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SCI

论文标题    Inhibiting the formation of PM0.4 by optimizing the distribution of excess air coefficient in preheating combustion of lignite
作者    Ruan, Renhui; Jia, Shiyao; Yang, Minghui; Wang, Xiaoxiao; Yang, Wenjun; Wang, Xuebin; Tan, Houzhang
发表/完成日期    2023-05-19
期刊名称    ATMOSPHERIC POLLUTION RESEARCH
期卷    14
相关文章   
论文简介    Preheating combustion can effectively reduce NOx concentration, but the formation characteristics of PM0.4 in preheating combustion is unclear. In this study, the emission of PM0.4 in preheating combustion was reduced by optimizing the distribution of excess air coefficient. The mass-based particle size distribution (MPSD) of PM10, mass yield of PM0.4, elemental compositions and morphologies of PM, and the number-based particle size dis-tribution (NPSD) were analyzed to discuss the effect of alpha p on PM formation. The results showed that in pre-heating combustion, with an increase of alpha p, the mass yield of PM0.4 first decreased and then increased. The mass yield of PM0.4 is minimum when alpha p is 0.6. Preheating combustion can simultaneously reduce PM0.4 mass yield and NOx concentration. The relationship between NOx concentration and alpha p is similar to the relationship be-tween the mass yield of PM0.4 and alpha p. The MPSD of PM0.4 is multimodal and unimodal when alpha p is less than 1 and larger than 1, respectively. Particle volume concentration of PM0.4 indicates that the multimodal and unimodal of PM0.4 is a result of evolution of particles with different characteristics of gas-to-particle transformation. The effect of alpha p on the transformation of inorganic element from coal particles to PM0.4 is S > Fe approximate to Ca approximate to Mg > Na > Si. alpha p affects the mass yield of PM0.4 by affecting the combustion intensity of coal/char particles in preheating furnace and combustion furnace. When alpha p is 0.6, the combustion intensity of coal particles in preheating furnace and combustion furnace minimize the vaporization of inorganic elements.
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