The particle size distribution of oolong tea dust produced by a tea company was characterized by laser particle size analyzer.The dust ignition sensitivity and explosion severity were experimentally studied in the ignition temperature of dust layer test instrument,Godbert-Greenwald furnace,Hartmann tube explosion experimental apparatus and Siwek 20 L spherical explosion test system.The experimental results show that the minimum ignition temperature of dust layer(MITL)is 250℃,the minimum ignition temperature of dust cloud(MITC)is 510℃,the minimum ignition energy(MIE)is more than 1 000 mJ,the lower explosion limity(LEL)is 120 g/m3,the maximum explosion pressure is 0.82 MPa,the maximum pressure rise rate is 63.002 8 MPa/s,and the explosion index is 17.1 MPa·m/s,indicating that the explosion grade is St-1.Finally,the explosion characteristics of the dust were analyzed theoretically with the aid of thermogravimetric analysis and industrial analysis.The research results have certain reference value for understanding the explosion hazard of tea dust,the safety management of the processing workshop and the explosion-proof design.
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