摘要：利用粉尘云引燃温度装置和粉尘层引燃温度装置, 对5种不同粒径的球形钛粉的最小引燃温度 (T_min) 进行试验研究;拟合钛粉尘云最小引燃温度 (T_{c, min}) 和粉尘层最小引燃温度 (T_{l, min}) 关于粒径的函数, 以及钛粉尘云引燃温度 (T_c) 关于质量浓度的函数。结果表明:喷尘压力的增大对钛粉尘云引燃温度无明显影响;质量浓度的增大可使钛粉尘云引燃温度以二次函数的形式先减小后增大;粒径的增大使钛粉尘云最小引燃温度以二次函数的形式单调递增且增幅越来越大, 使钛粉尘层最小引燃温度以指数的形式单调递增且增幅越来越小;钛粉粒径相同时, 粉尘云最小引燃温度高于粉尘层最小引燃温度。

关键词：钛粉；粉尘云；粉尘层；引燃温度

Abstract：The Godbert-Grenwald furnace and minimum ignition temperature of dust layer testing apparatus were used to investigate minimum ignition temperature of dust cloud (MITC) and minimum ignition temperature of dust layer (MITL) of the spherical titanium powder with five different particle sizes. The function between MITC-MITL and particle size, and the functionbetween MITC and concentration were fitted. The results showed that the increase of spray pressure has no obvious effect on the ignition temperature of titanium dust cloud, the increase of mass concentration makes MITC decrease firstly and then increase in the form of quadratic function, the increase of particle sizes make MITC increase in the form of quadratic function, and make MITL increase in the form of exponential function, MITC is higher than MITL when the particle sizes is the same.

Keywords：titanium powder；dust cloud；dust layer；minimum ignition temperature