Methane gas emission during the spontaneous combustion of sub-bituminous C coal with different organic sulfur content in the temporary stockpile

Figures & data

Figure 1. Closed static chamber system for measuring methane gas emission.

Figure 2. Closed static chamber in the field.

Figure 3. GM 550 type infrared temperature.

Figure 4. Altair 4X multigas detector.

Table 1. Proximate and ultimate analysis of BB52LS and BB52HS coal.

Coals	TM	IM	ASH	VM	FC	TS	GCV
	% ar	% adb	% ar	% ar	% ar	% ar	% ar
BB52LS	30.50	15.70	3.40	33.98	32.12	0.51	5,051
BB52HS	27.10	12.60	5.86	34.06	32.98	0.91	5,099

TM = Total moisture; IM = inherent moisture; ASH = Ash content; VM = volatile moisture.

FC = Fixed carbon; TS = Total Sulfur; GCV = Gross caloric value.

Table 2. Composition of organic sulfur, pyrite, and sulfate of sub-bituminous C coal in the West Banko Mining Area.

Coal Sulfur	Sulfur Form (%)				Class
	ST	SO	SP	SS
BB52LS	0.51	0.48	0.02	0.01	Low sulfur
BB52HS	0.91	0.85	0.03	0.03	High sulfur

S_T = Total sulfur; S_O = Organic sulfur, S_P = Pyrite sulfur; S_S = Sulfate sulfur.

Figure 5. Relationship between temperature and organic sulfur content for the studied coals.

Figure 6. The heating temperature corresponds to time variation for BB52LS and BB52HS coals.

Figure 7. The formation of methane gas emission corresponds to temperature variation for BB52LS and BB52HS coals.

Figure 8. The formation of methane gas emissions corresponds to time variation for BB52LS and BB52HS coals.

Data availability statement

The data underlying this article are available in the article. If you cannot find it, contact the corresponding author.