Advanced modelling and testing of a 13 MW th waste wood-fired grate boiler with recycled flue gas

Rajh, Boštjan; Yin, Chungen; Samec, Niko; Hriberšek, Matjaž; Zadravec, Matej

doi:10.1016/j.enconman.2016.02.036

Cited by 44 publications

(10 citation statements)

References 25 publications

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“…It was found that a major part of the bed models in large-scale grate furnaces is empirical [16,17,175,177,181,182,184,186]. This finding was confirmed by Yin et al [173], claiming that such experience-and measurement-based models are attractive due to their robustness.…”

Section: Approach Short Descriptionmentioning

confidence: 79%

“…Some empirical 1D bed models do, however, include a dynamic coupling between the bed and the gas phase [186]. The dynamic coupling is then done with the radiative heat flux emitted by the flame and the furnace walls, which heats up the fuel bed, as well as the mass flux of combustible gases from the fuel bed into the gas phase.…”

Section: Approach Short Descriptionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical models for thermochemical degradation of thermally thick woody biomass, and their application in domestic wood heating appliances and grate furnaces

Haberle

Skreiberg

Łazar

et al. 2017

Progress in Energy and Combustion Science

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This paper reviews the current state of the art of numerical models used for thermochemical degradation and combustion of thermally thick woody biomass particles. The focus is on the theory of drying, devolatilization and char conversion with respect to their implementation in numerical simulation tools. An introduction to wood chemistry, as well as the physical characteristics of wood, is also given in order to facilitate the discussion of simplifying assumptions in current models. Current research on single, densified or non-compressed, wood particle modeling is presented, and modeling approaches are compared. The different modeling approaches are categorized by the dimensionality of the model (1D, 2D or 3D), and the one-dimensional models are separated into mesh-based and interface-based models. Additionally, the applicability of the models for wood stoves is discussed, and an overview of the existing literature on numerical simulations of small-scale wood stoves and domestic boilers is given. Furthermore, current bed modeling approaches in large-scale grate furnaces are presented and compared against single particle models.

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Section: Approach Short Descriptionmentioning

confidence: 79%

Section: Approach Short Descriptionmentioning

confidence: 99%

Numerical models for thermochemical degradation of thermally thick woody biomass, and their application in domestic wood heating appliances and grate furnaces

Haberle

Skreiberg

Łazar

et al. 2017

Progress in Energy and Combustion Science

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show abstract

“…Then, an overall heat and mass balance of fuel components and primary air can be solved to obtain the lengthwise profiles of temperature, species and velocity on the top of the dense fuel bed along the grate. Such profiles are used as the grate inlet conditions for the freeboard CFD (Blasiak et al, 2006;Goerner and Klasen, 2006;Kim et al, 1996;Klason and Bai 2006;Rajh et al, 2016;Stubenberger et al, 2008;Weissinger et al, 2004;Yin et al, 2008bYin et al, , 2012.…”

Section: Overall Modeling Strategymentioning

confidence: 99%

Coal and biomass cofiring

Yin¹

2019

New Trends in Coal Conversion

Self Cite

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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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“…Mathematical modeling is a useful tool for the investigation of such thermal processes, as it can be used to study a given system without the need to run several experimental tests (Fournel et al, 2015). The models can be built by studying the system behavior through equations that describe the physical and chemical phenomena involved in the process, such as Computational Fluid Dynamics or transient models (Silveira et al, 2017;Rajh et al, 2016;Siqueira et al, 2012). Although these types of models can describe several phenomena, they require considerable detailed information about the system and computational resources.…”

Section: Introductionmentioning

confidence: 99%

The Role of Char Formation in Equilibrium Modeling of Gasification Processes

2020

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This work aims to develop and validate a model based on chemical equilibrium to predict the composition of syngas produced by gasification of woody biomass (sawdust). The model uses Gibbs Energy minimization to evaluate the composition of the system in chemical equilibrium. The results are validated by comparison between experimental data from a gasification experiment and those of other similar models in the literature. The study shows good agreement among experimental results and elucidates the role of solid unburned carbon in such systems, which is present in considerable amount. It can be concluded that equilibrium models can be used to predict carbon conversion in gasification systems.

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Advanced modelling and testing of a 13 MW th waste wood-fired grate boiler with recycled flue gas

Cited by 44 publications

References 25 publications

Numerical models for thermochemical degradation of thermally thick woody biomass, and their application in domestic wood heating appliances and grate furnaces

Numerical models for thermochemical degradation of thermally thick woody biomass, and their application in domestic wood heating appliances and grate furnaces

Coal and biomass cofiring

The Role of Char Formation in Equilibrium Modeling of Gasification Processes

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