JPH07119418B2 - Extraction method and equipment for coke oven charging - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a steam extraction hole for steam leading to the upper space of a carbonization chamber in the middle part of the coal containing the water charged in the carbonization chamber of a chamber-type coke oven. And a device therefor.

Conventional technology In the method of producing coke with a chamber-type coke oven,
The coking coal charged in the carbonization chamber is indirectly heated from the fuel chambers on both sides via the furnace wall and is converted into coke. This carbonization chamber has a taper in consideration of the discharge of coke, and the furnace width on the coke side is set to be 50 to 70 mm wider than the machine side. For this reason, in the combustion chamber consisting of 20 to 30 or more flue rows, the coke side is 50 to 70 mm wider than the machine side, as opposed to the carbonization chamber. Also, the temperature of the combustion chamber is 50 to 100 ° C depending on the taper of the furnace width on the coke side rather than the machine side.
The coke formation in the furnace length direction is made uniform by setting it to a high level.

However, the coal-charging work of charging the coke-furnace carbonization chamber is generally performed by a natural drop from a hopper of a coal-charging vehicle through a coal-charging port on the furnace. For this reason, the area directly below the coal charging port that receives the impact when dropped has a higher charging bulk density than the space between the coal charging port that does not receive the impact when falling and the furnace lid side. This hinders the uniformization of coking in the direction.

Recently, it has been required to achieve stable improvement of coke quality while improving the efficiency of dry distillation of the coke oven and prolonging the life of the oven body, and technological development for this purpose is underway. For example, in order to improve the efficiency of dry distillation, the total moisture content of the charged coal, which is normally 8-10%, is reduced to 5-6%, and the pre-heated dry coal is preheated to 170-250 ° C. Then, a preheated coal charging method for reducing the water content to 2% or less has been put into practical use.

These technologies aim to improve the productivity of coke ovens by shortening the time required for carbonization, increase the bulk density of the charge and improve the coke formation by expanding the width of the softening and melting layer of coal during carbonization, and reduce the amount of heat required for carbonization. be able to. However, on the other hand, there is a problem that enormous capital investment is required to dry or preheat the charged coal.

For this reason, the humidified coal charging method and the preheated coal charging method have not come into widespread use, and the fact is that some coke plants are only adopted.

Further, in the humidified coal charging method and the preheated coal charging method, since the bulk density of charging increases, a large coal expansion pressure is applied to the furnace wall during carbonization, which may damage the furnace wall.

Also, expansion of the furnace width or furnace height has been studied to improve the efficiency of dry distillation, but these are effective when a new coke oven is installed, but they cannot be applied to an existing coke oven, so the existing furnace is not applicable. It does not lead to the improvement of the efficiency of dry distillation.

Furthermore, the method of improving the heat conductivity by making the furnace wall brick thinner,
Although it has been partially put into practical use, this may impair the robustness of the furnace body and cannot always be adopted.

Further, as a life extension measure for the furnace body, a repair technique has been advanced in recent years and has been greatly effective. This is a repair of a damaged furnace body and a post-treatment technique. Further, in order to extend the life of the furnace body, it is conceivable to lower the furnace temperature for operation, but this lowers the productivity and is a method contradictory to the improvement of the carbonization efficiency.

Therefore, it has been a very difficult problem to achieve stable improvement of coke quality while achieving both improvement of dry distillation efficiency and life extension of the furnace body.

The present inventors pay attention to the dehydration behavior in the dry distillation process of the water content of 8 to 11% in the charging coal, and when the carbonization of the charging coal containing the water is carried out, the reason why the carbonization efficiency is lowered is There is a wall-side flow of steam generated in the coal bed at the initial stage of carbonization, and the flow can be changed from the high temperature furnace wall (at least 1000 ° C or higher) to the low temperature carbonization chamber upper space (750 to 850 ° C). For example, it was confirmed that the heat transfer efficiency from the furnace wall to the middle part of the coal can be improved and the expansion pressure to the furnace wall can be suppressed. Then, after leveling the upper surface of the charging coal containing water charged in the carbonization chamber, the opening member is inserted into the coal in the furnace from the charging port on the furnace, and the upper part of the carbonization chamber is pulled out. It was clarified that a bleeding hole communicating with the space can be provided and the flow of steam generated in the initial stage of carbonization can be converted to the upper space direction of the carbonization chamber, and a patent application has already been filed as Japanese Patent Application No. 63-299173.

Various methods are conceivable as a method for providing an extraction hole for extracting steam based on water contained in the charging coal during charging charging into the carbonization chamber of the coke oven,
The simplest method is to insert an opening member into the coal in the furnace from the charging port on the furnace and pull out. However, the work of inserting the opening member into the coal from the coal charging port and opening the extraction hole is a muscular work under a bad environment due to high temperature, dust and gas,
Since it is extremely difficult to always input data, it is required to mechanically open the extraction hole.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has been made based on the above-mentioned demand, and is a bleeding hole for bleeding steam or the like generated based on the water content of charged coal in the initial stage of carbonization from the coal into the upper space of the carbonization chamber. The present invention provides a bleeding hole opening method and apparatus for charging a coke oven, which can be opened during a coke oven charging operation.

Means for Solving the Problems The inventors of the present invention have earnestly studied about mechanically opening an extraction hole communicating with the upper space of the carbonization chamber in the coal of the charging coal charged in the carbonization chamber, and as a result, coke Focusing on the fact that the kiln removal work of the furnace is usually performed at 5 kiln pitches or several kiln pitches,
The problem can be solved by additionally providing a bleed hole opening device including a charging lid cover removing device, an opening member, and a vertical drive mechanism for the opening member. In addition, the upper end of the bleed hole opening device is restricted by the lower surface of the coal tower when the coal car is running, so it must be located below the upper end of the coal feeding hopper. Since the bleeding hole opening device is installed at the end portion in the furnace group direction and the vertical drive mechanism can be installed near the coal charging port, it is possible to open the bleeding hole with one opening member. Furthermore, since the bleed hole opening device is installed at the previous charging kiln position on the coal car that was stopped due to the carbonization work, the bleed hole opening work can be performed during the carbonization work.

Regarding the problems of dust and flames ejected from the coal charging port during the bleeding hole opening work, the high-pressure ammonium water injection continued in the rising pipe to prevent dust generation during carbonization, and carbonization was continued. The inventors arrived at the present invention by inventing that the problem can be solved by maintaining a negative pressure in the room.

That is, the present invention relates to a method for opening a bleed hole communicating with an upper space of a carbonization chamber in a charging coal layer from an upper surface of a charging coal containing water charged in a carbonization chamber of a chamber furnace type coke oven. The charging lid lid removing device, the opening member and the vertical driving means of the member are installed at the previous charging furnace position of the coal charging car stopped at the position, and the charging lid of the previous charging furnace is removed during the carbonization work, The opening member is inserted into the charging coal layer through the vertical driving means and is raised, and then the charging lid is mounted.

Also, in the device that opens the bleed hole that communicates with the upper space of the carbonization chamber in the coal bed from the upper surface of the coal containing water charged in the carbonization chamber of the furnace chamber type coke oven, stop at the carbonization position. In the previous coal-charging kiln position of the coal-charging vehicle, the charging lid lid removing device corresponding to each coal-charging port, the opening member, and the vertical driving means for the opening member are installed.

Action In the present invention, the charging lid cover removing device, the opening member and the vertical driving means for the member are installed at the previous charging position of the coal-charging vehicle stopped at the coal-charging position. By removing the charging lid of the charred carbonization chamber with the lid removing device, and inserting the opening member into the charging charcoal through the vertical drive means and raising it, steam extraction holes are opened during charging charcoal. It

Therefore, extra work time is required for opening the bleed holes, and the coke oven kiln removal work is not delayed.

Example 1 An extraction hole opening method and an opening device of the present invention,
A detailed description will be given based on FIGS. 1 to 3 showing an example of the embodiment.

On a rail (2) laid on the furnace of the coke oven (1), a coal car (3) is movably placed. The coal car (3) is provided with a plurality of coal feed hoppers (5) for charging the charged coal into the carbonization chamber (4).

Further, a lid removing device (19) for the charging lid (6) and a bleed hole opening device (20) are attached to the position of the previous charging / charging chamber of the coal charging vehicle (3) in the furnace group direction. This bleed hole opening device (20)
Includes a guide pipe (21), a guide roller (22), an aperture member (25) having a rack (24) supported by a lower guide pipe (23), a vertical drive motor (26), and an upper position sensor (27). ), Lower position sensor (28), scarfing nozzle (29) and pedestal (30) for aperture member (25)
It consists of

The hole member (25) is positioned by the guide pipe (21), the guide roller (22) and the lower guide pipe (23), and the predetermined position by the upper position sensor (27) and the lower position sensor (28). Bleed holes for (31)
The vertical stroke is determined to form Also.
As shown in FIG. 3, the vertical drive motor (26) has a rack (24) provided in the longitudinal direction of the side of the aperture member (25).
The gear (32) is provided so as to mesh with the opening member (2).
The driving speed of 5) is, for example, 1 m / sec. Further, the rack (24) has the extraction hole (31) opened, and then while moving to the upper portion, cleaning and cooling of the adhering charging coal are simultaneously performed by the compressed air injected from the scarfing nozzle (29). To be configured.

Since it is configured as described above, the coal car (3) loads the coal on the coal feeding hopper (5) in a coal tower (not shown), travels to the carburizing position of the predetermined carbonization chamber (4a), and then stops. The charging lid (6) is removed by a lid removing device (not shown). Then, after dropping the charging hood (9) onto the charging port (11),
Open the slide gate (7), and each coal feeding hopper (5)
Cut out the charged coal inside with a table feeder (not shown),
It is loaded into the carbonization chamber (4a) through the auxiliary hopper (8) and the moving sleeve (9). After the charging of the charging coal is completed, the leveler (10) performs leveling on the upper surface. In the meantime, that is, at the same time when the charging lid (6) of the carbonization chamber (4a) is removed, the carbonization chamber (4b) previously charged by the lid removing device (19).
Remove the charging lid (6). And the vertical drive motor (2
6) is driven to move the aperture member (25) downward through the gear (32) and the rack (24) and insert it into the charging coal charged in the carbonization chamber (4b). Immediately thereafter, if the vertical drive motor (26) is reversed to move the aperture member (25) to the upper end, a gas extraction hole (31) communicating with the upper space of the carbonization chamber (4b) is formed in the charcoal.

Then, the charging lid (6) of the coal charging port (11) is mounted again by the lid removing device (19). During that time, high-pressure ammonium hydroxide is injected from the high-pressure ammonium hydroxide nozzle (13) installed in the ascending pipe (12) of the carbonization chamber (4b) to maintain negative pressure in the carbonization chamber (4b) for carbonization. Prevent dust and flame from spouting from the mouth (11).

When the charging operation is completed and the charging lid (6) of the charging port is installed, the charging vehicle (3) is moved to the coal tower, and the charging coal is loaded into the coal feeding hopper (5). The same work is performed by moving to a predetermined carbonization chamber (4).

By these series of operations, the extraction holes (31) communicating with the upper space of the carbonization chamber are formed in the carbonization chamber (4) by the number of the charging ports (11). Moreover, since the position where the extraction hole (31) is formed is directly below the coal charging port (11) with the highest bulk density in the carbonization chamber (4), it contributes to uniform coking in the furnace length direction. It is a big place to do.

Example 2 A coke oven having a furnace height of 7125 mm, a furnace length of 16500 mm and a furnace width of 460 mm was charged with coal having a total water content of 9.2% shown in Table 1 under the operating conditions of an average flue temperature of 1210 ° C. and an average dry distillation time of 22 hours. Charging is performed by using the carburizing car (3) described in Example 1, and during the carburizing work, the capping device (19) is used to remove the charging cap (6) of the previous charging and carbonizing chamber (4b). 50mm in diameter from the top of the central part in the furnace width direction of the charging coal from each coal charging port (11) toward the middle part of the coal
The hole opening member (25) was inserted to a hole depth of 2 m, and the hole opening member (25) was immediately raised to provide an extraction hole (31) communicating with the upper space of the carbonization chamber.

In the meantime, high-pressure ammonium hydroxide nozzle (13) installed in the ascending pipe (12) of the carbonization chamber (4b) injects high-pressure ammonium hydroxide to maintain the inside of the carbonization chamber (4b) at a negative pressure for carbonization. Prevented dust and flame from spouting from the mouth (11).

Using the coal car (3) thus equipped with the bleed hole opening device (20), the bleed hole (31) communicating with the upper space of the carbonization chamber during the charging of the carbonization chamber (4b). The result of coke oven operation with the provision of
Shown in the table.

As shown in Table 2, in the case of the method of the present invention, since the bleeding hole opening work of the previous charging / charging chamber is performed during the charging operation, the opening work time in the total charging work is 0 seconds. Yes, it has no effect on coal charging work.

In addition, since the high-pressure low-pressure water was continuously injected during the opening of the bleed hole to maintain the negative pressure in the carbonization chamber, there was no large amount of dust generation, which was slightly increased compared to the conventional method, but it has no effect on the operation. It wasn't something.

As described above, the method of the present invention is an effective method for opening the extraction holes without causing any problems that hinder the carbonization work by the extraction hole opening work.

Further, the influence on the operation of the coke oven, in the case of the method of the present invention,
The time required to reach 900 ° C was shortened by 1.2 hours, confirming that the effect of promoting carbonization is great. As a result, the carbonization temperature of the coke rises, the drum strength rises, and its variation is reduced, which is effective in stabilizing the coke quality in a stable manner. Furthermore, the extrusion current value during coke extrusion was also reduced by 30 amps, so the coal expansion pressure during carbonization was reduced, and it is estimated that the skin of the coke cake was sufficiently separated from the oven wall. It is also effective in terms of conservation.

EFFECTS OF THE INVENTION According to the method of the present invention, it is effective for promoting coke formation, stable improvement of coke quality, and maintenance of the furnace body during dry distillation of the charged coal containing water in the coke oven chamber furnace. Moreover, the bleeding holes communicating with the upper space of the carbonization chamber can be opened in the charcoal charged without causing any hindrance to the carbonization work.

[Brief description of drawings]

FIG. 1 is a partial schematic cross-sectional view of a coal car and a coke oven provided with a bleeding hole opening device of the present invention in the furnace group direction, and FIG. 2 is a partial schematic cross-section of the same car car and coke oven in the furnace length direction. FIG. 3 and FIG. 3 are enlarged views showing the driving means for moving the aperture member up and down. 1 ... Coke oven, 2 ... Rail, 3 ... Charging car, 4 ...
… Carburizing chamber, 5 …… Coating hopper, 6 …… Charging lid, 10 ……
Leveler, 11 …… Coaling port, 12 …… Rise pipe, 13 …… High pressure water spray nozzle, 19 …… Lid removing device, 20 …… Bleed hole opening device, 21, 23 …… Guide pipe, 22… …guide roller,
24 …… Rack, 25 …… Opening member, 26 …… Vertical drive motor, 27 …… Upper sensor, 28 …… Lower sensor, 29 ……
Scarfing nozzle, 30 …… Stand, 31 …… Bleed hole, 32
……gear,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takafumi Saji, No.3, Hikari, Oshima, Kashima-machi, Kashima-gun, Ibaraki Prefecture, Sumitomo Metal Industries, Ltd., Kashima Steel Works (72) Mikio Watanabe, Otsuko, Oshima, Kashima-machi, Kashima-gun, Ibaraki Prefecture Address Sumitomo Kinzoku Kogyo Co., Ltd. Kashima Steel Works (56) Reference JP-A-1-198686 (JP, A) JP-A-3-192191 (JP, A)

Claims (2)

[Claims] Claim: What is claimed is: 1. A method of opening a bleed hole communicating with an upper space of a carbonization chamber in a charging coal layer from an upper surface of a coal containing water charged in a carbonization chamber of a chamber coke oven. In the previous coal-charging kiln position of the coal-charging car that stopped at the position, the charging lid lid removing device,
An opening member and a vertical driving means for the member were installed, the charging lid of the previous charging kiln was removed during the coal charging operation, and the opening member was inserted into the charging coal layer through the vertical driving means and moved up. Later,
A bleed hole opening method for charging coal in a coke oven, which is equipped with a charging lid. 2. An apparatus for opening a bleed hole communicating with an upper space of a carbonization chamber in a charging coal layer from an upper surface of a coal containing water charged in a carbonization chamber of a chamber furnace type coke oven. A coke oven characterized in that, at the previous coal-charging kiln position of the coal-charging vehicle stopped at the position, a charging-lid lid removing device corresponding to each coal-charging port, an opening member, and vertical driving means for the opening member are installed. Bleed hole opening device for charging coal.