Oxygen-blown gasification of pulp mill bark residues for synthetic fuel production
2021 (English)In: Processes, ISSN 2227-9717, Vol. 9, no 1, article id 163Article in journal (Refereed) Published
Abstract [en]
Synthetic fuel production via gasification of residual biomass streams from the pulp and paper industry can be an opportunity for the mills to enable improved resource utilization and at the same time reduce the production of excess heat. This paper summarizes initial oxygen-blown gasification experiments with two bark residues from a European pulp and paper mill, i.e., a softwood bark and a hardwood bark. The gasification process was characterized by measuring syngas yields and process efficiency to find optimum operating conditions. In addition, impurities in the syngas and ash behavior were characterized. Maximum yields of CO and H2 were obtained from softwood bark and amounted to approximately 29 and 15 mol/kg fuel, respectively. Optimum cold gas efficiency was achieved at an oxygen stoichiometric ratio of λ = 0.40 and was approximately 76% and 70% for softwood bark and hardwood bark, respectively. Increased λ had a reducing effect on pollutants in the syngas, e.g., higher hydrocarbons, NH3, HCl, and soot. The situation for sulfur species was more complex. Evaluation of the bark ashes indicated that slag formation could start already from 800◦C. Furthermore, a non-intrusive laser diagnostics technique gave rapid feedback on the millisecond scale. Measured syngas temperature and water content were in good agreement with the applied reference methods. © 2021 by the authors.
Place, publisher, year, edition, pages
MDPI AG , 2021. Vol. 9, no 1, article id 163
Keywords [en]
Bark residues, Gasification, Online TDLAS process measurement, Oxygen blown, Pulp mill, Syngas
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-52222DOI: 10.3390/pr9010163Scopus ID: 2-s2.0-85099947248OAI: oai:DiVA.org:ri-52222DiVA, id: diva2:1527078
Note
Funding details: Horizon 2020; Funding details: Energimyndigheten; Funding details: 818011; Funding text 1: This is exactly the combination of processes that are being studied in the European Pulp & Fuel project within which this work has been performed, i.e., oxygen-blown gasification of bark residues in combination with SCWG of black liquor aiming for synthetic fuel production. The Pulp & Fuel project received funding from the European Union’s Horizon 2020 research and innovation program and consists of ten partners from four European countries. The project addresses the thermochemical conversion of industrial wastes produced at a pulp and paper mill into biofuel.; Funding text 2: Funding: The Pulp&Fuel project, within which this work was mainly carried out, received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 818011. The TDLAS method, for temperature and water concentration measurements, was developed within the Bio4Gasification (B4G) and Swedish Gasification Center (SFC), financed by the Swedish Energy Agency together with academia and industry partners.
2021-02-092021-02-092023-05-16Bibliographically approved