A combustion concept for oxyfuel processes with low recirculation rate – Experimental validation

Becher, V.; Bohn, Jan-Peter; Goanță, Adrian; Spliethoff, Hartmut

doi:10.1016/j.combustflame.2010.12.029

Cited by 45 publications

(9 citation statements)

References 10 publications

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“…According to whether the recycled flue gas is condensed or not, it can be divided into oxy-dry recycle and oxy-wet recycle options, and under the oxy-wet Applied Thermal Engineering, Volume 147, 25 January 2019, Pages 602-609 DOI:10.1016/j.applthermaleng.2018. 10.113 combustion atmosphere, the concentration of water vapor can reach more than 40% [8][9][10], which is much higher than that of conventional air combustion, where steam concentrations are in the range of 6-10% when firing high quality coal. That is, the flue gas in conventional air combustion is mainly N2 (>70%), while it consists primarily of CO2 and H2O in oxy-fuel combustion [11,12].…”

Section: Introductionmentioning

confidence: 94%

A kinetic study on lignite char gasification with CO2 and H2O in a fluidized bed reactor

Tong

Duan

et al. 2019

Applied Thermal Engineering

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Lignite char gasification experiments in CO2, H2O and their mixture were performed in a fluidized bed reactor over the temperature range of 1060K to 1210K. The active sites occupied by different gasifying agents in CO2/H2O mixture were separated and the kinetics was analyzed. Results show that the reactivity of gasification increases rapidly as the temperature rises. The average reaction rate in 50%CO2/50%H2O mixture is slower than the sum of the reaction rates separately, which indicates that CO2 and H2O compete for the same reaction active sites on the char surface. Furthermore, with an increase of temperature, the competition capacity of CO2 gasification over H2O gradually increases, as a result, CO2 gasification occupies more active sites than H2O when the temperature is higher than 1160K. Calculations of the activation energy in the kinetically controlled region based on the shrinking core model reveal that the activation energies follows the trend: N2/CO2>N2/H2O>CO2/H2O.

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Section: Introductionmentioning

confidence: 94%

A kinetic study on lignite char gasification with CO2 and H2O in a fluidized bed reactor

Tong

Duan

et al. 2019

Applied Thermal Engineering

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“…Several groups have considered reducing the recycle ratio in order to minimize the capital and operating costs, as well as the efficiency loss associated with the recycle of such large amounts of flue gas (Nikzat et al, 2004;Becher et al, 2011;Kobayashi and . Bool, 2011;Patrick et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of operating pressure and fuel moisture on net plant efficiency of a staged, pressurized oxy-combustion power plant

Gopan

Kumfer

Axelbaum

2015

International Journal of Greenhouse Gas Control

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“…Burner operation under non-stoichiometric conditions has been studied by Becher et al [14]. They used controlled staging with non-stoichiometric burners (CSNB) to moderate the combustion temperature while reducing the recycle gas flow ratio.…”

Section: Introductionmentioning

confidence: 99%

Staged oxy-fuel natural gas combined cycle

Khallaghi

Hanak

2019

Applied Thermal Engineering

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Exhaust gas recirculation (EGR) in conventional natural gas-fired oxy-combustion cycles is required to maintain the combustion temperature at an allowable level. However, EGR is not beneficial from the system performance perspective. It is difficult to achieve in oxy-fuel cycles due to the high pressure and increased pressure drop in such systems. Consequently, alternative options to control the combustion temperature need to be considered. In this study, staged oxy-fuel natural gas combined cycle (SOF-NGCC) was proposed, which does not require EGR, and its feasibility was evaluated. A process model was developed in Aspen Plus in order to evaluate the thermodynamic performance of the proposed system and to benchmark it against the Allam cycle and conventional NGCC. The optimum net efficiency of the proposed cycle (47.63-51.32%) was shown to be lower than that for Allam cycle (54.58%) and the conventional NGCC without post-combustion capture (PCC) (56.95%). However, the SOF-NGCC is less complex and requires smaller equipment than the Allam cycle. This is mostly because the combined volumetric flow rate into expanders in both topping and bottoming cycles is approximately 25% of that estimated for the Allam cycle. Moreover, with a backpressure of 35 bar, no further compression is required prior to the CO 2 purification unit.

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A combustion concept for oxyfuel processes with low recirculation rate – Experimental validation

Cited by 45 publications

References 10 publications

A kinetic study on lignite char gasification with CO2 and H2O in a fluidized bed reactor

A kinetic study on lignite char gasification with CO2 and H2O in a fluidized bed reactor

Effect of operating pressure and fuel moisture on net plant efficiency of a staged, pressurized oxy-combustion power plant

Staged oxy-fuel natural gas combined cycle

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