Modelling grate combustion of biomass and low rank fuels with CFD application

Mätzing, H.; Gehrmann, Hans‐Joachim; Seifert, Helmut; Stapf, Dieter

doi:10.1016/j.wasman.2018.05.008

Cited by 34 publications

(20 citation statements)

References 53 publications

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“…The char combustion stage was modeled using three reactions (reactions 6, 7 and 8): direct combustion with oxygen and two reactions respectively with CO2 and H2O. A similar approach was used by Mätzing et al [42] to model biomass combustion in fixed bed reactor with a slightly more detailed pyrolysis mechanism considering cellulose, hemicellulose and lignin devolatilization. However, approaches using global reactions cannot be an appropriate method to predict in details pollutant formation during biomass combustion in stoves or industrial systems for instance.…”

Section: Introductionmentioning

confidence: 99%

Development of a detailed kinetic model for the combustion of biomass

Dhahak

Bounaceur

Dreff-Lorimier

et al. 2019

Fuel

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In the context of the growing utilization of biomass to produce energy and of the related need to decrease pollutant emissions from domestic wood combustion devices, this paper presents a new kinetic model of wood combustion considering especially in details the gas-phase reactions related to the combustion of the tars produced by the biomass devolatization. The tar production is predicted using a semi-detailed mechanism of the literature. The tar gas-phase combustion model has been built as a compilation of literature mechanisms already proposed for these species, except for hydroxyacetaldehyde for which a new oxidation mechanism has been written. Experiments on the thermochemical behavior of three types of wood (beech, fir and oak) were also performed in parallel of this work using Thermogravimetric Analysis (TGA). The new detailed kinetic model of wood combustion, BioPOx (Biomass Pyrolysis and Oxidation), has been tested against a wide range of experimental results published in literature. This model fairly reproduces experimental results for pyrolysis and combustion of biomass and its constituents, key produced tars from biomass pyrolysis, and key compounds for Polycyclic Aromatic Hydrocarbons (PAH) formation, for a wide range of experimental devices and operating conditions.

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Section: Introductionmentioning

confidence: 99%

Development of a detailed kinetic model for the combustion of biomass

Dhahak

Bounaceur

Dreff-Lorimier

et al. 2019

Fuel

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“…Within this model, methane is a lump species which stands for all the non-tar hydrocarbons [50]. The kinetic data were obtained by manual fits to experimental DTG curves of several beech wood samples.…”

Section: Model-fitting Kinetic Methodsmentioning

confidence: 99%

Comparison of wood pyrolysis kinetic data derived from thermogravimetric experiments by model-fitting and model-free methods

Soria-Verdugo

Morgano²,

Mätzing

et al. 2020

Energy Conversion and Management

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“…Experimental and numerical results obtained at KLEAA, are the basis for the transfer to the technical-scale incinerator at POLZENITH. This method was already proofed for the combustion of municipal waste in KLEAA and a municipal waste incinerator [14].…”

Section: Experimental Approachmentioning

confidence: 97%

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

et al. 2021

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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.

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Modelling grate combustion of biomass and low rank fuels with CFD application

Cited by 34 publications

References 53 publications

Development of a detailed kinetic model for the combustion of biomass

Development of a detailed kinetic model for the combustion of biomass

Comparison of wood pyrolysis kinetic data derived from thermogravimetric experiments by model-fitting and model-free methods

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

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