Abstract:

In order to improve the safety management level of ginned cotton warehouses and prevent fire accidents,  the combustion behavior and difference of packaged ginned cotton with  different densities under fifferent radiant heat fluxes were studied systematically by cone calorimeter, and the isohermal  thermo weightlessness of ginned cotton at different temperatures was analyzed by means of thermo gravimetric analyzer. The results show that the combustion state of ginned cotton has a great relationship with density, heat fluxes and fire source. When the fire flux is greater than 15kW/m2, the relatively dense ginned cotton generates an open flame after it is ignited by the fire source and is in smoldering when it is not ignited. When ignition occurs, with the heat flux improved gradually from 10 kW/m2 to 35kW/m2，the combustion state of relatively loose ginned cotton would change accordingly. When the radiation intensity reaches 35 kW/m2, the ignition time of the ginned cotton samples with different densities is about 7 s, which is highly inflammable. The ginned cotton can be completely decomposed when being exposed to heat flux above 15 kW/m2 over an extended period of time.

Key words: ginned cotton, radiation intensity, burning characteristic, cone calorimeter