a practical approach to pollution reduction in isfahan province steel making plants

today, in addition to environmental effects, air pollution has economical, social and political consequences. such a problem is more striking in metropolitans where a cumulating population, vehicles and industries, altogether produce large amounts of pollution. a discernible example is isfahan city and province, where due to its large steel-producing facilities, as well as the other large facilities and manufacturing plants, solutions to clean air and environment is a demanding task. regarding to this importance, in the current paper, fume extraction systems of steel manufacturing plants are studied numerically and the effect of various parameters as fresh air inlet gap size, fume temperature and composition as well as the dust size is investigated. to aim this goal a precise 3d model of the entire system and the proper computational grid is generated and system of governing equations for the reactive turbulent two-phase flow is solved using a finite-volume based code. the results confirm that although increasing the gap size may lead to a reduction in co volume fraction, but an increase in products temperature is inevitable. besides, it is shown that, despite the high efficiency of settling chamber in removing the large size dust particles (greater than 45 micron), it has a poor efficiency in eliminating the smaller size particles.