Last modified: 2017-10-10
Abstract
The coal which remains in powder form after its excavation and transportation does not fulfill the requirements of industries and cause great losses of resources. The coal in powder form can be recycled by the production of coal briquettes, which ultimately will save our coal resources and will make our environment clean. The coal fines are blended with binder and then heated along with pressing for the formation of briquettes. The dukki coal, Makarwal and surenj coal was blended in different ratios with starch based indian binder and molasses. A proximate analysis, ultimate and thermogravimetric analysis has been done to find out the properties of briquettes. The strength of the briquettes has also been measured by using compression machine. The results clearly shows that the briquettes formed with coal from Dukki alongwith Starch based Indian binder had the best gross calorific value of 6.378 Kcal/gm. The least GCV value of 4.641 Kcal/gm was obtained by using briquettes of Makarwal and Indian binder. The coal from Surenj gave steady values of GCV. However, Dukki coal + Indian binder gave highest GCV but the sulfur content present in it is 2.4% which is slightly higher as compared to Surenj coal with Molasses binder. Higher %age of sulfur in the coal would generate SOx gases that might deviate from the EPA standard. Ideally, the sulfur content should be as less as possible, as it may require a separate Desulfurization unit which will be expensive to install and operate. The GCV of Sorenj coal with Molasses is also slightly less than Dukki Coal + Indian Binder. So it may prove to be a better option as compared to Dukki Coal.