CFD SIMULATION OF COAL WATER SLURRY FLOWING IN HORIZONTAL PIPELINES
IntroductionThe transportation of coal water slurries in pipelines is popular in numerous industrial applications ranging from coal combustion to gasification or liquefaction processes. For highly concentrated CWS, their flow behaviors are very complex and the experimental investigations are difficult and expensive to perform. To develop a CFD model to predict those technical parameters such as pressure drop, velocity and concentration distribution becomes the endeavor of the researchers. Because the kinetic theory of granular account for collisional and frictional characteristics of the solid phase, it makes the super dense solid-fluid flow tractable within the framework of the Eulerian multiphase model. In recent years, this framework was gradually applied to simulate dense solid-liquid flow behavior in a fluidized bed 1, 2, 3. Only few literatures 4, 5 use the kinetic theory to predict the flow behavior of dense solid-liquid slurry flow in horizontal pipelines. We extend the limited earlier work on the application of Eulerian multiphase approaches with kinetic theory to predict flow behavior of concentrated CWS flowing in horizontal Pipelines. The average solid concentration of CWS is in the range of 30%～53.8% and it is necessary to consider both small-scale fluctuations due to particle-particle collision and large-scale fluctuations due to mixture turbulence. The RNG k-ε turbulent mixture model was incorporated in the govern equation to model two phase flow with strong particle-particle interaction in a large range of Reynolds number. The momentum exchange between the double solid phases is included as a result of bimodal distribution of solid phase. The model validated using data from our experiments and that from literatures. The effects of influx velocity, total solid concentration and grain composition were investigated over a wide range.
Liangyong Chen Yufeng Duan Wenhao Pu Changsui Zhao
School of power and environment,Southeast University, 210096, China
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
77-78
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）