污泥化学链燃烧过程中氮迁移转化特性研究

摘要

在单流化床反应器上探究了污泥化学链燃烧过程中氮迁移转化特性.由于赤铁矿载氧体反应活性低,采用30%水泥对其改性.结果表明,水泥改性可提高污泥热解气化反应速率以及赤铁矿还原反应速率,进而提高污泥碳转化率,但是NO生成率也增加.随着反应温度的升高,污泥的碳转化率和NO生成率均增加.另外,随着水蒸气浓度的增加,碳转化率增加,同时可降低NO生成.在污泥化学链燃烧过程中,NO生成率为0.286%-0.768%,低于污泥空气焚烧氮氧化物排放量.%The experiments were conducted in a bench-scale fluidized-bed reactor. To improve the reactivity of hematite, cement was added. The results show that cement-modified hematite possessed a higher reactivity, leading to an increase in carbon conversion of sewage sludge. Nevertheless, the NO emission also increased as compared to hematite alone. The rise of fuel reactor temperature can intensify both carbon conversion and NO emission. Meanwhile, the rise of steam content can increase carbon conversion and decrease NO emission. Approximately 0. 286%-0. 768% of nitrogen measured was NO, which is lower than the value in sewage sludge air incineration process.