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Study of the transient release of water vapor from a fuel bed of wet biomass in a reciprocating-grate furnace
Linnaeus University, Sweden.
RISE - Research Institutes of Sweden, Built Environment, Building Technology.
Linnaeus University, Sweden.
Linnaeus University, Sweden.
2019 (English)In: Journal of the Energy Institute, ISSN 1743-9671, Vol. 92, no 4, p. 843-854Article in journal (Refereed) Published
Abstract [en]

The present study investigates how sudden changes in fuel moisture affected the combustion characteristics of the fuel bed in a 4-MW reciprocating-grate furnace. The moisture content of the fuel fed to the furnace was monitored online using a near-infrared spectroscopy device, and the water vapor concentration in the flue gas was measured continuously. To obtain experimental data on fuel-bed conditions, the temperature and gas composition in the bed were measured using a probe. A simplified drying model was developed using the measured gas composition values as inputs. The model was then used to estimate the drying rate and to simulate the extent of the drying zone along the grate. Measurements indicated that a change in the moisture content of the fuel fed to the furnace was detected as a change in water vapor concentration in the flue gas with a delay of about 2 h. The model predicted that a portion of wet fuel would need about 2 h to become dry, in line with the measured time delay of the water vapor concentration change in the flue gas. Overall, there was good alignment between the measured and simulated results, supporting the validity of the model and the assumed mechanisms. © 2018 Energy Institute

Place, publisher, year, edition, pages
2019. Vol. 92, no 4, p. 843-854
Keywords [en]
Drying model, Fuel bed, Gas analysis, Grate combustion, Moisture, Combustion, Drying, Flue gases, Flues, Fuels, Furnaces, Infrared devices, Moisture determination, Near infrared spectroscopy, Water vapor, Combustion characteristics, Gas compositions, Grate furnaces, Simulated results, Sudden change, Transient release, Water vapor concentration, Gas fuel analysis
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-35926DOI: 10.1016/j.joei.2018.06.014Scopus ID: 2-s2.0-85053155711OAI: oai:DiVA.org:ri-35926DiVA, id: diva2:1261084
Note

Funding details: KK, Stiftelsen för Kunskaps- och Kompetensutveckling; Funding details: FEDER, European Regional Development Fund;

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2019-07-01Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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