Many deinking plants use vat type pulpers, often with batch operation. Batch pulpers have higher energy demand and lower productivity (NCASI, 2001. p. 130). Drum Pulpers can be implemented to mills that produce pulp from recovered paper and paperboard. The more gentle mechanical action of the drum pulpers make the contaminants to remain intact while the paper is defibrated. Drum pulpers have lower energy requirements than conventional mechanical pulpers, can use less water, and reduce fiber shortening. However, when drum pulpers are used in brown fiber applications, the rapid wetting of furnish and the incomplete removal of bailing wire can reportedly cause problems. (Kramer et al., 2009. p. 97)
Because baling wire must be removed from the paper prior to it entering the drum pulper, bale dewiring and bale breaking equipment may be required in addition to the drum pulper if it does not already exist at the mill.(NCASI, 2001. p. 130)
| Development Status | Products |
|---|---|
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Commercial
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Recycled Pullp
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| Parent Process: Recovered Fiber Pulping | |
|---|---|
| Energy Savings Potential |
A study suggests that if a vat type pulper is replaced with a continuous drum pulper in de-inking operations, energy consumption reduction by over 25% can be achieved. (Kramer et al. 2009. p. 97) |
| CO2 Emission Reduction Potential |
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| Costs |
Costs of a continuous drum or dry pulper will be higher than those of batch equipment with equivalent capacity. |
This Energy Guide discusses energy efficiency practices and energy-efficient technologies that can be implemented at the component, process, facility, and organizational levels.
This report from National Council For Air And Stream Improvement in the US provides descriptions of technologies for CO2 reduction in pulp and paper mills, and offers calculations on cost and CO2 savings.
For a 300 t/d capacity plant, CO2 reductions due to reduced power demand are estimated to be 1055 t CO2/y. (NCASI, 2001. p.131)