垃圾衍生燃料流化床焚烧污染物排放特性

Experiment study on pollutant emission of RDF incineration in fluidized bed

为解决直接焚烧生活垃圾产生二次污染问题,将城市生活垃圾源头提质后制成RDF燃料,在流化床内焚烧以研究气态污染物排放特性。研究结果表明：RDF中随塑料比例增加,CO质量浓度减少,SO2质量浓度缓慢增加,当RDS燃料质量分数为35%时,SO2质量浓度趋于平缓,NO质量浓度先急剧升高,当RDF燃料质量分数为35%时,NO质量浓度趋于平缓;随床温升高,CO质量浓度明显降低而NO质量浓度增加,SO2质量浓度缓慢增长至850℃时基本不变;CO质量浓度随炉膛出口氧质量分数增大逐渐减少;SO2和NO质量浓度逐渐升高;随废石灰添加量增加,SO2的脱除效果较好,CO排放质量浓度呈略微减小的趋势,NO质量浓度增加显著。NOx,SO2和CO的质量浓度均远低于国家标准。最佳污染控制工况为：含25%~35%塑料RDF,床温为850℃,炉膛出口氧质量分数为11%,Ca O质量分数为5%。

In order to solve the garbage incineration which directly generates the secondary pollution, the gaseous pollutant emission incineration characteristics of RDF were studied made by source classified garbage in fluidized bed. The results show that with the increase of plastic proportion in the RDF components, CO mass concentration decreases and SO2 mass concentration increases slowly after leveling off and NO fiat after increased dramatically at 35% plastic content; when bed temperature is higher, CO emission decreases obviously, NO increases and SO2 mass concentration grows slowly and basically remains unchanged when the temperature is 850 ℃. Mass concentration of CO gradually decreases but mass concentration of SO/and NO increases with the increase of outlet oxygen concentration. SO2removal effect becomes good and CO emission mass concentration decreases slightly and NO mass concentration increases obviously with the increase of waste lime content. Mass concentrations of NOx, SO： and CO is far lower than the national standard values. The best condition of pollution control is RDF including 25%-35% plastic content, 850 ℃, 11% oxygen volume of outlet of the furnace, and adding amount of 5% CaO （mass fraction） under the experimental conditions.