The Effect of Pore Volume of Hard Coals on Their Susceptibility to Spontaneous Combustion

Table 2

The values of spontaneous combustion indexes and the activation energy for individual coal samples with the corresponding group of spontaneous combustion.

Samples	Spontaneous combustion index; Sz^a  (K/min)^a	Spontaneous combustion index; Sz^a′  (K/min)	Activation energy of coal oxidation 𝐴; (kJ/mol)	Group of spontaneous combustion
Rydułtowy s. 703/1	12	4	46	II
Marcel s. 712/1-2	13	3	62	II
Borynia s. 415	46	8	73	I
Chwałowice s. 405	46	7	79	I
Zofiówka s. 407	55	11	68	I
Marcel s. 507	57	12	65	II
Bielszowice s. 405/2	71	17	60	II
Jankowice s. 405	84	32	40	IV
Śląsk s. 510	91	39	36	IV
Sośnica s. 413	92	31	46	III
Szczygłowice s. 405	92	32	44	III
Polska-Wirek s. 510	91	40	35	IV
Staszic s. 402	94	34	43	III
Wesoła s. 501B	102	32	49	IV
Piast s. 209	103	46	34	V
Mysłowice s. 501	104	45	35	IV
Piast s. 206	105	48	33	V
Sobieski s. 209	150	63	36	V