贵州地区大气汞污染及湿法脱硫装置除汞效果的初步评价
An investigation of atmospheric Hg concentration and the removal of Hg by desulfurizing in flue gas of coal fired power plants in Guizhou area
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摘要: 2004年冬季在贵州地区对大气中气态元素汞进行了大范围的流动监测调查,重点监测电厂分布地区及东部汞采冶加工地区,结果表明,气态元素汞浓度的高值出现在汞化工区和金矿区;在广大农村地区和小县城附近,大气汞浓度大都在100 ng/m3范围内。同期还进行了大气颗粒物汞的采样和分析,结果表明,监测到的大气颗粒物的汞浓度水平<3ng/m3,与国内其他一些城市相当;细颗粒物中汞的富集度高,粒径<2.2μm的颗粒物汞占60%~80%。此外,实测了采用石灰-石膏法脱硫电厂的燃煤汞平衡,评价了汞去除效果,结果表明,燃煤中的汞大约20%留在灰渣中,石灰-石膏脱去约20%,约59%的汞通过烟气排放到空气中。Abstract: The monitoring of gaseous elemental mercury (Hg0) concentrations was conducted at Guizhou area,especially around coal fired power plants and mercury mining areas,in the winter of 2004.Results showed that enhanced concentrations of Hg0 were found around factories of mercury and gold productions and about 100ng/m3 in county and rural areas.Measurements of particulate mercury (Hgp) in atmosphere were performed at corresponding period.Concentrations of Hgp were less than 3 ng/m3,which was comparable to what found at other cities in China.Mercury mainly accumulated in fine particles and about 60% to 80% of Hgp distributed less than 2.2 μm particles.Experiment was conducted at coal fired power plants to assess the balance and removal efficiency of mercury.Results showed that about 20% of mercury remained sediment dust and about 59% emitted to air,and about 20% were removed by gehpsum.
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Key words:
- atmospheric mercury /
- wet desulfurization /
- removal efficiency of mercury
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