上下流室宽度比对厌氧折流板反应器水力特性的影响

发布时间：2018-06-26 10:15

  本文选题：厌氧折流板反应器 + 上下流室宽度比　； 参考：《净水技术》2017年03期

【摘要】：借助计算流体力学技术(CFD)获取四组厌氧折流板反应器(ABR,上下流室宽度比分别为2:1、3:1、4:1及5:1)的停留时间分布(RTD),并计算串联数(N)、扩散数(D/μL)及水力死区容积占比(V_d/V)等参数,以分析反应器流动、混合等水力特性;在此基础上选择最佳上下流室宽度比值,优化ABR反应器的设计。结果表明:当容积和理论水力停留时间(HRT)相同时,提高上下流室宽度比,N随之降低,最低值为4.80,而D/μL呈上升趋势,最大值为0.118;V_d/V随上下流室宽度比的增大,呈先下降后升高的趋势,比值为4:1时V_d/V最小,仅为3.13%。选取水力效率(λ)作为反应器的水力评价指标,在2:1~4:1的流室宽度比范围内,λ相差不大,属于理想范围。综合考虑反应器流动混合特性、死区占比及水力效率,确定反应器的最佳上下流室宽度比为4:1。
[Abstract]:The residence time distribution (RTD) of four groups of anaerobic baffle reactor (ABR) with the upper and lower flow chamber widths of 2: 1: 1: 4: 1 and 5:1 were obtained by means of computational fluid dynamics (CFD). The parameters of series number (N), diffusion number (D / 渭 L) and dead zone volume ratio (Vd-V) were calculated. The flow and mixing hydraulic characteristics of the reactor were analyzed and the optimum ratio of upper and lower flow chamber width was selected to optimize the design of ABR reactor. The results show that when the volume is the same as the theoretical hydraulic retention time (HRT), the increase of the upper and lower chamber width ratio N decreases and the lowest value is 4.80, while the maximum value of D / 渭 L is 0.118 Vd / V with the increase of the upper-downflow chamber width ratio. The ratio of Vd / V at 4:1 was the smallest, only 3.13. The hydraulic efficiency (位) is chosen as the hydraulic evaluation index of the reactor. Within the ratio of flow chamber width of 2: 1 to 4: 1, 位 has little difference and belongs to the ideal range. Considering the flow mixing characteristics of the reactor, the ratio of dead zone and hydraulic efficiency, the optimum ratio of upper and lower flow chamber width is determined to be 4: 1.
【作者单位】： 河海大学力学与材料学院;河海大学环境学院;
【基金】：国家自然科学基金项目(51208173)
【分类号】：X703
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本文编号：2070042