TU Darmstadt / ULB / TUbiblio

Systematic evaluation and kinetic modeling of low heating rate sulfur release in various atmospheres

Debiagi, P. and Yildiz, Coskun and Ströhle, Jochen and Epple, Bernd and Faravelli, T. and Hasse, C. (2021):
Systematic evaluation and kinetic modeling of low heating rate sulfur release in various atmospheres.
In: Fuel, 289, p. 119739. ISSN 0016-2361,
DOI: 10.1016/j.fuel.2020.119739,
[Article]

Abstract

In the present work, a systematic experimental and numerical study of sulfur release from coal in varying atmospheres at low heating rates (LHR) is presented. To this aim, two bituminous coals were investigated, Colombian hard coal (K1) with typical sulfur content, and American high-sulfur coal (U2), with elevated sulfur content. Mass loss and release of target volatile species - H2S, COS, SO2- were tracked using a TG-MS. The samples were heated at 10 Kmin−1under different atmospheres: argon, CO2, synthetic air (21 vol O2/79 vol Ar) and oxy-fuel (21 vol O2/79 vol CO2). The role of the different atmospheres in the sulfur release was elucidated as well as the fate of the volatile species in the gas-phase. The advantage of investigating the release at LHR is that heat and mass transfer effects can be neglected, as the experimental conditions allow the process to remain in the kinetic regime. The successive increase in atmosphere complexity allowed to individuate the chemical paths leading to the formation of SOXand its precursors in each of the conversion steps: devolatilization, char conversion as well as the coupling to gas-phase reactions. The experiments were further analyzed with a kinetic model for the solid-phase of coal conversion, coupled with a detailed gas-phase kinetic mechanism. The solid-phase kinetic model was modifiedaccounting for the particularities of the fuels, for the effects of oxy-fuel atmosphere. A small number of kinetic parameters was adjusted for improved predictions of the release rate and the yields of sulfur species.

Item Type: Article
Erschienen: 2021
Creators: Debiagi, P. and Yildiz, Coskun and Ströhle, Jochen and Epple, Bernd and Faravelli, T. and Hasse, C.
Title: Systematic evaluation and kinetic modeling of low heating rate sulfur release in various atmospheres
Language: English
Abstract:

In the present work, a systematic experimental and numerical study of sulfur release from coal in varying atmospheres at low heating rates (LHR) is presented. To this aim, two bituminous coals were investigated, Colombian hard coal (K1) with typical sulfur content, and American high-sulfur coal (U2), with elevated sulfur content. Mass loss and release of target volatile species - H2S, COS, SO2- were tracked using a TG-MS. The samples were heated at 10 Kmin−1under different atmospheres: argon, CO2, synthetic air (21 vol O2/79 vol Ar) and oxy-fuel (21 vol O2/79 vol CO2). The role of the different atmospheres in the sulfur release was elucidated as well as the fate of the volatile species in the gas-phase. The advantage of investigating the release at LHR is that heat and mass transfer effects can be neglected, as the experimental conditions allow the process to remain in the kinetic regime. The successive increase in atmosphere complexity allowed to individuate the chemical paths leading to the formation of SOXand its precursors in each of the conversion steps: devolatilization, char conversion as well as the coupling to gas-phase reactions. The experiments were further analyzed with a kinetic model for the solid-phase of coal conversion, coupled with a detailed gas-phase kinetic mechanism. The solid-phase kinetic model was modifiedaccounting for the particularities of the fuels, for the effects of oxy-fuel atmosphere. A small number of kinetic parameters was adjusted for improved predictions of the release rate and the yields of sulfur species.

Journal or Publication Title: Fuel
Journal volume: 289
Uncontrolled Keywords: Kinetic modeling, Coal, Pollutants, Sulfur, SO
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
Date Deposited: 29 Dec 2020 06:24
DOI: 10.1016/j.fuel.2020.119739
Official URL: http://www.sciencedirect.com/science/article/pii/S0016236120...
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details