Experimental Study on a Novel Axial Separator for Oil–Water Separation

Fan, Guangming; Zhao, Lei; Zhao, Weiguang; Hou, Mingwen; Zhu, Fuqiang; Yan, Changqi

doi:10.1021/acs.iecr.0c03913

Cited by 22 publications

(9 citation statements)

References 36 publications

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“…The sketches of the settling tanks is shown in Figure a,b. The details of the settling tanks can be found in our other work . The oil is fully settled and reused after passing through the separator to ensure the stability of the inlet mixture.…”

Section: Methodsmentioning

confidence: 99%

“…Campen 29 similar swirler with Delft cyclone is used in the axial separator, while the light-phase outlet is placed downstream 5 Liu 30 the body of this separator is similar to the conventional separator, while the curved blades serve as a swirler to establish swirling flow 6 Hamza 31 similar structure with the one proposed by Van Campen, but a conical tube is used in the swirl chamber 7 Kou 33 similar structure with separator investigated by Hamza, but the outlet for the light phase is placed inside the guide vanes The details of the settling tanks can be found in our other work. 35 The oil is fully settled and reused after passing through the separator to ensure the stability of the inlet mixture. Besides, the data in the experiments was collected by a data acquisition system.…”

Section: Experimental Systemmentioning

confidence: 99%

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Experimental Investigation on a New Axial Separator for Oil–Water with Small Density Difference

Zhao

Fan

Zhang

et al. 2021

Ind. Eng. Chem. Res.

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Hydrocyclones play an important role in pre-separation downhole to decrease the water content of produced liquids. While the structural feature of tangential inlet limits the further improvement of separation efficiency. Therefore, the axial separator has emerged as the potential alternative due to its low swirl turbulence, easy installation, and low energy consumption. Since the first proposition of axial separators, several designs have been introduced. They are used for two fluids with more than a 100 kg/m 3 density difference. However, there are some situations where the oil density is above 900 kg/m 3 and their densities are closer. In this paper, a new axial separator was introduced, and the separation performance was investigated experimentally using gear oil with 920 kg/m 3 density and tap water. The results show that the separator keeps high separation efficiency, and the oil concentration in heavy phase outlet is below 500 mg/ L in experimental conditions where water flow rate ranges from 3 to 7 m 3 /h and oil fraction ranges from 1 to 10%. Additionally, higher inlet flow rate and larger oil fraction lead to an increase of oil concentration. Also, the split ratio should be kept in a reasonable range to acquire the best separation performance.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Systemmentioning

confidence: 99%

Experimental Investigation on a New Axial Separator for Oil–Water with Small Density Difference

Zhao

Fan

Zhang

et al. 2021

Ind. Eng. Chem. Res.

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“…This is mainly because the increase of the inlet velocity led to the increase of tangential velocity of the two-phase vapor in the swirl chamber. The centrifugal force of tar vapor was further increased, and more tar vapor was thrown to the outside of the swirl, and then flowed, attached to the wall [33].…”

Section: Volume Distribution Characteristics Of Tar Vapormentioning

confidence: 99%

Modeling and Numerical Simulation of the Inlet Velocity on Oil–Water Two-Phase Vapor Separation Efficiency by the Hydrocyclone

Zhao

Sun²,

Wang³

et al. 2022

Energies

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The density of tar vapor and water vapor produced by coal pyrolysis is different. Different centrifugal forces will be generated when they flow through the hydrocyclone. The water vapor and tar vapor are divided into inner and outer layers. According to this phenomenon, the moisture in the tar can be removed. In this paper, a Eulerian gas–liquid two-phase flow model is established by numerical simulation to study the effect of inlet velocity on the separation effect of a designed hydrocyclone (split ratio 0.2). The results show that the inlet velocity and moisture content have an influence on the volume distribution characteristics, tangential velocity, axial velocity, pressure drop distribution, and separation efficiency of tar vapor and water vapor in the hydrocyclone. When the inlet velocity increases from 2.0 to 12.0 m/s, the central swirl intensity increases, and the negative pressure sweep range at the overflow outlet increases. The axial velocity increased from 2.8 to 14.9 m/s, tar vapor content at the overflow outlet decreased from 74% to 37%, and at the underflow outlet increased from 89% to 92%. When the moisture content is lower than 10%, the hydrocyclone with the split ratio of 0.20 is no longer suitable for the separation of oil–water two-phase vapor. However, when the water content is higher than 20%, the purity of tar vapor at the underflow outlet can reach 92%, and the overflow outlet needs multistage separation to realize tar purification.

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“…To run the oil and gas industry, different expertise areas are involved. , For example, studies related to drilling, − completion, hydraulic fracturing, , enhanced oil recovery, , acidizing, organic deposition inhibition, − inorganic deposition inhibition, , and the demulsification process − are relevant to optimize the oil production. Nevertheless, the quality of water that is discarded or reinjected plays an important role not only in the oil business as a whole but also in the issues related to environmental aspects. − Moreover, the treatment of oil-spilled seawater is a challenge around the world, adding motivation to the research on oil–water separation. − …”

Section: Introductionmentioning

confidence: 99%

Correlation between Methods to Determine Total Oil and Grease in Synthetic Oily Water Using Heavy Oil: Gravimetry vs Fluorimetry

Silva

Melchuna³

et al. 2022

Ind. Eng. Chem. Res.

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The determination of total oil and grease (TOG) in water is important mainly for the petroleum industry due to the high amount of water coproduced with oil. Many countries establish regulations determining a maximum limit of TOG. In Brazil, for example, TOG should be measured by gravimetric methods. Other methodologies may be accepted when providing statistical correlation with the gravimetric method, which is extremely laborious, takes a long time to be performed, provokes great losses of material, produces relatively large standard deviations, and cannot be used in offshore oil platforms. Spectroscopy methods, such as fluorimetry, can be used as a simpler alternative to determine TOG. However, consent of the regulation agency to use other methods requires an accurate statistical correlation between their results. In this work, TOG values determined by the gravimetric method (using two different extraction solvents: n-hexane and xylene) and fluorimetry (using n-hexane as the extraction solvent) were compared for oily water in the theoretical oil concentration range of 10 to 100 ppm, using a heavy oil to prepare the oily water. Good correlations were obtained for both gravimetry vs fluorimetry, both using n-hexane (R 2 = 0.9630), and gravimetry using xylene vs fluorimetry using n-hexane (R 2 = 0.9857). Moreover, TOG measured by fluorimetry was closer to the real oil concentrations. Therefore, although a specific correlation must be obtained for each kind of crude oil, fluorimetry is a simple, fast, and accurate method, and the correlation is relatively simple to obtain.

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Experimental Study on a Novel Axial Separator for Oil–Water Separation

Cited by 22 publications

References 36 publications

Experimental Investigation on a New Axial Separator for Oil–Water with Small Density Difference

Experimental Investigation on a New Axial Separator for Oil–Water with Small Density Difference

Modeling and Numerical Simulation of the Inlet Velocity on Oil–Water Two-Phase Vapor Separation Efficiency by the Hydrocyclone

Correlation between Methods to Determine Total Oil and Grease in Synthetic Oily Water Using Heavy Oil: Gravimetry vs Fluorimetry

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