Study On Hydrodynamics Of Gas-liquid Two-phase Flow In Monolith Multi-channel

Monolith multi-channel is the core of the monolith reactor, and used in all kinds of gas-liquid-solid heterogeneous catalysis processes. Nowadays, monolith reactors have been widely used in the field of environment protection such as automotive and stationary emission control. The have also proved huge potentials in fields of methanation, water gas shift, steam reforming, hydrogenation, dehydrogenation and selective oxidation, especially in the field of gas-liquid-solid react. But many of these are just at beginning of research in laboratory. Flow distribution is an important hydrodynamic factor of the multi-channel. It is mainly manifested by the distribution of gas holdup, etc. Influence factors of gas-liquid distribution are gas-liquid superficial velocities, position of the channel and the gas-liquid distributor.First, the visual hydrodynamics determination is set up, and verified. The visual hydrodynamics determination means that the Taylor gas bubbles in the monolith multi-channel are taken photographs with CCD high speed camera, and the hydrodynamic factors can be gained by analyzing the series photographs. It indicates that, corresponding to the conventional methods, the shooting method with CCD high speed camera is a non-invasive method, it is a viable technique for studying two-phase flow in monolith multi-channel, and it will not interfere the fluxion in the channel.Secondly, the hydrodynamic factors are measured and analyzed. The gas holdup in the monolith multi-channel has been investigated experimentally in co-current upward f1ow with a reactor diameter of 20 mm. The influences of superficial gas(0.040-0.057m/s)and liquid(0.144-0.195m/s)velocities,with the distributor of 20 mm height and diameter of 1-2 mm packed with glass on the gas holdup and distribution of gas holdup were examined. The results indicated that the liquid holdup increased with increasing superficial gas velocity,but decreased with increasing superficial liquid velocity; the distribution factor of gas hold-up decreased with increasing superficial gas velocity,but increased with increasing superficial liquid velocity.