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The experimental study of full-scale biomass-fired bubbling fluidized bed boiler
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-5341-3656
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0001-8191-4901
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0003-1962-2232
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-7233-6916
2014 (English)In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 61, 643-647 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents experimental data concerning combustion characteristics of full-scale biomass-fired bubbling fluidized bed (BFB) steam boiler with a thermal output of 31 MW. The purpose of the experimental measurements is to show how the values of selected combustion parameters vary in reality depending on measurement position. Experimentation involves specifically a determination of combustion gas temperature and concentration of gas species i.e. O2, CO2, CO and NOX at different positions in the furnace and the flue gas trains. Character of results from the furnace indicates the intermediate stage of thermochemical reactions. Increased levels of CO close to the wall have been found, this may be indicating reducing atmosphere and thereby increased corrosion risk. Results from flue gas trains demonstrate that behavior there is related to the fluid dynamics and heat transfer, the temperature is too low for further combustion reactions. Results show great variations among measured values of all measurands depending on a distance along the line from the wall to the center of the boiler. The measurements from permanently installed fixed sensors are not giving value representing average conditions, but overall profiles can be correlated to online measurements from fixed sensors.

Place, publisher, year, edition, pages
2014. Vol. 61, 643-647 p.
Keyword [en]
Biomass combustion; steam boiler; fluidized bed; temperature measurements; flue gas concentration measurements.
National Category
Energy Engineering
Research subject
Energy- and Environmental Engineering; Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-26844DOI: 10.1016/j.egypro.2014.11.1188ISI: 000375936100148Scopus ID: 2-s2.0-84922364736OAI: oai:DiVA.org:mdh-26844DiVA: diva2:769058
Conference
The 6th International Conference on Applied Energy – ICAE2014, Taipei May 30 - June 2 2014
Available from: 2014-12-05 Created: 2014-12-05 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Near-Infrared Spectroscopy and Extractive Probe Sampling for Biomass and Combustion Characterization
Open this publication in new window or tab >>Near-Infrared Spectroscopy and Extractive Probe Sampling for Biomass and Combustion Characterization
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Biomass is characterized by highly variable properties. It can be converted to more valuable energy forms and products through a variety of conversion processes. This thesis focuses on addressing several important issues related to combustion and pulping.

Experimental investigations were carried out on a biomass-fired industrial fluidized-bed boiler. The observed combustion asymmetry was explained by an imbalance in the fuel feed. Increased levels of carbon monoxide were detected close to boiler walls which contribute significantly to the risk of wall corrosion.

Moreover, extensive literature analysis showed that near-infrared spectroscopy (NIRS) has a great potential to provide property information for heterogeneous feedstocks or products, and to directly monitor processes producing/processing biofuels in real-time. The developed NIRS-based models were able to predict characteristics such as heating value, ash content and glass content. A study focusing on the influence of different spectra acquisition parameters on lignin quantification was carried out. Spectral data acquired on moving woodchips were found to increase the representativeness of the spectral measurements leading to improvements in model performance.

The present thesis demonstrates the potential of developing NIRS-based soft-sensors for characterization of biomass properties. The on-line installation of such sensors in an industrial setting can enable feed-forward process control, diagnostics and optimization.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2017
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 224
National Category
Energy Systems Chemical Process Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-35041 (URN)978-91-7485-317-9 (ISBN)
Public defence
2017-04-26, Pi, Mälardalens högskola, Västerås, 09:15 (English)
Opponent
Supervisors
Available from: 2017-03-20 Created: 2017-03-19 Last updated: 2017-04-18Bibliographically approved

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