污水污泥高温热解残渣孔隙结构特性分析  

The pore structure properties of wet sewage sludge residues during a high-temperature pyrolysis

作　　者：郑小艳[1] 胡艳军[1] 严密[1] 任建莉[1] 钟英杰[1] 孟晟[1] 

机构地区：[1]浙江工业大学能源与动力工程研究所,浙江杭州310014

出　　处：《浙江工业大学学报》2015年第2期202-206,共5页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(51406182);浙江省建设科研和推广项目专项(20132026)

摘　　要：采用管式炉开展了不同含水量污水污泥高温热解制取残渣试验,通过ASAP 2020型物理吸附仪测定了污泥热解残渣的比表面积及孔隙结构特征,阐明了水的质量分数对污泥热解残渣微观孔隙结构的影响.研究显示：高温热解促使固相物质的孔隙结构充分发展,尤以2-10nm的中孔相对数量增加显著,3.75nm左右的孔隙所占比例出现峰值,热解残渣的孔容和BET比表面积显著增加;污泥中水的质量分数增加,污泥残渣的孔径分布更加均匀,中孔范围内的较大孔（〉10nm）增多,则其残渣作为中孔范围内吸附剂可能性越大;BET比表面积、孔容、微孔比表面积和孔容均呈现先减小后增大再减小的过程.The influence of different moisture content of sewage sludge on the micro-pore structure of pyrolysis residues was investigated. Pyrolysis residue samples were prepared through the experiments of sludge pyrolysis in a lab-scale tube furnace. The mico-pore structures of the various residues were characterized by ASAP 2020 physisorption analyzer. The results showed that the pore structure was fully developed by the high-temperature pyrolysis process, especially for a significant increased amount of the pores with a diameter from 2 nm to 10 nm. And the total amount of 3.75 nm of pores reached the maximum proportion. In addition, as moisture content increased, BET surface area and pore volume increased obviously. As the moisture content increased, the more uniform the pore size distribution of pyrolysis residue was, and the number of larger pores （2〉10 nm） in the range of medium pores increased much more,which means that a higher moisture content of sewage sludge resulted in a larger potential for the pyrolysis residue to be reused as mesoporous adsorbent. And BET surface area, pore volume, micro-pore surface area and volume decreased firstly and then increased and decreased finally.

关 键 词：污水污泥 含水量 热解 孔隙结构 比表面积 

分 类 号：TK63[动力工程及工程热物理—生物能]