Integrated assessment of volatile organic compounds from industrial biomass boilers in China: emission characteristics, influencing factors and ozone formation potential [post]

Ruidan Shi, Zibing Yuan, leifeng yang, Daojian Huang, Hui Ma
2022 unpublished
Industrial biomass boilers (IBBs) are widely promoted in China as a type of clean energy. However, they emit large amount of volatile organic compounds (VOCs) and the emission characteristics and the underlying factors are largely unknown due to the sampling difficulties. In this study, three wood pellet-fueled and two wood residue-fueled IBBs were selected to investigate the characteristics of VOCs emissions and to discover their underlying impacting factors. The emission factor of VOCs varied
more » ... from 21.6 ± 2.8 mg/kg to 286.2 ± 10.8 mg/kg for the IBBs. Oxygenated VOCs (OVOCs) were the largest group, contributing to 30.3%-73.6% of the VOCs emissions. Significant differences were revealed in the VOCs source profiles between wood pellet-fueled and wood residue-fueled IBBs. Operating load, excess air, furnace temperature and fuel type were identified as the primary factors influencing VOCs emissions. The excess air coefficient should be limited below 3.5, roughly corresponding to the operating load of 62% and furnace temperature of 630 °C, to effectively reduce VOCs emissions. VOCs emissions also showed great differences in different combustion phases, with the ignition phase having much greater VOCs emissions than the stable combustion and the ember phases. The ozone formation potential (OFP) ranged from 4.3 mg/m3 to 31.2 mg/m3 for the IBBs, and the wood residue-fueled IBBs yielded higher OFP than the wood pellet-fueled ones. This study underscored the importance of OVOCs in IBB emissions, and reducing OVOCs emissions should be prioritized in formulating control measures to mitigate their impacts on the atmospheric environment and human health.
doi:10.21203/ fatcat:oee2a62wcvctrcnhg2aw2xucny