Effect of turbulent fluctuation on the ignition of millimeter particle:Experimental studies and numerical modelling with a new correlation of nusselt number

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外文摘要：Understanding the influencing mechanism of turbulent fluctuation on the ignition characteristics of millimeter coal particles is essential.In this work,to study the effect of turbulent fluctuation on ignition time,millimeter coal particles are subjected to a specific flow field,generated in a furnace with sym-metric fans.A one-dimensional model with the new proposed correlation and the Ranz-Marshall(R-M)correlation for Nu(Nusselt number)is established to simulate the coal ignition process.In addition,the effects of fan speed,temperature,particle diameter,particle distance and coal type on the ignition time are investigated.It is found that an increase in fan speed from 0 to 3000 rpm leads to a particle Reynolds number Rep increase from 0 to 22.5,and a turbulent particle Reynolds number Ret*increase from 0 to 71.5.With a consideration of the fluctuation effect,the new correlation of Nu gives a better prediction of ignition time compared to the R-M correlation.Moreover,the ignition time is revealed to decrease with an increasing fan speed and an elevating temperature.While the ignition time shows merely an initial boost with enlarging particle distance,it exhibits a linearity with the term of particle diameter dp1.3-1.7 and Reynolds numbers(Nu*/Nu)-0.6(Nu*is turbulent Nusselt number).Based on this relationship,the difference of predicted ignition time is calculated at different Rep and Ret*.It is shown that at low Rep or high Ret*values,the new correlation should substitute for the R-M correlation.

外文关键词：

Turbulent fluctuationParticle heat transferEmpirical correlationCoal ignition

作者：

Lele Feng、Jie Liu、Haihui Xin、Liangliang Jiang、Yuxin Wu、Saeideh Babaee

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作者单位：

Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization,China University of Mining and Technology,Xuzhou,221008,China

School of Safety Engineering,China University of Mining and Technology,Xuzhou,221116,China

Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials,Wuhan University of Science and Technology,Wuhan,430000,China

Department of Chemical and Petroleum Engineering,University of Calgary,Calgary,Alberta,Canada

Department of Energy and Power Engineering,Tsinghua University,Beijing,100084,China

Department of Chemical and Metallurgical Engineering,University of the Witwatersrand,Johannesburg,South Africa

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShuangchuang Doctor Project of Jiangsu ProvinceKey Laboratory of Hubei Province for Coal Conversion and New Carbon Materials,Wuhan University of Science and Technology"Double First Class"Construction Project to Enhance Independent Innovation Ability of China University of Mining & Technology

项目编号：

5210618952174220202131196WKDM2023022022ZZCX03K06

出版年：

2024

DOI：

10.1016/j.partic.2024.03.002

颗粒学报(英文版)

中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD

影响因子：0.632

ISSN：1674-2001

年,卷(期)：2024.91(8)