Development of converging-diverging multi-jet nozzles for molten smelt shattering in kraft recovery boilers

E. Jin, T. Habib, Simon Youssef, Steve Osborne, H. Tran
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引用次数: 0

Abstract

The effective shattering of molten smelt is highly desired in recovery boiler systems. Ideally, shatter jet nozzle designs should: i) generate high shattering energy; ii) create a wide coverage; and iii) minimize steam consumption. This study proposes a novel converging-diverging multi-jet nozzle design to achieve these goals. A laboratory setup was established, and the nozzle performance was evaluated by generating jet pressure profiles from the measurement of a pitot tube array. The results show that the shatter jet strength is greater with a large throat diameter, high inlet pressure, and a short distance between the nozzle exit and impingement position. Increasing the number of orifices generates a wider jet coverage, and the distance between the orifices should be limited to avoid the formation of a low-pressure region between the orifices. The study also demonstrates that an optimized converging-diverging multi-jet nozzle significantly outperformed a conventional shatter jet nozzle by achieving higher energy and wider coverage while consuming less steam.
硫酸盐回收锅炉熔体粉碎用聚散式多喷嘴的研制
在回收锅炉系统中,有效粉碎熔融熔体是非常需要的。理想情况下,粉碎喷嘴的设计应该:i)产生高的粉碎能量;Ii)建立广泛的覆盖面;iii)尽量减少蒸汽消耗。本研究提出了一种新型的会聚发散多喷嘴设计来实现这些目标。建立了实验室装置,并通过测量皮托管阵列产生的射流压力曲线来评估喷嘴的性能。结果表明:较大的喉道直径、较高的进口压力和较短的喷嘴出口与撞击位置之间的距离可以提高破碎射流的强度;增加孔口的数量可以产生更大的射流覆盖范围,并且孔口之间的距离应该受到限制,以避免孔口之间形成低压区。该研究还表明,优化后的聚散多喷嘴在消耗更少蒸汽的同时,获得了更高的能量和更大的覆盖范围,显著优于传统的破碎射流喷嘴。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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