摘要
提出了内旋/直流复合流化方式的循环流化床脱硫方法,并用热线风速仪测量了直管段内的冷态气相流场。试验表明,内旋/直流流化是非均匀布风的流化方式;2股气流的混合在距直管段入口2倍直径前基本结束,切向速度在直管段下游近壁处仍较大。复合流化的轴向紊流度接近壁面处最强,而切向紊流度在半径中心有最大值。叶片装在喉部的综合效果好于装在渐扩段,内旋/直流流化的效果好于直流流化。
A composite internally swirling-straight flow proposed. The cold state flow field in the straight pipe desulphurization method for circulating fluidized beds is being section was measured with a hot wire anemometer. Test results indicated that composite internally swirling-straight flow fluidization is a fluidizing method with non-uniform flow distribution; mixing of the two currents basically terminate within a distance, twice the diameter away from the straight pipe＇s entrance, but tangential velocity near the wall, down stream the straight pipe section, remains still quite high. Axial turbulence intensity of composite fluidization is highest near the pipe wall, but the tangential turbulence intensity is highest midway the radius. Blade effects are more pronounce, if installed in the throat, rather than in the diffuser section. Composite internally swirling-straight flow fluidization is more effective than pure straight flow.
出处
《动力工程》
EI
CSCD
北大核心
2007年第4期596-600,共5页
Power Engineering
关键词
环境工程学
烟气脱硫
循环流化床
复合流化
切向速度
紊流度
environmental engineering
flue gas desulfurization
CFB
composite fluidization
tangent velocity
turbulence intensity
