scholarly journals Enhanced performance of chemical looping combustion of methane with Fe2O3/Al2O3/TiO2oxygen carrier

RSC Advances ◽  
2018 ◽  
Vol 8 (70) ◽  
pp. 39902-39912 ◽  
Author(s):  
Hsuan-Chih Wu ◽  
Young Ku
Keyword(s):  
Oxygen Carrier ◽  
Methane Combustion ◽  
Molar Ratio ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Moving Bed

The effect of Fe2O3/CH4molar ratio on fuel and oxygen carrier conversion for methane combustion in the moving bed.

Chemical looping combustion of polyurethane and polypropylene in an annular dual-tube moving bed reactor with iron-based oxygen carrier

Fuel ◽  
2014 ◽  
Vol 135 ◽  
pp. 146-152 ◽  
Author(s):  
Ping-Chin Chiu ◽  
Young Ku ◽  
Hsuan-Chih Wu ◽  
Yu-Lin Kuo ◽  
Yao-Hsuan Tseng
Keyword(s):  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Moving Bed ◽  
Iron Based

Multicycle Study on Chemical Looping Combustion with a CaSO4-CaO Mixed Oxygen Carrier

2019 ◽  
Vol 17 (10) ◽  
Author(s):  
Pu Sixu ◽  
Zheng Min ◽  
Liu Yulou ◽  
Zhao Zhitong ◽  
Sarma Pisupati
Keyword(s):  
Environmental Factor ◽  
Carbon Capture ◽  
Oxygen Carrier ◽  
Total Carbon ◽  
Molar Ratio ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Molar Ratios ◽  
Fuel Reactor ◽  
High Concentrations

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 {{\text{n}}_{{\text{S}}{{\text{O}}_2}}}/{{\text{n}}_{{\text{CO}}}} decreased. However, it led to a drop in CO2 yield and an increase in COS environmental factor. As a whole, the use of CaO additive and higher CO concentration both accelerated the parallel CaSO4 reductions in fuel reactor, especially the selectivity of CaSO4 reduction to CaS.

In Situ Gasification Chemical Looping Combustion of Coal Using the Mixed Oxygen Carrier of Natural Anhydrite Ore and Calcined Limestone

2016 ◽  
Vol 14 (2) ◽  
pp. 637-652 ◽  
Author(s):  
Zheng Min ◽  
Shen Laihong
Keyword(s):  
Coal Gasification ◽  
Oxygen Carrier ◽  
Molar Ratio ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Transfer Capability ◽  
Fuel Reactor ◽  
Optimum Reaction ◽  
The Stability

Abstract The utilization of CaSO4-based oxygen carrier suffers the deactivation problem caused by sulphur loss. To capture the gas sulphides and to improve the stability of CaSO4 oxygen carrier, calcined limestone was introduced into the fuel reactor of Chemical Looping Combustion (CLC). Kinetic behaviors and thermodynamics of the combined process of coal gasification and oxygen carrier reduction using the mixed oxygen carrier CaSO4-CaO under different atmospheres were investigated. The effects of reaction temperature, gasification intermediate, and molar ratio of CaO to CaSO4 on gas sulphide emissions, CO2 generation, and distribution of other gas emissions and characterization of solid products are taken into account. It is found the CaO-based additive evidently suppressed the sulphur emissions, and improved both chemical reaction rate and CO2 generation efficiency. The sulfation products, both CaS and CaSO4, can be used as oxygen carrier later. The optimum reaction parameters are evaluated and obtained in terms of gas sulphide emissions, CO2 capture, other gas releases and maintenance of oxygen transfer capability.

Reactivity of a NiO/Al2O3 oxygen carrier prepared by impregnation for chemical-looping combustion

Fuel ◽  
2010 ◽  
Vol 89 (11) ◽  
pp. 3399-3409 ◽  
Author(s):  
Cristina Dueso ◽  
Alberto Abad ◽  
Francisco García-Labiano ◽  
Luis F. de Diego ◽  
Pilar Gayán ◽  
...  
Keyword(s):  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping

scholarly journals Development of CuFeMnAlO4+δ oxygen carrier with high attrition resistance and 50-kWth methane/air chemical looping combustion tests

2021 ◽  
Vol 286 ◽  
pp. 116507
Author(s):  
Ranjani Siriwardane ◽  
Jarrett Riley ◽  
William Benincosa ◽  
Samuel Bayham ◽  
Michael Bobek ◽  
...  
Keyword(s):  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Combustion Tests ◽  
Attrition Resistance

scholarly journals Effect of the oxygen carrier ilmenite on NOX formation in chemical-looping combustion

2021 ◽  
Vol 222 ◽  
pp. 106962
Author(s):  
Stefan Mayrhuber ◽  
Fredrik Normann ◽  
Duygu Yilmaz ◽  
Henrik Leion
Keyword(s):  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Nox Formation
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