Experimental study on gas-holdup and gas-liquid interfacial area in TPCFBs

摘要

A new fiber optic probe system has been developed for measuring the gas-holdup #epsilon#_g and bubble size distribution P_s(d_b) in multiphase reactors. Experiments have been carried out in gas-liquid-solid three-phase circulating fluidized bed (TPCFB) with 140 mm inner diameter and 3 m height, in which air, tap water and 0.4 mm glass beads are used as the gas, liquid and solid phase, respectively. Based on the measured data, the gas-liquid interfacial area a, one of the most important parameters concerning the mass transfer, has been derived. The radial profile of the gas holdup and the gas-liquid interfacial area, and the influence of main operating conditions have been studied experimentally in TPCFB_s.