A thermogravimetric method for the measurement of CO/CO2 ratio at the surface of carbon during combustion


Type
Article
Change log
Authors
Marek, E 
Dennis, JS 
Scott, SA 
Abstract

This work presents a new method of measuring the CO/CO2 ratio at the surface of carbon particles during combustion. This thermogravimetric method deduces the ratio of CO to CO2 by comparing the rate of consumption of carbon with the rate of oxidation of an external reference material with fast oxidation kinetics, in this case Cu. The method is useful when combustion is controlled by external mass transfer, commonly encountered in large-scale processes. The viability of this method has been demonstrated experimentally with graphite and a lignite char. It was found that in an atmosphere of ~ 1% O2, the graphite produced CO2 between 700 and 900 °C whilst the lignite char produced a mixture of CO and CO2 between 700 and 800 °C with the proportion of CO increasing with temperature, and above 850 °C, only CO was produced. It was also found that for this particular lignite char, the ratio of CO/CO2 increased with decreasing pO2 in the environment.

Description
Keywords
CO/CO(2 )ratio, Mass transfer, Combustion, Coal char, Thermogravimetry
Journal Title
Proceedings of the Combustion Institute
Conference Name
Journal ISSN
1540-7489
1873-2704
Volume Title
37
Publisher
Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/I010912/1)
Engineering and Physical Sciences Research Council (EP/K030132/1)
Engineering and Physical Sciences Research Council (EP/L022427/1)