燃煤过程中Na对微细颗粒物生成特性的影响--合成焦炭法

Effect of sodium on the formation of fine particulates during synthetic char combustion

以合成焦炭为载体,研究不同种类的钠元素在煤粉燃烧过程中对微细颗粒物生成特性的影响,并通过向载体中添加煤中常见的矿物元素的氧化物(SiO_2、Al_2O_3),反映煤粉燃烧过程中钠与煤中常规矿物的相互作用。结果表明,无机水溶性钠更容易生成稳定的亚微米颗粒物;在缺少氯元素的情况下,有机态钠更容易与煤中的超微米硅铝矿物反应;化学反应和物理捕捉是硅铝矿物捕捉钠元素的两种方式,其中,对于PM1-10的硅铝矿物颗粒,化学反应固定的钠含量是物理捕捉过程的2.4倍。

Synthetic char was used as the mineral carrier to study the characteristic of fine particulates formation during coal combustion. The silica oxide and aluminum oxide were added to synthetic char to study the interaction between sodium and common minerals in coal. The results show that the inorganic water-soluble sodium is more likely to form stable fine particles,while organic sodium is preferred to react with silica and aluminum compounds in the absence of chlorine. Chemical reactions and physical capture are two main ways for sodium capture by silica,aluminum compounds. The sodium captured through chemical reactions is 2.4 times that by physical way.