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J4  2011, Vol. 45 Issue (11): 2020-2025    DOI: 10.3785/j.issn.1008-973X.2011.11.022
    
The experimental study of combustion and NOx emission
characteristics of Guizhou anthracite
CHEN Yao-ji, ZHOU Zhi-jun, ZHOU Ning, YANG Wei-juan,
LIU Jian-zhong, ZHOU Jun-hu, CEN Ke-fa
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, Zhejiang Province, China
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Abstract  

Influence of oxygen concentration and temperature on combustion and NOx emission characteristics of Guizhou anthracite was investigated in a subsiding furnace, adopting pulverized coal of 58-75 μm. Discharge amount of NOx increases with increasing of oxygen concentration, and the rate of increase decreases when excess air ratio is above 0.9; the raise of temperature increases discharge amount of NOx, and above 1 400 ℃, the rate of increase becomes bigger due to large amount of thermal NOx formation; NOx formation before 0.2 s and after 2.0 s of combustion is sensitive to oxygen concentration, which has less influence to NOx formation in main combustion section (0.2-2.0 s). Oxygen concentration is the key factor to NOx emission and combustion of Guizhou anthracite, but fuel-NOx is not sensitive to temperature.



Published: 08 December 2011
CLC:  TK 16  
Cite this article:

CHEN Yao-ji, ZHOU Zhi-jun, ZHOU Ning, YANG Wei-juan, LIU Jian-zhong, ZHOU Jun-hu. The experimental study of combustion and NOx emission
characteristics of Guizhou anthracite. J4, 2011, 45(11): 2020-2025.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2011.11.022     OR     https://www.zjujournals.com/eng/Y2011/V45/I11/2020


贵州无烟煤的燃烧特性和NOx排放特性试验

为了探究氧量及温度对贵州无烟煤的燃烧特性及NOx排放特性的影响,选用粒径为58~75 μm的贵州无烟煤,利用一维沉降炉进行相关试验.研究结果发现,贵州无烟煤NOx排放量随着氧气量的增加而增加,当过量空气系数大于0.9后增幅趋缓;随着燃烧温度的上升,NOx生成量增加,在达到1 400 ℃后,由于生成大量热力型NOx,NOx排放量呈指数型大幅增长;氧量主要影响贵州无烟煤在燃烧过程的0.2 s之前以及2.0 s之后的NOx生成量,对于0.2~2.0 s的主燃烧区域的NOx生成量影响不大.研究认为氧量是影响贵州无烟煤NOx排放及燃烧的最主要因素,燃料型NOx对温度并不十分敏感.

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