JPH0617055A - Method for preventing tar deposition at sealing section of code oven lid - Google Patents

Abstract

PURPOSE:To prevent the deposition of tar in a gas space between a refractory installed on an oven lid and a wall of a coke oven chamber by sucking a part of a coke oven gas produced during coal carbonization in the coke oven chamber and delivering the sucked gas into the gas space. CONSTITUTION:After coke in a coke oven chamber 3 is forced out and an oven lid 1 is put on, a suction fan 9 installed at the outside of the lid 1 is started to suck a high-temp. gas at about 500-550 deg.C produced during coal carbonization from an upper suction hole in a refractory of the lid 1 through a suction pipe 14. The sucked gas is delivered with the suction fan 9 through an intermediate delivery port 11, a lower deliver pipe 11', an intermediate delivery pipe 12, and a lower delivery port 12' into a gas space 4. Thus, the gas temp. in the space 4 is kept at 400 deg.C or higher, preventing the deposition of tar at a door sealing section near a door jamb 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing tar from depositing on a furnace lid seal portion of a horizontal chamber type coke oven.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 2, a furnace lid of a coke oven holds a coal or coke in a carbonization chamber 3 with a refractory 2 disposed inside a cast lid body 1. There is. The coke oven gas generated in the coal carbonization process rises in the coal or in the gas space 4 between the carbonization chamber wall 15 and the refractory 2 and is a horizontal space formed on the coal bed in the carbonization chamber 3. It is designed to be sucked out through the ascending pipe (not shown) at the top of the furnace.

[0003]

However, in the above process, the tar-like product 5 is deposited in the gas space 4,
It solidifies and causes poor door attachment / detachment, door jam 7
The sealing property between the sealing strip 6 and the sealing strip 6 is deteriorated, gas leakage occurs, and the deposited tar leaks from the sealing portion to the outside.

As a method of solving these problems, AIME
46th Ironmaking Conference, March 29th ~ April 1st
5, 1987, and the method shown in FIG. 6 disclosed in Japanese Patent Laid-Open No. 56-70087, that is, by widening the gas space 4. A method of lowering the pressure of the gas space 4, increasing the gas flow, and raising the temperature has been proposed.

Further, the method shown in FIG. 7 disclosed in Japanese Patent Laid-Open No. 63-112686, that is, air or oxygen is blown into the gas space 4 to burn a part of the generated coke gas,
A method of increasing the temperature of the gas space 4 has been proposed. A method of using the above flexible door, and
In the method of widening the gas space disclosed in Japanese Laid-Open Patent Publication No. 56-70087, the kiln mouth bricks in the carbonization chamber are worn away, and a large amount of coal circulates into the gas space when an aging furnace or humidity-controlled coal is used, There was a problem of reducing the space of the gas space.

Further, in the method of blowing air or oxygen into the gas space disclosed in JP-A-63-112686,
There were problems such as spalling of bricks and danger of gas explosion due to local heating due to combustion of coke oven gas.
It is an object of the present invention to provide a method for solving the above problems and preventing the deposition of tar in a gas space.

[0007]

DISCLOSURE OF THE INVENTION The present invention is directed to a part of coke oven gas generated during carbonization of coal in a carbonization chamber in a furnace lid seal portion composed of a door jam and a sealing strip of a horizontal chamber coke oven. From the space formed on the coal bed in the carbonization chamber, through a pipe internally provided in the upper portion of the furnace lid, is sucked by a suction fan arranged outside the furnace lid, and the sucked gas is a refractory material attached to the furnace lid. Of a coke oven characterized in that it is discharged to a low temperature part of a gas space generated between the coke chamber wall and a carbonization chamber wall, and the gas space is heated and held by the suction gas to prevent tar deposition in a furnace lid seal part. This is a method for preventing tar from depositing on the lid seal portion.

[0008]

[Operation] As a result of the measurement of the temperature change in the gas space 4 in the carbonization cycle by the inventors, the temperature in the gas space 4 was almost constant regardless of the carbonization time as shown in FIG. From this, it was found that the temperature in the normal gas space 4 was around 200 ° C. and did not change much in the coal carbonization cycle.

Further, the temperature inside the gas space 4 was forcibly raised, and after the carbonization, the condition of tar adhesion in the gas space 4 of the door refractory was investigated. If the temperature is maintained at 400 ° C or higher, tar precipitation hardly occurs.

[0010]

[Table 1]

Further, as a result of investigating the relationship between the pressure in the gas space 4 and the carbonization cycle, as shown in FIG. 4, immediately after the coal was charged into the carbonization chamber, the pressure in the gas space 4 was high and the carbonization time was long. The pressure decreased with the lapse of time, and the pressure was almost constant 5 to 6 hours after the coal was charged. That is, this is due to a change in the amount of coke gas flowing in the gas space 4, and is a change in the amount of coke gas generated during carbonization.

Therefore, the temperature in the gas space 4 is set to 400 ° C.
It has been found that the above retention is good until 5 to 6 hours have elapsed after the charging of coal. Based on the above results,
By using the method of the present invention, the deposition of tar in the gas space of the furnace lid seal portion can be prevented.

[0013]

EXAMPLE A furnace lid 1 used in one example of the present invention will be described. FIG. 1a is a cross-sectional view taken along the line AA in which the furnace lid 1 is attached to a coke oven kiln opening, and FIG. 1b shows a piping explanatory view of the furnace lid 1. First, after the coke in the carbonization chamber 3 is pushed out, after the furnace lid 1 is mounted, the suction fan 9 arranged outside the furnace lid 1 is activated to generate a high temperature of 500 to 550 ° C generated when carbonizing carbon. Gas was sucked through the suction pipe 14 from the upper suction port 10 of the furnace lid refractory.

The suction gas is sucked by the suction fan 9, the middle discharge pipe 11, the lower discharge pipe 11 ', the middle discharge port 12, and the lower discharge port 1
It was discharged into the gas space 4 through 2 '. As a result, the gas temperature in the gas space 4 can be maintained at 400 ° C. or higher, and therefore tar can be prevented from depositing on the door seal portion near the door jam 7. The temperature of the gas in the gas space 4 is measured by the temperature sensor 13 installed in the door jam 7. When the temperature is 400 ° C. or lower, the suction fan 9 supplies the high temperature gas into the gas space 4 and The temperature was kept above 400 ° C.

When the temperature is 450 ° C. or higher, the suction fan 9 is stopped to stop the supply of high-temperature gas into the gas space 4 to save the operating power of the suction fan 9.

[0016]

As a result of using the method of the present invention for the furnace lid of a coke oven, the temperature of the gas space of the furnace lid can be maintained above the tar precipitation temperature, and therefore the tar on the furnace lid seal portion can be prevented. It became possible to prevent precipitation. In addition, the tightness of the furnace lid seal part is ensured, gas leakage from the furnace lid seal part and exudation of tar are eliminated, so that the tar cleaning work by manpower is reduced, labor is saved, and there is also a problem in terms of environmental hygiene. Improved.

[Brief description of drawings]

FIG. 1 (a) is an explanatory view in which a furnace lid used in one embodiment of the present invention is attached to a kiln mouth, and FIG. 1 (b) is a sectional view taken along line AA of FIG. (B) It is piping explanatory drawing of the furnace lid used for 1 Example of this invention.

FIG. 2 is a sectional view of a conventional coke oven oven lid when the oven lid is installed in the oven.

FIG. 3 is a relationship characteristic diagram between a temperature in a gas space and a dry distillation time.

FIG. 4 is a characteristic diagram showing the relationship between the gas space pressure and the dry distillation time.

FIG. 5 is a cross-sectional view of a flexible door.

FIG. 6 is a cross-sectional view of a conventional coke oven furnace lid.

FIG. 7 is a sectional view of a conventional coke oven furnace lid.

[Explanation of symbols]

 1 Furnace cover 2 Refractory 3 Carbonization chamber 4 Gas space 5 Tar-like product 6 Seal strip 7 Door jam 8 Seal plate 9 Suction fan 10 Upper suction port 11 Middle discharge pipe 11 'Lower discharge pipe 12 Middle discharge port 12' Lower discharge Outlet 13 Temperature sensor 14 Suction pipe 15 Carbonization chamber wall 16 Heating plate 17 Support frame 18 Insulation material 19 Air or oxygen blowing nozzle 20 Charging coal or coke

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshiharu Iwashita 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Chiba Works, Kawasaki Steel Co., Ltd. (72) Akio Yokokawa 1 Kawasaki-cho, Chuo-ku, Chiba Prefecture Kawasaki Chiba Steel Works, Ltd.

Claims (1)

[Claims] 1. A part of a coke oven gas generated during carbonization in a carbonization chamber is part of a coal layer in a carbonization chamber at a furnace lid seal part composed of a door jam and a sealing strip of a horizontal chamber coke oven. From the space formed in the furnace through a pipe installed in the upper part of the furnace lid, it is sucked by a suction fan arranged outside the furnace lid, and the sucked gas is drawn between the refractory attached to the furnace lid and the carbonization chamber wall. A method for preventing tar deposition in a furnace lid seal part of a coke oven, which comprises discharging the resulting gas space to a low temperature part and heating and holding the gas space by the suction gas to prevent tar deposition in the furnace lid seal part. .