Engineering bed models for solid fuel conversion process in grate-fired boilers

Costa, Michela; Massarotti, Nicola; Indrizzi, V.; Rajh, Boštjan; Yin, Chungen; Samec, Niko

doi:10.1016/j.energy.2014.07.067

Cited by 31 publications

(14 citation statements)

References 22 publications

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“…Paper [91] concluded that, for studies in which the main focus lies in the analysis of the freeboard processes and combustion optimization in the freeboard region (e.g., secondary air system optimization), such simplified bed models can be used without substantial error. In fact, both the models give very close results in terms of global mass flow rate, average temperature and velocity of the producer gas, which may be implemented into the freeboard combustion CFD model, as grate inlet boundary conditions.…”

Section: Content Detailsmentioning

confidence: 99%

100% sustainable energy

Olabi

2014

Energy

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Section: Content Detailsmentioning

confidence: 99%

100% sustainable energy

Olabi

2014

Energy

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“…For example, the dense fuel bed is treated as a 0D system, in which the thermochemical processes are divided in two successive sections: drying and chemical conversion. Phenomenological laws are used to characterize the syngas release as a function of the main governing parameters (Costa et al, 2014). Modeling of the conversion of the dense bed in a grate-fired boiler can also be done by using an experience-or measurement-based conversion rates as a function of the position on the grate.…”

Section: Overall Modeling Strategymentioning

confidence: 99%

Coal and biomass cofiring

Yin¹

2019

New Trends in Coal Conversion

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Suspension-firing, fluidized bed combustion and grate-firing are the three main technologies used to co-fire coal and biomass for heat and power generation. Computational Fluid Dynamics (CFD) modeling is a powerful and cost-effective tool for problem-shooting, design and optimization and plays a vital role in the development of these co-firing technologies. This chapter focuses on CFD of coal and biomass co-firing. After a brief overview of the status of co-firing, the chapter presents in detail the basic modules in general co-firing CFD. Then, the specific or new modeling strategies and issues that are pertinent to each of co-firing technologies are elaborated. Finally, new modeling issues for coal and biomass co-firing under oxy-fuel conditions are presented, before concluding remarks on coal and biomass co-firing modeling are summarized.

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“…All the calculations were consistent with the apparent phenomenon. In engineering, the former was mainly applied to the layered combustion, and hence good ventilation should be ensured to make the fuel surface fully contacted with the fresh air [27,28], while the latter was often used in suspension combustion; despite the relatively static state between the fuel and air [29], the fuel still showed good burnout performance for the high molecule collision frequency.…”

Section: Comparison Of Combustion Kinetic Characteristics Between Woomentioning

confidence: 99%

Experimental Investigation of Combustion Kinetics of Wood Powder and Pellet

Peng

et al. 2018

Journal of Combustion

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The combustion kinetic characteristics of wood powder and pellet were investigated within thermogravimetric analyser (TGA) and tube furnace system. The kinetic parameters of these two different forms of woody fuel were measured and derived by double-step-and-double-equal and isothermal method, respectively. The results showed that the combustion mechanisms of wood powder kept consistent through the whole process, while the combustion mechanisms of wood pellet differed significantly between the volatile and char combustion stages. The most probable mechanism functions of the two different forms of woody fuel were not the same due to the differences in internal heat and mass transfer properties. In addition, activation energy values varied from 92.33 kJ·mol−1 for wood powder to 71.20 kJ·mol−1 for wood pellet, while the preexponential factor value of wood powder (2.55×108 s−1) was far greater than the one of the wood pellet (78.55 s−1) by seven orders of magnitude.

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Engineering bed models for solid fuel conversion process in grate-fired boilers

Cited by 31 publications

References 22 publications

100% sustainable energy

100% sustainable energy

Coal and biomass cofiring

Experimental Investigation of Combustion Kinetics of Wood Powder and Pellet

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