Simulation of Deposition and Flow Characteristics of Slag in Entrained Flow Gasifiers

Water-wall entrained flow gasifiers ensure long-termsafe operationusing the idea of "fighting slag with slag". Thus, wallslagging is essential for the operation of gasifiers. The gasificationprocess of dry coal power was simulated in the entrained flow gasifierby ANSYS Fluent software for this study. The eddy-dissipation conceptmodel has been used to simulate the homogeneous reaction process inthe gasifier. The unreacted core shrinking model has been used tosimulate the heterogeneous reaction. The discrete phase model hasbeen used to simulate the interaction between the gas phase and particles.The Yong model determines the adhesion of particles on the wall, andthe Seggiani model describes the slag flow on the wall using a user-definedfunction compiler. The slag flow in the gasifier was simulated atan operating temperature of approximately 1750 K. The results showthat the deposition flux of ash particles reaches a maximum valueof 0.32 kg/m(2) s at 2.5 m below the gasification burner,and the deposition flux at the lower slag mouth remains at 0.08 kg/m(2) s. The maximum thickness of the liquid slag and total slaglayers reach 14.4 and 62.7 mm, respectively.