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贵阳市燃煤烟气中汞在大气中传输的数值模拟

吕晓彤 李启泰 蒋维楣

吕晓彤, 李启泰, 蒋维楣. 贵阳市燃煤烟气中汞在大气中传输的数值模拟[J]. 环境科学研究, 2010, 23(5): 560-569.
引用本文: 吕晓彤, 李启泰, 蒋维楣. 贵阳市燃煤烟气中汞在大气中传输的数值模拟[J]. 环境科学研究, 2010, 23(5): 560-569.
LV Xiao-tong, LI Qi-tai, JIANG Wei-mei. Numerical Simulation of Mercury Transport and Sensitivity of Flue Gas from Coal Burning in Guiyang City[J]. Research of Environmental Sciences, 2010, 23(5): 560-569.
Citation: LV Xiao-tong, LI Qi-tai, JIANG Wei-mei. Numerical Simulation of Mercury Transport and Sensitivity of Flue Gas from Coal Burning in Guiyang City[J]. Research of Environmental Sciences, 2010, 23(5): 560-569.

贵阳市燃煤烟气中汞在大气中传输的数值模拟

基金项目: 国家自然科学基金项目(50166001);贵州省科学技术基金项目〔黔科合计 字(2001)1212〕;贵州省省长基金项目

Numerical Simulation of Mercury Transport and Sensitivity of Flue Gas from Coal Burning in Guiyang City

  • 摘要: 利用中尺度非静力大气化学模式(MESO-NHC),以及目前大气中臭氧(O3)和氢氧基(OH)对汞氧化的研究成果,研究贵阳市原煤燃烧产生的大气汞传输,以及φ(大气汞)对Hg0的干沉积速率,OH与元素汞(Hg0)的反应率常数的敏感性. 结果表明:①模拟区内实际大气中φ(Hg0)为局地人为排放源和自然排放源共同作用的结果,二者所占比例大致相当. ②由于化学和沉积特性不同,φ(Hg0),φ〔Hg(Ⅱ)〕和φ(HgP)随着与排放源距离增加而衰减的程度存在差异,排放源对附近地区φ(大气汞)及各种形态汞所占比例影响较大;在远离排放源的地方,大气中的Hg(Ⅱ)和HgP主要来自于Hg0不断的氧化作用. ③φ(大气汞)表现出2种不同的垂直分布特征,在一定高度以下φ(Hg0)随高度线性递减,而在该高度之上直到对流层顶φ(Hg0)几乎保持同样的数值;φ〔Hg(Ⅱ)〕和φ(HgP)随高度的变化遵循指数递减规律. φ(Hg0)随高度和与排放源距离增加而衰减的程度不及φ〔Hg(Ⅱ)〕和φ(HgP),主要是由于Hg0通过化学反应和沉积而离开大气的量少,能较充分通过平流扩散和垂直输送作用输送到离排放源较远和较高的地方. ④排放源附近φ(大气汞)较高的地方φ(大气汞)对Hg0的干沉积速率敏感性较高,而φ(大气汞)较低的地方其敏感性较低. ⑤φ(大气汞)对Hg0被OH氧化的反应率常数(k)的变化普遍很敏感,在较大的反应率常数kHg-OH3.55×10-14×e294/T情况下,Hg0所占比例偏低,而Hg(Ⅱ)和HgP所占比例偏高,与监测结果偏差较大;在kHg-OH2.94×10-14情况下模拟结果更为合理.

     

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  • 收稿日期:  2010-01-11
  • 修回日期:  2010-03-05
  • 刊出日期:  2010-05-25

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