Study on Multiphase Flow and Mixing in Semidry Flue Gas Desulfurization with a Multifluid Alkaline Spray Generator Using Particle Image Velocimetry
Study on Multiphase Flow and Mixing in Semidry Flue Gas Desulfurization with a Multifluid Alkaline Spray Generator Using Particle Image Velocimetry
复制标题
多流体碱性喷雾发生器半干法烟气脱硫中多相流与混合的粒子图像测速研究
DOI：
10.1021/ie8019714
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发表时间：
2009-05
影响因子：
4.2
通讯作者：
Zhou Yuegui
中科院分区：
文献类型：
--
作者：
Zhang Mingchuan;Wang Dongfu;Zhou Yuegui
采用粒子图像测速技术（PIV）对多流体碱雾发生器半干法烟气脱硫实验装置内气-液-固多相流场进行了测量。研究了受限碱性喷雾发生器和管道弯管段内气-液-固多相流的流动结构、混合特性和相间相互作用。结果表明，在受限碱性喷雾发生器中，吸附剂颗粒被高速喷雾射流夹带到喷雾核心区，大部分吸附剂颗粒能被喷雾细水滴有效增湿，形成石灰浆液液滴。此外，发生器中的最小量的空气流是必要的，以实现吸附剂颗粒和喷雾水滴之间的更高的碰撞加湿效率，并防止细小液滴在壁上的可能沉积。适当的发生器浆液液滴穿透长度可使形成的浆液液滴在风管弯管段与主气流均匀混合，有利于提高脱硫效率和防止液滴在管壁上沉积。
Particle image velocimetry (PIV) technique was used to measure the velocity fields of gas-droplet-solid multiphase flow in the experimental setup of a novel semidry flue gas desulfurization process with a multifluid alkaline spray generator. The flow structure, mixing characteristic, and interphase interaction of gas-droplet-solid multiphase flow were investigated both in the confined alkaline spray generator and in the duct bent pipe section. The results show that sorbent particles in the confined alkaline spray generator are entrained into the spray core zone by a high-speed spray jet and most of the sorbent particles can be effectively humidified by spray water fine droplets to form aqueous lime slurry droplets. Moreover, a minimum amount of air stream in the generator is necessary to achieve higher collision humidification efficiency between sorbent particles and spray water droplets and to prevent the possible deposition of fine droplets on the wall. The appropriate penetration length of the slurry droplets from the generator can make uniform mixing between the formed slurry droplets and main air stream in the duct bent pipe section, which is beneficial to improving sulfur dioxide removal efficiency and to preventing the deposition of droplets on the wall.