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Thermo-Hydraulic Characteristics of Non-Isothermal Batch Transportation pipeline system with Different Inlet Oil Temperature

引用

Journal of Thermal Science 2023年第3期32卷 965-981页

作者： CHEN Zhimin YUAN Qing JIANG Weixin LI Zongze YU Bo School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China Faculty of Environment and Life Beijing University of TechnologyBeijing 100124China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

The batch transportation process of several kinds of crude oil is accomplished by an entire coupled pipeline system,which exhibits complex thermo-hydraulic *** on the coupled characteristics among soil,pipelines and devices(including pumps,heating furnaces and valves),a coupled simulation model of batch transportation for the crude oil pipeline system is established,and a novel coupled simulation algorithm is *** simulation results are in good agreement with the field data of an actual crude oil pipeline *** addition,based on the numerical simulation,thermo-hydraulic characteristics of pipeline system are investigated,and some new thermo-hydraulic characteristics are *** the batch transportation process with constant flowrate,the change trends of temperature at the outlet of each pipeline segment are hysteretic and the change ranges of temperature become small along *** the adjustment of devices influences thermohydraulic characteristics to some *** the batch transportation process with variable flowrate,the complex thermo-hydraulic characteristics are exhibited,which are induced by the comprehensive influence of the changes of oil type,flowrate and absorbed/released *** with the transportation process with constant flowrate,the high-viscosity oil exhibits similar minimum temperature and lower maximum pressure in the transportation process with variable flowrate,which means that the higher transportation safety of pipeline system is *** study can provide a scientific reference for making the safer batch transportation scheme of crude oil pipeline system.

关键词： crude oil pipeline system batch transportation coupled simulation variable flowrate thermo-hydraulic characteristics

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THE FLOW CONTROL IN pipeline system

引用

Journal of Hydrodynamics 1996年第4期8卷 49-55页

作者： Xu Zu-xin(National Laboratory of Pollution Control and Resource Reuse, Tangji University Shanghai200092, P. R. China)R. Guercio(Department of Hydraulics, Transportaion and Highway, University of Rome, Rome00184, Italy)

An automatic control technique for the flow regulation in pipeline systems is developed in the paper. The improvement for the previous work is the use of an optimal observer that reduces greatly the time of changing now states and the adaptability for the regulation of frictioness now. By first order Taylor-expanding the frictioness flow equations of motion and continuity at equilibrium states, a set of linear equations are obtained then, the linear quadratic design technique in automatic control theory is used to control the now states. In order to avoid measuring all states, an optimal state estimator is constructed. A pipeline system is taken as example. The regulation results are satisfactory. If the changes of discharges are within 20%, the method developed in this paper is effective for valve-motion synthesis in real pipeline systems.

关键词： automatic control flow regulation, observer linear guadratic theory pipeline system

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Comparison of nonlinear modeling methods for the composite rubber clamp

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 763-778页

作者： Yiming CAO Hui MA Xumin GUO Bingfeng ZHAO Hui LI Xin WANG Bing WANG School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Key Laboratory of Vibration and Control of Aero-Propulsion systems of Ministry of Education of China Northeastern UniversityShenyang 110819China AVIC Shenyang Engine Design Institute Shenyang 110013China Dalian Mengyu Machinery Co. Ltd.Dalian 116317Liaoning ProvinceChina

The cubic stiffness force model(CSFM)and Bouc-Wen model(BWM)are introduced and compared *** unknown coefficients of the nonlinear models are identified by the genetic algorithm combined with *** fitting the identified nonlinear coefficients under different excitation amplitudes,the nonlinear vibration responses of the system are *** results show that the accuracy of the BWM is higher than that of the CSFM,especially in the non-resonant ***,the optimization time of the BWM is longer than that of the CSFM.

关键词： pipeline system nonlinear clamp model composite rubber clamp amplitude-dependent characteristic vibration response experiment

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Analysis of Mechanism of pipeline Damaging by Pastefill in Garson Mine,Canada

引用

International Journal of Mining Science and Technology 2000年第2期21卷 34-37页

作者：杨宝贵孙恒虎黄玉诚段鸿杰 Department of Resource Exploitation Engineering CUMTBeijing100083

The pastefill pipeline system and its problems in Garson Mine were introduced. Based on the conditions of the system, the damage positions in the vertical pipeline were calculated. Mechanism of causing damage to pipeline system by pastefill were analyzed. Because of a non continuous flow of paste, “a jet stream” of the dispersed paste could be formed in the vertical pipeline. Most damages of the pastefill pipeline were caused by two major impacts of jet stream : vacuum steam etching and high velocity abrasion. To avoid the damage, a continuous and a full pipe flow must be ensured in the vertical pipeline.

关键词： pastefill pipeline system jet stream

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