| | Clustering | Feature item | Main accident causes |
| | 0 | Maintenance, violation, blind plate, nonstandard, protective measures, fire, smoke, disassembly, cleaning, safety rope, slip, fall, high temperature, scald, crush, respirator, and fainting | Lack of safety awareness, failure to take protective measures, nonstandard operation, misoperation, and untimely communication | | 1 | Induced draft fan, motor, circuit board, bearing, compressor, switch, damage, fault, over temperature, burn out, trip, shutdown | Equipment failure, induced draft fan parts damage, motor damage, compressor parts damage, over temperature, and switch trip | | 2 | Low temperature and high temperature economizer, flange, boiler, pipeline, water wall, leakage, rupture, leakage point, water level, rise, furnace, pressure, shutdown, and maintenance | Economizer leakage, pipeline rupture, water wall rupture, flange leakage, and pipeline blockage | | 3 | Coke oven gas, flow, parameters, alarm, temperature, vibration, water level, abnormality, pressure, liquid level, low and rise fluctuation, interlocking, overrun, and too high and too fast shutdown | The gas flow/liquid level/pressure/temperature fluctuates wildly, and the vibration amplitude is too large | | 4 | Angle valve, pulverized coal, gasifier, quench chamber, blockage, sundries, material accumulation, trip, and shutdown | Sundries are not cleaned on time | | 5 | Carelessness, vehicle, collision, knockdown, fracture, bus, and injury | Lack of safety awareness and failure to comply with traffic rules |
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