化工学报
化工學報
화공학보
CIESC Jorunal
2015年
11期
4366-4372
,共7页
黄荣廷%潘丹萍%盛溢%杨林军
黃榮廷%潘丹萍%盛溢%楊林軍
황영정%반단평%성일%양림군
氨法脱硫%烟气%非均相反应%蒸发夹带%气溶胶%生成特性
氨法脫硫%煙氣%非均相反應%蒸髮夾帶%氣溶膠%生成特性
안법탈류%연기%비균상반응%증발협대%기용효%생성특성
ammonia-basedWFGD%flue gas%heterogeneous reaction%entrainment%aerosol%formation property
利用自行搭建的模拟氨法烟气脱硫实验平台，针对氨法脱硫中脱硫浆液液滴夹带蒸发和非均相反应两种气溶胶生成途径，采用电称低压冲击器（ELPI）、PM2.5/10采样器、场发射扫描电子显微镜（FESEM）等手段对两种途径下生成的气溶胶浓度、粒度分布以及形貌特征进行了测试分析，实验考察了氨法脱硫工艺参数对两种途径下生成的气溶胶特性的影响。结果表明，氨法脱硫中形成的气溶胶颗粒从数浓度角度而言，主要为亚微米级颗粒，从质量浓度分析，则以微米级及更大颗粒为主；脱硫浆液中挥发逸出的气态NH3和烟气中水汽、SO2间的非均相反应是氨法脱硫气溶胶的主要来源，其形成量主要取决于脱硫浆液pH、脱硫塔进口烟温等；其次来自于脱硫液滴的夹带蒸发作用，其形成量主要取决于脱硫浆液浓度、空塔气速等。
利用自行搭建的模擬氨法煙氣脫硫實驗平檯，針對氨法脫硫中脫硫漿液液滴夾帶蒸髮和非均相反應兩種氣溶膠生成途徑，採用電稱低壓遲擊器（ELPI）、PM2.5/10採樣器、場髮射掃描電子顯微鏡（FESEM）等手段對兩種途徑下生成的氣溶膠濃度、粒度分佈以及形貌特徵進行瞭測試分析，實驗攷察瞭氨法脫硫工藝參數對兩種途徑下生成的氣溶膠特性的影響。結果錶明，氨法脫硫中形成的氣溶膠顆粒從數濃度角度而言，主要為亞微米級顆粒，從質量濃度分析，則以微米級及更大顆粒為主；脫硫漿液中揮髮逸齣的氣態NH3和煙氣中水汽、SO2間的非均相反應是氨法脫硫氣溶膠的主要來源，其形成量主要取決于脫硫漿液pH、脫硫塔進口煙溫等；其次來自于脫硫液滴的夾帶蒸髮作用，其形成量主要取決于脫硫漿液濃度、空塔氣速等。
이용자행탑건적모의안법연기탈류실험평태，침대안법탈류중탈류장액액적협대증발화비균상반응량충기용효생성도경，채용전칭저압충격기（ELPI）、PM2.5/10채양기、장발사소묘전자현미경（FESEM）등수단대량충도경하생성적기용효농도、립도분포이급형모특정진행료측시분석，실험고찰료안법탈류공예삼수대량충도경하생성적기용효특성적영향。결과표명，안법탈류중형성적기용효과립종수농도각도이언，주요위아미미급과립，종질량농도분석，칙이미미급급경대과립위주；탈류장액중휘발일출적기태NH3화연기중수기、SO2간적비균상반응시안법탈류기용효적주요래원，기형성량주요취결우탈류장액pH、탈류탑진구연온등；기차래자우탈류액적적협대증발작용，기형성량주요취결우탈류장액농도、공탑기속등。
An ammonia-based wet flue gas desulfurization (WFGD) simulation was built to simulate separately the two different aerosol formation mechanisms in ammonia-based desulfurization process of the inhomogeneous reaction mechanism and the entrainment mechanism. The electrical low pressure impactor (ELPI, Dekati Ltd.) was employed for the online measurement of aerosol concentration in the outlet flue gas after the WFGD scrubber. The pollutant PM sampler was used for aerosol sampling in the flue gas. The samples gathered were then scanned and analyzed by the field emission scanning electron microscope (FESEM). The results showed that the inhomogeneous reaction of NH3 escaped from desulfurization slurry with the moisture and SO2 in the flue gas was the dominating one of the two aerosol formation mechanisms in the ammonia-based WFGD, which produced the majority of the aerosols emitted from the scrubber. It was found that the aerosols were consisted mainly of submicron particles if counted in respect of numerical concentration and micron ones in respect of mass concentration. The amount of aerosols produced was depended mainly on the desulfurization solution pH along with the flue gas temperature at the inlet of WFGD,etc. The entrainment mechanism was of the secondary importance in the aerosol formation in the ammonia-based WFGD. The production of the aerosols was mainly related to the desulfurization solution concentration, the empty tower gas velocity, and so forth.
