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CaMn0.9Mg0.1O3-δ as Oxygen Carrier in a Gas-Fired 10 kWth Chemical-Looping Combustion Unit

Malin Källen (Institutionen för energi och miljö, Energiteknik) ; Magnus Rydén (Institutionen för energi och miljö, Energiteknik) ; Cristina Dueso (Institutionen för energi och miljö, Energiteknik) ; Tobias Mattisson (Institutionen för energi och miljö, Energiteknik) ; Anders Lyngfelt (Institutionen för energi och miljö, Energiteknik)
Industrial & Engineering Chemistry Research (0888-5885). Vol. 52 (2013), 21, p. 6923-6932.
[Artikel, refereegranskad vetenskaplig]

Spray dried particles of the perovskite material CaMn0.9Mg0.1O3-δ have been examined as oxygen carrier for chemical-looping combustion of natural gas. The experiments have been conducted in a continuously operating reactor with the nominal size 10 kWth. The oxygen carrier particles showed excellent ability to convert fuel and complete combustion was reached at certain conditions. In general, the CO2 yield increased with increased fuel reactor temperature and with increased circulation rate. The oxygen carrier was able to release gaseous oxygen through the so called CLOU-mechanism (Chemical-Looping with Oxygen Uncoupling). When the fuel reactor was fluidized by inert gas, there was oxygen release at temperatures above 700°C, reaching a maximum of more than 3% for temperatures above 850°C. Gas phase oxygen was also measured during operation with fuel, as long as the fuel conversion was complete. When the fuel reactor temperature was above 900°C and a high enough circulation rate was maintained, complete combustion of the fuel was achieved with an oxygen concentration in the outlet stream from the fuel reactor of more than 1%. This suggests that a substantial part of the fuel is converted by gaseous oxygen released from the particles. The oxygen carrier particles were subject to more than 350 h of fluidization, of which more than 175 h was at high temperature and more than 55 h with addition of fuel. The particles did not show any tendencies to form hard agglomerations or break down to fines due to attrition during the experiments. Operational problems included high rate of particle elutriation, which was likely an effect of a mismatch between the size and density of the particles, the air flow and the cyclone.

Nyckelord: chemical-looping combustion, chemical-looping with oxygen uncoupling, carbon capture and storage, fluidized bed combustion, perovskites



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Denna post skapades 2013-05-24. Senast ändrad 2016-04-28.
CPL Pubid: 177314

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik

Ämnesområden

Energi
Hållbar utveckling
Energiteknik

Chalmers infrastruktur

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Denna publikation ingår i:


Manganese Combined Oxides as Oxygen Carriers for Chemical-Looping Combustion


 


Projekt

Denna publikation är ett resultat av följande projekt:


Innovative Oxygen Carriers Uplifting chemical-looping combustion (INNOCUOUS) (EC/FP7/241401)