Evolution of nitrogen functionalities in relation to NOx precursors during low-temperature pyrolysis of biowastes

doi:10.1016/j.fuel.2018.01.049

	Evolution of nitrogen functionalities in relation to NOx precursors during low-temperature pyrolysis of biowastes
	Zhan, Hao 1,2; Zhuang, Xiuzheng 1,2; Song, Yanpei 1,2; Huang, Yanqin 2; Liu, Huacai 2; Yin, Xiuli 2; Wu, Chuangzhi 2
刊名	FUEL
	2018-04-15
卷号	218 页码:325-334
关键词	Biowastes Nitrogen functionalities Thermal stabilities Low-temperature pyrolysis NH3-N Nitrogen removal
ISSN号	0016-2361
DOI	10.1016/j.fuel.2018.01.049
通讯作者	Wu, Chuangzhi(wucz@ms.giec.ac.cn)
英文摘要	Nitrogen functionalities in biowastes appear to differ in species and thermal stabilities due to various nitrogen origins. Their evolution at primary pyrolysis is essential to the formation of NOx precursors while the relevant mechanisms and characteristics on this haven't been clearly elucidated. Low-temperature pyrolysis of two biowaste categories involving agricultural ones (bean straw, BS; rice straw, RS; and wheat straw, WS) and industrial ones (medium-density fiberboard waste, MFW; penicillin mycelia waste, PMW; and sewage sludge, SS) were conducted to investigate evolution characteristics and pathways of nitrogen functionalities in relation to NOx precursors. Results demonstrated that N-A with various types (amino-N/amide-N/amine-N) together with N-IN (inorganic-N) were main nitrogen functionalities in two raw categories with a sequential thermal stability of N-IN (PMW, SS) < N-A (MFW) < N-A (PMW, SS) < N-A (agricultural ones), determining their evolution pathways. Subsequently, some of NH3-N was initially formed through decomposition of N-IN which was vanished at 250-300 degrees C. Furthermore, the majority of NH3-N was continuously produced by deamination of labile N-A and subsequent amine-N in tars. Simultaneously, their weak dehydrogenation would form a little HCN-N (< 2.5 wt%). Two heterocyclic-N in chars were found to be firstly formed by stable N-A and then converted into quaternary-N together with some NH3-N. Hence, NH3-N was the more dominant species with a sequential yield of industrial ones'' agricultural ones. Accordingly, due to the most thermally unstable nitrogen functionalities in industrial biowastes, suitable low-temperature pyrolysis (250-300 degrees C) was found to be an excellent pretreatment technique for them to realize an effective nitrogen removal at a small cost of energy loss (e.g. 63% for MFW and 31% for PMW within 25% energy loss).
资助项目	National Natural Science Foundation of China[51676195] ; National Natural Science Foundation of China[51661145022] ; Special Program for Key Basic Research of the Natural Science Foundation of Guangdong Province[2017B030308002]
WOS关键词	INDUSTRIAL BIOMASS WASTES ; SEWAGE-SLUDGE PYROLYSIS ; N2O PRECURSORS ; TG-FTIR ; CO-PYROLYSIS ; CONVERSION ; NH3 ; HCN ; RESIDUE ; TRANSFORMATION
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000429415500034
资助机构	National Natural Science Foundation of China ; Special Program for Key Basic Research of the Natural Science Foundation of Guangdong Province
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/23171]
专题	中国科学院广州能源研究所
通讯作者	Wu, Chuangzhi
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangdong Prov Key Lab New & Renewable Energy Res, Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Zhan, Hao,Zhuang, Xiuzheng,Song, Yanpei,et al. Evolution of nitrogen functionalities in relation to NOx precursors during low-temperature pyrolysis of biowastes[J]. FUEL,2018,218:325-334.
APA	Zhan, Hao.,Zhuang, Xiuzheng.,Song, Yanpei.,Huang, Yanqin.,Liu, Huacai.,...&Wu, Chuangzhi.(2018).Evolution of nitrogen functionalities in relation to NOx precursors during low-temperature pyrolysis of biowastes.FUEL,218,325-334.
MLA	Zhan, Hao,et al."Evolution of nitrogen functionalities in relation to NOx precursors during low-temperature pyrolysis of biowastes".FUEL 218(2018):325-334.