Carbonation of fly ash in oxy-fuel CFB combustion

Wang, Chunbo; Jia, Lei; Tan, Yewen; Anthony, Edward J.

doi:10.1016/j.fuel.2007.06.024

Cited by 85 publications

(74 citation statements)

References 26 publications

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“…Rao et al [31] performed carbon capture with CFBC ash and pure CO 2 gas through sonochemical treatment at temperatures of between 20 and 80 • C. It was confirmed that the conversion rate of CaO is high at high temperatures during the carbonation reaction. Wang et al [16] calculated the carbonation activation energy, and CaO carbonation conversion ratio of CFBC fly ash at temperatures of 250 to 850 • C, and H 2 O levels of 0%, 8%, and 15% using CO 2 gas of 80% concentration, and confirmed that CaO carbonation occurs at high temperatures, as well as at high H 2 O levels.…”

Section: Introductionmentioning

confidence: 90%

Mineral Sequestration of Carbon Dioxide in Circulating Fluidized Bed Combustion Boiler Bottom Ash

Kim

Lee

2017

Minerals

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This paper investigates the mineral sequestration of carbon dioxide in circulating fluidized bed combustion (CFBC) boiler bottom ash. CFBC bottom ash, which originated from two sources, was prepared along with pulverized coal-fired (PC) boiler bottom ash as a control. These ashes were exposed to accelerated carbonation conditions at a relative humidity of 40% and 100%, in order to investigate the effects of humidity on the carbonation kinetics of the bottom ash. The obtained results showed that not only lime but other calcium-bearing phases (gehlenite, wollastonite, and brownmillerite) in CFBC bottom ash participated in the mineral carbonation reaction. In particular, these phases underwent hydration in a wet carbonation environment, whereby the carbon dioxide uptake and capacity of CFBC bottom ash are significantly enhanced. This study may have important implications, demonstrating the feasibility of carbon dioxide sequestration and recycling of CFBC boiler bottom ash.

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Section: Introductionmentioning

confidence: 90%

Mineral Sequestration of Carbon Dioxide in Circulating Fluidized Bed Combustion Boiler Bottom Ash

Kim

Lee

2017

Minerals

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“…Wang et al 13 In this work variables affecting sorbent capacity were studied by an isothermal method. Results of this work will help to produce more effective design and control strategy of the Ca-looping process.…”

Section: Cao Co Cacomentioning

confidence: 99%

Effect of Steam During both Calcination and Carbonation of CaO in CFBB

Hongcai¹,

Wang²

2016

dteees

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Abstract. Ca-looping is a potentially effective method for CO 2 capture from coal fired power plants. In this work, using a custom made tube furnace experimental system that can measure sample weight changes at constant temperatures, water vapor effect on calcination and carbonation of calcium based CO 2 sorbent are studied. The effects of steam present in calcination and carbonation process is determined. It is found that steam has a positive overall effect on CO 2 capture in the Ca-looping process. When present in both calcination and carbonation processes, steam can increase the decomposition rate of the CaCO 3 and enhance the subsequent carbonation conversion of the calcined CaO.

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“…Compared with typical air-fuel systems, the combustion process (as well as pollutant formation) will be different in the oxy-fuel combustion process due to the high CO 2 level (Chui et al, 2003;Wang et al, 2008). Undiluted, the temperature of oxy-fuel combustion will be much higher than that of air combustion because of the absence of nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Effect of dilution of fuel in CO2 on the conversion of NH3 to NO x during oxy-fuel combustion

Qiu

Yang

You

et al. 2015

J. Zhejiang Univ. Sci. A

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Abstract:The indirect chemical effects of fuel dilution by CO 2 on NO formation were investigated numerically in this paper. CH 4 doped with NH 3 was used as fuel, while CO 2 and O 2 were mixed as oxidant. The dilution effect of CO 2 was then investigated through adding extra CO 2 to the reaction system. An isothermal plug flow reactor was used. An unbranched chain reaction mechanism is proposed to illustrate the chemical effects of CO 2 on the H/O/OH radical pool and NO x . Due to the reaction between CO 2 and H, extra NO will be formed in fuel-rich conditions, while NO will be inhibited in fuel-lean conditions and high CO 2 dilution conditions. The reaction affected the radical pools of OH, H, and O of the branched chain reaction, and then the formation and reduction of NO. The pool of H had the greatest effect on NO reduction. The results suggest that the indirect chemical effects on NO formation differ between diluted fuel oxy-fuel combustion conditions and normal oxy-fuel conditions.

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Carbonation of fly ash in oxy-fuel CFB combustion

Cited by 85 publications

References 26 publications

Mineral Sequestration of Carbon Dioxide in Circulating Fluidized Bed Combustion Boiler Bottom Ash

Mineral Sequestration of Carbon Dioxide in Circulating Fluidized Bed Combustion Boiler Bottom Ash

Effect of Steam During both Calcination and Carbonation of CaO in CFBB

Effect of dilution of fuel in CO2 on the conversion of NH3 to NO x during oxy-fuel combustion

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