Four common maintenance and dredging methods for glass kiln regenerator grids
The height of the top surface of the regenerator grid is usually 100~120mm higher than the glass liquid level, and the overall height is usually 8~9m to maximize the heat exchange efficiency of the grid and ensure that the air flow is relatively evenly distributed across the entire width of the grid. There are basically four methods for dredging the lattice body, namely the process dredging method, the manual slag breaking method, the special burning gun slag burning method and the lattice brick replacement method.
1. Process dredging method
The so-called process dredging method is to adjust the process system to increase the temperature of the grid body in the regenerator, so that the sulfate in the grid holes melts and flows to the sediment chamber at the bottom of the regenerator, thereby dredging the grid body. This operation method is suitable for the initial stage of grid blockage. The grid block has just begun to block, but it is not completely blocked yet.
Clear the regenerator grid when it is clogged.
When operating the process dredging method, first determine the blocked regenerator, install thermocouples in the parts that need to be monitored, and then improve the grid by increasing the opening of the flue gate or increasing the heat load or extending the flame or extending the flame change time. temperature, when the temperature of the grid body reaches above the melting point of sulfate, the sulfate blocked in the grid body will flow to the sludge chamber of the regenerator under the action of gravity, thereby clearing the grid body.
When using the process dredging method, attention should be paid to the possible impact on the quality of the glass. In addition, special attention should be paid to the temperature of the furnace bars to ensure the safety of the furnace bars and grids.
2. Manual slag poking method
The manual slag breaking method is a grid body in which the kiln worker uses a pointed steel pipe to loosen the sulfate or other debris blocked in the grid holes in the slag chamber of the regenerator and make it fall to the bottom of the heat storage rate. Unclogging method. This method is mostly used to clean blockages in the middle and lower parts of the regenerator and the flying material caps on the top of the grid.
In addition to special steel pipes, the tools used in the manual slag breaking method can also use orchid and bamboo chips. Because the orchid bamboo sheets have better toughness, they can better protect the checker bricks from being damaged by external forces, but their operation and production methods are more complicated than using steel pipes. Manual slag poking method to clear the regenerator lattice does not need to increase the temperature of the lattice body and is safer for the furnace bars. However, if the operation is improper, the lattice bricks may be damaged. In addition, it is also labor-intensive. This method It should be used sparingly, but if this method is combined with the process dredging method, the effect will be better.
3. Special burning gun slag burning method
The burning gun slag burning method is a method that uses a special burning gun to heat the slag in the grid holes, which is mainly sulfate, to the melting point, and then melts it and flows into the regenerator slag chamber, thereby clearing the grid body. There are three types of professional burning guns: natural gas guns, LPG air guns and diesel guns. Natural gas and LPG air guns have simple structures and are easy to control, while diesel guns have complex structures and are relatively difficult to control.
When using burner gun slag, the burner gun head can be made into several types. If there are grid burning holes reserved on the target wall, you can use an elbow burning gun to dredge them outside the regenerator. For furnaces without reserved holes, you can choose to open holes at the ash removal door. You can also choose to place the gun in the slag chamber to clear the grate holes on the grate. But no matter what kind of burner you use, you must pay attention to the flame temperature not being too high to avoid damaging the checker bricks. As the number of burns increases, the frequency of dredging will continue to increase, and the burns will become more difficult each time. In the later stages of the melting operation, more and more lattice holes will become dead holes in the periphery, and the slag burning method will play an increasingly smaller role.
In addition, when the grid body is seriously clogged, consider using a special hot air generator. Control the heating rate of the hot air generator to 10°C/min, monitor the temperature of the furnace bar to <1000°C, and the temperature of other grid body segmented parts should also be lower than the safe temperature. , thus raising the overall temperature of the regenerator, causing all the blockages that originally blocked the grid body to melt and flow down. The advantage of this method is that it has high dredging efficiency. It can clear the corners and corners that are difficult to deal with by other methods as well as the particularly thick and dense areas with blockages. The disadvantage is that the cost of dredging is high. Improper control during the dredging process may cause the local temperature of the grid to be too high and cause damage. If damaged, it may cause partial collapse of the grid after dredging.
What needs special reminder is that since the basic principle of the slag method is to forcefully melt sulfate at high temperature in a short time, it will inevitably cause the sulfate to decompose at high temperature and release S02 gas, thus causing a sharp increase in the S02 gas content in the flue gas. Taking a 500t/d ordinary natural gas float kiln as an example, if a single grid is dredged by the slag method, the S02 gas content in the flue gas can increase from <200mg/m3 under normal conditions to >1000mg/m3, so slag is used. Before this method, preparations for flue gas desulfurization must be made. In glass factories that have not built desulfurization equipment, it is not recommended to use this method to clear the grid.
4. Replacement of grid bricks
As the age of the kiln increases, the blockage of the grid body becomes more and more serious. The grid bricks themselves have been partially damaged due to the erosion of the furnace exhaust gas. In addition, the grid bricks are inevitably damaged when clearing the grid body. It is possible that the grid body has partially collapsed. In some furnaces with unreasonable design or substandard brick quality, large-scale collapse of a certain level of the grid may occur. At this time, the grid needs to be replaced.
Replacing checker bricks falls under the category of kiln hot repair. When replacing the checker bricks, use a water bag to block the hot air flow at the small furnace mouth, close the flue gate, and open the hot repair door. After the temperature of the checker body drops, the thermal repair personnel begin to replace the checker bricks. Replacing checkered bricks is difficult to operate and expensive to maintain, so they are generally not used until the end.
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