Evaporating bubble column reactor (EBCR) is a kind of aerated reactor in which the reaction heat is removed by the evaporation of volatile reaction mixture. In this paper, a mathematical model that accounts for the ga...Evaporating bubble column reactor (EBCR) is a kind of aerated reactor in which the reaction heat is removed by the evaporation of volatile reaction mixture. In this paper, a mathematical model that accounts for the gas-liquid exothermic reaction and axial dispersions of both gas and liquid phase is employed to study the performance of EBCR for the process of p-xylene(PX) oxidation. The computational results show that there are remarkable concentration and temperature gradients in EBCR for high ratio of height to diameter (H/DT). The temperature is lower at the bottom of column and higher at the top, due to rapid evaporation induced by the feed gas near the bottom. The concentration profiles in the gas phase are more nonuniform than those (except PX) in the liquid phase, which causes more solvent burning consumption at high H/DT ratio. For p-xylene oxidation, theo ptimal H/DT is around 5.展开更多
To guarantee water quality of waterscapes in Metal Park of Zhenhai District of Ningbo City, and keep it above the Grade-IV specified in Quality Standard of National Surface Water Environment (GB3838-2002), maintain lo...To guarantee water quality of waterscapes in Metal Park of Zhenhai District of Ningbo City, and keep it above the Grade-IV specified in Quality Standard of National Surface Water Environment (GB3838-2002), maintain low maintenance cost and long-term sustainable development of water, basic principles of ecological engineering and aquatic ecosystem balance theory were applied to instruct water treatment in the park. Micro-nano bubble gas-liquid dispersion and plugflow aeration were used to improve water quality.展开更多
基金Supported by the National Natural Science Foundation of China (No. 20076039) and SINOPEC.
文摘Evaporating bubble column reactor (EBCR) is a kind of aerated reactor in which the reaction heat is removed by the evaporation of volatile reaction mixture. In this paper, a mathematical model that accounts for the gas-liquid exothermic reaction and axial dispersions of both gas and liquid phase is employed to study the performance of EBCR for the process of p-xylene(PX) oxidation. The computational results show that there are remarkable concentration and temperature gradients in EBCR for high ratio of height to diameter (H/DT). The temperature is lower at the bottom of column and higher at the top, due to rapid evaporation induced by the feed gas near the bottom. The concentration profiles in the gas phase are more nonuniform than those (except PX) in the liquid phase, which causes more solvent burning consumption at high H/DT ratio. For p-xylene oxidation, theo ptimal H/DT is around 5.
文摘To guarantee water quality of waterscapes in Metal Park of Zhenhai District of Ningbo City, and keep it above the Grade-IV specified in Quality Standard of National Surface Water Environment (GB3838-2002), maintain low maintenance cost and long-term sustainable development of water, basic principles of ecological engineering and aquatic ecosystem balance theory were applied to instruct water treatment in the park. Micro-nano bubble gas-liquid dispersion and plugflow aeration were used to improve water quality.
