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UTREDNING AV NY METOD FÖR BESTÄMNING AV FUKTHALT I BIOBRÄNSLE: Fukthaltsmätning av biobränsle vid kraftvärmeverket i Sala
Mälardalen University, School of Business, Society and Engineering.
2014 (Swedish)Independent thesis Basic level (university diploma), 180 HE creditsStudent thesis
Abstract [en]

This thesis was carried out in collaboration with Mälardalen University and Sala-Heby Energy AB. The purpose was to investigate if the relative humidity and temperature of the surrounding air in the fuel path through the fuel feeding system is affected by the moisture content of the fuel, and if it is possible to use this method for online measurement for control of the boiler.

The method used in this investigation, is the logging of the relative humidity in the air. The measurement of the relative humidity occurs along the fuel path with five data loggers, termed Tiny tags from the company Intab AB. The measured relative humidity data along the fuel path is then compared against the measurement of the moisture content of the fuel according to the Swedish standard, weighing-drying-weighing method. The purpose is to find the variations of moisture content in the air, according to the hypothesis, to find out if there is a correlation to the fuel moisture content.

The results demonstrate that it is difficult to find good locations along the path of the fuel system to the boiler, to not get saturated air 100 % relative humidity, with the equipment used in this analysis. The location of the measurements which gave the best correlation between the fuel moisture and relative humidity in the air was the location before the fuel crusher. The correlation here was around 46 % which is too low to utilize for the purpose of the moisture determination.

The other measured spaces gave significantly lower correlation. This is assumed due to in the measuring spaces there were airborne wood particles. Those particles affect the sensor when they get stuck on the sensor and the surface moisture from the wood particles gives incorrect readings as result with the instrument used in this project.

Place, publisher, year, edition, pages
2014. , p. 40
Keywords [sv]
förnybar energi, trädbränsle, relativ fuktighet, Tiny tags, online fuktmätning.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-35855OAI: oai:DiVA.org:mdh-35855DiVA, id: diva2:1112035
Subject / course
Energy Engineering
Presentation
2014-05-14, 19:53 (Swedish)
Supervisors
Examiners
Note

180

Available from: 2017-10-25 Created: 2017-06-19 Last updated: 2017-10-25Bibliographically approved

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Citation style
  • apa
  • ieee
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Language
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  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
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