外循环厌氧反应器水力特性研究

Study on Hydraulic Characteristics of Outside Circulation Anaerobic Reactor

根据EGSB的特点,设计了新型外循环(OC)厌氧反应器,用于处理工业废水。利用实验和模拟的方法,对处理量为6.2 L/h,改变回流比(12.9:1、19.8:1、26.7:1、33.7:1和40.6:1)从而改变上升流速(2、3、4、5、6 m/h)的OC厌氧反应器进行水力特性及流态分析。结果表明:上升流速从2 m/h增加到6 m/h,实验的死区体积Vd从22.8%减少到7.2%,模拟的死区体积Vd从21.4%减少到6.3%,且上升流速与死区体积存在线性关系;标准化方差σθ2和离散数D/μL均随上升流速增加呈现先增加后减小的趋势,在上升流速为4 m/h最大,最大值σθ2为0.123,D/μL为0.066;OC厌氧反应器不止一种流态,在反应区下段趋近于全混流,在反应区上段趋近于平推流。

According to the characteristics of EGSB, a new outside circulation(OC) anaerobic reactorwas designed for the treatment of industrial wastewater. Using the experimental and simulation methods, when the OCanaerobic reactor treatment volume is 6.2 L/h, the hydraulic characteristics and flow state were investigated by changing the reflux ratio(12.9:1, 19.8:1, 26.7:1, 33.7:1, and 40.6:1) to change the rising flow velocity(2 m/h, 3 m/h, 4 m/h, 5 m/h and 6 m/h). The results show that: The rising flow velocity increased from 2 m/h to 6 m/h, the dead volume Vdof the experimental decreased from 22.8% to 7.2%, the simulated dead volume Vddecreased from 21.4% to 6.3%, and the rising flow velocity has a linear relationship with the dead volume;When the rising flow velocity increases, the normalized variance and the discrete number increase first and then decrease.When the rising flow velocity is 4 m/h, the normalized variance σθ2 and the discrete number D/μL take the maximum, the normalized variance σθ2 maximum is 0.123, and the discrete maximum D/μL is 0.066. The OC anaerobic reactor exceeds one flow state and approaches the full mixed flow in the lower part of the reaction zone, and approaches the flat flow in the upper part of the reaction zone.