JPH07188665A - Hot repair of brick work of coke oven chamber wall - Google Patents

Abstract

PURPOSE:To prevent cracks in bricks of a coke oven chamber and a heat storage chamber, cuts in joints, and thermal spalling of a newly built-in brick. CONSTITUTION:After the temp. of a combustion room 2 adjacent to a coke oven chamber 1 with a damaged brick therein is reduced to about 800 deg.C and the damaged brick is replaced with a new silica brick 13 highy resistant to thermal shock, a cooling pipe 20 is inserted through an inspection hole 11 of a flue wherein the silica brick 13 is built in and a cooling gas is blown from a cooling pipe 20 onto the brick 13 to keep the temp. of the brick 13 at 500 deg.C or lower. Thus the repaired wall of the coke oven chamber can be used stably for a long time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot repair method for a brick in a coke oven which can be transposed while maintaining a high temperature of the brick in the coke oven when the damaged brick in the coke oven is transshipped. It is about.

[0002]

2. Description of the Related Art Conventionally, a method for transshipment of damaged bricks in a coke carbonization chamber wall brick has been performed at a temperature (400 to 5) at which the temperature of the carbonization chamber to be transposed does not cause thermal spalling of a general-purpose silica brick.
A general method was to lower the temperature of the combustion chamber to (00 ° C.), insert a heat transhipment heat insulating capsule into the carbonization chamber, and transship the damaged bricks.

Further, in the method in which the temperature of the carbonizing chamber is set to a temperature higher than the above temperature, the hot transshipping silica brick causes thermal spalling and cracks in the brick, so hot repair is required again. In order to prevent this, transhipment and repair were performed with high-alumina bricks and chamotte bricks that do not easily cause thermal spalling.

[0004]

In the method in which the temperature of the carbonization chamber is set to a temperature at which the silica stone brick does not cause thermal spalling, the temperature of the carbonization chamber is excessively lowered and the bricks in the carbonization chamber are cut off at joints or sound parts. There is a problem that the temperature of the heat storage chamber further decreases with the cracking of the brick and the temperature of the carbonization chamber decreases, which causes the joint breakage of the brick of the heat storage chamber wall.

In the method of setting the temperature of the carbonization chamber to a temperature higher than the above temperature and transshipping with bricks which are less likely to undergo thermal spalling, the thermal expansion characteristics of the bricks are linear, so that when the bricks are used for 2 to 3 years. Brick cracks and collapses, requiring repair. At this time, the surrounding healthy silica stone bricks are also affected, and there is a problem that a wider area of repair is required at the time of the next repair.

It is an object of the present invention to provide a method for preventing cracking or joint breakage of carbonization room bricks and heat storage room bricks and thermal spalling of replacement bricks.

[0007]

The present invention achieves the above object by the following method. The method lowers the temperature of the combustion chamber adjacent to the carbonization chamber with damaged bricks to 800 ° C,
After transposing the damaged brick into a silica stone brick with high thermal shock resistance, insert a cooling pipe from the inspection hole of the flue where the transposing brick is located, blow a cooling gas from the cooling pipe to the transposing brick, and change the temperature of the transposing brick. The feature is that the temperature is maintained at 500 ° C. or lower for a certain period of time. The temperature drop in the combustion chamber adjacent to the carbonization chamber with damaged bricks is preferably about 800 ° C. The time for maintaining the transshipment brick at 500 ° C. or lower is preferably about 30 minutes.

[0008]

Since the temperature drop in the combustion chamber adjacent to the carbonization chamber with damaged bricks is about 800 ° C., it is possible to prevent cracking or joint breakage of the carbonization chamber bricks and the heat storage chamber bricks. Table 1 shows the thermal shock test results of the silica stone brick used in the method of the present invention and the conventional transshipment silica stone brick.

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

[0010]

[Table 1]

It can be seen from Table 1 that the conventional bricks (conventional bricks) can withstand thermal shock up to 200 ° C., but the bricks of the present invention (inventive brick) can withstand thermal shock up to 500 ° C. I understand. That is, the temperature of the carbonization chamber is 800
Even at ° C, if the brick used in the present invention is kept at 500 ° C or lower for about 30 minutes after transshipment, thermal spalling does not occur.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view for explaining the method of the present invention, and FIG.
Explanatory drawing of the cooling pipe of the transshipment brick used for this invention, FIG.
FIG. 4 is a diagram showing a state in which an air-cooled capsule is inserted into a carbonization chamber, and FIG. 4 is a diagram showing a state in which damaged bricks in the carbonization chamber are being transshipped using the air-cooled capsule.

The method of the present invention is carried out as follows. The temperature of the combustion chamber 2 adjacent to the carbonization chamber 1 having damaged bricks is gradually lowered to about 800 ° C. over several days. When the temperature of the combustion chamber 2 drops to the above temperature, the carbonization chamber 1
Open the furnace lid and insert the air-cooled capsule 3. As shown in FIG. 4, the air-cooled capsule 3 has a box frame made of chevron steel and the like, and the ceramic fiber boards 4 are attached to the ceiling, the front surface, and the four side surfaces to insulate the radiant heat from the bricks in the carbonization chamber. It has become. Then, cooling air is blown into the capsule by a blower 5 installed outside the air-cooled capsule 3 through a duct 6 provided in the capsule. Reference numeral 7 is an exhaust duct for exhausting the air that has cooled the inside of the capsule to the outside of the capsule. As shown in FIG. 3, the air-cooled capsule 3 is inserted and installed in the carbonization chamber 1 by a tow truck 8 and a chain block 9.

After entering the air-cooled capsule 3, the damaged brick is disassembled by a coal pick or the like using the opening 10 opened in the capsule. 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 bricks to be repaired is completed, the combustion chamber 2
Insert the cooling pipe 20 from the inspection hole 11 on the top of the
Keep a minimum amount of air flowing to prevent heat damage to the.
The combustion chamber 2 is composed of a plurality of flues, and an inspection hole 11 is provided at the top of each flue. Therefore, the inspection hole at the top of the combustion chamber and the inspection hole at the top of the flue are the same.

As shown in FIG. 2, the cooling pipe 20 is made of SUS.
A 304A 25A pipe 21 has a plurality of holes 22 of 5 to 10 mmφ (3
Opened. Cooling air is blown from the holes 22 toward the transshipment brick. The portion other than the holed portion of the tube 21 is wound with a ceramic fiber 23 and insulated. A flange 24 is attached to the upper part of the cooling pipe 20, and the flange 24 is so arranged that the hole 22 reaches the position of the transshipment brick 13 when the cooling pipe 20 is inserted from the inspection hole 11 and the lower surface of the flange 24 contacts. , Is attached to the upper part of the cooling pipe 21. A thermocouple temperature-measuring contact 25 for measuring the ambient temperature near the surface of the transshipment brick 13 is provided so as to project from the hole 22 of the cooling pipe in the cooling air blowing direction. Reference numeral 26 is a thermocouple lead wire, and 27 is a rubber hose connected to the upper portion of the cooling pipe 20.

Mortar is applied to the transshipment brick (silica brick having high thermal shock resistance) 13 with a trowel, and the demolished portion is brick-laid. After the bricks have been stacked, the air-cooled capsule 3 is taken out of the carbonization chamber. When the brickwork is complete, open the valve further to increase the cooling air volume. While observing the measurement value of the thermocouple, the cooling air amount is adjusted so that the ambient temperature near the surface of the transshipment brick 13 does not exceed 500 ° C. This ambient temperature is about 30
Hold for minutes. After that, gradually reduce the cooling air volume to about 800 ° C.
The temperature rises to (combustion chamber temperature) in about 30 minutes, and the cooling pipe 20
Is removed from the combustion chamber 2 and the hot repair work is completed.

In the actual furnace, NO. 30, NO32, NO. 33 and N
O. A cooling pipe was inserted and installed in each of the flues of No. 34, and the damaged bricks (diagonal lines) in the 24th and 25th steps of the carbonization chamber shown in Fig. 6 were transferred to silica bricks having high thermal shock resistance using the method of the present invention. After that, the carbonization chamber was used for a long time, but no abnormality was found in the bricks in the carbonization chamber.

[0018]

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

[Brief description of drawings]

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

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

FIG. 3 is a view 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 the 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 brick in a carbonization chamber showing a repaired portion of a damaged brick by the method of the present invention.

[Explanation of symbols]

 1 Carbonization chamber 2 Combustion chamber 12 Carbonization chamber wall brick 13 Transhipment brick 20 Cooling pipe 22 Hole 25 Thermocouple temperature measuring junction

Claims (1)

[Claims] 1. The inspection hole of the flue where the transshipment brick is located after the temperature of the combustion chamber adjacent to the carbonization chamber with the damaged brick is lowered to about 800 ° C. and the damaged brick is transshipped to silica stone brick with high thermal shock resistance. Cooling pipe from the cooling pipe to the transshipment brick, and the temperature of the transshipment brick is adjusted to 5
A hot repair method for bricks in a carbonization chamber of a coke oven, which is characterized by maintaining the temperature below 00 ° C for a certain period of time.