Paper details

Title:

Fuel Indexes - A Novel Method for the Evaluation of Relevant Combustion Properties of New Biomass Fuels

Author(s):

Brunner, T., Sommersacher, P., Obernberger, I.

Document(s):

Abstract:

The increasing demand for biomass fuels leads to the introduction of new biomass fuels into the biomass fuel market. These new biomass fuels (e.g. wastes and residues from agriculture and the food industry, short rotation coppices and energy crops) are usually not well defined regarding their combustion behaviour. Therefore, fuel characterisation methods with a special focus on combustion related problems (gaseous NOx, HCl and SOx­emissions, ash melting behaviour and PM emissions) have to be developed. For this purpose fuel indexes are an interesting option. Fuel indexes are derived from chemical fuel analyses and provide the possibilities for a pre­evaluation of combustion relevant problems that may arise from the utilisation of a new biomass fuel. A possible relation to describe the corrosion risk is for instance the 2S/Cl ratio. The N content in the fuel is an indicator for NOx­emissions, whereas the molar (K+Na) / [3*(2S+Cl)] ratio gives a first prediction regarding the potential for gaseous HCl and SOx-emissions. The Si/K ratio can provide first information about the K release from the fuel to the gas phase. The molar Si / (Ca+Mg) ratio can give indications regarding the ash melting temperatures for non P rich fuels. For P rich fuels the (Si+P+K) / (Ca+Mg) ratio can be used for the same purpose. Following, the fuel indexes mentioned can be used for a first pre-evaluation of combustion relevant properties of biomass fuels. Therefore, time consuming and expensive combustion tests can partly be saved. The indexes mentioned are especially developed for grate combustion plants, as interactions of the bed material possible in fluidised bed combustion systems are not considered.

Keywords:

biomass combustion, solid biofuels, biomass characterisation, biomass characterization

Topic:

Biomass Conversion Technologies for Heating, Electricity and Chemicals                  

Subtopic:

Combustion for large utility

Event:

19th European Biomass Conference and Exhibition

Session:

VP2.2.14

Pages:

1351 - 1357

ISBN-13:

978-88-89407-55-4

ISBN-10:

88-89407-55-7

Paper DOI:

10.5071/19thEUBCE2011-VP2.2.14

Price:

FREE