State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
Department of Chemical and Material Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Waste Manag. 2024 Jun 15;182:21-31. doi: 10.1016/j.wasman.2024.04.025. Epub 2024 Apr 16.
This research investigates the formation mechanism of soot and particulate matter during the pyrolysis and gasification of waste derived from Municipal Solid Waste (MSW) in a laboratory scale drop tube furnace. Compared with CO gasification atmosphere, more ultrafine particles (PM, aerodynamic diameter less than 0.2 μm) were generated in N atmosphere at 1200℃, which were mainly composed of polycyclic aromatic hydrocarbons (PAHs), graphitic carbonaceous soot and volatile alkali salts. High reaction temperatures promote the formation of hydrocarbon gaseous products and their conversion to PAHs, which ultimately leads to the formation of soot particles. The soot particles generated by waste derived from MSW pyrolysis and gasification both have high specific surface area and well-developed pore structure. Compared with pyrolysis, the soot generated by gasification of waste derived from MSW had smaller size and higher proportion of inorganic components. The higher pyrolysis temperature led to the collapse of the mesoporous structure of submicron particles, resulting in a decrease in total pore volume and an increase in specific surface area. Innovatively, this research provides an explanation for the effect of reaction temperature/ CO on the formation pathways and physicochemical properties of soot and fine particulate matter.
本研究在实验室规模的下降管炉中，调查了城市固体废物（MSW）衍生废物在热解和气化过程中形成烟尘和颗粒物的机制。与 CO 气化气氛相比，在 1200℃的 N 气氛下生成了更多的超细颗粒（PM，空气动力学直径小于 0.2μm），主要由多环芳烃（PAHs）、石墨状碳质烟尘和挥发性碱盐组成。较高的反应温度促进了烃类气态产物的形成及其向 PAHs 的转化，最终导致了烟尘颗粒的形成。MSW 热解和气化衍生废物生成的烟尘颗粒均具有高比表面积和发达的孔结构。与热解相比，MSW 气化衍生废物生成的烟尘颗粒尺寸更小，无机成分比例更高。较高的热解温度导致亚微米颗粒的中孔结构坍塌，总孔体积减少，比表面积增加。本研究创新性地解释了反应温度/CO 对烟尘和细颗粒物形成途径及物理化学性质的影响。
