Requirements for refractories for large solid waste incinerators
Solid waste incineration technology is widely used because of its advantages of large treatment capacity, good reduction, thorough harmlessness and energy utilization. However, in the process of waste incineration, due to the high temperature in the incinerator and the amount of corrosive gas contained in the waste, it will have a serious erosive effect on the refractory materials of the incinerator, which will affect the service life and operational stability of the incinerator. Therefore, for the selection of refractory materials for large-scale solid waste incinerators, it is necessary to fully consider the performance requirements such as high temperature resistance, corrosion resistance, thermal shock resistance and slag resistance.
1. High temperature resistance.
In solid waste incinerators, the primary performance requirement for refractories is to be able to withstand high temperatures. Typically, the temperature inside the incinerator can reach 850 1100 or even higher. Therefore, refractories must have a high melting point and thermal stability, and be able to maintain their properties at high temperatures. For example, materials such as kaolin bricks and mullite bricks are widely used in the lining of large solid waste incinerators because of their high melting point and good thermal stability.
2. Corrosion resistance.
The refractory material in the solid waste incinerator must also have excellent corrosion resistance. In a high-temperature environment, the corrosive gases in the waste (such as sulfides, chlorides, etc.) will react chemically with the refractory materials and cause corrosion. Therefore, when selecting refractory materials, it is necessary to fully consider their chemical compatibility with various corrosive gases to prolong the service life of the incinerator. For example, alumina-containing refractories are widely used due to their good corrosion resistance to hydrogen sulfide gas.
3. Thermal shock resistance During the working process of the solid waste incinerator, the internal temperature of the solid waste incinerator will continue to change, resulting in repeated thermal shock of the refractory material. Therefore, refractories must have good thermal shock resistance to avoid cracking, spalling and other phenomena caused by thermal shock. In order to improve the thermal shock resistance of refractories, special processes can be used, such as prestressing refractories or testing and evaluation of thermal shock resistance. Fourth, slag resistance performanceA large number of slag substances will be produced during the incineration of solid waste, which will cause serious erosion to the refractory materials of the incinerator. Therefore, refractories must have excellent slag resistance to resist the erosive effects of slag substances. In order to improve the slag resistance of refractory materials, materials with good slag resistance can be used, such as mullite, corundum, etc. At the same time, the structural design of the incinerator can also be optimized to reduce the direct contact and scouring of slag substances on the refractory materials. 5. Economy and environmental protectionIn addition to the above performance requirements, the refractory materials of large-scale solid waste incinerators also need to be economical and environmentally friendly. In terms of economy, the cost and life cycle cost of refractory materials should be fully considered when selecting them, so as to maximize economic benefits. In terms of environmental protection, priority should be given to low-pollution, renewable or recyclable refractories to reduce the impact on the environment. At the same time, the implementation of environmental protection measures should also be strengthened in the production and construction of refractories to achieve sustainable development goals. To sum up, the requirements for refractories for large-scale solid waste incinerators involve many aspects, including high temperature resistance, corrosion resistance, thermal shock resistance, slag resistance, economy and environmental protection. In order to ensure the safe and stable operation of the incinerator and extend its service life, it is essential to select the right refractory materials. In the future, with the continuous progress of technology and the continuous improvement of application requirements, the requirements for refractory materials for solid waste incinerators will also be more stringent and diversified. Therefore, relevant enterprises and research institutions should strengthen the research and development and application research of new refractory materials to meet the growing demand and environmental protection requirements of solid waste incinerators.