本文選題：煤　切入點：燃燒溫度　出處：《化工進展》2017年05期

【摘要】：在管式爐實驗裝置上研究了燃燒溫度對燃煤汞析出特性的影響,利用在線煙氣分析儀和EPA Method 26A濕化學法對燃煤煙氣中O_2/SO_2/NO/CO/HCl/Cl_2等進行同步定量分析,探討不同燃燒溫度下煙氣組分的變化及其在煙氣降溫過程中對汞形態(tài)遷移轉化的影響規(guī)律。結果表明:在高溫燃燒條件(≥750℃)下,煤中汞基本全部逸出,析出率≥97.9%,且隨燃燒溫度升高而遞增;基于氧量分析,煤中汞的析出在揮發(fā)分燃燒階段即開始發(fā)生;隨著燃燒溫度的升高,煙氣中元素態(tài)汞(Hg0)份額逐漸降低,而氧化態(tài)汞(Hg~(2+))份額相應增大,900℃時接近50%;燃燒溫度對煙氣中各組分濃度影響較大,隨溫度升高,煙氣中NO、HCl及Cl_2呈現(xiàn)不同程度的上升趨勢,SO_2含量基本持平,而CO含量逐漸降低;對痕量元素汞而言,NO、HCl及Cl_2通過直接或間接氧化作用在煙氣降溫過程中促進Hg0向Hg~(2+)轉化,煙氣中還原性氣體組分CO對Hg0的氧化有一定抑制作用,SO_2對汞形態(tài)分布的影響則不甚明顯。
[Abstract]:The effect of combustion temperature on the mercury emission from coal combustion was studied in a tube furnace experimental device. The simultaneous quantitative analysis of O_2/SO_2/NO/CO/HCl/Cl_2 in coal-fired flue gas was carried out by on-line flue gas analyzer and EPA Method 26A wet chemical method.The changes of flue gas components at different combustion temperatures and their effects on the migration and transformation of mercury species in the process of flue gas cooling were discussed.The results show that under the condition of high temperature combustion (鈮，

本文編號：1686319