Abstract
Use of biomass in Chemical Looping Combustion (CLC) and subsequent CO2 capture ideally leads to negative CO2 emissions (Bio-CLC). In Bio-CLC ash-forming matter of biomass, mainly consisting of potassium, calcium, sulfur, phosphorus, and chlorine, may interact with the oxygen carrier, causing agglomeration, and thus inhibit the chemical looping process. The detailed/exact mechanisms behind these effects are not properly understood. Ilmenite, an iron-titanium mineral, can be used as an oxygen carrier in CLC.In this study the interactions between ilmenite and potassium compounds, typical for biofuel ashes, in a labscale furnace were investigated. Mixtures of ilmenite with different potassium compounds were thermally treated in an oxidizing environment at 850 and 950 °C. The interactions between potassium compounds and the carrier material were studied using DTA, XRD, and SEM-EDS. Thermodynamic equilibrium calculations were carried out to verify the reactions. Finally, results from the laboratory tests were used to explain the behavior of ilmenite in the presence of salts in a lab-scale fluidized bed conversion. The bed agglomeration mechanisms depend on the potassium salt: dihydrogen phosphate or chloride glued the particles, whereas carbonate reacted with the bed particles.
Original language | Undefined/Unknown |
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Title of host publication | 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, July 2-6, San Diego, California : ECOS 2017 |
Editors | Asfaw Beyene |
Publisher | San Diego State University |
Pages | 1–12 |
Publication status | Published - 2017 |
MoE publication type | A4 Article in a conference publication |
Event | International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS-2017 Duration: 2 Jul 2017 → 6 Jul 2017 |
Conference
Conference | International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems |
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Period | 02/07/17 → 06/07/17 |
Keywords
- Ash interaction
- Chemical Looping Combustion
- Ilmenite