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Moisture Content Measurements on Sawdust with Radio Frequency Spectroscopy
Mälardalens högskola, Institutionen för samhällsteknik.
Ansvarig organisation
2005 (Engelska)Ingår i: Proceedings of ASME Power, Chicago, Illinois, USA, April 5-7, 2005(2005), 2005Konferensbidrag, Publicerat paper (Refereegranskat)
Ort, förlag, år, upplaga, sidor
2005.
Identifikatorer
URN: urn:nbn:se:mdh:diva-3991ISBN: 0791841820 (tryckt)OAI: oai:DiVA.org:mdh-3991DiVA, id: diva2:120492
Tillgänglig från: 2008-11-17 Skapad: 2008-11-17 Senast uppdaterad: 2013-12-04Bibliografiskt granskad
Ingår i avhandling
1. Rapid measurements of the moisture content in biofuel
Öppna denna publikation i ny flik eller fönster >>Rapid measurements of the moisture content in biofuel
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Institutionen för Samhällsteknik, 2006. s. 147
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 24
Nyckelord
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)
Disputation
2006-01-27, Lambda, 13:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2008-11-17 Skapad: 2008-11-17Bibliografiskt granskad

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Thorin, EvaDahlquist, Erik

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Nyström, JennyThorin, EvaDahlquist, Erik
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Institutionen för samhällsteknik

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