The hydrodynamic and mass transfer characteristics of a downflow liquid jet loop reactor (D-JLR) were studied experimentally with water/air and CMC (carboxymethyl cellulose) solution/air systems. The effects of the ge...The hydrodynamic and mass transfer characteristics of a downflow liquid jet loop reactor (D-JLR) were studied experimentally with water/air and CMC (carboxymethyl cellulose) solution/air systems. The effects of the geometry, the operating parameters and the physical properties of the liquid phase on gas hold-up and mass transfer coefficient were measuered. Compared with other types of gas-liquid reactor, D-JLR shows higher mass transfer coefficient and lower energy dissipation rate, the optimum diameter ratio was found to be about 0.42-0.6. A model for gas hold-up in D-JLR with Newtonian and non-Newtonian fluids has been developed on the basis of the equation of motion and the concept of average mixing length. The prediction of gas hold-up with the model agreed with the experimental results of this work.展开更多
以 Na OH和 CO2 冷模体系系统研究了高气液比、高喉管气速、高传质速率气液类喷射反应器的反应性能 ,考察了五种不同规格文丘里喷嘴的阻力特性和反应性能 ,研究了不同高径比反应釜体对喷嘴阻力及反应器性能的影响。并利用优选的文丘里...以 Na OH和 CO2 冷模体系系统研究了高气液比、高喉管气速、高传质速率气液类喷射反应器的反应性能 ,考察了五种不同规格文丘里喷嘴的阻力特性和反应性能 ,研究了不同高径比反应釜体对喷嘴阻力及反应器性能的影响。并利用优选的文丘里喷嘴和自制的喷射反应器首次对脂肪酸甲酯进行了喷射磺化 ,初步试验取得较好的效果 ,甲酯最高转化率为 95 % ,SO3转化率则达 99% ,可与膜式反应器相媲美。展开更多
The local gas phase flow characteristics of the gas-liquid two phase selfaspirated reversed flow jet loop reactor such as the radial profiles of gas holdup,bubble mean velocity and bubble size,using a miniature dual-s...The local gas phase flow characteristics of the gas-liquid two phase selfaspirated reversed flow jet loop reactor such as the radial profiles of gas holdup,bubble mean velocity and bubble size,using a miniature dual-sensor resistivity probe,were studied experimentally.A new digital processing method,based on threshold combinations of level and slope,was proposed for phase identification by the resistivity probe.In particular,the effects of the liquid jet flowrates on the local gas phase flow parameter profiles in the jet region and the tubular flow region inside the draft tube were discussed.展开更多
文摘The hydrodynamic and mass transfer characteristics of a downflow liquid jet loop reactor (D-JLR) were studied experimentally with water/air and CMC (carboxymethyl cellulose) solution/air systems. The effects of the geometry, the operating parameters and the physical properties of the liquid phase on gas hold-up and mass transfer coefficient were measuered. Compared with other types of gas-liquid reactor, D-JLR shows higher mass transfer coefficient and lower energy dissipation rate, the optimum diameter ratio was found to be about 0.42-0.6. A model for gas hold-up in D-JLR with Newtonian and non-Newtonian fluids has been developed on the basis of the equation of motion and the concept of average mixing length. The prediction of gas hold-up with the model agreed with the experimental results of this work.
文摘The local gas phase flow characteristics of the gas-liquid two phase selfaspirated reversed flow jet loop reactor such as the radial profiles of gas holdup,bubble mean velocity and bubble size,using a miniature dual-sensor resistivity probe,were studied experimentally.A new digital processing method,based on threshold combinations of level and slope,was proposed for phase identification by the resistivity probe.In particular,the effects of the liquid jet flowrates on the local gas phase flow parameter profiles in the jet region and the tubular flow region inside the draft tube were discussed.
