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Journal of Rare Earths 2006年第5期24卷 513-518页

作者： Antonius Indarto Jae-Wook Choi Hwaung Lee Hyung Keun Song Jelliarko Palgunadi clean Technology research Center Korea Institute of Science and Technology KoreaDepartment of Chemical and Biological Engineering Korea University Korea clean Technology research Center Korea Institute of Science and Technology Korea Hydrogen energy research Center Korea Institute of Science and Technology Korea

A 1% Fe-30% Hf over yttria-stabilized zirconia catalyst in combination with novel plasma-assisted activation techniques for a direct partial oxidation of methane to methanol was tested using dielectric barrier discharge plasma at ambient temperature and atmospheric pressure. However, instead of methanol, the reaction products were dominated by HE, CO, CO2, C2, and H2O. A catalytically activated plasma process increased the production of methanol compared with a noncatalytic plasma process. The maximum selectivity of methanol production was achieved using a catalyst that was treated at higher applied power.

关键词： methane oxidation dielectric barrier discharge catalyst plasma activation rare earths

Recent progress of amine modified sorbents for capturing CO2 from flue gas

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Chinese Journal of Chemical Engineering 2018年第11期26卷 2292-2302页

作者： Xinglei Zhao Qian Cui BaodengWang Xueliang Yan Surinder Singh Feng Zhang Xing Gao Yonglong Li National Institute of clean and Low Carbon energy (NICE) Beijing 102211 China NICE America research Mountain View CA USA

Under the Paris agreement, China has committed to reducing CO_2 emissions by 60%–65% per unit of GDP by *** CO_2 emissions from coal-fired power plants currently account for over 30% of the total carbon emissions in China, it will be necessary to mitigate at least some of these emissions to achieve this goal. Studies by the International energy Agency(IEA) indicate CCS technology has the potential to contribute 14% of global emission reductions, followed by 40% of higher energy efficiency and 35% of renewable energy, which is considered as the most promising technology to significantly reduce carbon emissions for current coal-fired power ***, the announcement of a Chinese national carbon trading market in late 2017 signals an opportunity for the commercial deployment of CO_2 capture ***, the only commercially demonstrated technology for post-combustion CO_2 capture technology from power plants is solvent-based absorption. While commercially viable, the costs of deploying this technology are high. This has motivated efforts to develop more affordable alternatives, including advanced solvents, membranes,and sorbent capture systems. Of these approaches, advanced solvents have received the most attention in terms of research and demonstration. In contrast, sorbent capture technology has less attention, despite its potential for much lower energy consumption due to the absence of water in the sorbent. This paper reviews recent progress in the development of sorbent materials modified by amine functionalities with an emphasis on material characterization methods and the effects of operating conditions on performance. The main problems and challenges that need to be overcome to improve the competitiveness of sorbent-based capture technologies are discussed.

关键词： CO2 sorbent Amine Flue gas CO2 adsorption CO2 regeneration

Reconstruction of solid oxide fuel cell electrode microstructure and analysis of its effective conductivity

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Science Bulletin 2016年第1期61卷 78-85页

作者： Keqing Zheng Meng Ni Building energy research group Department of Building and Real Estate The Hong Kong Polytechnic University Environmental energy research group Research Institute for Sustainable Urban Development (RISUD) The Hong Kong Polytechnic University

The effective conductivity （aeff） of solid oxide fuel cell （SOFC） electrode is an important parameter for predicting the ohmic loss in SOFC. This paper investigates the effective conductivity of SOFC electrodes recon- structed numerically by packing spherical particles in a computational domain, followed by a dilation process to simulate the sintering procedure. The effects of various parameters on the effective conductivity of the electrodes are investigated, including material composition, porosity, particle size and contact angle. Results show that the effective conductivity ratio （aeff/ao） of the computed con- ducting phase is mainly affected by its total volume frac- tion （VF） in electrode （including the porosity）. The effective conductivity can be improved by increasing the VF, electrode particle size or the contact angle between electrode particles. Based on the numerical results, the conventional percolation model for the calculation of O＇eft is improved by adjusting the Bruggeman factor from 1.5 to 2.7. The results are useful for understanding the microstructure properties of SOFC composite electrode and for subsequent electrode optimization.

关键词： Fuel cell Electrode Conductivity Modeling Random particle packing

Numerical study of particle behaviours and heat transfer in a complex rotary kiln

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Particuology 2024年第9期92卷 81-94页

作者： Qingshan Jian Hailin Gu Kaige Wang Shuai Wang Mingxiu Zhan Jinqing Wang Longjie Ji Zuohe Chi Guangxue Zhang The Institute for energy Engineering China Jiliang UniversityHangzhou310000China Qingshanhu energy research Center Zhejiang UniversityHangzhou311305China State Key Laboratory of clean energy Utilization Zhejiang UniversityHangzhou310027China Beijing Construction Engineering group Environmental Remediation Co. LtdBeijing100015China

Rotary kiln is widely used for thermal disposal of solid waste due to its effectiveness and high efficiency in recent *** further improve the processing efficiency,a newly designed rotary kiln with three-section structure is proposed,and the behaviours of particle motion and heat transfer are ***,a lab-scale rotary kiln is manufactured,and experiments are carried *** by experimental data,a CFD-DEM numerical model is developed to analyze the particle motion and heat transfer characteristics with the effects of inlet flue gas temperature,feeding rate and rotating *** results show that the outlet temperature increases linearly with the flue gas temperature,while it is negatively correlated with the feeding rate and rotating *** addition,the volumetric heat transfer coefficient in this complex rotary kiln is analyzed,the overall heat transfer coefficient is between 200 and 700 W/(m^(3)K).

关键词： Rotary kiln Lifter Particlemotion Heat transfer CFD-DEM

Gas-solid Flow Characteristics in High-density CFB

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Journal of Thermal Science 2012年第4期21卷 354-358页

作者： Xue-yao Wang Bao-guo Fan Sheng-dian Wang Xiang Xu Yun-han Xiao research Center for clean energy and Power Chinese Academy of SciencesKey Laboratory of Advanced Energy and Power Chinese Academy of Sciences (Institute of Engineering Thermophysics) Beijing China

The gas-solid flow characteristics in the riser of a high density CFB of square (0.27 m×0.27 m×10.4 m) or circu-lar (? 0.187m×10.4 m) cross section, using Geldart B particles (quartz sand), was investigated experimentally. The influence of riser structure on the hydrodynamic behaviors of a high-density circulating fluidized bed was investigated. The solid circulation rate was up to 321 kg/(m2s) with the circular cross-section under the operating conditions of the main bed air velocity 12.1 m/s and loosen wind and back-feed wind flow 25.1 m3/h. Different operating conditions on realizing high density circulation was analyzed, while both solids circulation rate and particle holdup depended highly on operating conditions. The circulating gas-solid flow was accompanied by an evidently-dense character in the riser's bottom zone and became fully developed in the middle and upper zones.

关键词： HDCFB gas-solid flow solids circulation rate

Preparation of chitosan and citric acid crosslinked membrane and its application in quasi-solid supercapacitors

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Rare Metals 2023年第2期42卷 430-437页

作者： Hao-Hang Xu Liang Yue Yang Tang Fan Liu Hong-Jiu Zhu Shu-Juan Bao Institute for clean energy&Advanced Materials School of Materials and EnergySouthwest UniversityChongqing400715China

Quasi-solid electrolytes promote the development of safe and flexible energy storage *** this work,a chitosan and citric acid crosslinked membrane is prepared by a freeze-thaw cross-linking method,in which the chemical crosslinking of chitosan and citric acid increase the viscoelastic behavior of the polymer membrane,and the freeze-thaw assist freeze drying process to create abundant interconnected open-pores and three-dimensional(3D)*** to the good viscoelasticity,excellent electrolyte loading capacity(596%)and high ion conductivity(7.7×10^(-3)S·cm^(-)1),as quasi-solid electrolyte,our proposed chitosan and citric acid crosslinked membrane helps ZnICCFT-ZnSO4lAC hybrid supercapacitor to delivers wide operating voltage,high specific capacity of 100.5 F·g^(-1)and stable cycle life(93%after1000 cycles),which suggests that our proposed freezethaw assisted freeze drying method has great potential in designing quasi-solid state electrolyte for energy storage device.

关键词： Quasi-solid electrolyte Chitosan Freeze-thaw Hybrid supercapacitor

Advances in air pollution control for vessels in China

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Journal of Environmental Sciences 2023年第1期123卷 212-221页

作者： Yanping Yang Yue Gong Ying Wang Xuecheng Wu Zhiying Zhou Weiguo Weng Yongxin Zhang State Key Laboratory of clean energy Utilization College of Energy EngineeringZhejiang UniversityHangzhou 310027China energy Engineering Design and research Institute Co.Ltd. Zhejiang UniversityHangzhou 310027China

Vessel emissions have contributed a great deal to air quality deterioration in ***,the Chinese government has promulgated a series of stringent emission *** is in this context that vessel emission control technology research is in full *** particular,during the 13th Five-Year Plan,the air pollution control technology of vessels has greatly *** emission control has followed two main governance routes:source emission reduction and aftertreatment *** control focuses on alternative fuels,with two main directions,the development of new fuels and the modification of existing ***,after-treatment technologies have also been developed,including wet desulfurization technology using seawater or alkaline liquids as wet washing liquids and selective catalytic reduction(SCR)for the control of NOx *** to China’s increasingly stringent emissions standards and regulations,work on the development of clean alternative fuels and further upgrading the collaborative application of after-treatment technologies to meet the near-zero-emissions requirements of vessels is still necessary.

关键词： Vessels Legislation Emission control Liquefied natural gas Desulfurization Selective catalytic reduction

research of the Gas-solid Flow Character Based on the DEM Method

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Journal of Thermal Science 2011年第6期20卷 521-526页

作者： Xueyao Wang and Yunhan Xiao research Center for clean energy and Power,Chinese Academy of Sciences Key Laboratory of Advanced energy and Power,Chinese Academy of Sciences (Institute of Engineering Thermophysics),Beijing,100190,China research Center for clean energy and Power Chinese Academy of Sciences Beijing China Key Laboratory of Advanced energy and Power Chinese Academy of Sciences (Institute of Engineering Thermophysics) Beijing China

Numerical simulation of gas-solid flow behaviors in a rectangular fluidized bed is carried out three dimensionally by the discrete element method (DEM).Euler method and Lagrange method are employed to deal with the gas phase and solid phase *** collided force among particles,striking force between particle and wall,drag force,gravity,Magnus lift force and Saffman lift force are considered when establishing the mathematic ***-sphere model is used to describe the collision of *** addition,the Euler method is also used for modeling the solid phase to compare with the results of *** flow patterns,particle mean velocities,particles' diffusion and pressure drop of the bed under typical operating conditions are *** results show that the DEM method can describe the detailed information among particles,while the Euler-Euler method cannot capture the micro-scale *** matter which method is used,the diffusion of particles increases with the increase of gas *** the gathering and crushing of particles cannot be simulated,so the energy loss of particles' collision cannot be calculated and the diffusion by using the Euler-Euler method is *** addition,it is shown by DEM method,with strengthening of the carrying capacity,more and more particles can be schlepped upward and the dense suspension upflow pattern can be ***,the results given by the Euler-Euler method are not consistent with the real situation.

关键词： DEM gas-solid flow numerical simulation

Nano-Ni-Induced Electronic Modulation of MoS_(2) Nanosheets Enables energy-Saving H_(2) Production and Sulfide Degradation

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energy & Environmental Materials 2024年第3期7卷 228-235页

作者： Fan Liu Xinghong Cai Yang Tang Wenqian Liu Qianwei Chen Peixin Dong Maowen Xu Yangyang Tan Shujuan Bao Institute for clean energy&Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715China

Electrocatalytic hydrogen evolution and sulfion(S^(2-))recycling are promising strategies for boosting H_(2)production and removing environmental ***,a nano-Ni-functionalized molybdenum disulfide(MoS_(2))nanosheet was assembled on steel mesh(Ni-MoS_(2)/SM)for use in sulfide oxidation reaction-assisted,energy-saving H_(2)*** and theoretical calculation results revealed that anchoring nano-Ni on high-surface-area slack MoS_(2)nanosheets not only optimized catalyst adsorption of polysulfides but also played an important role in promoting hydrogen evolution reaction kinetics by absorbing OH_(ad),thereby greatly enhancing the catalytic performance toward sulfide oxidation reaction and hydrogen evolution ***,the Ni/MoS^(2-)based hydrogen evolution reaction+sulfide oxidation reaction system achieved nearly 100%hydrogen production efficiency and only consumed 61%less power per kWh than the oxygen evolution reaction+hydrogen evolution reaction system,which suggested our proposed Ni-MoS_(2)and novel hydrogen production system are promising for sustainable energy production.

关键词： hydrogen evolution reaction low energy consumption molybdenum disulfide sulfide oxidation reaction

Improving slurryability, rheology,and stability of slurry fuel from blending petroleum coke with lignite

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Petroleum Science 2015年第1期12卷 157-169页

作者： Jun-Hong Wu Jian-Zhong Liu Yu-Jie Yu Rui-Kun Wang Jun-Hu Zhou Ke-Fa Cen State Key Laboratory of clean energy Utilization Zhejiang University

Petroleum coke and lignite are two important fossil fuels that have not been widely used in China. Petroleum coke-lignite slurry （PCLS）, a mixture of petro- leum coke, lignite, water, and additives, efficiently utilizes the two materials. In this study, we investigate the effects of the proportion （7） of petroleum coke on slurryability, rheo- logical behavior, stability, and increasing temperature characteristics of PCLSs. The results show that the fixed- viscosity solid concentration （COo） increases with increasing 7. The ~Oo of lignite-water slurry （LWS, ~ = 0） is 46.7 %, compared to 71.3 % for the petroleum coke-water slurry （PCWS, c~ --- i00 %）, while that of PCLS is in between the two values. The rheological behavior of PCLS perfectly fits the power-law model. The PCWS acts as a dilatant fluid. As decreases, the slurry behaves first as an approximate Newtonian fluid, and then turns into a pseudo-plastic fluid that exhibits shear-thinning behavior. With increasing ct, the rigid sedimentation and water separation ratio （WSR） increase, indicating a decrease in the stability of PCLS. When α is 60-70 %, the result is a high-quality slurry fuel for industrial applications, which has high slurryability （ω0 = 57-60 %）, good stability （WSR 〈 2 %）, and superior pseudo-plastic behavior （n = 0.9）.

关键词： Petroleum coke Lignite Coal-water slurry Rheological characteristics Slurry stability