Eulerian–Lagrangian Simulation of Biomass Gasification Behavior in a High-Temperature Entrained-Flow Reactor

Ku, Xiaoke; Li, Tian; Løvås, Terese

doi:10.1021/ef5010557

Cited by 90 publications

(84 citation statements)

References 27 publications

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“…Moreover, the predictive performance and accuracy of the integrated model have been demonstrated by validating its results against a broad range of experimental data of Qin et al, 8 as reported in our earlier publication. 12 2.2.2. CRD Model.…”

Section: Mathematical Modelingmentioning

confidence: 99%

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Effects of Particle Shrinkage and Devolatilization Models on High-Temperature Biomass Pyrolysis and Gasification

Løvås

2015

Energy Fuels

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The effects of two different particle shrinkage and devolatilization models on biomass pyrolysis and gasification behavior in a high-temperature (1400°C) entrained-flow reactor have been studied employing a three-dimensional Eulerian− Lagrangian computational fluid dynamic model in the framework of open-source codes, OpenFOAM. Both qualitative results (temperature distribution, gas composition, and particle distribution) and quantitative results (pyrolysis time, syngas production, carbon conversion, and particle residence time) are presented and analyzed. Results show that particle shrinkage models significantly affect the simulation results and the constant volume model predicts a faster devolatilization rate, higher H 2 , CO, and CH 4 productions, lower CO 2 production, higher carbon conversion, and longer particle residence time than the constant density model. However, the two devolatilization models employed give consistent results on the exit syngas production and carbon conversion, although the constant rate devolatilization model predicts a faster devolatilization rate and a longer particle residence time than the single kinetic rate devolatilization model. In addition, the sensitivity of the kinetic constants for the constant rate devolatilization model is also tested. These trends are the same for both the biomass pyrolysis and gasification applications. Moreover, the predicted results are also compared to the experimental data available in the literature, and the differences resulting from different particle shrinkage and devolatilization models are highlighted.

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Section: Mathematical Modelingmentioning

confidence: 99%

“…A gridsensitivity study of this setup has been carried out and reported in our previous paper. 12 The fuel used in the simulations is beech wood. Its properties are configured identically to the fuel used in the experiments at DTU, and its characteristics are summarized in Table 1.…”

Section: Simulation Setupmentioning

confidence: 99%

Effects of Particle Shrinkage and Devolatilization Models on High-Temperature Biomass Pyrolysis and Gasification

Løvås

2015

Energy Fuels

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“…In parallel, gasification models using equilibrium model [12] or CFD calculations [14] have been developed and tested. These models, which include simple reaction schemes, generally allow predicting the syngas composition with a good accuracy for the main gases (CO, H 2 , CO 2 , CH 4 , H 2 O) but are unable to predict tar and soot production.…”

Section: Introductionmentioning

confidence: 99%

Influence of H 2 O, CO 2 and O 2 addition on biomass gasification in entrained flow reactor conditions: Experiments and modelling

Billaud

Valin

Peyrot

et al. 2016

Fuel

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. Influence of H2O, CO2 and O-2 addition on biomass gasification in entrained flow reactor conditions: Experiments and modelling. Fuel, Elsevier, 2016, 166, pp.166-178. 10 Experiments were modelled with a 1D-model using detailed chemical scheme. Gas, char, tar + soot were satisfactorily simulated in the whole range of conditions. ysis reaction, gas phase reaction with a detailed chemical scheme (176 species, 5988 reactions), char gasification by steam and CO 2 and soot formation. H 2 O or CO addition has no influence on gasification product yields at 800 and 1000 °C, while at 1200 and 1400 °C the char gasification is significantly enhanced and soot formation is certainly inhibited by OH radical which reacts with soot precursors. The modification of output gas phase composition is mostly due to WGS reaction which reaches thermodynamic equilibrium from about 1200 °C. As expected, O 2 has a significant influence on gas and tar yields through combustion reactions. Char and soot yields decrease as ER increases. The GASPAR model allows a good prediction of gas and char and gives relevant evolution of soot and tar yields on the large majority of conditions studied.

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“…The interphase interactions are considered as source terms in Navier‐Stokes equations. Most researchers have used the Eulerian‐Lagrangian approach in their CFD gasification models such as Ku et al, Gao et al, and Chen et al…”

Section: Model Description and Assumptionsmentioning

confidence: 99%

“…However, CFD simulations may be best used to predict the trends in the process of gasification rather than to calculate the specific values of the parameters . Ku et al performed a parametric analysis and evaluated the produced species concentration and carbon conversion using CFD simulation. They found that increasing the gasifier temperature has a positive effect on the gasifier performance while increasing the excess air ratio reduces the amount of generated syngas.…”

Section: Introductionmentioning

confidence: 99%

Development of a high‐temperature two‐stage entrained flow gasifier model for the process of biomass gasification and syngas formation

2019

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Summary This paper presents development of the Mitsubishi Heavy Industries (MHI) gasifier utilizing an analogy between a model with coal feedstock and the model with torrefied woody biomass. A computational fluid dynamics (CFD) model was primarily developed for coal gasification, and the simulation results were validated with similar published work and experimental measurements. The model was extended for the woody biomass to predict the gasifier performance under the gasification process. The results were used to compare the effect of fuel type on the gasifier performance and gaseous product compositions. The second‐level injection nozzles were modified tangentially, and the flow characteristics, species yields, and temperature were evaluated. The possibility of reducing the gasifier length from 13 to 8 m is also evaluated for different total length. The results revealed that using woody biomass leads to a decrease in the mole fraction of CO and H2 at the gasifier outlet compared with coal. An opposite trend was observed for CO2 and CH4 compositions. The contributions of modified second‐level nozzles to the total gas composition and exit temperature only account for less than 3%. Reducing the gasifier length from 13 to 8 m increased the exit temperature from 1289 to 1340 K, but the changes in the exit gas composition were less than 2%. The new design of the MHI gasifier can reduce the investment costs by reducing the gasifier length as well as using biomass instead of coal.

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Eulerian–Lagrangian Simulation of Biomass Gasification Behavior in a High-Temperature Entrained-Flow Reactor

Cited by 90 publications

References 27 publications

Effects of Particle Shrinkage and Devolatilization Models on High-Temperature Biomass Pyrolysis and Gasification

Effects of Particle Shrinkage and Devolatilization Models on High-Temperature Biomass Pyrolysis and Gasification

Influence of H 2 O, CO 2 and O 2 addition on biomass gasification in entrained flow reactor conditions: Experiments and modelling

Development of a high‐temperature two‐stage entrained flow gasifier model for the process of biomass gasification and syngas formation

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