气-气快速喷射混合器的模拟研究

摘要

For developing new jet-mixers, numerical simulations were performed by software Fluent according to the k-εturbulence model, to study the effects of various geometric and process parameters on the mixing characteristics of ethylbenzene gas and steam in multi-jet mixers equipped on the ethyl benzene dehydrogenation unit, the mixing performance of fluids was characterized with the mixing index. It is found that the jet velocity, jet length, jet number and operational load affected on the mixing efficiency significantly. The mixing efficiency of gas-gas mixer was perfect and the total pressure drop was low as jet velocity was equal to 142 m/s, jet length was 40 mm and jet number was six. The results presented here are very useful for the preliminary design of multi-jet mixer for low viscosity fluids.%为开发气-气快速喷射混合器，在Fluent软件平台上，采用k-ε湍流模型模拟研究了乙苯脱氢装置中快速喷射混合器混合效果随混合器结构尺寸和操作条件变化的规律，并用混合指数来表征流体的混合效果。模拟发现，喷嘴喷射速度、喷嘴直管段长度、喷嘴个数和工业负荷变化对气-气快速喷射混合器的混合效果有重要影响。当喷嘴喷射速度为142 m/s、喷嘴直管段长度为40 mm、喷嘴个数为6个时，气-气快速喷射混合器的混合效果最佳、混合压降较小。其模拟研究方法对气-气快速喷射混合器的工程开发有重要的指导意义。