Experience of Energy Reclamation from Biomass at Oji Nichinan Mill

Abstract

The heavy fuel oil and bark firing power boiler (#1 Boiler) has been operated successfully since 1960 for adjusting steam demand variation of Oji Nichinan mill.After the Oil Crisis, in order to reduce fuel oil consumption and promote biomass fuel utilization, Oji Nichinan mill has been conducting combustion adjustment tests and facility modifications.The increase of bark consumption and the start of refused tire firing were conducted in 1981, and the combustion of waste paper was started in 1990.From our experience. there are some difficulties to utilize biomass as a fuel sources; one is corrosion or erosion of pressure parts (furnace, superheater and boiler bank tubes) and the auxiliary equipment (air preheater, multi-cyclone). The other is formation of clinker on the stoker. As a countermeasure for corrosion and erosion, upgrade to the corrosion resistant materials and replacements at regular intervals were conducted. However, the clinker formation has not been solved.This paper describes the process of fuel conversion to biomass and operating results of energy reclamation from biomass at #1 Boiler as an example of biomass utilization.