CAJ | 학술논문

零价汞的高效去除是燃煤烟气汞污染控制过程中的关键环节.为了促进烟气中的零价汞转化为易于去除的氧化态汞,分别考察了在有HCl存在时,几种过渡金属氧化物(Cu、Fe、Mn、Co和Zr)对零价汞氧化的催化作用,以筛选出性能较好的催化组分;为提高催化剂的抗SO_2性能,分别尝试了利用几种金属元素(Sr、Ce、W和Mo)对催化剂进行掺杂改性的方法.结果表明,锰氧化物的催化作用最好,其最佳使用温度在573 K左右;SO_2对零价汞的催化氧化有明显抑制作用,在无SO_2及1 400 mg/m~3 SO_2时锰催化剂对零价汞催化氧化效率分别为93%和78%.而Mo改性的锰氧化物催化剂的抗硫性能大幅提高,在1 400 mg/m~3 SO_2存在的情况下其对零价汞的催化氧化效率可达到90%以上,较其他改性元素高.
령개홍적고효거제시연매연기홍오염공제과정중적관건배절.위료촉진연기중적령개홍전화위역우거제적양화태홍,분별고찰료재유HCl존재시,궤충과도금속양화물(Cu、Fe、Mn、Co화Zr)대령개홍양화적최화작용,이사선출성능교호적최화조분;위제고최화제적항SO_2성능,분별상시료이용궤충금속원소(Sr、Ce、W화Mo)대최화제진행참잡개성적방법.결과표명,맹양화물적최화작용최호,기최가사용온도재573 K좌우;SO_2대령개홍적최화양화유명현억제작용,재무SO_2급1 400 mg/m~3 SO_2시맹최화제대령개홍최화양화효솔분별위93%화78%.이Mo개성적맹양화물최화제적항류성능대폭제고,재1 400 mg/m~3 SO_2존재적정황하기대령개홍적최화양화효솔가체도90%이상,교기타개성원소고.
How to make elemental mercury removed efficiently is the key point for the control of mercury emission from the coal-fired flue gas.To obtain a high conversion from elemental mercury to its oxidation state,which can be easily captured by flue gas desulfurization systems,some catalysts were employed to assist with the oxidation of elemental mercury in the presence of hydrogen chloride,and four metals (strontium,cerium,tung-sten,molybdenum) were used tentatively to modify the Mn-catalyst to improve their tolerance capacity to sulfur dioxide(SO_2).The results showed that the manganese oxide displayed the highest catalytic oxidative efficiency at 573 K,and the removal efficiency of mercury by manganese can reach 93%and 78%without SO_2 and with 1 400 mg/m~3 SO_2,respectively.Once modified with molybdenum,the removal efficiency of manganese oxides was above 90%with 1 400 mg/m~3 SO_2,which was significantly higher than the catalysts modified with the other elements.