Three-dimensional CFD simulation of a large-scale grate-fired biomass furnace

Bermúdez, Cesar Álvarez; Porteiro, Jacobo; Varela, Luis G.; Chapela, Sergio; Patiño, David

doi:10.1016/j.fuproc.2019.106219

Cited by 43 publications

(21 citation statements)

References 58 publications

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“…al. [13] simulations of the distribution of C6H6, CH4, CO and H2 fractions in the midplane of the furnace showed that the largest changes in emissions occur right next to the fuel bed. For this reason, primary emission reduction measures must focus specifically on the processes taking place in this area.…”

Section: Resultsmentioning

confidence: 99%

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Grate-Firing Boilers Grate Movement Impact onto NOx, SO2 Emissions

Jančauskas

Buinevičius

2020

mech

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Measurements of pollutant concentrations in the flue gases of a biofuel boiler show that pollutants concentrations fluctuate by 10-100% and more at short time intervals. Large fluctuations in concentrations hinder the effective application of pollution reduction measures. During the research, flue gas composition measurements were performed in 4 MW, 8 MW industrial biofuel boilers and 20 kW experimental model. The results of the research showed that the change of CO, NO, NO2, SO2, H2S, O2 and particulate matter concentrations is related to the periodicity of the boiler grate movement. During the movement of the grate, the surface of the fuel bed is mechanically disrupted. The different composition of the fuel layers is mixed and this affects the changes in the concentration of combustion products. The clarity of the concentration fluctuations depends on the emissions, the type of fuel and the combustion parameters.

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Section: Resultsmentioning

confidence: 99%

“…The fuel bed of the reciprocating grate is characterized by stratification of the char and ash content with respect to the grate surface [13,14]. As the grate moves forward, the certain fuel bed areas are pushed.…”

Section: Resultsmentioning

confidence: 99%

Grate-Firing Boilers Grate Movement Impact onto NOx, SO2 Emissions

Jančauskas

Buinevičius

2020

mech

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“…Mass, momentum, energy, turbulence and species transport conservation equations are solved to achieve a solution [16]. The standard k-ε model was used to simulate the turbulent process in the furnace [17].…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Numerical simulation of co-incineration of sewage sludge and municipal solid waste in municipal solid waste incinerator

Wang

Liao

et al. 2020

E3S Web Conf.

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Incineration is widely used as an important method of sludge and garbage utilization and harmless treatment. The simulations of co-incineration of sludge and municipal solid waste are conducted by computational fluid dynamics method(CFD) in a MSW incinerator. The study focuses on the effect of mixing proportion, moisture content of sludge, excess air coefficient and primary and secondary air distribution ratio on the combustion progress. Simulation results indicate that the combustion temperature of furnace decreases rapidly with the increase of the mixing proportion and moisture content of sludge, which is mainly because the moisture content of sludge is higher than that of MSW as well as its low calorific value. As a result, it is recommended that the water content and mixing ratio of sludge would be controlled below 40% and 7% respectively. Therefore, the fresh sludge should be dried before entering the furnace.

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“…Eulerian models have a lower computational cost than Lagrangian models, being a more comprehensive approach than one-dimensional models [23]. These models usually consider two zones, the bed, defined as a porous zone where the solid and gas phases coexist, and the freeboard, set as a simple fluid, allowing dynamic coupling between both phases [25][26][27][28][29]. Eulerian models have been successfully used to simulate systems under different air/oxy-fuel conditions [28] and on different scales, from small experimental plants [27], to medium- [25] and large-scale systems [26,29].…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of an Internally Cooled Biomass Fixed-Bed Combustion Plant

et al. 2021

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The reduction of bed temperature in fixed-bed biomass combustion is an effective measure to lower pollutant emissions. Air staging and bed cooling solutions are active strategies to decrease the fuel bed temperature. This work presents a CFD study of a biomass fixed-bed combustion plant that is equipped with an internal cooling bed system. Eight different cases are calculated to analyze the effect of the total airflow, air staging ratios and bed cooling system on biomass combustion. The findings are validated against experimental data from the literature. The results show good accordance between the numerical results and the experimental data. The primary airflow rate has the biggest influence on the bed’s maximum temperatures. The internal bed cooling system is able to achieve an average bed temperature reduction of 21%, slowing the biomass thermal conversion processes. Bed cooling techniques can be combined with air staging and primary airflow reduction to reduce bed temperatures in order to reduce pollutant emissions and other undesirable phenomena, such as fouling or slagging.

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Three-dimensional CFD simulation of a large-scale grate-fired biomass furnace

Cited by 43 publications

References 58 publications

Grate-Firing Boilers Grate Movement Impact onto NOx, SO2 Emissions

Grate-Firing Boilers Grate Movement Impact onto NOx, SO2 Emissions

Numerical simulation of co-incineration of sewage sludge and municipal solid waste in municipal solid waste incinerator

CFD Simulation of an Internally Cooled Biomass Fixed-Bed Combustion Plant

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