JP3247288B2 - Method for removing carbon adhering to the top space of coke oven carbonization chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of removing carbon adhering to a coking chamber furnace top space during insertion and withdrawal of a coke extrusion ram beam in a room furnace coke oven.

[0002]

2. Description of the Related Art A coke oven furnace is a furnace that carbonizes coal charged in a carbonization chamber at about 1100 ° C. to produce coke, and generates a coke oven gas as a fuel during coal carbonization. The coke oven gas passes through a gas passage in the furnace top space, is collected in an air collection tube via an ascending tube, is sucked by a blower, and is sent to a subsequent process. The coke oven gas contains hydrocarbons, and a part thereof is thermally decomposed in the high-temperature carbonization chamber to deposit carbon and adhere to the carbonization chamber wall. When the carbon adhered to the carbonization chamber wall grows, it becomes a resistance at the time of coke extrusion, which causes a blockage or a blockage. In order to scrape the compacted coke, not only much labor is required but also the life of the furnace is shortened because the wall of the carbonization chamber is cooled.

[0003] In recent years, the low-moisture charcoal charging method, which has been introduced, increases the amount of pulverized coal adhering to the carbonization chamber wall due to the collapse of pseudo-particles, and the amount of carbon lost due to the reaction between adhering carbon and water due to low water content. , The amount of attached carbon tends to increase. Regarding carbon adhering to the carbonization chamber wall between the coke upper surface level and the furnace bottom, growth is suppressed to some extent by friction with coke during coke extrusion.
Since there is no carbon in the furnace top space (space between the coke upper surface level and the furnace top), the growth rate is relatively fast, and it is difficult to control the amount of carbon attached to the furnace top space. I have. If the bricks and joint mortar that make up the coke oven have cracks (cut joints), the generated coke oven gas flows into the combustion chamber next to the carbonization chamber, causing incomplete combustion and causing black from the chimney. May produce smoke. Therefore, it is necessary to deposit carbon uniformly thinly (to the extent that no extrusion resistance occurs) in the carbonization chamber.

Conventionally, removal of carbon adhering to the carbonization chamber wall is performed by, for example, manually pushing down the carbon adhering to the carbonization chamber wall from a coal charging hole at the furnace top with a spear-shaped rod. As disclosed in Japanese Patent Application Laid-Open No. 62-161884, a lance is inserted into a coal charging hole from a movable truck installed on a coke oven furnace, and the supplied carbon removing air is discharged from an open riser pipe. And remove the adhered carbon in the carbonization chamber. As disclosed in JP-A-3-195797, a method of blowing low-pressure oxygen-containing gas onto a carbonization chamber wall through a hollow extruded ram beam to burn and remove attached carbon. As disclosed in JP-A-5-194957, the temperature of the furnace wall is measured when the extrusion ram beam is inserted, and the low-pressure oxygen-containing gas supplied via the extrusion ram beam to the low-temperature portion where the carbon deposition amount is large when the extrusion ram beam is retracted. There is a method of burning and removing carbon.

[0005]

The above-mentioned prior art has the following problems. (A) The method of pushing down with a spear-shaped rod with human power is high heat,
Not only is it a heavy-strength operation in a bad environment such as dust and gas, but also a part where the spear-shaped gold rod does not reach the furnace top space between the charging holes does not allow the adhering carbon to be removed. (B) According to the method disclosed in Japanese Patent Application Laid-Open No. 62-161884, carbon near the injection nozzle is removed early, but carbon far away is difficult to remove, and carbon adhering between the charging holes is difficult to remove. Is difficult to remove. (C) The method disclosed in JP-A-3-195797 is inefficient because carbon is incinerated and removed with a low-pressure oxygen-containing gas, and the amount of carbon removed cannot be said to be sufficient. (D) In the method disclosed in Japanese Patent Application Laid-Open No. 5-194957, when the carbon deposition amount is large, the operation time becomes long because the extruded ram beam is stopped at the portion.

An object of the present invention is to remove carbon adhering to the upper wall of a carbonization chamber efficiently without having the above-mentioned problems (a) to (d) so that the joint break does not occur. It is assumed that.

[0007]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the means is to provide a high-pressure air blowing nozzle on the upper part of a ram beam for extruding red hot coke from a coke oven. During the ram beam insertion and withdrawal, air is blown from the high-pressure air blowing nozzle to the coking chamber furnace top space of the coke oven to remove carbon adhering to the coking chamber furnace top space. The flow velocity of the air blown into the furnace top space is 300 to 4
00 m / sec and the flow rate was 4 to 5 m ³ / min.

[0008]

The present inventors have observed the carbon adhering to the furnace top space and found the following facts. The adhered carbon is hard carbon firmly fixed to the furnace wall on the furnace wall side (lower side), and sponge carbon is attached to the surface (upper side). The adhesion of the sponge carbon to the hard carbon is weak. From this, it was presumed that sponge carbon was blown off by air from the air blowing nozzle, and burning and removal of the hard carbon by air would effectively remove carbon adhering to the furnace top space of the carbonization chamber.

An air blowing nozzle is installed above the ram beam of the coke extruder, and air is blown from the air blowing nozzle to the deposited carbon during the insertion and withdrawal of the extruded ram beam to remove the deposited carbon. Many experiments were conducted on the flow rate and flow rate of the blowing air, and the removal status of the attached carbon. As a result, as shown in FIG. 3, when the flow rate of air blown from the air blowing nozzle to the adhering carbon becomes 300 m / sec or less, the thickness of the sponge carbon remaining on the furnace wall side sharply increases and grows into hard carbon. Turned out to be a factor.

Further, as shown in FIG. 4, when the flow rate of the blowing air is 4 m ³ / min or less, the fixed carbon,
Mainly, the amount of hard carbon to be removed by burning is not sufficient, and the hard carbon in the furnace top space grows, so that the carbon is stuck and stuck due to carbon adhesion. Conversely, when the flow rate of the blowing air is 5 m ³ / min or more, the hard carbon is excessively burned off, the carbon in the joint is also incinerated, and the coke oven gas generated in the carbonization chamber leaks to the combustion chamber, resulting in incomplete combustion. As a result, it was found that black smoke was generated from the chimney, and the concentration thereof became 1 degree or more (set as a management standard or less).

From the above, in order to blow off sponge carbon and remove it, the flow rate of air blown to the adhering carbon is set to 300 m / sec or more, and the density of black smoke from the chimney is maintained at 1 degree or less of the management standard. The air flow rate was set to 4 to 5 m ³ / min in order to burn and remove hard carbon so as not to grow rapidly.

In FIGS. 3 and 4, the thickness of carbon deposited on the furnace wall was measured using a large iron compass from the charging hole at the top of the coke oven. Furthermore, five carbonization chambers with approximately the same thickness of deposited carbon in the furnace head space were selected,
It is a value obtained by measuring the thickness of carbon adhered and the density of black smoke from the chimney at the end of 30 times, after performing 30 consecutive extrusions.

[0013]

1 and 2 show an example of an apparatus for carrying out the present invention. In the figure, 3 is the coke oven 1
Is an extruder for extruding red-hot coke 4 from a carbonization chamber 2 through a coke guide wheel 5 to a fire extinguishing bucket 6. Reference numeral 12 denotes a high-pressure air injection nozzle which is disposed near the ram head 9a of the extruder 3 and has a plurality of openings 12a on the side and top. The high-pressure air injection nozzle 12 rises from a position near the ram head 9a. It is fixed in the height direction by an air supply pipe 10a made of a steel pipe, and furthermore, a pedestal 15 fixed on the upper part of the ram head 9a prevents lateral deflection. The high pressure air to the high pressure air injection nozzle 12
From a compressor 7 mounted on the extruder 3, through a receiver tank 8, through a heat-resistant and flexible high-pressure air supply duct 10 and the air supply pipe 10 a installed on the lower surface of the extrusion ram beam 9 of the extruder 3. Supply.

Numeral 11 is a damper for adjusting the flow rate provided in the air supply duct 10. Since the adhesion state of the carbon changes depending on the movement rate of the coke oven, the high pressure air injection nozzle 12 is provided.
The flow rate and flow rate of air supplied to the sponge carbon,
Adjust according to the degree of removal of hard carbon. Reference numeral 14 denotes a winding drum mounted on the extruder 3 to wind and rewind the air supply duct 10 following the movement of the extrusion ram beam 9.

The results obtained by removing carbon adhering to the carbonization chamber having a height of 6092 mm, a width of 440 mm and a length of 15800 mm from the furnace top space at the time of coke extrusion using the above-mentioned apparatus are described below. When the extrusion ram beam 9 of the extruder 3 starts to move, the compressor 7 (pressure: 5 kg / cm ² ) is started to open a 4 mm diameter opening 12 a at the tip and side of the high-pressure air injection nozzle 12. From, flow velocity 400m / sec, flow rate 4m ³ /
min of air was injected. Then, while the extruded ram beam 9 reciprocates in the carbonization chamber 4 at 0.3 m / sec, it is sprayed onto the furnace top space of the carbonization chamber (spray time 150 sec).
The sponge carbon in the furnace top space of the carbonization chamber 4 was blown off, and a part of the sponge carbon and the hard carbon that could not be blown off was burned off.

As a result, since the thickness of the deposited carbon was visually confirmed to be reduced, it was considered that the deposited carbon in the furnace top space of the coking chamber did not cause extrusion resistance during extrusion, and the target amount of coal to be charged into one coking chamber was increased. As a result, as shown in Table 1, during the three months before and after implementing the present example, the average coal input was 0.35 t-
Dry / carbonization chamber increased.

[0017]

[Table 1]

[0018]

As described above, according to the present invention, the carbon adhering to the coke oven carbonization chamber furnace top space, which becomes the extrusion resistance at the time of coke extrusion, can be quickly, accurately, and discharged from the chimney with a simple apparatus configuration. It can be removed by burning without generating black smoke.

[Brief description of the drawings]

FIG. 1 is a simplified side sectional view showing one embodiment of the present invention.

FIG. 2 is a view showing a mounting state of a high-pressure air injection nozzle of FIG. 1;

FIG. 3 is a diagram showing the relationship between the air blowing velocity and sponge carbon adhesion amount.

FIG. 4 is a diagram showing a relationship between an air blowing flow rate, an amount of carbon attached to a furnace top space, and a concentration of black smoke from a chimney.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coke oven 2 Coking chamber 3 Extruder 4 Red hot coke 5 Coke guide 6 Fire extinguishing bucket 7 Compressor 8 Receiver tank 9 Extrusion ram beam 10 High pressure air supply duct 10a Air supply pipe 11 Pressure adjustment damper 12 High pressure air discharge nozzle 13 Carbonization chamber furnace Top space part 14 Winding drum 15 Stand

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-21187 (JP, A) JP-A-6-322374 (JP, A) JP-B-49-16081 (JP, B1) (58) Field (Int.Cl. ⁷ , DB name) C10B 43/10 C10B 43/04

Claims (1)

(57) [Claims] 1. A high-pressure air blowing nozzle is installed above a ram beam for extruding red-hot coke from a coke oven. In removing the carbon adhering to the coking chamber furnace top space by spraying it on the top space, the flow velocity of the air blown to the coking chamber furnace top space is 300 to 400 m / sec, and the flow rate is 4
Coke oven charcoal characterized by having a pressure of up to 5 m ³ / min.
Method for removing carbon adhering to the furnace top space.