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Among the different pollutant gases released from oxy-coal combustion, mercury is the responsible for important operational issues in the CO2 processing unit, being able to cause material corrosion. Some studies concerning the fate of mercury during oxy-coal combustion are referred to pulverized coal (PC) boilers. However, the fate of mercury emissions in fluidized bed (FB) combustors has yet to be...
The use of Ca-based sorbents in circulating fluidized beds (CFB) allows the in-situ desulfurization in oxy-fuel combustion processes. The sulfation process involves important changes in the sorbent morphology, which could vary depending on the operating conditions and be different to those observed in conventional air combustion. This work analyzes the morphological variations observed during limestone...
In this work, SO2 retention via calcium-based sorbents added in a continuous bubbling fluidized bed combustor (∼3kWth) operating in oxy-fuel combustion mode is analyzed. Tests were performed at different operating temperatures with three sorbents, two limestones and one dolomite, and with three coals, ranging from lignite to anthracite, to analyze the influence of coal rank, type of sorbent, sorbent...
Oxy-fuel combustion is one of the leading options for power generation with CO 2 capture. The process consists of burning the fuel with a mixture of nearly pure oxygen and a CO 2 -rich recycled flue gas, resulting in a product flue gas from the boiler containing mainly CO 2 and H 2 O. Among the possible boiler types, fluidised bed combustors are very appropriate for...
In this work, pollutant emissions in a continuous bubbling fluidized bed combustor (∼3kW th ) at oxy-firing conditions were measured. An anthracite coal was used as fuel and a limestone was added for sulfur retention. Flue gas recirculation was simulated by mixing different gases (CO 2 , SO 2 , steam, and NO) and the effect of varying the gas composition of the recycled flow...
Oxy-fuel combustion consists in burning a fuel with a mixture of nearly pure oxygen and a CO2-rich recycled flue gas resulting in a product flue gas from the boiler containing mainly CO2 and H2O.In this work, the effect of combustion temperature and flue gas recycle composition on pollutant emissions and on the sulfation process, in order to optimize the SO2 retention in circulating fluidized beds...
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