Structural Design and Numerical Simulation for Furnace Arch in Straw-fired Boiler

Yu, Zhaosheng; Xiao, Qian; Liu, Guo Hui

doi:10.1007/978-3-540-76694-0_218

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…Ji et al used natural gas to simulate the volatiles released from coal and investigated the unsteady combustion mechanism of an industrial moving grate boiler under two typical air distribution modes [15]. Zhao et al conducted a numerical simulation study using FLIC + Fluent [16] software to analyze the combustion characteristics of straw direct-firing boilers at a specific load, only changing the ratio of primary and secondary air [17]. However, due to the difference in combustion characteristics between coal and biomass, there is limited research on air distribution modes in grate-firing boilers for biomass combustion.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Air Distribution in a Biomass Grate-Fired Furnace

Wang,

Zhang,

Xiao

et al. 2023

Energies

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This study utilized a combination of FLIC(1D3.2C) and FLUENT(2021R2) software to optimize the primary air distribution along the grate and the performance of a straw briquette combustion furnace of a 7 MW unit in China used to produce hot air for drying grain. Three air distribution modes, namely front-enhanced, uniform, and rear-enhanced modes, were analyzed to determine their effect on the flue gas components above the grate, the temperature field in the furnace, and the nitrogen oxide concentration at the furnace outlet. The results of the calculations showed that the NOx emissions for the front-enhanced, uniform, and rear-enhanced modes were 133.5 mg/Nm3, 104.4 mg/Nm3, and 76.6 mg/Nm3, respectively. It was found that the rear-enhanced mode can expand the biomass drying, devolatilization, and combustion zone, thus improving the furnace combustion performance and decreasing NOx emissions. These findings can provide useful guidance for optimizing biomass chain-grate-firing furnaces.

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Section: Introductionmentioning

confidence: 99%

Optimization of the Air Distribution in a Biomass Grate-Fired Furnace

Wang,

Zhang,

Xiao

et al. 2023

Energies

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Mathematical modeling of combustion in a grate-fired boiler burning straw and effect of operating conditions under air- and oxygen-enriched atmospheres

Liao

2010

Renewable Energy

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Adapting the Forchheimer equation for the flow of air through wheat straw beds

et al. 2016

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The paper presents the results of an experimental investigation of air pressure drop while flowing through wheat straw beds. According to Darcy?s law, the smaller the porosity of the bed is, the bigger the pressure drop will be. The investigation was conducted using three different porosities (or three bed densities), and for two different air flow rates. After determining porosity (which is directly measurable), the permeability of straw could be found. For high flow velocities, such as the velocity of air flowing through a straw bale, the Forchheimer equation becomes more relevant as a correction of Darcy?s law with inertial effects included. Otherwise, the permeability tensor depends only on the geometry of the porous medium. With permeability known, the Forchheimer equation coefficients can be easily estimated. These results may be important for the future development of efficient biomass combustion facilities. The measurement methods and facility characteristics are described in more detail.

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Structural Design and Numerical Simulation for Furnace Arch in Straw-fired Boiler

Cited by 3 publications

References 11 publications

Optimization of the Air Distribution in a Biomass Grate-Fired Furnace

Optimization of the Air Distribution in a Biomass Grate-Fired Furnace

Mathematical modeling of combustion in a grate-fired boiler burning straw and effect of operating conditions under air- and oxygen-enriched atmospheres

Adapting the Forchheimer equation for the flow of air through wheat straw beds

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