摘要
针对脱硫反应器进口弯头处液滴粘壁严重的问题,考虑液滴蒸发后,对气相采用标准湍流脉动κ-ε双方程模型,离散相采用随机轨道模型对碱雾发生器内气液固三相流动进行了模拟,得到了优化前后反应器弯头处的温度场、各相速度矢量场及颗粒浓度场。模拟结果表明,优化前由于多流体碱雾发生器和进口弯头在较底部接触,造成各相在弯头处转矩过大,各组液滴在较大的惯性力作用下容易偏离流线发生粘壁。
With respect to the problem of serious wall adherence of liquid droplets located at the inlet bend of a desulfuriaction reactor a simulation was conducted of the gas-liquid-solid three-phase flows in an alkali-fog generator. Taking into account the liquid droplet evaporation the simulation was carried out by using a standard turbulent pulsation k-ε dual-equation model for the gas phase and a stochastic trajectory model for the discrete phase. As a result, obtained were the temperature fields at the bend portion of the reactor, velocity vector fields of various phases and particle concentration fields both prior to and after the optimization. The results of the simulation indicate that prior to the optimization the torque of various phases at the bend location is excessively great due to a contact of the multi-fluid alkali-fog generator and the inlet bend being realized at a lower bottom. Under the above circumstances the droplets of various groups will deviate from a streamline and adhere to a wall under the action of a relatively large inertial force.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2004年第5期462-466,共5页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(90210016)
关键词
数值模拟
多相流
蒸发
液滴
numerical simulation , multi-phase flow, evaporation, liquid droplets
