竖向进水管布置对ABR液相流态影响的PIV试验研究

在折流式厌氧反应器(Anaerobic Baffled Reactor,ABR)不同进水管悬空高度和不同进水流量组合的工况下,利用激光粒子图像测速技术(particle image velocimetry,PIV)对ABR的第一格室液相流态进行了研究,测得反应器内降流区和升流区关键截面的流场数据,获得了液相速度和涡量强度与悬空高度的关系曲线;同时研究了相关流场特征,包括流线图谱和涡量场。结果表明:对于ABR的第一格室,合理的进水管悬空高度可以保证良好的进水流态,促使ABR涡量面积分布均匀,有效防止局部沟流和液相死区,确保ABR高效稳定运行。根据试验分析结果,提出了设计时可供参考的进水管悬空高度的取值范围:流量在0.018～0.270 m³/h时,悬空高度的取值范围为230～530 mm;流量在0.558～0.846 m³/h时,悬空高度的取值为530 mm。

Experimental Research on Effects of Layout of Vertical Inlet Pipe on Flow Pattern of Fluid Phase in Anaerobic Baffled Reactor by Particle Image Velocimetry

The flow pattern of liquid phase in the first cell of anaerobic baffled reactor(ABR) was studied in association with laser particle image velocimetry(PIV) under the combined conditions of different inlet flow rates and suspension heights of inlet pipe of the ABR.Flow field data at key section in downward flow area and upward flow area of the reactor were obtained,and the curves of velocity of liquid phase and vorticity intensity vs.suspension height were acquired.Meanwhile,characteristics of relevant flow fields were obtained,including streamline pattern and vorticity field.Results revealed that reasonable suspension height of water inlet pipe was important for the first cell of ABR,for it could ensure good flow pattern,uniform distribution of ABR vortex area,effective prevention of local channel flow and dead zone at liquid phase and stable operation of ABR.According to the experimental results,we suggest the range of suspension height of inlet pipe between 230-530 mm when flow rate is in the range of 0.018-0.270 m3/h,and 530 mm when flow rate is in the range of 0.558-0.846 m3/h.