Combustion behavior of KOH desulphurized coals assessed by TGA-DTG. Issue 20 (18th October 2018)

• Record Type: Journal Article
• Authors: Ken, Bhupendra Singh; Aich, Subhajit; Saxena, V. K.; Nandi, Barun Kumar
• Is Part Of: Energy sources. Volume 40:Issue 20(2018)
• Page Start: 2458
• Page End: 2466
• Publication Date: 2018-10-18
• Subjects: Activation energy -- burning profile -- C-R method -- desulphurization -- TG-DTG; Natural resources -- Periodicals; Energy consumption -- Periodicals; Energy consumption -- Climatic factors -- Periodicals; Energy conversion -- Periodicals; Energy conversion -- Environment aspects -- Periodicals; Power (Mechanics) -- Periodicals; 333.7905
• DOI: 10.1080/15567036.2018.1502844
• Languages: English
• ISSNs: 1556-7036

Abstract

ABSTRACT: This work presents the results obtained from the experimental study on the effects of KOH treatment and its combustion behavior of high sulfur Indian coal. Coal was treated with 5–20% KOH (v/v) concentration for 6–24 h reaction time to identify the effects of KOH treatment on coal properties. Experimental results showed that upto 36.79% of total sulfur can be removed from coal with 20% KOH concentration and 24 h contact time at atmospheric condition. However, gross calorific value of coal decreased from 6800 to 6084 kcal/kg due to removal of combustibles from coal. Combustion characteristics of treated coal were assessed by Thermo-gravimetric analysis/ Differential thermo-gravimetric (TGA/DTG analysis). Further various combustion kinetic parameters like ignition temperature, peak temperature, burnout temperature, activation energy (E), and pre-exponential factor (A) are estimated. Experimental results show that the ignition temperature of coal decreased from 321°C to 252°C, peak temperature decreased from 459°C to 409°C due to changes in the coal matrix after desulfurization. The activation energy of coal calculated decreased from 79 to 45 kJ/mol due to desulfurization using 20% KOH concentration and 24 h reaction time.