Study On Combustion Characteristics Of Different Bulk Density Paper-tapes

Fire hazard is one of the most common and greatest disasters to personal and property. Studies on the phenomenon and inherent law of fire development have been one of most hot topics in fire science. The essential parameter that quantitatively describes the severity of a fire is the heat release rate (HRR). Predicting the heat release rate is widely used in fire protection design. Phenomenon and characteristic parameters of fire development under different circumstances differed from each other. In this article, the effects of solid fuels of different bulk density on the fire behaviors are studied.Fire hazard occurred randomly and unexpectedly, so it is very difficult to measure how big the fire is in real cases. One current way is studying on the small size of the sample fire test to predict some features of the full-size fuel combustion parameters such as heat release rate, mass loss rate, etc. In order to study the effect of different bulk density on solid fuel, shredded paper-tapes fires of different sizes, and different bulk densities were carried out in a heat release rate test room.9 different cases were designed and each case was repeated 3 times. After a comparative analysis of the combustion process, some results were concluded:1) While the paper-tapes bulk density increases, the combustion process is more inadequate, the flame goes out after the bottom of the paper covered with loading residue, unburned paper-tapes is significantly increased; meanwhile, while the height of the flame is reduced, the effective heat of combustion per unit mass is also significantly reduced, lower combustion efficiency. Experiments the effective heat of combustion heat of the bulk density of 22.2 kg/m3 case is only 80% of the bulk density of 7.4 kg/m3.2) As the bulk density increases, its classification of fire development in line with the t squared fire growth model is different from the rapid growth of the fire gradually becomes slow fire growth model:the same volume of paper-tapes, if increases weight, then the burning time increases and the peak heat release rate decrease; the same weight of paper-tapes, if reduces the volume, then the burning time increases and the peak heat release rate decreases. The relation between bulk density and the burning density is nearly to α=488/ρ4.The pyrolysis area is also analyzed from the geometric point of view in this article. A heat release prediction models established based on the case of 7.4 kg/m3 in paper-tapes bulk density and the predicted results agree well with the measured data. The model can predict the development of fire under certain circumstances. However, the prediction model cannot address the impact of factors such as the collapse of the fuel during combustion, It is only a preliminary model that needs for further research.