A Simulation Study of Off-Gas Particles Generated from Contact between Pellets in a Laboratory Test
A pin-on-disc tribometer situated in a sealed cylindrical chamber was redesigned and used to find out the correlation between pellets properties and generated particles.To understand the results,it is important to understand the dust particle transport behavior inside the chamber.This could be achieved by using a simulation method.With the simulation,it is also possible to determine the operational parameters which in turn could be used to obtain good experimental results.Therefore,a model was built based on the same geometry as the particle measurement system.The flow field was firstly solved with the renormalized group(RNG)k-ε turbulence model.Thereafter,a simplified drift-flux method was applied to simulate the particle transport inside the test chamber.Two important characteristics,gravitational separation and diffusion are considered in the modelling.Three groups of particles with different diameters(1nm,1μm and 10μm)were released at the contact area between the pellets.The simulation results show that the influence of gravitational setting on particle transport is noticeable for 10μm particles,while the influence can be neglected for 1nm and 1μm.On the other hand,the diffusion has a lesser effect on particle dispersion for 1nm,1μm and 10μm particles.Moreover,the particle loss rate was estimated by the ratio between the amount of released and escaped particles in elapsed time.The results show that the measurable portion of large micro-particles can be increased by increasing the inlet air velocity.
off-gas particle pellets particle transport particle loss rate
Hailong LIU Lage T.I.JONSSON Ulf OLOFSSON P(a)r G.J(O)NSSON
KTH-Royal Institute of Technology,Division of Applied Process Metallurgy,Department of Materials Sci KTH-Royal Institute of Technology,Division of Applied Process Metallurgy,Department of Materials Sci KTH-Royal Institute of Technology,Department of Machine Design,SE-100 44 Stockholm,Sweden
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
972-976
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）