The graphitization furnace is a high-temperature graphitization equipment in the production process of carbon products, and its refractory lining can withstand high temperature, chemical corrosion and mechanical stress to protect the service life of the graphitization furnace.
Principles for the selection of refractories for graphitization furnaces
1. Thermal performance:That is, it has high thermal conductivity and thermal stability at high temperatures, which 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 erosion resistance and resist the erosion of chemicals in the high-temperature gas of the graphitization furnace.
2. Chemical stability:The refractory material should be able to resist the aggressive effect of chemicals in the high-temperature gas of the graphitization furnace and avoid degradation or damage to the performance due to chemical reactions. For different types of graphitization furnaces, it is necessary to choose the appropriate refractory material according to the specific situation.
3. Mechanical strength:The refractory material should have sufficient mechanical strength to cope with the shock and vibration of the graphitizing furnace. At the same time, it is necessary to ensure that the refractory material does not peel off and break during use, so as to ensure the safety of its use.
4. Constructability:The selection of refractory materials should have good workability and be easy to carry out operations such as masonry, filling and jointing. During the construction process, it is necessary to minimize the damage and damage to the original lining. At the same time, its dimensional stability and high-temperature deformation performance should be considered to cope with the deformation problem in the high-temperature use environment.
Construction of refractory materials for graphitization furnaces
1. Pre-construction preparation:The graphitizing furnace is cleaned to remove surface impurities and contaminants and keep it dry. Learn about the size, shape and specifications of the graphitization furnace and the specifications of the refractory bricks, and prepare the tools and materials you need.
2. Laying the bottom liner:Select the appropriate refractory bricks to lay at the bottom of the graphitization furnace, which is required to be smooth and stable, and leave a certain expansion joint to cope with the expansion of the refractory bricks at high temperature.
3. Masonry lining:According to the shape and size of the graphitization furnace, select the appropriate refractory bricks for masonry. It is required that the brick joints are tight and there are no through joints, and the brick surface should be kept flat during the masonry process, and suitable refractory mud should be used for filling and hooking.
4. Top sealing:In the holes reserved at the top of the graphitization furnace, refractory bricks and refractory mud are used to seal to prevent air and fuel gases from entering the furnace.
5. Baking and debugging:After the completion of construction, the graphitization furnace is baked, the compactness and overall stability of the lining refractory bricks are checked, and the necessary adjustments are made.
Maintenance of refractories for graphitization furnaces
1. Daily inspection:The graphitization furnace should be inspected every day, including refractory brick lining, baking facilities, safety facilities, etc., to ensure that it is in good condition.
2. Regular maintenance:A comprehensive inspection and maintenance of the graphitization furnace is carried out quarterly or semi-annually, including checking the integrity of the refractory brick lining, cleaning the residue and ash accumulation inside the graphitization furnace, etc.
3. Replace refractory bricksWhen it is found that the lining of refractory bricks is seriously damaged or aged, it should be replaced in time. When replacing, it is necessary to select suitable refractory bricks, operate in strict accordance with the construction requirements, and pay attention to protecting the original lining from damage.
4. Cleaning and descalingThe graphitization furnace is cleaned and descaled regularly to remove the dirt and corrosion products on the surface and maintain its good thermal performance and service life.
In addition to the choice of refractory materials, it is also necessary to take into account the structural design of the graphitization furnace lining. Generally speaking, the lining of the graphitization furnace needs to have good thermal insulation performance and sealing performance to ensure the stability of the temperature and atmosphere in the furnace. At the same time, the furnace lining also needs to have a certain strength and stability to withstand the pressure and impact forces generated during the graphitization process.
In a word, the graphitization furnace needs to choose refractory materials with high temperature, wear resistance, corrosion resistance, thermal shock resistance, heat preservation and sealing performance to ensure safety, stability and efficiency in the graphitization process.
We have a complete solution for the design, production and project construction of refractories for graphitization furnaces and a number of domestic project cases. If you have any questions about graphitization furnaces or refractory needs, please feel free to contact us.