Experimental evaluation of primary measures for NOX and dust emission reduction in a novel 200 kW multi-fuel biomass boiler

Georg Archan*, Andrés Anca-Couce, Markus Buchmayr, Christoph Hochenauer, Johann Gruber, Robert Scharler

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The aim of this work is to utilize various biogenic fuels without ash slagging and to significantly reduce NOX and particulate matter emissions in comparison to modern combustion technologies. For this purpose, a novel small-scale multi-fuel biomass grate furnace technology was developed and experimentally investigated. It employs a low oxygen concentration in the fixed-bed and a double air staging, including the supply of flue gas recirculation. In this way slagging is prevented on the grate, reducing the release of ash-forming volatiles, NOX emissions are minimized in the reduction zone and an efficient flue gas burnout is achieved in the tertiary zone. Wood pellets and chips as well as miscanthus briquettes were investigated. The measured total particle emissions showed a reduction of 68% for pellets and 70% for wood chips compared to typical small-scale furnaces. Furthermore, a reduction of NOX emissions of 39% for wood chips, 40% for wood pellets and 45% for miscanthus briquettes was achieved compared to typical small-scale furnaces. The experimental parameter study provided fundamental insights into the various mechanisms involved in this novel technology, which is close to market introduction, and proved its high fuel flexibility and great potential for particulate matter and NOX emission reduction.

Original languageEnglish
Pages (from-to)1186-1196
Number of pages11
JournalRenewable Energy
Volume170
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Biomass combustion
  • Dust reduction
  • Emission reduction
  • Fuel flexibility
  • Furnace
  • NO reduction

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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