检索结果-南通市图书馆

Particuology 2024年第7期90卷 323-339页

作者： Fopeng Wen Liuyun Xu Yixiang Chen Zhaofu Deng Shen Zhang Wenming Song Yuge Li Liping Wei School of Chemical Engineering Northwest UniversityXi’an710069China School of Chemistry and Chemical Engineering Yan'an UniversityYan'an716000China machinery Industry Shanghai Lanya Petrochemical Equipment Inspection Institute co. Ltd.Shanghai201518China The Research Center of Chemical Engineering Applying Technology for Resource of Shaanxi Xi’an710069China

The elbow erosion seriously jeopardizes the safe and stable operation of water–slag discharge pipeline of the co.l gasification *** work simulated water–slag elbow characteristics with various slag injection positions by simulating five simplified and representative erosion categories,including A-type horizontal-vertical elbow with an upstream flow,B-type horizontal-vertical elbow with a downstream flow,C-type vertical-horizontal elbow with an upstream flow,D-type vertical-horizontal elbow with a downstream flow and E-type horizontal-horizontal *** with the C/D-type elbow,where particles were injected uniformly,the A-type elbow and E-type elbow were found to increase erosion rate,while the B-type elbow decreases erosion *** interesting disco.ery is that the elbow erosion rate is relatively low for small particles when particles are injected from the middle and bottom positions of the inlet section of the *** on the observation,a novel preceding rotating sheet structure was developed to regulate the particle injection *** shows an excellent anti-erosion performance by reducing the maximum erosion rate of particles with diameters of 50,100,and 200μm by 23%,35%,and 43%,respectively.

关键词： Erosion Slag-water Uneven particles Elbow pipe Erosion inhibition Preceding rotating sheet structure

Wellbore-heat-transfer-model-based optimization and co.trol for co.ling downhole drilling fluid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第3期21卷 1955-1968页

作者： Chao Wang He Liu Guo-Wei Yu Chen Yu Xian-Ming Liu Peng Huang Yangtze University Jingzhou434023HubeiChina State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing2249China CNPC Bohai Drilling Engineering co. LtdTianjin300280China Exploration Development and co.struction Engineering Division of PetroChina Jidong oilfield co.pany Tangshan63200HebeiChin Henan University of Urban co.struction Pingdingshan467036HenanChina

To address the two critical issues of evaluating the necessity of implementing co.ling techniques and achieving real-time temperature co.trol of drilling fluids underground in the current drilling fluid co.ling technology,we first established a temperature and pressure co.pled downhole heat transfer model,which can be used in both water-based and oil-based drilling ***,fourteen factors,which co.ld affect wellbore temperature,were *** on the standard deviation of the downhole temperature co.responding to each influencing factor,the influence of each factor was *** influencing factors that can be used to guide the drilling fluid's co.ling technology were drilling fluid thermal co.ductivity,drilling fluid heat capacity,drilling fluid density,drill strings rotation speed,pump rate,visco.ity,ROP,and injection *** nondominated sorting genetic algorithm was used to optimize these six parameters,but the optimization process took 182 *** these eight parameters'influence rules with the nondominated sorting genetic algorithm can reduce the optimization time to 108 ***,the downhole temperature has been demonstrated to increase with the inlet temperature increasing linearly under quasi-steady *** this law and PID,the downhole temperature can be co.trolled,which can reduce the energy for co.ling the surface drilling fluid and can ensure the downhole temperature reaches the set value as soon as possible.

关键词： Drilling co.ling Influencing factors Analysis Optimization co.trol

维普期刊数据库

co.parison of co.bustion Characteristics of Tars Produced with Tobacco.Stem Biomass Gasification

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2024年第1期12卷 119-129页

作者： Bo Chen Mingjun Wang Bo Liu Chunping Lu Guohai Jia Yong Chao Chao Zhong School of Mechanical Engineering Hunan Institute of EngineeringXiangtan411104China School of Automotive Engineering Xiangtan Institute of TechnologyXiangtan411100China School of Electrical and Information Engineering Hunan Institute of EngineeringXiangtan411104China China Metallurgic Jingcheng(Xiangtan)Heavy Industry Equipment co. Ltd.Xiangtan411100China Hunan Shuanghuan Fiber Molding machinery co. Ltd.Xiangtan411100China

In order to study the co.bustion characteristics of tar in biomass gasifier inner wall and gasification gas,“tobacco.stem semi-tar inside furnace”,“tobacco.stem tar inside furnace”and“tobacco.stem tar out-of-furnace”were subjected to thermogravimetric experiments,and the co.bustion characteristics and kinetic characteristics were *** result shows that“tobacco.stem semi-tar inside furnace”has the highest value and“tobacco.stem tar out-of-furnace”is has the lowest value on ignition characteristics,co.bustion characteristics and co.bustible stability;“tobacco.stem semi-tar inside furnace”has the lowest value and“tobacco.stem tar outside furnace”has the highest value on burnout characteristics;“tobacco.stem tar outside furnace”has the highest value and“tobacco.stem tar inside furnace”has the lowest value on integrated co.bustion characteristics.

关键词： Tobacco.stem tar gasifier co.bustion characteristics

The Topology Optimization of Oil Cylinder Mounting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Plant Engineering and Management 2024年第1期29卷 55-62页

作者： LI Zhibin Zhangjiakou Xuanhua Huatai Mining&Metallurgical machinery co. Ltd.Zhangjiakou 075100China

The method of the structural topology optimization is often used to design machine in the early stage of the mechanical *** the mechanical structures use the topology design to produce a new still and lightweight part... 详细信息

关键词： static analysis negative force positive force topology optimization angle range

维普期刊数据库

Exploring pore-scale production characteristics of oil shale after co.(2) huff‘n’puff in fractured shale with varied permeability

在线全文

学校读者我要写书评

暂无评论

International Journal of co.l Science & Technology 2024年第1期11卷 194-203页

作者： Tianhan Xu Jian Wang Yuhao Lu Danling Wang Li Yu Ye Tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Institute for Carbon Neutrality Southwest Petroleum UniversityChengdu610500SichuanChina Research Institute of Shenzhen Branch of CNOOC(China)co. LtdShenzhen518000GuangdongChina PetroChina Huabei oilfield co.pany Cangzhou062552HebeiChina

Recent studies have indicated that the injection of carbon dioxide(co.(2))can lead to increased oil reco.ery in fractured shale reservoirs following natural *** advancements in understanding mass exchange processes in subsurface formations,there remains a knowledge gap co.cerning the disparities in these processes between the matrix and fractures at the pore scale in formations with varying *** study aims to experimentally investigate the co.(2) diffusion behaviors and in situ oil reco.ery through a co.(2) huff‘n’puff process in the Jimsar shale oil *** achieve this,we designed three matrix-fracture models with different permeabilities(0.074 mD,0.170 mD,and 0.466 mD)and experimented at 30 MPa and 91℃.The oil co.centration in both the matrix and fracture was monitored using a low-field nuclear magnetic resonance(LF-NMR)technique to quantify in situ oil reco.ery and elucidate mass-exchange *** results showed that after three cycles of co.(2) huff‘n’puff,the total reco.ery degree increased from 30.28%to 34.95%as the matrix permeability of the co.e samples increased from 0.074 to 0.466 mD,indicating a positive co.relation between co.(2) extraction efficiency and matrix *** similar fracture co.ditions,the increase in matrix permeability further promoted co.(2) extraction efficiency during co.(2) huff‘n’***,the increase in matrix permeability of the co.e had the greatest effect on the extraction of the first-cycle injection in large pores,which increased from 16.42%to 36.64%.The findings from our research provide valuable insights into the co.(2) huff‘n’puff effects in different pore sizes following fracturing under varying permeability co.ditions,shedding light on the mechanisms of co.(2)-enhanced oil reco.ery in fractured shale oil reservoirs.

关键词： Shale reservoir Hydraulic fracturing co.(2)huff‘n’puff NMR Production characteristics

co.parison of nonlinear modeling methods for the co.posite rubber clamp

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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 co.trol 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 co.pared *** unknown co.fficients of the nonlinear models are identified by the genetic algorithm co.bined with *** fitting the identified nonlinear co.fficients 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 co.posite rubber clamp amplitude-dependent characteristic vibration response experiment

维普期刊数据库

Exploration of the mechanism of cavitation vortex rope and vortex development in the draft tube of tubular turbine units

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2024年第1期17卷 163-171,F0002页

作者： Chuang Cheng Zhenggui Li Changrong Shen Shenglong Gu Chuchu Zeng Chuanzheng Bai Meng Liu Junfeng Hu Qinghai University of Science and Technology Xining 810000China Key Laboratory of Fluid and Power machinery Ministry of Education(Xihua University)Chengdu 610039China South-to-North Water Diversion East Jiangsu Water Source co. Ltd.Nanjing 210029China School of civil engineering and water resources Qinghai UniversityXining 810016China Dongyuan Branch of Shenzhen Water Planning and Design Institute co. Ltd.Changsha 410000China

Draft tube vortex rope is co.sidered a special cavitation flow phenomenon in tubular turbine *** vortex rope is one of the most detrimental factors affecting the safety of hydraulic *** this study,ANSYS CFX software was utilized to numerically simulate the internal cavitation flow of a hydraulic turbine draft *** evolution of the cavitation vortex co.e was characterized by vortex line distribution and vorticity transport *** shape and number of blades influenced the revolving direction and distribution characteristics of the vortex close to the runner co.e,which formed a co.nterclockwise-clockwise-co.nterclockwise distribution ***,there were many seco.dary flows in the draft *** cancellation and dissipation between the flows was one of the reasons for reduction in *** the cross-sectional shape of the draft tube was changed,the vorticity was distributed from the center of the vortex rope to all parts of the cross-sectional draft tube,with extreme values at the center and at the *** vortex stretching and dilatation terms played a major role in the change in vorticity,with the baroclinic torque having an effect at the center of the vortex rope,this study is helpful to understand the flow of water in the draft tube and guide the design and optimization of the draft tube in engineering application.

关键词： cavitation vortex rope vorticity transport equation vortex line draft tube

Regulating metal-acid double site balance on mesoporous SiO2-Al2O3 co.posite oxide for supercritical n-decane cracking

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第4期21卷 2881-2891页

作者： Liu-Ling Chen Jun Zhang Chun-Guang Li Li-Qun Fei Bo Wang Chen-Qi Zhang Yi Jiao Jian-Li Wang Institute of New Energy and Low-Carbon Technology Sichuan University Engineering Research Center of co.bustion and co.ling for Aerospace Power Ministry of Education School of Chemical Engineering Sichuan University State Key Laboratory of Industrial Vent Gas Reuse Southwest Institute of Chemical Co. Ltd Science and Technology on Scramjet Laboratory Beijing Power Machinery Research Institute

The balance between metal and acid sites directly affects the preparation of high-performance cracking catalysts with high heat sink and low ***,how to co.trol acid-metal sites balance and its relationship with cracking performance are reported *** this work,a series of Pt/Al2O3-SiO2dual sites catalysts with different metal to acid active sites ratio(CM/CSA) were co.structed by ethanolassisted impregnation method and the impact on n-decane cracking under supercritical co.ditions was systematically and deeply *** results showed that the co.version and carbon deposition increased gradually with varied CM/CSAand reached the balance at CM/CSAof *** proper ratio CM/CSA（0.13） can balance the deep dehydrogenation co.ing over metal active sites and high heat sink of cracking over acid active sites,the chemical heat sink reaches amazing 1.75 MJ/kg and carbon deposition is only22.03 mg/cm2at 750℃.Meanwhile,the few metal sites at low CM/CSAand the few strong acid sites at high CM/CSAare the main factors limiting the cracking *** CM/CSAlimit the activation of C-H bond and deep dehydrogenation of co.ing precursor,resulting in relative low cracking activity and carbon deposition,while high CM/CSAlimit the activation of C-C bond and increase the deep *** this co.tribution,design and co.struction of metal-acid dual sites can not only provide the technical solution for the preparation of high heat sink and low co.ing cracking catalyst,but also deepen the understanding of the cracking path of hydrocarbon fuel.

关键词： Metal-acid dual sites balance Catalytic cracking Hydrocarbon fuels Chemical heat sink Carbon deposition

Paleoenvironment evolution and organic matter enrichment mechanisms in the first member of the Qingshankou Formation,Songliao Basin,China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2024年第2期18卷 364-383页

作者： Ying LI Min WANG Yu YAN Xin WANG Jinyou ZHANG Xuefeng BAI Yuchen ZHANG Jiaheng XUE Junsheng FEI Lianbin ZHANG Guojun WANG School of Geoscience China University of Petroleum(East China)Qingdao 266580China Shandong Provincial Key Laboratory of Deep Oil and Gas Qingdao 266580China Exploration and Development Research Institute of Daqing oilfield co.Ltd. Daqing 163712China Exploration Division PetroChina Daqing Oilfield CompanyDaqing 163453China Department of Physics Xiamen University MalaysiaBandar Sunsuria 43900Malaysia

Organic matter is the basis for oil and gas generation,and the depositional environment co.trols its *** first member of the Qingshankou Formation(K_(2)qn^(1))in Songliao Basin has a thick organic-rich shale and so is an important target section for shale oil exploration and *** the Gulong Sag,shale samples from this unit were co.lected over the full length of the *** characterization of the environments of deposition(EOD)of K_(2)qn^(1)was improved by utilizing lithological characteristics,thin section observations,elemental co.positions,and organic carbon *** with the normalization co.fficients proposed in this paper,an organic matter co.relation model was established to elucidate the factors that influence organic matter *** the bottom to the top of K2qn1,the lake depth gradually beco.es shallower,the primary productivity first decreases and then increases,the reducing co.ditions beco.e stronger and then weaker,the water salinity gradually decreases,the climate first beco.es semi-humid and then warm and humid,and the input of terrigenous debris first decreases and then increases.A major marine transgression at the base of the K_(2)qn^(1)᾽s brought in nutrients to increase primary productivity,and the density-stratified reducing environment preserved and enriched organic *** primary productivity occurred during the middle of the deposition of the K_(2)qn^(1),while terrigenous input is *** matter is preserved in reduced deep lake environments,resulting in organic matter-rich black *** lake became shallower,and the salinity decreased in the upper part of K_(2)qn^(1).Benthic organisms rapidly multiplied,co.suming large amounts of oxygen and destroying the previously depositional environment,resulting in a reducing environment disturbed by benthic organisms with poor preservation co.ditions and the lowest organic matter co.tent.

关键词： major and trace elements paleoenvironment evolution OM enrichment mechanism lacustrine shale Songliao Basin Qingshankou Formation

A Novel Method for Aging Prediction of Railway Catenary Based on Improved Kalman Filter

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2024年第1期18卷 73-90页

作者： Jie Li Rongwen Wang Yongtao Hu Jinjun Li School of Electrical Engineering and Automation Henan Institute of TechnologyXinxiang453003China Technology Center Sichuan Injet Electric Co.Ltd.Deyang618000China Embedded System Research Institute Xinxiang Engineering Research Center for Intelligent Condition Monitoring of MachineryXinxiang453003China

The aging prediction of railway catenary is of profound significance for ensuring the regular operation of electrified ***,in real-world scenarios,accurate predictions are challenging due to various *** paper addresses this challenge by proposing a novel method for predicting the aging of railway catenary based on an improved Kalman filter(KF).The proposed method focuses on modifying the priori state estimate co.ariance and measurement error co.ariance of the KF to enhance accuracy in co.plex *** co.paring the optimal displacement value with the theoretically calculated value based on the thermal expansion effect of metals,it beco.es possible to ascertain the aging status of the *** improve prediction accuracy,a railway catenary aging prediction model is co.structed by integrating the Takagi-Sugeno(T-S)fuzzy neural network(FNN)and *** this model,an adaptive training method is introduced,allowing the FNN to use fewer fuzzy *** inputs of the model include time,temperature,and historical displacement,while the output is the predicted ***,the KF is enhanced by modifying its prior state estimate co.ariance and measurement error *** modifications co.tribute to more accurate ***,a low-power experimental platform based on FPGA is implemented to verify the effectiveness of the proposed *** test results demonstrate that the proposed method outperforms the co.pared method,showcasing its superior performance.

关键词： Railway catenary Takagi-Sugeno fuzzy neural network Kalman filter aging prediction