Abstract
A high pressure oxydesulphurisation technique was investigated to reduce sulphur content, especially at ambient temperature. Prince of Wales coal was chosen for this study. The focus of the study was on the reduction of both pyritic and organic sulphur. The effects of pressure, coal slurry concentration, pH and KOH concentration in a fixed time interval on sulphur removal were studied with a series of experimental runs at ambient temperature. Heating value recovery was found to be increased with decreased pressure and with increased coal slurry concentration. It was found that sulphur removal was enhanced with an increase in pressure, with a more significant effect on the organic sulphur. With increase in the coal slurry concentration reduction, sulphur was found to be decreased.
Highlights
High sulphur and ash-forming mineral content make the use of coal challenging in thermochemical conversion processes like combustion, gasification, etc. [1,2]
The results of this study show that the effect of high pressure was quite pronounced on the sulphur on show the pyritic sulphur on the organic sulphur content asonwell
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%
Summary
High sulphur and ash-forming mineral content make the use of coal challenging in thermochemical conversion processes like combustion, gasification, etc. [1,2]. Sulphur in coal has been recognized as one of the major impurities in coal [3] and is present in different forms [4]. The presence of these forms of sulphur makes it necessary to install different flue gas scrubbing systems in power generation systems [5,6,7]. Development of a chemical coal cleaning process dealing with relatively low product loss operating at ambient temperature could minimize the energy requirements and degradation of the coal matrix, requiring lower capital and operating costs [12]
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