Nippon Daishowa Paperboard Co., Ltd. (NDB) has installed coal and wood chip co-firing circulating fluidized bed boiler at Akita Mill in 2008. After new power plant installation, oil boiler was stopped and used as a backup power.
NDB has reduced the energy cost by fuel switching from oil to coal, and also reduced the CO
2 emission by utilizing wood chip as a fuel. However currently the cost of disposal ash generated from fuel combustion, and the cost of additional bed material are a cause of an increase in the total running cost.
In this paper, we introduce about the outline of the bottom ash recycle system installed in Aug 2010 to further reduce the running costs and actual operation experiences.
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