Multicycle Study on Chemical Looping Combustion with a CaSO4-CaO Mixed Oxygen Carrier
-
Pu Sixu
,
Liu Yulou
Abstract
Chemical looping combustion (CLC) is a carbon capture technology which enables CO2 capture with low net efficiency penalty. Calcium sulfate (CaSO4) is an optional oxygen carrier for commercial use, but its usage is limited due to sulfur dioxide (SO2) emission. This study approaches this issue by adding CaO species into the CaSO4 oxygen carrier to inhibit the release of SO2 from CaSO4 oxygen carrier. In this study, the cyclical tests of a CaSO4-based oxygen carrier under alternating reducing and oxidizing conditions were performed at 900 °C and 800 °C respectively in a tubular furnace reactor at atmospheric pressure. The effects of reducing gas concentration and molar ratio of CaO/CaSO4 on the performance of CaSO4-CaO oxygen carrier were studied in terms of CO2 yields, Environmental factors of SO2 and COS, molar ratios of gas sulfides to CO2 generated in fuel reactor, and molar ratios of SO2 and COS to total carbon inlet. The use of CaO additive increased the yields of CO2 obviously. The release of COS in the fuel reactor and SO2 in the air reactor decreased, but while the overall release of SO2 in the fuel reactor increased. However, for per mole CO2 generation, less gas sulfides released from the fuel reactor. High concentrations of CO were beneficial for CO2 production and a low SO2 environmental factor, and meanwhile, the molar ratios of SO2 released to inlet CO
Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 51866003), Scientific and Technological Leading Talent Projects in Yunnan Province (No. 2015HA019), and China Scholarship Council (File No. 201808530023).
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Artikel in diesem Heft
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Artikel in diesem Heft
- Articles
- Numerical Simulation of Flow Characteristics in an Inclining Rotating Kiln with Continuous Feeding
- Minimum Fluidization Velocity of Intermediate Sized Particles in Conventional and Packed Fluidized Bed
- Multicycle Study on Chemical Looping Combustion with a CaSO4-CaO Mixed Oxygen Carrier
- Economic Optimization of Rare Earth Element Leaching Kinetics from Phosphogypsum with Sulfuric Acid
- Heat Transfer Characteristics of Nitrogen in Supercritical Region Using Redlich-Kwong Equation of State
- Chattering Free Sliding Mode Control with Observer Based Adaptive Radial Basis Function Neural Network for Temperature Tracking in a Fixed Bed Reactor
- Role of Support in Hydrocracking of n-hexadecane over Sulfided NiMo Catalysts
- Leaching of Indium from Indium-and Iron-Bearing Sphalerite Concentrate in Sulfuric Acid–Ferric Sulfate Solution
- Electrochemical Behavior of Fe3O4 in NaCl-CaCl2 Melts
- Effect of the Impurity Ions on the Crystallization of Urea Phosphate
