Chemical-looping combustion in a 100 kW unit using a mixture of synthetic and natural oxygen carriers – Operational results and fate of biomass fuel alkali
Artikel i vetenskaplig tidskrift, 2019

Biomass fuel use in chemical looping combustion enables negative CO2 emissions through BECCS (Bio-Energy Carbon Capture and Storage). Effective biomass utilization in CLC requires an economical and effective oxygen carrier to achieve high fuel conversion, effective CO2 capture, and management of the harmful effects of biomass alkali release (bed agglomeration, oxygen carrier deactivation, fouling and corrosion). These issues were addressed in 100 kW CLC pilot experiments. Building on previous work, a mixture of a synthetic calcium manganite perovskite and natural ilmenite was used as the oxygen carrier. Four biomass fuels of varied alkali content were tested: black pellets of steam-exploded stem wood (BP), BP impregnated with K2CO3, a mixture of 50% BP with 50% straw pellets, and wood char. Experiments showed high fuel conversion and very high CO2 capture, with overall performance exceeding that of ilmenite and manganese ore. More than 95% gas conversion was achieved with black pellets at around 950 °C. The fate of biomass alkali, previously virtually unknown in CLC research, was explored by implementing online surface-ionization-based measurement of alkali released in the flue gases of the fuel reactor (FR) and air reactor (AR). Release levels were found to correlate with the fuel alkali content. The flue gas measurements and bed material elemental analyses suggest that most of the fuel alkali are accumulated in the oxygen carrier. Unexpectedly, it was found that flue gas alkali release occurs in both the FR and AR, with AR exhibiting an equal or higher rate of release vs. the FR.

combustion

carbon capture

fluidized bed combustion

air reactor

Författare

Ivan Gogolev

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 1

Carl Johan Linderholm

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Dan Gall

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

Matthias Schmitz

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Tobias Mattisson

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Jan B. C. Pettersson

Göteborgs universitet

Anders Lyngfelt

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

International Journal of Greenhouse Gas Control

1750-5836 (ISSN)

Vol. 88 371-382

Ämneskategorier

Energiteknik

Kemiska processer

Bioenergi

DOI

10.1016/j.ijggc.2019.06.020

Mer information

Senast uppdaterat

2019-10-03