Coal-quality deterioration in a coal stack of a power station

Banerjee, Debargha; Hirani, M; Sanyal, S.K.

doi:10.1016/s0306-2619(99)00127-0

Cited by 8 publications

(10 citation statements)

References 8 publications

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“…In the months of March-April nominal difference can be observed in morning versus evening samples. The trend observed is in agreement with a previous study carried out for a high rank coal from North Karanpura coalfield of India over a period of 8 months (Banerjee et al 2000).…”

Section: Methodssupporting

confidence: 92%

“…Initial increase in volatile content results due to adsorption of oxygen from the atmosphere. Subsequent erratic, but gradual decrease till 1st June 2016 to the level of 22% is possibly due to oxidation at low temperature with release of combustion products (Banerjee et al 2000;Leonard 1977;Kus and Kennan 2017;Jose et al 1996) and natural decomposition of various hydrocarbons as described in Sect. 3.1.…”

Section: Effect Of Weathering On Proximate Analysis Of Coalmentioning

confidence: 98%

“…Therefore, it can be stated that, weathering of coal largely affects the coal properties by changing the surface properties, chemical bonding between C, H, O and other elements present in coal that largely affects the coal properties. In the only major published work on Indian coal, Banerjee et al (2000) reported coal-quality deterioration in a coal stockpile of a utility. In their study, they showed that significant amount of GCV was lost during storage.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the previous work reported the structural changes C-C and C-H bond, changes in caking properties, petrographic compositions, coke properties (Banerjee et al 2000;Xia and Yang 2014;Cimadevilla et al 2005;Smędowski and Piechaczek 2016;Tamamura et al 2015;Kříbek et al 2017) etc. in weathered coal.…”

Section: Introductionmentioning

confidence: 99%

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Effect of weathering on physico-chemical properties and combustion behavior of an Indian thermal coal

Aich

Nandi

Bhattacharya

2018

Int J Coal Sci Technol

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An open air stockpile of conical shape was formed with 3.5 m base diameter and 5 m height using 500 tons of-200 mm size ROM thermal coal on a concrete floor. Coal sample from the stockpile were collected at 30 days interval for analysis of various chemical properties like; proximate analysis, ultimate analysis, gross calorific value (GCV) and various combustion related properties such as ignition temperature, peak temperature, burnout temperature, maximum combustion rate, ignition index, burnout index, combustion performance index and combustion rate intensity index. Experimental results show that, due to weathering of coal fixed carbon decreased from 35.6% to 19.9%, elemental carbon (C) decreased from 46.6% to 28.6%, hydrogen (H) decreased from 3.3% to 2.9% and GCV decreased by up to 55% of original value during 330 days of storage of coal in an open atmosphere. Ash content of coal increased form 29.2% to 46.6% due to loss of combustibles. Sulfur (S) of coal was found to get increased from 0.33% to 1.08% during storage. The activation energy of coal combustion increased from 22 kJ/mol to 54 kJ/mol. Variation in combustion parameters signifies that weathering has significant negative impact on coal combustion properties as coal become difficult to ignite.

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Section: Methodssupporting

confidence: 92%

Section: Effect Of Weathering On Proximate Analysis Of Coalmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of weathering on physico-chemical properties and combustion behavior of an Indian thermal coal

Aich

Nandi

Bhattacharya

2018

Int J Coal Sci Technol

View full text Add to dashboard Cite

show abstract

“…During this process, the oxygen content in the organic matter increases (van Krevelen, 1993), while the carbon and the hydrogen contents decrease (Tekely et al, 1987). Plasticity, calorific values, and coking ability also decrease (Banerjee et al, 2000;Machnikowska et al, 2003). Organic matter oxidation also leads to an increase in carboxylic groups and to changes in the proportions of different bitumen fractions (Martinez and Escobar, 1995).…”

Section: Introductionmentioning

confidence: 99%