The Development Status and Research Trend of Key Service Materials for Waste Incinerators
The disposal of municipal waste has almost become one of the most serious urban problems faced by governments all over the world. As an important treatment means, incineration can not only achieve the purpose of reducing capacity and weight, but also realize the cascade utilization of energy and maximize the benefit of garbage resources. As a key equipment in the process of waste incineration, the physicochemical characteristics of waste, incineration temperature, flue gas composition and other factors in the process of use will have a certain impact on the life of the key service materials of waste incineration. Therefore, the research and development of key service materials with high temperature resistance, corrosion resistance and long life is the key to ensure the normal and orderly operation of waste incinerator and safe production. Typical key service materials of waste incinerator mainly include refractory materials, metal tube wall coating materials, flue gas treatment materials, etc. In recent years, with the development of garbage incinerators towards large scale and automation, it is difficult for the existing ordinary refractories to meet the requirements of the fire resistance of waste incinerators. Therefore, the selection of refractory materials for waste incinerators has put forward higher special requirements. At present, the research of refractories for incinerators mainly focuses on the development of corrosion resistance of chromium-containing refractories and the development of chromium-free refractories represented by silicon carbide. In view of the serious corrosion of waste incineration fly ash on the metal tube wall of incinerators, researchers and enterprises are actively developing anti-corrosive coating protective materials, such as surfacing coating protective materials, thermal spraying protective materials and laser cladding protective materials. The harmless disposal of flue gas is also a key issue in the research of key service materials for waste incineration. The current research mainly focuses on the development of catalyst materials for flue gas de-N and de-S, the development of dust removal filter materials for flue gas treatment, especially the longevity design of new fiber materials with high temperature and corrosion resistance. In this paper, according to the types and characteristics of waste incinerators, the research progress of typical key service materials of waste incinerators, such as refractory materials, metal tube wall coating materials and flue gas treatment materials, were summarized systematically. The existing problems and the future development trends of typical key service materials of waste incinerators were also summarized and proposed, respectively, which could provide a valuable reference for further popularization and application of typical key service materials of waste incinerators in China.
