Pilot-scale combustion of fast-pyrolysis bio-oil: Ash deposition and gaseous emissions

Fast pyrolysis is a promising method to transform solid biomass into a liquid product called “bio‐oil” with an energy density of four to five times greater than the feedstock. The process involves rapidly heating biomass to 450–600°C in the absence of air and condensing the vapor produced to give bi...

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Bibliographic Details
Published in:Environmental progress 2009-10, Vol.28 (3), p.397-403
Main Authors: Khodier, Ala, Kilgallon, Paul, Legrave, Nigel, Simms, Nigel, Oakey, John, Bridgwater, Tony
Format: Article
Language:English
Subjects:
Applied sciences
ash deposition
Atmospheric pollution
bio-oil
biomass
Chemical engineering
combustion
corrosion
emissions
Exact sciences and technology
General processes of purification and dust removal
Heat exchangers and evaporators
Pollution
Prevention and purification methods
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Summary:Fast pyrolysis is a promising method to transform solid biomass into a liquid product called “bio‐oil” with an energy density of four to five times greater than the feedstock. The process involves rapidly heating biomass to 450–600°C in the absence of air and condensing the vapor produced to give bio‐oil. Typically, 50–75% (weight) of the feedstock is converted into bio‐oil that has a number of uses, for example energy production or bio‐refinery feedstock. This study investigated the gaseous emissions and ash deposition characteristics resulting from bio‐oil combustion in a pilot scale combustion test rig at Cranfield University. A feeding system with heated lines and heated/stirred reservoir was used to feed a spray nozzle in the combustion chamber. Ash deposit samples were collected from the resulting flue gas using three air‐cooled probes that simulate heat exchanger tubes with surface temperatures of 500, 600, and 700°C. The deposits formed were analyzed using SEM/EDX and XRD techniques to assess the corrosion potential of the deposits. The results are compared to measured ash deposit compositions formed from biomass combustion. Thermodynamic modeling software was used to make predictions for the partitioning of a range of elements for bio‐oil combustion and the results compared to the measured data. © 2009 American Institute of Chemical Engineers Environ Prog, 2009
ISSN:1944-7442
1944-7450
DOI:10.1002/ep.10379