Defluidization of ilmenite, an oxygen carrier for chemical looping combustion – laboratory experiments with potassium salts

Forskningsoutput: Kapitel i bok/konferenshandlingKonferensbidragVetenskapligPeer review

Sammanfattning

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.
OriginalspråkOdefinierat/okänt
Titel på gästpublikation30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, July 2-6, San Diego, California : ECOS 2017
RedaktörerAsfaw Beyene
FörlagSan Diego State University
Sidor1–12
StatusPublicerad - 2017
MoE-publikationstypA4 Artikel i en konferenspublikation
EvenemangInternational 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
Varaktighet: 2 jul 20176 jul 2017

Konferens

KonferensInternational Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Period02/07/1706/07/17

Nyckelord

  • Ash interaction
  • Chemical Looping Combustion
  • Ilmenite

Citera det här