典型厨余垃圾燃烧超细颗粒物生成演化规律  

Formation and Evolution of Ultrafine Particulate Matter from Typical Food Waste Combustion

作　　者：成明锴 陈晟 徐明厚[1] Cheng Mingkai;Chen Sheng;Xu Minghou(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China;State Key laboratory of Coal Conversion,Chinese Academy of Sciences,Taiyuan 030001,China)

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074 [2]中国科学院煤转化国家重点实验室,太原030001

出　　处：《燃烧科学与技术》2022年第6期694-700,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(52036003);煤转化国家重点实验室开放课题基金资助项目(J22-23-302).

摘　　要：采用平焰燃烧器研究典型厨余垃圾燃烧过程中超细颗粒物的生成及演化规律.挥发分燃烧阶段,火焰前侧以焦油热解裂解生成的碳烟颗粒为主,后侧则以矿物气化-凝结形成4.6~8.7 nm的硅酸盐颗粒为主,且颗粒平均粒径随着采样高度增加呈现先减小再增大的变化规律,体现出超细颗粒物生成过程中成核和聚并行为的竞争.在焦炭燃烧阶段,出现了大量10 nm级别固态方形颗粒,EDS结果显示颗粒为碱金属氯化物.由于蒸发以及硅酸化反应作用,此类颗粒平均粒径随着采样高度的提升不断减小.基于上述发现,揭示了典型厨余垃圾燃烧过程,以及碳烟演化、矿物气化-凝结及气流吹携等多种机制在内的超细颗粒物生成途径.In this paper,a flat-flame burner is used to study the generation of ultrafine particulate matter from typical food waste combustion.In the devolatilization stage,the soot generated by tar cracking is observed in the flame,while the nanoscale silicate particles with the diameter of 4.6—8.7 nm formed by the condensation of mineral vapor exist in the tail plume.The mean diameter of silicate particles decreases firstly and then increases again with the increase of sampling height,which reflects the competition of nucleation and coagulation in the formation of ultrafine particles.In the char burning stage,a large number of solid chloride cubic particles with the size of 10 nm are observed,which are alkali chloride particles.The size of cubic particles decreases with the increase of sampling height due to the melting,evaporation and silicification of alkali chloride.Finally,a picture of ultrafine particulate matter formation,including soot evolution,mineral gasification-condensation and gas carrying pathways,during the waste incineration is established.

关 键 词：厨余垃圾 垃圾焚烧 超细颗粒物 碱金属 热泳采样 

分 类 号：TK11[动力工程及工程热物理—热能工程]