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化工学报  2014 

水力喷射空气旋流器中射流流型及其对传质面积和气相压降的影响

DOI: 10.3969/j.issn.0438-1157.2014.08.009, PP. 2914-2920

Keywords: 气液两相流,吸收,界面,流型,射流,气体旋流器

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Abstract:

为了进一步提高水力喷射空气旋流器(WSA)的传质效率以及认识射旋流体系的气液传质机理,对WSA中的射流流型进行了系统的观察研究,绘制出了不同进口气速下射流流型图。以CO2-NaOH化学吸收体系测定了相应射流流型下的有效比相界面积a。结果表明,在低射流流速(≤4.42m·s-1)下,液相射流随着进口气速增大,主要存在稳态射流、变形旋线射流、破碎旋线射流、雾化旋线射流、贴壁雾化旋线射流5种流型;在高射流流速(≥6.19m·s-1)下,射流主要出现稳态射流、破碎旋线射流以及雾化旋线射流3种流型。a值与流型有关,雾化旋线射流下的a值大于其他流型下的对应值。低流速下的贴壁雾化,不利于气液两相充分接触,对应a值较小。a值与射流流速有一定关系,随着射流速度的增大而略有增大,且随着射流流速增大至8.84m·s-1以上,增大的幅度变大。

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