Emission characteristics of carbonyl compounds emitted from biomass-fired-boilers
SHEN Li-ran1, ZHANG Chun-lin1, WU Chang-da1, WANG Bo-guang1,2, BAI Li3, YANG Li-hui3, HUANG Jiang-rong3, Liu Jun3
1. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511436, China;
2. Research Center on Low-carbon Economy for Guangzhou Region, Guangzhou 510632, China;
3. Guangdong Environmental Monitoring Center, Guangzhou 510308, China
To characterize the carbonyl emission from biomass-fired boilers, air samples collected from six typical biomass-fired boilers were analyzed by a PFPH-GC/MS method to determine 21carbonyl species. The results showed that distinctive emission characteristics of carbonyl compounds for each boiler. In general, hexanaldehyde and propionaldehyde were the most abundant carbonyl compounds with a percentage of 29%~47% and 19%~31% in the total carbonyls, respectively, followed by formaldehyde and acetone; otherwise, acetaldehyde and nonanal. The emission factors of carbonyl compounds were calculated with the total amount of emission and the mass ration of consumed fuels. It found that the emission factors of carbonyl compounds ranged from 3.06 to 18.29mg/kg (with an average of 9.45±6.05mg/kg). The calculated Maximum Increment Reactivity (MIR) was utilized to assess the atmospheric chemical reactivity and the Ozone Formation Potential (OFP) of emissions from the biomass-fired boilers. The average of OFP (in O3) was 5.97gO3/gVOCs, and the three largest contributors among the measured carbonyl compounds were hexanaldehyde, propionaldehyde and formaldehyde. Although acetone had a high mass concentration, it only gave a relatively low contribution to ozone formation.
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