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Particuology 2024年第6期89卷 22-31页

作者： Zengcai Ji Guoliang Song Zihua Tang liwei sun Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Dalian National Laboratory for Clean Energy Dalian116023China

Coal-fired power generation stands as the most economically viable modulating power source in present-day *** holds the potential to offer prospective solutions to the challenges posed by the rapid expansion of intermittent,unpredictable,and unstable renewable energy *** particle thermal storage technology emerges as an effective means to enhance the flexibility of coal-fired circulating fluidized bed power *** attain an optimized structure for the solid particle thermal storage and release system in circulating fluidized bed units,experimental research was conducted on a 0.1 MWth circulating fluidized bed test *** study delved into the impact of ash storage bin geometries and the shapes of their feed-discharge valves on the control properties of solid particle *** experimental outcomes reveal that employing inverted m-shaped valve and dual U-shaped valves for feed control,alongside U-shaped valves and N-shaped valves for discharge control,both enable efficient and rapid storage and release of solid particles within the circulating fluidized *** similar air distribution conditions,the inverted m-shaped valve exhibits lower conveying energy consumption than the dual U-shaped valves,while the N-shaped valve excels in control characteristics over the U-shaped ***,the inverted m-shaped valve and the N-shaped valve demonstrate optimal overflow port heights,and the ash storage bin exhibits an optimum height-to-diameter ratio.

关键词： Solid particle Thermal storage System structure Transport regulation

Effect of Air Distribution on the Transport Characteristics of Solid Particles in the Thermal Storage and Release System of Circulating Fluidized Bed

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Journal of Thermal Science 2024年第4期33卷 1554-1563页

作者： JI Zengcai SONG Guoliang TANG Zihua sun liwei State Key Laboratory of Coal Conversion Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Dalian National Laboratory for Clean Energy Dalian116023China

Solid particle heat storage technology offers a potential solution to the challenges posed by the significant growth of renewable energy sources,particularly in terms of grid security and ***,it has the capability to optimize the energy utilization efficiency of the power *** order to investigate the transport regulation characteristics of solid particles in the thermal storage and release system of a circulating fluidized bed(CFB),a test rig with a capacity of 0.1 MW(th)was *** rig was utilized to systematically study the transport regulation characteristics of solid particles under the double U-type valve feed structure and U-type valve discharge *** experimental findings indicate that the system's design enables efficient and rapid storage and release of solid particles in the *** air distribution mode,specifically the double U-type valve feed structure and the U-type valve discharge structure,significantly influence the feed and discharge characteristics of the ash storage *** was observed that the impact of loose air on these characteristics is more substantial than that of the return air,irrespective of the feed structure or the return *** adjusting the feed and discharge rate,it is recommended to adopt a scheme that involves coarse adjustment through loose air and fine adjustment through return air.

关键词： solid particle thermal storage air distribution mode transport regulation

Biocompatible hierarchical zwitterionic polymer brushes with bacterial phosphatase activated antibacterial activity

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Journal of Materials Science & Technology 2022年第31期126卷 191-202页

作者： liwei sun Lingjie Song Xu Zhang Shuaishuai Yuan Shifang Luan State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China Key Laboratory of Biobased Polymer Materials of Shandong Provincial Education Department College of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China National Engineering Laboratory for Medical Implantable Devices WEGO Co.Ltd.Weihai 264210China

Hierarchical polymer brushes have been considered as an effective and promising method for preventing implant-associated infections via multiple antibacterial ***,a bacterial phosphatase re-sponsive surface with hierarchical zwitterionic structures was developed for timely dealing with the poly-meric implant-associated bacterial *** hierarchical polymeric architecture was subtly realized on model polypropylene(PP)substrate by sequential photo living grafting of poly(2-(dimethylamino)ethyl methacrylate(PDMAEMA)bottom layer and zwitterionic poly(sulfobetaine methacrylate)(PSBMA)upper layer,followed by the conversion of the PDMAEMA into the zwitterionic structure via succes-sive quaternization and phosphorylation *** to shielding the bottom polycations,the hi-erarchical zwitterionic polymer brushes guaranteed the surface with the optimal biocompatibility under the normal physiological *** bacteria are invaded,the surface bactericidal activity of the bottom layer can be rapidly and automatically activated owing to the transition triggered by bacterial phosphatase from zwitterion to ***,ameliorated by the upper layer,the hierarchical surface showed obvious adhesion resistance to dead bacterial cells and notably migrated the cytotoxic-ity of exposed polycation after completion of the bactericidal *** a proof-of-principle demonstration,this self-adaptive hierarchical surface with sensitive bacterial responsiveness and biocompatibility showed great potential in combating hernia mesh-related *** work provides a promising and universal strategy for the on-demand prevention of medical device-associated infections.

关键词： Bacterial infection Self-adaptive surface Bactericidal Antifouling Hierarchical polymer brushes

A review of fundamental factors affecting diesel PM oxidation behaviors

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Science China(Technological Sciences) 2018年第3期61卷 330-345页

作者： GAO JianBing MA ChaoChen XING ShiKai sun liwei HUANG LiYong School of Mechanical Engineering Beijing Institute of Technology Department of Mechanical Engineering Sciences University of Surrey School of Vocational and Technical Hebei Normal University

Diesel particulate matter(DPF) is usually employed to meet the stringent regulations on particulate matter(PM) emissions for diesel engine. To resolve the DPF regeneration problem, comprehensive information about the factors influencing PM oxidation behaviors must be understood. Large amounts of factors related to PM oxidation activity have been investigated, however, some relations are still ambiguous. This paper reviews the factors related to PM oxidation activity that the factors are divided into the engine-correlated and engine-uncorrelated factors. The methods with both advantages and disadvantages to test the oxidation behaviors are introduced. The microstructure and ingredient being fundamental factors affecting PM oxidation behaviors are as the principle line to correlate PM oxidation behaviors and engine-correlated factors. The relations of engine-correlated factors with oxidation behaviors are obtained though advanced technologies that are mutual complementation. The engine-uncorrelated factors are also reviewed that these factors are vital to oxidation activity changes. Multiple-factor analysis rather than single-factor analysis should be developed to make the oxidation behaviors of diesel PM more clear.

关键词： diesel PM oxidation behaviors microstructure ingredient

Well-dispersed Mn/g-C_(3)N_(4)as bifunctional catalysts for selective epoxidation of olefins and carbon dioxide cycloaddition

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Chinese Chemical Letters 2023年第12期34卷 150-154页

作者： Minxing Du Yuxia sun Jiaojiao Zhao Haiyan Hu liwei sun Yuehui Li State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICPCenter for Excellence in Molecular SynthesisLanzhou Institute of Chemical Physics(LICP)Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Epoxidation is an important chemical process for the production of epoxides,key building blocks in chemical *** great efforts being made to facilitate this process,it remains a significant challenge to develop cost-effective,environmental-friendly,and selective ***,we reported a highly dispersed Mn supported by g-C_(3)N_(4)(Mn/g-C_(3)N_(4))with Mn loading up to 2.56 wt%.The Mn/g-CN_(4)exhibited satisfied catalytic performance for olefin epoxidation with excellent conversion(91%),high selectivity(93%)as well as outstanding recycling *** analysis revealed the importance of Mn-N structure for the generation of active oxo-containing species and subsequent oxygen atom ***,an efficient synthesis of cyclic carbonates from styrene epoxide and CO_(2)has been achieved(88%conversion,89%selectivity)based on the polar Mn-N coordinated characteristics of Mn/g-C_(3)N_(4)catalyst.

关键词： Well-dispersed Mn catalyst Bifunctional catalyst Epoxidation CO_(2) Cycloaddition

Experimental Study on the Effect of Bed Material Amount and Fuel Particle Size on Load Change of Circulating Fluidized Bed

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Journal of Thermal Science 2023年第5期32卷 1758-1770页

作者： TANG Zihua SONG Guoliang JIANG Yu YANG Xueting JI Zengcai sun liwei Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Dalian 116023China

The large-scale integration of new energy generation has put forward higher requirements for the peak-shaving capability of thermal *** circulating fluidized bed(CFB)depends on the advantages of a wide load adjustment range and low cost of pollutant control to become a good peak shaving power ***,the large delay and inertia caused by its unique combustion mode make it very difficult to change the load *** further understand the factors that affect the load change of CFB,and explore the method of increasing CFB load change rate,the load change experiment on the combustion side was carried out in the 0.1 MW CFB experiment *** influence law of bed material amount and fuel particle size on load change of CFB combustion side was revealed for the first *** results indicated that the increase of bed material amount was beneficial to improve the load change rate on the combustion side of CFB and reduce the carbon content of fly ash,but had no obvious effect on NO_(x)*** the bed height at rest increased from 200 mm to 400 mm,the load change rate of the CFB combustion side load from 50%to 75%increased from 0.78%/min to 1.14%/min,and the carbon content of fly ash at 75%load decreased from 26.6%to 24.9%.In addition,the reduction of fuel particle size positively improved the load change rate on the combustion side of the CFB and reduced NO_(x)emission but had a negative effect on reducing the carbon content of fly *** the fuel particle size decreased from 0-1 mm to 0-0.12 mm,the load change rate of CFB combustion side load from 50%to 75%increased from 0.78%/min to 1.09%/min,and the NO_(x)emission and carbon content of fly ash at 75%load decreased from 349.5 mg/m^(3)to 194.1 mg/m^(3)and increased from 26.6%to 31.8%,respectively.

关键词： circulating fluidized bed load change rate bed material amount fuel particle size combustion characteristics emission characteristics

Comparison of the toxicity of silver nanoparticles and silver ions on the growth of terrestrial plant model Arabidopsis thaliana

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Journal of Environmental Sciences 2013年第9期25卷 1947-1955页

作者： Haifeng Qian Xiaofeng Peng Xiao Han Jie Ren liwei sun Zhengwei Fu College of Biological and Environmental Engineering Zhejiang University of Technology

Silver nanoparticles （AgNPs） are one of the most widely used nanomaterials, but the mechanism of AgNP toxicity in terrestrial plants is still unclear. We compared the toxic effects of AgNPs and Ag＋ on Arabidopsis thaliana at the physiological, ultrastructural and molecular levels. AgNPs did not affect seed germination; however, they showed stronger inhibitory effect on root elongation than Ag＋ . The results of transmission electron microscopy and metal content analysis showed that AgNPs could be accumulated in leaves. These absorbed AgNPs disrupted the thylakoid membrane structure and decreased chlorophyll content, which can inhibit plant growth. By comparison, a small amount of Ag＋ was absorbed by seedlings, and it did not pronouncedly affect chloroplast structure and other metal ion absorption as AgNPs did. Compared with Ag＋ , AgNPs could alter the transcription of antioxidant and aquaporin genes, indicating that AgNPs changed the balance between the oxidant and antioxidant systems, and also affected the homeostasis of water and other small molecules within the plant body. All the data from physiological, ultrastructural and molecular levels suggest that AgNPs were more toxic than Ag＋ .

关键词： silver nanoparticles Ag+ Arabidopsis thaliana gene transcript antioxidant enzyme aquaporins

Microstructure of Pd_(77.5)Au_6Si_(16.5) Alloy Droplet Solidified in a Drop Tube Process

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Journal of Materials Science & Technology 1996年第5期12卷 385-388页

作者： Liling sun Qi WU liwei sun and Wenkui WANG (Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China) Institute of Physics Chinese Academy of Sciences Beijing 100080 China

The microstructure development of Pd77.5Au6Si16.5 alloy droplet solidified in a drop tube process was studied. It was found that two distinct microstructures, i.e. (Pd,Au)3Si primary phase and Pd+(Pd,Au)3Si eutectic can be obtained when the droplet diameter is within the range between 2.3~0.4 mm. The morpologies of the (Pd,Au)3Si developed from dendrite trunk-like with single branching only into dendrite cluster-like with ternary branching with the decrease of the droplet diameter. When the droplet diameter is about 0.25 mm, the primary phase (Pd,Au)3Si almost disappears and the microstructure mainly shows Pd+(Pd,Au)3Si eutectic. The morphology of the eutectic transforms from fiber-like to plate-like with the decrease of the droplet diameter in the range between 2.3-0.25 mm. When the droplet diameter is about 0.19 mm, the microstructure is only the single phase of Pd solid solution

关键词： Microstructure of Pd Au6Si Alloy Droplet Solidified in a Drop Tube Process

Sinter-resistant and high-efficient Pt/CeO2/NiAl2O4/Al2O3@SiO2 model catalysts with “composite energy traps”

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Science China Chemistry 2020年第4期63卷 519-525页

作者： Jingwei Li Kai Li liwei sun Zeshu Zhang Zhijian Wu Yibo Zhang Xiangguang Yang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Institute of Carbon Materials Science Shanxi Datong UniversityDatong 037009China Jilin Provincial Key Laboratory of Green Chemistry and Process Changchun Institute of Applied ChemistryChangchun 130022China

The stability of nanosized catalysts at high temperature is still a challenging topic and is a crucial criterion to evaluate their suitability for industrial use. Currently, the strategy to improve the high-temperature stability of nano-sized catalysts is to restrict the migration of particles on the surface, which, however, lacks theoretical knowledge and directions. Herein, we reported a new approach that can effectively inhibit the migration and agglomeration of supported nanoparticles by fabrication of a model catalyst Pt/CeO2/NiAl2O4/Al2O3@SiO2. This catalyst is highly stable with the microstructure unchanged even after being aged at 1000 °C. Density functional theory calculations indicate that two types of confinement effects exist in the catalyst and their mechanisms were well explained from the viewpoint of "energy traps" which can also be applied to other supported catalysts.

关键词： stability of nanosized catalysts the migration and agglomeration of supported nanoparticles energy trap two types of confinement effects

Radiometric Calibration Chain Design Based on Uniform Collimated Laser Source

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Journal of Beijing Institute of Technology 2018年第3期27卷 385-390页

作者： liwei sun Xin Ye Wei Fang Zhenlei He Yupeng Wang Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences

A uniform collimated laser source,composed of the integrating sphere source and the off-axis parabolic,is *** calibration process is analyzed theoretically,and Monte Carlo ray tracing method is used to simulate and analyze the design *** results show that when the calibration source is composed of an 8 cm diameter integral sphere,10 mm diameter exit port,and 1 000 mm focal length,and an off-axis angle 60°parabolic mirror,the maximum divergence angle is 7.5 mrad and the uniformity of irradiance is 99.31%.Finally,the uncertainty of radiometric calibration process is analyzed,and the calibration accuracy of 0.335%for imaging spectrometer can be achieved by using the radiation calibration laser source.

关键词： transfer radiometer radiometric calibration laser source uniformity