H3-VH-18-D gear box flender Helical gear boxes H3

Flender/Flender Gear Units/Helical gear boxes H3

complet- ed by investigations in larger plants within an industrial and smallenkrprise scale. 3. Results During the combustion tests coated and uncoated wood-based materials of different compo sitions and structures were used as fuel Natural soft- and hardwood was used as comparative fuel, in the case of coated wood-based materials also the uncoated carrier material was used The plastics in the wood-based materials were binders and components of coating systems These plastics are condensation products of urea-, melamine- and phenol with formaldehyde, the reaction products of polymer methane diphenyle diisocyanate (PMDI) as well as polyvinyle chloride (PVD) and its copolymers. 1 The particleboards bonded with urea-formaldehyde resins (UF resins) - representing the lar- gestquantityofthewood-basedmaterialsinquestion burntalmostaswellasuntreatedwood: Only the emissions of nitrogen oxides were significantly higher when burning these wood- based materials in comparison to wood, the mean value was double to fourfold higher. This hi NOX-emission is due to the binder'scontent in or anically bonded nitrogen.Theemission vagues of nitrogen oxides were also higher for wood-%ased materials with other plastic com- ponents containing nitro en (melamine resins, diisocyanates) compared to natural wood or to wood-based residues wzich did not contain any nitrogen-based plastics. Particleboards bonded with diisocyanates showed combustion behaviour wh,ich is recogni- zably less favourable than that of wood or UF-particleboards, Besides higher emission of nitro- gen oxides particleboards bonded with PMDI also produced higher hydrocarbon and carbon monoxide values. This was due to the aromatic structure of the PMDl and the generated polyurethane respecti- vely. When bonded with phenol-formaldehyde resins (PF resins) particleboards and other wood- based materials turned out to be significantly more unfavourable for combustion. Besides the aromatic structure of