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Optimizing the sulfur-resistance and activity of perovskite oxygen carrier for chemical looping dry reforming of methane

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Journal of energy Chemistry 2024年第9期96卷 259-271页

作者： Yuelun Li Dong Tian Lei jiang Huicong Zuo LiNan Huang Mingyi Chen Jianchun Zuo Hua Wang Kongzhai Li Engineering Research Center of metallurgical energy Conservation and emission reduction Ministry of EducationKunming University of Science and TechnologyKunming 650093YunnanChina Faculty of metallurgical and energy Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina State key laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093YunnanChina

Perovskite oxides has been attracted much attention as high-performance oxygen carriers for chemical looping reforming of methane,but they are easily inactivated by the presence of trace H_(2)***,we propose to modulate both the activity and resistance to sulfur poisoning by dual substitution of Mo and Ni ions with the Fe-sites of LaFeO_(3)*** is found that partial substitution of Ni for Fe substantially improves the activity of LaFeO_(3)perovskite,while Ni particles prefer to grow and react with H_(2)S during the long-term successive redox process,resulting in the deactivation of oxygen *** the presence of Mo in LaNi_(0.05)Fe_(0.95)O_(3−σ)perovskite,H_(2)S preferentially reacts with Mo to generate MoS_(2),and then the CO_(2)oxidation can regenerate Mo via removing *** addition,Mo can inhibit the accumulation and growth of Ni,which helps to improve the redox stability of oxygen *** LaNi_(0.05)Mo_(0.07)Fe_(0.88)O_(3−σ)oxygen carrier exhibits stable and excellent performance,with the CH_(4)conversion higher than 90%during the 50 redox cycles in the presence of 50 ppm H_(2)S at 800℃.This work highlights a synergistic effect in the perovskite oxides induced by dual substitution of different cations for the development of high-performance oxygen carriers with excellent sulfur tolerance.

关键词： Perovskite oxygen carriers Chemical looping reforming Sulfur-resistance Dual substitution Syngas

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Screening the optimal Co_(x)/CeO_(2)(110)(x=1–6)catalyst for methane activation in coalbed gas

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International Journal of Coal Science & Technology 2024年第3期11卷 256-271页

作者： Li’nan Huang Danyang Li Lei Jiang Zhiqiang Li Dong Tian Kongzhai Li Engineering Research Center of metallurgical energy Conservation and emission reduction Ministry of EducationKunming University of Science and TechnologyKunming650093China Faculty of metallurgical and energy Engineering Kunming University of Science and TechnologyKunming650093China State key laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming650093China

The challenges posed by energy and environmental issues have forced mankind to explore and utilize unconventional energy *** is imperative to convert the abundant coalbed gas(CBG)into high value-added products,i.e.,selective and efficient conversion of methane from *** activation,known as the“holy grail”,poses a challenge to the design and development of *** structural complexity of the active metal on the carrier is of particular *** this work,we have studied the nucleation growth of small Co clusters(up to Co_(6))on the surface of CeO_(2)(110)using density functional theory,from which a stable loaded Co/CeO_(2)(110)structure was selected to investigate the methane activation *** the relatively small size of the selected Co clusters,the obtained Co_(x)/CeO_(2)(110)exhibits interesting *** optimized Co_(5)/CeO_(2)(110)structure was selected as the optimal structure to study the activation mechanism of methane due to its competitive electronic structure,adsorption energy and binding *** energy barriers for the stepwise dissociation of methane to form CH3^(*),CH2^(*),CH^(*),and C^(*)radical fragments are 0.44,0.55,0.31,and 1.20 eV,respectively,indicating that CH^(*)dissociative dehydrogenation is the rate-determining step for the system under investigation *** fundamental study of metal-support interactions based on Co growth on the CeO_(2)(110)surface contributes to the understanding of the essence of Co/CeO_(2) catalysts with promising catalytic *** provides theoretical guidance for better designing the optimal Co/CeO_(2) catalyst for tailored catalytic reactions.

关键词： Co cluster growth Ce-based catalysts Methane activation DFT

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Investigation on combustion and emission characteristics of diesel polyoxymethylene dimethyl ethers blend fuels with exhaust gas recirculation and double injection strategy

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第4期11卷 614-630页

作者： Xin Su Rui Su Nan Gao Hao Chen Zhenhua Ji Hongming Xu Biao Wang Shaanxi key laboratory of New Transportation energy and Automotive energy saving Chang'an University School of Vechicle Engineering Xi'an Aeronautical University Department of Mechanical Engineering University of Birmingham

As a kind of renewable and high oxygen content fuel, polyoxymethylene dimethyl ether（PODE） can be added in diesel to realize energy saving and emissions reduction. To evaluate the combustion and emission characteristics of a diesel engine fueled with diesel and diesel/PODE mixtures, exhaust gas recirculation（EGR） and main-pilot injection strategies with various injection timings were applied. PODE was blended with diesel by volume to form mixtures which were marked as D100（pure diesel）, D90P10（90% diesel + 10% PODE）,and D80P20（80% diesel + 20% PODE）. The results showed that the ignition delay（ID） and combustion duration（CD） of D80P20 were the shortest because of the highest cetane number（CN） and high oxygen content of PODE, indicating more concentrated heat *** low and medium loads, D80P20 achieved the highest peak heat release ratio（PHRR） and peak combustion temperature（PCT） among the three fuels, and it was 14.3% and 3.6%higher than those of D100. PODE blending with diesel can significantly reduce particulate matter（PM） and D80P20 has the lowest PM emissions at all loads. Compared with D100,both PM and nitrogen oxide（NOx） emissions of PODE blends decreased simultaneously with 20% EGR at all loads. With the increase of pilot-main interval, the ID and CD of all test fuels increased, while the NOxand PM emissions decreased. The conclusions of the present research provide a state of the application in light-duty engines fueled with diesel/PODE blends in future work.

关键词： Polyoxymethylene dimethyl ethers Diesel engine NO x Particulate number Pilot plus main injections

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Numerical analysis of behavior of active layer in rotary kilns by discrete element method

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Journal of Central South University 2013年第3期20卷 634-639页

作者：谢知音冯俊小 School of Mechanical Engineering University of Science and Technology Beijing beijing key laboratory for energy saving and emission reduction of metallurgical industry

The behavior of the active layer of material bed within rotary kilns plays a key role in industrial *** obtain its influences on industrial process,different regimes of particle motion have been simulated by discrete element method(DEM) in three dimensions under variant rotation speeds,filling degree,based on the background of induration process of iron ore *** influences of the mentioned factors on the maximum thickness of the active layer and the average velocity of particles have been *** average velocity of particles increases with Froude number following the power function over a wide range,and the maximum thickness rises with increasing rotation speed in a way of *** influence of the filling degree f on the maximum thickness exhibits a good linearity under two classic regimes,but the increasing of the average velocity of the active layer is limited at f=*** basic research highlights the impact of the active layer within rotary kilns,and lays a good foundation for the further investigation in mixing and heat transfer within the particle bed inside rotary kilns.

关键词： rotary kiln particle motion discrete element method active layer

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Kinetic study on the direct nitridation of silicon powders diluted with α-Si_3N_4 at normal pressure

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International Journal of Minerals,Metallurgy and Materials 2013年第5期20卷 493-498页

作者： Shao-wu Yin Li Wang Li-ge Tong Fu-ming Yang Yan-hui Li School of Mechanical Engineering University of Science and Technology Beijing beijing key laboratory of energy saving and emission reduction for metallurgical industry University of Science and Technology Beijing

Silicon nitride （Si3N4） powders were prepared by the direct nitridation of silicon powders diluted with a- Si3N4 at normal pressure. Silicon powders of 2.2 μm in average diameter were used as the raw materials. The nitriding temperature was from 1623 to 1823 K, and the reaction time ranged from 0 to 20 min. The phase compositions and morphologies of the products were analyzed by X-ray diffraction and scanning electron microscopy, respectively. The effects of nitriding temperature and reaction time on the conversion rate of silicon were determined. Based on the shrinking core model as well as the relationship between the conversion rate of silicon and the reaction time at different temperatures, a simple model was derived to describe the reaction between silicon and nitrogen. The model revealed an asymptotic exponential trend of the silicon conversion rate with time. Three kinetic parameters of silicon nitridation at atmospheric pressure were calculated, including the pre-exponential factor （2.27 cm.s^-1） in the Arrhenius equation, activation energy （114 kJ·mol^-1）, and effective diffusion coefficient （6.2×10-s cm2.s^-1）. A formula was also derived to calculate the reaction rate constant.

关键词： silicon nitride powders nitridation reaction kinetics activation energy

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Exploring a new path of green and efficient utilization of sinter return fine to produce composite pellets

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Journal of Iron and Steel Research International 2024年第7期31卷 1610-1622页

作者： Yan-biao Chen Wen-guo Liu Hao Guo Jing-song Wang Qing-guo Xue Hai-bin Zuo State key laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China MCC Capital Engineering and Research Incorporation Limited Beijing 100176China

Efficient utilization of sinter return fine is an important measure to reduce cost,increase efficiency,save energy and reduce emission.A new path of green and efficient utilization of return fine was proposed to produce composite *** metallurgical properties of composite pellets under the condition of hydrogen-rich blast furnace were *** experimental results indicate that the coated concentrate was consolidated for the composite pellets through normal Fe_(2)O_(3) *** the surface of core return fine,the liquid phase formed due to its low-melting point,assimilated the adjacent concentrate,and then consolidated with the temperature *** with regular pellets,the com-pressive strength and reduction swelling index of composite pellets were decreased,but the reducibility index and softening-melting properties were *** addition,the reduction degradation index of composite pellets was sig-nificantly higher than that of ***,adding composite pellets was conducive to indirect reduction in blast furnace,reducing fuel ratio and improving production *** to the effect of the roasting system on the metallurgical properties,the roasting temperature and time were determined as 1250℃and 30 min,*** composite pellets can be produced under the traditional pelletizing process.

关键词： Sinter Return fine Composite pellet Roasting system metallurgical property Hydrogen-rich blast furnace

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energy saving analysis for CO_(2)–O_(2)mixed injection technology in converter steelmaking

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Journal of Iron and Steel Research International 2024年第5期31卷 1095-1103页

作者： Bao-chen Han Chun-liang Gao Ya-qiang Li Dan Liu Guang-sheng Wei Rong Zhu Hebei key laboratory of Material Near-Net Forming Technology School of Material Science and EngineeringHebei University of Science and TechnologyShijiazhuang050018HebeiChina Department of Automotive Engineering Hebei Vocational University of Technology and EngineeringXingtai054000HebeiChina School of metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

energy-saving in China's iron and steel industry still relies on the development and improvement of short-term energy saving ***,a special converter smelting technology incorporating energy saving was *** evaluate the energy-saving potential of the CO_(2)–O_(2)mixed injection(COMI)technology,collected production data were used to develop an improved techno-economic *** reveal that the technology can save energy through auxiliary material consumption,sensible heat of solid by-product,iron loss reduction,and energy *** application of COMI technology in an enterprise is cost effective,involving the energy saving potential of 0.206 GJ/t,the cost of conserved energy of−48.83 yuan/GJ,and a simple payback period of 0.35 year for a 60-million-yuan *** analysis shows that the investment cost and discount rate primarily influence the cost of conserved energy of the *** the discount rate increased,the cost of conserved energy also gradually ***,the COMI technology is an energy-saving technology with good development prospects.

关键词： Converter steelmaking COMI technology energy saving Techno-economic model Investment cost

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Numerical simulation of the direct reduction of pellets in a rotary hearth furnace for zinc-containing metallurgical dust treatment

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International Journal of Minerals,Metallurgy and Materials 2013年第7期20卷 636-644页

作者： Yu-liang Wu Ze-yi Jiang Xin-xin Zhang Peng Wang Xue-feng She School of Mechanical Engineering University of Science and Technology Beijing beijing Engineering Research Center for energy saving and Environmental Protection University of Science and Technology Beijing beijing key laboratory for energy saving and emission reduction of metallurgical industry University of Science and Technology Beijing

A mathematical model was established to describe the direct reduction of pellets in a rotary hearth furnace （RHF）. In the model, heat transfer, mass transfer, and gas-solid chemical reactions were taken into account. The behaviors of iron metallization and dezincification were analyzed by the numerical method, which was validated by experimental data of the direct reduction of pellets in a Si-Mo furnace. The simulation results show that if the production targets of iron metallization and dezincification are up to 80% and 90%, respectively, the furnace temperature for high-temperature sections must be set higher than 1300~ C. Moreover, an undersupply of secondary air by 20% will lead to a decline in iron metallization rate of discharged pellets by 10% and a decrease in dezincing rate by 13%. In addition, if the residence time of pellets in the furnace is over 20 min, its further extension will hardly lead to an obvious increase in production indexes under the same furnace temperature curve.

关键词： rotary hearth furnaces direct reduction process dust ore pellets dezincification numerical methods

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Determination of void boundary in a packed bed by laser attenuation measurement

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Particuology 2020年第4期18卷 72-79页

作者： Yuanxiang Lu Zeyi Jiang Xinru Zhang Sihan Liu Jingsong Wang Xinxin Zhang School of energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China beijing key laboratory of energy saving and emission reduction for metallurgical industry Beijing 100083China beijing Engineering Research Center of energy saving and Environmental Protection Beijing 100083China State key laboratory of Advanced Metallurgy Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Voids are important regions in some industrial processes,particularly in the iron-making process,because a void is a zone in which gas-solid heat transfer and reactions *** paper presents a 3D experimental study of void formation measurement with 2D projection in a packed bed using an optical *** developing an experimental laser-attenuation scanning method,invisible voids that form in a packed bed can be detected and identified as relatively stable *** effects of various operational parameters on void formation are analyzed in terms of the resulting void sizes and *** results show that the void shape that forms in the packed bed is close to an ellipsoid and is relatively *** void size is positively correlated with the blast volume rate and is negatively correlated with the blowpipe *** blowpipe depth has no significant effect on either the void formation or *** blast angle affects the void location strongly;when this angle is increased,the void moves *** information and methods obtained in this experiment are significant in aiding understanding of the mechanism of void formation in gas-solid reactors.

关键词： Gas-solid reactor Void formation 3D experiment Optical method Laser attenuation

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Measuring Thermal Conductivity of an Individual Carbon Nanotube Using Raman Spectroscopy

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Journal of Thermal Science 2022年第4期31卷 1016-1022页

作者： LI Pei FENG Daili FENG Yanhui LIU Xiaofang XIONG Mengya ZHANG Xinxin LIU Jinhui School of energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China beijing key laboratory of energy saving and emission reduction for metallurgical industry University of Science and Technology BeijingBeijing 100083China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

In this paper,a non-contact method based on Raman spectroscopy was used to measure the thermal conductivity of an individual single-walled carbon nanotube(SWCNT)and a multi-walled carbon nanotube(MWCNT).The effect of laser-induced heating on carbon nanotubes(CNTs)was *** local temperatures along the longitudinal direction of carbon nanotube were determined by Raman shift,combined with one-dimensional heat conduction model,and the thermal conductivity was finally *** thermal conductivity of the SWCNT with a length of 25μm and a diameter of 1.34 nm decreases as the temperature increases in the measuring temperature range(316 K–378 K).The corresponding thermal conductivities change from 1651 W/(m·K)to 2423 W/(m·K);the thermal conductivities of the MWCNT with 40μm length and 9.2 nm diameter are within 1109–1700 W/(m·K)at 316 K–445 *** further analyze the size effect on the thermal conductivity,molecular dynamics simulation has been carried *** result shows that the thermal conductivity of an individual carbon nanotube increases with increasing nanotube length and eventually *** work is expected to provide some reference data for the studies of thermal properties of individual CNTs.

关键词： carbon nanotube thermal conductivity Raman spectroscopy molecular dynamics

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