Characteristics of Volatile Organic Compounds Emitted from Biomass-pellets fired Boilers
Characteristics of Volatile Organic Compounds Emitted from Biomass-pellets fired Boilers
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DOI：
10.13227/j.hjkx.201611209
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发表时间：
2017-06-15
期刊：
影响因子：
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通讯作者：
Yang Li-hui
中科院分区：
文献类型：
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作者：
Wu Chang-da;Zhang Chun-lin;Yang Li-hui
本研究使用预浓缩器 - 气相色谱 - 质谱联用仪/氢火焰离子化检测仪（pre - concentrator - GC - MS/FID）对五台生物质颗粒燃料锅炉排放的烟气中挥发性有机化合物（VOCs）的特性进行了研究。同时还测量了颗粒物、氮氧化物（NOx）、二氧化硫（SO₂）以及汞及其化合物的浓度。结果表明，五台锅炉排放的SO₂以及汞及其化合物的浓度相对较低，低于国家排放标准，而部分锅炉排放的NOx和颗粒物高于标准。56种VOC物质的质量浓度范围为（872.43 ± 293.80） - （6929.66 ± 1137.25）μg·m⁻³，影响因素分析表明，炉膛温度和负荷与总VOCs浓度呈强负相关。VOCs的排放成分主要由烯烃（41% - 59%）组成，包括乙烯、1 - 丁烯、顺 - 2 - 丁烯和1 - 己烯；烷烃（27% - 49%）包括己烷、异戊烷和环戊烷；芳烃（6% - 18%）包括苯和甲苯。此外，采用最大增量反应活性（MIR）方法分析了VOCs的臭氧生成潜势（OFP）。五台锅炉的OFP贡献主要来自烯烃，占比相对较高，为76% - 90%，烷烃的贡献范围为6% - 19%。
A pre-concentrator-GC-MS/FID was used to investigate the characteristics of volatile organic compounds (VOCs) based on the flue gases emitted from five biomass-pellets-fired boilers in this study. And the concentrations of particle matter, nitrogen oxides (NON), sulfur dioxides (SO2) and mercury and its compounds were also measured. Results demonstrated that the concentrations of SO2 and mercury and its compounds emitted from all five boilers were relatively low, which were lower than the national emission standard, while NO and particles from some boilers were higher than the standard. The mass concentration of 56 VOC species was in the range of (872.43 +/- 293.80)-( 6 929.66 +/- 1 137.25) mu g.m(-3), and the analysis of influencing factors implied that the furnace temperatures and loads havd strong negative correlations with the concentration of total VOCs. The emission components of VOCs were mainly composed of alkenes (41%-59%) including ethylene, 1-butene, cis-2-butene and 1-hexene; alkanes (27%-49%) including hexane, isopentane and cyclopentane; and aromatics (6%-18%) including benzene and toluene. Moreover, the maximum incremental reactivity (MIR) method was applied to analyze ozone formation potential (OFP) of VOCs. The contribution of OFP of five boilers was mainly from alkenes, occupying a relatively high percentage of 76%-90%, and that of alkanes was in the range of 6% to 19%.