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Simulations of a multicomponent mixture in the reflux classifier todemonstrate the effect of dispersion coefficient on its internal state

Syed Naveedul Hasan, Khan Naseer Ahmed, Habib Muddasar

Physicochemical Problems of Mineral Processing

2020

Vol. 56, iss. 1

76--88

In this study, influence of the dispersion coefficient on the internal state of a multicomponent mixture comprising 35 types of particle species with five different sizes ranging -2.0+0.25 mm and seven different densities, 1400 to 2000 kg/m3, in a reflux classifier under continuous process conditions is presented. Simulations were performed to study the effect of dispersion coefficient on the separation density, D50, separation efficiency, Ep, and solid volume fraction of the multicomponent mixture. The simulation results provided a good agreement with the published experimental results of the reflux classifier, operated at full scale in 2005, for a relatively high value of the dispersion coefficient, 0.0030 m2/s, and a relatively small value of the dispersion, 0.00030 m2/s, in the fluidization and inclined sections of the device, respectively. Moreover, different fixed values of the dispersion coefficient and a published proposed model of the dispersion coefficient were incorporated in the model to examine variations in the system and were compared with the validated simulation results. It was found that the selected values of the dispersion coefficient had not much effect on the D50 values. However, the Ep values changed significantly with changes in the dispersion coefficient values. The smaller values of the dispersion coefficient provided lower values of the Ep that did not match well with the validated simulation results. Furthermore, the variations in the total solid volume fraction within the reflux classifier for different values of the dispersion coefficient has been demonstrated.

Straty od wyższych harmonicznych prądu w transformatorach przekształtnikowych dwunastopulsowych dwumostkowych ze skupionymi uzwojeniami wtórnymi

Jabłoński M.

Energetyka

2005

nr 8

556-560

Strumienie rozproszenia powodowane przez wyższe harmoniczne prądu w transformatorach przekształtnikowych do układów dwunastopulsowych ze skupionymi uzwojeniami mogą powodować uszkodzenie cieplne izolacji uzwojeń. Szczególnie dotyczy to harmonicznych wzbudzających strumień poprzeczny. Aby uniknąć przegrzania, konstrukcja i wymiary przewodów poszczególnych uzwojeń muszą spełniać określone warunki. Próby odbiorcze powinny umożliwić sprawdzenie, czy warunki te są spełnione.

Dispersion fluxes caused by higher harmonics of the current in converter transformers designed for twelve-pulse systems with condensed windings can cause thermal failures of the winding insulation. It concerns especially the harmonics inducing the transversal flux. In order to avoid the overheating, the design and dimensions of the conductors in particular windings should fulfil defined conditions. Commissioning tests should enable to check the fulfilment of these conditions.