特定污泥干化过程中二恶英抑制气体排放特性  

Dioxin suppression gases emission characteristics during particular sludge drying process

作　　者：陈彤[1] 詹明秀[1] 林晓青[1] 李晓东[1] 陆胜勇[1] 严建华[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室、热能工程研究所,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2015年第2期322-329,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家“863”高技术研究发展计划基金资助项目(2012AA062803); 浙江大学基本科研业务费专项资金资助项目(2012QNA4089)

摘　　要：为了研究污泥干化过程中SO2、NH3、HCN等抑制二恶英生成的气体的排放特性,将干污泥放置于管式炉中加热干化,利用烟气分析仪Gasmet测量污泥干化过程中SO2、NH3和HCN等二恶英抑制气体及CO、NO2等其他常规污染物的排放浓度.研究干化温度、干化气氛、污泥种类对二恶英抑制气体排放的影响.试验结果表明,2g上海干污泥在300ml/min纯氮气氛中干化时,50min内二恶英抑制气体SO2、NH3和HCN的平均排放速率分别为680,1570,110mg/（m3·s）.干化温度越高,抑制气体排放越迅速,但持续时间越短;纯氮气氛中干化有利于NH3的排放,模拟烟气中有利于SO2的排放;含硫或含氮丰富的污泥有利于产生更多的抑制气体.考虑到NH3和HCN的排放特性,θ=300~350℃为合适的干化温度.通过比较发现,间断式升温能够最大程度地保证污泥干化过程中二恶英抑制气氛的排放,工业应用中应注意余热烟气和污泥输送逆向布置,保证污泥干化气的持续排放,适合规模化应用.In order to study the emission characteristic of dioxin suppression gases, including SO2, NH3, HCN, during sludge drying process, Gasmet was used to measure the concentration of these gases and other normal pollutants, including CO and NO2, when sludge was dried in the small-scale tube furnace. Moreover, the influences of drying temperature, type of sludge and drying atmosphere on the emission characteristics of dioxin suppression gases were also studied. The results show that the emission rates of SO2, NHa and HCN were about 680, 1 570, 110 mg/（ma · s） when sludge （2 g）was heated for 50 min under N2. Furthermore, the results also reveal that the higher drying temperature was set, the shorter the emission time lasted; More NHa generate under N2 atmosphere, but turning to SO2 under the simulated flue gas atmosphere; high N or S content of sludge generates moredioxin suppression gases in the some cases. Considering the emission characteristics of NH3 and HCN, 0 = 300~350 ℃ was chosen as the proper drying temperature. It＇s good for dioxin suppression gases emission by intermittent heating, and it＇s needed to pay attention to the reverse arrangement of sludge conveying and flue gas flowing in the industrial application to generate continuous suppression gases. We believe it is also available in a large- scale application after parameters modification.

关 键 词：污泥干化气 二恶英 抑制 排放特性 

分 类 号：X705[环境科学与工程—环境工程]