Abstract Aiming to reduce the emission of particulate matter (PM) during biomass combustion, we investigated the effects of pyrolysis temperature and feedstock type on the chemical properties of biochar and PM emission characteristics during subsequent combustion. Wood- and manure-based char samples were prepared at pyrolysis temperatures ranging from 200 to 500 °C and combusted in a laboratory-scale tube furnace at 850 °C. Due to the removal of volatile matter (VM), the total PM emission factor (EF) of the wood char decreased with increasing pyrolysis temperature, becoming negligible with pyrolysis at temperatures over 400 °C. For manure char, although pyrolysis removed VM and reduced the total PM EF from 12.5 ± 2.7 to 5.8 ± 2.9 mg/g-fuel, the high ash content precluded any effect on the emission of ash-derived PM. The occurrence of ash-derived PM resulted from release of Na, Mg, K, and Ca and was enhanced at higher combustion temperatures. We demonstrated that the pyrolysis of low-ash biomass effectively reduces the risk of PM emission. However, the efficacy of thermal treatment of high-ash biomass is limited but might be improved with further treatment, such as ash removal.

中文翻译：

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热解温度和原料类型对生物炭燃烧过程中颗粒物排放特性的影响

摘要 为了减少生物质燃烧过程中颗粒物（PM）的排放，我们研究了热解温度和原料类型对生物质炭化学性质和后续燃烧过程中颗粒物排放特性的影响。在 200 至 500 °C 的热解温度下制备基于木材和粪便的炭样品，并在实验室规模的管式炉中在 850 °C 下燃烧。由于挥发性物质（VM）的去除，木炭的总 PM 排放因子（EF）随着热解温度的升高而降低，在超过 400°C 的温度下热解变得可以忽略不计。对于粪便炭，虽然热解去除了 VM 并将总 PM EF 从 12.5 ± 2.7 降低到 5.8 ± 2.9 mg/g-燃料，但高灰分含量排除了对灰分 PM 排放的任何影响。灰分 PM 的出现是由于 Na、Mg、K 和 Ca 的释放，并在较高的燃烧温度下增强。我们证明了低灰分生物质的热解有效地降低了 PM 排放的风险。然而，对高灰分生物质进行热处理的功效是有限的，但可以通过进一步的处理（如除灰）来提高。