Model simplifications on biomass particle combustion

Sousa, Nelson; Azevedo, J. L. T.

doi:10.1016/j.fuel.2016.03.106

Cited by 20 publications

(4 citation statements)

References 24 publications

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“…Em uma usina de energia, por exemplo, os pellets de biomassa são utilizados sob a forma de pequenas partículas, o que permite seu uso como carvão. 12,13 A biotransformação dos resíduos agrícolas em açúcares fermentescíveis com posterior produção de etanol de segunda geração é economicamente viável. Entretanto, as tecnologias empregadas para bioconversão da biomassa lignocelulósica, através dos resíduos agroindustriais ainda não são totalmente eficientes para produção de etanol em escala industrial, haja vista os custos com capital e operacionais.…”

Section: Introductionunclassified

HIDRÓLISE ENZIMÁTICA, FERMENTAÇÃO E PRODUÇÃO DE BIOCOMBUSTÍVEIS ATRAVÉS DA COROA DE Ananas comosus

Silva¹,

Malta²,

Rocha³

et al. 2018

Quim. Nova

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Problems related to the use of fossil fuels and greenhouse gas emissions have become global concerns. To address this issue, the strategy adopted in the present study was to use Ananas comosus residues as a source of fermentable carbohydrates to produce second generation ethanol and briquettes. The demand for biofuel is addressed in the present study by the integrated processing of several stages of treatment of the lignocellulosic substrate: chemical characterization, pretreatment, enzymatic hydrolysis and fermentation. It was verified under the conditions used that the enzymatic hydrolysis liberated after 72 hours 58.44 and 21.91 g L-1 of glucose and xylose, respectively. Conversion of the sugars in the fermentation step resulted in 18.80 g L-1 ethanol in 24 hours. The briquettes produced from the remaining solid fraction of the enzymatic hydrolysis presented a calorific value of 18.41 kJ kg-1 .

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Section: Introductionunclassified

HIDRÓLISE ENZIMÁTICA, FERMENTAÇÃO E PRODUÇÃO DE BIOCOMBUSTÍVEIS ATRAVÉS DA COROA DE Ananas comosus

Silva¹,

Malta²,

Rocha³

et al. 2018

Quim. Nova

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“…Although the biomass furnace bed is a solid–gas-phase reacting zone, the homogeneous bed model presumes the biomass packed bed to be a single phase, so that air and solid particles’ thermal properties are aggregated into one equation; in other words, the two phases are assumed to have equal temperatures. The chemical reaction mechanism dominates the conversion in this method, and the results of the single biomass particle model extend to the whole bed. ,,,,,− In the course of the bed modeling of the grate bed combustors, this method would not provide precise outcomes, as in reality the particles inside the bed have different boundary conditions, while this model can perform much better for fluidized bed modeling.…”

Section: Modeling and Cfd Simulationmentioning

confidence: 99%

A Review of Numerical Modeling and Experimental Analysis of Combustion in Moving Grate Biomass Combustors

2019

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This Review covers the current state-of-the-art literature dealing with numerical modeling and experimental analysis of moving grate biomass combustors. The greatest attention is paid to the modeling of the thermochemical conversion in the fuel bed. Changes in the fuel characteristics are also tracked during the combustion. Such a review can facilitate understanding a more robust model from viewpoints of thermal performance, chemical and physical properties, pollutant emissions, and combustion stability. Different modeling approaches for the moving grate biomass furnaces are introduced, with a focus on the independent fuel bed modeling. Stepwise biomass fuel degradation inside the bed and corresponding individual mathematical models are described, followed by overbed combustion modeling. Numerical methods for the conservation equations of the combustion model are classified, and a general iterative solution algorithm is delivered. Various NO x formation mechanisms from the fuel-bed efflux and the combustion of hot zone gases are detailed, followed by the particle matter originating from inorganic materials. Air-staging, the flue gas recirculation mechanism, and restriction of the maximum flame temperature can significantly reduce the NO x concentration in the flue gases. Industrial biomass combustion systems are addressed in terms of different grate technologies, and a general laboratory-scale biomass reactor is portrayed. For future work, according to the gaps found in the literature, it is recommended that, considering the intensive inhomogeneity of the biomass fuels, the effects of the fuel uncertainties should be considered in the bed modeling. Furthermore, deep investigation of the infrared images captured from biomass combustion can provide a comprehensive tool for the combustion system analysis. More recommendations are given in the conclusion of this Review.

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“…Liao [6] studied the characteristics of pollutants released from coal and biomass mixed combustion, and the research results showed that the alkaline minerals contained in biomass effectively inhibited the release of NO and SO2. Sousa et al [7,8] studied biomass particle mixed combustion models, and the research results showed that the commonly used particle mixed combustion models had shortcomings. They proposed to analyze the model index parameters required to simulate the conversion of single biomass particle, and pointed out that the mixed combustion models had more accurate requirements for the size of biomass particles.…”

Section: Introductionmentioning

confidence: 99%

Mixed Combustion Characteristics of Various Biomass Particles

Zhao¹,

Wei²

2023

JSE

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As a promising pollutant emission reduction technology, biomass mixed combustion has attracted widespread attention worldwide. This paper aimed to study the characteristics of biomass mixed combustion and temperature distribution. A combination of simulation and experimental methods was adopted. The results showed when four kinds of biomass were burned separately, their highest temperatures in the center section of combustion chamber were corn stalk>cotton stalk>sawdust>rice straw in descending order. Compared with other three biomass, the highest temperature of corn stalk was more than 100 K higher, which mainly occurred during the full combustion stage, mainly because corn stalk had high volatile content and caught fire easily. In addition, with the optimal mixed combustion parameters, biomass mixed combustion improved the combustion characteristics of single biomass combustion. The optimal blending ratio of corn stalk to rice straw was 7:3, and the optimal primary air velocity and temperature were 48 m/s and 1300 K, respectively. With the optimal blending ratio, the maximum temperature in the center section was higher than that of single biomass combustion, with advanced ignition point, relatively uniform temperature distribution in the combustion chamber and good combustion performance, because the precipitation and combustion of high volatile components during mixed combustion caused the surface temperature of fixed carbon to rise rapidly to reach the ignition temperature. Finally, this paper studied the combustion characteristics of corn stalk and rice straw with the optimal mixed combustion parameters in mixed combustion experiment, and verified the good consistency between the simulation and experimental values. Therefore, biomass mixed combustion technology provides an important reference for solving the problem of low calorific value of single biomass combustion.

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Model simplifications on biomass particle combustion

Cited by 20 publications

References 24 publications

HIDRÓLISE ENZIMÁTICA, FERMENTAÇÃO E PRODUÇÃO DE BIOCOMBUSTÍVEIS ATRAVÉS DA COROA DE Ananas comosus

HIDRÓLISE ENZIMÁTICA, FERMENTAÇÃO E PRODUÇÃO DE BIOCOMBUSTÍVEIS ATRAVÉS DA COROA DE Ananas comosus

A Review of Numerical Modeling and Experimental Analysis of Combustion in Moving Grate Biomass Combustors

Mixed Combustion Characteristics of Various Biomass Particles

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