In order to evaluate the risk of the cumulate wood dust, the dust layers test system to research the influence of the heated plate temperature and thickness to the minimum ignition temperature of wood dust layers was used.The results show that: under the effect of heated surface, the higher the heating temperature, the easier the combustion of the wood dust layers.And when the bulking thickness is 15 mm, the minimum ignition temperature of the wood power layer is 290 ℃.The minimum temperature of wood dust layers increases with the height of metal ring and when the metal ring height ≥15 mm, minimum ignition temperature of the wood dust layers remains unchanged.%为了评价堆积状态下木粉的危险性,利用粉尘层最低着火温度测试装置,研究加热板温度,以及堆积厚度对木粉尘层最低着火温度的影响.测试结果表明:热表面作用下,加热板温度越高木粉层越容易发生燃烧,得到堆积厚度为15 mm时的木粉最低着火温度为290 ℃.木粉尘层最低着火温度随堆积厚度的增大而降低,当金属环高度≥15 mm时,木粉尘层最低着火温度保持不变.
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