Abstract: In order to study the effect of urea-formaldehyde resin adhesive on wood dust explosion, industrial analysis and element analysis were used. The explosion characteristics of wood dust containing urea-formaldehyde resin (sample A) and non-adhesive wood dust (sample B) were measured by laser particle sizer （SEM）, 20 L spherical explosive device, MIKE III testing device and thermostatic hot plate. The results show that the minimum ignition temperature of the dust layer decreases with the increase of the dust layer thickness, and the minimum ignition temperature of the samples A2 and B2 are 310 ℃ and 295 ℃ respectively when the dust layer thickness is 15 mm. The minimum ignition energies of samples A2 and B2 are 100~150 mJ and 50~100 mJ respectively, and the lower explosive limit concentrations of samples A2 and B2 are 125 g/m3 and 75 g/m3 respectively when the mass concentration is 1 250 g/m3. The maximum explosion pressures of A2 and B2 （200 mesh） are 0.67 MPa and 0.78 MPa, respectively, and the maximum explosion pressure rising rate are 26.96 MPa/s and 21.75 MPa/s, when the mass concentration is 200~1 500 g/m3. The results show that the ignition sensitivity and explosion intensity of sample A are lower than that of sample B, that is, the urea-formaldehyde resin has an inhibitory effect on wood dust explosion.

Key words: dust explosion, wood dust, urea-formaldehyde resin adhesive, ignition sensitivity, explosion intensity