JP2795149B2 - Hot repair method of coke oven carbonization room wall brick - 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 for hot repair of a brick in a coke oven which can be replaced while maintaining a high temperature of the brick in the coke oven when replacing the damaged brick in the coke oven. It is about.

[0002]

2. Description of the Related Art Conventionally, in a method of refilling damaged bricks of a coke carbonization chamber wall brick, the temperature of the carbonization chamber to be transposed is set to a temperature (400 to 5) at which general silica brick does not cause thermal spalling.
(00 ° C.), a method of lowering the temperature of the combustion chamber, inserting a heat insulating capsule for hot transfer into the carbonization chamber, and transferring the damaged brick was common.

[0003] In the method of setting the temperature of the carbonization chamber to a temperature higher than the above-mentioned temperature, the silica brick for hot transshipment causes thermal spalling and cracks in the brick. In order to prevent this, transhipment repairs have been made with high alumina bricks or chamotte bricks, which are unlikely to cause thermal spalling.

[0004]

In the method in which the temperature of the carbonization chamber is set to a temperature at which the silica brick does not cause thermal spalling, the temperature of the carbonization chamber is excessively reduced, and the joint of the carbonization chamber brick is broken and a sound portion is formed. There is a problem that the temperature of the heat storage chamber further decreases due to the cracking of the brick and the reduction of the temperature of the carbonization chamber, thereby causing the joint of the wall brick of the heat storage chamber to break.

In the method in which the temperature of the carbonization chamber is set to a temperature higher than the above-mentioned temperature and the bricks are less likely to cause thermal spalling, the bricks are used for 2-3 years because the thermal expansion characteristics of the bricks are linear. The bricks are cracked and collapsed, and need to be repaired. At this time, there is also a problem that the surrounding healthy silica brick is affected, and the next repair requires a wider range of repair.

[0006] It is an object of the present invention to provide a method for preventing cracking of a brick in a carbonization chamber and a brick in a heat storage chamber, or breakage of joints and thermal spalling of a replacement brick.

[0007]

According to the present invention, the above object is achieved by the following method. The method reduces the temperature of the combustion chamber adjacent to the charring chamber with the damaged brick to 800 ° C,
After replacing the damaged brick with a high-impact-resistance silica stone brick, insert a cooling pipe from the inspection hole of the flue where the replacement brick is located, blow cooling gas from the cooling pipe on the replacement brick, and reduce the temperature of the replacement brick. It is characterized in that the temperature is maintained at 500 ° C. or lower for a certain time. The temperature drop in the combustion chamber adjacent to the carbonization chamber with the damaged brick is preferably about 800 ° C. In addition, the time for maintaining the transfer bricks at 500 ° C. or lower is preferably about 30 minutes.

[0008]

The falling temperature of the combustion chamber adjacent to the carbonization chamber having the damaged brick is set to about 800 ° C., so that the bricks in the carbonization chamber and the bricks in the heat storage chamber can be prevented from cracking or joint breakage. Table 1 shows the results of the thermal shock tests of the silica brick used in the method of the present invention and the conventional silica brick for transhipment.

The silica brick used in the present invention has a high purity of 96.5% of SiO ₂ component mixed with fused silica particles, and has a lower coefficient of thermal expansion and a lower elastic modulus than conventional silica brick. have. In this test, a test sample having the same dimensions (315 × 125 × 105 mm) as the repair brick was directly inserted into an electric furnace furnace heated to a predetermined temperature in advance, held for 2 hours, and then gradually cooled in the furnace.

[0010]

[Table 1]

From Table 1, it can be seen that the conventionally used bricks (conventional bricks) can withstand thermal shocks only up to 200 ° C., whereas the bricks of the present invention (the bricks of the present invention) can withstand thermal shocks up to 500 ° C. I understand. That is, the temperature of the carbonization chamber is 800
Even at ℃, if the brick used in the present invention is kept at 500 ℃ or less for about 30 minutes after transshipment, thermal spalling does not occur.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating the method of the present invention, and FIG.
Explanatory drawing of the cooling pipe of the transfer brick used in the present invention, FIG. 3
FIG. 4 is a view showing a state in which the air-cooled capsule is inserted into the carbonization chamber, and FIG. 4 is a view showing a state in which damaged bricks in the carbonization chamber are transshipped using the air-cooled capsule.

The method of the present invention is performed as follows. The temperature of the combustion chamber 2 adjacent to the carbonization chamber 1 having the damaged brick is gradually lowered over several days so as to be about 800 ° C. When the temperature of the combustion chamber 2 drops to the above temperature, the carbonization chamber 1
Is opened, and the air-cooled capsule 3 is inserted. As shown in FIG. 4, the air-cooled capsule 3 has a ceramic fiber board 4 attached to a ceiling, a front surface, and four side surfaces of a box frame made of angle iron or the like to insulate radiant heat from the carbonization room brick. It has become. Then, cooling air is sent into the capsule by a blower 5 installed outside the air-cooled capsule 3 via a duct 6 arranged in the capsule. Reference numeral 7 denotes a discharge duct for discharging air cooled in the capsule to the outside of the capsule. The air-cooled capsule 3 is inserted and installed in the carbonization chamber 1 by a tow truck 8 and a chain block 9 as shown in FIG.

After entering the air-cooled capsule 3 and using the opening 10 opened in the capsule, the damaged brick is dismantled by a call pick or the like. Reference numeral 12 denotes a carbonization chamber brick 12 provided between the carbonization chamber 1 and the combustion chamber 2. After the dismantling of the part to be repaired is completed, the combustion chamber 2
The cooling pipe 20 is inserted through the inspection hole 11 on the furnace
Keep the air flowing to a minimum to avoid thermal damage.
The combustion chamber 2 is composed of a plurality of flues, and has an inspection hole 11 at the furnace top of each flue. Therefore, the inspection hole at the top of the combustion chamber and the inspection hole at the top of Flue are the same.

As shown in FIG. 2, the cooling pipe 20 is made of SUS.
304, a plurality of holes 22 having a diameter of 5 to 10 mm (3 in FIG.
Open). Cooling air is blown out from the holes 22 toward the transshipment bricks. The portion other than the perforated portion of the tube 21 is insulated by winding a ceramic fiber 23. A flange 24 is attached to the upper part of the cooling pipe 20 so that when the cooling pipe 20 is inserted from the inspection hole 11 and the lower surface of the flange 24 comes into contact, the hole 22 reaches the position of the transfer brick 13. , Is mounted on the upper part of the cooling pipe 21. A thermocouple temperature measuring contact 25 for measuring an ambient temperature near the surface of the transposing brick 13 is provided so as to protrude from a hole 22 of the cooling pipe in a cooling air blowing direction. 26 is a lead wire of a thermocouple, and 27 is a rubber hose connected to the upper part of the cooling pipe 20.

A mortar is applied to the transfer bricks (silica bricks having high thermal shock resistance) 13, and the bricks are piled up on the dismantled portions. When the brickwork is completed, the air-cooled capsule 3 is taken out of the carbonization chamber. When the brickwork is completed, open the valve further and increase the cooling air volume. While observing the measurement value of the thermocouple, the amount of cooling air is adjusted so that the ambient temperature near the surface of the transfer brick 13 does not become 500 ° C. or more. This ambient temperature is about 30
Keep for a minute. Then, gradually reduce the amount of cooling air to about 800 ° C.
(Combustion chamber temperature) over about 30 minutes.
From the combustion chamber 2 and the hot repair work is completed.

In the actual furnace, NO. 2 shown in FIG. 30, NO32, NO. 33 and N
O. Cooling pipes were inserted and installed in each of the flues No. 34, and damaged bricks (hatched lines) of the 24th and 25th stages in the carbonization chamber shown in FIG. 6 were replaced with silica bricks having high thermal shock resistance using the method of the present invention. After that, the carbonization room was used for a long time, but no abnormality was found in the carbonization room wall brick.

[0018]

According to the present invention, the damaged brick is replaced with a silica brick having a high thermal shock resistance, and the replaced brick is maintained at a temperature at which thermal spalling does not occur by a cooling pipe inserted from a flue inspection hole for a certain period of time. Therefore, the effect that the carbonized chamber wall after the repair can be used stably for a long time is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a method of the present invention.

FIG. 2 is an explanatory diagram of a cooling pipe of a transshipment brick used in the present invention.

FIG. 3 is a diagram showing a state where an air-cooled capsule is inserted into a carbonization chamber.

FIG. 4 is a diagram showing a state in which damaged bricks in a carbonization chamber are being transshipped using an air-cooled capsule.

FIG. 5 is a partial cross-sectional view of a combustion chamber in which damaged bricks have been repaired by the method of the present invention.

FIG. 6 is a partial front view of a carbonized room brick showing a repaired portion of a damaged brick according to the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coalization room 2 Combustion room 12 Coalization room wall brick 13 Transformation brick 20 Cooling pipe 22 Hole 25 Thermocouple of thermocouple

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C10B 29/06

Claims (1)

(57) [Claims] 1. The temperature of a combustion chamber adjacent to a carbonization chamber having a damaged brick is lowered to about 800 ° C., and the damaged brick is replaced with a silica brick having a high thermal shock resistance. The cooling gas is blown from the cooling pipe to the refill brick, and the temperature of the
A method for hot repair of bricks in a coke oven carbonization chamber, which is maintained at a temperature of 00 ° C. or less for a certain period of time.