MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, 710049 Shaanxi, China.
Bioresour Technol. 2013 Feb;129:642-5. doi: 10.1016/j.biortech.2012.12.065. Epub 2012 Dec 20.
Based on the ash-related problems during biomass combustion, the evolution of element S, Cl, K and chemical components and ash fusion characteristics of capsicum stalks, cotton stalks and wheat stalks ashed at 1000, 1200 and 1400 °C are further studied by XRF and XRD. Cl disappears at 815 °C in the form of HCl due to the aluminosilicate of sylvite. Above 1000 °C, inorganic S is released in the form of SO2 by the silicate of K2SO4, which is the main reason that ashing ratio decreases at high temperature. Except of the evaporation of KCl and K2SO4 aerosol which cause the release of K, Cl and S, K may be also reduced by the organic decomposition and the releases of metal K and KOH. The ash fusion characteristics of biomass are mainly dependent on the high-temperature molten material built up by quartz, potassium iron oxide and silicates.
基于生物质燃烧过程中的灰分相关问题，进一步通过 XRF 和 XRD 研究了在 1000、1200 和 1400°C 下辣椒秆、棉花秆和麦秆灰化时元素 S、Cl、K 的化学组成和灰熔融特性以及其演化情况。由于钾盐的铝硅酸盐，以 HCl 的形式在 815°C 时 Cl 消失。高于 1000°C 时，以 SO2 的形式由 K2SO4 的硅酸盐释放无机 S，这是高温下灰分率降低的主要原因。除了 KCl 和 K2SO4 气溶胶的蒸发导致 K、Cl 和 S 的释放之外，K 可能还会由于有机分解和金属 K 和 KOH 的释放而被还原。生物质的灰熔融特性主要取决于由石英、氧化铁钾和硅酸盐构成的高温熔融物质。
