Comparison of oxygen enriched and oxy-combustion characteristics of lignite in a CFB: Modelling and experimental verification

Oxy-combustion and oxygen enriched combustion are considered as promising options for CO2 capture and storage. In the present study, numerical simulations of a 30 kWth circulating fluidized bed reactor were performed under oxygen enriched (O2/N2) and oxy-combustion (O2/Recycled Flue Gas) (RFG) condi...

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Bibliographic Details
Published in:Powder technology 2021-09, Vol.389, p.355-367
Main Authors: Raheem, Duygu Gündüz, Yılmaz, Barış, Özdoğan, Sibel
Format: Article
Language:English
Subjects:
Atmosphere
Carbon dioxide
Carbon dioxide emissions
Carbon sequestration
CFB
Combustion
Combustion chambers
CPFD
Emission measurements
Emissions
Flue gas
Fluidized bed reactors
Fluidized beds
Lignite
Mathematical models
Modelling
Oxy-combustion
Oxygen
Oxygen enriched
Oxygen enrichment
Temperature profiles
Validation
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Summary:Oxy-combustion and oxygen enriched combustion are considered as promising options for CO2 capture and storage. In the present study, numerical simulations of a 30 kWth circulating fluidized bed reactor were performed under oxygen enriched (O2/N2) and oxy-combustion (O2/Recycled Flue Gas) (RFG) conditions to investigate the effects of combustion atmospheres on the lignite combustion characteristics. The influence of oxygen concentration ranging from 21% to 28% on temperature and gaseous emissions were investigated by keeping excess oxygen ratio constant at 1.45 for both atmospheres. The predicted gas emissions and temperature profiles along the combustor were validated with conducted experiments. A good agreement between the simulated and measured data was achieved. CO2 emission was found more in O2/RFG combustion compared to O2/N2 mode. All gas emissions increased with oxygen enrichment except for CO in both cases. O2/RFG case appears to be more promising option considering emission amounts per unit energy input. [Display omitted] •A 30 kWth CFB system was modeled and experimentally validated.•Oxygen enriched and oxy-combustion cases were studied.•Excess oxygen ratio was kept constant at 1.45 for all cases.•Temperature profiles along the reactor were plotted for different O2 concentrations.•Qualitative and quantitative gas emissions were investigated.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2021.05.058