摘要
2012年6—10月,在我国北方某焦化厂厂界附近开展了O3、NO x、CO体积分数在线监测及VOCs样品采集分析工作,获得了夏、秋两季焦化厂厂界O3及其前体物的体积分数及其日变化趋势。焦化厂厂界附近O3、NO、CO体积分数均呈单峰型日变化,O3体积分数的季节差异不明显,夏季仅略高于秋季,而NO、CO体积分数秋季高于夏季,作为二次反应产物的NO2,其变化幅度秋季比夏季强烈。夏季TVOCs在各监测时段的小时体积分数呈现先上升后下降的日变化趋势,而秋季则呈现逐渐下降的日变化趋势。由较小VOCs/NO x的比值可初步判断,该焦化厂所在区域的大气光化学臭氧生成潜势处于VOCs控制区。在焦化厂下风向厂界附近,夏、秋两季TVOCs平均体积分数分别为（43.8±45.0）×10-9和（26.7±29.6）×10-9,苯系物、烷烃、烯烃的平均体积分数分别为（34.3±28.1）×10-9和（14.4±14.8）×10-9、（5.3±11.8）×10-9和（7.0±7.7）×10-9、（4.3±5.0）×10-9和（5.3±7.1）×10-9。夏、秋两季焦化厂附近臭氧生成潜势贡献最大的是苯系物（47.6%~65.8%）,其次是烯烃（28.0%~41.9%）,再次是烷烃（6.3%~10.5%）。
The concentrations of ozone（ O3）,nitrogen oxides（ NO x）,carbon monoxide（ CO） and volatile organic compounds（ VOCs） were monitored at the boundary of a coking factory in the northern China from June to October 2012. The monitoring data revealed that O3,NO,and CO showed a diurnal variation of single peak. The concentration of O3 was slightly higher in summer than that in autumn,while the concentrations of NO and CO was greatly lower in summer than those in autumn. In terms of NO2,its diurnal variation was much larger in autumn than that in summer. And for TVOCs,its hourly concentration increased firstly and then decreased in summer,while in autumn showed the continuous decrease trend. It can be concluded that this area was VOC-sensitive regime,due to the small ratio of VOCs/NO x. The concentrations of TVOCs were（ 43. 8 ± 45. 0） × 10- 9 in summer and（ 26. 7 ±29. 6） × 10- 9in autumn,in which the concentrations of aromatics,alkanes,alkenes were（ 34. 3 ± 28. 1） × 10- 9,（ 14. 4 ±14. 8） ×10- 9,（ 5. 3 ±11. 8） ×10- 9in summer and（ 7. 0 ± 7. 7） × 10- 9,（ 4. 3 ±5. 0） ×10- 9and（ 5. 3 ±7. 1） × 10- 9in autumn,respectively. The contributions of ozone formation potentials（ OFP） of aromatics,alkanes,alkenes were estimated to be 47. 6% ~ 65. 8%,28. 0% ~ 41. 9% and 6. 3% ~ 10. 5%,respectively.
出处
《环境工程学报》
CAS
CSCD
北大核心
2014年第3期1130-1138,共9页
Chinese Journal of Environmental Engineering
基金
环保公益性行业科研专项(201209003)
关键词
焦化厂
臭氧及其前体物
臭氧生成潜势
coking plant
ozone and its precursors
ozone formation potential
