Conversion of solid fuels and sorbents in fluidized bed combustion and gasification

Scala, Fabrizio; Solimene, Roberto; Montagnaro, Fabio

doi:10.1533/9780857098801.2.319

Cited by 6 publications

(6 citation statements)

References 281 publications

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“…The main (gaseous) products of the process are carbon dioxide and water (Nunes et al 2014). However, different types of fuels or incomplete combustion conditions may lead to noticeable production of other species of environmental relevance, such as CO, SO2, NOx, N2O, among others (Amaral et al, 2014;Nunes et al, 2014;Okasha et al, 2014;Scala et al, 2013;. Besides gaseous pollutant emissions, the combustion process also generates substantial particulate matter emissions.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of ash and particle emissions during bubbling fluidised bed combustion of three types of residual forest biomass

Ribeiro

Vicente

Alves

et al. 2016

Environ Sci Pollut Res

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Combustion of residual forest biomass (RFB) derived from eucalypt (Eucalyptus globulus), pine (Pinus pinaster) and golden wattle (Acacia longifolia) was evaluated in a pilot-scale bubbling fluidised bed reactor (BFBR). During the combustion experiments, monitoring of temperature, pressure and exhaust gas composition has been made. Ash samples were collected at several locations along the furnace and flue gas treatment devices (cyclone and bag filter) after each combustion experiment and were analysed for their unburnt carbon content and chemical composition. Total suspended particles (TSP) in the combustion flue gas were evaluated at the inlet and outlet of cyclone and baghouse filter and further analysed for organic and elemental carbon, carbonates and 57 chemical elements. High particulate matter collection efficiencies in the range of 94-99% were observed for the baghouse, while removal rates of only 1.4-17% were registered for the cyclone. Due to the sand bed, Si was the major element in bottom ashes. Fly ashes, in particular those from eucalypt combustion, were especially rich in CaO, followed by relevant amounts of SiO, MgO and KO. Ash characteristics varied among experiments, showing that their inorganic composition strongly depends on both the biomass composition and combustion conditions. Inorganic constituents accounted for TSP mass fractions up to 40 wt%. Elemental carbon, organic matter and carbonates contributed to TSP mass fractions in the ranges 0.58-44%, 0.79-78% and 0.01-1.7%, respectively.

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Section: Introductionmentioning

confidence: 99%

Characteristics of ash and particle emissions during bubbling fluidised bed combustion of three types of residual forest biomass

Ribeiro

Vicente

Alves

et al. 2016

Environ Sci Pollut Res

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“…137 Applying the kinetics of coal char in modeling the combustion of biomass is debatable, as biomass chars are more reactive than high-rank coal chars; the difference in the combustion rates reaches up to 5 orders of magnitude. 178 However, Al-Qayim et al 179 found that if biomass chars burn in Regime I (kinetic control), the resulting activation energy for intrinsic kinetics was close to the one given by Smith. When the rates of burning biomass chars were imposed on Smith's meta-Arrhenius plot, they overlapped closely with the results for more active, low-rank coal chars.…”

Section: Combustion Of Biomass: Phenomenamentioning

confidence: 75%

“…Because of the lack of similar studies gathering information on biomass chars, Kwong et al successfully applied Smith’s intrinsic kinetics when analyzing the combustion of birch char in a fluidized bed, in the presence of active bed materials that release O 2(g) in chemical looping oxygen uncoupling experiments . Applying the kinetics of coal char in modeling the combustion of biomass is debatable, as biomass chars are more reactive than high-rank coal chars; the difference in the combustion rates reaches up to 5 orders of magnitude . However, Al-Qayim et al found that if biomass chars burn in Regime I (kinetic control), the resulting activation energy for intrinsic kinetics was close to the one given by Smith.…”

Section: Combustion Of Biomass: Phenomenamentioning

confidence: 99%

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Kwong

Marek

2021

Energy Fuels

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This review presents recent advances in research on fluidized bed combustion of solid biomass. While the main focus is on thermochemical processes occurring in fluidized beds, applicable investigations on biomass combustion from other research areas are also described as they often provide fundamental insight about the processing of biomass, applicable also in the context of fluidized beds. This review aims to summarize lessons learned and indicate some remaining gaps in the existing body of knowledge. The review discusses combustion in separate stages, such as drying, pyrolysis, and homo-and heterogeneous combustion, and characterizes how fluidized beds affect combustion, discussing heat and mass transfer, material segregation, and bed agglomeration. Finally, advances in new research trends and the prospects for technology development are considered, highlighting the chemical-looping technology with its inherent potential for carbon capture, scale-up of advanced computational models, and progress in spectroscopic and tomographic studies applied to combustion.

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“…This latter reflects the relationship between the residence time in the FR and the net reactivity of the bed inventory. Insufficient gas–solid mixing can also arise as the biomass particles tend to float to the surface of the bed, thereby releasing a fraction of the volatiles in zones that have a low density of OCs. In addition, fuel particle characteristics have an important role to control, to a certain measure, the amount of unburnt volatiles: for small particles and high volatile contents, carbon slip to AR is almost negligible, but at the expense of lower volatiles conversion …”

Section: Effect Of Volatiles On Bio-clcmentioning

confidence: 99%

Chemical Looping for Combustion of Solid Biomass: A Review

Coppola¹,

Scala

2021

Energy Fuels

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Chemical looping combustion of solid biomass has the unique potential to generate energy with negative carbon emissions, while entailing an energy penalty compared to traditional combustion that is lower than that of the competing carbon capture technologies. In spite of these attractive features, research is still needed to bring the technology to a fully commercial level. The reason relies on a number of technological challenges mostly related to the oxygen carrier performance, its possible detrimental interaction with the biomass ash components, and the efficiency of the gas–solid contact with the biomass volatiles. This review is focused on these specific challenges which are particularly relevant when firing biomass rather than coal in a solid-based chemical looping combustion process. Special attention will be given to the most recent findings published on these aspects. Related performance evaluation by modeling, system integration, and techno-economic analysis will also be briefly reviewed.

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Conversion of solid fuels and sorbents in fluidized bed combustion and gasification

Cited by 6 publications

References 281 publications

Characteristics of ash and particle emissions during bubbling fluidised bed combustion of three types of residual forest biomass

Characteristics of ash and particle emissions during bubbling fluidised bed combustion of three types of residual forest biomass

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Chemical Looping for Combustion of Solid Biomass: A Review

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