不同温度区间内污泥热解气固相产物特征_金湓

2014年6月 CIESC Journal ·2316·

June 2014第65卷 第6期 化 工 学 报 V ol.65 No.6

不同温度区间内污泥热解气固相产物特征

金湓1，

4，李宝霞2，金诚3

（1西北民族大学化工学院，甘肃 兰州 730000；2华侨大学化工学院, 福建 厦门361021；3兰州大学资源环境学院，甘肃

兰州 730000；4甘肃省高校环境友好复合材料及生物质利用省级重点实验室，甘肃 兰州 730000）

摘要：对城市污水污泥（简称污泥）进行工业分析和热重分析，考察污泥的基本组成和热重特性；采用气相色谱（GC ）检测了不同热解温度区间内污泥热解生成的气体产物成分，并利用SEM 和BET 分别分析了不同热解终温下裂解炭的形貌特征和比表面积。结果表明：污泥热解可以分为水分析出阶段、挥发分析出阶段和焦炭化阶段；不同热解温度区间内污泥热解气体产物的组成有很大差别，热解温度350℃后H 2在热解气中的含量快速增加，CH 4含量在350～450℃时达到最大值，而CO 主要在热解温度为350～750℃时生成，CO 2含量随着热解温度的增加迅速下降；随着热解终温的不断升高，裂解炭结构变得越来越疏松，比表面积也随之增大，750℃达到最大值55 m 2·g −1。

关键词：污泥；固定床热解；热解气体；裂解炭；温度区间 DOI ：10.3969/j.issn.0438-1157.2014.06.049

中图分类号：TK 6 文献标志码：A 文章编号：0438—1157（2014）06—2316—07

Characteristics of products from sewage sludge pyrolysis at various

temperature ranges

JIN Pen 1,4, LI Baoxia 2, JIN Cheng 3

(1College of Chemical Engineering and Technology , Northwest University for Nationalities , Lanzhou 730000, Gansu , China ;

2

College of Chemical Engineering and Technology , Huaqiao University , Xiamen 361021, Fujian , China ; 3College of Earth and

Environmental Sciences , Lanzhou University , Lanzhou 730000, China ；4Key Laboratory of Gansu Universities for Environmentally

Friendly Composites and Biomass Utilization , Lanzhou 730000, Gansu , China )

Abstract: Municipal sewage sludge (i.e . sludge) at various temperature ranges was analyzed by proximate analysis and thermogravimetric analysis methods. The gaseous components produced by the sludge pyrolysis were detected by gas chromatography (GC), while the morphology and specific surface area of pyrolytic char measured by SEM and BET techniques, respectively. The results show that the pyrolysis process of sludge can involve water evaporation, organics volatilization and char formation steps. There are obvious differences between the gas components obtained at different ranges of pyrolysis temperature. The H 2 content will rapidly increase when pyrolysis temperature is larger than 350℃， the maximum CH 4 content obtained when temperature is in 350—450℃, the temperature range generated CO is mainly in 350—750℃, and the CO 2 content declines for the whole range of pyrolysis temperature. With rising final temperature of pyrolysis, the char structure becomes more and

2013-07-30收到初稿，2013-12-22收到修改稿。

联系人：李宝霞。第一作者：金湓（1986—），男，硕士研究生。基金项目：中央高校基本科研业务费专项资金（JB-ZR1110）；福建省科技计划重点项目（2013Y0065）；泉州市科技计划重点项目（2013Z25）。

Received date : 2013-07-30.

Corresponding author : Prof. LI Baoxia, 357381937@ Foundation item : supported by the Basic Scientific Research Foundation of Central University (JB-ZR1110), Key Project of Science and Technology Plan of Fujian Province(2013Y0065) and Key Project of Science and Technology Plan of Quanzhou City(2013Z25).