Effect of oxygen concentration and reaction order on char inventory in fluidized bed combustion

Saastamoinen, Jaakko

doi:10.1016/j.combustflame.2016.06.011

Cited by 2 publications

(1 citation statement)

References 45 publications

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“…The retrofit case has been widely studied in some pilot experiences that have analyzed the combustion performance, emission control and heat release in the boiler [6][7][8][9]. The case of new design using high oxygen concentration in the boiler input has been lately studied in the O2GEN project [10] and several works dealing with combustion [11,12], emissions control [13] and specific features of these systems for heat absorption [14][15][16]. In any case, the use of high oxygen concentration in the oxidant entails the decrease of flue gas volume flow and hence, the reduction of the furnace cross section and the auxiliary power from fans.…”

Section: Introductionmentioning

confidence: 99%

An operational approach for the designing of an energy integrated oxy-fuel CFB power plant

Espatolero

Romeo

Escudero

et al. 2017

International Journal of Greenhouse Gas Control

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Oxy-fuel combustion is one of the key alternatives for coal power production with near-zero CO 2 emissions. Technology has been successfully proved in demonstration facilities and the next step is to improve its efficiency to facilitate the application to future commercial installations. The use of pure oxygen reduces the total volume of flue gases and concentrates CO 2 at boiler outlet. Nevertheless, there is an important energy penalty and efficiency of the power plant substantially decreases around 10-12 efficiency points. Increasing the oxygen concentration in the boiler up to 40% is a recent proposal to raise boiler efficiency and it is also an interesting solution to overcome the energy penalties of the kind of CCS system. Air separation unit (ASU) and compression and purification unit (CPU) are the main processes that reduce the efficiency. Heat integration results mandatory in order to improve the overall power plant efficiency by reducing the energy penalty. Many solutions have tried to show outstanding efficiency results but practical proposals are necessary to develop the technology. The use of flue gases waste energy to recycle flue gases heating up, oxygen preheating and increasing temperature of feedwater to steam cycle has been proposed to surpass the efficiency reduction. Nevertheless, care should be taken as potential problems would appear if only theoretical analysis is carried out. This work deals with a suitable and flexible design to increase the overall efficiency of a second oxy-fuel combustion power plant working with high O 2 concentration. Waste energy has been integrated avoiding any potential risk/damage into a new designed steam cycle. Finally, results are compared with a previously optimized power plant design without operational restrictions and just a slight reduction in power plant net efficiency (less than 1%) was observed between both concepts.

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Section: Introductionmentioning

confidence: 99%

An operational approach for the designing of an energy integrated oxy-fuel CFB power plant

Espatolero

Romeo

Escudero

et al. 2017

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

show abstract

Coal combustion emission and ash formation characteristics at high oxygen concentration in a 1 MWth pilot-scale oxy-fuel circulating fluidized bed

et al. 2017

Applied Energy

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Effect of oxygen concentration and reaction order on char inventory in fluidized bed combustion

Cited by 2 publications

References 45 publications

An operational approach for the designing of an energy integrated oxy-fuel CFB power plant

An operational approach for the designing of an energy integrated oxy-fuel CFB power plant

Coal combustion emission and ash formation characteristics at high oxygen concentration in a 1 MWth pilot-scale oxy-fuel circulating fluidized bed

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