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Development of Binder-Supported CaSO4 Oxygen Carriers for Chemical Looping Combustion of Methane

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Cleaner Combustion and Sustainable World (ISCC 2011)

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Abstract

Chemical-looping combustion (CLC) has been recognized as an energy-efficient method for CO2 capture. From thermodynamics point of view, CaSO4 has a good availability in the cycle of CLC system. The inhibition of the poor mechanical strength and reactivity is fatal to a CLC system based on calcium sulfate (CaSO4). In this study, three important parameters (binder, acetic acid, and water) were selected as factors of the L9 orthogonal experiment designed to investigate the performance of the binder-supported CaSO4 oxygen carriers by intuitive analysis. Then, the suitable oxygen carriers were comprehensively studied in a fixed bed reactor. The orthogonal experiment results showed that adding binder enhanced the mechanical strength and increased the conversion of the binder-supported CaSO4, and the optimal extrusion condition was: 30 g CaSO4, 12 g SB powder (sticky pseudo-boehmite), 2.5 ml acetic acid, and 15 ml water. The results of reduction reactivity showed the conversion and mass-based reaction rates of the binder-supported CaSO4 were obviously enhanced. Moreover, the favorable performance of the binder-supported CaSO4 was explained by formation of CaAl2O4. This compound was excellent thermal stability and provided a stable nanosized framework between the crystal grains observed by field emission scanning electron microscope.

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Abbreviations

I j :

Level j corresponding conversion average in the corresponding column

K j :

Level j corresponding crushing strength average in the corresponding column

m :

Mass of oxygen carrier (kg)

\( {{m}_{\rm{ox}}} \) :

Mass of the fully oxidized oxygen carrier (kg)

\( {{m}_{\rm{ox1}}} \) :

Mass of calcium sulfate in the sample (kg)

\( {{m}_{\rm{red}}} \) :

Mass of the fully reduced oxygen carrier (kg)

\( {{M}_{\rm{O}}} \) :

Atomic weight of oxygen (kg/mol)

\( {{\dot{n}}_{\rm{out}}} \) :

Molar flow of the gas exiting the reactor after condensation (mol/s)

\( {{R}_{\rm{O}}} \) :

Oxygen ratio of the oxygen carrier defined as \( {{R}_{\rm{O}}} = ({{m}_{{ox}}} - {{m}_{{red}}})/{{m}_{{ox}}} \)

\( {{R}_{\rm{O1}}} \) :

Oxygen ratio of calcium sulfate

\( \frac{{{\text{d}}X}}{{{\text{d}}t}} \) :

The reduction rate of oxygen carrier (1/s)

\( {{X}_{\rm{r}}} \) :

Oxygen carrier conversion during the reduction

\( {{y}_{{{\rm{i,out}}}}} \) :

Outlet molar fraction of the gas species i exiting the reactor after condensation

Z :

Extreme difference

\( \Delta X \) :

Change of the conversion of oxygen carrier

\( \Delta \omega \) :

Change of the mass conversion of oxygen carrier

\( \omega \) :

Mass based conversion of oxygen carrier

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Acknowledgment

The authors acknowledge the financial supports of the Special Funds for National Basic Research Program of China (No.2011CB707301), the National Natural Science Foundation of China (No.50936001, 51021065).

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Authors and Affiliations

  1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, 430074, China

    Ning Ding, Ying Zheng, Cong Luo, Guan Bian, Peifang Fu & Chuguang Zheng

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  1. Ning Ding
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  2. Ying Zheng
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  3. Cong Luo
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  4. Guan Bian
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  5. Peifang Fu
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  6. Chuguang Zheng
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Corresponding author

Correspondence to Ning Ding .

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Editors and Affiliations

  1. Institute of Thermal Engineering, Tsinghua University, Beijing, China, People's Republic

    Haiying Qi

  2. Institute of Thermal Engineering, Tsinghua University, Beijing, China, People's Republic

    Bo Zhao

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Ding, N., Zheng, Y., Luo, C., Bian, G., Fu, P., Zheng, C. (2013). Development of Binder-Supported CaSO4 Oxygen Carriers for Chemical Looping Combustion of Methane. In: Qi, H., Zhao, B. (eds) Cleaner Combustion and Sustainable World. ISCC 2011. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30445-3_174

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  • DOI: https://doi.org/10.1007/978-3-642-30445-3_174

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-30444-6

  • Online ISBN: 978-3-642-30445-3

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