【作者】 李鹏；

【导师】 林爱军； 戴相富；

【作者基本信息】 北京化工大学 ， 环境工程（专业学位）， 2014， 硕士

【摘要】 油田污水沉降罐基本原理是利用重力沉降理论,实现污水中的固体悬浮物颗粒从水相中分离,所分离的固体悬浮物沉积在沉降罐底部形成罐底污泥,工程现场需定期对沉降罐进行排泥操作将罐底污泥排出罐外。射流泵排泥技术作为负压排泥的一种,在射流泵高压水流作用下在泵内形成负压,被负压吸入的污泥在扩散管处实现动能向压能的转换,从而随水流一起排出罐外。本文以射流泵排泥技术为研究对象,通过数值模拟的方法探究了射流泵结构参数变化对排泥效果的影响,并通过室内实验与现场实验验证了参数优化对提高射流泵在实际生产过程中对排泥效率的影响。本文的研究方法和模拟结果对污水沉降罐射流泵排泥装置的设置及运行具有一定的指导意义。本文利用CFD方法对射流泵结构参数与去污性能之间的关系进行了研究。通过建立射流泵流场的三维模型,同时进行计算网格划分与边界条件设置,对射流泵固液两相流场进行数值模拟。研究了喉管与喷嘴断面比、扩散管扩散角等因素与射流泵去污性能的关系。根据数值模拟结果,以射流泵入口压力、吸入端压力、喉管入口与扩散管出口固相比为指标,分析了断面比、扩散管扩散角对射流泵去污能力的影响,在综合考虑压力和固相比的情况下,表明当断面比R为0.54、扩散管扩散角为6.5度时,去污效果最好。通过室内实验表明,当射流泵选择截面比为0.5的喷嘴助排液流量为6-8m3.h-1时,射流泵可以达到最好的工作状态。通过增加助排液流量可以提高喷嘴附近负压从而达到更好的排泥效果。针对现场射流泵排泥效果不佳的情况,可以通过增加射流泵的安装密度来避免,使得单个射流泵的覆盖面积需小于2m2,来提高排泥效果。还可通过调整污水处理药剂污泥流动性或增加罐底冲泥辅助来提高排泥效率。更多还原

【Abstract】 Oilfield wastewater settling tank basic principle is the theory of gravity sedimentation, the main sewage suspended solids particles separated from the aqueous phase separation of suspended solids deposition in the bottom of the settling tank to form the tank bottom sludge, the scene needs to be settling tank sludge action tank bottom sludge discharge tank. Sludge suction jet pump technology as a sludge, in a high pressure water jet pump vacuum formed in the pump, the negative pressure is sucked Sludge kinetic energy to convert the pressure of the expansion pipe, which flow with together discharge tank. In this paper, the jet pump mud technology for the study, through numerical simulation methods to explore the structure of the jet pump effect parameter changes on mud, and improve the efficiency of the jet pump mud in the actual production process through laboratory experiments and field experiments.Based on CFD method to study the structural parameters of the jet pump, decontamination performance and other aspects. Through the establishment of a three-dimensional model of the jet pump flow field, while the calculation mesh and boundary conditions set, sand pump jet exhaust phase flow field numerical simulation. The relationship between the pipes and the nozzle section than the diffusion angle diffuser jet pump decontamination factors and performance:According to the simulation results to the jet pump inlet pressure and suction side pressure, diffusion tube inlet and outlet pipes compared to solid indicators, analyzes the cross-section than the diffusion effects of pipe diffusion angle of the jet pump decontamination capability, in considering the pressure and solid compared to the case when the cross-section ratio R obtained was0.54, the diffusion tube diffuser angle of6.5degrees, decontamination best conclusion.Through laboratory experiments shows that when the jet pump nozzle to help select cross-section ratio of0.5for the drainage flow6-8m3/h, the jet pump can achieve the best working condition. By increasing the flow rate can be increased to help drain suction nozzle near the mud so as to achieve better results. For the poor live mud jet pump effect, to be installed by increasing the density of the jet pump to avoid, covering an area of single jet pump must be less than2m2. Pharmacy can be reduced by adjusting the wastewater treatment sludge liquidity or increase red mud auxiliary tank bottom sludge to improve efficiency.Research methods and simulation results in this paper has some guiding significance for the design and operation of sewage sludge settling tank jet pump device.更多还原