Heat Altered Coal and Its Use in Metallurgical Coke Making

Nag, Debjani; Banerjee, P. K.; Haldar, S. K.

doi:10.2355/isijinternational.51.1194

Cited by 3 publications

(2 citation statements)

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“…This intrusion causes dramatic changes in vitrinite reflectance, mineralogy and geochemistry of the coal seams which affects the physical, chemical and microscopic properties (Onifade et al 2019). Following intrusion, a major change in the evacuation of volatile matter (VM) is observed that results in deposition of carbonaceous matter which is the reason heat affected coal has been generally observed to show an increase in ash and fixed carbon (Nag et al 2011). Macroscopical observation revealed that Jhama coal is dull, hard and compact with its pores either empty or filled with mineral matter (Nag et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Having quite difficult washability characteristics due to uniform distribution of mineral matters in the partially carbonized coal matrix, its large scale application in coke making is a challenging issue (Chakladar et al 2020). It was reported that Jhama coal had to undergo certain coal preparation practise to improve its quality as blend (Nag et al 2009(Nag et al , 2011. Total reserves of Jhama coal, in the Jharia coalfield alone currently stands at 5313 Mt.…”

Section: Introductionmentioning

confidence: 99%

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Combustion characteristics of high ash Indian thermal, heat affected coal and their blends

Aich

Nandi

Bhattacharya

2021

Int J Coal Sci Technol

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Onsite mine fire generates large volumes of heat-affected coal in Jharia coalfields, India. Direct utilization of such heat-affected coal in thermal utilities is not feasible as such coal does not have the desirable volatile matter required for combustion. In the present work, experimental studies have been carried out to investigate the possible utilization of such heat-affected coal in thermal utilities by blending with other coal. Heat-affected coal (31% ash and 5300 kcal/kg GCV) collected from Jharia coalfield were blended with thermal coal (28% ash and 5650 kcal/kg GCV) in different ratios of 90:10, 80:20, 70:30 and 60:40 to identify the desirable blend ratio for burning of blended coal in thermal utilities. Burning characteristics of all the coals were carried out using TGA. Various combustion parameters such as ignition temperature, peak temperature, burnout temperature, ignition index, burnout index, combustion performance index, rate and heat intensity index of the combustion process and activation energy were evaluated to analyse the combustion process. Experimental and theoretical analysis shows the blend ratio of 90:10 can be used in place of only thermal coal in utilities to reduce the fuel cost.

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Section: Introductionmentioning

confidence: 99%