Energy use of plywood by-products

Abstract

An effective way of using plywood by-products is burning to obtain energy required in the technological cycle of the production. The PRD 22000 boiler was operated on fuel mixture consisting of crushed plywood waste, birch bark, dry and wet veneer shorts, wood sanding dust and sawdust from line of plywood cutting, sufficiently high energy and environmental performances were obtained. However, periods of the boiler operation between shutdowns for cleaning of heating surfaces were short. Studies have shown that crushed plywood waste is the strongest contaminant of combusted fuel mixture since of its ash contains a very high amount of CaO, Na2O, K2O which cause the incrustation on heating surfaces. Wood sanding dust and sawdust from line of plywood cutting, which contain particles of abrasive material and binder resins used to fix it on sanding belts, as well as particles of glue used in the production of plywood occupy the second position in terms of pollution level. The exclusion of these components from combusted fuel mixture allows to multiply periods of boiler operation between shutdowns for cleaning of heating surfaces in six times.