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1.
V. O. Yablonskii 《Chemical and Petroleum Engineering》2006,42(3-4):119-127
A mathematical model is developed for the separation of suspensions with a non-Newtonian disperse medium by pressurized flotation
in a cylindrical-conical hydrocyclone. The system of motion equations for the solid-phase particles, which takes into account
the forces of inertia and Coriolis acceleration, is solved simultaneously with the kinetic equation of the pressurized-flotation
process.
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Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 3, pp. 3–7, March, 2006. 相似文献
2.
V. O. Yablonskii 《Chemical and Petroleum Engineering》2007,43(11-12):639-646
A regression model is derived for the separation of nonuniform liquid systems with non-Newtonian properties by dual-stage pressure flotation in a film-flow regime created in the centrifugal force field in hydrocyclones. The regression model is presented in the form of a relationship between integral separation indicators in the cyclone and determining similitude numbers and rheologic properties of the dispersion medium. The model makes it possible to calculate with an accuracy sufficient for practical purposes the structural and regime parameters of cylindrical-conical and cylindrical hydrocyclones/flotation plants as a function of assigned integral separation indicators at the outlet from the vessel. 相似文献
3.
在常规水力旋流器的圆柱段充气,并改进溢流结构,提出了一种柱段充气旋流器。以柴油-水混合液为介质,在改变充气旋流器进口液体流量、分流比、气/液比和底流压力这4个操作参数时,考察了流量-压力-压降特性与油-水分离效率的变化规律。结果表明,充气与不充气时,充气旋流器的流量-压力-压降特性变化趋势一致。充气旋流器的油-水分离效率随进口液体流量、分流比、气/液比和底流压力这4个操作参数值的增加,呈先增后降的趋势;充气时比不充气时的油-水分离效率要高,表明充气浮选具有强化旋流分离效率的作用。油滴颗粒的分级效率随油滴颗粒的直径变大而增加。根据实验数据建立了分级效率的数学模型,模型预测值与实验值吻合较好。 相似文献
4.
V. O. Yablonskii 《Chemical and Petroleum Engineering》2008,44(7-8):417-424
A procedure is developed for calculation of suspension-separation indicators of hydrocyclones using a regression model, which describes the suspension-separation process with a non-Newtonian dispersion medium in hydrocyclones, and is presented in the form of a relationship between the distribution of integral separation indicators over the height of the effective space and the determining similitude numbers and rheologic constants of the medium being separated. The influence exerted by the determining similitude numbers and rheologic constants of the medium being separated on the distribution of the degree of thickening of solid-phase particles over the height of the working space of the hydrocyclone is analyzed in conformity with the regression model obtained. 相似文献
5.
基于计算流体动力学(Computational Fluid Dynamics, CFD)软件Fluent,以螺旋增压式串联旋流器为研究对象,采用Eularian-Eularian方法模拟,分析了不同处理量及分流比条件下旋流器的分离性能,并完成室内及井口分离性能试验设计,开展了旋流器分离性能试验研究。结果表明,处理量在2.4~7.2 m3/h变化时,旋流器的分离效率随着处理量的增大逐渐升高; 处理量大于4.8 m3/h时,分离效率增幅缓慢。分离效率随分流比的增大呈现出先增加后减小的趋势,得出最佳分流比为32%,最佳处理量为4.8 m3/h,试验结果与模拟结果吻合良好。 相似文献
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为提高水力旋流器含聚适用性,设计出一种机械降黏装置,利用该装置能使聚合物分子链断裂,减小处理液的黏度,从而减小黏度对水力旋流器分离性能的影响。通过对不同工况条件下的降黏效果分析得出,降黏装置对聚合物溶液降黏效果明显。为验证在不同聚合物浓度条件下,水力旋流器串联降黏装置前后分离性能,开展了室内实验研究。实验结果表明,不同含水率、处理量条件下,水力旋流器串联降黏装置后,质量浓度在300 mg/L以内的聚合物溶液经水力旋流器分离后,油水分离效率均能达到99%以上;在部分工况质量浓度为400 mg/L的聚合物溶液条件下也达到了99%。可见,水力旋流器前端串入机械降黏装置能够拓宽其含聚适用性。 相似文献
8.
注聚采出水分离用动态水力旋流器特性研究 总被引:6,自引:1,他引:5
原有的地面工艺和设备已不能满足聚合物驱采出水分离的要求。采用自行研制的动态水力旋流器,在增压与不增压两种工艺流程下,分别进行了流量和转数对分离效率的影响、转数与压力降的关系,以及入口压力与处理量的关系等项试验研究。试验结果表明,与静态水力旋流器相比,动态水力旋流器的分离效率明显提高,一般可提高10%左右;压力损失显著降低,约可减少0.1MPa,足见可在低压下工作,易于实现无泵运行;无泵运行明显比有泵增压运行的分离效率高,但处理量会有所降低。将动态水力旋流器应用于聚合物驱产出水的油-水分离处理是完全可行的。 相似文献
9.
水力旋流器内分离介质流动分布特征数值模拟 总被引:4,自引:0,他引:4
提出了脱油型水力旋流器参数关系的结构模型,依据建立和修正的分离场的k-ε湍流数学模型,进行了网格划分,确定出边界条件.描述了水力旋流器内部分离介质的三维流动分布特征对分离性能的影响.对旋流器压力场、速度场和分离介质运动迹线分布特征的数值模拟进行了研究.分析了旋流器内部分离介质流动分布特征的数值模拟结果,实际测试的分布结果与流动场结构中理论计算的分布结果相一致.通过合理控制旋流器操作参数(如流量、压力和分流比等)来实现最佳的分离效果.该研究将为改进水力旋流器结构设计、提高分离性能和降低能耗损失提供参考,也为其更好的推广应用奠定一定的基础. 相似文献
10.
微孔注气式旋流器分离性能试验研究 总被引:1,自引:0,他引:1
为了满足油田三次开采后水处理的高要求,设计了新型水力旋流器——微孔注气式旋流器。针对影响该旋流器分离性能的因素进行了试验研究,分别在大锥段注气和小锥段注气的2种注气方式下,研究了该旋流器的含气体积分数和分流比对分离效率的影响,以及分流比与压降比的关系,并进行了对比。结果表明:旋流器的最佳分流比为25%,最佳含气体积分数为30%,旋流器的压降比随着分流比的增加而加大;大锥段注气时,旋流器的最高分离效率为85.4%,平均分离效率为84.0%;小锥段注气时,旋流器的最高分离效率为89.2%,平均分离效率为87.3%。最后指出小锥段注气为最佳注气方式。 相似文献
11.
粒级效率是评价除油旋流器分离性能的重要指标,由于油滴对剪切非常敏感,不能采用固液分离所用的粒级效率测量方法。通过介绍固液分离中粒级效率测量方法,提出了采用具有不同中粒径油滴测量除油旋流器粒级效率的方法。根据粒级效率的定义,推导出除油水力旋流器总分离效率和入口油滴粒度分布的函数关系式,利用该式进行多元线性回归,可以求得除油旋流器的粒级效率曲线。通过对公称直径25mm无涡流探测管旋流器测试结果的具体分析,表明该方法的回归线性程度较好。 相似文献
12.
D. A. Baranov A. I. Pronin V. A. Dikov A. A. Ivanov N. A. Kolesova I. A. Balakhnin M. G. Lagutkin 《Chemical and Petroleum Engineering》2007,43(7-8):385-388
It is pointed out that the operating indicators of a hydrocyclone will depend on its structural and regime operating parameters,
while its standard size will be determined by the diameter of its cylindrical section. Both the separation and also the economic
indicators will depend on correct selection of the standard size of the hydrocyclone for the specific suspension (emulsion)
to be separated. Designs of hydrocyclones are presented in metallic and plastic versions intended for use over a broad range
of flow rates and physicochemical properties of the suspensions being separated.
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Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 7, pp. 20–22, July, 2007. 相似文献
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Three different inlets of hydrocyclone are studied in combination with the construction of a downhole system and hydrocyclone. By comparing the relationship between the inlet structure & dimensional parameter of hydrocyclone and separation efficiency & pressure loss, the highest efficiency is obtained from the inlet of an involute curve with increasing depth-width ratio from the three types, in which the separation efficiency and pressure loss all drops slowly, for the length of the channel decreases, while it drops rapidly in the other two. The flow guiding ability of the inlet affects the separation efficiency greatly, so the corresponding involute type of inlet of hydrocyclone fits for downhole oil-water separation is optimized, which serves as a basis for the structural design of downhole hydrocyclone. 相似文献
15.
井下双级串联式水力旋流器数值模拟与实验 总被引:1,自引:0,他引:1
利用Euler-Euler法与大涡模拟相结合对井下双级串联式水力旋流器的分流特性和分离特性进行研究,并与实际实验结果相对比。结果表明:入口流量由20 m3/d增加到60 m3/d时,总分流比的范围逐渐变大,且第一、二级水力旋流器的溢流口流量之比与总分流比的变化关系是函数关系;在一定范围内,底流含油质量浓度随着入口流量的增大先减小后增大,随着总分流比的增大先减小后增大;入口流量为25~50 m3/d且总分流比为0.28~0.75时,底流含油质量分数不大于200×10-6;数值模拟预报的分流特性与实验结果一致,预报的分离特性与实验结果存在一定差异。该模拟解决了文献[23]提出的监测模型难以用于配带双级串联式水力旋流器井下油水分离系统工况诊断的问题,并给出了井下工况调节时总分流比的推荐范围,从而可以为现场应用提供一定指导。 相似文献
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泡沫浮选分离技术是近几十年发展较快的分离技术之一。基于表面活性剂的泡沫浮选分离技术具有分离和浓缩功能,并以界面吸附为基础。本文通过对分离机理及影响因素的分析,探讨了表面活性剂在泡沫浮选分离中的重要作用,简述了表面活性剂在泡沫浮选分离中的应用前景。 相似文献
18.
在分析水力旋流器基本组成与工作原理的基础上,采用计算流体力学(CFD)技术进行了水力旋流器的仿真模拟,分析了分流比、进口体积分数及溢流管壁厚对水力旋流器分离性能产生的影响。结果表明:分离性能随着分流比的升高而升高,但其升高的幅度由具体旋流器结构而定;随着体积分数的增加,旋流器对0.07~0.10mm粒径的分离效率呈简单的单调下降趋势;在相同操作条件下,旋流器溢流管壁厚的增加可以使分离效率提高,能耗降低。 相似文献
19.
It is shown that one can determine the solid-phase content in the separation products from a hydrocyclone on the basis of the diameter for the limiting grain size in the separation, but that approach does not allow one to calculate the grain-size distribution in the dispersed phase of the separation products. The separation in a cylindroconical hydrocyclone is considered not only in the traditional way, for the conical part of the body below the lower edge of the upper drainage tube, but also in the cylindrical part of the body. The proposed approach enables one to calculate not only the solid-phase concentration in the concentrated and clarified products but also the grain-size compositions in the separation products. 相似文献