JP5135997B2 - Dust collection method for coke oven kiln - Google Patents

Description

The present invention relates to a dust collection method for a coke oven kiln that collects dust generated when coke is extruded from a coking chamber of a coke oven.

Conventionally, coal is charged into a large number of carbonization chambers juxtaposed in a coke oven, and this coal is subjected to dry distillation with heat from a heat storage chamber to produce coke. Then, the produced coke is removed from the carbonization chamber to the outside by an extruder that removes the furnace lid of the carbonization chamber and moves between the carbonization chambers, and is supplied to the blast furnace.
Thus, when removing the furnace lid from the carbonization chamber, the red hot coke in the carbonization chamber (burning coke) is exposed to the outside over the entire length in the vertical direction of the carbonization chamber at the kiln. A lot of dust was generated. Moreover, when coke was extruded from the carbonization chamber by the extruder, dust was flowing out from the kiln.
For this reason, for example, in Patent Document 1, dust flowing out from the coke oven kiln is collected by a hood attached to an extruder, and attracted to a dust collector installed on the ground, that is, a bag filter, to collect the dust. An apparatus is disclosed.

JP 2004-131604 A

However, the apparatus disclosed in Patent Document 1 has a large water-sealed duct as a connector that connects a hood attached to an extruder that moves between the carbonization chambers and a dust collector installed on the ground. Therefore, the length is long, the structure is complicated, and a space is required around the extruder. For this reason, as the moving distance of the extruder with respect to the dust collector becomes longer, the cost becomes higher and it is not economical.
Further, when a water-sealed duct is used, for example, water level management, water treatment, and discharge treatment of dust accumulated in the duct are necessary, and maintenance is poor.

The present invention has been made in view of such circumstances, and it is not necessary to secure an installation space on the ground, the apparatus configuration is simple, the maintenance is easy, and the coke oven enables dust collection economically. It aims at providing the dust collection method of a kiln.

The gist of the present invention made to solve the above problems is as follows.
(1) A dust collection hood provided in the extruder is used to remove dust generated when coke that has been carbonized in a number of carbonization chambers arranged in parallel in a coke oven is extruded by an extruder that moves between the carbonization chambers. In the dust collection method of the coke oven kiln that collects dust with a dust collector,
The dust collector is an electrostatic precipitator which is provided on the extruder, the dust of the distance between the dust collecting electrode and the discharge electrode of the electric dust collector is in the range of 10mm or 70mm or less, deposited on the collection electrode of the electrostatic precipitator After the dust collection in the carbonization chamber of 10 or less is completed, and while the dust collection by the electric dust collector is stopped and the extruder is moving between the carbonization chambers, A dust collecting method for a coke oven kiln characterized by dropping.

(2) The dust collecting method for a coke oven kiln as set forth in (1), wherein the dust is removed from the dust collecting electrode each time the extruder moves between the carbonization chambers.
(3) While the dust collected by the dust collecting electrode is stopped by the electric dust collector and the extruder is moving between the carbonization chambers, The dust collection method for a coke oven kiln as described in (1) and (2), wherein the dust is discharged into an installed debris disposal box.
(4) The discharge of the dust that has fallen from the dust collection electrode to the debris disposal box is performed after the dust collection in the carbonization chamber located in the vicinity of the debris disposal box is stopped. The dust collecting method for the coke oven kiln described in (3).

The dust collecting method for the coke oven kiln according to the present invention can frequently remove dust adhering to the dust collecting electrode without affecting the extruding operation of the burning coke of the extruder. The dust collector can be made compact by narrowing the distance between the dust electrodes, so this dust collector can be installed in the extruder, eliminating the need for connectors that are long, complex, and poorly maintainable. The effect is that the cost is low.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a front view of a dust collector of the coke oven kiln used in the dust collecting method of the coke oven kiln according to one embodiment of the present invention, and FIG. 2 is a diagram of a dust collecting hood of the dust collector. FIG. 3A is an explanatory view showing the relationship between the spacing between adjacent dust collecting electrodes and the dust collection efficiency, and FIG. 3B is an explanatory diagram showing the relationship between the dust collection efficiency and the size of the electric dust collector, FIG. (A) is explanatory drawing which shows the relationship between dust collection time and the fluctuation | variation of the dust collection efficiency by dust adhesion, (B) is explanatory drawing which examined the utilization method of an electric dust collector.

As shown in FIGS. 1 and 2, a dust collecting method for a coke oven kiln according to an embodiment of the present invention includes a large number (for example, about 50 to 100) of carbonization chambers 11 arranged in parallel to the coke oven 10. This is a method of collecting dust generated when the coke co-distilled in (1) is pushed out by an extruder (12) by an electric dust collector (14) through a dust collecting hood (13) provided in the extruder (12).
First, after explaining a dust collector (hereinafter also simply referred to as a dust collector) 15 for a coke oven kiln used in the dust collecting method for a coke oven kiln according to an embodiment of the present invention, the dust collecting method will be described. explain.

As shown in FIG. 1, a dust collecting device 15 at the coke oven kiln has a dust collecting hood 13 and an electric dust collector 14, and is provided in an extruder 12 provided side by side with the coke oven 10.
The extruder 12 includes a carriage 18 that can run on a pair of rails 16 and 17 that are laid in parallel to a direction orthogonal to the coke extrusion direction on the front side of a large number of coking chambers 11 arranged side by side. It is a conventionally well-known thing which has the extrusion ram 19 which extrudes the coke in the carbonization chamber 11, and was provided so that advance / retreat was possible.
That is, the extruder 12 moves to the front of the carbonization chamber 11 where the dry distillation is completed, then removes the furnace lid of the carbonization chamber 11, inserts the extrusion ram 19 into the carbonization chamber 11, and generates heat in the carbonization chamber 11. It is what extrudes coke.

As shown in FIGS. 1 and 2, the dust collection hood 13 is configured such that the suction port 20 of the dust collection hood 13 is positioned above the kiln port of the carbonization chamber 11 when the extruder 12 performs coke extrusion. In addition, it is installed in the extruder 12. The suction port 20 of the dust collection hood 13 is formed wide so as to cover the kiln port of the carbonization chamber 11.
Thereby, the blower (not shown) arranged in the middle of the duct 23 provided on the downstream side of the electrostatic precipitator 14 is operated for dust generated when the furnace lid is removed from the carbonization chamber 11 and when the coke is pushed out. Thus, suction can be performed through the dust collection hood 13.
Further, a duct 21 is connected to the downstream side of the dust collection hood 13, and an electric dust collector 14 is connected to the downstream end of the duct 21.

The electric dust collector 14 includes a casing 22 in which dust that has passed through the duct 21 flows and is collected, a duct 23 that is provided on the downstream side of the casing 22 and discharges purified air to the outside, and a lower portion of the casing 22. And a dust discharge chute 24 that discharges the dust in the casing 22 to the outside.
The casing 22 has a length in the direction in which the air sucked into the dust collection hood 13 flows, for example, about ³ to 10 m and a volume of about ³⁰ to 150 m ^3, for example, and the dust collection through which air containing dust to be cleaned passes. It has a part. As shown in FIG. 4 (A), the dust collecting portion has a configuration in which a plurality of discharge electrodes are arranged between dust collecting electrodes arranged to face each other at intervals. As a result, a voltage of (+) is applied to the dust collection electrode and a voltage of (-) is applied to the discharge electrode, a load electric field is formed between the dust collection electrode and the discharge electrode, and dust is adsorbed to the dust collection electrode. .

Thus, since dust adheres to the dust collection electrode, the suction force gradually decreases, thereby causing a difference in dust collection efficiency. Therefore, in the present embodiment, the interval between the dust collecting electrode and the discharge electrode is set within a range of 10 mm or more and 70 mm or less, which is narrower than the interval (generally about 150 mm) of a commonly used industrial electric machine dust collector. doing. Hereinafter, this reason will be described.
As shown in FIG. 3A, among the plurality of dust collecting electrodes, the number of dust collecting electrodes that can be arranged in a casing having the same volume increases as the interval between adjacent dust collecting electrodes becomes narrow. For this reason, the dust collecting electrodes are arranged with high density, and the dust easily comes into contact with the dust collecting electrode. As a result, the dust collecting efficiency of the dust can be improved. In FIG. 3A, only the dust collection electrode is shown.
On the other hand, as shown in FIG. 3B, the dust collection efficiency can be further improved by increasing the volume of the casing (lengthening the length), but as the volume of the casing is increased, There is a problem that the size of the dust collector becomes large.

For this reason, as described above, the interval between adjacent dust collecting electrodes may be narrowed, but in this case, as shown in FIG. The dust collection efficiency is lower than when the distance between adjacent dust collection electrodes is wide. This is because as the dust collection time elapses, the thickness of the dust adhering to the dust collection electrode increases, the distance between the dust collection electrode and the discharge electrode becomes narrower, and sparking occurs, resulting in a decrease in charge.
Therefore, as shown in FIG. 4B, in order to maintain good dust collection efficiency, it is necessary to frequently remove dust attached to the dust collection electrode from the dust collection electrode.

The dust collection described above is performed intermittently, and the dust collection time per time is as short as about 10 minutes, and as described above, the extruder moves to the carbonization chamber for the next extrusion operation. During the operation, the dust dusting operation is performed, so that the adhesion growth of the dust adhering to the dust collecting electrode can be reduced. For this reason, by arranging a plurality of dust collecting electrodes at a high density and reducing the distance between the dust collecting electrodes and the discharge electrodes, the electric dust collector 14 can be made compact and the extrusion operation is not affected. .
In addition, as this compact electric dust collector, what is applied to the domestic air cleaner can be used, for example.

Here, the distance between the dust collection electrode and the discharge electrode is preferably set according to the amount of dust generated. For example, when the amount of dust is large, the interval approaches 70 mm within a range of 10 mm or more and 70 mm or less, while when the amount of dust is small, the interval approaches 10 mm within this range.
Moreover, conventionally known methods such as hitting the dust collecting electrode or casing with a hammer or using a device that slides on the surface of the dust collecting electrode can be applied to the dust removal from the dust collecting electrode. In addition, you may remove dust from a dust collection electrode by the vibration at the time of the extruder 12 moving, without using a special apparatus. At this time, energization to the dust collection electrode and the discharge electrode may be stopped.

The dust collection efficiency shown above is further improved with an increase in time for the dust to pass through the casing of the electric dust collector. Therefore, if the suction speed of the air containing the dust by the blower is too fast, the dust collection electrode The dust collection efficiency of the dust is reduced. On the other hand, if it is too late, the dust collection efficiency is high but the volume of the casing needs to be increased.
For this reason, the time for the air containing dust to stay in the casing is, for example, 1 second or more, further 2 seconds or more, 10 seconds or less, and further 5 seconds or less. At this time, the flow velocity in the casing is 2 m / sec or less, more preferably 1 m / sec or less, 0.2 m / sec or more, and further preferably 0.4 m / sec or more.

Next, a dust collecting method for a coke oven kiln according to an embodiment of the present invention will be described using the dust collector 15 for the coke oven kiln shown above.
First, the extruder 12 is moved to the front of the carbonization chamber 11 where the coke is produced, the blower of the electrostatic precipitator 14 is operated, the furnace lid of the carbonization chamber 11 is removed, and the extrusion ram 19 is placed in the carbonization chamber 11. Insert and extrude burning coke.
When removing the furnace lid of the carbonization chamber 11 and when coke is pushed out from the carbonization chamber 11, dust is generated.

Here, as described above, the suction port 20 of the dust collection hood 13 is positioned directly above the front of the kiln mouth of the carbonization chamber 11 and is formed wide so as to cover the kiln mouth of the carbonization chamber 11. For this reason, the air containing the generated dust is sucked into the suction port 20 of the dust collection hood 13, cleaned by the electric dust collector 14, and then released from the duct 23 to the atmosphere.
In this way, after the coke extrusion operation is completed, the extrusion ram 19 is pulled out from the carbonization chamber 11, the furnace lid of the carbonization chamber 11 is closed and the blower is stopped, and the extruder 12 is operated for the next coke extrusion operation. It moves to the front of the carbonization chamber 11 to be performed.
By repeatedly performing this operation, it is possible to suppress and further prevent the emission of dust into the atmosphere.
In addition, although the air containing dust may rise to about 400 degreeC momentarily, since all the electrostatic precipitators 14 are comprised with the metal, since each member is not heated up immediately, there is no problem.

The dust collected by the above method adheres to the dust collection electrode of the electric dust collector 14, but the dust collection efficiency decreases as the amount of dust attached to the dust collection electrode increases. Therefore, the dust adhering to the dust collecting electrode is removed from the dust collecting electrode by the above-described method to prevent the dust collecting efficiency from being lowered.
The dust attached to the dust collecting electrode is removed while the dust collecting by the electric dust collector 14 is stopped and the extruder 12 is moving between the carbonization chambers 11. Here, the dust from the dust collecting electrode may be removed after dust collection in a plurality (for example, 2 to 10) of the carbonization chambers 11 is completed, or each time the dust collection in each carbonization chamber 11 is completed. That is, it can be performed each time the extruder 12 moves between the carbonization chambers 11.

Further, the dust removed from the dust collection electrode is accumulated in the dust discharge chute 24 at the lower part of the casing 22. For this reason, the accumulated dust stops collecting by the electric dust collector 14, and while the extruder 12 is moving between the carbonization chambers 11, the dust of the extruder 12 is passed through the dust discharge chute 24. It is preferable to discharge to a debris disposal box (not shown) installed on the movement path (near the rails 16 and 17). This falling object disposal box is a bucket of an existing extruder 12 and is installed at a ratio of, for example, 5 to 20 carbonization chambers 11.
This makes it possible to collect dust on the ground.

In particular, the discharge of dust into the debris disposal box is caused by the carbonization chamber 11 located in the vicinity of the debris disposal box (e.g., no more than two carbonizations in the moving direction of the extruder 12 around the debris disposal box) It may be performed after the dust collection in the chamber 11) is stopped.
Further, when the extruder 12 is moving between the carbonization chambers 11, for example, there is a pause of about 20 minutes after performing the dust collection work for about 2 hours. Good.
In addition, since the extruder 12 performs the coke extrusion work, movement, and stop sequentially by the control unit, the start and end control of dust removal from the dust collecting electrode is performed based on these signals. It can be performed.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the dust collection method for a coke oven kiln of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
In the above embodiment, the case where the electric dust collector in which the discharge electrode is arranged between the dust collection electrodes arranged in opposition has been described. However, the present invention is not limited to this configuration. It may be a thing.

It is a front view of the dust collector of the coke oven kiln used for the dust collection method of the coke oven kiln concerning one embodiment of the present invention. It is a perspective view of the dust collection hood of the dust collector of the coke oven kiln. (A) is explanatory drawing which shows the relationship between the space | interval of adjacent dust collecting electrodes, and dust collection efficiency, (B) is explanatory drawing which shows the relationship between dust collection efficiency and the magnitude | size of an electric dust collector. (A) is explanatory drawing which shows the relationship between dust collection time and the fluctuation | variation of the dust collection efficiency by dust adhesion, (B) is explanatory drawing which examined the utilization method of an electric dust collector.

Explanation of symbols

10: Coke oven, 11: Carbonization chamber, 12: Extruder, 13: Dust collection hood, 14: Electric dust collector, 15: Dust collector at the coke oven kiln, 16, 17: Rail, 18: Dolly, 19: Extrusion Ram, 20: suction port, 21: duct, 22: casing, 23: duct, 24: dust discharge chute

Claims (4)

Dust collector generated by extruding coke dry-distilled in a large number of carbonization chambers arranged in parallel in a coke oven by an extruder moving between the carbonization chambers via a dust collection hood provided in the extruder In the dust collection method of the coke oven kiln that collects dust at
The dust collector is an electrostatic precipitator which is provided on the extruder, the dust of the distance between the dust collecting electrode and the discharge electrode of the electric dust collector is in the range of 10mm or 70mm or less, deposited on the collection electrode of the electrostatic precipitator After the dust collection in the carbonization chamber of 10 or less is completed, and while the dust collection by the electric dust collector is stopped and the extruder is moving between the carbonization chambers, A dust collecting method for a coke oven kiln characterized by dropping. 2. The dust collecting method for a coke oven kiln according to claim 1, wherein the dust is removed from the dust collecting electrode every time the extruder moves between the carbonization chambers. How to collect dust at the kiln. 3. The dust collecting method for a coke oven kiln according to claim 1 or 2, wherein the dust that has fallen from the dust collecting electrode is stopped by the electric dust collector and the extruder moves between the carbonization chambers. A dust collecting method for a coke oven kiln, wherein the dust is discharged into a debris disposal box installed on a moving path of the extruder during the operation. 4. The dust collecting method for a coke oven kiln according to claim 3, wherein the dust discharged from the dust collecting electrode is discharged into the debris disposal box in the carbonization chamber located in the vicinity of the debris disposal box. A dust collection method for a coke oven kiln, which is performed after the dust collection is stopped.

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