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Title:

Efficient Reduction of NOx Emissions from Biomass Boilers by an Integrated Three-way Catalyst

Author(s):

Mandl, C., Obernberger, I., Knauss, G., Schirnhofer, L., Breuer, C., Bonifer, M., Joshi, P.

Document(s):

Paper Paper

Abstract:

Within recent years the limitation of NOx emissions for biomass combustion systems gets stricter and stricter. On the other hand the NO content of biomass fuels which is mainly responsible for NOx emissions often varies and increases from pellets over wood chips, bark, SRC to agricultural residues. Do to the strict emissions limits, primary measures for NOx reduction are often not efficient enough. Conventional secondary measures (SNCR or SCR) show considerably higher conversion efficiencies than primary measures but are cost expensive and also induce additional operation costs due to the reducing agents (e.g. urea) needed. Within a nationally funded Austrian research project a novel low-emission biomass combustion technology which ensures ultra-low particulate emissions by an extreme air-staging technology has been further developed by integrating a 3-way catalyst. Test runs at lab- and pilot-scale biomass applications showed that a NOx reduction between 80 and 90% can be achieved with this novel approach. With the successful integration of a 3-way catalyst into the new low-emission combustion technology a relevant technological milestone has been achieved. The application of an integrated 3-way catalyst provides a cost attractive alternative to conventional secondary measures and thereby contributes to a significant widening of the feedstock potential for heat and power production from biomass through the efficient reduction of NOx, which is a primary contributor to photochemical smog.

Keywords:

biomass combustion, catalyst, NOx emission

Topic:

Biomass Conversion for Bioenergy

Subtopic:

Advanced biomass combustion

Event:

31st European Biomass Conference and Exhibition

Session:

4CO.3.1

Pages:

614 - 627

ISBN:

978-88-89407-23-3

Paper DOI:

10.5071/31stEUBCE2023-4CO.3.1

Price:

FREE