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浙江大学学报(工学版)
浙江大学学报(工学版)
动力与能源工程     
污泥掺混褐煤水热制固体燃料的理化特性
李建, 刘猛, 段钰锋, 许超
东南大学 能源热转换及其过程测控教育部重点实验室,江苏 南京 210096
Physicochemical analysis on hydrothermal upgrading of sewage sludge with lignite for solid fuel
LI Jian, LIU Meng, DUAN Yu feng, XU Chao
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
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摘要：
为了解决污泥单独水热碳化灰分高、热值和资源化利用率低等问题,通过水热处理的方法对城市污泥掺混低阶褐煤进行提质处理,对水热提质固体燃料的燃料特性、孔隙结构以及化学结构的变化等理化特性进行研究.结果表明,当污泥与褐煤质量添加比为1∶9时,随着水热温度的提高,固体燃料中碳含量以及热值大幅度提高,且原子个数比n(H)/n(C)和n(O)/n(C)显著下降.固体燃料羟基或羧基官能团中—OH和酰胺官能团或羧基官能团中—CO的相对光谱吸收强度显著降低,表明提质过程中污泥与褐煤发生了显著的脱水和脱羧反应.通过13C核磁共振波谱分析,发现随着提质温度的升高,甲氧基减少的速率最快,摩尔分数从5.76%减少到了1.31%,羧基和羰基的摩尔分数从9.03%减少到5.64%,说明固体燃料中氧元素的丢失不仅与脱水作用有关,与羰基和羧基的转化以及甲氧基的变化也密切相关；芳香化碳的摩尔分数显著增加,表明固体燃料的芳香化程度加深,煤质特性提升.
Abstract:
Hydrothermal treatment of municipal sewage sludge with low rank lignite was conducted in order to solve the problems of high ash content, low resource utilization rate and calorific value of sewage sludge hydrothermal carbonization. The physicochemical characteristics of the solid fuel,including fuel characteristics, pore structure and the changes of chemical structure were analyzed. Results show that the carbon content and calorific value of the solid fuel greatly promoted and the atomic ratio of n(H)/n(C) and n(O)/n(C) significantly descend with the temperature increasing when the quality ratio of sewage sludge and lignite is 1∶9. Relative absorption intensity of —OH in hydroxyl or carboxyl groups and —CO in amide or carboxyl groups were significantly reduced, indicating that dehydration and decarboxylation reactions occurred during the upgrading process. The 13C NMR spectrum showed that the relative content of methoxyl carbons and carboxyl/carbonyl groups diminished from 5.76% to 1.31% and 9.03% to5.64%, respectively, which suggested that oxygen loss not only corresponds to dewatering, but a significant correlation with conversion of CO and COOH and change of methoxyl carbons. The relative content of aromatic carbon was greatly improved, which indicated that the degree of aromatization and coalification deepened.
出版日期: 2016-02-01
:  TK 16  
基金资助:

国家自然科学基金资助项目51206028)；国家”973”重点基础研究发展计划资助项目(2010CB227001)；中国博士后科学基金面上及特别资助项目(2012M520971，2013T60491).
通讯作者: 刘猛，男，博士、讲师.ORCID：0000 0002 6316 3769.     E-mail: lmubear@seu.edu.cn
作者简介: 李建（1991—)，男，硕士生，从事固体废弃物的资源化利用.ORCID：0000 0001 5942 8974.E-mail: dawnjacll@sina.cn
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李建, 刘猛, 段钰锋, 许超. 污泥掺混褐煤水热制固体燃料的理化特性[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2016.02.018.

LI Jian, LIU Meng, DUAN Yu feng, XU Chao. Physicochemical analysis on hydrothermal upgrading of sewage sludge with lignite for solid fuel. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2016.02.018.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2016.02.018    或    http://www.zjujournals.com/eng/CN/Y2016/V50/I2/327

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