Simulation and experimental analysis of the influence of operating parameters on oil-water-sand separation performance of three-phase decanter centrifuge

doi:10.16085/j.issn.1000-6613.2022-0799

Abstract

Abstract:

Firstly, a new main structure of three-phase decanter centrifuge with adjustable overflow weir plate was proposed, in which radial oil discharge channels and overflow weir plates with adjustable position and size were set up. Secondly, using the computational fluid dynamics software Fluent, based on the Euler-Eulerian multiphase flow model, the numerical simulation of the flow field and separation performance of the three-phase decanter centrifuge was carried out. The three-dimensional flow region model was established, and the meshing and boundary conditions were set. The oil phase and solid phase concentration distribution were analyzed. After that, the experimental process flow chart was determined, and an experimental system platform for oil-water-sand three-phase separation was built. In addition, the three-phase separation experimental system device was established, and the experimental steps were formulated for experimental research and measurement. The respective influence laws on the solid phase recovery rate, oil phase recovery rate, oil loss in filter cake and oil loss in water were studied from the rotating speed of the drum and the treatment capacity. Furthermore, the numerical simulation results were verified experimentally from the aspects of solid-contained of sand outlets, oil-contained of oil outlets, oil-contained of sand outlets, oil-contained mass concentration of water outlets.

Key words: three phase decanter centrifuge, centrifugation, multiphase flow, computational fluid dynamics, separation efficiency

摘要：

首先提出一种新型可调溢流堰板式三相卧螺离心机主体结构，其内部设置了径向排油通道以及位置和大小可调节的溢流堰板。其次，使用计算流体力学软件Fluent、基于欧拉-欧拉多相流模型，对三相卧螺离心机流场及分离性能进行数值模拟，建立三维流域模型、进行网格划分及边界条件设定，对油相及固相浓度分布等进行分析。之后确定实验工艺流程图，搭建油水砂三相分离实验系统平台，建立三相分离实验系统装置，制定实验步骤进行实验研究及测量工作。分别从转鼓转速、处理量等研究了各自对固相回收率、油相回收率、油在滤饼中的损失及油在水中的损失等的影响规律，并从出砂含固、出油含油、出渣含油及出水含油质量浓度等方面对数值模拟结果进行实验验证。

关键词: 三相卧螺离心机, 离心分离, 多相流, 计算流体力学, 分离效率

CLC Number:

TG231.4

ZHU Mingjun, HU Dapeng. Simulation and experimental analysis of the influence of operating parameters on oil-water-sand separation performance of three-phase decanter centrifuge[J]. Chemical Industry and Engineering Progress, 2022, 41(10): 5188-5199.

朱明军, 胡大鹏. 操作参数对三相卧螺离心机油水砂分离性能影响模拟及实验分析[J]. 化工进展, 2022, 41(10): 5188-5199.

Figures/Tables 15

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名称	数值	名称	数值
转鼓柱段外径D/mm	360	螺旋内筒（芯管）柱段直径d₁/mm	200
转鼓柱段长度L₁/mm	1107	溢流挡油板内径d₂/mm	260
转鼓锥段长度L₂/mm	513	BD挡油板外径d₃/mm	320
最大液池深度h₁/mm	45	进料管直径d_f/mm	45
螺旋叶片高度h₂/mm	78	螺旋导程S/mm	70
转鼓长径比	4.5∶1	转鼓半锥角α/（°）	7

名称	数值	名称	数值
转鼓柱段外径D/mm	360	螺旋内筒（芯管）柱段直径d₁/mm	200
转鼓柱段长度L₁/mm	1107	溢流挡油板内径d₂/mm	260
转鼓锥段长度L₂/mm	513	BD挡油板外径d₃/mm	320
最大液池深度h₁/mm	45	进料管直径d_f/mm	45
螺旋叶片高度h₂/mm	78	螺旋导程S/mm	70
转鼓长径比	4.5∶1	转鼓半锥角α/（°）	7

序号	转鼓转速 /r·min^-1	出油体积流率 /m³·h^-1	出水（滤清液）体积流率/m³·h^-1	出渣（滤饼）质量流率/kg·h^-1	出砂含固质量分数/%		出油含油质量分数/%		出渣含油质量分数/%		出水含油质量分数/%
序号	转鼓转速 /r·min^-1	出油体积流率 /m³·h^-1	出水（滤清液）体积流率/m³·h^-1	出渣（滤饼）质量流率/kg·h^-1	实验值	模拟值	实验值	模拟值	实验值	模拟值	实验值	模拟值
①	400	0.85	2.3	725	62	67	75	72	6.1	7.6	11	16
②	1000	0.89	2.1	739.5	65	68	78	79	5.3	7.5	9	14
③	1400	0.94	2.2	1032.7	64	68	76	80	5.6	6.8	8	13
④	1800	0.95	2.2	1138.6	68	70	77	82	4.6	6.3	7	11
⑤	2200	1.03	2.4	1242.3	74	82	78	83	4.4	6.2	9	11
⑥	2800	1.23	2.7	1143.5	78	85	83	86	4.1	5.8	9	9
⑦	3400	1.3	2.6	1347.6	82	86	79	87	3.8	5.3	5	8

序号	转鼓转速 /r·min^-1	出油体积流率 /m³·h^-1	出水（滤清液）体积流率/m³·h^-1	出渣（滤饼）质量流率/kg·h^-1	出砂含固质量分数/%		出油含油质量分数/%		出渣含油质量分数/%		出水含油质量分数/%
序号	转鼓转速 /r·min^-1	出油体积流率 /m³·h^-1	出水（滤清液）体积流率/m³·h^-1	出渣（滤饼）质量流率/kg·h^-1	实验值	模拟值	实验值	模拟值	实验值	模拟值	实验值	模拟值
①	400	0.85	2.3	725	62	67	75	72	6.1	7.6	11	16
②	1000	0.89	2.1	739.5	65	68	78	79	5.3	7.5	9	14
③	1400	0.94	2.2	1032.7	64	68	76	80	5.6	6.8	8	13
④	1800	0.95	2.2	1138.6	68	70	77	82	4.6	6.3	7	11
⑤	2200	1.03	2.4	1242.3	74	82	78	83	4.4	6.2	9	11
⑥	2800	1.23	2.7	1143.5	78	85	83	86	4.1	5.8	9	9
⑦	3400	1.3	2.6	1347.6	82	86	79	87	3.8	5.3	5	8

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