JPH03217487A - Boring of extraction hole of coal charge of coke oven - Google Patents

Abstract

PURPOSE:To bore extraction hole of steam leading into upper space of carboniza tion chamber, to promote coking and to stabilizer coke qualities by penetrating a boring member by empty weight to water-containing coal charge and winding up the boring member. CONSTITUTION:A boring member 22 is freely dropped through auxiliary hoppers 6 at a coal charge feed part of a charging car 3, an inner cylinder 7 of charging coal and the center of a mobile sleeve 8 and penetrated by empty weight into water-containing coal charge layer, the boring member 22 is wound np by a winding means 23 separately set and extraction holes 26 are bored through a carbonization chamber 4 of coke oven.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention provides a steam bleed hole in the middle of the charged coal containing moisture charged into the carbonization chamber of a room furnace type coke oven, which communicates with the upper space of the carbonization chamber. The present invention relates to a method for drilling a hole and an apparatus therefor.

In the conventional method of manufacturing coke using a technical room type coke oven,
The coking coal charged into the coking chamber is indirectly heated through the furnace walls from the combustion chambers on both sides, and is turned into coke. This carbonization chamber is tapered in consideration of coke discharge, and the oven width on the coke side is set to be about 50 to 70 mm wider than on the machine side. For this reason, in a combustion chamber consisting of more than 20 to 30 flue rows, the coke side is 50 to 70 mm wider than the machine side, contrary to the carbonization chamber. In addition, the temperature of the combustion chamber is set to be about 50 to 100° C. higher on the coke side than on the machine side in accordance with the taper of the oven width, to ensure uniform coke formation in the oven length direction.

However, charging coal into a coke oven carbonization chamber is generally carried out by gravity dropping from a hopper of a coal loading car through a charging port on the furnace.

For this reason, the charging bulk density is higher directly below the coal charging port, which is subject to the impact of falling, compared to the area between the coal charging port and the furnace lid side, which is not affected by the impact of falling, and This prevents uniform coking in the direction.

In recent years, there has been a need to achieve stable improvements in coke quality while increasing the carbonization efficiency and extending the life of coke ovens, and technological development is underway to achieve this goal. For example, in order to improve the efficiency of carbonization, the total moisture content of charged coal, which normally contains 8 to 10%, is reduced to 5 to 6% using a humidity control method, and the charged coal is dried and preheated to 170 to 250°C. A preheated coal charging method has been put into practical use that reduces moisture content to 2% or less.

These technologies aim to improve coke oven productivity by shortening the time required for carbonization, improve coking properties by increasing the charging bulk density and expanding the width of the softened molten 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 in that a huge amount of equipment investment is required for drying or preheating the charged coal.

For this reason, the moisture-conditioned coal charging method and the preheated coal charging method have not become widespread in general, and are actually only adopted in some coke factories.

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

In addition, consideration has been given to expanding the oven width or oven height in order to improve carbonization efficiency, but although these are effective when installing a new coke oven, they cannot be applied to existing coke ovens. This does not lead to improved carbonization efficiency.

Furthermore, there is also a method to improve heat transfer by making furnace wall bricks thinner.
Although some of these methods have been put into practical use, they may not necessarily be adopted because they may impair the robustness of the furnace body.

Furthermore, as a measure to prolong the life of the furnace body, repair technology has advanced in recent years and has been highly effective, but this is a post-processing technique that is used to repair damaged furnace bodies. In addition, in order to extend the life of the furnace, it may be possible to operate the furnace at a lower temperature, but this is a method that is contradictory to increasing the efficiency of carbonization because it lowers productivity.

Therefore, it has been an extremely difficult problem to achieve stable improvement in coke quality while simultaneously increasing carbonization efficiency and extending the life of the furnace body.

The present inventors focused on the dehydration behavior of water contained in the charged coal at 8 to 11% during the carbonization process, and found that the cause of the decrease in carbonization efficiency when carbonizing the charged coal containing water is as follows. In the early stage of carbonization, steam generated in the coal seam flows toward the wall, and the flow is directed from the high-temperature furnace wall (at least 1000 nm or more) to the low-temperature upper space of the carbonization chamber (750 to 850℃).
) direction, it was confirmed that the heat transfer efficiency from the furnace wall to the middle of the coal could be improved and the expansion pressure on the furnace wall could be suppressed. Then, the top surface of the charged coal containing moisture charged into the carbonization chamber was
After leveling, a perforated member is inserted into the coal in the furnace through the coal loading port on the furnace, and by pulling it out, a bleed hole communicating with the upper space of the coking chamber can be provided, and the water vapor generated during the early stage of carbonization can be removed. It was discovered that the flow could be changed to the direction of the upper space of the carbonization chamber, and a patent has already been filed as Japanese Patent Application No. 63-299173.

However, various methods can be considered for providing bleed holes in the charged coal charged into the coking chamber of a coke oven to bleed out water vapor based on moisture contained in the charged coal. The simplest method is to insert the perforated member into the coal in the furnace through the coal charging port on the furnace and then pull it out. However, the work of inserting the perforation member into the coal from the coal loading port and drilling the extraction hole is a muscular work in a harsh environment with high temperatures, dust, and gas, and it is extremely difficult to do it manually all the time. Therefore, it is desired to open a bleed hole.

Problems to be Solved by the Invention The present invention has been made based on the above-mentioned needs, and includes a bleed hole for extracting water vapor generated from the moisture content of the charged coal into the upper space of the carbonization chamber from the coal. The present invention provides a method and an apparatus for forming bleed holes for coke oven charging coal, which can be formed without interfering with coke oven coal loading operations.

Means for Solving the Problems After leveling the upper surface of the charged coal charged into the carbonization chamber, in order to mechanically open a bleed hole in the coal that communicates with the upper space of the carbonization chamber, a hole-opening member is used. It is necessary to have a transport mechanism for moving the perforated member to a predetermined kiln, and a positioning and vertical drive mechanism for inserting the perforated member into the center in the width direction of the furnace on the upper surface of the charged coal charged from the coal charging port. This problem can be solved by attaching a bleed hole opening device to the coal loading car, which includes a hole opening member and a winding mechanism for the hole opening member. In addition, the upper end of the bleed hole opening device is restricted by the bottom surface of the coal tower when the coal loading car is traveling to receive the coal.
Although it needs to be located below the upper end of the coal feeding bar, even if the hole opening member is short, it is possible to open the bleed hole using its own weight by allowing it to fall freely. Furthermore, by utilizing a coal loading car, extraction hole drilling work can be carried out in a short time. In addition, regarding the problem of dust and flames ejected from the coal charging port during extraction hole drilling work, we are working on the suction of dust collection hoods to prevent dust generation during coal charging, and the high-pressure They discovered that this problem could be solved by continuing to inject water and maintaining a negative pressure inside the carbonization chamber, and arrived at this invention.

That is, the present invention provides a method for opening a bleed hole in a charged coal bed from the upper surface of the charged coal containing moisture charged into the carbonization chamber of a room furnace type coke oven, which communicates with the upper space of the coking chamber. Freely falling the perforated member through the center of the auxiliary hopper, the coal feed inner cylinder, and the moving sleeve of the charging coal supply section,
A separate hoist was installed after the coal was allowed to penetrate into the charged coal seam due to its own weight. The means is used to wind up the apertured member.

In addition, in a device that opens a bleed hole in the charged coal bed that communicates with the upper space of the coking chamber from the upper surface of the charged coal containing moisture charged into the coking chamber of a room furnace type coke oven, An aperture member that can freely fall through the center of the auxiliary hopper of the charcoal supply section, the inner coal supply cylinder, and the movable sleeve, and a hoisting means connected to the upper end of the aperture member via a connection means are installed.

In this invention, the perforated member is allowed to fall freely through the center of the auxiliary hopper, the coal feeding inner cylinder, and the movable sleeve of the charging coal supply section of the coal loading car, and is caused to penetrate into the charging coal bed by its own weight. Thereafter, by winding up the hole-opening member using a winding means installed separately, steam bleed holes are opened in the charged coal.

Further, a hole member that can freely fall through the center of the auxiliary hopper, the coal feed inner cylinder, and the movable sleeve of the charging coal supply section of the coal loading car, and a hoisting means that is connected to the upper end of the hole member via a connecting means. Since this is installed, after the completion of coal charging, each hole-opening member can be easily freely dropped to the center of each coal charging port, and the extraction hole drilling work can be carried out in a short time.

Examples Example 1 Regarding the extraction hole opening method and hole opening device of the present invention,
A detailed explanation will be given based on FIGS. 1 to 3 showing an example of implementation.

A coal car (3) is movably mounted on rails (2) laid on the top of a coke oven (1).

This coal charging car (3) is provided with a plurality of coal feeding hoppers (5) for charging charging coal into the carbonization chamber (4).

Further, a hole punching device (20) is attached to the upper part of the auxiliary hopper (6) that communicates with each coal feeding hopper (5) of the coal loading car (3). This bleed hole opening device (20) includes a guide vibe (21), a hole opening member (22), a winding mechanism (23),
It consists of a wire lobe (24) and a position sensor (25).

This hole member (22) is positioned on the central axis of the auxiliary hopper (6), the coal feed inner cylinder (7), and the moving sleeve (8) by the guide vibe (21). Also,
As shown in FIGS. 2 and 3, the hoisting mechanism (23) is connected to the upper end of the perforated member (22) via a wire rope (24) via a pulley, and by releasing the clutch of the hoisting mechanism (23), The aperture member (22) forms a bleed hole (26) by its own weight as it falls freely, and the vertical position of the aperture member (22) is adjusted by the position sensor (25).

Also, by connecting the clutch of the winding mechanism (23) and winding up the wire lobe (24), the opening member (2
2) is configured to be housed within the guide vibe (21).

Since the configuration is as described above, the coal loading car (3) loads charging coal into the coal feeding hopper (5) at a coal tower (not shown), travels to a predetermined coal loading position in the carbonization chamber (4), and stops. , After lowering the dust collection hood (11) onto the coal loading port (9),
The charging lid is removed using a lid removal device (not shown). Next, the movable sleeve (8) is lowered to the coal charging port (9), the charged coal in each coal feeding hopper (5) is cut out by a table feeder (not shown), and the auxiliary hopper (6), coal feeding inner cylinder ( 7) into the carbonization chamber (4).

After the charging of coal is completed, the upper surface is leveled by a leveler (10). When the leveling is completed, the clutch of the hoisting mechanism (23) is released to allow the perforated member (22) to fall freely and enter the charged coal charged into the coke oven (1) by its own weight.Then, it is immediately hoisted. Start the mechanism (23), connect the clutch, wind up the wire rope (24), and attach the hole member (22) to the guide vibe (
21), a gas bleed hole (26) communicating with the upper space of the carbonization chamber (4) is formed in the charcoal.

Then, the moving sleeve (8) is raised, and the coal loading car (3) is moved up.
The charging lid of the coal charging port (9) is attached by the lid removing device.

During that time, the dust collection hood (11) remains attached to the coal charging port (9) and continues to suck in the ejected dust, and the high-pressure hood (not shown) installed in the riser pipe (12) of the carbonization chamber (4) is used. High-pressure ammonium water is injected from the water nozzle to maintain negative pressure inside the carbonization chamber (4) to suppress dust and flame from blowing out from the coal charging port (9).

After raising the dust collection hood (11), the coal charging car (3) is moved to the coal tower, the charged coal is loaded into the coal feeding hopper (5), and the coal is moved to the next predetermined carbonization chamber (4). and perform the same task.

Through this series of operations, in each carbonization chamber (4), as many bleed holes (26) as there are coal charging ports (9) are formed in the coal, which communicate with the upper space of the carbonization chamber. Moreover, since the position where the bleed hole (26) is formed is directly under the coal charging port (9), which has the highest bulk density in the carbonization chamber (4), it is also effective for uniform coking in the furnace length direction. Dogs contribute.

Example 2 Furnace height 7125mm, furnace length 16500mm, furnace width 460m
m coke oven, average flue temperature 1210℃
, under the operating conditions of an average carbonization time of 22 hours, the charging car (3
), and the top surface of this charged coal is leveled using a leveler (1
After leveling at step 0), as explained in Example 1, from each of the four charging ports (9), the charged coal is placed in a circular shape with a 45° tip toward the center of the coal from the upper surface of the center in the width direction of the furnace. A perforated member (22 mm in diameter, 2 m in length, and 28 kg in weight)
) is allowed to fall freely and penetrate into the charged coal by its own weight,
After that, the opening member (22) is opened by the winding mechanism (23).
) was rolled up and a bleed hole (26) communicating with the upper space of the carbonization chamber was provided.

Table 1 (Note) Volatile matter and residual matter are on a dry base.During this period, suction from the dust collection hood (11) continues, and the high pressure (not shown) installed in the riser pipe (12) of the carbonization chamber (4) continues. The injection of high-pressure ammonium water from the ammonium water nozzle was continued, and the inside of the carbonization chamber (4) was maintained at negative pressure to suppress the ejection of dust and flame from the coal charging port (9).

Using the coal loading car (3) in which the bleed hole opening device (20) is installed in this way, the bleed hole (26) communicating with the upper space of the carbonization chamber is inserted into the charged coal charged into the carbonization chamber (4). Table 2 shows the operating results of the coke oven when installed with the conventional operating results.

Table 2 As shown in Table 2, in the case of the method of the present invention, the total time for the coal loading operation is only 8 seconds longer than the time required for the extraction hole drilling operation, and this does not have a large effect on the coal loading operation. There wasn't.

In addition, since the suction from the dust collection hood and the injection of high-pressure ammonium water were continued during the extraction hole opening to maintain a negative pressure inside the carbonization chamber, there was no difference in dust generation during coal loading compared to the conventional method. .

As described above, the method of the present invention does not cause any problem of interfering with the coal charging operation due to the extraction hole drilling operation, and is an effective method for opening the extraction holes.

In addition, in the case of the method of the present invention, the influence on coke oven operation is as follows:
The time required to reach 900°C was shortened by 1.2 hours, and it is recognized that the effect of accelerating carbonization is large. As a result, the coke carbonization temperature also increases, which increases the drum strength and reduces its variation, which is effective in stably improving coke quality.

Furthermore, since the extrusion current value during coke extrusion also decreased by 30 amperes, it is presumed that the coal expansion pressure during carbonization decreased and the coke cake was sufficiently separated from the furnace wall. It is also effective in terms of conservation.

Example 3 Height 7210 mm, length 79 installed at the end of coke oven group
Using a large-scale test equipment for an actual furnace measuring 20 mm, width 450 mm, and volume 25.7 m3, the coal was charged with the actual coal loading car described in Example 1, leveled, and then opened with the attached bleed hole drilling device. As a member, a diameter 4 with a 45° conical tip
The weight of 8 mm (a) and 90 mm (b) gold bars were changed and they were allowed to fall freely, and the weight of the gold bars and the penetration depth of the metal bars were measured. The results are shown in FIG.

As shown in Figure 4, in order to drill a bleed hole up to 2m from the top of the charged coal, it is necessary to
At 0 mm, a weight of about 50 kg was required.

Effects of the Invention According to the method of the present invention, when charging coal containing moisture is carbonized in an indoor coke oven, it is effective in promoting coking, stably improving coke quality, and maintaining the furnace body. In addition, a bleed hole communicating with the upper space of the carbonization chamber can be formed in the charged coal without any hindrance to the coal charging operation.

[Brief explanation of drawings]

Fig. 1 is a partial schematic sectional view in the oven length direction of a coal loading car and coke oven equipped with the bleed hole opening device of the present invention, and Fig. 2 shows the state of the same bleed hole opening device when the bleed hole is opened. FIG. 3 is a vertical cross-sectional view showing the state after the bleed hole is opened, and FIG. 4 is a diagram showing the relationship between the weight of the metal rod and the penetration depth of the metal rod in Example 3. 1. Coke oven, 3. Coal loading car, 5. Coal feeding hopper 7. Coal feeding inner cylinder, 9. Coal charging port, 11. Dust collection hood 20... Bleed hole opening device, 22 Open. Hole member, 24. Wire lobe, 26. Bleeding hole, a. Gold rod with a diameter of 48 mm, 2. Rail, 4. Carbonization chamber, 6. Auxiliary hopper, 8. Moving sleeve, 10. Leveler 12.・・Rising tube, 21・Guide vibe, 23・Hoisting mechanism, 25・Position sensor b・Metal rod with a diameter of 90 mm, Fig. 1 Fig. 4 Metal bar heavy bar (1; G) Fig. 2 Dodo

Claims (1)

[Scope of Claims] 1. A method for opening a bleed hole communicating with the upper space of the coking chamber in the charged coal layer from the upper surface of the charged coal containing moisture charged into the coking chamber of a chamber-type coke oven, The perforated member is allowed to fall freely through the center of the auxiliary hopper, the coal feed inner cylinder, and the moving sleeve of the charging coal supply section of the coal loading car, and penetrates into the charging coal layer by its own weight, and then the hoisting means installed separately. A method for forming bleed holes for coal charged in a coke oven, which is characterized by winding up a hole member by a method. 2. In a device that opens a bleed hole in the charged coal layer from the top surface of the charged coal containing moisture charged into the coking chamber of a room furnace type coke oven and communicates with the upper space of the coking chamber, It is characterized by installing a hole member that can freely fall through the center of the auxiliary hopper of the supply section, the coal feeding inner cylinder, and the movable sleeve, and a hoisting means connected to the upper end of the hole member via a connecting means. Bleed hole opening device for coke oven charging coal.