Effect of biomass ash on preventing aromatization of olefinic cracking products in dual fluidized bed systems
Artikel i vetenskaplig tidskrift, 2023

In this work, the effect of ash activated olivine on olefinic products cracking and aromatization was assessed. The experiments were carried out in the Chalmers 2–4 MWth dual fluidized bed gasifier, where the feedstock was cracked using steam as fluidization agent, at a reaction temperature of ca. 780–790 °C. Three activation states of the olivine, representing three consecutive days of the campaign, were evaluated. The changes of the permanent gas composition along with the reduction in aromatic species with the time of exposure to biomass ash demonstrate a clear effect of the ash activated olivine on the conversion of olefinic cracking products. The ash activation of the olivine clearly promoted the reactions involving steam. As a consequence, higher yields of permanent gases, mainly H2, CO and CO2, were produced at expenses of the yields of the total aromatic compounds and C4 hydrocarbons and larger. It is concluded that the biomass ash activated olivine promotes the steam reforming path of the C4 and larger hydrocarbon fragments, while avoiding the alternative aromatization route. The results presented here provide useful insights on the opportunities and limitations of ash activated materials in DFB systems when steam cracking linear hydrocarbon feedstocks, e.g., polyolefin-based materials.

Catalytic activation

Hydrocarbon cracking

Ash-coated bed material

Biomass ash

Dual fluidized bed

Författare

Judith González Arias

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Teresa Berdugo Vilches

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Chahat Mandviwala

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Isabel Cañete Vela

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Martin Seemann

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Henrik Thunman

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Fuel

0016-2361 (ISSN)

Vol. 338 127256

TWINning for Promoting Excellence, Ability and Knowledge to develop advanced waste gasification Solutions (TWIN-PEAKS)

Europeiska kommissionen (EU) (EC/H2020/951308), 2020-10-01 -- 2023-09-30.

Utveckling av ångrackning av plast för en transformativ omställning av petrokemiska kluster

Borealis GmbH, 2020-01-01 -- 2024-12-31.

Energimyndigheten (49514-1), 2020-01-01 -- 2024-12-31.

Ämneskategorier

Kemiska processer

Annan kemiteknik

Bioenergi

DOI

10.1016/j.fuel.2022.127256

Mer information

Senast uppdaterat

2023-01-09