Loading...
Search for:
devolatilization
0.009 seconds
Behavior of three non-coking coals from Iranian's deposits in simulated thermal regime of tunnel kiln direct reduction of iron
, Article Journal of Analytical and Applied Pyrolysis ; 2016 ; 01652370 (ISSN) ; Askari, M ; Fabritius, T ; Sharif University of Technology
Elsevier B.V
2016
Abstract
The behavior of three types of non-coking coals from Iranian's deposits in thermal regime of tunnel kiln direct reduction of the iron (TKDRI) process has been investigated. The heating condition of raw materials in tunnel kiln was simulated in a vertical TGA for three different non-coking coals. For non-isothermal devolatilization of coals from room temperature to 1100. C, the heating rates of 1.5, 3 and 7. C/min were chosen. Coal mass and volumetric changes during devolatilization were observed by TGA and dilatometry analysis. XRD and scanning electron microscopy of raw coals and chars were used to analyze coal structural changes. In non-isothermal low heating rate pyrolysis of coal, most...
Thermogravimetric analysis and kinetic study of heavy oil pyrolysis
, Article Petroleum Science and Technology ; Volume 34, Issue 10 , 2016 , Pages 911-914 ; 10916466 (ISSN) ; Hami, M. R ; Sharif University of Technology
Taylor and Francis Inc
2016
Abstract
ABSTRACT: Pyrolysis, so-called devolatilization, is one of the first steps of all thermochemical processes occurring in an inert atmosphere. The authors discuss the main kinetic features of heavy oil pyrolysis, on the basis of the data derived m from a TGA analysis and by using a kinetic model. The samples were heated over a range of temperature from 400 K to 430°C at various heating rates between 10 and 80°C/min. Experimental results showed that the effect of time is considerable in the case of tar conversion, compared to char and gases
Behavior of three non-coking coals from Iranian's deposits in simulated thermal regime of tunnel kiln direct reduction of iron
, Article Journal of Analytical and Applied Pyrolysis ; Volume 123 , 2017 , Pages 395-401 ; 01652370 (ISSN) ; Askari, M ; Fabritius, T ; Sharif University of Technology
Elsevier B.V
2017
Abstract
The behavior of three types of non-coking coals from Iranian's deposits in thermal regime of tunnel kiln direct reduction of the iron (TKDRI) process has been investigated. The heating condition of raw materials in tunnel kiln was simulated in a vertical TGA for three different non-coking coals. For non-isothermal devolatilization of coals from room temperature to 1100 °C, the heating rates of 1.5, 3 and 7 °C/min were chosen. Coal mass and volumetric changes during devolatilization were observed by TGA and dilatometry analysis. XRD and scanning electron microscopy of raw coals and chars were used to analyze coal structural changes. In non-isothermal low heating rate pyrolysis of coal, most...
Investigation of Tabas anthracite coal devolatilization: Kinetics, char structure and major evolved species
, Article Thermochimica Acta ; Volume 654 , 2017 , Pages 74-80 ; 00406031 (ISSN) ; Askari, M ; Fabritius, T ; Sharif University of Technology
Elsevier B.V
2017
Abstract
The pyrolysis of low-volatile Tabas anthracite coal was investigated by thermogravimetric technique (TGA) in the temperature range from ambient to 1100 °C under non-isothermal heating conditions (1.5, 3, and 7 °C/min heating rates). Higher heating rates showed a small retarding effect on devolatilization toward higher temperatures. Iso-conversional method was used for the kinetic study of non-isothermal Thermogravimetric data. Activation energy calculated for coal conversion of 20–80% was about 319 kJ/mol which may be a result of stable ordered structure of this type of coal. Analysis of evolved gases by Fourier transform infrared spectrometry (FTIR) in 7 °C/min heating rate was conducted...