JP4012761B2 - Coke oven carbonization chamber furnace wall adhering carbon removal device operation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a carbon removal method for the purpose of burning and removing carbon adhering to a coke oven carbonization chamber furnace wall by air blowing.
[0002]
Carbon generated by pyrolysis of coke oven gas generated during the dry distillation of coal adheres to the carbonization chamber furnace wall of the chamber type coke oven. This carbon adhering to the furnace wall closes the joints of the furnace wall bricks finely and has an effective function of preventing gas leakage from the carbonization chamber to the combustion chamber. Not only lowers the productivity of the furnace but also leads to clogging of the extruder. Therefore, in order to prevent the above-described adverse effects, it is necessary to periodically remove the attached carbon. As a method for removing the carbon adhering to the furnace wall, JP-A-62-161884 discloses a method in which a lance provided with an ejection nozzle is provided so as to freely advance and retract, and JP-A-6-248272 provides an ejection nozzle. A method is disclosed in which a lance is tilted in a carbonization chamber and gas is blown onto a furnace wall.
[0003]
[Problems to be solved by the invention]
In general, the growth rate of carbon deposited in the carbonization chamber varies depending on the location because it is affected by the furnace temperature and the like. In general, in the method in which air is blown with the position and number of lances fixed, a constant flow pattern is formed in the carbonization chamber, and therefore ventilation is performed by a region where the flow velocity is constantly low (hereinafter referred to as stagnation) or vortices. In a region where there is not, the growth rate of attached carbon is relatively increased. Therefore, it is important to prevent local carbon growth while uniformly removing carbon adhering to the entire carbonization chamber.
[0004]
However, in the method of JP-A-62-161884, the operation method is not clarified. Therefore, if the operation at an arbitrary position is continued, the above-mentioned local carbon growth occurs and leads to clogging. . Further, in the operation of tilting the lance, which is the method disclosed in Japanese Patent Laid-Open No. 6-248272, the position where air can be actually blown is limited, so local growth is inevitable.
[0005]
An object of the present invention is to provide a coke oven carbonization chamber furnace wall adhering carbon removal method capable of preventing local carbon growth while uniformly removing carbon adhering to the entire carbonization chamber.
[0006]
[Means for Solving the Problems]
In order to prevent local carbon adhesion, the present inventor studied to find an operation in which a constant flow pattern was not formed in the carbonization chamber. As a result of the research, the present invention is a carbon removal method for the purpose of burning carbon adhering to the furnace wall in the coke oven carbonization chamber by air blowing, wherein the number of lances, the insertion position, and the blowing flow rate are different. The operation method of the carbon removing apparatus is characterized in that patterns of more than one kind are changed regularly or irregularly.
[0007]
Here, the following combinations of blowing patterns can be employed as the air blowing pattern .
(Blowing pattern A) The carbonization chamber has first to fifth charcoal ports sequentially from the forefront (the furnace exhaust port is the rear and the opposite side is the front; hereinafter the same), and the second to fourth devices The first to third lances for blowing air into the coal spout are sequentially inserted from the front, the air discharge hole of the lance is located near the lower end of the lance, the first lance is blown only in the forward direction, and the second lance is blown The direction is forward and obliquely downward, and the third lance is blown forward, backward, and forward obliquely downward. All these lances are blown at the center height of the coking chamber and blown in air. Blowing pattern characterized by that.
(Blowing pattern B) The carbonization chamber has first to fifth charcoal ports sequentially from the forefront (the furnace exhaust port is the rear and the opposite side is the front; hereinafter the same), and the second and third devices First and second lances for injecting air into the coal spout are sequentially inserted from the front, the air discharge hole of the lance is located near the lower end of the lance, the first lance is blown only in the forward direction, and the blowing position is the coking chamber chamber A blowing pattern in which the second lance is blown in the forward and obliquely downward directions, the blowing position is 1/4 of the height of the carbonization chamber, and blows air.
[0008]
As another air blowing pattern, the number of lances is two, the front lance is blown only in the front direction, the blowing position is just below the top of the coking chamber, and the rear lance is blown in the blowing direction. In addition, the blowing position is about 1/4 of the height of the carbonization chamber in the diagonally downward direction of the front. When air is blown in, there is little vortex generation, the area where CO ₂ stays is suppressed to a minimum, and carbon removal is also efficient. Can do.
If either or both of these patterns are employed and the air blowing pattern is changed regularly or irregularly as described above, carbon can be removed more efficiently.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The above-described present invention is based on the following experimental results of the present inventors. In the former blowing pattern, as shown in FIG. 1A, three lances 1a, 1b, and 1c are inserted into the carbonization chamber 4 through the charring ports 2a, 2b, and 2c. The foremost lance 1a has only the front blowing direction (the position of the air discharge port 3a), the middle lance 1b has the blowing direction forward and obliquely downward, and the rearmost lance 1c blows. The directions are forward, backward, and forward diagonally downward. When the insertion position H of each lance is set to the height of the center of the carbonizing chamber and air is discharged from the discharge holes 3a, 3b, 3c of the lance, an air flow as shown in FIG. The feature of this air flow is that there are few stagnation parts. The fact that there are few stagnation parts means that air is evenly distributed in the furnace and carbon can be removed from the entire furnace.
However, in this blowing pattern, vortices are generated in several places. In this vortex region, the air supplied from the lance is not ventilated, and CO ₂ stays locally, causing the attached carbon to grow.
[0010]
Therefore, the latter blowing pattern shown in FIG. The insertion position r of the lance 1a having the discharge hole 3a only in the front is directly below the top of the carbonization chamber furnace, and the insertion position h of the lance 1b having the discharge hole 3b in the forward and front obliquely downward directions is 1/4 of the height of the carbonization chamber. To the extent. When air is discharged from the discharge hole 3 of the lance, an air flow as shown in FIG. This air flow is characterized by the formation of large vortices throughout the furnace. Since it is one large vortex, the whole furnace is sequentially supplied with new air and then exhausted from the exhaust side in order to be ventilated.
[0011]
Even if such a blowing pattern with little swirl or little stagnation is fixed, there is a certain degree of efficient carbon removal effect, but these FIG. 1 (b) and FIG. 2 (b) have completely different air flows. Therefore, if one or both of these blowing patterns are adopted and the blowing pattern is changed regularly or irregularly, more efficient carbon removal is possible.
[0012]
【Example】
The present invention was implemented in an actual coke oven. First, as shown in FIG. 1A, in the lance structure corresponding to claim 2 of the present invention, the insertion position H of the lance 1 into the carbonization chamber 4 is 2500 mm, and the air flow is 8700 Nm ³ / h. After an increase in the pushing current was recognized, the lance arrangement shown in FIG. 2 (a) corresponding to claim 3 of the present invention was changed. The insertion position r was 200 mm, and the insertion position h was 1000 mm. The air volume was 5800 Nm ³ / h, and as a result of continuing the operation, no clogging was observed.
[0013]
【The invention's effect】
As described above, according to the present invention, the air blowing direction and the blowing position are regulated, or two or more different patterns are changed periodically or irregularly, so that carbon adhesion is effectively performed by blowing air. It is possible to burn and remove.
[Brief description of the drawings]
FIG. 1 (a) is a longitudinal side view of a carbon removing device for carrying out the method of the present invention, and FIG. 1 (b) is a view showing an air flow when this carbon removing device is used.
FIG. 2A is a longitudinal side view of another example of a carbon removing device for carrying out the method of the present invention, and FIG. 2B is a diagram showing an air flow when this carbon removing device is used. is there.
[Explanation of symbols]
1a, 1b, 1c Lance 2a, 2b, 2c Charging port 3a, 3b, 3c Air discharge hole 4 Carbonization chamber

Claims (2)

A carbon removal method for burning carbon adhering to a furnace wall in a coke oven carbonization chamber by blowing air or oxygen-added air (hereinafter referred to as air), the number of lances blowing the air blowing position, keep predetermined blowing flow amount thus determined blowing pattern of two or more, operating method of the coke oven carbonization chamber furnace wall attached decoking apparatus characterized by changing the blowing pattern regularly or irregularly . The operation method of the coke oven carbonization chamber furnace wall adhesion carbon removal apparatus, wherein the injection pattern in claim 1 is a combination of the following injection patterns A and B.
(Blowing pattern A) The carbonization chamber has first to fifth charcoal ports sequentially from the forefront (the furnace exhaust port is the rear and the opposite side is the front; hereinafter the same), and the second to fourth devices The first to third lances for blowing air into the coal spout are sequentially inserted from the front, the air discharge hole of the lance is located near the lower end of the lance, the first lance is blown only in the forward direction, and the second lance is blown The direction is forward and obliquely downward, and the third lance is blown forward, backward, and forward obliquely downward. All these lances are blown at the center height of the coking chamber and blown in air. Blowing pattern characterized by that.
(Blowing pattern B) The carbonization chamber has first to fifth charcoal ports sequentially from the forefront (the furnace exhaust port is the rear and the opposite side is the front; hereinafter the same), and the second and third devices First and second lances for injecting air into the coal spout are sequentially inserted from the front, the air discharge hole of the lance is located near the lower end of the lance, the first lance is blown only in the forward direction, and the blowing position is the coking chamber chamber A blowing pattern in which the second lance is blown in the forward and obliquely downward directions, the blowing position is 1/4 of the height of the carbonization chamber, and blows air.

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