Mathematical Model of Maximum Commutation Half Cycle for Thermal Countercurrent Oxidation of Low-Concentration Gas in Coal Mine Ventilation

Table 3

Comparison of experimental and calculated values of the maximum commutation half cycle.

Working condition number	Methane concentration (%)	Inlet velocity (m/s)	Porosity	Filling length (m)	Measured value (min)	Calculated value before correction (min)	Error before correction (%)	Calculated value after correction (min)	Error after correction (%)
1	0.30	0.20	0.56	1.20	23.17	27.77	16.58	22.77	1.73
2	0.60	0.30	0.70	1.20	14.33	17.83	19.60	14.62	1.96
3	0.40	0.30	0.56	0.80	11.50	14.38	20.00	11.79	2.44
4	0.50	0.25	0.70	0.80	10.33	12.86	19.67	10.55	2.04
5	0.70	0.35	0.70	1.20	13.33	16.67	20.04	13.67	2.49
6	0.30	0.20	0.36	1.2	36.51	43.36	15.79	35.55	2.69
7	0.60	0.30	0.4	1.2	34.27	40.65	15.69	33.33	2.82
8	0.40	0.30	0.36	0.8	18.51	22.44	17.53	18.40	0.57
9	0.50	0.25	0.4	0.8	23.73	29.33	19.09	24.05	1.33
10	0.70	0.35	0.4	1.2	31.82	38.02	16.30	31.17	2.07