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Influence of separator control on the characteristics of severe slugging flow

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Petroleum Science 2014年第2期11卷 300-307页

作者： Luo Xiaoming he limin Liu Xinye Lü Yuling College of Pipeline and Civil Engineering China University of Petroleum

Due to the special structure of offshore multiphase pipes, it is easy for severe slugging to occur in the riser at low gas-liquid velocity. Violent pressure fluctuations and dramatic changes of flow rate are the main characteristics of severe slugging, leading to the risk of serious damage. In this paper, the separator control is adopted to accurately control the separator liquid level and pressure under severe slugging flow conditions. This indicates that the separator liquid level control alone does not have a significant impact on the upstream flow, but it is beneficial for normal operation and pressure control of the separator. As the separator pressure increases, the peak pressure in the riser apparently diminishes, and the amplitude of pressure fluctuation gradually decreases, which means that severe slugging is inhibited. During the slug blowing out, the gas/liquid slipping in the riser intensifies. The long gas plug quickly flows through the riser, and then tends to morph into short and slowly flowing gas bubbles. The elimination effect of the pressure control strategy on severe slugging is related to the relative rate of the superficial gas/liquid flow.

关键词： Multiphase flow severe slugging separator control riser

Influence of slug flow on flow fields in a gas–liquid cylindrical cyclone separator:A simulation study

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Chinese Journal of Chemical Engineering 2020年第8期28卷 2075-2083页

作者： Xiaoming Luo Jing Ren Tong Chen YibinWang Yuling Lü limin he Shandong Key Laboratory of Oil&Gas Storage and Transportation Safety China University of Petroleum(East China)Qingdao 266580China Sinopec Luoyang Engineering Co. Ltd.Luoyang 471003China

A simulation method for slug flow based on the VOF multiphase flow model was implemented in ANSYS?Fluent via a user-defined function(UDF)and applied to the dissipation of liquid slugs in the inlet pipe of a gas–liquid cylindrical cyclone(GLCC)separator while varying the expanding diameter ratio and angle of *** dissipation of liquid slug in inlet pipe is analyzed under different expanding diameter ratios and inclination *** the inlet pipe,it is found that increasing expanding diameter ratio and inclination angle can reduce the liquid slug stability and enhancing the effect of gravity,which is beneficial to slug flow *** the cylinder,increasing the expanding diameter ratio can significantly reduce the liquid carrying depth of the gas phase but result in a slightly increase of the gas content in the liquid phase ***,increasing the inclination angle results in a decrease in the carrying depth of liquid in the vapor phase,but enhances gas–liquid mixing and increases the gas-carrying depth in the liquid *** into consideration the dual effects of slug dissipation in the inlet pipe and carrying capacity of gas/liquid spaces in the cylinder,the optimal expanding diameter ratio and inclination angle values can be determined.

关键词： GLCC Slug simulation Flow pattern Liquid slug dissipation Cyclonic flow field analysis

Experimental study on sand particles accumulation,migration and separation efficiency in slug catcher

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Chinese Journal of Chemical Engineering 2021年第4期34卷 134-143页

作者： Xianchao Liang limin he Xiaoming Luo Qingping Li Yuanpeng You Yiqiu Xu College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao 266580China Offshore Oil Engineering Co.Ltd Tianjin 300461China

Sand production often leads to the failure of production equipment on offshore ***,a new idea has been put forward,which is installing cyclone or baffle in the internal of the slug catcher for better sand *** this paper,an experimental study is presented,which mainly includes sand particles accumulation shape,migration law and separation *** results suggest that the accumulation area is mainly divided into two zones:the crowded settlement zone and the free settlement *** crowded settlement zone has a special shape,which can be characterized by two parameters:accumulation length and accumulation *** sampling analysis shows obvious particle *** particle size decreases with the increase of the axial distance,and the range of particle size distribution narrows *** separation experiment shows that the gas velocity has the greatest influence on the separation *** the gas velocity is 14 m·s^ 1,the separation efficiency drops sharply,which can be abated by installing cyclone *** addition,the separation efficiency tends to be a constant under different gas velocities by installing baffle with appropriate *** the effectiveness and rationality of installing internal components can be strongly *** these provide important guidance for maximizing the sand control function of the slug catcher.

关键词： Slug catcher Particle size distribution Separation efficiency Sedimentation Cyclone separator Baffle

Numerical Simulation and Experimental Analysis of the Influence of Asymmetric Pressure Conditions on the Splitting of a Gas-Liquid Two-Phase Flow at a T-Junction

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Fluid Dynamics & Materials Processing 2021年第5期17卷 959-970页

作者： Lihui Ma limin he Xiaoming Luo Xiangran Mi College of Pipeline and Civil Engineering China University of PetroleumQingdao266580China Shandong Provincial Key Laboratory of Oil&Gas Storage and Transportation Safety China University of PetroleumQingdao266580China China National Oil and Gas Exploration and Development Corporation Beijing100034China

Dedicated experiments and numerical simulations have been conducted to investigate the splitting characteristics of a gas-liquid two phase flow at a T *** experiments were carried out for different gas-liquid *** flow rates in the two branches were measured accurately to determine how the two considered phases distribute in the two *** experimental results have shown that when the two outlet pressures are asymmetric,the two-phase flow always tends to flow into the outlet which has a lower *** the inlet liquid velocity increases,however,the two-phase flow gradually tends to split *** with the experiment results,the pressure difference between the two outlets can be determined more accurately by means of numerical *** trends of experimental results and simulations are in very good agreement.

关键词： Two-phase flow pressure flow loop gas-liquid split characteristics simulation

A highly active and stable Pd/B-doped carbon catalyst for the hydrogenation of 4-carboxybenzaldehyde

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Journal of Energy Chemistry 2019年第4期28卷 154-158页

作者： Kai Tie Xiulian Pan Tie Yu Pan Li limin he Xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Chemical Physics University of Science and Technology of China

Boron had been introduced into the structure of carbon material(BC), which was used as the support of Pd catalyst for hydrogenation of 4-carboxybenzaldehyde(4-CBA). The physical properties and chemical composition of the support and corresponding catalyst were characterized by N2 adsorption–desorption,Raman spectroscopy, inductively coupled plasma optical emission spectroscopy(ICP-OES), element analysis(EA), high-resolution transmission electron microscopy(HRTEM), CO-pulse chemisorption and X-ray photoelectron spectroscopy(XPS). The results demonstrate that Pd/BC catalyst exhibits a superior activity and good stability due to the more uniform dispersion of Pd nanoparticles, the presence of mesoporous structure and the enhanced interaction between Pd nanoparticles and the support, compared to carbon and N-doped carbon supported Pd catalysts(Pd/C and Pd/NC, respectively).

关键词： heteroatom-doped carbon Palladium Catalytic hydrogenation

The activity and stability of PdCl_2/C-N catalyst for acetylene hydrochlorination

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Science China Chemistry 2018年第4期61卷 444-448页

作者： Pan Li Minzheng Ding limin he Kai Tie Hao Ma Xiulian Pan Xinhe Bao Department of Chemical Physics University of Science and Technology of China Dalian Institute of Chemical Physics Chinese Academy of Sciences School of Mechanical Engineering Shanghai Jiao Tong University

Carbon supported PdCl_2 is highly active in catalyzing acetylene hydrochlorination reaction, but deactivates rather quickly. Upon nitrogen doping in the carbon structure, the stability of the PdCl_2 catalysts is significantly improved. Furthermore, the results show that 900 ℃ is a preferred doping temperature. The acetylene conversion keeps above 90% even after 1200 min time on stream whereas the one without nitrogen doping drops to below 10% after 450 min. The stabilizing mechanism of nitrogen doping on catalyst was studied.

关键词： acetylene hydrochlorination nitrogen doping palladium chloride mercury-free catalyst stability

Controllable preparation and microwave absorption properties of shape anisotropic Fe_(3)O_(4) nanobelts

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Journal of Materiomics 2021年第5期7卷 957-966页

作者： Jialiang Pan Rujing Zhang Jun Ling Min Wang Zechen Li Zhen Zhen limin he Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China The First Scientific Research Institute of Wuxi Wuxi214035JiangsuChina Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China

To substantially prevent electromagnetic threatens,microwave absorbing materials(MAMs)are required to eliminate surplus electromagnetic *** a typical MAM,Fe_(3)O_(4) particles with complex permittivity and permeability have been widely applied due to the coexistence of magnetic loss and dielectric ***,the necessary high mass fraction significantly limited its applications,thus Fe_(3)O_(4) nanostructures have been extensively investigated to overcome this *** this work,uniform Fe_(3)O_(4) nanobelts were prepared by electrospinning and two-step thermal *** controlling the composition and viscosity of the electrospinning precursor solution,Fe_(3)O_(4) nanobelts with tunable lateral sizes(200 nme1 mm)were *** samples with low content(only 16.7 wt%)Fe_(3)O_(4) exhibited wide maximum effective absorbing bandwidths(EAB)over 3 GHz,and Fe_(3)O_(4) nanobelts with smaller lateral sizes showed a maximum EAB of 4.93 ***,Fe_(3)O_(4) nanobelts with smaller lateral sizes presented superior reflection loss properties,the lowest reflection loss reached-53.93 dB at 10.10 GHz,while the maximum EAB was up to 2.98 *** excellent microwave reflection loss of Fe_(3)O_(4) nanobelts was contributed to the enhanced synergistic effect of magnetic loss,dielectric loss,and impedance matching,originated from the hierarchically cross-linked networks and shape *** study could broaden the practical applications of magnetic absorbers,and provided an approach for the development of shape anisotropic magnetic materials.

关键词： Fe_(3)O_(4) Nanobelts Shape anisotropy Microwave absorption Reflection loss

Study on Glulam Process

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Chinese Forestry Science and Technology 2006年第1期5卷 40-44页

作者： PENG limin WANG Haiqing he Weili Research Institute of Wood Industry Chinese Academy of Forestry Beijing 100091 P.R. China

This paper selected lumbers of Manchurian ash (Fraxinus rnandshurica), Manchurian walnut(Juglans mandshurica) and Spruce (Picea jezoensis ***) for manufacturing glulam with water-borne polymeric-isocyanate adhesive to determine process variables. The process variables that includespecific pressure, pressing time and adhesive application amount influencing the shear strength of the glulam,were investigated through the orthogonal test. The results indicated that optimum process variables forglulam manufacturing were as follows: Specific pressure of 1.5 MPa for Spruce and 2.0 MPa both forManchurian ash and Manchurian walnut, pressing time of 60 min and adhesive application amount of 250 g/m2.

关键词： glulam shear strength orthogonal test process variable

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胺碘酮预防心脏手术再灌注心室颤动的疗效

中华胸心血管外科杂志 2021年第3期37卷 168-172页

作者：熊斌何立敏重庆医科大学附属第二医院重症医学科 400010 重庆医科大学附属第一医院第一分院心内科 400015

目的探讨胺碘酮预防心脏手术再灌注心室颤动(RVF)的疗效。方法计算机检索知网、万方、维普、Cochrane、Embase、Web of Knowledge和PubMed等数据库,搜索胺碘酮预防心脏手术患者RVF的相关研究,时间截至2019年12月。按照既定标准使用Revma... 详细信息

目的探讨胺碘酮预防心脏手术再灌注心室颤动(RVF)的疗效。方法计算机检索知网、万方、维普、Cochrane、Embase、Web of Knowledge和PubMed等数据库,搜索胺碘酮预防心脏手术患者RVF的相关研究,时间截至2019年12月。按照既定标准使用Revman 5.3软件进行meta分析。结果共纳入6项研究,包括514例患者。按照干预方式不同分为胺碘酮组196例、利多卡因组153例和对照组165例。RVF发生率比较,胺碘酮组显著低于对照组,差异有统计学意义(RR:0.64,95%CI:0.47~0.86,P=0.003,I^(2)=49%);但胺碘酮组和利多卡因组间差异无统计学意义(RR:1.03,95%CI:0.48~2.22,P=0.94,I^(2)=74%)。RVF除颤次数比较,胺碘酮组比对照组少,但差异无统计学意义(RR:0.90,95%CI:0.68~1.20,P=0.48,I^(2)=0);利多卡因组和胺碘酮组间差异亦无统计学意义(RR:1.50,95%CI:0.90~2.52,P=0.12,I^(2)=38%)。结论胺碘酮有助于减少心脏手术患者的RVF发生率。

关键词：胺碘酮再灌注心室颤动心脏外科手术 Meta分析