Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588061
Title: The characterisation of biomass and biomass/coal blends
Author: Pang, Cheng Heng
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2012
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Abstract:
A series of detailed studies have been performed to further understand the characteristics of biomass for solid fuel combustion purposes. The characterisation work was carried out in three separate (but interrelated) parts studying each of the different forms/stages of biomass during combustion i.e. original raw biomass, biomass char and biomass ash, respectively. These findings were examined and correlated to see if predictions about combustion behaviour could be made. The effects of blending biomass and coal on milling performance and ash behaviour were also investigated to show the relevance of co-milling and co-firing. The lignocellulosic components, i.e. lignin, cellulose and hemicellulose are the key constituents of plants cell wall, and hence form the major part of biomass. The contributions of these components on biomass behaviour were explored by analysing a matrix of samples with varying lignocellulosic compositions including; a base suite of 11 biomass samples with different lignocellulose contents; samples pre-treated chemically to alter their compositions; pseudo biomass samples synthesised by mixing commercially obtained lignin, cellulose and hemicellulose in different weight percentages. All raw samples, both treated and untreated, as well as their corresponding char samples prepared via the fast heating drop tube furnace and slow heating muffle furnace, were analysed to determine their respective thermal properties, structural characteristics, grindability, etc. Ash samples were characterised using the sinter strength test and the newly developed PAnG (Picture Analysis and Graphing) advanced ash fusion test. The former was originally devised for coal ash characterisation whilst the latter was designed to accommodate the large variability in fuels. The PAnG test incorporates dilatometry and sinter strength test by means of image analysis. It is believed that lignin, cellulose and hemicellulose play a significant role in determining the characteristics of biomass. Results have shown that the data of raw biomass, biomass char and biomass ash correlate well with that of lignocellulosic composition. The major components of biomass, particularly cellulose and/or lignin, reflect the various behaviours of biomass in different ways, and hence can be used as a potential predictive tool. Depending on the original unblended fuel, the blending of biomass and coal at different weight percentages can have favourable effects on fuel properties.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.588061  DOI: Not available
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