Numerical analysis on the transport properties and residence time distribution of ribbon biomass particles in a riser reactor based on CFD-DEM approach--颗粒学报PARTICUOLOGY

Zhao, H., Gu, C., Xu, B., Liu, Y., Du, M., Deng, K., . . . Yuan, Z. (2024). Numerical analysis on the transport properties and residence time distribution of ribbon biomass particles in a riser reactor based on CFD-DEM approach. Particuology, 87, 133-146. https://doi.org/10.1016/j.partic.2023.08.004

Numerical analysis on the transport properties and residence time distribution of ribbon biomass particles in a riser reactor based on CFD-DEM approach

Haichao Zhao ^a, Conghui Gu ^a *, Bingyang Xu ^b, Yuan Liu ^a, Mingpu Du ^a, Kaiyuan Deng ^a, Jingyu Zhu ^a, Iana Voronina ^{a c}, Zhulin Yuan ^d

a School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, 212100, China
b China Tobacco Jiangxi Industrial Co. Ltd., Nanchang, 330096, China
c Institute of Mechanics and Power Engineering, Ogarev Mordovia State University, Saransk, 430005, Russia
d Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China

10.1016/j.partic.2023.08.004

Volume 87, April 2024, Pages 133-146

Received 19 March 2023, Revised 15 July 2023, Accepted 7 August 2023, Available online 25 August 2023, Version of Record 1 September 2023.

E-mail: guconghuigch@163.com

Highlights

• A novel flexible particle can accurately simulate the ribbon particle.

• The residence time of ribbon particles is numerically studied.

• Weaker back-mixing is due to particle length over 12 mm.

• Flow pattern is closer to plug flow if gas to material mass ratio is above 9.

Abstract

A bended ribbon biomass particle model was developed to explore the dynamic transport properties inside a riser reactor. Residence time distribution (RTD) of the particles was analyzed by using the Eulerian-Lagrange method. The effects of sampling height, particle density, particle size and gas-to-solid mass ratio on RTD were investigated. The coupled Computational Fluid Dynamics and Discrete Element Method (CFD-DEM) model was verified firstly by experimental data on pressure drop and residence time distribution density function. The simulation results demonstrated that the ribbon biomass particles display a typical annular-core spatial distribution during transportation. The RTD of particles exhibit an approximate single-peaked normal distribution. The mean residence time (MRT) can reach up to 0.7 s when the particle density is 1200 kg/m³. Particle with higher density has longer mean residence time. The flow patterns are closer to plug flow if particle length over 12 mm. The particle flow pattern is not sensitive to changes in particle density and size, while the gas-to-material mass ratio has a significant impact on it.

Graphical abstract

Keywords

Riser; Gas-solids two-phase flow; Ribbon biomass particles; Residence time distribution; CFD-DEM

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