The electromagnetic separation method is a new approach to treat ship-based marine oily wastewater,in which oil droplets are dispersed in seawater(oil-seawater mixed flow).In order to clarify the separation process an...The electromagnetic separation method is a new approach to treat ship-based marine oily wastewater,in which oil droplets are dispersed in seawater(oil-seawater mixed flow).In order to clarify the separation process and determine the separation characteristics,the flow field and volume fraction of the oil droplets of the oil-seawater mixed flow under an applied electromagnetic field with different operating conditions were investigated by 2D numerical simulations with the Eulerian model.The results show that:(1)the downward Lorentz force causes seawater to flow downwards and the oil droplets to move upwards due to the electromagnetic separation force in the effective section of the separation channel;(2)the volume fraction of the oil droplets at the top of the outlet section increases with the current density,magnetic field,and the diameter of the oil droplet and decreases with the inlet velocity of the oily seawater.The results provide useful guidance for the design of electromagnetic separation devices of the oil-seawater mixed flow.展开更多
The Albian age Burgan Formation is one of the most important siliciclastic reservoirs in the Arabian Plate. Northwest of Persian Gulf is the main area in Iran invaded by these siliciclastic sediments. This study uses ...The Albian age Burgan Formation is one of the most important siliciclastic reservoirs in the Arabian Plate. Northwest of Persian Gulf is the main area in Iran invaded by these siliciclastic sediments. This study uses a new and comprehensive procedure to identify the reservoir characteristics of the Burgan Formation in Soroush oil field (NW Persian Gulf). Results from core and petrographic studies led identification of 7 microfacies (MF1 to MF7) that are grouped into 3 main facies association (FA1, to FA3). Results from reservoir characterization indicate a dramatic decrease in reservoir quality from bottom to top (FA1 toward FA3). Using the Flow Zone Indicator (FZI) method, 5 Hydraluic flow units (HFUs) were recognized in the formation. The HFUs are in a notable accordance with facies associations. The HFUs 1 and 2 correlate with theFA1, the HFUs 3 and 4 with the FA2 and the HFU5 cover intervals defined by FA3. Cluster analysis of wireline logs resulted in determination of 5 electrofacies (EF1 to EF5) which are in agreement with the ascertained HFUs. Inspecting the vertical distribution of FAs, HFUs and EFs, three distinct zones are determined. The lower zone is characterized by good reservoir quality, abundance of FA1, HFUs1 and 2 and also EFs 1 and 2 is observed there. The middle zone with a moderate reservoir quality and upper zone presents the poorest quality. In the middle zone FA2, HFUs3 and 4 and also EFs 3 and 4 are more abundant while in the upper one interval are clearly correlated with FA3, HFU5 and also EF5.展开更多
This paper presents a novel capacitance probe,i.e.,parallel-wire capacitance probe(PWCP),for two-phase flow measurement.Using finite element method(FEM),the sensitivity field of the PWCP is investigated and the optimu...This paper presents a novel capacitance probe,i.e.,parallel-wire capacitance probe(PWCP),for two-phase flow measurement.Using finite element method(FEM),the sensitivity field of the PWCP is investigated and the optimum sensor geometry is determiend in term of the characterisitc parameters.Then,the response of PWCP for the oil-water stratified flow is calculated,and it is found the PWCP has better linearity and sensitivity to the variation of water-layer thickness,and is almost independant of the angle between the oil-water interface and the sensor electrode.Finally,the static experiment for oil-water stratified flow is carried out and the calibration method of liquid holdup is presented.展开更多
有载分接开关(on-load tap changer,OLTC)机构快速动作不可避免地会产生气泡,容易在OLTC级间部位诱发局部放电。该文针对气泡在OLTC主触头级间形变及电场畸变特性开展研究。首先,构建包含气泡及变压器油的OLTC主触头气液两相流模型,对...有载分接开关(on-load tap changer,OLTC)机构快速动作不可避免地会产生气泡,容易在OLTC级间部位诱发局部放电。该文针对气泡在OLTC主触头级间形变及电场畸变特性开展研究。首先,构建包含气泡及变压器油的OLTC主触头气液两相流模型,对主触头级间电场进行仿真,通过Kerr效应的光电试验平台验证了仿真结果。然后,以OLTC实际工况作为边界条件,研究油温、气泡体积、变压器油流量对气泡形变及电场分布的影响。结果显示,毫米级气泡在经过OLTC级间时经历多次拉伸及形状恢复,其长短轴比大于1.5,气泡引起OLTC级间场强增大10%左右。当OLTC油室内变压器油流的流量达到7L/min时,经过级间的气泡开始出现破裂,形成内部场强相近的两枚子气泡。级间场强达到气泡击穿场强时,两枚气泡均可能发生放电,从而增大了油隙放电的概率。该文的研究内容与结论可为后续OLTC设计及运行提供有益参考。展开更多
基金The Tianjin Science and Technology Plan Project under contract No.15YFYSGX00010the Tianjin Bureau of Marine Science and Technology Plan Project under contract No.KJXH2015-05
文摘The electromagnetic separation method is a new approach to treat ship-based marine oily wastewater,in which oil droplets are dispersed in seawater(oil-seawater mixed flow).In order to clarify the separation process and determine the separation characteristics,the flow field and volume fraction of the oil droplets of the oil-seawater mixed flow under an applied electromagnetic field with different operating conditions were investigated by 2D numerical simulations with the Eulerian model.The results show that:(1)the downward Lorentz force causes seawater to flow downwards and the oil droplets to move upwards due to the electromagnetic separation force in the effective section of the separation channel;(2)the volume fraction of the oil droplets at the top of the outlet section increases with the current density,magnetic field,and the diameter of the oil droplet and decreases with the inlet velocity of the oily seawater.The results provide useful guidance for the design of electromagnetic separation devices of the oil-seawater mixed flow.
文摘The Albian age Burgan Formation is one of the most important siliciclastic reservoirs in the Arabian Plate. Northwest of Persian Gulf is the main area in Iran invaded by these siliciclastic sediments. This study uses a new and comprehensive procedure to identify the reservoir characteristics of the Burgan Formation in Soroush oil field (NW Persian Gulf). Results from core and petrographic studies led identification of 7 microfacies (MF1 to MF7) that are grouped into 3 main facies association (FA1, to FA3). Results from reservoir characterization indicate a dramatic decrease in reservoir quality from bottom to top (FA1 toward FA3). Using the Flow Zone Indicator (FZI) method, 5 Hydraluic flow units (HFUs) were recognized in the formation. The HFUs are in a notable accordance with facies associations. The HFUs 1 and 2 correlate with theFA1, the HFUs 3 and 4 with the FA2 and the HFU5 cover intervals defined by FA3. Cluster analysis of wireline logs resulted in determination of 5 electrofacies (EF1 to EF5) which are in agreement with the ascertained HFUs. Inspecting the vertical distribution of FAs, HFUs and EFs, three distinct zones are determined. The lower zone is characterized by good reservoir quality, abundance of FA1, HFUs1 and 2 and also EFs 1 and 2 is observed there. The middle zone with a moderate reservoir quality and upper zone presents the poorest quality. In the middle zone FA2, HFUs3 and 4 and also EFs 3 and 4 are more abundant while in the upper one interval are clearly correlated with FA3, HFU5 and also EF5.
基金Supported by the National Natural Science Foundation of China （50974095, 41174109, 61104148）, and the National Science and Technology Mai or Projects （2011ZX05020-006）.
文摘This paper presents a novel capacitance probe,i.e.,parallel-wire capacitance probe(PWCP),for two-phase flow measurement.Using finite element method(FEM),the sensitivity field of the PWCP is investigated and the optimum sensor geometry is determiend in term of the characterisitc parameters.Then,the response of PWCP for the oil-water stratified flow is calculated,and it is found the PWCP has better linearity and sensitivity to the variation of water-layer thickness,and is almost independant of the angle between the oil-water interface and the sensor electrode.Finally,the static experiment for oil-water stratified flow is carried out and the calibration method of liquid holdup is presented.
文摘有载分接开关(on-load tap changer,OLTC)机构快速动作不可避免地会产生气泡,容易在OLTC级间部位诱发局部放电。该文针对气泡在OLTC主触头级间形变及电场畸变特性开展研究。首先,构建包含气泡及变压器油的OLTC主触头气液两相流模型,对主触头级间电场进行仿真,通过Kerr效应的光电试验平台验证了仿真结果。然后,以OLTC实际工况作为边界条件,研究油温、气泡体积、变压器油流量对气泡形变及电场分布的影响。结果显示,毫米级气泡在经过OLTC级间时经历多次拉伸及形状恢复,其长短轴比大于1.5,气泡引起OLTC级间场强增大10%左右。当OLTC油室内变压器油流的流量达到7L/min时,经过级间的气泡开始出现破裂,形成内部场强相近的两枚子气泡。级间场强达到气泡击穿场强时,两枚气泡均可能发生放电,从而增大了油隙放电的概率。该文的研究内容与结论可为后续OLTC设计及运行提供有益参考。
