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Particuology 2023年第4期75卷 1-10页

作者： Hui Du Haifeng Lu Jie Tang Haifeng Liu shanghai engineering research center of coal gasification East China University of Science and TechnologyShanghai200237China

The rapid development of nanotechnology has led to a need to further understand the physical char-acteristics of *** this paper,the flow characteristics of micro-nano alumina particles with different particle sizes were *** FT4 powder rheometer and the PT-X powder tester were used to measure the compression,friction,and dynamic properties of *** compressibility increased significantly as the particle size decreased from 27 μm to 30 *** distribution in the silo was measured and predicted by Janssen's theory,with errors mostly less than 10%.The basic flow energy and the specific energy of the three powders were 4983,1734,and 244 mJ,and 6.80,11.70,and 6.70 mJ/g,respectively,indicating that there was no linear relationship between the change in flowability and particle *** dynamic properties of the powders change from particle-dominated to agglomeration-dominated as the particle size *** conclusion is supported by the results of field emission scanning electron microscopy.

关键词： Micro-nano powders Flow properties Compressibility Frictional properties Pressure distribution

Structural relaxation and avalanche dynamics of particle piles under vertical vibration

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Particuology 2022年第9期20卷 65-74页

作者： Lizhuo Zhu Haifeng Lu Xiaolei Guo Haifeng Liu shanghai engineering research center of coal Gasifiication East China University of Science and TechnologyShanghai 200237China

Granular matter can exhibit solid or liquid behavior,which contains complex physical *** this work,we experimentally investigated the structural relaxation and avalanche dynamics of particle piles under vertical *** influence of vibration parameters on the avalanche process was *** morphological features of avalanches were recorded and classified using high-speed *** effects of vibration parameters and particle properties on the relaxation mode are *** is found that the evolution of particle pile height with time can be described by an exponential decay *** relaxation rate and avalanche characteristics of four types of particles with different sizes are *** the same acceleration level,for two larger particles,a smaller amplitude(A=0.025 mm)leads to a faster relaxation rate,while for two smaller particles,a large amplitude(A=0.500 mm)leads to a faster relaxation *** analogy powder surface tension is introduced to address the cohesion and flowability evolution of particles under vibration.

关键词： Particle pile Vertical vibration Avalanche Flowability

In-situ study on structure evolution and gasification reactivity of biomass char with K and Ca catalysts at carbon dioxide atmosphere

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Carbon Resources Conversion 2023年第1期6卷 27-33页

作者： Xingjun Wang Qian Chen Huaili Zhu Xueli Chen Guangsuo Yu School of Resources and Environmental engineering East China University of Science and TechnologyShanghai 200237China shanghai engineering research center of coal gasification Shanghai 200237China

The structural evolution and gasification reactivity of biochar prepared from the pyrolysis of wheat straw were investigated by in-situ Raman spectroscopy and thermogravimetric *** Raman spectra consisted of a combination of four Lorentzian bands(D1,D2,D4,G)and one Gaussian band(D3)in the first-order *** experimental results showed that the addition of catalysts or the presence of ash could improve the CO_(2) gasification reactivity of biochar and result in a larger ID1/IG ratio and a lower IG/IALL ratio,meaning that the carbon structure was less ordered,and there were also more active sites such as amorphous carbon and cross-linked structures;Ca-based catalysts and K-based catalysts changed the evolution of biochar structure in a different way in CO_(2) atmosphere,the ID3/ID1 of Ca-based biochar was close to the value of non-catalyst biochar and decreased slowly,indicating that the Ca-based catalysts can stabilize the aromatic rings,while the IG/IALL of K-based biochar decreases significantly and the ID3/ID1 increased significantly,indicating the increase of carbon structure defects and the cracking of large aromatic rings in bio-char into small ones;a scheme of K and Ca reaction with biochar in CO_(2) gasification process was proposed.

关键词： In-situ Raman spectroscopy K and Ca catalysts gasification reactivity Structure evolution Biomass char

Characterization of the flowability dynamics of granular material flowing down a narrow channel

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Particuology 2020年第6期18卷 72-82页

作者： Ningsheng Wang Haifeng Lu Jianliang Xu Xiaolei Guo Haifeng Liu Key Laboratory of coal gasification and Energy Chemical engineering of Ministry of Education East China University of Science and TechnologyP.O.Box 272Shanghai 200237China shanghai engineering research center of coal gasification East China University of Science and TechnologyP.O.Box 272Shanghai 200237China Ningbo Ruiling Institute for Energy and Environment Solutions Ningbo 315500China

The flowability of granular material is commonly determined from shear cell tests,but in the real world,the granular flow is quite different in many *** this paper,the flowabilities in a narrow channel of five different granular materials were *** flow parameters of the granular flows were determined to classify the flowabil让*** flow surface velocities and flow heights and thicknesses were measured,and it was found that the mean shear rates in the linear portions of the velocity profiles in crease with both flow rates and incli nation.A universal parameter,the ratio of the sine of the inclin ation to the shear rate in the linear part of the velocity profile,is proposed as a *** constant is independent of particle *** addition,a flowability parameter,the ratio of the mean shear rate to the cosine of the inclination,is proposed to characterize the friction between the particles in the flowing granular material.

关键词： Dynamic characterization Granular flow Velocity profile Flowability Channel