烧结烟气超细颗粒物排放规律及其物化特性

The rules of super fine particulate emission from sintering flue gas and its physicochemical properties

将烧结过程分为6个阶段：点火段、中间1～3段（点火结束至烟气温度升温前）和升温1～2段（烟气温度开始上升至达到最高温）。研究各阶段超细颗粒污染物排放规律及物化特性发现：点火段、中间1段、中间2段的超细颗粒污染物质量浓度较低，在接近升温的中间3段浓度明显升高，在升温1段浓度达到最大值，但在升温2段浓度又有所下降，呈现出超细颗粒物在中间3段和升温1段集中排放的规律；点火段及中间段颗粒物主要由Fe、Ca、Al、si组成，升温1段颗粒物中F、Na、s、K、Pb含量明显高于其它阶段，升温2段颗粒物Al、si含量明显升高；点火段和中间段颗粒物形貌以规则亚微米级别Fe—rich球形颗粒及片状为主，升温1段产生的颗粒物有较为明显的熔融痕迹，还包括少量立方体KCl类型的颗粒物，升温2段以细小片状Al—Si—rich颗粒物为主。

The sintering process is divided into 6 sections ：ignition section, middle section 1 - 3 （ end of ignition to flue gas temperature rise）and temperature rise section 1 -2（ start of flue gas temperature rise to the maximum temperature）. The follow- ings are found in the research of super fine particulate emission rules and its physicochemical properties： The concentration of su- per fine grained pollutants in ignition section, middle section 1 and middle section 2 is low, the concentration of those near the middle section 3 of temperature rise obviously increases and the concentration of those in the temperature rise section 1 reaches the maximum, then the concentration of those in temperature rise section 2 decreases somewhat, showing the central emission rules of super fine particulates in middle section 3 and temperature rise section 1 ;The particulates in ignition section and middle sec- tion consist of Fe,Ca, A1,Si ,the F ,Na,S, K, and Pb content are obviously higher than those in other section, and the AI and Si content in the temperature rise section 2 rise obviously;The morphology of ignition section and middle section particulates is mainly of regular submicron level Fe-rich sphere grains and flakes, the particulates produced in temperature rise section 1 has ob- vious melting trace,including small amount of cubic KCL particulates. The particulates in temperature rise section 2 are of fine flaky Al-Si-rich particles.