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Emission of intermediate volatility organic compounds from a ship main engine burning heavy fuel oil

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Journal of Environmental Sciences 2019年第10期31卷 197-204页

作者： Haijun Lou Yuejiao Hao Weiwei Zhang Penghao Su Fan Zhang Yingjun Chen Daolun Feng Yifan Li College of Merchant Marine Shanghai Maritime University Shanghai 201306 China Department of Environmental Engineering Shanghai Maritime University Shanghai 201306 China College of Environmental Science and Engineering Tongji University Shanghai 200092 China International Joint Research Center for Persistent Toxic Substances(IJRC-PTS) Shanghai Maritime University Shanghai 200135 China International Joint Research Center for Persistent Toxic Substances(IJRC-PTS-NA) Toronto Ontario M2N 6X9 Canada

Intermediate volatility organic compounds(IVOCs)are crucial precursors of secondary organic aerosol(SOA).In this study,gaseous IVOCs emitted from a ship main engine burning heavy fuel oil(HFO)were investigated on a test bench,which could simulate the real-world operations and emissions of ocean-going ships.The chemical compositions,emission factors(EFs)and volatility distributions of IVOC emissions were investigated.The results showed that the main engine burning HFO emitted a large amount of IVOCs,with average IVOC EFs of 20.2-201 mg/kg-fuel.The IVOCs were mainly comprised of unspeciated compounds.The chemical compositions of exhaust IVOCs were different from that of HFO fuel,especially for polycyclic aromatic compounds and alkylcyclohexanes.The volatility distributions of IVOCs were also different between HFO exhausts and HFO fuel.The distinctions in IVOC emission characteristics between HFO exhausts and HFO fuel should be considered when assessing the IVOC emission and related SOA formation potentials from ocean-going ships burning HFO,especially when using fuel-surrogate models.

关键词： Marine main engine Intermediate-volatility organic compounds Heavy fuel oil Emission factor Chemical composition Distribution

Enrichment of hydrogen in product gas from a pilot-scale rice husk updraft gasification system

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Carbon Resources Conversion 2022年第3期5卷 231-239页

作者： Phan Dinh Tuan Le Minh Quan Vo Trang Nhi Hoang Minh Huong Le Thi Kim Phung Daolun Feng Hochiminh City University of Natural Resources and Environment 236B Le Van Sy St.Tan Binh Dist.Ho Chi Minh City 70.000Viet Nam Applied Research Institute for Natural Resources Materialand Environment58/4 Tran Van Du St.Tan Binh Dist.Ho Chi Minh City 70.000Viet Nam Hochiminh City University of Technology 268 Ly Thuong Kiet St.Dist.10Ho Chi Minh City 70.000Viet Nam Vietnam National University-Ho Chi Minh(VNU-HCM) Linh Trung WardThu Duc CityHo Chi Minh CityViet Nam College of Marine Science and Engineering Shanghai Maritime UniversityShanghai 200135PR China

An updraft gasifier was employed to treat 3 kg of dried rice husk per batch with different types of gasifying agents such as air,steam/air,and air with dolomite catalyst addition at various operating conditions.The H2 content,low heating value,and H2/CO ratio in syngas were compared to determine the most effective solution to enhance the H2 production from rice husk gasification.The presence of dolomite in air gasification produced the highest H2 content in the product gas,up to 15.4 mol%,followed by 7.08 and 3.6 mol%when steam/air and air standalone were used as gasifying agents,respectively.The higher low heating value of syngas 5.1 MJ/Nm3 was observed in catalytic air gasification compared to 3.6 MJ/Nm3 when steam was added.The optimal operation condition was reported at an airflow rate of 3 m3/h and a catalyst mixing ratio of 15%.

关键词： Rice husk Enriched hydrogen syngas Dolomite Updraft gasifier

Microstructure and low cycle fatigue of a Ti2AlNb-based lightweight alloy

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Journal of Materials Science & Technology 2020年第9期44卷 140-147页

作者： Yinling Zhang Aihan feng Shoujiang Qu Jun Shen daolun Chen School of Materials Science and Engineering Tongji UniversityShanghai 201804China Department of Mechanical and Industrial Engineering Ryerson UniversityTorontoOntario M5B 2K3Canada Shanghai Key Laboratory of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China

Ti2AlNb-based intermetallic compounds are considered as a new category of promising lightweight aerospace materials due to their balanced mechanical properties.The aim of this study was to evaluate monotonic and cyclic deformation behavior of an as-cast Ti-22A1-20Nb-2V-1Mo-0.25Si(at.%)intermetallic compound in relation to its microstructure.The alloy containing an abundant fine lamellar O-Ti2AlNb phase exhibited a good combination of strength and plasticity,and superb fatigue resistance in comparison with other intermetallic compounds.Cyclic stabilization largely remained except slight cyclic hardening occurring at higher strain amplitudes.While fatigue life could be described using the common Coffin-Mason-Basquin equation,it could be better predicted via a weighted energy-based approach.Fatigue crack growth was characterized mainly by crystallographic cracking,along with fatigue striationlike features being unique to appear in the intermetallics.The results obtained in this study lay the foundation for the safe and durable applications of Ti2AlNb-based lightweight intermetallic compounds.

关键词： Ti2AlNb-based alloy Cyclic deformation Low cycle fatigue Fatigue life prediction Fracture

Emissions of intermediate volatility organic compound from waste cooking oil biodiesel and marine gas oil on a ship auxiliary engine

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Journal of Environmental Sciences 2020年第5期32卷 262-270页

作者： Penghao Su Yuejiao Hao Zhe Qian Weiwei Zhang Jing Chen Fan Zhang Fang Yin Daolun Feng Yingjun Chen Yifan Li Department of Environmental Engineering Shanghai Maritime UniversityShanghai 201306China College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Key Lab of Geographic Information Science of Ministry of Education of China School of Geographic SciencesEast China Normal UniversityShanghai 200142China International Joint Research Center for Persistent Toxic Substances(IJRC-PTS) Shanghai Maritime UniversityShanghai 200135China School of Environmental Engineering Fudan UniversityShanghai 200433China International Joint Research Center for Persistent Toxic Substances(IJRC-PTS) State Key Laboratory of Urban Water Resource and EnvironmentSchool of Municipal and Environmental EngineeringHarbin Institute of TechnologyHarbin 150090China

Ship auxiliary engines contribute large amounts of air pollutants when at berth.Biodiesel,including that from waste cooking oil(WCO),can favor a reduction in the emission of primary pollutant when used with internal combustion engines.This study investigated the emissions of gaseous intermediate-volatile organic compounds(IVOCs)between WCO biodiesel and marine gas oil(MGO)to further understand the differences in secondary organic aerosol(SOA)production of exhausts.Results revealed that WCO exhaust exhibited similar IVOC composition and volatility distribution to MGO exhaust,despite the differences between fuel contents.While WCO biodiesel could reduce IVOC emissions by 50%as compared to MGO,and thus reduced the SOA production from IVOCs.The compositions and volatility distributions of exhaust IVOCs varied to those of their fuels,implying that fuel-component-based SOA predicting model should be used with more cautions when assessing SOA production of WCO and MGO exhausts.WCO biodiesel is a cleaner fuel comparing to conventional MGO on ship auxiliary engines with regard to the reductions in gaseous IVOC emissions and corresponding SOA productions.Although the tests were conducted on test bench,the results could be considered as representative due to the widely applications of the test engine and MGO fuel on real-world ships.

关键词： Waste cooking oil biodiesel Marine gas oil Marine auxiliary engine Intermediate-volatility organic compounds Secondary organic aerosol

Multiple α sub-variants and anisotropic mechanical properties of an additively-manufactured Ti-6Al-4V alloy

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Journal of Materials Science & Technology 2021年第11期70卷 113-124页

作者： Yinling Zhang Zhuo Chen Shoujiang Qu Aihan feng Guangbao Mi Jun Shen Xu Huang daolun Chen School of Materials Science and Engineering Tongji UniversityShanghai 201804China Department of Mechanical and Industrial Engineering Ryerson UniversityTorontoOntario M5B 2K3Canada Aerospace Hiwing(Harbin)Titanium Industrial Co. Ltd.Harbin High Tech ZoneHarbin 150028China Shanghai Key Lab.of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China

Additive manu facturing(AM)is a promising material processing method which gains significant momentum in the aerospace and biomedical industries.However,the anisotropy in the mechanical properties of additively-manufactured materials is still poorly understood.This study was aimed at elucidating crystallographic feature-anisotropy-mechanical property relationship for a Ti-6Al-4V alloy manufactured via selective electron beam melting(SEBM).Abundantαlamellae with six variants were present inside the columnar prior-βgrains with afiber texture duringβ→αphase transformation.The sixαvariants followed the Burgers orientation relationship of{110}_(β)//{0001}_(α)and_(β)//_(α).Multiple sub-variants in eachαvariant were observed for the first time.The anisotropy in the mechanical properties was mainly related to the relative amount of sixαvariants.While the horizontally-oriented samples had a lower yield strength,they exhibited a higher ductility and longer fatigue life than the vertically-oriented samples.Cyclic softening occurred at higher strain amplitudes,and cyclic stabilization sustained at lower strain amplitudes.Fatigue crack mainly initiated from the specimen surface at lower strain amplitudes,while multiple crack initiation tended to occur at higher strain amplitudes.Crack propagation was characterized by fatigue striations along with some secondary cracks.

关键词： Titanium alloy 3D printing Deformation behavior Anisotropy Burgers orientation relationship

低密度Ti_(2)AlNb基合金热轧板微观组织的热稳定性

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金属学报 2023年第6期59卷 777-786页

作者：冯艾寒陈强王剑王皞曲寿江陈道伦同济大学材料科学与工程学院上海200092 西南技术工程研究所重庆400039 宝钛集团有限公司宝鸡721014 上海理工大学材料与化学学院增材制造研究院上海200093 Department of Mechanical and Industrial Engineering Toronto Metropolitan UniversityTorontoOntario M5B 2K3Canada

采用OM、SEM、XRD和TEM研究了低密度Ti_(2)AlNb基合金热轧板在600~1100℃保温12 h微观组织的热稳定性。结果表明,Ti_(2)AlNb基合金原始态热轧板主要由α_(2)、B2以及O相组成,颗粒状的α_(2)相分布在B2相基体中。Ti_(2)AlNb基合金热轧板... 详细信息

采用OM、SEM、XRD和TEM研究了低密度Ti_(2)AlNb基合金热轧板在600~1100℃保温12 h微观组织的热稳定性。结果表明,Ti_(2)AlNb基合金原始态热轧板主要由α_(2)、B2以及O相组成,颗粒状的α_(2)相分布在B2相基体中。Ti_(2)AlNb基合金热轧板600℃保温12 h,颗粒状的α_(2)相分布在B2相基体中,B2相基体中分布着大量细小的O相板条。随着温度的升高,合金热轧板800~900℃保温12 h的微观组织由α_(2)、B2以及O相三相构成,α_(2)相颗粒逐渐球化,O相板条粗化并固溶于B2相基体中。当温度升高至950℃时,B2相基体中的O相板条消失。合金热轧板在950~1000℃保温12 h形成α_(2)+B2两相区,α_(2)相颗粒球化并趋向于分布在B2相基体的晶界处。当温度升高至1100℃时,合金基体为B2单相,B2晶界处分布着极少量的残留α_(2)相颗粒。Vickes显微硬度分布结果显示,随着温度的升高,合金板材在600℃时硬度达到峰值(509 HV),这与大量细小的O相板条有关。

关键词： Ti_(2)AlNb基合金相变轧板微观组织热稳定性

Latest research advances on magnesium and magnesium alloys worldwide

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Journal of Magnesium and Alloys 2020年第1期8卷 1-41页

作者： Jiangfeng Song Jia She daolun Chen Fusheng Pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Department of Mechanical and Industrial Engineering Ryerson UniversityTorontoOntario M5B 2K3Canada

In the past two years,significant progresses have been achieved in high-performance cast and wrought magnesium and magnesium alloys,magnesium-based composites,advanced cast technologies,advanced processing technologies,and functional magnesium materials,such as Mg ion batteries,hydrogen storage Mg materials,bio-magnesium alloys,etc.Great contributions to the development of new magnesium alloys and their processing technologies have been made by Chongqing University,Shanghai Jiaotong University,Chinese Academy of Sciences,Helmholtz Zentrum Geesthacht,Queensland University,Brunel University,etc.This review paper is aimed to summarize the latest important advances in cast magnesium alloys,wrought magnesium alloys and functional magnesium materials worldwide in 2018–2019,including both the development of new materials and the innovation of their processing technologies.Based on the issues and challenges identified here,some future research directions are suggested,including further development of high-performance magnesium alloys having high strength and superior plasticity together with high corrosion resistance and low cost,and fundamental research on the phase diagram,diffusion,precipitation,etc.,as well as the development of advanced welding and joining technology.

关键词： Cast magnesium alloys Wrought magnesium alloys Functional magnesium materials Cast and processing technologies Corrosion and surface treatment International standard

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金属材料超声波点焊研究进展

材料导报 2020年第11期34卷 11064-11070页

作者：彭和 Chen daolun 蒋显全白雪飞西南大学工程技术学院重庆400715 瑞尔森大学机械与工业工程系多伦多M5B 2K3 西南大学材料与能源学院重庆400715 重庆市科学技术研究院新材料中心重庆400715

超声波点焊是一种固态焊接技术,其热影响区小,焊接强度高,能耗低、接头导电性好,为科技界和产业界所关注。该技术的缺点是对工件的厚度及硬度比较敏感,当厚度和硬度增加时,焊接系统将变得不稳定,需要更大的金属表面抓紧力和焊接功率;在... 详细信息

超声波点焊是一种固态焊接技术,其热影响区小,焊接强度高,能耗低、接头导电性好,为科技界和产业界所关注。该技术的缺点是对工件的厚度及硬度比较敏感,当厚度和硬度增加时,焊接系统将变得不稳定,需要更大的金属表面抓紧力和焊接功率;在焊接异种金属时,界面扩散形成的金属间化合物造成焊接界面力学性能失控,影响产品的使用性能。近年来,研究者们主要围绕以下方面试图改善超声波点焊技术:改进优化焊接工具,提高表面抓紧力;研究大功率超声波焊接系统稳定性和焊接结合机理;通过植入中间层来抑制扩散层。所开展的研究主要集中在大功率超声波点焊装置,研究对象由丝、线的焊接转变为研究具有一定厚度和硬度的板材的焊接,关键课题包括焊齿齿形优化和电热辅助条件下的焊接,超声软化理论和微焊点扩展理论,中间层的强化机理等。得益于一系列成果的取得,超声波点焊的焊接性能有了提升,为其工业应用奠定了基础。本文归纳了超声波点焊的研究进展,包括超声波点焊的原理和特点,焊接工具的优化与改进,焊接界面的结合机制,焊接界面温度模拟仿真,焊接工艺、组织和性能等。

关键词：固态焊接超声波点焊界面结合机制焊接工艺组织性能

Automatic well test interpretation based on convolutional neural network for a radial composite reservoir

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Petroleum Exploration and Development 2020年第3期47卷 623-631页

作者： LI daolun LIU Xuliang ZHA Wenshu YANG Jinghai LU Detang Hefei University of Technology Hefei 230009China Daqing Well Logging Technology Service Company Daqing 163453China University of Science and Technology of China Hefei 230026China

An automatic well test interpretation method for radial composite reservoirs based on convolutional neural network(CNN) is proposed, and its effectiveness and accuracy are verified by actual field data. In this paper, based on the data transformed by logarithm function and the loss function of mean square error(MSE), the optimal CNN is obtained by reducing the loss function to optimize the network with "dropout" method to avoid over fitting. The trained optimal network can be directly used to interpret the buildup or drawdown pressure data of the well in the radial composite reservoir, that is, the log-log plot of the given measured pressure variation and its derivative data are input into the network, the outputs are corresponding reservoir parameters(mobility ratio, storativity ratio, dimensionless composite radius, and dimensionless group characterizing well storage and skin effects), which realizes the automatic initial fitting of well test interpretation parameters. The method is verified with field measured data of Daqing Oilfield. The research shows that the method has high interpretation accuracy, and it is superior to the analytical method and the least square method.

关键词： radial composite reservoir well testing interpretation convolutional neural network automatic interpretation artificial intelligence

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