Thermogravimetric and mass-spectrometric analyses of combustion of spent potlining under N2/O2 and CO2/O2 atmospheres

Copyright © 2019 Elsevier Ltd. All rights reserved..

Thermal decomposition and gaseous evolution of the spent potlining (SPL) combustion were quantified using thermogravimetric and mass-spectrometric analyses in CO2/O2 and N2/O2 atmospheres using three heating rates (15, 20 and 25 °C/min). The thermal decomposition of SPL occurred mainly between 450 and 800 °C. Based on the four kinetic methods of Friedman, Starink, Kissinger-Akahira-Sunose and Flynn-Wall-Ozawa under the various conversion degrees (α) from 0.1 to 0.7, the lowest apparent activation energy was estimated at 149.81 kJ/mol in the 70% CO2/30% O2 atmosphere. The pre-exponential factor, and changes in entropy, enthalpy and free Gibbs energy were also estimated. The reaction model did not suggest a single reaction of the SPL combustion. With the α value of 0.25-0.7, the following function best described the reaction based on the Malek method: f(α) = 1/2α and G(α) = lnα2. The gases released during the combustion process included CO2, CO, NOx, HCN, and HF.

Medienart:

E-Artikel

Erscheinungsjahr:

2019

Erschienen:

2019

Enthalten in:

Zur Gesamtaufnahme - volume:87

Enthalten in:

Waste management (New York, N.Y.) - 87(2019) vom: 15. März, Seite 237-249

Sprache:

Englisch

Beteiligte Personen:

Sun, Guang [VerfasserIn]
Zhang, Gang [VerfasserIn]
Liu, Jingyong [VerfasserIn]
Xie, Wuming [VerfasserIn]
Kuo, Jiahong [VerfasserIn]
Lu, Xingwen [VerfasserIn]
Buyukada, Musa [VerfasserIn]
Evrendilek, Fatih [VerfasserIn]
Sun, Shuiyu [VerfasserIn]

Links:

Volltext

Themen:

142M471B3J
Carbon Dioxide
Journal Article
Oxy-fuel combustion
Spent potlining
TG-MS
Thermodynamic analysis

Anmerkungen:

Date Completed 12.09.2019

Date Revised 12.09.2019

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1016/j.wasman.2019.01.047

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM29727970X