High Pressure Oxydesulphurisation of Coal—A Parametric Study

Moinuddin Ghauri,Muhammad Bashir,Salmiaton Ali,Keith Cliffe,Abrar Inayat

doi:10.3390/en6041930

Moinuddin Ghauri, Muhammad Bashir + Show 3 more

Open Access

https://doi.org/10.3390/en6041930

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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 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.

Highlights

Presence of impurities like sulphur and ash-forming minerals in coal affect its properties and detract from its value for most applications, including combustion, metallurgical processes, synthesis fuels etc. [1,2]
A possible disadvantage is that the combustion properties can be modified, due to the decrease in calorific value which is a result of the increase in the oxygen content, behavior of ash content and loss of organic matrix of the treated coal
Effect of Air Pressure on Sulphur Removal. These reactions were performed on Prince of Wales (A), Silverdale and Harworth coal samples

Summary

Introduction

Presence of impurities like sulphur and ash-forming minerals in coal affect its properties and detract from its value for most applications, including combustion, metallurgical processes, synthesis fuels etc. [1,2]. Presence of impurities like sulphur and ash-forming minerals in coal affect its properties and detract from its value for most applications, including combustion, metallurgical processes, synthesis fuels etc. Convenient methods of controlling sulphur issues in line with the current emission legislation and the other coal application processes make chemical coal cleaning inevitable over and above physical cleaning methods [4,8,9]. Another advantage of chemical coal cleaning is that it reduces the mineral matter and trace elements. A possible disadvantage is that the combustion properties can be modified, due to the decrease in calorific value which is a result of the increase in the oxygen content, behavior of ash content and loss of organic matrix of the treated coal

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Conclusion