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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

Classified recognition for metal magnetic memory signals of welding defects in API 5L X65 pipeline steel

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China Welding 2012年第3期21卷 27-32页

作者：张建军邸新杰金宝郭晓疆李午申 Tianjin Key laboratory of Advanced Joining Technology Tianjin UniversityTianjin300072 national engineering laboratory of transportation safety of oil&gas pipeline Langfang065000

Feature extraction and selection from signals is a key issue for metal magnetic memory testing technique. In order to realize the classification of metal magnetic memory signals of welding defects, four fractal analysis methods, such as box- counting, detrended fluctuation, minimal cover and rescaled-range analysis, were used to extract the feature signal after the original metal magnet memory signal was de-noising and differential processing, then the Karhunen-Lo^e transformation was adopted as classification tool to identify the defect signals. The result shows that this study can provide an efficient classification method for metal magnetic memory signal of welding defects.

关键词： welding defect metal magnetic memory fractal analysis classified recognition

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

Research methods and devices for hydrate characteristics during oil and gas transportation:A review

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Chinese Journal of Chemical engineering 2024年第9期73卷 130-145页

作者： Jie Zhang Lei Shi Chuanxian Li Fei Yang Bo Yao Guangyu Sun College of pipeline&Civil engineering China University of Petroleum(East China)Qingdao 266580China Shandong Key laboratory of oil&gas Storage and transportation safety Qingdao 266580China

Due to the high-pressure and low-temperature exploitation environment,the characteristics of hydrates are directly related to the safety of pipeline transportation,which is an important research topic for deep-sea flow *** this review,six kinds of extensively used experimental equipment and three types of hot computer simulation methods,which are employed to explore the hydrate characteristics under deep-sea conditions,are comprehensively summarized,covering micro to macro research *** experimental equipment includes rotational rheometer,flow loop,high-pressure reactor,differential scanning calorimeter(DSC),micromechanical force(MMF)testing apparatus and microscopic morphology observation(MMO)*** computer simulation methods involve numerical simulation,molecular dynamics(MD)simulation,Monte Carlo(MC)simulation and first-principles *** advantages and disadvantages are compared in detail,and their basic principles,main applications and the latest research progress are *** suggestions for future research methods are also *** work aims to help readers quickly grasp the characteristics of the most used research methods,choose suitable methods for their study and further expand these methods,so as to advance the development in hydrate research area.

关键词： Hydrate characteristics Experimental equipment Computer simulation Flow assurance Review

Challenges in Li-ion battery high-voltage technology and recent advances in high-voltage electrolytes

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Journal of Energy Chemistry 2024年第4期91卷 73-98页

作者： Jianguo Liu Baohui Li Jinghang Cao Xiao Xing Gan Cui Shandong Key laboratory of oil&gas Storage and transportation safety College of Pipeline and Civil EngineeringChina University of Petroleum(East China)Qingdao 266580ShandongChina

The electrolyte directly contacts the essential parts of a lithium-ion battery,and as a result,the electrochemical properties of the electrolyte have a significant impact on the voltage platform,charge discharge capacity,energy density,service life,and rate discharge *** raising the voltage at the charge/discharge plateau,the energy density of the battery is ***,this causes transition metal dissolution,irreversible phase changes of the cathode active material,and parasitic electrolyte oxidation *** article presents an overview of these concerns to provide a clear explanation of the issues involved in the development of electrolytes for high-voltage lithium-ion ***,solidstate electrolytes enable various applications and will likely have an impact on the development of batteries with high energy *** is necessary to improve the high-voltage performance of electrolytes by creating solvents with high thermal stabilities and high voltage resistance and additives with superior film forming performance,multifunctional capabilities,and stable lithium *** offer suggestions for the future development of high-energy lithium-ion batteries,we conclude by offering our own opinions and insights on the current development of lithium-ion batteries.

关键词： Lithium-ion battery High voltage Electrolyte additive Solid electrolyte

Experimental Study on Thermal Performance of FLNG Spiral Wound Heat Exchanger under Sloshing Conditions

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Journal of Thermal Science 2019年第5期28卷 1042-1053页

作者： YAN Yan SUN Chongzheng HAN Hui LI Yuxing 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 Petroleum

The FLNG spiral wound heat exchanger(SWHE) is affected by the sea conditions, which leads to more complex flow process and decrease the heat transfer performance of the heat exchanger. In order to study the thermal performance of FLNG SWHE under heaving and swaying conditions, the experimental devices of FLNG SWHE and six-DOF(degree of freedom) sloshing platform were built. The effects of heaving and swaying motions on the pressure drop and heat transfer characteristics were analyzed at different sloshing amplitudes. The results showed that the heaving and swaying motions can cause the temperature rise and pressure fluctuation of SWHE, especially for swaying. The effect of sloshing on the heat transfer performance at the top of SWHE was greater than bottom. The pressure fluctuation percentage was within 7% and the amount of temperature change was less than 2℃, under the sloshing displacement among 120–255 mm.

关键词： spiral wound heat exchanger FLNG experimental sloshing

Modeling the viscoelasto-plastic behavior of waxy crude

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Petroleum Science 2013年第3期10卷 395-401页

作者： Teng Houxing Zhang Jinjun national engineering laboratory for pipeline safety/Beijing Key laboratory of oil and gas Distribution Technology China University of Petroleum

Waxy crude oil exhibits complex rheological behavior below the pour point temperature, such as viscoelasticity, yield stress, and thixotropy, owing to the formation of a three-dimensional spongelike interlock network structure. This viscoelasto-thixotropic behavior is an important rheologieal behavior of waxy crude oils, determining the flow recovery and safe restart of crude oil pipelines. Up to now, the thixotropic models for waxy crude have been all viscoplastic models, without considering the viscoelastic part before the yield point. In this work, based on analyzing the variation of the elastic stress and viscous stress in the Mujumbar model, a new viscoelasto-plastic model is proposed, whose shear stress is separated into an elastic component and a viscous component. The elastic stress is the product of the shear modulus and elastic strain; the shear modulus is proportional to the structural parameter. For the elastic strain, we followed the line of Zhu and his coauthors and assumed that it may be expressed by an algebraic equation. The model is validated by stepwise shear rate tests and hysteresis loop tests on Daqing and Zhongyuan waxy crude. The results show that the model＇s fitting and predictive capability is satisfactory.

关键词： Thixotropy viscoelasticity viscoelasto-plastic model thixotropic model waxy crude

Advances in rheology and flow assurance studies of waxy crude

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Petroleum Science 2013年第4期10卷 538-547页

作者： Zhang Jinjun Yu Bo Li Hongying Huang Qiyu national engineering laboratory for pipeline safety/Beijing Key laboratory of Urban oil and gas Distribution Technology China University of Petroleum

Flow assurance is one of the core issues in safe and economical operation of waxy crude *** essence lies in flow and heat transfer of the *** the past 10 years,the authors＇ team has achieved a lot of innovative results in aspects of waxy crude rheology,flow assurance assessment,and pipelining technologies on the basis of decades of *** rheological characteristics of waxy crude are much better understood,and a method for quantitatively simulating the effect of flow shear was developed based on some theoretical *** of the mechanism of waxy crude rheology have been deepened to the quantitative *** successful development of efficient numericalalgorithms,accurate simulations have been achieved for various complex flow and heat transfer situations in waxy crude pipelining,and a reliability-based approach to flow assurance assessment has been set *** pipelining technologies have been developed such as batching pour-point depressant-（PPD-） treated multiple-waxy-crudes,intermittent transport of waxy crudes through long-distance pipelines,and batching hot and cold *** their application,a series of problems hindering safe,efficient and flexible operation of waxy crude pipelines were tackled,demonstrating that transportation technologies for waxy crude have advanced to a new and high level.

关键词： Waxy crude pipeline transportation flow assurance rheology numerical simulation

A metaheuristic method for the multireturn-to-depot petrol truck routing problem with time windows

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Petroleum Science 2019年第3期16卷 701-712页

作者： Bohong Wang Yongtu Liang Meng Yuan Haoran Zhang Qi Liao national engineering laboratory for pipeline safety/Beijing Key laboratory of Urban oil and gas Distribution Technology China University of Petroleum

The petrol truck routing problem is an important part of the petrol supply *** study focuses on determining routes for distributing petrol products from a depot to petrol stations with the objective of minimizing the total travel cost and the fixed cost required to use the *** propose a mathematical model that considers petrol trucks returning to a depot multiple times and develop a heuristic algorithm based on a local branch-and-bound search with a tabu list and the Metropolis acceptance *** addition,an approach that accelerates the solution process by adding several valid inequalities is *** this study,the trucks are homogeneous and have two compartments,and each truck can execute at most three tasks *** sales company arranges the transfer amount and the time windows for each *** performance of the proposed algorithm is evaluated by comparing its results with the optimal *** addition,a real-world case of routing petrol trucks in Beijing is studied to demonstrate the effectiveness of the proposed approach.

关键词： Petrol truck routing problem Heuristic algorithm Valid inequalities Time windows

Standard friction prediction model of long-distance hot oil pipelines

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Petroleum Science 2020年第2期17卷 487-498页

作者： Tao Yu Chuan-xian Li Bo Yao Zhi-jun Zhang Yi Guo Li-jun Liu College of pipeline and Civil engineering Shandong Provincial Key Laboratory of Oil&Gas Storage and Transportation SafetyChina University of Petroleum(East China)Qingdao 266580ShandongChina Petrochina oil and gas pipeline Control Center Beijing 100007China Richfit Information Technology Co.Ltd Beijing 100007China

We developed a predictive model for the pipeline friction in the 520-730 m^3/h transmission range using the multi-layerperceptron-back-propagation(MLP-BP)method and analyzing the unit friction data after the pigging of a hot oil *** view of the shortcomings of the MLP-BP model,two optimization methods,the genetic algorithm(GA)and mind evolutionary algorithm(MEA),were used to optimize the MLP-BP *** research results were applied to the standard friction prediction of three sections of a hot oil *** the GA and MEA optimizations,the average errors of the three sections were 0.0041 MPa for the GA and 0.0012 MPa for the MEA,and the mean-square errors were 0.083 and 0.067,*** MEA-BP model prediction results were characterized by high precision and small *** MEABP prediction model was applied to the analysis of the wax formation 60 and 90 days after *** analysis results showed that the model can effectively guide pipe pigging and *** was little sample data for the individual transmission and oil temperature steps because the model was based on actual production data modeling and analysis,which may have affected the accuracy and adaptability of the model.

关键词： Hot oil pipeline Friction MLP-BP GA MEA