Hydrodynamics of a CFB Gasifier with Two Different Cross Sections in the Riser

Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser

“…The cross-sectional solid holdup in both systems were calculated through integral method of the local holdup at four different radial positions. However, in given gas-solid flow systems, the overall hydrodynamics was influenced by gas velocity and mostly because of riser outlet geometries (Prabhansu et al, 2020). However, the experimental results of axial solids holdup in both risers at three different superficial velocities are presented in Figure 8 (smooth) and Figure 9, (abrupt), respectively.…”

“…Various experimentations have been performed to reveal the particle flow characteristics and parametric influences on the CFB system performance (Qiu et al, 2015;Dwivedi et al, 2020;Hassan and Makkawi, 2018). These research studies have been focused on the gas-particle flow characteristics in the whole CFB system (Jiang et al, 2014) or particle distribution in the riser section (Wu et al, 2018;Prabhansu et al, 2020;Issangya et al, 2000). Proper experimentation on the industrial CFB system is not easy because it shall be difficult and complicated with the high range temperature procedures and also releases hazardous highly flammable gases.…”

“…Furthermore, an earlier experimental study on a multi-solid fluidized bed revealed that with increasing the circulation rate of fine particles, the movement of coarse particles continuously decreases (Win et al, 1995). In the multi-phase flow system, drag force is a significant term and it may be responsible for the particle entrainment inside the CFB riser (Yoo et al, 2017;Prabhansu et al, 2020). Earlier research on riser geometry revealed that exit with sharp angle could be better for particle reflection and recirculation internally through the riser (Issangya et al, 2000;.…”