基于CFD的废水厌氧处理系统布水形式数值模拟

Numerical Simulation of Anaerobic Wastewater Treatment System Distribution Based on CFD

研究目的:为了探讨如何提高厌氧系统对污水处理的效果,以厌氧系统两种不同的布水形式为模型,利用CFD数值模拟技术进行数值模拟,分析不同布水形式与流速的关系以及对传质效果的影响。研究结论:(1)两种不同的进水形式对整个反应系统内部的反应效果影响差别较大;(2)在相同速度下,布水形式为穿孔管的反应器,可以有效地缓解体系内部异重流现象的干扰,更利于体系内部传质作用的发挥;(3)对两种不同速度状态模拟的结果显示,无论速度如何变化,对渐扩喇叭口来说,体系内部的湍动规律变化不大;(4)提高进水流速,对穿孔管来说,不仅增加了流体在进水口处的湍动程度,也提高了体系内部流体的整体扰动,这对污水处理效果的提高极为有利;(5)利用模拟技术,从速度和布水形式两个角度得出,布水形式设置为穿孔管利于无动力厌氧污水处理系统内部废水与微生物的混合,更利于提高水处理的效果;(6)该结论可为无动力厌氧反应器布水形式的设计提供参考依据。

Research purposes： In order to explore how to improve the effect of anaerobic wastewater treatment systems,as anaerobic system two different forms of water distribution a model,using CFD numerical simulation techniques to simulate,this paper analyzes the relationship between the different forms of water distribution and the flow rate and the impact on mass transfer effects. Research conclusions：（ 1） The impacts of two different water distribution forms on the reaction of the whole system are quite different.（ 2） At the same speed,the simulation results show that the reactor of water distribution in the form of perforated pipe can effectively alleviate the interference of phenomena of density flow,which is more conducive to the internal mass transfer.（ 3） The results of two different speed status show that,however the speed changes,the turbulence law in the system has little change for divergent trumpet.（ 4） Improving the flow rate,for the perforated pipe,not only increased the fluid turbulence degree of the fluid at the inlet,but also improved the overall disturbance of internal fluid,and thus it is very favorable for the sewage treatment.（ 5） Using simulation technology derived the conclusion from the velocity and water distribution form that water distribution in the form of perforated pipe is beneficial for mixing of internal wastewater and microbes of the unpowered anaerobic wastewater system,more conducive to improve the effect of water treatment.（ 6） The conclusion can provide a reference for the design of water distribution form of unpowered anaerobic reactor.