JPS6152196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for hot repairing multiple rows of combustion chambers in a horizontal chamber coke oven.

Generally, during long-term use of a coke oven, various external forces cause damage such as cracks to the combustion chamber wall, which may make it impossible to operate. In this case, it is necessary to partially reload and repair the brickwork in the combustion chamber, which is done while the coke oven is in operation. This is called hot repair. The repair is as described above, so it is necessary to prevent heat from being transmitted to the repaired part from the non-repaired part, and to prevent damage caused by cooling the non-repaired part.
In order to reduce deterioration, an insulating wall is installed on the bottom of the unrepaired part of the carbonization chamber adjacent to the combustion chamber to be repaired. Therefore, this repair has advantages such as short repair period and no hindrance to coke production.

On the other hand, the problem with this repair is that the temperature of the brickwork in the repaired combustion chamber increases. That is, the newly brick-laid combustion chamber returns to normal operation after being heated and raised in temperature. However, unless it is heated uniformly and gradually, it will suddenly expand abnormally, causing seams and hair cracks, and the repaired combustion chamber will not be able to function satisfactorily.

Conventionally, hot repair of coke ovens has been carried out, for example, in Japanese Patent Publication No. 49-23564, Japanese Patent Application Laid-Open No. 62303-1972, and Japanese Patent Application Laid-Open No. 57-1989.
It was proposed in No. 98583 and Japanese Unexamined Patent Publication No. 57-98588.
However, these are all techniques for hot repair of the combustion chamber in a single row. This is due to the fact that conventionally there was no heating method that could suppress abnormal expansion of the repaired brick wall, making it impossible to prevent joint breakage and hair cracks. Therefore, until now, hot repair of combustion chambers by simultaneous construction of two or more rows has been avoided because the technical problem remains unsolved.

The present invention was made to solve the above-mentioned problems in hot repair of coke oven combustion chambers, and it is possible to simultaneously heat multiple rows of combustion chambers without causing cracks or joint breaks in the brickwork of the repaired area. The aim is to provide a method that can be used for temporary repairs.

In the present invention, when heating the repaired combustion chamber and the adjacent carbonization chamber, at least the inside of the brick structure located below the repaired combustion chamber and the adjacent carbonization chamber and the surface on the kiln mouth side are heated. The carbonization chamber adjacent to the repaired combustion chamber is partitioned into upper and lower parts at the lower part thereof by a heat retaining plate having an opening whose opening degree can be freely adjusted and a heating means is attached to one of the heat retaining plates. Further, a heating means is inserted between the bottom of the carbonization chamber and the heat insulating plate, and the furnace mouth of the carbonization chamber adjacent to the repaired combustion chamber is covered with a furnace mouth cover having an opening whose opening degree can be freely adjusted. Then, the temperature distribution in the repaired combustion chamber and the adjacent carbonization chamber is measured, and the amount of heat supplied by the heating means and the opening degree of the heat retaining plate and the kiln opening cover are adjusted based on the temperature distribution.

As mentioned above, in the present invention, the temperature distribution in the repaired combustion chamber and the adjacent carbonization chamber is measured, and based on the results, the amount of heat supplied by the heating means arranged at various places and the opening degree of the heat retaining plate and the kiln mouth cover are determined. In other words, the amount of ventilation is adjusted. Therefore, the present invention allows fine adjustment to gradually increase the temperature in the temperature range where brick expansion is large, and also uniformly increases the temperature of the entire combustion chamber and the adjacent carbonization chamber that are repaired in multiple rows at the same time. This prevents abnormal expansion, joint breakage, hair cracks, curvature of the combustion chamber, spalling, etc. caused by sudden temperature changes in low-temperature parts.
It becomes possible to raise the temperature during simultaneous repair of multiple rows of combustion chambers.

Embodiments of the present invention will be described below based on the drawings.

In a coke oven, carbonization chambers 1 and combustion chambers 2 are arranged alternately, and a heat storage device 5 is connected to the combustion chambers at the bottom of a brick structure 4 located below the carbonization chambers 1. It is composed of Furyu 3. FIG. 1 is a cross-sectional view of a case where three rows of combustion chambers 6 are repaired simultaneously in an embodiment of the present invention in a gas-rich gun type furnace, and FIG. 2 and FIG. It is a vertical cross-sectional view taken along the line B-B, and in the case of other row numbers such as simultaneous repair of two rows or simultaneous repair of four rows, only the combustion chamber in the repaired central portion increases or decreases. A heat insulating curtain 8 is provided on the side of the non-repaired combustion chamber 2 adjacent to the carbonization chamber 7 that is in contact with the repaired combustion chamber 6 (indicated by diagonal lines), and further in the back of the repaired combustion chamber 6 as shown in FIGS. 3 and 4. A heat insulating wall 10 is installed in the carbonization chamber at the border with a certain non-repaired part 9 to ensure a working environment, and the non-repaired part is maintained at an appropriate temperature, the repaired combustion chamber 6 is dismantled, and the brickwork is rebuilt to look new again. After repairing the furnace and heating it up, it will be used as an operating furnace.

The heating method is to insert an electric heater 12 into the gas-rich horizontal duct 11 located below the repair combustion chamber from the kiln mouth 25 side, and connect the tip of the electric heater 12 and the inner part 13 of the horizontal duct (repaired and unrepaired parts). A temporary plug 14 is provided between the When rich gas does not flow through the gas-rich horizontal duct 11, it is not necessary to provide the temporary plug 14. The temporary plug 14 is removed after the temperature rise is completed and the electric heater 12 is removed. A temporary stopper 16 is placed in the upper part of the unrepaired part of the gas-rich vertical duct 15 to prevent brick debris etc. from entering during dismantling. Temporary plug 16 will be removed when new brickwork is laid. An electric heater 17 is installed at the bottom of the carbonization chamber 7 in contact with the repaired combustion chamber 6, and as shown in an enlarged view in FIG. A hot plate 18 is provided. This heat insulation plate 1
8 is provided with at least one ventilation hole 23,
As shown in FIG. 5, a ventilation opening adjustment lid 19 is temporarily placed on the heat retaining plate 18. In addition, as shown in FIG. 3 or FIG. 6, an electric heater 20 is installed on the outside of the brick structure 4 and the heat storage chamber 5 (on the surface on the kiln mouth 25 side) located below the repaired combustion chamber 6. 6 and the lower part of the carbonization chamber 7 adjacent thereto are heated to raise their temperature.

The repaired combustion chamber and the carbonization chamber are heated by electric heaters and heat transfer from the heat insulating wall 10 installed in the carbonization chamber at the boundary with the non-repaired portion 9 in the carbonization chamber 7 that is in contact with the repaired combustion chamber 6 and into the non-repaired combustion chamber. The adjacent repaired combustion chamber and carbonization chamber rely on heat transfer from the insulation curtain. Therefore, electric heaters and the like have the purpose of heating and uniformly raising the temperature.

During heating, the repaired combustion chamber 6 and the adjacent carbonization chamber 7 are heated at a predetermined temperature increase rate so that the entire temperature is uniform. for that,
A plurality of thermocouples are arranged in the repair combustion chamber 6 and the carbonization chamber 7, and the temperature distribution in each chamber 6, 7 is measured at an appropriate time. Depending on the temperature inside the repaired combustion chamber 6 and the carbonization chamber 7 in contact with the repaired combustion chamber, the kiln mouth cover 21 is sealed and the electric heaters 12, 17, 2 of each part are installed.
Combustion chamber 6 and the adjacent carbonization chamber 7 where multiple rows of combustion chambers 6 and the adjacent carbonization chamber 7 were repaired simultaneously by adjusting the setting temperature and insertion length of 0, and opening and closing of the adjusting lid 19 of the ventilation openings 23 of the heat retaining plate 18 attached to the carbonization chamber 7. It is possible to uniformly heat and raise the temperature of the entire device according to a predetermined temperature pattern, and to precisely control the temperature.

In other words, if the temperature inside the repair combustion chamber 6 is low compared to other parts and is out of the control range, the repair combustion chamber 6
The set value of the electric heater 12 attached to the horizontal duct 11 located below is adjusted to increase the amount of heat received from the lower part and raise the temperature. In addition, if the temperature on the carbonization chamber 7 side of the repair combustion chamber 6 is lower than the other side and is out of the control range, the furnace opening cover 21 of the carbonization chamber 7 is sequentially installed from the lower stage to the upper stage to increase the sealing height. 6, and adjust the set temperature of the electric heater 17 in the carbonization chamber 7 to raise the temperature. In addition, if the temperature of the kiln port 25 on the carbonization chamber 7 side of the repaired combustion chamber 6 is lower than that on the back side, the height of the kiln port cover 21 of the carbonization chamber 7 will be increased sequentially from the bottom, and the The set value and insertion length of the electric heater 12 of the gas duct 11 are adjusted to increase the heat at the kiln opening 25.

In addition, if only the lower part of the kiln mouth 25 on the carbonization chamber 7 side of the repaired combustion chamber 6 is lower than the rest, adjust the set temperature and heater insertion length of the electric heaters 12 and 17 mentioned above, and Ventilation hole 23 of plate 18
The adjusting lid 19 is opened and closed to take out the hot air from the back side to the front side to increase the amount of heat received at the lower part of the kiln mouth 25 to uniformly raise the temperature.

Figure 7 shows an example of a coke oven with a gas-rich underjet system or a gas-poor single type coke oven.
It is a longitudinal cross-sectional view of the CC plane of a figure. A hole is made in the outer wall of the heat storage chamber 5 located below the repaired combustion chamber 6, and an electric heater 22 is inserted inside to heat and raise the temperature. The adjustment method is the same as the rich gas gun method coke.

As described above, the temperature is increased from near room temperature, and when the temperature of the repaired combustion chamber reaches approximately 500℃, the insulation curtain 8 is installed, and when the temperature reaches approximately 950-1000℃, the insulation wall 1 is installed.
Remove 0. Then, once the temperature has risen to near the operating temperature, electric heaters 12, 17, 20, 2
2. Remove the heat retaining plate 18, kiln mouth cover 21, etc.
The kiln mouth 25 is closed with a furnace lid.

The present invention is not limited to the above embodiments.
For example, a radiant tube may be used as the heating means instead of an electric heater. However, when controlling the temperature with an electric heater, it is easy to adjust, especially at low temperatures, and it is easy to make fine adjustments, and there is no need to introduce combustion air, so there is little change in the temperature on the coking chamber side, and there is no combustion waste gas, making it possible to operate a coke oven. It has the advantage of being unrelated.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention in a gas-rich gun type furnace, FIG. 2 is a longitudinal sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B in FIG. A vertical sectional view, FIG. 4 is an enlarged explanatory view of the main parts of FIGS. 1 and 3,
FIG. 5 is an explanatory diagram of the adjustment lid of the heat retaining plate shown in FIG. 4,
Fig. 6 is an explanatory diagram of an electric heater installed outside a brick structure, etc., Fig. 7 is an explanatory diagram showing an example of a gas-rich underjet system or a gas-poor single coke oven, and Fig. 8 is an explanatory diagram showing an example of an electric heater installed outside a brick structure, etc. It is a longitudinal cross-sectional view taken along the line CC in FIG. 7. 1... Carbonization chamber adjacent to the repair, 2... Combustion chamber row adjacent to the repair, 3... Combustion chamber adjacent to the repair,
4... Brick structure, 5... Lid heat chamber, 6... Repaired combustion chamber, 7... Carbonization chamber, 8... Heat insulation curtain,
9...Unrepaired part of repaired combustion chamber, 10...Insulating wall,
11... Rich gas duct, 12... Electric heater for rich gas duct, 13... Back part of rich gas duct, 14... Seat plug of rich gas duct, 15... Rich gas vertical duct, 16... Temporary stopper for rich gas vertical duct , 17
... Electric heater of carbonization chamber 7, 18 ... Heat retention plate,
19... Heat retention plate adjustment lid, 20... Electric heater outside the heat storage chamber, 21... Kiln mouth cover, 22... Electric heater inside the heat storage chamber, 23... Heat retention plate adjustment port, 25... Kiln mouth.

Claims (1)

[Claims] 1 Multiple rows of combustion chambers in a horizontal chamber type coke oven,
In a method of simultaneously repairing an unrepaired combustion chamber and a carbonization chamber while heating them, when heating and raising the temperature of the repaired combustion chamber and the adjacent carbonization chamber, the lower part of the repaired combustion chamber and the adjacent carbonization chamber are heated. A heating means is attached to at least one of the inside of the brick structure and the surface of the kiln mouth side, and the carbonization chamber adjacent to the repaired combustion chamber is heated in the lower part thereof by means of a heat retaining plate having an opening whose opening degree can be freely adjusted. A heating means is inserted between the bottom of the carbonization chamber and a heat insulating plate, and the furnace opening of the carbonization chamber adjacent to the repair combustion chamber is covered with a furnace opening cover that has an opening that can be freely adjusted for repair. A coke characterized in that the temperature distribution in a combustion chamber and an adjacent carbonization chamber is measured, and the amount of heat supplied by the heating means and the opening degree of the heat retaining plate and the kiln opening cover are adjusted based on the temperature distribution. Hot repair method for furnace combustion chamber.