Numerical Simulations of Staged Biomass Grate Fired Combustion with an Emphasis on NOx Emissions

Bugge, Mette; Skreiberg, Øyvind; Haugen, Nils Erland L.; Carlsson, Per; Houshfar, Ehsan; Løvås, Terese

doi:10.1016/j.egypro.2015.07.272

Cited by 30 publications

(17 citation statements)

References 7 publications

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“…This reduction of a detailed mechanism to a skeletal mechanism can be a very efficient approach to reduce complexity and computational cost of a model, but still obtain a high enough accuracy when it comes to model predictions. Bugge et al [13,130] compared a detailed reaction mechanism including 81 species and 1401 reactions with more simplified skeletal mechanisms, developed by Løvås et al [131], with only 49 species and 36 species. The detailed mechanism fully describes the interaction between nitrogen species and hydrocarbons.…”

Section: No X Formationmentioning

confidence: 99%

“…With respect to furnace modeling, primarily small-scale heating appliances , soot formation has only been considered very limitedly in current models. Bugge et al [13,130,132] used the Moss and Brookes soot model [150], in which the primary precursors for soot formation are acetylene and ethylene. Brookes and Moss [150] focused on jet diffusion flames burning methane at elevated or atmospheric pressure.…”

Section: Theory Of Soot Formation and Its Modelingmentioning

confidence: 99%

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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: No X Formationmentioning

confidence: 99%

Section: Theory Of Soot Formation and Its Modelingmentioning

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…The overall reaction rate for each reaction is calculated based on the eddy dissipation concept (EDC), which has also been widely used by other researchers in biomass combustion simulation [36][37][38].…”

Section: Gas Phasementioning

confidence: 99%

true normalC {normalH}_{4} + 2 {normalO}_{2} \to normalC {normalO}_{2} + 2 {normalH}_{2} normalO

true normalCO + \frac{1}{2} {normalO}_{2} \to normalC {normalO}_{2}

true {normalH}_{2} + \frac{1}{2} {normalO}_{2} \to {normalH}_{2} normalO

true normalCO + {normalH}_{2} normalO ⇌ {normalH}_{2} + normalC {normalO}_{2}

…”

Section: Mathematical Modelingmentioning

confidence: 99%

Effect of Turbulence of the Freeboard on Fluidized‐Bed Biomass Combustion

2020

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bed combustion is a very popular technology used to convert solid biomass into thermal energy, which has many advantages over other conversion technologies. However, these advantages strongly depend on the freeboard combustion. This study focuses on the effect of turbulence of the freeboard via developing a comprehensive mathematical model including four-way coupling, biomass thermal decomposition, and turbulent combustion by means of an Eulerian-Lagrangian framework. The validated model predicts with significant accuracy for all gas species when turbulence modeling is improved. The optimum amount of the secondary air ratio and the optimum excess air ratio were determined, which give a higher freeboard temperature while maintaining minimum emission.

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“…This allows you to judge the reliability of the obtained results and the applicability of physical, mathematical and numerical models to further study the thermal and concentration characteristics of combustion chamber BKZ 420 Almaty TPP-2 [12]. For more references, see [13] - [21]. Figure 10 shows the distribution of average values of concentrations of carbon monoxide CO at the height of the furnace for two different values of the mass flow of additional air through the holes located on the opposite burner wall.…”

Section: Experimental Partmentioning

confidence: 99%

Combustion processes in furnace chambers of Kazakhstan TPPs using high-ash coal

Аскарова

Maximov

Nugymanova

et al. 2017

Int. j. math. phys.

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In this article, carried out computational experiments to study the aerodynamic, thermal and concentration characteristics in combustion chamber of the boiler BKZ-420 Almaty TPP-2. Combustion chamber BKZ-420 has a significant drawback, which is that of a jet of hot air hitting the wall that is opposite the burners. This leads to her firing and a further violation of integrity. On the Almaty CHP-2 in the basic mode using this wall served cold the air mass flow 5 kg/s. In this paper, we proposed a new flow mode, which allows you to protect the wall from overheating, to reduce the temperature of the incoming flow more cold air. Carried out researches have allowed to conclude that the proposed regime provides not only protection against overheating of the boiler walls, but also reduces the concentration of harmful emissions. As a result of computer experiments were obtained fields of velocity, temperature, concentrations of harmful dust and gas emissions (CO, CO2, NO2) formed in combustion of solid fuels for different layout options holes and speed boost-extra air (5kg/s and 10 kg/s).

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Numerical Simulations of Staged Biomass Grate Fired Combustion with an Emphasis on NOx Emissions

Cited by 30 publications

References 7 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

Effect of Turbulence of the Freeboard on Fluidized‐Bed Biomass Combustion

Combustion processes in furnace chambers of Kazakhstan TPPs using high-ash coal

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