JPS5827834B2 - Method for increasing the temperature of the wall of the coke oven remodeled carbonization chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for raising the temperature of a wall of a renovated carbonization chamber of a coke oven, more specifically, after the wall of a coke oven of a coke oven is renovated, the temperature of the renovated wall is raised uniformly and gently over the entire surface. This invention relates to a temperature raising method that eliminates the inconvenience caused by rapid local temperature rise.

Normally, a room-furnace type coke oven consists of a large number of carbonization chambers and heating chambers arranged in alternating rows, but after many years of use, the walls of the carbonization chambers are damaged and become inoperable, resulting in a so-called dead oven.

However, it is extremely rare for the entire furnace group to become a dead kiln at the same time, and usually only one or several furnaces fall into this situation.

In this case, the operation of the dead kiln will be suspended.
Not only does the amount of coke produced in the furnace group decrease, but even the heating chamber adjacent to the dead kiln cannot be heated because it is necessary to heat the adjacent carbonization chamber, which is in operation. As a result, the productivity of the reactor group as a whole will drop significantly.

In such a dead kiln, the carbonization chamber wall is severely damaged, but the brickwork at the top of the furnace and the f-section heat storage chamber usually has little damage, so if only the brick wall of the carbonization chamber is reloaded, the furnace can be operated again. becomes available.

In a room furnace type coke oven, the carbonization chamber and heating chamber are arranged alternately as described in -L, so the wall of the carbonization chamber is the wall of the immediate heating chamber, and therefore the carbonization chamber wall brick is Reloading also means reloading the bricks on the walls of the heating chamber.

(Note: As there is a relationship between the walls of the carbonization chamber and the wall of the immediate heating chamber, in the above explanation and the explanation that will appear later, the heating chamber adjacent to the carbonization chamber shares the wall that will be renovated. It excludes the heating chamber and refers to the heating chamber located next to it.

Also, for the side of the carbonization chamber that has not been renovated, this corresponds to the directly adjacent heating chamber.

) This reloading of bricks is carried out with the brickwork at the top of the furnace suspended using a special hanging jig, and the reloaded directrix brickwork can only be used after it has been dried.

However, this drying of the new line tiles must be done with sufficient control.

For example, rapid temperature rises can cause brick joints to break due to rapid drying and cracks due to thermal shock, making it unusable even if the bricks are reloaded.

Such inconvenience also arises from the following reasons.

That is, the walls of the heating chamber on both sides of the renovated carbonization chamber (the unrenovated walls) have already been heated and dried, and if they are cooled below this temperature, joint cuts and cracks will occur.

Therefore, this heating chamber must be kept above a certain temperature.

Therefore, even while the walls of the carbonization chamber are being renovated, the temperature of the adjacent heating chamber is maintained above a certain level.

Therefore, if the brickwork of the walls of the renovated carbonization chamber is left as it is, it will naturally be exposed to the radiant heat from the adjacent heating chamber and be rapidly heated, causing problems such as cracking.

Conventionally, the temperature raising methods for drying the walls of the renovated carbonization chamber include (a) gas drying from kiln 1, and (b) radiant heat from the adjacent furnace (
A method using heat transfer (which also involves heat transfer) is known.

When method (a) is used, the temperature is raised sufficiently, but it is necessary to provide vents and other equipment for waste gas treatment. Therefore, it is advantageous to sufficiently control the temperature increase.

Renovation of the carbonization chamber wall includes full wall renovation and partial wall renovation, but especially in the case of partial wall renovation, the old line brickwork part is in contact with the new brickwork part, and the expansion of the new brickwork part when the temperature rises. power is 11
” Appropriate heating temperature is required as stress is applied to the brickwork.

Furthermore, in partial renovation, the remaining part of the Japanese bricks is in a high temperature range, so
The temperature of the new bricks directly adjacent to the new bricks increases, while the new bricks that are not directly behind the old bricks do not have the above-mentioned heat source, so a temperature difference already occurs before the temperature rise starts.

This tendency is noticeable in the inner part of the new brick area in the furnace length direction, near the kiln mouth, and above and below in the furnace height direction.

These temperature differences cause a difference in the expansion of the new bricks, and when this difference becomes large around 200 to 300℃, where the amount of expansion of special refractory bricks is large, the expansion in the furnace length direction, furnace height direction, and furnace width direction increases. As the expansion difference becomes larger and larger, damage to old bricks and overhanging of the furnace walls in the furnace length direction, and cracked joints and falling of the heating chamber partition bricks in the furnace height direction become noticeable.

The purpose of the present invention is to eliminate such inconveniences and provide a method for uniformly raising the temperature at various locations during the temperature raising process of the renovated wall. When the temperature is raised by heat from an adjacent heating chamber, a temporary furnace lid equipped with a plurality of air circulation holes in the vertical direction is installed in the renovated carbonization chamber, and the degree of opening of the air circulation holes is adjusted. A wall of a renovated carbonization chamber of a coke oven characterized by controlling the amount of air flowing in from an air inlet and flowing out from a coal charging port of a coke oven to prevent a local temperature rise on the wall of the renovated carbonization chamber. It depends on the heating method.

The details of the method of the present invention will be explained below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of the top of the kiln mouth of a coke oven in which the method of the present invention is implemented, Fig. 2 is a schematic longitudinal cross-sectional view of the vicinity of the coke oven, and Fig. 3
The figure is a schematic vertical side view of the coke oven.

In the figure, 1 is the carbonization chamber of the coke oven, 2 is the top of the coke oven carbonization chamber, 3 is the passage leading to the riser pipe, 4 is the coking coal charging port, 5 is the brickwork at the bottom of the furnace, and 6 is the temporary furnace lid. The area from the brickwork section 5 at the bottom of the furnace to the top section 2 is constructed of refractory bricks.

Reference numeral 7 denotes an air circulation port provided in the temporary furnace lid 6, 8 an adjustment plate for adjusting the opening degree of the air circulation port 7, 9 a guide for guiding the adjustment plate 8, and 10 for pressing and stopping the adjustment plate 8. It is a retainer bolt.

In the method of the present invention, the damaged furnace wall (in the case of the entire surface, in the case of a part, including the side wall) of the carbonization chamber is renovated, and when drying the renovated part, the temporary furnace lid 6 shown in the drawing is placed at the kiln mouth. Installing.

The temporary furnace lid 6 is provided with a plurality of air passages 1J7 in the vertical direction.

The dimensions and number of air circulation lowers can be selected as appropriate.

Adjustment plates 8 that slide by guides 9 are provided at each of the air flow openings γ, and the opening of the air flow lower can be adjusted by 1 degree, and can be fixed at a desired opening degree using a presser bolt 10.

The temporary furnace cover 6 is attached to both or one of the extrusion side and the coke side of the kiln mouth of the renovated carbonization chamber.

If the renovation covers the entire wall, it is best to install it on both sides, and if the renovation is off to one side of the wall, it is best to install it only on the kiln opening on the side closest to it.

That is, it may be selected as appropriate depending on the situation of the renovated wall portion.

The kiln opening to which the temporary furnace cover is to be applied according to the method of the invention is selected as follows.

When renovating the side wall of the nth carbonization chamber in a coke oven group,
The carbonization chamber and heating chamber are arranged in the following order.

l]-2 heating → n-1 carbonization chamber → n-1 heating chamber → n carbonization chamber → n heating chamber → n''-1 carbonization chamber... In the n carbonization chamber, n-1 heating chamber side If only the walls of the carbonization chamber are to be renovated, it is at least essential to install a temporary furnace cover only on the carbonization chamber.

In this case, the n-1 heating chamber is in a dormant state, but the n-2 heating chamber is in an operating state, which has some influence, so the n-1
Although it is not essential, it is preferable to provide a temporary furnace cover to the kiln mouth of the carbonization chamber to adjust the temperature.

Similarly, when renovating both side walls of the carbonization chamber n, it is sufficient to install a temporary furnace cover only on the carbonization chamber n, but it is also necessary to install temporary lids on the carbonization chamber n-1 and n + 1 at the same time. It is preferable to adjust the temperature by the method of the present invention.

When renovating a carbonization chamber wall, the adjacent heating chamber that shares the wall being renovated, such as a student, is out of service, but the other wall of that heating chamber is at a high temperature, and the wall of the renovated carbonization chamber is The wall (IIJ) facing the renovated wall is also hot, and the renovated wall is heated by their radiant heat.

In order to understand the temperature rise due to heating, thermoelectric machining was embedded in the renovated wall at multiple locations in the furnace length direction, furnace height direction, and furnace width direction, and the temperature at each location was measured to determine the temperature distribution. According to the air circulation “1
Adjust the opening degree of 7.

In other words, some of the cold air flowing in from the air circulation lower may flow out from the upper air circulation lower, but most of it flows out from the coking coal charge ``]4 at the top of the furnace to prevent rapid temperature rise. 1
-1 d.

In general, the upper part of the coke oven wall tends to be hotter than the lower part, but the temperature measured by the upper 1jα thermocouple shows that
- If the temperature is higher in the upper part, in the air flow lower part of the temporary furnace cover 6, the opening of the air flow opening in the lower part (1 degree) should be made smaller and the 4th place should be made larger.

In the direction of the furnace length, the temperature at the back of the kiln with the temporary furnace lid installed tends to rise, so open the coking coal charging inlet located above the back of the kiln. The inflow of cold air is made to flow according to each case.

As described above, the respective opening degrees of the air circulation lowers provided on the temporary furnace cover, the opening and closing of coking coal charging 1, the flue lid, etc. are operated as appropriate according to the high temperature distribution state of the renovated wall. By changing the amount of cool air flowing and the direction of the cool air flow, it is possible to prevent local temperature rises on the renovated wall surface, and to prevent joint breaks and cracks in the brickwork.

As a result of implementing the present invention, in a large coke oven, the temperature difference between each part can be suppressed to 50° C. or less, and the expansion difference caused by this is 10 mm or less.

If the difference in expansion is within this level, no adverse effects will occur.

In addition, the applicant previously applied for the patent application No. 1923564.
The invention of No. 1 relates to a method for repairing the brickwork of a coke oven heating chamber wall, which involves heating and drying the brickwork of the remodeled heating chamber while attaching a heat insulating material to the wall surface of the carbonization chamber carved into the remodeled heating chamber.
This method is even more effective when used in combination with the method of the present invention.

What has been explained above and shown in the drawings is related to typical examples to aid understanding of the present invention, and the present invention is not limited to these examples, and other changes and modifications may be made within the gist of the invention. Modifications can be made.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of the kiln mouth of a coke oven in which the method of the present invention is implemented, FIG. 2 is a schematic longitudinal side view of the vicinity of the kiln mouth, and FIG. 3 is a schematic longitudinal side view of the coke oven. In the figure, 1 is the carbonization chamber of the coke oven, 4 is the charging port for coking coal,
6 is a temporary furnace lid, r is an air circulation port, 8 is an adjustment plate that adjusts the opening degree of the air circulation lower, 9 is a guide that guides the adjustment plate 8, 1
0 is the holding bolt of the adjustment plate.

Claims (1)

[Claims] 1 In order to raise the temperature of the wall of the renovated carbonization chamber of the coke oven using heat from the adjacent heating chamber, the renovated carbonization chamber is fitted with a temporary furnace lid that is equipped with a plurality of air circulation ports in the vertical direction. By adjusting the opening degree of the mouth, the amount of air flowing in from the air inlet and flowing out from the coal charging port of the coke oven is controlled, thereby preventing local temperature rise of the wall of the renovated coking chamber. How to raise the temperature of a modified carbonized wall of a coke oven.