Logistics of wood chips supply and performance analysis of an industrial updraft gasifier
department or school: Applied Science, Faculty of
department or school: Chemical and Biological Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Oveisi-Fordiie, Ehsanollah
issued: 2019-12-24T21:07:24Z
issued: 2019
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: In the published literature, there is a lack of detailed data relevant to full-scale gasification plants that operate on variable quality of biomass feedstock, especially those originating from urban sources. The objectives of this study are to characterize the spatial and temporal variations in the physical properties of waste wood supplied to the UBC industrial gasification system; and to conduct an analysis of variations in fuel properties vs. gasifier performance in terms of system reliability, steam production, syngas quality, tar formation, and gasification efficiencfy. The measured values of fuel properties were in compliance with the fuel specifications. Large variation in steam production during the earlier years of operation was attributed partly to the variations in feedstock moisture content and particle size. Subsequent data collection and analysis revealed that fuel moisture content affects the production of steam the most. Fuel moisture content (mc), gasifier bed temperature, and fuel feeding rate were identified to be the key factors that affect syngas quality, tar formation, and gasifier efficiency. Multi-variable regression models were developed to quantify these relationships. Despite a wide variation of the data collected from the industrial gasifier, our results are in line with the trends reported in the literature based on lab-scale and pilot-scale studies. Research findings indicated that even for a commercial updraft gasifier, syngas quality and steam production would be enhanced if the fuel moisture content could be maintained around 20% (wb). With air as the gasifying agent, when fuel moisture content decreased to 20%, the carbon monoxide (CO) concentration (~30%) and calorific value (>4 MJ/m³) would be higher, whereas tar concentration (<60–70 g/m³) would be lower. This near-optimal level of fuel moisture content (20% wb) is recommended for the operation of BRDF. The 20% mc also coincides with the typical equilibrium moisture content of a…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/72980
note: LOGISTICS OF WOOD CHIPS SUPPLY AND PERFORMANCE ANALYSIS OF AN INDUSTRIAL UPDRAFT GASIFIER by Ehsanollah Oveisi-Fordiie B.A.Sc., University of British Columbia, 2003 M.Sc., University of British Columbia, 2011 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Chemical and Biological Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) December 2019 ©Ehsanollah Oveisi-Fordiie, 2019 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the dissertation entitled: Logistics of Wood Chips Supply and Performance Analysis of An Industrial Updraft Gasifier submitted by Ehsanollah Oveisi Fordiie in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemical and Biological Engineering Examining Committee: Shahab Sokhansanj, Chemical and Biological Engineering Co-supervisor Anthony Lau, Chemical and Biological Engineering Co-supervisor Jim Lim, Chemical and Biological Engineering Supervisory Committee Member Paul Watkinson, Chemical and Biological Engineering University Examiner Patrick Kirchen, Mechanical Engineering University Examiner iii Abstract In the published literature, there is a lack of detailed data relevant to full-scale gasification plants that operate on variable quality of biomass feedstock, especially those originating from urban sources. The objectives of this study are to characterize the spatial and temporal variations in the physical properties of waste wood supplied to the UBC industrial gasification system; and to conduct an analysis of variations in fuel properties vs. gasifier performance in terms of system reliability, steam production, syngas quality, tar formation, and gasification efficiencfy. The measured values of fuel properties were in compliance with the fuel specifications. Large variation in steam production during the…
has type: Thesis/Dissertation
date issued: 2020-05
is shown at: 10.14288/1.0387344
language: eng
degree discipline: Chemical and Biological Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/72980