Incineration of ResiduesCosts & Benefits
|Parent Process: Recovered Fiber Pulping|
|Energy Savings Potential||
One ton of rejects (from mills without de-inking) with about 45% water content can substitute 0.7 tons of brown coal in the boiler. in a German plant with 370 000 t/year production capacity, incineration of rejects in a hearth combustion (with a capacity of 28 000 t/year) that is integrated in the power plant of the mill, fossil fuel usage corresponding to 66 000 MWh was reduced.
|CO2 Emission Reduction Potential||
Because the rejects help substitute coal, and about 50% of solid matter in the rejects are CO2 natural substances, CO2 emissions are reduced.
The investment cost for a co-incineration plant including facilities for reject pretreatment, drying and the gasification chamber for a reject volume flow rate of maximum 3 t/hour is estimated to be around €2.5 million. In Europe, these can provide annual annual savings of €0.6 million, assuming costs for landfilling of €50/t. An additional EUR 0.3 million/yr can be saved through the substitution of brown coal.