Oscillating Combustion—Primary Measure to Reduce Nitrogen Oxide in a Grate Furnace−Experiments and Simulations

Hans-Joachim Gehrmann; Bo Jaeger; Siegmar Wirtz; Viktor Scherer; Krasimir Aleksandrov; Manuela Hauser; Dieter Stapf; Gregor Pollmeier; Philipp Danz

LAPSE:2023.4267

Published Article

LAPSE:2023.4267

Oscillating Combustion—Primary Measure to Reduce Nitrogen Oxide in a Grate Furnace−Experiments and Simulations

Hans-Joachim Gehrmann, Bo Jaeger, Siegmar Wirtz, Viktor Scherer, Krasimir Aleksandrov, Manuela Hauser, Dieter Stapf, Gregor Pollmeier, Philipp Danz

February 22, 2023

Abstract
The emission from industries and the mobility sector is under strong legal regulations in many countries worldwide. In Germany, the amendment to the 17th BlmSchV (Federal pollution control ordinance), which has been in force for waste incineration plants since 2013, has given rise to a new limit for nitrogen oxides of 150 mg/m3 as the daily mean level from 2019 on. A similar focus is on biomass-fired plants. According to the MCP (medium combustion plant) guideline of the EU, as a consequence, existing plants are required to either increase their consumption of ammonia water for nitrogen oxide reduction (SNCR process) or back fit SCR catalysts as secondary measures, which is a costly procedure. This paper presents a novel two-stage process in which an oscillating supply of secondary air allows nitrogen oxides to be reduced by approx. 50% at a good burnout level, which may obviate the need for secondary measures. Besides experimental investigations in a fixed bed reactor, CFD simulations confirm a high potential for reduction of nitrogen oxides. Together with the company POLZENITH, this process is under development for scale-up in a biomass incineration plant as a next step.

Record ID

LAPSE:2023.4267

Keywords

CFD-simulation, combustion, grate furnace, oscillation, reduction of NOx

Subject

Modelling and Simulations

Suggested Citation

Gehrmann HJ, Jaeger B, Wirtz S, Scherer V, Aleksandrov K, Hauser M, Stapf D, Pollmeier G, Danz P. Oscillating Combustion—Primary Measure to Reduce Nitrogen Oxide in a Grate Furnace−Experiments and Simulations. (2023). LAPSE:2023.4267

Author Affiliations

Gehrmann HJ: Institute for Technical Chemistry (ITC), Karlsruhe Institute for Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany [ORCID]
Jaeger B: Lehrstuhl für Energieanlagen und Energieprozesstechnik (LEAT), Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany
Wirtz S: Lehrstuhl für Energieanlagen und Energieprozesstechnik (LEAT), Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany
Scherer V: Lehrstuhl für Energieanlagen und Energieprozesstechnik (LEAT), Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany
Aleksandrov K: Institute for Technical Chemistry (ITC), Karlsruhe Institute for Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Hauser M: Institute for Technical Chemistry (ITC), Karlsruhe Institute for Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Stapf D: Institute for Technical Chemistry (ITC), Karlsruhe Institute for Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany [ORCID]
Pollmeier G: POLZENITH GmbH & Co. KG, An der Heller 22, 33758 Schloß Holte-Stukenbrock, Germany
Danz P: b&d Energie-und Umwelttechnik GmbH, Otto-Schott-Str. 5, 99427 Weimar, Germany

Journal Name

Processes

Volume

9

Issue

12

First Page

2210

Year

2021

Publication Date

2021-12-08