添加木质素对污泥热解过程氮转化的影响

doi:10.11949/j.issn.0438-1157.20161324

化工学报 ›› 2017, Vol. 68 ›› Issue (4): 1590-1599.DOI: 10.11949/j.issn.0438-1157.20161324

添加木质素对污泥热解过程氮转化的影响

郭明山^1,2, 金晶¹, 刘敦禹¹, 李尚¹, 王永贞¹, 沈洪浩¹

1 上海理工大学能源与动力工程学院, 上海 200093;
2 中国船舶重工集团公司第七一一研究所, 上海 200090

收稿日期:2016-09-21 修回日期:2016-11-28 出版日期:2017-04-05 发布日期:2017-04-05
通讯作者: 金晶
基金资助:
上海市基础研究重点项目（14JC1404800）。

Effect of lignin on nitrogen transformation during pyrolysis of sewage sludge

GUO Mingshan^1,2, JIN Jing¹, LIU Dunyu¹, LI Shang¹, WANG Yongzhen¹, SHEN Honghao¹

1 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 Shanghai Marine Diesel Engine Research Institute, Shanghai 200090, China

Received:2016-09-21 Revised:2016-11-28 Online:2017-04-05 Published:2017-04-05
Supported by:
supported by the Key Project in Fundamental Research of Science and Technology Commission of Shanghai Municipality (14JC1404800).

摘要/Abstract

摘要：

利用热重-质谱联用仪（TG-MS（在线检测添加不同比例木质素的污泥热解和主要含氮气体释放特性，并利用傅里叶红外光谱仪（FTIR（在线检测热解过程固体残焦表面官能团的变化规律，分析木质素对污泥热解过程氮转化的影响，从而揭示氮的迁移机理。结果表明：污泥热解过程NH₃的生成主要来自蛋白质的脱氨作用，加入木质素后热解过程中产生了大量羰基，抑制了氨基酸的分子内环化和分子间缩聚反应，而促进了直链酰胺的生成，最终在OH自由基攻击下转化成HNCO和HCN；NH₃的增加并非来自HCN和OH的反应，而是由未缩合的氨基脱除生成；另外，添加40%左右的木质素对于减少污泥热解过程中NO_x前驱物的排放有积极意义。

关键词: 城市污泥, 有机化合物, 热解, 木质素, 氮迁移

Abstract:

The release of gaseous nitrogen compounds during pyrolysis of municipal sludge was analyzed by a combination of thermogravimetric analysis (TG) and mass spectrometry (MS) with the emphasis on lignin addition on the pyrolysis. Moreover, the dynamic change of functional groups on coke surface was detected online by Fourier-transform spectrometer (FTIR) to reveal the nitrogen migration mechanism. Results showed that NH₃ came primarily from protein deamination reaction. Lignin addition produced substantial carbonyl that reacted with the amino of protein, thus promoting the generation of linear amide that would generate HCN and HNCO when attacked by OH radicals. The amino not condensed would convert to NH₃ as temperature increased. Overall, 40% of the lignin addition had positive effects on reducing emission of NO_x precursor.

Key words: municipal sludge, organic compounds, pyrolysis, lignin, nitrogen transformation

中图分类号:

TK16

郭明山, 金晶, 刘敦禹, 李尚, 王永贞, 沈洪浩. 添加木质素对污泥热解过程氮转化的影响[J]. 化工学报, 2017, 68(4): 1590-1599.

GUO Mingshan, JIN Jing, LIU Dunyu, LI Shang, WANG Yongzhen, SHEN Honghao. Effect of lignin on nitrogen transformation during pyrolysis of sewage sludge[J]. CIESC Journal, 2017, 68(4): 1590-1599.

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添加木质素对污泥热解过程氮转化的影响

Effect of lignin on nitrogen transformation during pyrolysis of sewage sludge

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