CFD based combustion model for sewage sludge gasification in a fluidized bed

doi:10.1007/s11705-009-0050-7

Front Chem Eng Chin

2009, Vol. 3

Issue (2) : 138-145 https://doi.org/10.1007/s11705-009-0050-7

RESEARCH ARTICLE

CFD based combustion model for sewage sludge gasification in a fluidized bed

Yiqun WANG, Lifeng YAN(

)

Hefei National Laboratory for Physcial Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China

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Abstract

Gasification is one potential way to use sewage sludge as renewable energy and solve the environmental problems caused by the huge amount of sewage sludge. In this paper, a three-dimensional Computational Fluid Dynamics (CFD) model has been developed to simulate the sewage sludge gasification process in a fluidized bed. The model describes the complex physical and chemical phenomena in the gasifier including turbulent flow, heat and mass transfer, and chemical reactions. The model is based on the Eulerian-Lagrangian concept using the non-premixed combustion modeling approach. In terms of the CFD software FLUENT, which represents a powerful tool for gasifier analysis, the simulations provide detailed information on the gas products and temperature distribution in the gasifier. The model sensitivity is analyzed by performing the model in a laboratory-scale fluidized bed in the literature, and the model validation is carried out by comparing with experimental data from the literature. Results show that reasonably good agreement was achieved. Effects of temperature and Equivalence Ratio (ER) on the quality of product syngas (H₂ + CO) are also studied.

Keywords CFD model sewage sludge gasification syngas

Corresponding Author(s): YAN Lifeng,Email:lfyan@ustc.edu.cn

Issue Date: 05 June 2009

Cite this article:

Yiqun WANG,Lifeng YAN. CFD based combustion model for sewage sludge gasification in a fluidized bed[J]. Front Chem Eng Chin, 2009, 3(2): 138-145.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0050-7
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I2/138

Fig.1 Gasifier geometry and meshes

Tab.1 Proximate and ultimate analyses of dried sewage sludge

Fig.2 Temperature distribution in the gasifier. (a) Temperature contours; (b) axial temperature profiles. “P1” means P1 radiation model, “Radiation off” means without consideration of radiation heat transfer

Fig.3 Axial profiles of product mole fraction at ER= 0.25 and = 1073 K

Fig.4 Axial profiles of product mole fraction under different temperature conditions at ER= 0.25. (a) CO; (b) CO

Fig.5 Axial profiles of product mole fraction for different values of ER at = 1073 K. (a) CO; (b) CO

Fig.6 Effect of ER on volume fraction of H + CO for = 1023 K, 1073 K, and 1123 K. (M) Model results; (E) experiment data

Fig.7 Effect of temperature on volume fraction of H + CO for ER= 0.25, 0.30, and 0.35. (M) Model results; (E) experiment data

Fig.8 Effect of ER on ratio of H/CO for = 1023 K, 1073 K, and 1123 K. (M) Model results; (E) experiment data

Fig.9 Effect of temperature on the ratio of H/CO for ER= 0.25, 0.30, and 0.35. (M) Model results; (E) Experiment data

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