چكيده به لاتين
In this study, the separation of powder particles, derived from physical and chemical interactions in gas transmission lines, was studied using a multi-channel spiral separator experimentally and using computational fluid dynamics simulation. The efficiency and pressure drop of the machine in operating conditions and the effect of the magnetic field were determined on the black powder with the average particle size of 3.27 μm. CFD simulation was performed using a multi-phase olerian-olerian model for Air-Black powder flow using Fluent software. To simulate disturbances, the RNG k-ε model, which is both accurate and fast, is used. To solve the pressure and velocity equations simultaneously, the SIMPLE algorithm is used and the QUICK method is used to distribute the momentum equations. Also, for the simulation of the magnetic field, the Ansys Maxwell software version 17.2 has been used. In the validation of simulation results, an average error of about 15% is observed for efficiency with experimental results. In examining the effect of operating conditions, the system at input speeds up to 120 m³ / hr and mass fraction input of up to 0.02 were studied and the results showed that the highest efficiency was at the highest input speed and the mass fraction input have not had a specific effect on the results. Due to the need for a magnetic structure with a high magnetomotive force (MMF), the required flux density needed at an air gap of 10 cm demanded a great deal of cost and volume, which was practically non-existent in this cyclone. Therefore, in this study both permanent magnet and electric magnet were studied in simulations. In practice, permanent magnet was used to reduce the cost and wanted space for magnetic elements. Magnetic field tests were performed in three parts. The first part was arranged with two magnets which both of them have flux density of 0.3 Tesla, facing each other and fixed on the separator body. In the second part like in the first part, but with the difference that two magnets were opened and closed once in a minute that the magnetic field was interrupted and connected. In the third section, four magnets were used, so that they were placed on each other, and the flux density of each pair was 0.4 Tesla. experimental tests showed that the magnetic field in the first part caused a sharp reduction in efficiency, in the second part, about 1%, and in the third part, up to 1.5%, increased efficiency. However, an increase in efficiency of about 3.2% was observed in simulation mode
