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Experimental conditions and naming symbols.
| Variable indicators | Variable indicator values | Notation |
|---|---|---|
| Number of immersed days | Short-term (50 days) immersed coal | S |
| Long-term (200 days) immersed coal | L | |
| Air flow | 200 mL/min | q1 |
| 150 mL/min | q2 | |
| 100 mL/min | q3 | |
| 50 mL/min | q4 | |
| Oxidation process | Primary oxidation | 1 |
| Secondary oxidation | 2 |
