EGSB反应器的流态模拟研究

Simulation of Flow Patterns in EGSB Reactor

用自来水加葡萄糖配成10000mg/L的溶液模拟废水,用强碱性阴离子树脂模拟生物颗粒污泥,用注入空气的方式模拟反应器中产生的沼气的方法,研究了颗粒污泥膨胀床反应器中的流态情况。结果表明:上升流速vup是影响EGSB反应器膨胀性能的主要参数,vup小于10m/h时,模拟的颗粒污泥不会流失;vup为3,4和6m/h时,通过示踪剂浓度计算出的试验平均停留时间分别为54.2,46.2,28.3min,均小于各自的理论平均停留时间,说明反应器中存在死区。在理论停留时间为30,45,60min时,反应器中的死区百分比分别为5.6%,5.3%,9.7%,离散数分别为0.134,0.105,0.092。

The flow patterns in expanded granular sludge bed was studied. A 10 000 mg/L solution prepared with portable water and glucose was used to simulate the waste water, a strong-alkaline anion-exchange resin was used to simulate the biological granular sludge, while the methane produced in the EGSB reactor was simulated by injecting air. The result indicated that the flowing up velocity vup was the primary parameter affecting the expandability of the EGSB reactor; when vup was lower than 10 m/h, the simulated granular sludge did not flow away, while when vup was 3 m/h, 4 m/h and 6 m/h, the experimental average residence time calculated against the concentration of the tracer was 54.2 min, 46.2 min and 28.3 min respectively, each of which was smaller than its respective theoretical average residence time, which indicated the existence of dead zones. When the theratical residence time was 30 min, 45 min and 60 min, the percentages of dead zone in the reactor were 5.6%, 5.3% and 9.7%, and the dispersion numbers were 0.134, 0.105 and 0.092 respectively.