CAJ | 학술논문

基于单质汞是煤热解烟气中主要汞存在形态，提出煤中添加 CaCl2并协同 SCR 催化剂促进热解烟气中单质汞的转化。利用程序升温热解实验台研究煤在热解时汞析出速率及累积释放率，通过积分各形态汞的总析出量分析汞的形态转化，考察煤中添加 CaCl2以及与 SCR 催化剂协同作用对汞的形态转化的影响。结果表明，温度是影响汞析出速率的关键因素，低于430℃时析出速率随温度升高而升高，之后随温度升高而降低；总汞累积释放率在400~500℃随温度呈明显线性正相关关系，600℃时累积释放率达90％左右。随着氯添加量的增加，Hg2＋比例明显提高，在催化剂协同作用下，绝大部分单质汞被氧化成氧化态汞，有利于汞的脱除。
기우단질홍시매열해연기중주요홍존재형태，제출매중첨가 CaCl2병협동 SCR 최화제촉진열해연기중단질홍적전화。이용정서승온열해실험태연구매재열해시홍석출속솔급루적석방솔，통과적분각형태홍적총석출량분석홍적형태전화，고찰매중첨가 CaCl2이급여 SCR 최화제협동작용대홍적형태전화적영향。결과표명，온도시영향홍석출속솔적관건인소，저우430℃시석출속솔수온도승고이승고，지후수온도승고이강저；총홍루적석방솔재400~500℃수온도정명현선성정상관관계，600℃시루적석방솔체90％좌우。수착록첨가량적증가，Hg2＋비례명현제고，재최화제협동작용하，절대부분단질홍피양화성양화태홍，유리우홍적탈제。
Adding CaCl 2 cooperating with SCR catalyst to accelerate the transformation of Hg 0 during coal pyrolysis was proposed based on the fact that elemental mercury was the dominant species in the coal pyrolysis gas. A temperature-programmed tube furnace was set up to investigate the mercury release rate and cumulative release rate during coal pyrol-ysis. The mercury speciation transformation was determined by integration of the total released amount of various forms of mercury. The effect of different chlorine content and synergy of chlorine and catalyst on mercury transformation was in-vestigated. The results showed that mercury emission from coal pyrolysis significantly depended on temperature. The re-lease rate of Hg in coal increased with increasing temperature before 430 ℃,and it decreased subsequently with increasing temperature;Cumulative release rate of mercury showed significant positive linear correlation between 400 ~ 500 ℃,and about 90% mercury was released at 600 ℃. With the amount of chloride was increased,percentage of Hg2 + in gas in-creased dramatically,most of element mercury was oxidized forming Hg2 + under the synergy of catalyst.