Numerical simulation of biomass gasification process and distribution mode in two-stage entrained flow gasifier
| Autor: | Lijun Wang, Xiaocheng Du, Lingfeng Xu, Jiajun Sun |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
060102 archaeology Wood gas generator Renewable Energy Sustainability and the Environment Turbulence business.industry 020209 energy Flow (psychology) 06 humanities and the arts 02 engineering and technology Computational fluid dynamics Chemical reaction Adiabatic flame temperature Heat transfer 0202 electrical engineering electronic engineering information engineering 0601 history and archaeology Process engineering business Syngas |
| Zdroj: | Renewable Energy. 162:1065-1075 |
| ISSN: | 0960-1481 |
| Popis: | A 3D computational hydrodynamics model (CFD) of a two-stage entrained-flow biomass gasifier is developed for further engineering application of the clean utilization of renewable energy. The biomass gasification procedure in the entrained-flow gasifier is simulated with the CFD software FLUENT®15.0. The Eulerian-Lagrangian method is applied to model the two-phase chemical reaction and heat transfer flow. Based on the multi-step chemical reaction dynamics, the homogeneous and heterogeneous biomass gasification reaction are described, respectively. The realizable k-e model describes the turbulent flow of gas phase, and the motion of pulverized-biomass particles is tracked by the stochastic tracking method (STM). Using steam-air as gasification agent, different reaction mechanisms are simulated to compare with the verification value to find the optimal reaction mechanism. Then the quantitative influence of the main parameters of biomass gasification, namely, different equivalent ratios (ER), steam-to-biomass mass ratios (S/B), and the distribution ratios between the upper and lower stages (DR) are studied with the orthogonal analysis method. The results show that the proper values of ER, S/B and DR are helpful to improve gasification performances, such as maximum flame temperature, syngas compositions, active components, carbon conversion rates, etc. The optimum parameters for gasification condition are found as S/B = 0.1, ER = 0.16, DR = 30%/70%. |
| Databáze: | OpenAIRE |
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