CAJ | 학술논문

采用美国 EPA推荐的汞浓度现场测试OHM取样方法,对300,MW和600,MW两燃煤电厂静电除尘器(ESP)和湿法脱硫装置(WFGD)前后烟气进行等速取样,采用Hydra AA汞分析仪测试烟气各种形态的汞质量浓度.结果表明:燃煤电厂烟气汞排放占总汞排放 80%,以上;ESP 能有效脱除烟气中的颗粒汞,同时还能脱除部分元素汞;WFGD对烟气中氧化汞的脱除效率达90%,以上,但对元素汞的脱除效果非常有限,原因是脱硫过程存在气相和液相的还原反应,将Hg2+转化成Hg0,出口烟气Hg0含量增加,导致总汞脱除效率降低.
채용미국 EPA추천적홍농도현장측시OHM취양방법,대300,MW화600,MW량연매전엄정전제진기(ESP)화습법탈류장치(WFGD)전후연기진행등속취양,채용Hydra AA홍분석의측시연기각충형태적홍질량농도.결과표명:연매전엄연기홍배방점총홍배방 80%,이상;ESP 능유효탈제연기중적과립홍,동시환능탈제부분원소홍;WFGD대연기중양화홍적탈제효솔체90%,이상,단대원소홍적탈제효과비상유한,원인시탈류과정존재기상화액상적환원반응,장Hg2+전화성Hg0,출구연기Hg0함량증가,도치총홍탈제효솔강저.
The Ontario hydro method(OHM)was used to sample flue gas before and after electrostatic precipita-tor(ESP)and wet flue gas desulfurization(WFGD)in two power plants of 300,MW and 600,MW,and various mer-cury concentrations were analyzed by Hydra AA. The result shows that mercury emissions of flue gas phase account for more than 80%, of the total mercury emissions from coal-fired plants;particulate mercury in flue gas could be effectively removed by ESP,and part of elemental mercury could also be removed;WFGD could remove more than 90%, of oxide mercury in flue gas,but its ability to remove elemental mercury is very limited. The reason is that the reduction reaction of gas and liquid phase exists in desulfurization process,in which Hg2+ was converted into Hg0, and the content of elemental mercury in outlet flue gas increased,leading to the decreased total removal efficiency of mercury.