Abstract
The ambient temperature high pressure oxydesulphurisation technique was investigated to reduce the sulphur content. Prince of Wales coal was chosen for this study. The focus of the study was to investigate the reduction of both pyritic and organic sulphur while changing the KMnO4/Coal ratio, agitation speed, agitator configuration, and shear. The effect of different concentrations of acetone as a solvent and effect of particle size on the sulphur removal was also studied by a series of experimental runs at ambient temperature. Heating value recovery was found to be increased with the decreased KMnO4/Coal ratio and with decreased acetone concentration. It was found that sulphur removal was enhanced with the increase in shear using a turbine impeller. The effect of particle size was more significant on the pyritic sulphur removal as compared to the organic sulphur removal while heating value recovery was found to increase with decreased desulphurization tome for both, under atmospheric and high pressure.
Highlights
Concerning coal based power generation, sulphur present in coal has been considered as one of the major impurities in coal [1] that demands installation of different flue gas scrubbing systems in the power generation power plants [2,3,4,5]
Using pressure up to 50 bar in the case of potassium permanganate oxidation had a significant effect on the removal of organic sulphur from Prince of Wales coal from 24% to 40%
Increase in the potassium permanganate/coal ratio showed an increase in sulphur removal
Summary
Concerning coal based power generation, sulphur present in coal has been considered as one of the major impurities in coal [1] that demands installation of different flue gas scrubbing systems in the power generation power plants [2,3,4,5]. Sulphur present in coal has different forms but is mainly categorized as pyritic and organic sulphur [6]. Within the pre-combustion cleaning techniques, chemical coal cleaning has its dominance over other techniques because of its significant reduction of sulphur present in the coal matrix along with the reduction in trace elements [6,9,10]. Development of a chemical coal cleaning process having a high product yield operating at ambient temperature is detrimental to minimizing the energy requirements and degradation of the coal matrix. Oxydesulphurisation processes can effectively convert the sulphur into the form of soluble sulphates [15]. Oxydesulphurisation research has involved mainly high temperature reactions. Different researchers have investigated the chemical desulphurization using different oxidizing agents [17,18,19] under different pH conditions [20]
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