Influence of Relative Humidity and Temperature on Grindability of
Pakistani and Afghani Coals authored
by Sumaira Kanwal*, Hafiza Sana, Shafqat Nawaz, Shahid Munir has been published on The Journal of Energy and Environmental Science.
Influence of Relative Humidity and Temperature on Grindability of Pakistani and Afghani Coals: Grindability of coal is a composite physical property which is generally measured by determining its Hardgrove Grindability Index (HGI). In the present study, the effect of change in total moisture content on as received and air dried basis of four different coals(from Pakistan and Afghanistan) on the HGI was studied. The results have shown that an increase in the total moisture content upto 8.11% on as received and air dried basis of coals, due to increase in the atmospheric relative humidity from 65% to 82%,reduce the HGI value up to 4.76 in the case of hard coals while it increased the HGI value up to11.85 in the case of soft coals. The magnitude of change in HGI with change in total moisture content after air drying of four coals under study was found to be somewhat similar. However, the magnitude of change in HGI with change in total moisture content on as received basis of a softer coal was found to be higher compared to that of harder coals. Countries like Pakistan have temperatures touching -2°C in winter and 47°C in summer. The relative humidity also changes from 60.2% to 80.5% during different weather conditions. Accordingly equilibrium moisture content of coal also changes with change in the relative humidity/atmospheric temperature. The purpose of the present research is to measure the impact of equilibrium moisture contentof Pakistani and Afghan coals under different relative humidity conditions on its HGI, which will be helpful for the calculation of specific energy requirement to mill the sample.
Ms. Sumaira Kanwal did her M.Sc. in Coal Technology from Centre
for Coal Technology, University of the Punjab in 2008 and secured Gold
Medal and M.Phil in Environmental Sciences in 2009 from College of Earth &
Environmental Sciences, University of the Punjab. She joined Centre for Coal
Technology in 2009 as Research Scholar and was later promoted as lecturer in
2011 base upon her exceptional performance. She is currently undertaking her
Ph.D studies. She has published 6 journal papers.
Ms. Hafiza Sana did her M.Sc. in Coal Technology in 2010 and M.Phil in Coal Technology in 2016 from Centre for Coal Technology, University of the Punjab. She joined Centre for Coal Technology in 2013 as Research Officer. She has published 3 journal papers. She has supervised 12 research thesis of M.Sc. Coal Technology students. and secured Gold Medal and M.Phil in Environmental Sciences in 2009 from College of Earth & Environmental Sciences,University of the Punjab. She joined Centre for Coal Technology in 2009 as Research Scholar and was later promoted as lecturer in 2011 base upon her exceptional performance. She is currently undertaking her Ph.D studies. She has published 6 journal papers.
Professor Dr. Shafqat Nawaz has been a renowned Professor of
Chemical Engineering in University of the Punjab for the last four decades. He
completed his Ph.D in 1973 from University of Leeds, UK. He has worked as
Director, Institute of Chemical Engineering & Technology and Centre for
Coal Technology in University of the Punjab. He has published 35 research
papers.
Prof. Dr. Shahid Muniris the leading scientist in the discipline
of Energy and Environmental Engineering in Pakistan who has 23 years of
industrial, teaching and research experience. He is currently serving
University of the Punjab as Professor in Chemical Engineering and Director in
Centre for Coal Technology. He did his Ph.D in chemical Engineering from
University of Leeds, UK. He has published 27 research papers.
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