我国14座生活垃圾焚烧厂飞灰的物化特性分析

对我国东北、华北、华东和华南地区14座城市生活垃圾焚烧厂的飞灰进行了组分、热灼减率和熔融特性分析。结果表明:我国炉排炉飞灰中CaO含量最高，其质量分数达到40%~60%；Cl含量次之，质量分数为20%~30%；同时富集大量易气化的重金属。飞灰的热灼减率随温度升高而显著增加，当温度达到1200℃以上时趋于稳定，最高可达40%以上。飞灰的流动温度受SiO₂的含量影响最显著，流动温度分布在1100~1500℃内。

COMPOSITION AND MELTING CHARACTERISTICS OF FLY ASH FROM 14 MSWI PLANTS IN CHINA

In this paper, the physicochemical properties of fly ash from 14 municipal solid waste incinerators located in Northeast, North, East and South China were analysed, including their composition, loss on ignition and melting characteristics. The results showed that the content of CaO in fly ash of grate furnace was the highest in China, and the mass fraction of CaO was 40%~60%. The content of Cl was in the range of 20%~30%. At the same time, considerable contents of heavy metals which are easy to gasify were enriched in the fly ash. The loss on ignition of fly ash increased significantly with the increase of incineration temperature. When the temperature was 1200℃ above, it tended to be stable, and the highest loss on ignition was 40% above. The flow temperature of fly ash was most significantly affected by the content of SiO₂, distributed in the range of 1100~1500℃.