A brief description is given of devolatilization of raw coal and combustion of the residual char. Major achievements in the study of devolatilization and important areas for further experimentation are noted; however, attention is focussed on the rate processes involved in char combustion. Means of calculating reaction rates are shown which account for temperatures of particles, mass transfer a...

In this study, a circulating fluidized bed (CFB) of 125 mm diameter and 1800mm height was used to find the combustion characteristics of sewage sludge (SS) produced in Turkey. Sludge + olive cake, and sludge + lignite coal mixtures were burned separately. Various sludge-to-lignite coal and sludge-to-olive cake ratios (5/95, 10/90, 15/85, 20/80) were tried. On-line concentrations of major compon...

tabas mines in iran have coal sources which are suitable for use in metallurgy industries as coking coal. but the high sulfur content of this coal imposes severe limitations on its utilization as the sulfur oxide gases evolved from the combustion of high sulfur coals result in acid rains and corrosion of equipments. in this work, attempts have been made to reduce sulfur from high sulfur coal of...

In relation to future energy demand and fossil fuel crisis particularly in India, biomass is gaining its importance for possible utilization as co-fuel. This study focuses the use of „low temperature biomass char‟ instead of raw biomass in the blends to extract some specific advantages like lowering of grinding energy, intensification of heat energy, proper adjustment of „VM and fuel ratio‟ etc...

The inspiration for this research was the numerical simulation of mass loss of char particles during its combustion in a CFB boiler. The mass loss was presented as the superposition of two separate processes i.e. combustion and surface erosion. The values obtained by the model and experimental data show a good level of conformity. INTODUCTION Until now many authors have attempted numerical simu...

Spontaneous combustion of coal remains an important problem for mines, which can lead to explosion methane and dust. Accidents associated with spontaneous cause significant economic losses mining companies, as well entail social damage – injuries loss life. are known at the Kuzbass occurred a result negligent attitude danger coal, victims were dozens people. The analysis emergency situations sh...

Abstract Coal spontaneous combustion (CSC) is a disaster associated with coal mining that leads to loss of resources and environmental human health issues. To investigate kinetic characteristics for oxidation coal, three samples were collected from different areas in the Southern Junggar coalfield. Subsequently, ground into particle sizes tested using microscopic macroscopic methods, including ...