JP5504653B2 - Molded coke production facility - Google Patents

Description

  The present invention relates to a facility for producing molded coke in which a molded product of a carbon-containing material is carbonized in a vertical carbonization furnace.

  In order to efficiently operate the blast furnace, coal is carbonized in a coke oven to produce coke, and the operation of charging the coke into the blast furnace is performed. Coke in the blast furnace has a role of a spacer for improving ventilation in the blast furnace, a role as a reducing material, a role as a heat source, and the like.

  In recent years, a continuous molding coke manufacturing method has been developed as a coke manufacturing method that replaces the chamber furnace coke manufacturing method. In the continuous molding coke manufacturing method, a vertical shaft furnace composed of chamotte bricks instead of silica brick is used as a carbonization furnace, and coal is molded into a predetermined size in the cold and then charged into the vertical shaft furnace. Then, the charcoal is dry-distilled by heating using a circulating heat medium gas to produce a molded coke. The formed coke is cooled by the cooling gas blown from the bottom of the vertical shaft furnace while descending the vertical shaft furnace, and discharged outside the furnace (for example, see Non-Patent Document 1). In the case of molded coke, coke with a strength equivalent to that of a normal chamber-type coke oven can be obtained even if a large amount of non-slightly caking coal, which is abundant in resource reserves and inexpensive, is used as a raw material. It has been confirmed that it can be manufactured.

Research report on continuous molding coke manufacturing technology Japan Iron and Steel Association 50 of FIG. 27

  The vertical shaft furnace of the continuous molding coke manufacturing method described in Non-Patent Document 1 is composed of a middle or higher heating / distillation section and a cooling section using a cooling gas of the middle or lower stage, and the discharge section below the vertical shaft furnace is sealed with water. ing. The purpose of water cooling is a countermeasure when the molded coke is not sufficiently cooled in the vertical shaft furnace or a countermeasure for suppressing air inflow into the vertical shaft furnace. If the inflow of air is allowed, the molded coke reacts with air in the vertical shaft furnace, and combustion and quality deterioration occur.

  However, when the formed coke is cooled with water, if the formed coke discharged without being sufficiently cooled in the vertical shaft furnace is rapidly cooled due to a temperature difference with water, there is a risk of cracking and a decrease in strength. Moreover, since the water | moisture content of a molding coke becomes high, there also exists a problem that the carrying-in water | moisture content at the time of charging to a blast furnace increases, and the input energy to a blast furnace increases.

  Therefore, in the present invention, when producing molded coke, the flow of air into the vertical shaft furnace is suppressed without increasing the moisture content of the product, and the molded coke that can cool the product to about room temperature. The purpose is to provide manufacturing equipment.

The features of the present invention for solving such problems are as follows.
(1) A facility for producing carbonized coke by carbonizing a molded product of a carbon-containing substance, which is installed in a vertical distillation furnace for carbonizing the molded product to produce molded coke, and at the bottom of the carbonization furnace And a dry cooling device for cooling the molded coke discharged from the carbonization furnace.
(2) Molded coke according to (1), characterized in that the inside of the dry cooling device is a nitrogen atmosphere, and the connecting portion between the vertical distillation furnace and the dry cooling device is shut off by a double shut-off valve Manufacturing equipment.
(3) The production apparatus for molded coke according to (2), wherein the shut-off valve is a damper type.
(4) The equipment for producing molded coke according to (2), wherein the shut-off valve is a slide type having a slide portion, and the slide portion includes a nitrogen purge nozzle.

  According to the present invention, it is possible to suppress the air inflow into the vertical shaft furnace without increasing the moisture content of the molded coke, and to sufficiently cool the molded coke, and to produce a molded coke that maintains product strength. can do.

The figure which shows one Embodiment of this invention. Schematic of a dry cooling device. The graph which shows the relationship between submergence time and a reduction rate supposing the case where molded coke is discharged by water cooling.

  A water-sealing method is conceivable as a method for suppressing the inflow of outside air (air) into the inside of a dry distillation furnace when a carbon-containing substance such as coal is formed and carbonized obtained by dry distillation. However, depending on the temperature difference between the molded coke, which is the object to be cooled, and water, the molded coke is rapidly cooled, causing cracks and reducing the strength. Therefore, it is necessary to use a method other than water sealing. In the present invention, as a method that can discharge the product without increasing the product strength and the moisture of the product, the dry discharge method is used, and when the molded coke is produced using the vertical carbonization furnace, The present inventors have found that the molded dry product can be cooled by providing a dry cooling device at the bottom of the vertical dry distillation furnace. As a result of further investigation, it was found that the inside of the dry-type cooling device is a nitrogen atmosphere, and it is preferable that the connection portion between the vertical distillation furnace and the dry-type cooling device is shut off by a double shut-off valve.

  The double shut-off valve is preferably a damper type or a slide type. When the shut-off valve is a slide type having a slide portion, it is preferable that the slide portion is provided with a nitrogen purge nozzle. By removing the molded coke remaining on the slide portion by the nitrogen purge nozzle, it is possible to prevent the shut-off valve from being broken and to smoothly open and close the slide portion.

  The present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of the present invention. A dry cooling device 3 is installed at the lower part of the vertical carbonization furnace main body 2 for carbonizing the formed coke raw material. Details of the dry cooling device 3 will be described later.

  When producing molded coke using the equipment shown in FIG. 1, first, in a molding process, which is a pre-process of dry distillation, a molded product molded under a predetermined condition using a carbon-containing substance such as coal is a molded product. It is fed into the charging device 1 and a predetermined amount of the molded product is charged into the vertical dry distillation furnace main body 2. The molded product is dry-distilled by the heated gas blown from the low temperature gas blowing tuyere 4 and the high temperature gas blowing tuyere 5, and the carbon content in the molded product becomes coke. The exhaust gas from the vertical dry distillation furnace main body 2 is tar removed and cooled by the circulating gas cooling devices 8 and 9 and heated by the low temperature gas heating device 10 and the high temperature gas heating device 11 to be supplied to the dry distillation furnace main body 2 as a circulating gas. It is sent. The molded product (molded coke) subjected to dry distillation is cooled by using a part of the gas that has been tar-removed and cooled by the circulating gas cooling devices 8 and 9 as a cooling medium. Cooling gas is cooled by the cooling gas blown from the tuyere 7 and discharged to the dry cooling device 3. The cooling gas blown from the cooling gas blowing tuyere 7 cools the molding coke while exchanging heat with the dry-molded high-temperature molding (molding coke), and the gas heated by the heat exchanging is extracted from the cooling gas. 6 is extracted and sent to the tuyere 4 where the low temperature gas is blown, and used as the heat of dry distillation of the molded product.

  FIG. 2 shows a schematic view of an embodiment of the dry cooling device. The dry cooling device 3 includes an upper hopper 21, an intermediate hopper 24, and a lower hopper 27, and an upper gate valve 22 and an upper seal valve 23 are interposed between the upper hopper 21 and the intermediate hopper 24, and the intermediate hopper 24 and the lower hopper 27. A lower gate valve 25 and a lower seal valve 26 are provided between the upper and lower parts, and the upper and lower double shutoff valves are configured. A stop valve 28 is installed at the outlet of the lower hopper 27. Further, a nitrogen gas N1 inlet is provided between the upper gate valve 22 and the upper seal valve 23, a nitrogen gas N2 inlet is provided in the intermediate hopper 24, and a nitrogen gas N3 is provided between the lower gate valve 25 and the lower seal valve 26. And a nitrogen gas N4 blowing port are provided in the lower hopper 27, respectively.

  Using such a dry cooling device having a double shutoff valve, the molded coke is discharged from the vertical dry distillation furnace main body as follows. Molded coke X that has been carbonized and cooled in the vertical carbonization furnace main body is fed into the upper hopper 21. Molded coke sent to the upper hopper 21 is sent onto the upper seal valve 23 by opening the upper gate valve 22. Thereafter, the upper gate valve 22 is closed, nitrogen is blown from N1, and the space gas is replaced with nitrogen. After the replacement with nitrogen gas is completed, the upper seal valve 23 is opened, and the molded coke is fed into the intermediate hopper 24. After the molded coke is fed into the intermediate hopper 24, the upper seal valve 23 is closed and nitrogen is blown from N2. The cooled molded coke is fed onto the lower seal valve 26 by opening the lower gate valve 25. Thereafter, the lower gate valve 25 is closed, nitrogen is blown from N3, and the space gas is replaced with nitrogen. After the replacement with nitrogen gas is completed, the lower seal valve 26 is opened and the molded coke is fed into the lower hopper 27. Thereafter, the stop valve 28 is opened and the molded coke Y is discharged. By controlling the opening and closing of the double shutoff valve and the nitrogen gas blowing timing in this way, the molded coke that has undergone dry distillation can be cooled, and the outside air (air) can be discharged without involving the inside of the dry distillation furnace. It becomes.

  The molded coke production facility of the present invention can also be used for dry distillation of a molded product of a carbon-containing material and an iron-containing material.

  In order to clarify the effect of nitrogen cooling using a dry-type cooling device, the molded product of iron-containing material formed by mixing coal and iron ore is carbonized in a shaft furnace, and then the molded product is submerged and dried. The reduction rate of the molded product was measured. The results are shown in FIG. The temperature of the molded product immediately after dry distillation was about 200 ° C., and after the molded product was water-cooled for 5 to 30 minutes, the reduction rate of the molded product dried at 100 ° C. for 1 hour was measured. Some molded products were dried for 24 hours at room temperature after water cooling, and the reduction rate was measured.

  According to FIG. 3, the reduction rate of the molded product immediately before dry distillation (nitrogen-cooled) before water immersion was 98.3%, but when immersed, the reduction rate was reduced to 70-90%. It was clarified that reoxidation of.

DESCRIPTION OF SYMBOLS 1 Molding charge apparatus 2 Vertical type distillation furnace main body 3 Dry-type cooling apparatus 4 Low temperature gas blowing tuyere 5 High temperature gas blowing tuyere 6 Cooling gas extraction tuyere 7 Cooling gas blowing tuyere 8 Circulating gas cooling unit 9 Circulating gas cooling unit DESCRIPTION OF SYMBOLS 10 Low temperature gas heating apparatus 11 High temperature gas heating apparatus 21 Upper hopper 22 Upper gate valve 23 Upper seal valve 24 Middle hopper 25 Lower gate valve 26 Lower seal valve 27 Lower hopper 28 Stop valve N1 Nitrogen gas N2 Nitrogen gas N3 Nitrogen gas N4 Nitrogen gas X Molded coke Y Molded coke

Claims (3)

Equipment for producing carbonized coke by carbonizing molded carbon-containing materials,
A vertical carbonization furnace for producing molded coke by dry distillation of the molded product;
A dry cooling device that is installed in connection with the lower part of the carbonization furnace and cools the molded coke discharged from the carbonization furnace, the dry cooling apparatus having an upper hopper, an intermediate hopper, and a lower hopper , equipped with a,
Wherein said upper hopper and between the intermediate hopper and the intermediate hopper shutoff valve is installed between the lower hopper, molded coke said the intermediate hopper, characterized that you have placed a nitrogen gas blowing inlet Manufacturing equipment. The facility for producing molded coke according to claim 1 , wherein the shut-off valve is a damper type. Shut-off valve is a slide type having a sliding portion, manufacturing facilities molded coke according to claim 1, characterized in that it comprises a nitrogen purge nozzle to the slide portions.

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