Numerical Simulation Of Flow Field Of WFGD Tower With Tangentially Spray Method

Limestone-gypsum wet flue gas desulfurization(WFGD) technology is a widelyused SO2removal technology. With the increase of SO2emission standard, highermaintenance costs problems about this kind of technology is gradually outstanding.Therefore, improve the efficiency of flue gas desulfurization and reduce theequipment operation cost become a hot topic in the field now.At present, generally increase the spray layer number, expand the absorptiontower volume or increase the serum cycles to improve the efficiency ofdesulfurization. But these methods will increase construction costs or operation cost,it is difficult to improve the efficiency and reduce the cost at the same time.In the WFGD system, flue gas desulfurization tower and droplet motion andinteraction mechanism is to determine the main factors of desulfurization efficiencyand cost. And flue gas desulfurization tower and droplet motion state is under thecontrol of the slurry of desulfurization tower internal nozzle arrangement.In order to solve the above problems,the paper put forward a new kind oftangential nozzle arrangement. Designed under the same conditions separately byroutine arrangement, using tangential arrangement separately, and two ways underdifferent combination situations.This paper employ the Fluent software for a certain power plant300MW unitwet flue gas desulfurization tower internal flow field is simulated. Applying Gambit toreasonable grid calculation model, adopt the standard k-ε model, particle trackingmodel to describe the tower flue gas turbulent flow movement, tracking dropletmovement. With the Simple algorithm for different spray layer combination on thenumerical simulations of the flow field distribution.The results show that the tangential spray way than conventional spray way canbetter enhance the uniformity of flow field. Tangential spray can improve the averagevelocity of flue gas flow, increase the mass transfer effect. QY+QY+CG and QY+QY+QY are the better spray ways among the studyed spary combinations.The study has aguiding significance to improve the desulfurization efficiency.