Emission characteristics and formation mechanisms of PM2.5 and gases from different geological maturities coals combustion

doi:10.1016/j.fuel.2022.123240

IEECAS OpenIR > 粉尘与环境研究室

	Emission characteristics and formation mechanisms of PM2.5 and gases from different geological maturities coals combustion
	Zhang, Bin 1; Shen, Zhenxing 1,2,4; Sun, Jian 1; Zou, Haijiang 1; He, Kun 1; Wang, Xin 3; Li, Jianjun 2; Cui, Song 4; Zhang, Ningning 2; Cao, Junji 2
通讯作者	Shen, Zhenxing(zxshen@mail.xjtu.edu.cn)
	2022-05-01
发表期刊	FUEL
ISSN	0016-2361
卷号	315 页码:10
摘要	To evaluate the influence of geological maturity on coal combustion pollutant emissions, six chunk coals and corresponding briquettes (volatile matter [VM] content from 8.0% to 39.9%) were selected for simulated residential combustion in a carefully designed chamber, and the formation mechanism involved was investigated. VM was revealed to have a nonlinear effect on the emission factors (EFs) of particulate matter with an aerodynamic diameter of <2.5 mu m (PM2.5), polycyclic aromatic hydrocarbons (PAHs), elemental carbon (EC), and organic carbon (OC), with the highest EFs observed in VM of 15.8% and 26.8%. Coal tar yield and air-supply from VM combustion in its initial stage was found to be a key factor influencing PM2.5 and PAH emissions when compared with the char combustion and burnout stages. The highest PM2.5 and PAH EFs were observed in coal with 15.8% VM. Additionally, significant amounts of hydrogen cyanide (HCN) were detected at stage 1 and were released as volatile-N through the pyrolysis of coal-N. N2O and NOx were also emitted through homogeneous gas-phase HCN reactions. However, only a small proportion of NOx was produced, indicating that the contribution of VM to HCN and N2O emissions is greater than that of NOx. In the char reaction stage (stage 2), char-N reacted with O-2 to form large amounts of NO, and the reaction length of the entire coal combustion process exhibited a positive relationship with coal maturity (correlation coefficient 0.69, p < 0.05), suggesting that the contribution of NO from char-N to overall NO emissions increased with the coal's geological maturity due to the increase in coal-N retention in char. Furthermore, coal briquetting was found to decrease the EFs of pollutants, which may be explained by an increase in MCE (modified combustion efficiency) and the conversion from coal tar to carbon and hydrogen. This study elucidated the effects of geological maturity on pollutant emissions from coal combustion and examined relevant underlying mechanism. These data can serve as the foundation for a clean coal project in China or other counties concerned with coal combustion emissions.
关键词	Briquette coal Chunk coal Geological maturity Volatile matter Emission factors Formation mechanism
DOI	10.1016/j.fuel.2022.123240
关键词[WOS]	POLYCYCLIC AROMATIC-HYDROCARBONS ; RESIDENTIAL COAL ; CARBONACEOUS PARTICLES ; ELEMENTAL CARBON ; RANK-DEPENDENCE ; PAH EMISSIONS ; STOVES ; WOOD ; AIR ; REDUCTION
收录类别	SCI ; SCI
语种	英语
资助项目	National Key R&D Program of China[2017YFC0212205] ; National Natural Science Foundation of China[41877404] ; SKLLQG, the Chinese Academy of Sciences[SKLLQG1919]
WOS研究方向	Energy & Fuels ; Engineering
项目资助者	National Key R&D Program of China ; National Natural Science Foundation of China ; SKLLQG, the Chinese Academy of Sciences
WOS类目	Energy & Fuels ; Engineering, Chemical
WOS记录号	WOS:000747392200005
出版者	ELSEVIER SCI LTD
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/17401
专题	粉尘与环境研究室
通讯作者	Shen, Zhenxing
作者单位	1.Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China 2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710049, Peoples R China 3.Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA 4.Northeast Agr Univ, Int Joint Res Ctr Persistent Tox Subst IJRC PTS, Sch Water Conservancy & Civil Engn, Harbin, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Bin,Shen, Zhenxing,Sun, Jian,et al. Emission characteristics and formation mechanisms of PM2.5 and gases from different geological maturities coals combustion[J]. FUEL,2022,315:10.
APA	Zhang, Bin.,Shen, Zhenxing.,Sun, Jian.,Zou, Haijiang.,He, Kun.,...&Cao, Junji.(2022).Emission characteristics and formation mechanisms of PM2.5 and gases from different geological maturities coals combustion.FUEL,315,10.
MLA	Zhang, Bin,et al."Emission characteristics and formation mechanisms of PM2.5 and gases from different geological maturities coals combustion".FUEL 315(2022):10.