【摘要】 为了解煤燃烧过程中易挥发微量重金属元素的行为及其控制因素,对黔西南烟煤和无烟煤进行了层燃实验和流化床燃烧实验。结果表明,层燃实验,煤中Hg在150℃挥发率达50.25％。到815℃几乎全部释放,Se的挥发率平均在98％以上。950℃下煤中As、Sb的挥发率平均为36.77％和34.47％。流化床燃烧,煤中绝大部分Hg以气态排放到大气中,部分Se以气态排放;微细颗粒吸附Hg、Se、As和少量的Sb以吸附态排放。赋存状态、燃烧方式以及燃烧工况等对微量重金属的挥发性有明显的控制作用。更多还原

【Abstract】 For understanding the volatility of trace metals in coal combustion, the anthracite and bituminous coal samples were burned in a fixed bed (FB) combustor and in a bench-scale circulating fluidized bed (CFB) combustor. The experimental result showed that the volatility of mercury in coal was 50.25% at 150℃, most of mercury and selenium in coal volatilized in fixed bed combustion at 815℃. The volatility of arsenic and antimony were 36.77% and 34.47% respectively in fixed bed combustion at 950℃. In CFB combustion of coal, most of mercury and a part of selenium released in gaseous state, arsenic, selenium, and antimony released mainly with fine particles. The volatilized trace metals emissions are controlled by the mode of occurrences, combustion modes and combustion conditions.更多还原