ผลของแผ่นปะทะแบบวงแหวนที่มีต่ออุทกพลศาสตร์และการผสมในท่อไรเซอร์ของเครื่องปฏิกรณ์ฟลูอิไดซ์เบดแบบหมุนเวียนโดยการจำลองแบบซีเอฟดี / ธัชชัย สำรวมเพียรสกุล = Effect of ring baffles on hydrodynamics and mixing in a riser of circulating fluidized bed reactor using CFD simulation / Thatchai Samruamphianskun
In this research, the risers of circulating fluidized bed reactors with and without ring baffle were simulated to study hydrodynamics and mixing by using computational fluid dynamics simulation and to examine factor effects by using design of experimental method. The results showed that baffle opening area and interaction between baffle opening area-space between baffles were the parameters that affected standard deviation of solid volume fraction in radial direction. Space between baffles, interaction between baffle opening area-space between baffles and interaction between baffle opening area-number were the parameters that affected average of solid volume fraction in the riser. The operating condition parameters that had an effect on the average of solid volume fraction in the riser for both ring baffle configuration with lowest standard deviation of radial solid volume fraction and highest averaged solid volume fraction in system cases were inlet gas velocity and solid mass flux but the first two operating condition parameters that had an effect on the standard deviation of solid volume fraction in radial direction were inlet gas velocity and interaction between inlet gas velocity-diameter of solid-density of solid. In addition, the shapes of ring baffle were also found to have an effect on the standard deviation of solid volume fraction in radial direction and average of solid volume fraction in the riser. From all simulation results, the optimum ring baffle configuration and operating condition which were improving hydrodynamics and mixing in riser was proposed. In addition, a regression model for predicting the gas-solid mixing was obtained for further using in the design stage of a circulating fluidized bed reactor.