formed by forming a part of the side wall of the rotating drum as a wire mesh that allows the powdered part of the coke to pass through the outside of the rotating drum. 5. An apparatus for promoting pulverization of coke for vertical furnace charging according to 5.

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