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Experimental study of atomization and spray characteristics of
air-assisted coal water slurry nozzle of high fluid loading |
DU Cong, HUANG Zhen-yu, LIU Jian-zhong, ZHAO Zi-tong, LI Bo,
ZHOU Jun-hu, CEN Ke-fa |
| State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China |
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Abstract An experimental study was conducted to investigate the performance of air-assisted coal water slurry (CWS) nozzle. A novel designed air assisted high fluid loading CWS injector was presented. The influence of the structure parameters on the atomization and spray characteristic was illustrated in the experiment, which was analyzed according to the theory of fluid dynamics and atomization. Results showed that the diameters of the Y-shaped gas orifices, the orifice of nozzle end, the slurry orifice and the mixing chamber all influenced the relationship between injection pressure and flux, and the diameter of slurry orifice had a direct effect on the slurry pressure. The impact of scale of the nozzle orifice and the Y-shaped orifice was larger than that of the T-shaped orifice. A semi empirical flow characteristic equation was obtained with the multi-parameter regression method. The experimental results of spray Sauter mean diameter (SMD) showed that the atomization performance was improved with an increase of the diameter of the Y-shaped gas orifice.
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Published: 05 May 2011
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大容量空气雾化水煤浆喷嘴的实验研究
对空气雾化水煤浆(CWS)喷嘴进行实验研究.提出适合于空气雾化的大容量撞击式水煤浆喷嘴,在实验台上研究结构参数对流量和雾化特性的影响,结合流体力学及雾化理论对喷嘴结构和实验结果进行分析.实验表明,影响喷嘴流量特性（气浆压力和流量间的相互关系）的主要参数有Y型气孔尺寸、混合室直径、浆孔直径、雾化头出口孔尺寸等,其中浆孔直径的变化显著影响浆压；出口孔径、Y型气孔尺寸的影响大于T型气槽宽度和混合室直径的影响；通过多元参数回归得到喷嘴流量特性的半经验方程；索太尔平均粒径(SMD)测量结果显示,较大的Y型气孔能够强化雾化头的雾化作用,改善雾化性能.
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