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Keywords = oxydesulphurisation

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17 pages, 3851 KB  
Article
Development of a Temperature Programmed Identification Technique to Characterize the Organic Sulphur Functional Groups in Coal
by Moinuddin Ghauri, Khurram Shahzad, M. Shahzad Khurram, Mujtaba Hussain Jaffery, Najaf Ali, Waqar Ali Khan and Keith R. Cliffe
Energies 2017, 10(6), 782; https://doi.org/10.3390/en10060782 - 6 Jun 2017
Cited by 1 | Viewed by 3919
Abstract
The Temperature Programmed Reduction (TPR) technique is employed for the characterisation of various organic sulphur functional groups in coal. The TPR technique is modified into the Temperature Programmed Identification technique to investigate whether this method can detect various functional groups corresponding to their [...] Read more.
The Temperature Programmed Reduction (TPR) technique is employed for the characterisation of various organic sulphur functional groups in coal. The TPR technique is modified into the Temperature Programmed Identification technique to investigate whether this method can detect various functional groups corresponding to their reduction temperatures. Ollerton, Harworth, Silverdale, Prince of Wales coal and Mequinenza lignite were chosen for this study. High pressure oxydesulphurisation of the coal samples was also done. The characterization of various organic sulphur functional groups present in untreated and treated coal by the TPR method and later by the TPI method confirmed that these methods can identify the organic sulphur groups in coal and that the results based on total sulphur are comparable with those provided by standard analytical techniques. The analysis of the untreated and treated coal samples showed that the structural changes in the organic sulphur matrix due to a reaction can be determined. Full article
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15 pages, 6104 KB  
Article
High Pressure Oxydesulphurisation of Coal—Effect of Oxidizing Agent, Solvent, Shear and Agitator Configuration
by Moinuddin Ghauri, Khurram Shahzad, Abrar Inayat, Zulfiqar Ali, Waqar Ali Khan, Javaid Akhtar and Keith R. Cliffe
Energies 2016, 9(7), 505; https://doi.org/10.3390/en9070505 - 30 Jun 2016
Viewed by 4580
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 KMnO [...] Read more.
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. Full article
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14 pages, 5608 KB  
Article
High Pressure Oxydesulphurisation of Coal Using KMnO4—Effect of Coal Slurry Concentration, pH and Alkali
by Moinuddin Ghauri, Khurram Shahzad, Abrar Inayat, Zulfiqar Ali and Keith R. Cliffe
Energies 2016, 9(4), 289; https://doi.org/10.3390/en9040289 - 16 Apr 2016
Cited by 6 | Viewed by 6422
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, [...] Read more.
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. Full article
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14 pages, 511 KB  
Article
High Pressure Oxydesulphurisation of Coal—A Parametric Study
by Moinuddin Ghauri, Abrar Inayat, Muhammad Tariq Bashir, Salmiaton B. Ali and Keith R. Cliffe
Energies 2013, 6(4), 1930-1943; https://doi.org/10.3390/en6041930 - 3 Apr 2013
Cited by 2 | Viewed by 5412
Abstract
The current study is focused on controlling sulphur emissions by pre-treating coal to remove sulphur prior to combustion using the oxydesulphurisation technique. Three British coals were chosen for the study. Working with these coals gave a better insight to the oxydesulphurisation reactions for [...] Read more.
The current study is focused on controlling sulphur emissions by pre-treating coal to remove sulphur prior to combustion using the oxydesulphurisation technique. Three British coals were chosen for the study. Working with these coals gave a better insight to the oxydesulphurisation reactions for pyritic and organic sulphur. Effect of air and oxygen pressure in a fixed time interval on sulphur removal was studied by series of experimental runs at various temperatures. Heating value recoveries were significant. Increase in oxygen content is reported as a measure of carbon loss. The coal samples were analyzed according to British standard methods. Experimental results demonstrate that the sulphur removal was enhanced with the increase in air pressure, particularly up to 100 bars, with only a small decrease in calorific value at a particular temperature. Increasing temperature was witnessed to be more important in sulphur removal than increasing pressure. Full article
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