2篇
您的检索式：作者名="Kaiwei Chu"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Numerical investigation of separation efficiency of the cyclone with supercritical fluid-solid flow显示文摘The utilization of hydrogen is gaining increasing attention due to its high heating value and environmentally friendly combustion product.The supercritical water circulating fluidized bed reactor is a promising and potentially clean technology that can generate hydrogen from coal gasification.Cyclone is a vital part of the reactor which can separate incomplete decomposition of pulverized coal particles from mixed working fluid.This paper aims to gain in-depth understanding of the cyclone separation mechanisms under supercritical fluid by computational fluid dynamics(CFD).Although the amount of supercritical carbon dioxide in mixed working fluid is minor,it obviously influences the flow fields and separation efficiency of a cyclone.The simulation results suggest that both the decreasing content of supercritical carbon dioxide and adding the extra dipleg cause the promoting performance of cyclones.Research findings could refine the design of supercritical fluid-solid cyclones. | Zeyu Li Zhenbo Tong Aibing Yu Hao Miao Kaiwei Chu Hao Zhang Gang Guo Jiang Chen | 2022 | Particuology2022，20，3： | 0 |
| 2 | Prediction of medium-to-coal ratio effect in a dense medium cyclone by using both traditional and coarse-grained CFD-DEM models显示文摘Dense medium cyclone(DMC)is the working horse in coal industry.In practice,it is usually operated under constant pressure and the operational conditions(mainly medium-to-coal(M:C)ratio and oper-ational pressure)need to be adjusted according to coal washability data(mainly coal particle size and density distributions).Nonetheless,until now it is still not well understood how the M:C ratio would affect the performance of DMCs especially under the practical conditions.In this work,the effect of M:C ratio is for the first time numerically studied under conditions similar to plant operation by using both tra-ditional and coarse-grained(CG)combined approach of computational fluid dynamics(CFD)and discrete element method(DEM),called as traditional CFD-DEM and CG CFD-DEM,in which the flow of coal par-ticles is modelled by DEM or CG DEM which applies Newton's laws of motion to individual particles and that of medium flow by the conventional CFD which solves the local-averaged Navier-Stokes equations,allowing consideration of particle-fluid mutual interaction and particle-particle collisions.Moreover,impulse and momentum connection law is used to achieve energy conservation between traditional CFD-DEM and CG CFD-DEM.It is found that under constant pressure,the M:C ratio affects DMC perfor-mance significantly.The specific effect depends on coal washability or coal type.Under extremely low M:C ratio,the phenomenon that high-quality coal product is misplaced to reject is successfully repro-duced,which has been observed in plants in Australian coal industry and called as'low-density tail'.Moreover,strategies are proposed to mitigate the'low-density tail'phenomenon based on the model. | Zhaoyang Li Kaiwei Chu Zongqing Zhou Yixiong Feng Aimin Wang | 2022 | Particuology2022，20，9： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员