A simulation study of off-gas particles generated from contact between pellets in a laboratory test
2015 (English)In: Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015, Chinese Society for Metals , 2015, 972-976 p.Conference paper (Refereed)
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-e 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.
Place, publisher, year, edition, pages
Chinese Society for Metals , 2015. 972-976 p.
Off-gas particle, Particle loss rate, Particle transport, Pellets, Air, Intelligent control, Ore pellets, Particle separators, Steelmaking, Turbulence models, Cylindrical chambers, Gas particles, Gravitational separation, Operational parameters, Particle loss, Particle measurement systems, Pin on disc tribometer, Pelletizing
IdentifiersURN: urn:nbn:se:kth:diva-194703ScopusID: 2-s2.0-84983161958OAI: oai:DiVA.org:kth-194703DiVA: diva2:1048935
6th International Congress on the Science and Technology of Steelmaking, ICS 2015, 12 May 2015 through 14 May 2015
QC 201611222016-11-222016-10-312016-11-22Bibliographically approved