3-D numerical simulation for co-firing of torrefied biomass in a pulverized-fired 1 MWth combustion chamber

Stroh, Alexander; Alobaid, Falah; Busch, Jan-Peter; Ströhle, Jochen; Epple, Bernd

doi:10.1016/j.energy.2015.03.078

Cited by 37 publications

(12 citation statements)

References 47 publications

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“…This is integrated into FLUENT through user-defined functions. The standard version of ESTOS is based on a five-step global reaction scheme for coal combustion: Coal pyrolysis, char oxidation, char gasification with CO 2 , combustion of hydrocarbons, and CO oxidation and has been validated comprehensively against measurements in lab-scale furnaces and full-scale boilers [43][44][45]. In the extended version of ESTOS, the two global gas-phase reactions are substituted by the detailed gas-phase kinetics mentioned above.…”

Section: Numerical Setupmentioning

confidence: 99%

Simulation Study of the Formation of Corrosive Gases in Coal Combustion in an Entrained Flow Reactor

et al. 2020

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Gaseous sulfur species play a major role in high temperature corrosion of pulverized coal fired furnaces. The prediction of sulfur species concentrations by 3D-Computational Fluid Dynamics (CFD) simulation allows the identification of furnace wall regions that are exposed to corrosive gases, so that countermeasures against corrosion can be applied. In the present work, a model for the release of sulfur and chlorine species during coal combustion is presented. The model is based on the mineral matter transformation of sulfur and chlorine bearing minerals under coal combustion conditions. The model is appended to a detailed reaction mechanism for gaseous sulfur and chlorine species and hydrocarbon related reactions, as well as a global three-step mechanism for coal devolatilization, char combustion, and char gasification. Experiments in an entrained flow were carried out to validate the developed model. Three-dimensional numerical simulations of an entrained flow reactor were performed by CFD using the developed model. Calculated concentrations of SO2, H2S, COS, and HCl showed good agreement with the measurements. Hence, the developed model can be regarded as a reliable method for the prediction of corrosive sulfur and chlorine species in coal fired furnaces. Further improvement is needed in the prediction of some minor trace species.

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Section: Numerical Setupmentioning

confidence: 99%

Simulation Study of the Formation of Corrosive Gases in Coal Combustion in an Entrained Flow Reactor

et al. 2020

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“…However, considering the lack of high-heating rate kinetic data, the TGA kinetics were deemed suitable enough to make a comparative analysis between untorrefied biomass, torrefied biomass and coal as long as the kinetics for all the cases were derived under similar TGA conditions. Previous studies have also utilised TGA kinetics in combustion modelling cases (Stroh et al 2015;Zhang et al 2013).…”

Section: Cfd Modelling Of J Curcas Seed Cake Co-firingmentioning

confidence: 99%

“…Biomass combustion/co-firing in itself has its share of issues, and so has its computational modelling. The thermochemical structure of biomass adds to the complexity of the model (Stroh et al 2015). Also, the size and shape of the particles potentially has a more significant effect in the modelling of biomass, as opposed to coal; this is a consequence of internal heat transfer within the particles (Gubba et al 2011;Gubba et al 2012).…”

Section: Introductionmentioning

confidence: 99%

An investigation into the use of CFD to model the co-firing ofJatropha curcasseed cake with coal

Madanayake

Gan

Eastwick

et al. 2018

International Journal of Green Energy

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Jatropha curcas seed cake is a potential candidate for co-firing with coal. Combustion modelling using Ansys Fluent 14.0 was carried out to assess the combustion and co-firing characteristics of untorrefied and torrefied Jatropha curcas seed cake. The effect of torrefaction on the devolatilisation characteristics, flame properties and consequently NOx pollutant formation was established. Compared to the torrefied biomass, the untorrefied seed cake devolatilised earlier, had a more dispersed flame and higher NO formation. The higher reactivity of the biomass was shown to have a positive effect on the devolatilisation rate of the less reactive coal under co-firing simulations.

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“…The use of thermally decomposed residual biomass waste in the form of an organic charcoal, referred to as biochar, is growing fast due to its applications as a soil amendment in agriculture, a precursor for production of activated carbon and graphene, a sorbent in sewage treatments and filtration plants, a fuel source for co‐firing with coal, and numerous other burgeoning uses. [ 1–3 ] Carbonization of biomass to biochar is a well‐known process that has been utilized by numerous human civilizations for thousands of years. In fact, the pyrolysis process is the thermal decomposition of an organic substance by heating it in the absence of oxygen and can be tailored and controlled through operating conditions (temperature, residence time, heating rate).…”

Section: Introductionmentioning

confidence: 99%

Analysis of premixed and non‐premixed co‐injection of volatile gas in an industrial indirect pyrolysis plant

Khodaei

Olson²,

Nikrityuk

2020

Can J Chem Eng

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Production of raw biochar from the pyrolysis of residual wood and biomass materials has recently been bolstered, in part, due to new indirect slow pyrolysis technologies such as continuous moving bed biochar reactors, rotary kiln reactors, and rotary auger systems. The self‐ignition of wood volatile gas blended with supplement fuel is achievable by adequate mixing of volatiles and stoichiometric air under standard combustion temperatures. In this study, two different CFD simulations were deployed to investigate co‐combustion of a non‐premixed swirl air/propane burner. In particular, one case with pre‐mixed air/pyrolysis gases and one case with non‐premixed air/pyrolysis gases were considered in this work. Pyrolysis gases were produced in an indirect industrial pyrolysis plant taking into consideration the contribution of major volatile components such as CH4, CO2, and CO, and two typical moisture contents predicted using the heat transfer analysis between the combustion chamber and the pyrolysis section. The finite rate model/eddy dissipation model coupled with the realizable k‐epsilon RANS model was used to render turbulence‐chemistry interactions. Validation against experimental data published in the literature and measured in the system demonstrated reasonable agreements. It was shown that the injection of premixed volatile gases and air with high temperature results in higher efficient combustion and better heat transfer rate between the combustion chamber and pyrolysis section rather than the alternative non‐premixed conditions. Due to safety considerations, utilizing a non‐premixed configuration in indirect biochar plant is advised, and further improvements through a pre‐heated excess air system and advanced swirl non‐premixed air/volatile injection nozzles is considered to mitigate the energy deficit in this configuration.

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3-D numerical simulation for co-firing of torrefied biomass in a pulverized-fired 1 MWth combustion chamber

Cited by 37 publications

References 47 publications

Simulation Study of the Formation of Corrosive Gases in Coal Combustion in an Entrained Flow Reactor

Simulation Study of the Formation of Corrosive Gases in Coal Combustion in an Entrained Flow Reactor

An investigation into the use of CFD to model the co-firing ofJatropha curcasseed cake with coal

Analysis of premixed and non‐premixed co‐injection of volatile gas in an industrial indirect pyrolysis plant

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