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Influence of particle size on combustion behavior of bamboo char used for blast furnace injection

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Journal of Iron and Steel Research International 2018年第12期25卷 1213-1222页

作者： run-sheng xu Wei Wang Bo-wen Dai State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina

The combustion behavior of bamboo char and its relationship with particle sizes were evaluated using thermo-gravimetric *** results showed that the combustion properties of bamboo char were much better than those of the anthracite used as a coal injected for blast furnace ironmaking due to its porous structure,disordered microcrystalline and higher catalytic index of ash *** the particle size increased from -0.074 to 0.500-1.000 mm,the ignition temperature and burnout temperature of bamboo char increased,while the combustible index and comprehensive combustion characteristic index decreased *** apparent activation energies of non-isothermal combustion of bamboo char and anthracite were calculated based on the distributed activation energy *** results showed that the average activation energy was 162.86 kJ/mol for-0.074 mm anthracite,while it ranged from 71.01 to 89.44 kJ/mol for bamboo chars of different *** revealed that the combustion reactivity of bamboo char in the largest size (0.500-1.000 mm)was much better than that of -0.074 mm,anthracite;thus,the size of biomass char could be enlarged to the maximum size specified by the injection application of blast furnace.

关键词： Bamboo char Blast furnace injection Particle size Combustion characteristics Kinetics

Highly dispersed Ni/MgO-mSiO_(2)catalysts with excellent activity and stability for dry reforming of methane

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Nano Research 2022年第6期15卷 5004-5013页

作者： Fang Zeng Juan Zhang run xu Rongjun Zhang Jianping Ge Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Department of Coal and Syngas Conversion Research Institute of Petroleum ProcessingSINOPECBeijing 100083China

Highly dispersed Ni catalyst and alkaline promoters supported by mesoporous SiO_(2)nanospheres were synthesized and applied as an active and stable catalyst for dry reforming of methane(DRM).The as-prepared Ni/MgO-mSiO_(2)catalyst showed stable conversions of CH4 and CO_(2)around 82%and 85%in 120 h of DRM reaction,which was superior in performance compared to similar catalysts in *** on the transmission electron microscope(TEM)images,energy-dispersive spectroscopy(EDS),CO-pulse adsorption,temperature programmed reduction of the oxidized catalysts by hydrogen(H_(2)-TPR),X-ray photoelectron spectroscopy(XPS),temperature-programmed desorption of CO_(2)(CO_(2)-TPD),and thermal gravitational analysis(TGA),the promotion effect of MgO on the Ni catalyst was systematically *** introduction of Mg^(2+)in synthesis enhanced the interaction between Ni^(2+)and mSiO_(2),which led to a high dispersion of active centers and a strong“metal–support”interactions to inhibit the sintering and deactivation of Ni at reaction *** the other hand,Ni and MgO nanoparticles formed adjacently on mSiO_(2),where the“Ni-MgO”interface not only improved the Ni0 distribution and promoted the cracking of CH_(4)but also promoted the activation of CO_(2)and the elimination of carbon deposits.A high and stable conversion of CH4 and CO_(2)were then achieved through the synergistic effect of Ni catalyst,MgO promoter,and mSiO_(2)support.

关键词： Ni-based catalyst dry reforming of methane mesoporous SiO_(2) MgO alkaline

Development of Flake Powder Metallurgy in Fabricating Metal Matrix Composites:A Review

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Acta Metallurgica Sinica(English Letters) 2014年第5期27卷 806-815页

作者： Genlian Fan run xu Zhanqiu Tan Di Zhang Zhiqiang Li State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University

Powder metallurgy （PM） is one of the most applied processes in the fabrication of metal matrix composites （MMCs）. Recently, a novel PM strategy called flake PM was developed to fabricate MMCs with nano-laminated or hierarchical architectures. The name ＂flake PM＂ was derived from the use of flake metal powders, which could benefit the uniform dispersion of reinforcements in the metal matrices and thus result in balanced strength and ductility. Flake PM has been proved to be successful in the dispersion of nano aluminum oxides, carbon nanotubes, graphene nano-sheets, and microsized B4C particles in aluminum or copper matrix. This paper reviews the technique and mechanism developments of flake PM in previous studies, and foresees the future develop of this new fabricating method.

关键词： Metal matrix composites Flake powder metallurgy Micro- and nano-composites Architectures Strength and ductility

Non-isothermal study of gasification process of coal char and biomass char in CO_2 condition

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Journal of Iron and Steel Research International 2017年第10期24卷 985-990页

作者： Tao xu Guang-wei Wang Jian-liang Zhang Teng-fei Song run-sheng xu School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Materials and Metallurgy Wuhan University of Science and Technology

Non-isothermal method was used to study gasification characteristics of three coal chars and one biomass *** chars were made from anthracite coal（A）,bituminous coal（B）,lignite coal（L）,and wood refuse（W）,*** gasification process was studied by random pore model（RPM）,unreacted core model（URCM）and volumetric model（VM）.With an increase in metamorphic grade,the gasification reactivity of coal char decreased,and the gasification reactivity of biomass char was close to that of low metamorphic coal *** an increase in heating rate,the gasification of all samples moved towards high temperature zone,and the whole gasification time *** was concluded from kinetics analysis that the above-mentioned three models could be used to describe the gasification process of coal char,and the RPM fitted the best among the three *** the RPM,the activation energies of gasification were193.9,225.3 and 202.8 kJ/mol for anthracite coal char,bituminous coal char and lignite coal char,*** gasification process of biomass char could be described by the URCM and VM,while the URCM performed *** activation energy of gasification of wood refuse char calculated by the URCM was 282.0 kJ/mol.

关键词： Coal char Biomass char Gasification Kinetic model

Microchannel reactors for Fischer-Tropsch synthesis:Experimental investigation and mathematical modeling

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Chinese Journal of Chemical Engineering 2023年第12期64卷 224-240页

作者： Huili Cao run xu Xiaojin Tang Tao Yang Shuandi Hou Chaopeng Hou SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China

The Fischer-Tropsch synthesis is a significant technology for converting coal,natural gas,and biomass into synthetic *** recent years,the use of microchannel reactors for the Fischer-Tropsch synthesis has attracted significant ***-Tropsch synthesis experiments were carried out in a microchannel reactor and the influences of reaction conditions on the experimental results were investigated in this *** on the experimental data,a dynamic multi-component pseudo-homogeneous variable-volume flow model of microchannel reactors for the Fischer-Tropsch synthesis was built to determine the pressure-,velocity-,conversion-and(component-wise)concentration-distributions in reaction *** model takes into account the combined effects of gas volume expansion caused by the frictional pressure drop and gas volume contraction caused by reaction consumption.A novel effective method for calculating the pressure and superficial gas velocity values in microchannel reactors was proposed in the *** that,two sets of experimental data were selected from references to evaluate the validity and accuracy of the *** reaction performances in the microchannels were analyzed carefully based on the calculated results.

关键词： Fischer-Tropsch synthesis Microchannel reactors Modeling Variable-volume flow

Global Existence and Finite Time Blow-up for the m-Laplacian Parabolic Problem

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Acta Mathematica Sinica,English Series 2023年第8期39卷 1497-1524页

作者： Yue PANG Vicentiu D.RADULESCU run Zhang xu College of Mathematical Sciences Harbin Engineering UniversityHarbin 150001P.R.China Faculty of Applied Mathematics AGH University of Science and Technology30-059 Krak´owPoland Department of Mathematics University of CraiovaStreet A.I.Cuza No.13200585 CraiovaRomania

In this paper,we consider an initial boundary value problem of m-Laplacian parabolic equation arising in various physical *** tackle this problem at three different initial energy *** the sub-critical initial energy,we obtain the blow-up result and estimate the lower and upper bounds of the blow-up *** the critical initial energy,we show the global existence,asymptotic behavior,finite time blow-up and the lower bound of the blow-up *** the sup-critical initial energy,we prove the finite time blow-up and estimate the lower and upper bounds of the blow-up time.

关键词： m-Laplacian parabolic equation blow-up blow-up time global existence

Chemical recycling of polyolefins:a closed-loop cycle of waste to olefins

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National Science Review 2023年第9期10卷 92-109页

作者： Liang Zou run xu Hui Wang Zhiqiang Wang Yuhan Sun Mingfeng Li Sinopec Research Institute of Petroleum Processing Co. Ltd Shanghai Advanced Research Institute Chinese Academy of Sciences 2060 Research Institute Shanghai Tech University

The unsuitable disposal of plastic wastes has caused serious environmental pollution,and finding a green manner to address this problem has aroused wide *** wastes,especially polyolefin wastes,are rich in carbon and hydrogen,and chemical recycling shows distinct advantages in their conversion into olefins and realizes a closed-loop cycling of plastic *** wastes should be labeled before *** necessity for,and methods of,pretreatment are introduced in this paper and the whole recycling process of polyolefin wastes is also *** the core technology pyrolysis,including thermal,catalytic and solvolysis processes,is introduced in detail due to its potential for future *** also briefly describe the feasible strategies of pyrolytic oil refining and life cycle assessment of the chemical recycling *** addition,suggestions and perspectives concerning the industrial improvement of polyolefin chemical recycling are proposed.

关键词： polyolefins pretreatment chemical recovery product refining life cycle assessment

Research progress on multiscale structural characteristics and characterization methods of iron ore sinter

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Journal of Iron and Steel Research International 2020年第4期27卷 367-379页

作者： Wei Wang xu-heng Chen run-sheng xu Jun Li Wen-jun Shen Su-ping Wang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina Wuhan Branch of Baosteel Central Research Institute Wuhan 430083HubeiChina

At present,blast furnace ironmaking is still the main process for producing molten iron,and sinters are the main raw material for blast furnace ironmaking.A sinter with good metallurgical performance can not only ensure smooth operation of the blast furnace but also reduce the blast furnace fuel ratio and increase the molten iron *** is the most important factor affecting the metallurgical properties of the ***,the research progress of sinter pore and mineral phase structures was reviewed and the mechanism by which they influence sinter properties was *** characterization methods for the sinter and their advantages and disadvantages were introduced,and the future research direction of sinter was discussed.

关键词： Iron ore sinter Pore structure Mineral phase structure Characterization method Multiscale characterization

A single-cell encapsulation method based on a microfluidic multi-step droplet splitting system

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Chinese Chemical Letters 2015年第12期26卷 1450-1454页

作者： Chun-Guang Yang Ru-Yi Pan Zhang-run xu Research Center for Analytical Sciences Northeastern University

Single cell analysis is of great significance to understand the physiological activity of *** droplet is an ideal analytical platform for single-cell analysis. We developed a microfluidic droplet splitting system integrated with a flow-focusing structure and multi-step splitting structures to form 8-line droplets and encapsulate single cells in the droplets. Droplet generation frequency reached1021 Hz with the aqueous phase flow rate of 1 m L/min and the oil phase flow rate of 15 mL /min. Relative standard deviation of the droplet size was less than 5% in a single channel, while less than 6% in all the8 channels. The system was used for encapsulating human whole blood cells. A single-cell encapsulation efficiency of 31% was obtained with the blood cell concentration of 2.5 ？ 104cells/mL, and the multicellular droplet percentage was only 1.3%. The multi-step droplet splitting system for single cell encapsulation featured simple structure and high throughput.

关键词： encapsulation droplet splitting throughput disperse suspension deviation physiological focusing mixing