A comparative process simulation study of Ca—Cu looping involving post-combustion CO2 capture

doi:10.1016/j.cjche.2020.06.033

摘要/Abstract

摘要： This work presents a simulation study of several Ca—Cu looping variants with CO₂ capture, aiming at both parameter optimization and exergy analysis of these Ca—Cu looping systems. Three kinds of Ca—Cu looping are considered: 1) carbonation-calcination/reduction-oxidation; 2) carbonation-oxidation-calcination/reduction and 3) carbonation/oxidation-calcination/reduction. A conventional Ca looping is also simulated for comparison. The influences of the calcination temperature on the mole fractions of CO₂ and CaO at the calciner outlet, the CaCO₃ flow rate on the carbonator performance and the Cu/Ca ratio on the calciner performance are analyzed. The second kind of Ca—Cu looping has the highest carbonation conversion. At 1 × 10⁵ Pa and 820 °C, complete decomposition of CaCO₃ can be achieved in three Ca—Cu looping systems, while the operation condition of 1 × 10⁵ Pa, 840 °C is required for the conventional Ca looping system. Furthermore, the Cu/Ca molar ratio of 5.13-5.19 is required for the Ca—Cu looping. Exergy analyses show that the maximum exergy destruction occurs in the calciner for the four modes and the second Ca—Cu looping system (i.e., carbonation-oxidation-calcination/reduction) performs the highest exergy efficiency, up to 65.04%, which is about 30% higher than that of the conventional Ca looping.

关键词: Ca—Cu looping, CO₂ capture, Process systems, Numerical simulation, Exergy

Abstract: This work presents a simulation study of several Ca—Cu looping variants with CO₂ capture, aiming at both parameter optimization and exergy analysis of these Ca—Cu looping systems. Three kinds of Ca—Cu looping are considered: 1) carbonation-calcination/reduction-oxidation; 2) carbonation-oxidation-calcination/reduction and 3) carbonation/oxidation-calcination/reduction. A conventional Ca looping is also simulated for comparison. The influences of the calcination temperature on the mole fractions of CO₂ and CaO at the calciner outlet, the CaCO₃ flow rate on the carbonator performance and the Cu/Ca ratio on the calciner performance are analyzed. The second kind of Ca—Cu looping has the highest carbonation conversion. At 1 × 10⁵ Pa and 820 °C, complete decomposition of CaCO₃ can be achieved in three Ca—Cu looping systems, while the operation condition of 1 × 10⁵ Pa, 840 °C is required for the conventional Ca looping system. Furthermore, the Cu/Ca molar ratio of 5.13-5.19 is required for the Ca—Cu looping. Exergy analyses show that the maximum exergy destruction occurs in the calciner for the four modes and the second Ca—Cu looping system (i.e., carbonation-oxidation-calcination/reduction) performs the highest exergy efficiency, up to 65.04%, which is about 30% higher than that of the conventional Ca looping.

Key words: Ca—Cu looping, CO₂ capture, Process systems, Numerical simulation, Exergy

Xiaoyu Wang, Haibo Zhao, Mingze Su. A comparative process simulation study of Ca—Cu looping involving post-combustion CO₂ capture[J]. 中国化学工程学报, 2020, 28(9): 2382-2390.

Xiaoyu Wang, Haibo Zhao, Mingze Su. A comparative process simulation study of Ca—Cu looping involving post-combustion CO₂ capture[J]. Chinese Journal of Chemical Engineering, 2020, 28(9): 2382-2390.

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A comparative process simulation study of Ca—Cu looping involving post-combustion CO₂ capture

A comparative process simulation study of Ca—Cu looping involving post-combustion CO₂ capture

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