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09.01.2019 | Original Article | Ausgabe 1/2019

Biomass Conversion and Biorefinery 1/2019

Impact of adhering soil and other extraneous impurities on the combustion and emission behavior of forest residue wood chips in an automatically stoked small-scale boiler

Zeitschrift:
Biomass Conversion and Biorefinery > Ausgabe 1/2019
Autoren:
Thomas Zeng, Daniel Kuptz, Kathrin Schreiber, Claudia Schön, Fabian Schulmeyer, Volker Zelinski, Annett Pollex, Herbert Borchert, Achim Loewen, Hans Hartmann, Volker Lenz, Michael Nelles
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s13399-018-00368-z) contains supplementary material, which is available to authorized users.

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Abstract

Within six case studies, different drying and sieving process steps were employed for the removal of adhering soil and other extraneous impurities from wood chips. Consequently, it was systematically investigated to which extent this strategy can be used to jointly mitigate the risk of bottom ash slagging and high pollutant emission levels during combustion in an automatically stoked small-scale boiler. Throughout all combustion tests, slag and emission formation were recorded. Formation of agglomerates in the bottom ash was not observed in the fuel bed. However, fuel processing resulted in an increase of the ash shrinking–softening range up to 230 K indicating a lower slagging risk in the bottom ash. An asymptotic trend for the ash melting temperatures was observed as a function of the molar (Si + P + K)/(Ca + Mg) ratio. It was also found that potassium is less efficiently retained in the bottom ash with lower Si content in the fuel. Lower moisture contents in the wood chips typically resulted in lower CO emissions and higher boiler efficiencies for the investigated range of moisture content. The sieving of the unprocessed wood chips reduced NOx emission levels up to 28%. However, fuel processing did not necessarily reduce the level of particulate matter emissions.

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Zusatzmaterial
ESM 1 (DOCX 36 kb)
13399_2018_368_MOESM1_ESM.docx
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