Design and application of new impeller-type wax-proof device based on speed-increasing wax-proof mechanism

Feng, Zi‐Ming; Sun, Yi; Liu, Xiaolei; Cui, Wei; Duan, Weibo

doi:10.1016/j.petrol.2021.108392

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…[4,13] In response to this problem, some antiwaxing methods, such as mechanical dewaxing, paraffin inhibitors, thermal dewaxing, the microbial method, equipment technology (including magnetic field dewaxing), and surface film layers, have been widely developed. [13,[46][47][48][49] Currently, it can be considered that a smooth and low energy surface is more likely to inhibit the wax adhering on the pipeline surface and the precipitated wax molecules are also not easy to adsorb and deposit and thus the antiwaxing purpose can be achieved. [50] In this case, a dedicated coating not only endows the pipeline with good antiwaxing function but also possesses a certain corrosion resistance, which can protect the pipeline with a "two birds with one stone" effect.…”

Section: Discussionmentioning

confidence: 99%

Insights into the Response Differences of Ultrasonic Rolled A3 Carbon Steels and 316L Stainless Steels to Scale and Wax Precipitation Behavior

Xue

Ren

Tao

et al. 2023

Cryst. Res. Technol.

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In this work, the antiscaling and antiwaxing properties are evaluated by surface roughness testing, water contact angle measurements, scale and wax deposition testing, and potentiodynamic polarization analysis, respectively. The morphologies and microstructures of the samples before and after ultrasonic surface rolling process (USRP) are analyzed by scanning electron microscopy and optical microscopy, respectively. The results show that for 316L stainless steel after USRP, its surface roughness and surface energy decrease by 97% and 27%, respectively, and the average scale amount is decreased by 73% and antiwaxing rate is up to 63%. In contrast, for the A3 steel after USRP, the average amount of scale and wax deposition increases due to the enhanced atomic activity of the surface layer and surface energy although its reduced surface roughness. It is found that the lower surface energy is the primary factor for improving the antiscaling and antiwaxing performance. A second factor may be related to the smooth surface and superior corrosion resistance.

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Section: Discussionmentioning

confidence: 99%

Insights into the Response Differences of Ultrasonic Rolled A3 Carbon Steels and 316L Stainless Steels to Scale and Wax Precipitation Behavior

Xue

Ren

Tao

et al. 2023

Cryst. Res. Technol.

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“…The law of conservation of mass states that the sum of the net masses flowing out of the microelement per unit time should be equal to the masses reduced in the microelement in the same time interval. 20,21 The expression for the conservation of mass equation is as follows 22 :…”

Section: Law Of Conservation Of Massmentioning

confidence: 99%

“…The law of conservation of mass states that the sum of the net masses flowing out of the microelement per unit time should be equal to the masses reduced in the microelement in the same time interval 20,21 . The expression for the conservation of mass equation is as follows 22 :

\frac{\partial ρ}{\partial t} + \frac{\partial false(ρ u false)}{\partial x} + \frac{\partial false(ρ v false)}{\partial y} + \frac{\partial false(ρ w false)}{\partial z} = 0

where ρ is the fluid density, kg/m 3 ; t is the time, s; u , v , w are velocity vector components in the x , y , and z directions, m/s.…”

Section: Mathematical Model Constructingmentioning

confidence: 99%

Flow field analysis of combustion fallout propensity test system based on CFD

Sang,

Dong,

et al. 2023

Adv Control Appl

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The flow field of the environment plays a crucial role in cigarette combustion cone fallout propensity test, with air velocity exhibiting a positive correlation with combustion volume. In order to minimize the impact of the environmental flow field on the test results, it is necessary to control the air speed within the range of 200 ± 30 mm/s in the test area of each tobacco test channel. To address this concern, which used the Realizable k‐ε model to develop a mathematical model of the testing environment. The uniformity of air speed in each channel and its relationship with structural parameters were then analyzed. Based on these findings, the key structural parameters of the ventilation hood are optimized. After restimulated the optimized model, the results demonstrate a higher level of uniformity in the environmental flow field of the optimized section. To validate the accuracy of the simulation results, measurements indicated that the maximum air speed value at all points is 225.6 mm/s, while the minimum value is 178.44 mm/s. These values fall within the specified range of 200 ± 30 mm/s, thus meeting the design requirements. This study ensures that the cigarette can burn in a steady state during the cigarette combustion fallout propensity test and improves the stability of the cigarette combustion cone drop tendency test results.

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“…The mass conservation equation , of the flow model is where ρ is the fluid density, given in kilograms per cubic meter; t is the flow time, given in seconds; and u , v , and w are velocity components in x , y and z directions, given in meters per second.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Momentum conservation equations , are as follows where F x , F y , and F z are the stresses received by the fluid element in the x , y , and z directions, given in kilograms per squared meter per squared second. When the stress is gravity only, F x = 0, F y = 0, and F z = −ρ g .…”

Section: Numerical Simulationmentioning

confidence: 99%

Chaotic Mixing Intensification and Flow Field Evolution Mechanism in a Stirred Reactor Using a Dual-Shaft Eccentric Impeller

Yao

Tang

Liu

et al. 2022

Ind. Eng. Chem. Res.

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Nearly 95% of the energy in the stirred reactor maintains the symmetrical flow field structure formed by fluid rotation, which reduces the efficiency of fluid transfer. In this paper, a dual-shaft eccentric impeller based on the Rushton turbine (RT) and pitched blade Rushton turbine (PBRT) was proposed to eliminate the stable symmetrical flow field structure in the mixing tank and improve the fluid transfer efficiency and chaotic mixing degree. The effects of impeller types, the height difference between impellers, and shaft eccentricity on the single-phase flow field were researched. The power consumption, mixing time, chaotic characteristic parameter the largest Lyapunov exponents, flow field structure evolution, and fluid velocity of different dual-shaft eccentric impeller systems were also investigated through experiments and computational fluid dynamics simulation. Results showed that changing the impeller types and height difference on different shafts could improve the mixing efficiency at a lower power consumption incremental level. Meanwhile, both visual experiments and numerical simulation analysis demonstrate that the reasonable combination of the above two variables can make full use of the advantages of different impellers, strengthen the fluid transfer, destroy the symmetrical structure of the flow field in the stirred reactor, and enhance the energy dissipation of the system through the fluid transfer effect between blades and the coupling effect of height difference, which is conducive to improving the mixing efficiency of the system.

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Design and application of new impeller-type wax-proof device based on speed-increasing wax-proof mechanism

Cited by 4 publications

References 14 publications

Insights into the Response Differences of Ultrasonic Rolled A3 Carbon Steels and 316L Stainless Steels to Scale and Wax Precipitation Behavior

Insights into the Response Differences of Ultrasonic Rolled A3 Carbon Steels and 316L Stainless Steels to Scale and Wax Precipitation Behavior

Flow field analysis of combustion fallout propensity test system based on CFD

Chaotic Mixing Intensification and Flow Field Evolution Mechanism in a Stirred Reactor Using a Dual-Shaft Eccentric Impeller

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