空气助力改善气化炉激冷室喷嘴特性的实验研究

Positive effect of air assistant on nozzle's characteristics in quench chamber of gasifier

设计了4种不同结构的用于气化炉激冷室内喷雾激冷的压力雾化喷嘴,采用马尔文激光粒度分析仪和数码单反照相机分别测量了不同压差、不同水流量等工况参数下的液滴粒径(SMD)D32分布和雾化角变化规律,并对4种喷嘴进行了优化选型。研究结果表明:雾滴粒径随压力的增加而减小,随水流量的减小而减小,空气助力可以明显改善液滴的雾化质量;雾化角随压差的增大先增大后趋于平缓;当压差增大到0.4 MPa时,雾滴粒径、雾化角等参数的变化渐趋平缓。通过比较气化炉激冷室中4种压力式雾化喷嘴的测量结果,1-2号内混式空气雾化喷嘴在4组喷嘴中具有最好的雾化效果,当气压为0.8 MPa,水流量为20 L/h时,SMD极小值为16,因此优选出喷嘴1-2作为气化炉激冷室冷模实验的定型喷嘴。

According to the spray-quench chamber＇s size and operating conditions,design four kinds of pressure atomizing nozzles with different structures.Using Malvern laser particle size analyser and digital single reflex camera,research the atomization performance parameters such as sauter mean diameter（SMD） and spray angles while varying differential pressure and water flow.Optimize these four kinds of nozzles.The results show that,increasing pressure and decreasing water flow,the droplets diameter decrease,the air assistant could improve remarkably atomization effect.With the increase of differential pressure,the spray angle first increase,then tend to flatten.The droplets diameter,spray angle and other parameters level off when the differential pressure reaches up to 0.4 MPa.Adopting the #1-2 inner recirculation nozzle,the minimum SMD could reach 16 when the air pressure is 0.8 MPa,the water flow is 20 L/h.So choose the #1-2 inner recirculation nozzle for spray-quench chamber＇s large-scale cold model experiments.