气候变化领域集成服务门户(CCPortal): Heterogeneous reactions behaviors of pulverized coal MILD combustion under different injection conditions

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DOI	10.1016/j.fuel.2020.117925
	Heterogeneous reactions behaviors of pulverized coal MILD combustion under different injection conditions
	Zhang Z.; Lu B.; Zhao Z.; Zhang L.; Chen Y.; Luo C.; Zheng C.
发表日期	2020
ISSN	162361
卷号	275
英文摘要	The behaviors of heterogeneous reactions during pulverized coal MILD combustion was quite different from that during conventional mode, which made an unclear effect on char burnout and NOx emissions. The present works aimed to numerically study the behaviors of pulverized coal combustion under different injection conditions, i.e., velocity and temperature. Results showed that, compared with preheating temperature, the effects of jet velocity on char combustion behaviors were more significant. As the jet velocity increased, the region of char burnout shrank and overall average burnout rate weakened, also the share of char consumed by O2 gradually raised up and by gasified agents fell down. For all cases, char reacting with H2O and CO2 accounted for >28%, and the peak values of Dat were below 0.65. The ranges of Da,O2, Da,CO2 and Da,H2O were 0.5–1.0, 0.002–0.012 and 0.0004–0.003 implying the diffusion/kinetics-controlled for char-O2 reaction while diffusion-controlled for char-CO2 and char-H2O. The location of the inflection points that the kinetics effect shifted to diffusion effect moved toward upstream with the velocity and temperature increasing. Further low NOx emissions could be realized by enhancing gasification reaction that were depended on the operational conditions. © 2020 Elsevier Ltd
英文关键词	Heterogonous reactions; Injection condition; Low NOx emissions; Numerical simulation; Pulverized coal MILD combustion
scopus关键词	Carbon dioxide; Coal; Diffusion; Nitrogen oxides; Pulverized fuel; Velocity; Diffusion controlled; Gasification reaction; Heterogeneous reactions; Inflection points; Injection conditions; Operational conditions; Preheating temperature; Pulverized coal combustion; Coal combustion
来源期刊	Fuel
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176826
作者单位	State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
推荐引用方式 GB/T 7714	Zhang Z.,Lu B.,Zhao Z.,et al. Heterogeneous reactions behaviors of pulverized coal MILD combustion under different injection conditions[J],2020,275.
APA	Zhang Z..,Lu B..,Zhao Z..,Zhang L..,Chen Y..,...&Zheng C..(2020).Heterogeneous reactions behaviors of pulverized coal MILD combustion under different injection conditions.Fuel,275.
MLA	Zhang Z.,et al."Heterogeneous reactions behaviors of pulverized coal MILD combustion under different injection conditions".Fuel 275(2020).