چكيده به لاتين
The use of dust concentrator devices coupled with a dust collector devices can improve overall efficiency in fine particles removal processes. In this study, a new design of the zigzag dust concentrator channel was studied in experimentally and Computational Fluid Dynamics simulation. First, in order to find the appropriate geometry, four different geometries of the zigzag dust concentrator channel were studied and compared in terms of efficiency and pressure drop. At this stage, the design of the experiment was based on the Taguchi method and for each geometry a total of eight experiments were performed. After finding the most suitable geometry, with a mean efficiency of 97% , a CFD simulation for this geometry in two-dimensional mode was performed by the FLUENT software using the Eulerian multiphase model for the two-phase gas-solid system. To simulate turbulence, the standard-kω turbulence model was applied. The SIMPLE algorithm for multiphase flow was applied to consider the pressure-velocity coupling. QUICK method has been used for discretizing of convective momentum terms. For the validation, simulation results are compared with experimental results and represent an error of 6.46%. After ensuring simulation results, Design of experiments was carried out to investigate the effect of six independent variables, including particle size, particle density, air inlet flow rate, channel inlet opening, suction ratio and volume fraction of input particles on efficiency and pressure drop based on the Box-Behnken design and all of the 54 proposed experiments were simulated. After analyzing and interpreting the results, mathematical models are presented for efficiency and pressure drop, and the model related indexes show that the models have high accuracy and credibility. The results show that increasing the particle diameter from 8 to 20 microns, led to 20% increment of efficiency, but the pressure drop remains constant. By increasing the particle density from 1000 to 3000 kg / m3, the efficiency increases by 12%, but the pressure drop does not change significantly. As a result of an increase in inlet flow from 100 to 150 m3/h, efficiency is increased by 6 percent, as well as a 273 percent increase in pressure drop. By increasing the size of the inlet opening from 30 to 90 mm, efficiency first increases and then decreases. The pressure drop is also reduced by 87% as a result of this change. By changing the suction ratio from 0.5 to 1, the efficiency increases by 9%, but the pressure drop remains constant. Also, by increasing the volume fraction of input particles from 10-6 to 10-5, the efficiency will increase by 9%, while the efficiency remains constant. The high efficiency of the zigzag dust concentrator, along with its very low pressure drop, indicates the importance of this device from an industrial approach.
