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Numerical Study of Heat Transfer Characteristic for Subcooled Falling Film outside the Shaped Tubes under Rolling Motion

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Journal of Thermal Science 2023年第3期32卷 922-932页

作者： HAN Hui WANG Junqi WANG Shaowei LI Yuxing provincial key laboratory of oil and gas storage and transportation safety in Shandong Province China University of Petroleum(Huadong)Qingdao 266580China

The heat transfer performance of spiral wound heat exchanger used in the floating liquefied natural gas(FLNG)may be significantly affected by the sloshing *** this paper,a three-dimensional numerical model combined with the dynamic mesh technology is conducted to study subcooled falling film heat transfer under static and sloshing *** three-dimensional velocity distribution of the liquid film on the shell side is *** effects of cross-section shape of heat exchange tubes,Reynolds numbers and sloshing parameters on heat transfer characteristics are *** results indicate that the heat transfer performance of the egg-shaped tube is superior to that of the elliptical and circular tube under both static and sloshing conditions due to significant heat transfer improvement in the lower half of the *** heat transfer coefficients of three different kinds of tubes decrease under sloshing *** the rolling amplitude is 6°,the average heat transfer coefficients of the circular tube,elliptical tube and egg-shaped tube are reduced by 2.1%,3.7%and 4.9%*** the current sloshing parameters,increasing the rolling amplitude,the heat transfer coefficients of three different tubes are slightly increased,while the sloshing period has little effect on heat *** egg-shaped tube and elliptical tube are greatly affected by sloshing motion at the low Reynolds number,while the effect is relatively small at the high Reynolds number.

关键词： falling film flow sloshing condition spiral wound heat exchanger floating liquefied natural gas

Research on the falling film flow and heat transfer characteristics of FLNG spiral wound heat exchanger under sea conditions

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Petroleum Science 2022年第3期19卷 1276-1290页

作者： Chong-Zheng Sun Liang Liu Yu-Xing Li Jian-Lu Zhu College of Pipeline and Civil Engineering/Shandong provincial key laboratory of oil&gas storage and transportation safety/Qingdao key laboratory of Circle Sea oil&gas storage and transportation Technology China University of PetroleumQingdaoShandong266580China

As the key equipment of floating liquefied natural gas(FLNG)process,the performance of spiral wound heat exchanger(SWHE)influences operation costs and reliability of the whole *** sea conditions destroy the falling film flow state of the refrigeration and then affect the heat transfer performance of FLNG *** order to design and optimize the SWHE,a cryogenic experimental device of FLNG process and a numerical model of falling film flow have been constructed to study the effects of sea conditions on the falling film flow and heat transfer characteristics of *** cryogenic experimental results show that the pitching conditions have larger effects on the heat transfer performance than *** the pitching angle of 7°,the natural gas temperature and gaseous refrigerant temperature increase by 3.22°C and 7.42°C,*** flow rates of refrigerant and feed natural gas have a great impact on the heat transfer performance of SWHE under pitching and compound sloshing *** the tilt angle increases to 9°,the tube structure with outer diameter D=8 mm and pipe spacing S=4 mm is recommended to reduce the drying area of the pipe wall surface.

关键词： FLNG Spiral wound heat exchanger Falling film flow Cryogenic heat transfer Sea condition

Hydrate formation in oil–water systems: Investigations of the influences of water cut and anti-agglomerant

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Chinese Journal of Chemical Engineering 2020年第2期28卷 369-377页

作者： Guangchun Song Yuxing Li Wuchang Wang Kai Jiang Zhengzhuo Shi Shupeng Yao Shandong Province key laboratory of oil-gas storage and transportation safety China University of PetroleumQingdao 266580China

To investigate the characteristics of hydrate formation in oil–water systems, a high-pressure cell equipped with visual windows was used where a series of hydrate formation experiments were performed from natural gas + diesel oil + water systems at different water cuts and anti-agglomerant concentrations. According to the temperature and pressure profiles in test experiments, the processes of hydrate formation under two kinds of experimental procedures were analyzed first. Then, based on the experimental phenomena observed through the visual windows, the influences of water cut and anti-agglomerant on the places of hydrate formation and distribution, hydrate morphologies and hydrate morphological evolvements were investigated. Hydrate agglomeration, hydrate deposition and hydrate film growth on the wall were observed in experiments. Furthermore, three different mechanisms for hydrate film growth on the wall were identified. In addition, the influences of water cut and anti-agglomerant on the induction time of hydrate formation were also studied.

关键词： Hydrates Formation oil–water system Water cut Anti-agglomerant

Hydrate agglomeration modeling and pipeline hydrate slurry flow behavior simulation

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Chinese Journal of Chemical Engineering 2019年第1期27卷 32-43页

作者： Guangchun Song Yuxing Li Wuchang Wang Kai Jiang Zhengzhuo Shi Shupeng Yao Shandong key laboratory of oil-gas storage and transportation safety College of Pipeline and Civil EngineeringChina University of Petroleum

Dynamic modeling and numerical simulation of hydrate slurry flow behavior are of great importance to offshore hydrate *** this purpose, a dynamic model of hydrate agglomeration was proposed in this *** on population balance equation, the frame of the dynamic model was established first, which took both hydrate agglomeration and hydrate breakage into ***, the calculating methods of four key parameters involved in the dynamic model were given according to hydrate agglomeration *** four key parameters are collision frequency, agglomeration efficiency, breakage frequency and the size distribution of sub particles resulting from particle *** the whole dynamic model was built, it was combined with several traditional solid–liquid flow models and then together solved by the CFD software FLUENT ***, using this method, the influences of flow rate and hydrate volume fraction on hydrate particle size distribution, hydrate volume concentration distribution and pipeline pressure drop were simulated and analyzed.

关键词： Hydrate Agglomeration Flow behavior Dynamic model Numerical simulation Population balance

Effect of existence state of asphaltenes on the asphaltenes-wax interaction in wax deposition

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Petroleum Science 2023年第1期20卷 507-514页

作者： Yun Lei Han Wang Shuang-Shuang Li Xue-Qian Liu Hao-Ran Zhu Yu-Ming Gao Hao-Ping Peng Peng-Fei Yu Jiangsu key laboratory of oil and gas storage&transportation Technology Changzhou UniversityJiangsu213164China

Asphaltenes are the most elusive substances in waxy crude oil,especially the complex structures,which leads to significant precipitation and aggregation characteristics of asphaltenes,and affects the asphaltenes-wax *** this study,the concept of the existence state of asphaltenes was introduced to semi-quantitatively investigate the precipitation and aggregation characteristics of *** this basis,the influence of the existence state of asphaltenes on wax deposition was studied by coldfinger device and high-temperature gas chromatography,and the composition and properties of the deposits were *** main findings were made:(1)As the asphaltene concentration increases,the existence state of asphaltenes gradually transitions from dispersed state to aggregated state,and the asphaltene concentration of 0.30 wt%in this study is the starting point of the transition.(2)The existence state of asphaltenes in crude oil does affect the process of wax deposition,as shown in the fact that the dispersed asphaltenes promote the occurrence of wax deposition,while the aggregated asphaltenes can inhibit wax deposition.(3)In the presence of the aggregated asphaltenes,that is,when the asphaltene concentration is higher than 0.30 wt%,the shedding phenomenon of deposit layer was observed,and with the increase of aggregated asphaltenes,the deposit layer fell off earlier.(4)With the increase of the dispersed asphaltenes,the wax appearance temperature(WAT)and wax content of the deposits all showed an increasing trend,while with the appearance of the aggregated asphaltenes,the above situation was *** findings of this study can help for better understanding of the interaction between the asphaltenes and wax in wax deposition.

关键词： Asphaltenes Precipitation/aggregation Existence state of asphaltenes Deposition

Investigation on hydrate growth at the oil–water interface:In the presence of asphaltene

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Chinese Journal of Chemical Engineering 2022年第5期35卷 211-218页

作者： Guangchun Song Yuanxing Ning Yuxing Li Wuchang Wang Shandong key laboratory of oil-gas storage and transportation safety College of Pipeline and Civil EngineeringChina University of PetroleumQingdao 266580China State key laboratory of Natural gas Hydrates Beijing 100028China

Natural gas hydrates can readily form in deep-water oil production processes and pose a great threat to the oil ***,the coexistence of hydrate and asphaltene can result in more severe challenges to subsea flow *** order to study the effects of asphaltene on hydrate growth at the oil-water interface,a series of micro-experiments were conducted in a self-made reactor,where hydrates nucleated and grew on the surface of a water droplet immersed in asphaltene-containing *** on the micro-observations,the shape and growth rate of the hydrate shell formed at the oil-water interface were mainly investigated and the effects of asphaltene on hydrate growth were *** to the experimental results,the shape of the water droplet and the interfacial area changed significantly after the formation of the hydrate shell when the asphaltene concentration was higher than a certain value.A mechanism related to the reduction of the interfacial tension caused by the absorption of asphaltenes on the interface was proposed for ***,the growth rate of the hydrate shell decreased significantly with the increasing asphaltene concentration under experimental *** conclusions of this paper could provide preliminary insight how asphaltene affect hydrate growth at the oil-water interface.

关键词： Hydrate Asphaltene Interface Growth Shape

Numerical and experimental study on the falling film flow characteristics with the effect of co-current gas flow in hydrogen liquefaction process

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Petroleum Science 2024年第2期21卷 1369-1384页

作者： Chong-Zheng Sun Yu-Xing Li Hui Han Xiao-Yi Geng Xiao Lu College of Energy storage Technology Shandong University of Science and TechnologyQingdao 266590ShandongChina College of Pipeline and Civil Engineering/Shandong provincial key laboratory of oil&gas storage and transportation safety China University of PetroleumQingdao 266580ShandongChina

Liquid hydrogen storage and transportation is an effective method for large-scale transportation and utilization of hydrogen energy. Revealing the flow mechanism of cryogenic working fluid is the key to optimize heat exchanger structure and hydrogen liquefaction process(LH2). The methods of cryogenic visualization experiment, theoretical analysis and numerical simulation are conducted to study the falling film flow characteristics with the effect of co-current gas flow in LH2spiral wound heat *** results show that the flow rate of mixed refrigerant has a great influence on liquid film spreading process, falling film flow pattern and heat transfer performance. The liquid film of LH2mixed refrigerant with column flow pattern can not uniformly and completely cover the tube wall surface. As liquid flow rate increases, the falling film flow pattern evolves into sheet-column flow and sheet flow, and liquid film completely covers the surface of tube wall. With the increase of shear effect of gas-phase mixed refrigerant in the same direction, the liquid film gradually becomes unstable, and the flow pattern eventually evolves into a mist flow.

关键词： Hydrogen liquefaction Spiral wound heat exchanger Flow pattern transition Falling film flow

Microscopic morphology evolution of the crystal structure of tetrahydrofuran hydrate under flowing condition

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Chinese Journal of Chemical Engineering 2022年第5期35卷 103-110页

作者： Jialu Zhang Xiang Liu Shuai Liu Yuxing Li Qihui Hu Wuchang Wang Shandong key laboratory of oil-gas storage and transportation safety College of Pipeline and Civil EngineeringChina University of Petroleum(East China)Qingdao 266580China State key Loboratory of Natural gas Hydrates Beijing 100028China

The evolution of the hydrate particle structure during growth and agglomeration under flowing condition affects the particle as well as flow characteristic,which plays an important role in the flow assurance as well as heat transfer in refrigeration ***,this article conducts experiments to study and observe the growth and agglomeration process in the main forming stage of *** was found that the growth of tetrahydrofuran hydrate was anisotropic and in a layered growth *** crystals generally transformed from octahedral structure to octahedral skeleton structure with growth,however some single crystals also deformed into plate type *** thickness of the plate type particles increased gradually during growth,and the edge part increased earlier than the middle *** agglomeration,the hydrate particles contacted and sintered *** as the impurity didn’t serve as the nucleation center but affected the agglomeration of hydrate particles by *** addition,the effect increased as the sand size ***,a microstructure model for hydrate growth and agglomeration was proposed,which showed the hydrate structure evolution in these processes and could lay a foundation for studying the flow assurance of hydrate slurry.

关键词： Tetrahydrofuran hydrate Growth Agglomeration Morphology Microstructure Microstructure model

Experimental Study on Refinery gas Desulfurization Using gas-Liquid Membrane Contactor

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China Petroleum Processing & Petrochemical Technology 2009年第3期11卷 33-38页

作者： Han Yongjia Wang Shuli Li Hui Xi Chunman Zhou Shidong Jiangsu provincial key laboratory of oil/gas storage and transportation Technology Jiangsu Polytechnic University Changzhou 213016 Sujing Protective Atmosphere Equipment Company

gas-liquid contactors equipped with polytetrafluoroethylene （PTFE） or polypropylene （PP） hydrophobic membranes were applied for removal of sulfur dioxide from refinery gas. Pure water, NaOH solution and MDEA were adopted as the absorbents. The performance of the two kinds of membranes for separation of SO2 was evaluated in terms of the concentration of absorbent solution, the concentration of SO2, and the feed flow rate. The efficiency for removal of SO2 increased with an increasing absorbent concentration. Upon increasing the concentration of SO2 and the feed flow rate, the desulfurization efficiency was decreased.

关键词： refinery gas desulfurization sulfur dioxide MDEA