JPS6314033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for removing carbon deposited on the wall of a coke oven carbonization chamber.

(Prior Art) In a coke oven carbonization chamber, carbon produced by thermal decomposition of carbonized gas and pulverized coal scattered during coal charging stick to the oven wall and turn into coke, resulting in deposited carbon. This carbon adhering to the furnace wall works to tightly close the joints of the furnace bricks and prevent gas leaks from the furnace wall. but,
On the one hand, as it grows on the furnace wall, it lowers the thermal conductivity of the furnace wall and reduces the effective volume of the coking chamber, which reduces the productivity of the furnace and furthermore makes coke extrusion impossible. , which causes so-called kiln clogging, so periodic removal work is necessary.

As a method for removing carbon deposited on the furnace wall, the method described below is well known.

Using a spear-shaped jig with a sharp tip and a length of 4 to 5 meters, it is pushed down manually.

As seen in Japanese Utility Model Application No. 56-129563, the carbon is scraped off by moving the ram while pressing a slidable blade attached to the ram head of a coke extruder against the furnace wall.

A method of incinerating and removing the carbon by blowing high-pressure air or high-pressure oxygen onto the furnace wall, for example, for a gas riser pipe, is described in Japanese Patent Application No. 57-3619, etc. Something like that.

One or both of the furnace walls for coke extrusion and the gas riser pipe are opened, and air is introduced into the carbonization chamber from the furnace lid by natural draft. Alternatively, as seen in Japanese Patent Application No. 56-167921, air is introduced into the carbonization chamber from the coal charging port by injecting ammonium water into the curved pipe near the gas riser pipe. This incinerates and removes the carbon.

However, although the above-mentioned method has some effects, it has the following drawbacks.

First, with the mechanical removal methods such as and, the carbon layer completely peels off from the furnace wall, which impairs the sealing function of the carbon joints. This method requires 3 to 4 workers to carry out the process for more than 15 minutes, which is extremely undesirable as they are forced to do hard labor under adverse conditions such as high heat and dust. Furthermore, the method has not yet been put into practical use because of the high risk of damaging the furnace wall bricks.

This method is effective for localized carbon removal, but in order to remove carbon over the entire furnace wall of the carbonization chamber, it is necessary to place spray piping on the entire furnace wall or use a spray nozzle. The entire furnace wall must be scanned. In the former case,
The equipment becomes extremely large, making it impractical in terms of both equipment cost and operability. Moreover, the latter requires a long time to remove, resulting in a decrease in productivity.

In a further method, the furnace wall near the air introduction part is
Even after the carbon is initially removed by incineration, cold air continues to pass through the area, resulting in localized excessive cooling, which can cause damage to the furnace bricks due to spalling, opening of joints, and other negative effects. The amount of oxygen used for combustion is only a fraction of the amount that enters the carbonization chamber, and most of the air is discharged outside the furnace without taking part in combustion, which greatly increases the amount of carbon burned. Can not do it. As a result, the carbon removal operation takes a long time, leading to a decrease in productivity, and the entire furnace is also cooled, which is not desirable in terms of protecting the furnace body, and fuel consumption also increases. As explained above, no matter which method is used, it has the disadvantage that it cannot be said to be a sufficient method for removing adhered carbon.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned situation. Moreover, the attached carbon, which is necessary for sealing brick joints, is left behind and removed by incineration.

(Means for Solving the Problems) The present invention solves the above-mentioned problems, and its gist is that the top surface or a part of the side surface of the coke oven carbonization chamber is opened to the outside air, and other parts are opened to the outside air. The purpose is to cover the opening and inject and swirl high-speed air, oxygen, or a mixture thereof into the carbonization chamber parallel to the wall surface of the carbonization chamber.

Hereinafter, the method for removing adhered carbon according to the present invention will be described based on an example embodiment shown in the drawings.

FIG. 1 shows a schematic longitudinal cross-sectional view of an embodiment of an apparatus for removing carbon deposited on the wall of a carbonization chamber for carrying out the method of the present invention. In the figure, a coke oven carbonization chamber 1 has openings such as furnace lids 2 and 3 on the upper surface, coal charging ports 4 and 4', and a gas riser pipe 5. For example, the gas riser pipe 5 is opened to the outside air, and Openings other than
The coal charging ports 4' other than the coal charging port 4 used for inserting the furnace lids 2 and 3 and the gas header 6 are covered by lids.
Further, the coal charging port 4 used for inserting the gas header 6 is shielded by a collar-shaped flange 8 attached to the gas header 6. The part that is open to the outside air is not limited to the gas riser pipe 5, but also a part of the coal charging inlet 4 and 4', or
It may be part of the gas riser pipe 5, the coal charging ports 4 and 4', or the upper surface of the side, but the total opening area depends on the size of the carbonization chamber, but is usually preferably within the range of 0.1 to 0.25 ^m2 . . If it is less than 0.1 m ² , the combustion gas pressure in the carbonization chamber 1 will become excessive, and the leakage of combustion gas from the shielding part such as ^the lid will become significant.
In this case, the gas in the carbonization chamber 1 is not sufficiently swirled, which will be described later, so that uniform combustion is hindered.

The gas header 6 is connected to a pressure feeding device for air, oxygen, or a mixture thereof, such as a blower 9 installed on the charging vehicle 11, outside the furnace, for example, via a flexible tube 10, It is inserted into the carbonization chamber 1 through the coal charging port 4. The injection nozzle 7 is installed on the gas header 6 so as to be able to inject air, oxygen, or a mixture thereof in a direction parallel to the furnace wall of the carbonization chamber 1 at a predetermined flow rate. The injection nozzles 7 are arranged evenly on the gas header 6 and from the upper end of the furnace of the carbonization chamber 1 to a point below 1/2 of the furnace height. This is preferable for turning over a wide range.

Hereinafter, a case will be described in which carbon adhering to the wall of the carbonization chamber is removed using the above-mentioned apparatus.

Combustion air, oxygen, or a mixture thereof is injected at high speed into the carbonization chamber 1 from an injection nozzle 7 in a direction parallel to the furnace wall of the carbonization chamber via a gas header 6 by a blower 9. be done. This injection speed depends on the size of the carbonization chamber 1, but is usually
A range of 20 to 100 m/s is desirable. If the speed is 20 m/s or less, it is difficult to swirl the gas in the furnace over a wide range, and if the speed is 100 m/s or more, high pressure is required for injection, so the blower capacity becomes larger than necessary and is not practical.

This high-speed air, oxygen, or a mixture thereof supplies new oxygen into the carbonization chamber 1 and has a forced stirring effect on the gas in the carbonization chamber 1 whose openings other than the gas riser pipe 5 are shielded. occurs.
As a result, the gas in the furnace circulates widely within the carbonization chamber 1, promoting the replacement of CO ₂ produced by combustion and oxygen on the surface of the deposited carbon over the entire furnace wall. As a result, the adhered carbon is uniformly incinerated over the entire furnace wall, and among the oxygen introduced into the carbonization chamber 1,
The ratio of carbon used for combustion is dramatically improved, the amount of carbon to be incinerated increases, and the heat of carbon combustion increases to prevent cooling of the furnace.

(Example and Effects) According to the experimental results of the present inventors, the furnace length is 13.4 m,
In a carbonization chamber with a furnace height of 4.0 m and a furnace width of 0.4 m, the air volume is 80 Nm ³ /
As a result of incineration removal for 60 minutes at an injection speed of 50 m/s, carbon combustion was visually confirmed on the entire surface of the furnace wall, and the coke extruder load current increased from the maximum value of 450 A before removal to the maximum value of 230 A after removal. decreased. Furthermore, after the removal, it was confirmed that there was no black smoke coming from the chimney during the initial stage of coal charging, and that the seal at the joint was maintained. On the other hand, the furnace wall temperature was 1035℃ before removal.
It was also revealed that the temperature rose to 1080℃ after removal, and no cooling of the furnace occurred. At this time, the combustion exhaust gas
The average CO ₂ concentration was 15.3%, and the amount of carbon incinerated from this was determined to be 393 kg.

Furthermore, Fig. 2 shows the CO ₂ concentration in the combustion exhaust gas when the injection flow rate was varied with the same equipment arrangement.
The conditions under which the carbonization chamber is not cooled by air incineration and removal vary depending on the furnace wall temperature of the carbonization chamber, but
In a normal coke oven, the oven wall temperature is between 950 and 1150.
℃, and if the CO ₂ concentration in the flue gas exceeds at least 11%, the flue gas temperature will exceed the furnace wall temperature and the furnace will not be cooled. From the results in Figure 2, when the injection speed is 20 m/s or more, the combustion exhaust gas
It can be seen that the furnace is not cooled since the CO ₂ concentration exceeds 11%.

In the above-described apparatus, a case is shown in which there is one gas header 6, but a plurality of gas headers may also be used. Further, the injection nozzle 7 may have a slit-like structure. Furthermore, a coal charging inlet 4 is connected to the injection nozzle 7.
Instead of the gas header 6 inserted from the furnace lid 2.
Or you can set it to 3.

As described above, according to the method for removing carbon adhering to the wall of a coking chamber according to the present invention, carbon adhering to the wall of a coking chamber can be removed uniformly, quickly, and without cooling the coking chamber, and moreover, it can be used to seal brick joints. It can be removed by incineration, leaving behind the necessary attached carbon. Furthermore, since it can be easily carried out using simple equipment, it is an extremely excellent method for removing adhered carbon, which eliminates the need for work in adverse environments with high heat and high dust.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an example of an apparatus for removing carbon deposited on the wall of a coking chamber for carrying out the method according to the present invention, and Fig. 2 is a graph showing experimental results regarding the relationship between injection flow rate and CO ₂ concentration in combustion exhaust gas. be. 1... Carbonization chamber, 2... Furnace cover (coke guide car side), 3... Furnace cover (extruder side), 4... Coal charging port (air header installed), 4'... Coal charging port (others) ), 5...Gas riser pipe, 6...Gas header, 7...Injection nozzle, 8...Gas header flange, 9...Blower, 10...Flexible tube, 11...Charging vehicle, dotted line arrow... ...An example of swirling gas flow.

Claims (1)

[Claims] 1 A part of the top or side surface of the coke oven carbonization chamber is opened to the outside air, and high-speed air, oxygen, or a mixture of these is injected parallel to the wall surface of the coke oven through an injection nozzle provided inside the coke oven carbonization chamber. 1. A method for removing carbon deposited on a coke oven wall in a coke oven carbonization chamber, characterized in that carbon deposited on a coke oven wall is removed by injecting a jet and rotating the carbonization chamber to burn and remove deposited carbon in the carbonization chamber.