Quality Requirements for Checker Bricks in Coke Oven Regenerators

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.

Rongsheng Checker Bricks

Rongsheng Refractory Manufacturer, Regenerator Checker Brick, Magnesia Checker Brick. Contact Rongsheng for more information.

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.

How to Extend the Service Life of Checker Bricks used in Glass Melting Furnaces?

The Checker Brick body is the heat transfer part of the regenerator and the most important component of the regenerator structure. Whether the structure of the Checker Brick body is reasonable not only affects the service life of the regenerator but also directly affects the heat storage efficiency of the regenerator, which in turn affects the thermal efficiency of the entire furnace. Therefore, the refractory materials that make up the lattice body are required to be able to withstand high temperatures, resist corrosion, accumulate a lot of heat, transfer heat quickly, and have good thermal vibration stability. The entire Checker Brick body is required to have good structural stability.

Checker Brick with Good Structural Stability

The regenerator checker brick body that has been exposed to high-temperature flue gas for a long time is subject to periodic cooling and heating and is subject to erosion by flying materials and alkali vapor. The lattice holes can become clogged or damaged, causing the bricks to deform, crack, or even collapse. In the mild case, it will reduce the thermal efficiency of the melting furnace; in serious cases, it will directly affect the production and operation of the melting furnace. Therefore, regular observation and inspection of the Checker Brick is very necessary. The main contents of the inspection are:

① The state of melting, burning, swelling, cracking, and falling off of checker bricks.

② Check whether the Checker Bricks’ holes are blocked. If there is a blockage, the location, scope, and severity of the blockage need to be observed clearly.

③Whether the checker brick body has collapsed.

④ Check the slag accumulation condition in the regenerator and flue.

⑤ Check whether there is any air leakage in the regenerator and flue.

checker brick exposed to high-temp flue gas

Sodium silicate melting production requires stable temperature, kiln pressure, and normal feeding operations. However, it should be noted that regular removal of dust accumulation in the regenerator and flue is a necessary condition for stable operation.

The reversal of the furnace every 20 to 30 minutes changes the direction of the flame flow. While the regenerator checker bricks on one side are heated by high-temperature exhaust gas, cold air enters the regenerator Checker Bricks on the other side, causing the temperature of the Checker Brick to gradually decrease. The temperatures of the regenerator Checker Bricks on both sides show periodic crossovers. Only when the temperature curves of different cycles intersect are basically the same can the temperature be stabilized.

The slag accumulated in the Checker Brick holes should be removed regularly. Cleaning is done on the hot side. If there is a lot of slag accumulated and cannot be completely removed when the fire needs to be changed, the fire should be changed on time and then removed when the fire direction is changed. After removing the slag, a layer of quartz sand should be spread to prevent the dust slag from sticking to the flue pavement tiles.

 

RS Checker Bricks Manufacturer

There are several measures to extend the service life of Checker Bricks:

① The ascending Checker Brick bricks are made of alkaline refractory materials that are resistant to high temperatures and corrosion.

② Widen the furnace bar holes and purge them in time.

③Reasonably control the temperature of the regenerator to avoid excessive kiln pressure.

④ Reasonably arrange regular hot repairs.

⑤ Reduce powder flying.

⑥ Set long fire regularly, or use an oil gun to burn nodules, etc.

Therefore, in order to better extend the service life of the Checker Bricks used in glass melting furnaces, in addition to choosing high-quality refractory bricks when purchasing Checker Bricks. It is also necessary to carry out maintenance and repair during its use, so as to ensure the service life of the checkered bricks. This reduces the number of furnace shutdowns and furnace repairs.