Taking the physical model of cylindrical biogas digester as the research project to design automatic flushing basin of biogas digester, the flow of the digester was rotated by designing feed pipe to be tangential. Fluent was used to analyze the process. It was found that the grit deposition area that was on lower left bottom. Based on the theory of hydraulic similarity, the design digester and the conventional digester were established. The angle between grit discharge pipe and feed pipe was designed for 150° according to the sedimentation law. Water was used as experiment fluid, whose sand contents were 10% . The results showed that sand would be collected at the 3rd discharging at design digester, the grit removal rate was up to 86. 13% at the 5th, the average grit removal rate for 19 times was 3. 81 times of the conventional, and the average of the 5th to 22nd was 82. 17% . The grit removal result of conventional was exceeded by the design.%为实现自流排砂,以圆柱形沼气池为研究对象,进料管设计为弦向,使反应器内部流体产生旋流,并利用Fluent软件对其流场进行模拟分析,确定泥砂最易在底部左下角区域沉积.按水力相似准则建立试验模型,设计排砂管与进料管的夹角为150°,以含砂量为10％的清水作为试验流体,批量连续进料,对自流排砂反应器与常规反应器的排砂性能进行比较.结果表明:自流排砂反应器在第3次排砂就能收集到泥砂,第5次排砂排砂率可达86.13％,前19次平均排砂率是常规反应器的3.81倍,第5～ 22次的平均排砂率为82.17％,明显优于常规反应器.
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