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Qiu S, Zhong L, Wang G, Fang X, Yang Y, Liu Q. Effect of Structural Parameters on the Performance of Axial-Flow Inlet Hydrocyclones for In Situ Desanding from Natural Gas Hydrate Mixed Slurry. ACS OMEGA 2023; 8:28531-28542. [PMID: 37576684 PMCID: PMC10413446 DOI: 10.1021/acsomega.3c02920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 07/11/2023] [Indexed: 08/15/2023]
Abstract
Structural parameters play a decisive role in the performance of hydrocyclones for in situ natural gas hydrate (NGH) recovery and desanding. In this paper, the effects of key structural parameters on its performance were investigated by numerical simulations and experimental methods. The results show that the most influential factors are the spiral pitch of the spiral inlet, the vortex finder diameter, and the spigot diameter. The second most influential factors are the spiral turn number and the cone angle. Other parameters have the least influence. Specifically, the NGH recovery efficiency and pressure drop increase, but desanding efficiency decreases as d0/D and the cone angle increase. The NGH recovery efficiency and pressure drop decrease and desanding efficiency increases as ds/D increases. Therefore, it is necessary to choose a suitable value to balance the efficiency and pressure drop to improve the performance, for example, selecting the appropriate diameter ratio of the vortex finder and spigot. The above results can be used for the engineering design of in situ separators in marine hydrate mining and further realize in situ desanding, NGH recovery, and sand backfilling.
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Affiliation(s)
- Shunzuo Qiu
- Department
of International Applied Technology, Yibin
University, Yibin 644000, China
| | - Lin Zhong
- Department
of Mechatronic Engineering, Southwest Petroleum
University, Chengdu 610500, China
| | - Guorong Wang
- Department
of Mechatronic Engineering, Southwest Petroleum
University, Chengdu 610500, China
| | - Xing Fang
- Department
of Mechatronic Engineering, Southwest Petroleum
University, Chengdu 610500, China
| | - Yan Yang
- Department
of International Applied Technology, Yibin
University, Yibin 644000, China
| | - Qin Liu
- Department
of International Applied Technology, Yibin
University, Yibin 644000, China
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Qiu S, Wang T, Wang G, Zhong L, Fang X. Effect of Spiral Inlet Geometric Parameters on the Performance of Hydrocyclones Used for In Situ Desanding and Natural Gas Hydrate Recovery in the Subsea. ACS OMEGA 2023; 8:5426-5436. [PMID: 36816650 PMCID: PMC9933186 DOI: 10.1021/acsomega.2c06582] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
The inlet structure of hydrocyclones has great impact on performance. In this paper, the effects of spiral inlet geometric parameters on the flow field characteristics and separation performance were investigated by CFD. Numerical results show that the pitch has the largest influence, followed by the heads, the turns, and the steady flow cone. With the increase of the steady flow cone angle, the turbulence intensity increases. The efficiency, pressure drop, tangential velocity, sand volume fraction at the spigot, and natural gas hydrate (NGH) volume fraction at the vortex finder decrease, when the pitch increases. With the increase of the number of heads and turns, the efficiency, pressure drop, tangential velocity, the NGH volume fraction at the vortex finder, and the sand volume fraction at the spigot increase. The efficiency and pressure drop of hydrocyclones with the optimal parameters are 90% and 0.05 MPa, respectively. Therefore, the performance of the NGH hydrocyclone can be improved by increasing the inlet pitch and the number of spiral heads and inlet spiral turns. The results provide theoretical guidance for the engineering design of NGH in situ separators.
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Affiliation(s)
- Shunzuo Qiu
- Department
of International Applied Technology, Yibin
University, Yibin644000, China
| | - Teng Wang
- Department
of Mechanical and Electrical Engineering, Sichuan College of Architectural Technology, Deyang618030, China
| | - Guorong Wang
- Department
of Mechatronic Engineering, Southwest Petroleum
University, Chengdu610500, China
| | - Lin Zhong
- Department
of Mechatronic Engineering, Southwest Petroleum
University, Chengdu610500, China
| | - Xing Fang
- Department
of Mechatronic Engineering, Southwest Petroleum
University, Chengdu610500, China
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Influence of Feed Rate on the Performance of Hydrocyclone Flow Field. SEPARATIONS 2022. [DOI: 10.3390/separations9110349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In order to clarify the influence of feed rate on a hydrocyclone flow field, numerical simulation was employed to model the influence of feed rate on the pressure field, velocity field, air column, turbulent kinetic energy, and split ratio. The results revealed that static pressure, tangential velocity, and radial velocity increased with an increase in the feed rate. When the feed rate at the inlet increases from 1 m/s to 5 m/s, the static pressure increases from 5.49 kPa to 182.78 kPa, tangential velocity increases from 1.97 m/s to 11.16 m/s, and radial velocity increases from 0.20 m/s to 1.16 m/s demonstrating that a high feed rate facilitated the strengthening separation of the flow field. Meanwhile, with the increase in the feed rate, the split ratio of the hydrocyclone decreased, indicating that the concentration effect of the hydrocyclone improved. Additionally, the formation time of the air column was reduced, and the flow field became more stable. Nevertheless, the axial velocity and the turbulent kinetic energy also increased with the increase in the feed rate, and the increase in the axial velocity reduced the residence time of the material in the hydrocyclone, which was not conducive to the improvement of separation accuracy. In addition, the increase in turbulent kinetic energy led to an increase in energy consumption, which was not conducive to the improvement of the comprehensive performance of the hydrocyclone. Therefore, choosing an appropriate feed rate is of great significance to the regulation of the flow field and the improvement of hydrocyclone separation performance.
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Qian Y, Xu J, Yuan H, Peng C, Zhou F. Study on the Hydrocyclonic Separation of Natural Gas Hydrate Slurries Combined with the Solution of Particles’ Settling Equation. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuchen Qian
- School of Mechanical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
- Jiangsu Key Laboratory of Green Process Equipment, Changzhou 213164, Jiangsu, China
| | - Jun Xu
- Sinopec Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China
| | - Huixin Yuan
- School of Mechanical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
- Jiangsu Key Laboratory of Green Process Equipment, Changzhou 213164, Jiangsu, China
| | - Chong Peng
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Faqi Zhou
- School of Mechanical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
- Jiangsu Key Laboratory of Green Process Equipment, Changzhou 213164, Jiangsu, China
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Fang X, Wang G, Zhong L, Qiu S, Wang D. A CFD–DEM analysis of the de-cementation behavior of weakly cemented gas hydrate–bearing sediments in a hydrocyclone separator. PARTICULATE SCIENCE AND TECHNOLOGY 2022. [DOI: 10.1080/02726351.2021.2017087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Xing Fang
- School of Mechanical Engineering, Southwest Petroleum University, Chengdu, China
| | - Guorong Wang
- School of Mechanical Engineering, Southwest Petroleum University, Chengdu, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang, China
| | - Lin Zhong
- School of Mechanical Engineering, Southwest Petroleum University, Chengdu, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang, China
| | - Shunzuo Qiu
- Chinesisch-Deutsches Hochschulkolleg (CDHK), Yibin University, Yibin, China
| | - Dangfei Wang
- School of Mechanical Engineering, Southwest Petroleum University, Chengdu, China
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Fang X, Wang G, Zhong L, Qiu S, Wang D. Adaptability analysis of operating parameters of hydrate hydrocyclone separator based on a CFD simulation. SEP SCI TECHNOL 2021. [DOI: 10.1080/01496395.2021.1954662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Xing Fang
- School of Mechanical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China
| | - Guorong Wang
- School of Mechanical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang, Guangdong, China
| | - Lin Zhong
- School of Mechanical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang, Guangdong, China
| | - Shunzuo Qiu
- International Faculty of Applier Technology, Yibin University, Yibin, Sichuan, PR China
| | - Dangfei Wang
- School of Mechanical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China
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Experimental and Theoretical Study on the Critical Breaking Velocity of Marine Natural Gas Hydrate Sediments Breaking by Water Jet. ENERGIES 2020. [DOI: 10.3390/en13071725] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Water jet technology is a key technology in the marine natural gas hydrate (NGH) solid fluidization mining method. As an important parameter in water jet breaking NGH sediments technology, the critical breaking velocity of NGH sediments is unknown. In the present research, an orthogonal design experiment is carried out to study the critical velocity of NGH breakage by water jet, using frozen soil and sand as experimental samples. First, the time it takes to reach maximum NGH breaking depth is determined. Then, ultimate breaking distance is studied with respect to the NGH saturation, jet pressure, and nozzle diameter. Following that, the variation of critical velocity with NGH saturation is analyzed. Eventually, a formula to calculate the critical velocity for marine NGH breakage by water jet process is established, and the undetermined coefficient (η) in the formula is calibrated with the experiment data. The results show that the ultimate breaking distance is mostly achieved within 63 s. The three experimental factors in order of the effect on the ultimate breaking depth (from high to low) are NGH saturation, jet pressure, and nozzle diameter. The critical velocities for marine NGH breakage corresponding to the NGH saturations of 20%, 40,%, 6%, and 80% are 5.71 m/s, 7.14 m/s, 9.60 m/s, and 10.85 m/s, respectively. The undetermined coefficient η in critical velocity formula is 1.44 m/s.
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