对喷流除尘性能影响因素的正交实验研究  

An Orthogonal Experimental Study of Factors Affecting Dust Removal Performance by Counter Jet Flows

作　　者：张明星[1] 陈海焱[1] 颜翠平[1] 陈国平[1] 

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《热能动力工程》2006年第5期500-504,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家"863"计划基金资助项目(2001AA642010)

摘　　要：为了避免由于水平式对喷流结构造成的部分粉尘颗粒粘附在喷嘴对面的器壁上而引起的除尘效率降低的问题,采用倾斜式对喷流除尘技术收集硫酸铵和硝酸铵混合物粉尘,并用正交表L16(45)安排实验。对喷嘴速度、含尘浓度、喷嘴水平间距、倾斜角度和喷雾化水润湿含尘气流的耗水量这五个影响除尘性能的主要参数各作了4个水平的考察,得到了该条件下的最优方案:喷嘴速度25~27 m/s、含尘浓度0.55~0.65 kg/m3、喷嘴间距0.2~0.25 m、倾斜角度40~60°、耗水量0.21~0.25 kg/kg(粉尘)。实验证明:该条件下的除尘效率最高可达98.6%,而且喷雾化水润湿含尘气流对除尘效率影响最大,并观察得出倾斜式对喷流能有效避免粉尘颗粒粘附在器壁上。A decrease in dust removal efficiency may be caused by the use of a horizontal type counter jet-flow structure,resulting in a portion of dust particles being adhered to equipment walls opposite to spray nozzles.To cope with the above problem,an inclined-type counter jet flow-based dust removal technique was adopted to collect dust particles of the ammonium sulfate and ammonium nitrate mixture with an orthogonal table L_(16)(45) being utilized to optimize experimental parameters.Investigations were performed at four levels of magnitude respectively for the five main parameters affecting the dust removal performance,namely,nozzle velocity,dust-laden concentration,horizontal spacing of nozzles,inclination angle and water consumption of atomized water spray for moistening dust-laden gas flows.As a result,an optimum scheme was identified as follows: nozzle velocity 25～27 m/s,dust-laden concentration 0.55～0.65 kg/m^3,spacing of spray nozzles 0.2～0.25 m,inclination angle 40～60 degrees and water consumption 0.21～0.25 kg for each kilogram of dust.The experiments have proved that the dust removal efficiency under the above condition can attain a maximum of 98.6% and the moistening of dust-laden gas flow by spraying atomized water has the greatest impact on the dust removal efficiency.Through observations,it has been found that the inclined-type counter jet flow can effectively avoid the adhesion of dust particles on the equipment wall surfaces.

关 键 词：对喷流除尘 除尘效率 影响因素 正交实验 倾斜式 

分 类 号：X701.2[环境科学与工程—环境工程]