The formation and emission of ash particles in biomass combustion is one of the most intractable challenges in the biomass-firing utility boilers. In present study, field measurements of PM₁₀ at the inlets and outlets of the baghouse equipped on a 50 MW biomass-firing CFB boiler were carried out. The results showed that PM₁₀ generated from the combustion of the biomass fuels in the CFB boiler exhibited a uni-modal size distribution. The sole modal peak (appeared at 5 μm) in the PSD curve was located in the size range >1 μm, while there was no visible peak in the size range <1 μm. The coarse PM mainly exhibited rough and angular surfaces with elements Ca, Si and Al as the principal constituents. The mass concentrations of PM₁, PM_2.5 and PM₁₀ after the bagshouse were reduced to 0.95, 5.58 and 25.70 mg/Nm³ respectively, corresponding to the capture efficiencies of 97.80%, 98.52% and 98.64%. Moreover, the PM capture efficiency was observed to decrease with decreasing particle size in PM_0.2. More Cl migrated into the fine PM when passing through the baghouse. Further comparisons revealed that the mass ratios of PM₁ in PM₁₀ in the flyash generated in the CFB boilers were <10%, which was much lower than that in the grate boilers firing biomass (40–80%), which is beneficial to PM removal in the dust removers and reduce the final PM emission during biomass combustion.

在生物质燃烧公用锅炉中，生物质燃烧中灰烬颗粒的形成和排放是最棘手的挑战之一。在本研究中，对装有50兆瓦生物质燃CFB锅炉的布袋除尘器的进出口进行了PM _10的现场测量。结果表明，CFB锅炉中生物质燃料燃烧产生的PM ₁₀表现出单峰尺寸分布。PSD曲线中的唯一模态峰（出现在5μm处）位于> 1μm的尺寸范围内，而在<1μm的尺寸范围内没有可见的峰。粗PM主要表现出以Ca，Si和Al为主要成分的粗糙且有角的表面。PM ₁，PM _2.5的质量浓度袋滤室后的PM和PM ₁₀分别降低至0.95、5.58和25.70 mg / Nm ^3，分别对应于97.80％，98.52％和98.64％的捕获效率。此外，观察到PM捕获效率随着PM _0.2中颗粒尺寸的减小而降低。穿过布袋除尘器时，更多的Cl迁移到细粉中。进一步的比较表明，CFB锅炉产生的粉煤灰中PM ₁₀中PM ₁的质量比＜10％，远低于燃烧生物质的g式锅炉（40-80％），这有利于PM去除除尘器并减少生物质燃烧过程中最终的PM排放。