JP6028581B2 - Coking coal charging equipment and charging method for coke oven - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an apparatus and method for charging raw coal used in the production of coke into a coke oven, and more particularly to an apparatus and method for charging raw coal mixed with non-slightly caking coal into a coke oven.

  Coke used as a reducing material and a heat source in blast furnace operation is required to have sufficient strength to ensure air permeability in the blast furnace and not to be pulverized even at high temperatures. In order to produce high-strength coke, it is preferable to blend a strong caking coal with a certain ratio or more in the raw coal for producing coke. However, strong caking coal is in a resource-depleted state, and coke is produced using non-caking coal consisting of slightly caking coal that shows a slight caking property or non-caking coal that does not show caking properties. Techniques to do so far have been proposed. Specifically, coke strength is increased by adding a caking filler to the raw coal containing non-slightly caking coal to improve the caking property of the raw coal.

  For example, in Patent Document 1, the cohesiveness index of blended coal (coking coal) after adding a caking agent (liquid caking filler) is determined from the charging density of coal, or the maximum expansion rate or the highest Coke for blast furnace characterized in that it is not less than each lower limit value of fluidity and the cohesiveness index is not more than 100 which is the upper limit value of the total expansion rate and not more than 3.0 which is the upper limit value of the maximum fluidity. A manufacturing method is disclosed. According to Patent Document 1, according to this method, the required strength as blast furnace coke is stably obtained even when coke is produced using coal blended with a large amount of non-slightly caking coal.

  Moreover, in Patent Document 2, a solid caking filler containing 50% or more of fine particles having a particle diameter of less than 3 mm is mixed with raw coal as it is solid, and charged into a coke oven as it is and dry-distilled. A method for producing strength coke is disclosed. According to Patent Document 2, by this method, the solid caking filler is uniformly dispersed in the coal particles, the contact area between the solid caking filler and the coal particles is increased, and a contact that forms a strong coke structure. It is supposed to be an aspect.

JP 2001-262155 A JP 2007-2052 A JP-A-10-245564

  However, since the liquid caking filler is in a liquid state, it may cause operational problems such as clogging of pipes and addition nozzles to which the liquid caking filler is added or adhering in the kneader. Therefore, there is a problem that it is necessary to periodically stop the equipment and perform cleaning, which leads to an operator's work load. In addition, since the solid caking filler softens and melts in high-temperature coal operations at 150 ° C. to 250 ° C., there is a risk of causing adhesion, accumulation, and clogging in a conveyance path such as a conveyance conveyor or a chute. Therefore, in actual operation, it is desirable to add a caking filler to the raw coal at a position as close as possible to the coke oven.

  The present invention has been made in view of such circumstances, and even if the blending ratio of non-slightly caking coal is increased, coke quality can be produced at a low cost without reducing coke quality. An object is to provide a raw coal charging apparatus and a charging method.

  In Patent Document 3, coal is cut out by a table feeder or a rotary feeder from a hopper attached to a coal charging cart (coking vehicle), and charged into a coke oven furnace chamber (carbonization chamber) via a charging cylinder. A method for charging coal into a coke oven, wherein the additive is injected from the spray nozzle provided in the charging cylinder only to the coal charged in the vicinity of the central portion in the coke oven width direction. It is disclosed. However, this invention adds the additive only to the coal located in the center portion of the coke oven furnace width direction, and increases the bulk density of the coal located in the center portion of the coke oven furnace width direction, thereby increasing the coke oven width direction. However, it does not provide a technology that can produce coke at a low cost because the blending ratio of non-slightly caking coal is high.

In order to achieve the above object, according to a first aspect of the present invention, a screw feeder is disposed immediately below a hopper mounted on a coal-carrying vehicle that runs on the top of a coke oven, and raw coal in the hopper is cut out by the screw feeder. In the apparatus charged into the coking chamber of the coke oven,
A caking filler tank that is mounted on the coal loading vehicle and stores caking filler material, and a caulking filler material that is installed in the lower part of the hopper and supplied from the caking filler tank is sprayed downward. It is characterized by providing the nozzle to do.

In addition, the second invention is a method of charging raw coking coal blended with non-slightly caking coal into the coke oven using the raw coal charging apparatus to the coke oven according to the first invention,
The caking filler supplied from the caking filler tank is sprayed from the nozzle toward the raw coal conveyed in the screw feeder.

  In coking coal pretreatment equipment, if caking filler is excessively added to the coking coal, the coking coal may adhere to and accumulate on the transfer route such as the transfer conveyor and connecting part installed up to the coke oven, causing clogging. . In the present invention, since the coking coal is added to the raw coal in the screw feeder that cuts out the raw coal in the hopper mounted on the charcoal car and inserts it into the carbonization chamber of the coke oven, the above problem may occur. It is not affected by the raw coal temperature at the time of charging or the type of caking filler used. In addition, since the raw coal and the caking filler are kneaded in the screw feeder, the caking filler is uniformly mixed with the raw charcoal, and degassing in the raw coal is also promoted. Even if the blending ratio is increased, the coke quality does not deteriorate.

  Moreover, in the raw coal charging apparatus to the coke oven according to the first invention, it is preferable that the nozzle is disposed on the upstream side of the screw feeder.

  The present inventors have discovered that when the raw coal in the hopper is cut out with a screw feeder, segregation of the raw coal occurs inside the hopper. Specifically, the height of the raw coal in the hopper becomes lower toward the upstream side of the screw feeder (see FIG. 2). Therefore, if the nozzle installed in the lower part in a hopper is arrange | positioned in the upstream of a screw feeder, it will become easy to accompany a caking filler with the flow of coking coal, and the coking coal load concerning a nozzle can be reduced.

  Moreover, in the raw coal charging method to the coke oven according to the second invention, it is preferable that the amount of the caking filler added to the raw coal is 1.0% by mass or more and 3% by mass or less.

  When the amount of caking filler added to the raw coal is less than 1.0% by mass, the required coke strength cannot be obtained, while when the amount of caking filler added to the raw coal exceeds 3% by mass, caking is caused. Not only do the lumps of coking coal adhering around the droplets of the filler material, but also the deposits on the screw feeder increase.

  In the apparatus and method for charging raw coal to the coke oven according to the present invention, the caking coal in the hopper is cut out and added to the raw coal in the screw feeder charged in the carbonization chamber of the coke oven. Since the coking coal and the caking filler are kneaded in the screw feeder, the caking filler is uniformly mixed with the raw coal and the degassing in the coking coal is promoted. Even if the blending ratio is increased, coke can be produced at low cost without deteriorating coke quality.

It is the schematic diagram which showed the raw coal charging method into the carbonization chamber by the charcoal vehicle equipped with the raw coal charging apparatus to the coke oven which concerns on one embodiment of this invention. It is a schematic diagram of the raw coal charging part which comprises the raw coal charging apparatus. It is an enlarged view of the A section of FIG.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

The coke oven has a structure in which a coking chamber for producing coke by dry distillation of coking coal and a combustion chamber for supplying heat to the coking chamber are arranged alternately in the furnace width direction. Coking coal is charged into each carbonization chamber by a charcoal vehicle running in the width direction. A schematic diagram showing a method of charging the raw coal C into the carbonization chamber 10 by the charcoal vehicle 11 is shown in FIG. The figure shows cross sections in the furnace length direction of the carbonization chamber 10 and the coal-coating vehicle 11.
As shown in the figure, at the top of the carbonization chamber 10, a plurality of inlets 10a for charging the raw coal C are provided at predetermined intervals in the furnace length direction (five locations in the present embodiment). It has been.
On the other hand, in the charcoal vehicle 11, a raw coal charging portion 15 for charging the raw coal C into the carbonization chamber 10 from the charging port 10a provided at the top of the carbonizing chamber 10 has the same interval as the charging port 10a. A plurality (5 in this embodiment) are mounted.

  Further, the coal-carrying vehicle 11 is equipped with a caking filler tank 14 for storing caking filler, and the caking filler in the caking filler tank 14 is connected to a pipe 16 disposed in the coal-carring vehicle 11. To the raw coal charging section 15. The caking filler tank 14 is connected to the chemical conversion equipment 19 through a pipe 17, and the caking filler produced in the chemical conversion equipment 19 is caulked by a pump 18 installed in the middle of the pipe 17. It is fed to the material tank 14.

As shown in FIG. 2, the raw coal charging section 15 is disposed immediately below the hopper 12 for storing the raw coal C, and the hopper 12. The raw coal C in the hopper 12 is cut out into the carbonization chamber 10 of the coke oven. And a screw feeder 13 to be charged.
Further, a nozzle 23 for injecting the caking filler M supplied from the caking filler tank 14 through the pipe 16 downward is installed in the lower part of the hopper 12.
In addition, the coking coal charging apparatus to the coke oven according to the embodiment of the present invention includes the raw coal charging portion 15 and the caking filler tank 14 for supplying the caking filler M to the raw coal charging portion 15. And a nozzle 23.

  The screw feeder 13 includes a screw 20 in which spiral blades are formed around the rotation axis, and a rectangular casing 25 that houses the screw 20. On the bottom surface of one end portion of the casing 25, a cutout 21 for discharging the raw coal C cut out by the screw 20 is provided. A chute 26 extending downward is attached to the cutout 21, and the cutout 21 is opened and closed by a damper 22 installed in the chute 26.

The coking coal C in the vicinity of the screw 20 in the screw feeder 13 is subjected to a force directed toward the inside of the casing 25 by the rotation of the screw 20, and the internal pressure of the filler increases with the rotation of the screw 20. However, since there is a space where no filler is present only in the upper portion of the casing 25 except directly under the hopper 12, the internal pressure increased by the rotation of the screw 20 is released in the upper space, and the filler is not discharged as in the initial movement. It will be able to flow. By repeating this action in the screw feeder 13 until the raw coal C is cut out, the raw coal C and the caking filler M are uniformly kneaded, and variation in strength of coke produced is reduced.
Moreover, in the process where the said effect | action is repeated, the air between the raw coal C and the raw coal C and between the raw coal C and the caking filler M is deaerated, and a pseudo granulated material is generated. Work also happens. Generation | occurrence | production of a pseudo granulated material becomes a broad distribution of the charging material in a coke oven, and a bulk density increases by 0.01 ton / ch-0.05 ton / ch.

The nozzle 23 for injecting the caking filler M is preferably arranged on the upstream side of the screw feeder 13, and the vertical distance from the injection hole of the nozzle 23 to the screw feeder 13 is preferably about 15 cm (see FIG. 3). Further, the periphery of the nozzle 23 excluding the injection holes is protected by a shielding plate 24 so that the injection holes of the nozzles 23 are not blocked by the raw coal C.
In order to uniformly inject the caking filler M into the raw coal C in the screw feeder 13, it is desirable that the nozzle 23 be a full cone type in which the spray shape is conical.

  The ratio of the non-slightly caking coal (slightly caking coal and non-caking coal) contained in the raw coal C put into the hopper 12 is about 30% by mass to 90% by mass. The temperature of the raw coal C is between room temperature and approximately 250 ° C.

  On the other hand, the caking filler M added to the raw coal C may be either a liquid caking filler or a solid caking filler. However, the amount of the caking filler M added to the raw coal C is preferably 1.0% by mass or more and 3% by mass or less.

  When charging the raw coal C into the coke oven using the raw coal charging device including the raw coal charging portion 15 and the caking filler tank 14 for supplying the caking filler M to the raw coal charging portion 15. The chute 26 is connected to the charging port 10a of the carbonization chamber 10 and the damper 22 is opened. Then, the screw feeder 13 is driven, and the raw coal C in the hopper 12 is cut out by the screw feeder 13. And the caking filler M supplied from the caking filler tank 14 is injected from the nozzle 23 with respect to the raw coal C conveyed toward the cutting exit 21 in the screw feeder 13. The raw coal C and the caking filler M are kneaded by the screw 20 and then charged into the carbonization chamber 10 through the chute 26 through the chute 26.

  Note that the speed of the screw feeder 13 is not always constant, and low speed operation is performed during initial movement, high speed operation during steady operation, and low speed operation before stopping. Therefore, in the raw coal charging apparatus according to the present embodiment, the addition rate of the caking filler M with respect to the raw coal C is always constant, so that the per unit time calculated from the rotation speed of the screw 20 is constant. Based on the cutting amount of the raw coal C, the injection amount of the caking filler M injected from the nozzle 23 is controlled.

  Further, the amount of the caking filler M stored in the caking filler tank 14 is managed by a level meter (not shown) installed in the caking filler tank 14. Is equal to or less than a predetermined amount, the caking filler M is supplied from the chemical conversion equipment 19 to the caking filler tank 14.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the configuration described in the above-described embodiment, and is within the scope of matters described in the claims. Other possible embodiments and modifications are also included.

10: carbonization chamber, 10a: charging inlet, 11: charcoal car, 12: hopper, 13: screw feeder, 14: caking filler tank, 15: raw coal charging section, 16, 17: piping, 18: pump, 19: Chemical conversion equipment, 20: Screw, 21: Cutout, 22: Damper, 23: Nozzle, 24: Shield plate, 25: Casing, 26: Chute, C: Coking coal, M: Adhesive filler

Claims (4)

In a device in which a screw feeder is disposed immediately below a hopper mounted on a coal-cooking vehicle that runs on the top of the coke oven, and the raw coal in the hopper is cut out by the screw feeder and charged into the coking chamber of the coke oven,
A caking filler tank that is mounted on the coal loading vehicle and stores caking filler material, and a caulking filler material that is installed in the lower part of the hopper and supplied from the caking filler tank is sprayed downward. A coking furnace charging apparatus for a coke oven, comprising:   The apparatus for charging raw coal into the coke oven according to claim 1, wherein the nozzle is arranged on the upstream side of the screw feeder. A method for charging raw coke mixed with non-slightly caking coal into a coke oven using the raw coal charging apparatus for the coke oven according to claim 1 or 2,
A method for charging coking coal into a coke oven, wherein a caking filler supplied from the caking filler tank is sprayed from the nozzle toward the coking coal conveyed in the screw feeder.   4. The coke oven charging method according to claim 3, wherein an amount of the caking filler added to the coking coal is 1.0% by mass or more and 3% by mass or less. Raw material coal charging method.

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