Influence of moisture contents on the fast pyrolysis of trommel fines in a bubbling fluidized bed reactor

Eke, Joseph, Onwudili, Jude and Bridgwater, Anthony V (2019). Influence of moisture contents on the fast pyrolysis of trommel fines in a bubbling fluidized bed reactor. Waste and Biomass Valorization ,

Abstract

In this study, the effect of moisture contents (2.69 wt% (bone-dry), 5 wt% and 10 wt%) on product yields and process conversion efficiency during fast pyrolysis of a pre-treated trommel fines feedstock was investigated at 500 ᵒC. Experiments were carried out using a 300 g h-1 bubbling fluidised bed rig. Yields of organic liquids ranged from 15.2 – 19.6 wt% of feedstock, which decreased with increasing moisture content. Hence, the bone-dry feedstock gave the maximum yield and consequently the highest process conversion efficiency of 43%. Increased moisture content also led to increase formation of unidentified gas products, indicating increased conversion of organic liquids. Due to the high ash content of the feedstocks, about 52 wt% solid residues, containing around 82% ash was recovered in the char pot in each case. Hence, to maximize oil yields during fast pyrolysis, trommel fines would require extensive drying to remove the original 46 wt% moisture as well as reducing the ash content considerably. XRF analysis of the ash in the feedstock and solid residues showed that the main elements present included Ca, Si, Fe, Pb, K, Cl and Al. Apart from the presence of Pb (which may be from the glass contents of the feedstock), the solid residues could be used for land reclamation or co-incinerated at cement kilns for cement manufacture.

Publication DOI: https://doi.org/10.1007/s12649-018-00560-2
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > European Bioenergy Research Institute (EBRI)
Engineering & Applied Sciences > Chemical Engineering & Applied Chemistry
Additional Information: © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Uncontrolled Keywords: Trommel fines, moisture content, fast pyrolysis, energy recovery, pyrolysis liquid, ash
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Related URLs: https://link.sp ... 649-018-00560-2 (Publisher URL)
Accepted Date: 2018-12-24
Published Online Date: 2019-05-04
Authors: Eke, Joseph
Onwudili, Jude ( 0000-0002-5355-9970)
Bridgwater, Anthony V ( 0000-0001-7362-6205)

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