Principles for selecting refractory materials for graphitization furnaces
1. Thermal performance: It has high thermal conductivity and thermal stability at high temperatures, and can effectively maintain the temperature of high-temperature gases and reduce heat loss. At the same time, the refractory material is required to have good corrosion resistance and be able to resist the erosion of chemical substances in the high-temperature gas of the graphitization furnace.
2. Chemical stability: Refractories materials should be able to resist the erosion of chemical substances in the high-temperature gas of the graphitization furnace to avoid performance degradation or damage due to chemical reactions. For different types of graphitization furnaces, appropriate refractory fire materials should be selected according to specific conditions.
3. Mechanical strength: Refractory materials should have sufficient mechanical strength to cope with the impact and vibration of the graphitization furnace. At the same time, it is necessary to ensure that the refractory fire materials do not peel or break during use to ensure the safety of their use.
4. Constructability: The selected refractory materials should have good constructability and be easy to carry out operations such as masonry, filling and jointing. During the construction process, damage and destruction to the original lining should be minimized. At the same time, its dimensional stability and high-temperature deformation performance must be considered to deal with deformation problems in high-temperature use environments.
Construction of refractory fire materials for graphitization furnace
1. Preparation before construction: Clean the graphitization furnace, remove surface impurities and pollutants, and keep it dry. Understand the size, shape and specifications of the refractory bricks of the graphitization furnace, and prepare the required tools and materials.
2. Laying the bottom lining: Choose appropriate refractory materials fire bricks to lay at the bottom of the graphitization furnace. They must be flat and stable, and leave a certain expansion joint to cope with the expansion of the refractory bricks at high temperatures.
3. Masonry lining: According to the shape and size of the graphitization furnace, select appropriate refractory bricks for laying. The brick joints are required to be tight and have no open joints. During the masonry process, the brick surface must be kept flat, and appropriate refractory mud should be used for filling and jointing.
4. Top sealing: Use refractory bricks and refractory mud to seal the holes reserved on the top of the graphitization furnace to prevent air and fuel gas from entering the furnace.
5. Baking and debugging: After completing the construction, bake the graphitization furnace, check the compactness and overall stability of the refractory brick lining, and make necessary adjustments.
