摘要
针对常规旋风分离器中的“灰斗返混”问题 ,有研究者提出在旋风分离器底部增设一直管 ,使含尘气流进入其中进一步分离。本文应用雷诺应力输运模型对常规旋风分离器和加直管旋风分离器内部气相流场进行了数值模拟 ,并分析了常规旋风分离器锥体底部的下行流量。结果表明 :常规旋风分离器锥体底部的气流旋转还很激烈 ,其下行流量并不为零 ,而加直管旋风分离器使尾涡停留在直管中 ,增加了粉尘的分离空间 。
To cope with the problem of the re-entrainment into the hopper of fine dust particles in an inner vortex flow due to the agitation of separated particles occurring in conventional cyclone separators, some researchers have proposed the adding of a straight pipe at the bottom of the separator, thereby allowing dust-laden air to enter the pipe for further separation. By using a Reynolds Stress Transportation Model (RSTM) a numerical simulation was conducted of the internal gas-phase flow field in a conventional cyclone separator and in a cyclone separator with an added straight pipe at its bottom. Furthermore, an analysis was performed of the downward flow at the cone bottom of the conventional cyclone separator. The results of the analysis indicate that the gas flow eddying at the cone bottom of the conventional cyclone separator is found to be still very intense and its downward flow does not amount to zero. On the other hand, the cyclone separator with an added straight pipe has made its tail vortex stagnating in the straight pipe. This has led to the provision of an additional separation space for ash dust, creating a favorable condition for its further separation.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2005年第1期41-44,共4页
Journal of Engineering for Thermal Energy and Power
关键词
旋风分离器
直管
雷诺应力输运模型
数值模拟
cyclone separator, straight pipe, Reynolds stress transportation model, numerical simulation
