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Radio Frequency System for Measuring Characteristics of Biofuels
Mälardalens högskola, Institutionen för samhällsteknik.
Ansvarlig organisasjon
2005 (engelsk)Inngår i: IMTC 2005 – Proceedings of the IEEE Instrumentation and Measurement Technology Conference Ottawa, Canada, 17-19 May 2005, IEEE , 2005, Vol. 2, s. 978-983Konferansepaper, Publicerat paper (Fagfellevurdert)
sted, utgiver, år, opplag, sider
IEEE , 2005. Vol. 2, s. 978-983
Identifikatorer
URN: urn:nbn:se:mdh:diva-3992ISBN: 0-7803-8879-8 (tryckt)OAI: oai:DiVA.org:mdh-3992DiVA, id: diva2:120493
Tilgjengelig fra: 2008-11-17 Laget: 2008-11-17bibliografisk kontrollert
Inngår i avhandling
1. Rapid measurements of the moisture content in biofuel
Åpne denne publikasjonen i ny fane eller vindu >>Rapid measurements of the moisture content in biofuel
2006 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

An increasing number of power plants in Scandinavia are beginning to use biofuel instead of coal or oil. The material in the new fuel is a mixture of woodchips, mostly Pine, Spruce and Salix, bark, GROT (tops and branches from felling waste) and sawdust from sawmills. It is heterogeneous, having a moisture content varying from 15% up to 65%. The moisture content affects the combustion of the fuel and therefore its commercial value. The industry is now interested in obtaining a method for measuring the moisture content of biofuel, quickly and reliably; preferably on delivery at the power plant.

The measuring technique presented in this thesis is the first reported in the literature capable of measuring the moisture content of a large sample of such an heterogeneous material as biofuel. The equipment is today calibrated for a sample volume of 0.1 m3. A radio frequent signal is supplied from an antenna and penetrates the biofuel. Its reflection is modeled using partial least squares.

As part of the work presented in this thesis, a new type of measuring rig and an analysis method for measurement of the moisture content of large samples of heterogeneous material have been developed. A statistical model for moisture content measurements of five different biofuel materials using radio waves has been built, having a root mean square error of prediction of 2.7. The interactions between biofuels and radio frequent signals have been demonstrated, indicating a variation of the reflection with varying types of biofuel material and variation in the reflection and delay of the signal with varying moisture content.

sted, utgiver, år, opplag, sider
Institutionen för Samhällsteknik, 2006. s. 147
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 24
Emneord
radiofrequency measurement, moisture content measurement, fuel characterization, biofuel, time domain measurement, Bulk measurement, Multivariate data analysis
Identifikatorer
urn:nbn:se:mdh:diva-130 (URN)91-85485-08-X (ISBN)
Disputas
2006-01-27, Lambda, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2008-11-17 Laget: 2008-11-17bibliografisk kontrollert

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