Design of fluidized Gas—Solids flow in standpipes

Abstract Industrial standpipes for gas—solid recirculation systems are often installed with slide valves at their lower end for control of solid flow and pressure balance. By combining the equations for gas—solid dense phase flow with equations for flow of fluidized solids through an orifice, a set of equations is presented for standpipe design. The equations permit quantitative design of a standpipe and can be used to predict the effects of terminal pressure, slide valve opening position and aeration rate on gas and solid circulation rates, flow pattern and pressure profile in standpipes.