Physical aspects of fire and explosion hazard of combustible dust. Part 1.Ignition

Based on the fundamental combustible systems properties - distributed nonlinear energy sources and flow connection between environment elements an analysis of various combustion dust modes is presented. Depending ratio betweencharacteristic burning times (thermokinetic characteristics) heat transfer (scale characteristics), limiting are considered as self-ignition, diffusion auto-wave combustion. Unlike gases, for dusts all characteristics ignition essentially depend internal system scales particle sizes distances them. In presented part study, critical temperature dependences delay time physicochemical parameters analyzed. It shown that these fuels can be described in a unified way, based laws oxidation (linear parabolic), with systematizing parameterfbeing solid fuel reaction surface to external exchange surface.
 Taking into account parameter f, which aerosuspensionheat dust, conditions obtained form criterion similar single particles ignition. it used both linear parabolic law. Different react same way change does not contain reflects thedustheat accumulation capability. Thus, function 1/lnf, induction period 1/f.
 The physical or chemical, but relativedust activity relation their ignitionprocess. After all, they size vessel.