After a long period of high-temperature operation, the refractory brick lining and various equipment used in the glass melting furnace have shown varying degrees of aging. In particular, the checker bricks in the regenerator are seriously damaged, resulting in blockage, which seriously affects the atmosphere in the glass melting furnace. This situation not only increases energy consumption, but also causes a large number of quality problems in the produced glass products. Therefore, thermal repair of the checker bricks is the most effective way so far.
PART.01 Reasons for damage to the checker bricks in the regenerator
The main function of the checker bricks in the regenerator is to recover a large amount of waste heat taken away during the glass melting process, thereby improving heat utilization and reducing energy consumption.
The melting furnace achieves effective utilization of energy through periodic fire replacement. In this process, the checker bricks repeatedly absorb and release heat, and their temperature rises and falls accordingly, resulting in periodic fluctuations in the temperature of the checker bricks. In addition, the long-term erosion of high temperature, smoke and alkaline volatile gases has aggravated the blockage, aging and damage of the checker bricks.
PART.02 Thermal repair process of checker bricks in heat storage chamber
1. Preparation for thermal repair
Before thermal repair, a specific thermal repair plan should be formulated. Equipment, tools and checker bricks should be ready for use. During the thermal repair, the ratio of raw and clinker materials should be adjusted, the pulling amount and the pressure in the kiln should be controlled, and the temperature should be controlled to ensure the normal production needs of the melting furnace.
2. Replacement of checker bricks
After opening the heat storage chamber, the old checker bricks that have been damaged inside should be cleaned first. When removing the old checker bricks, special attention should be paid. As the heat storage capacity gradually decreases and the working conditions in the kiln change, the fire should be manually controlled according to the situation, and timely adjustments should be made to ensure the hot spot temperature and melting.
Stack new checker bricks. The material of the checker bricks in the heat storage chamber is the same as the original heat storage chamber checker body structure, mainly using clay bricks, magnesia-chrome bricks and high-purity magnesia bricks. Stack clay bricks, magnesia-chrome bricks and high-purity magnesia bricks from bottom to top. Seal the heat storage chamber door and remove the water tank. Seal the water tank door.
After the checker bricks in the heat storage chamber are replaced and the door is sealed, it is very important to perform reasonable heating operations and monitor the temperature in the heat storage chamber. During the entire heating process, the principle of "slow heating and no cooling" should be followed.
PART.03 Effect of thermal repair of checker bricks in the heat storage chamber
After the thermal repair of checker bricks in the heat storage chamber, the heat in the heat storage chamber is stable and the heat energy consumption is reduced. Glass defects and plate explosion time caused by material problems have been greatly reduced, and fuel consumption has also been reduced.
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