CN115806830A - 7.63m coke oven regenerator checker brick replacement method - Google Patents

Abstract

The invention relates to the technical field of hot-state maintenance of coke ovens, and discloses a method for replacing checker bricks in a regenerator of a 7.63m coke oven. , to ensure that the regenerator has sufficient heat source for temperature maintenance during the checker brick replacement process; B) remove the old checker bricks; C) reinstall the new checker bricks. The method for replacing the checker bricks in the regenerator of the 7.63m coke oven of the present invention, combined with the improvement of furnace wall insulation and the improvement of the furnace wall repair method after recovery, successfully completed the replacement of the checker bricks in the regenerator of the 7.63m coke oven.

Description

7.63m coke oven regenerator checker brick replacement method

technical field

The invention relates to the technical field of hot-state maintenance of coke ovens, in particular to a through-row replacement method for checker bricks in a regenerator of a 7.63m coke oven.

Background technique

The coke oven checker brick is a perforated refractory brick used for heat exchange in the coke oven regenerator. It recovers the waste heat of the exhaust gas discharged from the coke oven combustion chamber by alternately absorbing and releasing heat, and is used as heating for the coke oven fuel before combustion. It can improve the combustion efficiency of the coke oven and reduce energy consumption.

During the production process, as the service time of the coke oven goes on, the checker bricks in the coke oven regenerator will be deformed and melted due to the high temperature and the erosion of impurities in the gas, which will increase the airflow resistance in the regenerator and affect the normal heating of the coke oven. . When conventional cleaning and dredging methods are ineffective, it is necessary to replace the checker bricks in the heat storage chamber.

However, the regenerator chamber is a high-temperature area, and the top temperature reaches above 1000°C, and the furnace wall of the regenerator chamber is made of silica bricks, and irreversible damage will occur when the temperature drops below the crystal transformation point of 573°C. Part of the checker bricks can be replaced without entering the interior of the regenerator.

To enter the regenerator to replace the checker bricks, the key point is to solve the contradiction between the temperature control of the furnace wall of the regenerator and the temperature of the space that workers can enter. On the one hand, the temperature of the furnace wall in the regenerator cannot be lower than 573°C, the crystal modification transformation point of the silica brick, and on the other hand, the highest space temperature that the human body can withstand cannot exceed 120°C. The temperature of the working space can be achieved through perfect and good heat insulation materials, but the heat preservation of the furnace wall is more difficult. The regenerator has a width of 550mm and can only accommodate one person at a time. Each regenerator has 6,912 checker bricks and weighs more than 40 tons. The entire operation time is about 70 hours, and the heat dissipation in the regenerator is serious. At the same time, the combustion chamber corresponding to the regenerator is in an unheated state during the entire operation process, and it is necessary to seek a heat source for maintaining the temperature of the regenerator.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the above-mentioned technologies, to provide a 7.63m coke oven regenerator checker brick through-row replacement method, and to cooperate with the improvement of the furnace wall insulation and the recovery of the furnace wall repair method, and successfully complete the 7.63m Replacement of checker bricks in the regenerator of the entire coke oven.

In order to achieve the above object, the 7.63m coke oven regenerator checker brick replacement method designed by the present invention includes the following steps:

A) Adjust the heating system of the regenerator that needs to replace the checker bricks in advance to ensure that the regenerator has sufficient heat sources to maintain the temperature during the replacement of the checker bricks;

B) demolish the old checker bricks;

C) Reinstall the new checker bricks.

Preferably, in the step A), the adjustment of the heating system includes: assuming that the serial number of the regenerator that needs to be replaced with checker bricks is N regenerator, corresponding to N carbonization chamber stewing furnace, N-1 carbonization chamber stew furnace, N carbonization The stop heating time of the chamber stewing furnace and N+1 carbonization chamber stew furnace is adjusted to 60%, 75% and 60% of the coking time. Among them, the reverse heat transfer of the carbonization chamber is used as the heat source, and the carbonization chamber is the heating body in normal production. At the same time, the coke in the carbonization chamber can also become a heat source when the heating is stopped. According to the system analysis, the time when all the coal materials in the carbonization chamber start to shrink is about 60% of the coking time. Calculated by the heat dissipation within three days, It is determined to adjust the stop heating time of the three carbonization chamber braising furnaces to 60%, 75% and 60% of the coking time respectively, so as to ensure that there are sufficient heat sources in the combustion chamber and regenerator during operation.

Preferably, in the step A), the adjustment of the heating system includes: assuming that the serial number of the regenerator that needs to replace the checker brick is N regenerator, before stopping heating, the N-1 regenerator, N regenerator, N regenerator +1 heat storage chamber to heat up, close the gas adjustment cock and air damper when the air is rising, keep 2 to 3 exchange times, increase the temperature of the heat storage chamber in advance, and expand the width of the temperature drop curve of the heat storage chamber.

Preferably, in the step A), the adjustment of the heating system includes: assuming that the serial number of the regenerator that needs to replace the checker brick is N regenerator, during the operation, the N-1 regenerator and the N+1 regenerator The dampers are all closed, and the exhaust gas shutter is slightly opened by 1/3 to realize exhaust gas circulation, ensure heat transfer, realize controllable temperature maintenance, and transfer heat to the N regenerator to control temperature drop.

Preferably, in said step B), the following steps are included:

B1) Cover the exchange switch with an iron plate to prevent broken bricks from clogging the exchange equipment and affecting the exchange;

B2) On the coke oven machine and the coke-side operating platform, remove the coke dripping plate, and remove the sealing wall as much as possible to the same height as the checker bricks to be removed, so as to reduce the impact of cold air intrusion on the remaining checker bricks, and make a baffle. During construction gaps, cold air is blocked from entering the heat storage chamber;

B3) Use special tools to remove the checker bricks: special tools include hooks, flat shovels, and chutes, of which the chute is a U-shaped chute made of 3mm thick steel plates sealed on three sides, and the chute is installed on the checker brick to be removed. The top of the next layer of checker bricks prevents sundries from falling onto the next layer of checker bricks. The removed checker bricks are moved out along the chute through the hook, and the chute is gradually pushed inward as the upper checker bricks are taken out. In the process of removing checker bricks, if there are melted checker bricks, use a flat shovel to crush them and move them out along the chute. The checker bricks are removed in the order of "from top to bottom, from outside to inside". Provide support to prevent the checker bricks from collapsing;

B4) Cover the top of the checker bricks that have been taken out with insulation boards to prevent debris from falling to the next layer of checker bricks. As the upper checker bricks are taken out, the insulation boards are gradually pushed forward. The insulation boards are galvanized sheets with δ=1mm, δ ＝50mm ceramic fiber blanket and δ＝3mm iron plate combination, when installing, the galvanized plate surface is placed on the lower part to contact with the checker brick;

B5) After all the checker bricks of a partition are extracted, lay insulation boards on the bottom, and lay ceramic fiber blankets on the corresponding sides and top walls at the same time, as a heat insulation measure for the work area and furnace wall.

Preferably, in said step C), the following steps are included:

C1) Before installing new checker bricks, check the dimensions of the new checker bricks, determine the quality of the replacement checker bricks, and distinguish the material and brick number of the checker bricks;

C2) Each lattice brick is installed from bottom to top, and the partition wall is built after the single lattice is installed;

C3) After the grid is installed, start to restore the coke oven regenerator sealing wall. The coke oven regenerator sealing wall is built according to the original design requirements. After the coke oven regenerator sealing wall is built, the wall is coated with heat preservation Materials, complete the online replacement of checker bricks in the coke oven regenerator.

Compared with the prior art, the present invention has the following advantages: the overall replacement of the checker bricks can completely eliminate the hidden dangers of the checker bricks in the regenerator, realize the temperature maintenance of the brick wall of the regenerator during the replacement period, and improve the heat preservation of the regenerator wall by cooperating with the furnace wall. And the improvement of the restored furnace wall repair method successfully completed the replacement of the checker bricks in the regenerator of the 7.63m coke oven.

Description of drawings

Fig. 1 is a state diagram of the corresponding regenerator in the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

A 7.63m coke oven regenerator checker brick replacement method, comprising the following steps:

A) Adjust the heating system of the regenerator that needs to replace the checker bricks in advance to ensure that the regenerator has sufficient heat sources to maintain the temperature during the replacement of the checker bricks;

B) demolish the old checker bricks;

C) Reinstall the new checker bricks.

Wherein, in step A), the adjustment of the heating system includes: as shown in Figure 1, the serial number of the regenerator that needs to be replaced with checker bricks is N regenerator, corresponding to N carbonization chamber stewing furnace, and N-1 carbonization chamber stew furnace , N carbonization chamber braising furnace, N+1 carbonization chamber braising furnace stop heating time is adjusted to 60%, 75% and 60% of coking time.

Alternatively, in step A), the adjustment of the heating system includes: as shown in Figure 1, assuming that the serial number of the regenerator that needs to replace the checker brick is N regenerator, before stopping heating, N-1 regenerator, N regenerator Room, N+1 regenerator to heat up, close the gas adjustment cock, close the air damper when the air flow is up, and keep it for 2 to 3 exchange times.

In other embodiments, in step A), the adjustment of the heating system includes: as shown in Figure 1, the serial number of the regenerator that needs to replace the checker brick is N regenerator, and N-1 heat storage chamber is stored during the operation. chamber, the dampers of the N+1 regenerator are all closed, and the small replica of the exhaust gas shutter is slightly opened by 1/3.

In addition, in this embodiment, step B) includes the following steps:

B1) Cover the exchange switch with an iron plate to prevent broken bricks from clogging the exchange equipment and affecting the exchange;

B2) On the coke oven machine and the coke-side operating platform, remove the coke dripping plate, and remove the sealing wall as much as possible to the same height as the checker bricks to be removed, so as to reduce the impact of cold air intrusion on the remaining checker bricks, and make a baffle. During construction gaps, cold air is blocked from entering the heat storage chamber;

B3) Use special tools to remove the checker bricks: special tools include hooks, flat shovels, and chutes, of which the chute is a U-shaped chute made of 3mm thick steel plates sealed on three sides, and the chute is installed on the checker brick to be removed. The top of the next layer of checker bricks prevents sundries from falling onto the next layer of checker bricks. The removed checker bricks are moved out along the chute through the hook, and the chute is gradually pushed inward as the upper checker bricks are taken out. In the process of removing checker bricks, if there are melted checker bricks, use a flat shovel to crush them and move them out along the chute. The checker bricks are removed in the order of "from top to bottom, from outside to inside". Provide support to prevent the checker bricks from collapsing;

B4) Cover the top of the checker bricks that have been taken out with insulation boards to prevent debris from falling to the next layer of checker bricks. As the upper checker bricks are taken out, the insulation boards are gradually pushed forward. The insulation boards are galvanized sheets with δ=1mm, δ ＝50mm ceramic fiber blanket and δ＝3mm iron plate combination, when installing, the galvanized plate surface is placed on the lower part to contact with the checker brick;

B5) After all the checker bricks of a partition are extracted, lay insulation boards on the bottom, and lay ceramic fiber blankets on the corresponding sides and top walls at the same time, as a heat insulation measure for the work area and furnace wall.

In the present embodiment, step C) includes the following steps:

C1) Before installing new checker bricks, check the dimensions of the new checker bricks, determine the quality of the replacement checker bricks, and distinguish the material and brick number of the checker bricks;

C2) Each lattice brick is installed from bottom to top, and the partition wall is built after the single lattice is installed;

C3) After the grid is installed, start to restore the coke oven regenerator sealing wall. The coke oven regenerator sealing wall is built according to the original design requirements. After the coke oven regenerator sealing wall is built, the wall is coated with heat preservation Materials, complete the online replacement of checker bricks in the coke oven regenerator.

Claims (6)

1. A 7.63m coke oven regenerator checker brick replacement method is characterized in that: comprising the following steps: A) Adjust the heating system of the regenerator that needs to replace the checker bricks in advance to ensure that the regenerator has sufficient heat sources to maintain the temperature during the replacement of the checker bricks; B) demolish the old checker bricks; C) Reinstall the new checker bricks. 2. As claimed in claim 1, the 7.63m coke oven regenerator checker brick replacement method is characterized in that: in the step A), the adjustment of the heating system includes: setting the serial number of the regenerator whose checker brick needs to be replaced N regenerator, corresponding to N carbonization chamber stewing furnace, adjust the stop heating time of N-1 carbonization chamber stew furnace, N carbonization chamber stew furnace, N+1 carbonization chamber stew furnace to 60%, 75% and 60%. 3. As claimed in claim 1, the 7.63m coke oven regenerator checker brick replacement method is characterized in that: in the step A), the adjustment of the heating system includes: setting the serial number of the regenerator whose checker brick needs to be replaced For N regenerators, heat up N-1 regenerators, N regenerators, and N+1 regenerators before stopping heating, close the gas adjustment cock and air damper when the air is rising, and keep 2 to 3 exchanges time. 4. As claimed in claim 1, the 7.63m coke oven regenerator checker brick replacement method is characterized in that: in the step A), the adjustment of the heating system includes: setting the serial number of the regenerator whose checker brick needs to be replaced It is N regenerator. During the operation, all the dampers of N-1 regenerator and N+1 regenerator are closed, and the exhaust gas switch is slightly opened by 1/3. 5. The 7.63m coke oven regenerator checker brick replacement method according to claim 1, characterized in that: said step B) includes the following steps: B1) Cover the exchange switch with an iron plate to prevent broken bricks from clogging the exchange equipment and affecting the exchange; B2) On the coke oven machine and the coke-side operating platform, remove the coke dripping plate, and remove the sealing wall as much as possible to the same height as the checker bricks to be removed, so as to reduce the impact of cold air intrusion on the remaining checker bricks, and make a baffle. During construction gaps, cold air is blocked from entering the heat storage chamber; B3) Use special tools to remove the checker bricks: special tools include hooks, flat shovels, and chutes, of which the chute is a U-shaped chute made of 3mm thick steel plates sealed on three sides, and the chute is installed on the checker brick to be removed. The top of the next layer of checker bricks prevents sundries from falling onto the next layer of checker bricks. The removed checker bricks are moved out along the chute through the hook, and the chute is gradually pushed inward as the upper checker bricks are taken out. In the process of removing checker bricks, if there are melted checker bricks, use a flat shovel to crush them and move them out along the chute. The checker bricks are removed in the order of "from top to bottom, from outside to inside". Provide support to prevent the checker bricks from collapsing; B4) Cover the top of the checker bricks that have been taken out with insulation boards to prevent debris from falling to the next layer of checker bricks. As the upper checker bricks are taken out, the insulation boards are gradually pushed forward. The insulation boards are galvanized sheets with δ=1mm, δ ＝50mm ceramic fiber blanket and δ＝3mm iron plate combination, when installing, the galvanized plate surface is placed on the lower part to contact with the checker brick; B5) After all the checker bricks of a partition are extracted, lay insulation boards on the bottom, and lay ceramic fiber blankets on the corresponding sides and top walls at the same time, as a heat insulation measure for the work area and furnace wall. 6. The 7.63m coke oven regenerator checker brick replacement method according to claim 1, characterized in that: the step C) includes the following steps: C1) Before installing new checker bricks, check the dimensions of the new checker bricks, determine the quality of the replacement checker bricks, and distinguish the material and brick number of the checker bricks; C2) Each lattice brick is installed from bottom to top, and the partition wall is built after the single lattice is installed; C3) After the grid is installed, start to restore the coke oven regenerator sealing wall. The coke oven regenerator sealing wall is built according to the original design requirements. After the coke oven regenerator sealing wall is built, the wall is coated with heat preservation Materials, complete the online replacement of checker bricks in the coke oven regenerator.

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