The quality requirements of the checker bricks in the heat storage chamber are mainly as follows:
1. In order to reduce the friction resistance of the gas flowing in the checker bricks and make the resistance in each heat storage chamber consistent, it is convenient to master the heating system, and the holes of the upper and lower layers of the checker bricks are required to be aligned as much as possible.
2. Keep the checker bricks clean to avoid blockage of the brick holes and reduce the number of cleaning times during production to improve heating efficiency.
3. The bricklayer should be laid smoothly and have a good staggered width.
4. Maintain necessary expansion joints. The gas flow space at the top of the heat storage chamber should maintain a certain cross-sectional area according to the design to prevent vortexes from being generated when the gas is distributed at the top of the heat storage chamber.
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Construction of checker bricks
The laying time of checker bricks is divided into two construction methods according to the width of the regenerator: laying at the same time as the regenerator furnace wall (first laying) and laying after the entire furnace body is built and cleaned (latter laying). According to construction experience, when the net width of the regenerator is less than 310 mm (such as Otto coke oven), the construction method of laying checker bricks first should generally be adopted. This is because it is more difficult to lay checker bricks later in a narrow regenerator.
The construction method of laying checker bricks first has several advantages: First, because the workers are standing on the wall of the regenerator to lay checker bricks, the operating conditions are better, and it is easy to check after laying. Therefore, it can ensure that each checker brick hole is connected from top to bottom and has good staggered joints. However, due to the addition of many processes - cleaning protection and cleaning work, the construction progress is slow and it is more difficult to ensure cleaning.
The construction method of laying checker bricks is as follows: checker bricks can be laid in sections, that is, according to the convenience of construction, they can be laid in two sections on the entire height of the heat storage chamber, that is, divided into upper and lower sections according to the height of the replacement handrail. After the first section of the main wall is built, all the cleaning and brick joint finishing work on the wall surface is completed, and the grate bricks are cleaned, and the row numbers of the grate bricks are checked once, and then the first layer of checker bricks is placed on the grate foot platform according to the designed position, and the expansion joints on the four sides and the staggered joint width between the checker bricks and the grate foot platform are checked. Make sure that the checker bricks can be firmly placed on the grate foot platform, and finally lay each layer of checker bricks from the center partition wall to both sides according to the designed position.
During construction, the checker bricks are placed on the brick pad. The hook of the checker brick is inserted into the hole of the checker brick to place the checker brick in the heat storage chamber. Then use a long wooden stick to adjust its position. When storing, it can be laid from the center to the furnace head in a stepped shape, or it can be laid layer by layer. The heat storage chamber sealing wall is built after the checker bricks of this section are laid.
After the first section of checker bricks is laid, the checker bricks are covered with a checker brick protection board to prevent waste such as mortar from falling into the checker bricks. Then continue to build the heat storage chamber wall. When it reaches the top of the heat storage chamber, lay the second section of checker bricks and build the second section of sealing wall.
