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Scaling of natural-gas flames for fire-tube package boiler
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The MECBURN project addresses the issue of scaling burners fired with natural gas. The burners feature a complex three-dimensional geometry and the flames may be classified as partially premixed non-swirling diffusion flames. The burners have been scaled using a constant velocity scaling with an additional requirement of preserving the same degree of premixing. At each thermal input a comprehensive in-furnace measurements have been carried out. The objective of this thesis is to analyse further the MECBURN data and contribute to the interpretation of them. To interpret the heat transfer issue, a plug-flow mathematical model has been developed. The model was used to calculate the rate of temperature decay in post-flame region of the flames. The subsequent calculations clearly indicated that the rate of the temperature decay has been determined by the surface to volume ration of the experimental furnaces. It has been observed that the applied burner scaling methodology has resulted in thermal similarity of the flames. From the fluid dynamics point of view the flames have been indeed similar and of the same (normalised) length. The same degree of mixing has been achieved at the same normalised locations (x/Db) for the three thermal inputs. In the post-flame zone substantial departures from the thermal similarity have been observed due to different heat transfer rates.

Place, publisher, year, edition, pages
2003.
Keywords [en]
Technology, combustion, burner, gas, scaling
Keywords [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-41954ISRN: LTU-EX--03/088--SELocal ID: 0095151d-e126-42cd-a86c-ba3c585ae129OAI: oai:DiVA.org:ltu-41954DiVA, id: diva2:1015170
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Citation style
  • apa
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  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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