For the gas and liquid superficial velocity ranging from 0.07—0.36?m·s -1 and 0.008—0.016?m·s -1 respectively,the significance of operating conditions on the macro-characteristic properties,such as liquid holdup,pressure drop,pulsing velocity and pulsing frequency etc ,are investigated through experiments.Based on the 130 dynamic liquid holdup data a new correlation is proposed for the dynamic liquid holdup as: β d=1.324· γ·Re l 0.057 ·Re g -0.332 ,and correlation of the pressure drop is shown as: Δ p Δ L=∑iA i(1-ε) 2a 2 vε 3μ iu i+B i(1-ε)a vε 3ρ iu 2 i ,where A l=3.84×10 -3 ,A g =9.33×10 -3 ,B l=7.0×10 -5 ,B g =1.59×10 -4 .A new type of corcentric ring conductance probe was used to measure the conductance fluctuation in the trickle bed reactor packed with 4—5?mm glass beads.The pulse velocity and frequency are calculated based on the time series data.Correlations of the pulse velocity and pulse frequency were obtained as V p =1.575u g 1.98 1-0.0864u g 12.01 (1-17.668U l)and f= -2.505 +5.113U g +2.04×10 2U l,respectively.All the correlations have high accuracy in predicting the parameters.
In this work,at a pressure of 2.0 MPa and room temperature,the effects of gas and liquid flowrates, liquid viscosity and operation pressure on the dynamic liquid holdup were investigated in a downward flow and upward flow fixed-bed reactor. With an air-water-solid packing system, experimental results show that the dynamic liquid holdup increased with an increases of liquid mass flowrates.It decreased with an increasing of gas volume flowrates and porosity of packed bed. It was also shown that there was no large effect on dynamic liquid holdup with an increase of liquid dynamic viscosity. The correlations of dynamic liquid holdup was also given under these two kinds of operation.
