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296 Mirela Panaite et al. Fig. 9. Velocity of solid particle on surface oscillating 4. Conclusions The separation of solid particles after size is a complex process influenced by several factors, which depend of the particles and characteristics of equipment used. In the experimental measurements were used real particles and from analysis of the Triplot chart shows that particle is used as lamellar particle. Because tyrants, stand used in the experimental determinations executed oscillations along three axes. By using two video cameras with purpose to tracking the solid particle trajectory was be achieved, with help of SynthEyes program, obtaining a threedimensional trajectory. Also from experimental data could determine the variation of solid particle velocity on the oscillating surface. REFERENCES Dong K.J, Yu A.B., Brake I., (2009), DEM simulation of particle flow on a multi-deck banana screen, Minerals Engineering, 22, 910 – 920. Li J., Webb C., Pandiella S.S., Campbell G.M., (July 2003), Discrete particle motion on sieves—a numerical study using the DEM simulation, Powder Technology, 133, 1– 3, 30, 190–202. Moşnegutu E., Panainte Mirela, Savin Carmen, Măcărescu B., Nedeff V., (2007), Separarea amestecurilor de particule solide în curenţi de aer verticali, Ed. Alma Mater Bacău. Nedeff V., Moşneguţu E., Băisan I., (2001), Separarea mecanică a produselor granulometrice şi pulverulente din industria alimentară, Ed. Tehnica-Info, Chişinău. Shilin Xie, Siu Wing Or, Helen Lai Wa Chan, Ping Kong Choy, Peter Chou Kee Liu, (January 2007), Analysis of vibration power flow from a vibrating machinery to a
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 297 floating elastic panel, Mechanical Systems and Signal Processing, 21, 1, , 389– 404. Soldinger M., Transport velocity of a crushed rock material bed on a screen, (January 2002), Minerals Engineering, 15, Issues 1–2, 7–17. Stoicovici D.I., Ungureanu M., Ungureanu N., Bănică, M., (2008), A computer model for sieves’ vibrations analysis, using an algorithm based on the “false-position method, American Journal of Applied Sciences, 5, 12, pag.48-56. Szymański T., Wodziński P., Screening on a screen with a vibrating sieve, (2003), Physicochemical Problems of Mineral Processing, vol. 37, 27-36. Trumic Milan and Magdalinovic Nedeljko, (2011), New model of screening kinetics, Minerals Engineering, 24, 42 – 49. Tsakalakis K., (2001), Some basic factors affecting scree performance in horizontal vibrating screens, The European Journal of Mineral Processing and Environmental Protection, I, 42 – 54. Xiao Jianzhang, Tong Xin, (2012), Particle stratification and penetration of a linear vibrating screen by the discrete element method, International Journal of Mining Science and Technology. STUDIUL OBŢINERII TRAIECTORIEI UNEI PARTICULE SOLIDE PE O SUPRAFAŢĂ PLANĂ OSCILANTĂ (Rezumat) O parte din produsele din agricultură sau rezultate din diferite procese industriale sunt supuse separării. Cea mai utilizată metodă de separare a unor astfel de produse o reprezintă separarea după dimensiunile particulelor care alcătuiesc amestecul eterogen. Cu toate că procesul de separare după dimensiuni este unul dintre cel mai răspândit, în literatura de specialitate sunt puţine studii care să prezinte modul de determinare a traiectoriei unei particule pe suprafaţa oscilantă a blocului de site. Articolul de faţă prezintă o metodă de determinare a acestei traiectorii, pentru o particulă reală, utilizând o sită oarbă care execută o mişcare oscilantă plană. Pentru determinarea traiectoriei particulei reale s-au utilizat două camere video care au avut drept scop filmarea deplasării particulei solide după planurile XOY şi XOZ. Cu ajutorul soft-ului SynthEyes s-au extras coordonatele punctului urmărit. Datele obţinute au fost prelucrate ţinându-se cont de distanţa de focalizare şi de unghiul de înclinare al suprafeţei plane. Prelucrarea datelor a avut drept scop determinarea traiectoriei reale a particulei şi viteza de deplasare a acesteia. THEORETICAL ECO-EFFICIENCY COMPARATIVE STUDY CASE, HYDROCARBONS, AMMONIA AND HFC MIXTURE ALTERNATIVES RETROFIT
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