| The pyrolysis and combustion characteristics of dry-style combustibles, have not been recognited yet. Under such practical fire situation, this paper took two representative dry-style combustibles: aniseed and agaric as study objects. A series of experimental and numerical researches were carried out, focusing on their pyrolysis and combustion characteristics.The pyrolysis characteristics were studied from microcosmic pointview. Firstly, TG analysis were done under 4 temperature rising rate, kinetic parameters were calculated, thermal stability were determinated. At the same time, the effects of moisture content were also studied. Secondly, HeadSpace -gas chromatography/mass spectrometry method was used to study TVOCs of the materials under 110°C, the influence of headspace temperature, sample figures, moisture content were considered. Afterward, Pyrolysis - GC/MS was used to study the thermal decomposition of the materials, the influence of sample position, pyrolysis temperature, moisture content, and combustion factors were considered.The combustion characteristics were studied from macroscopical pointview. Two most common ignition manners, external radiation and internal heat, were used to ignite the material. For external radiation ignition manner, a series of small-scale fire tests were conducted in a cone calorimeter in accordance with ISO 5660. Ignition time, heat release rate, mass loss rate and smoke density were measured, evaluating their fire performance by comparing EHC and SEA with common combustibles. At the same time, a PDE model including the effect of moisture was set up, and expand phenomena was considered for agaric. For internal heat ignition manner, a fire test was carried out in an ISO 9705 ROOM. Multi-parameters, such as heat release rate, mass loss rate, temperature field and species concentration, were measured. The quantitative relations were developed between heat release rate and other parameters. The experiment process was numerical simulated. |
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