Using Drum Pulpers

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
Commercial
Recycled Pullp

Using Drum PulpersCosts & Benefits

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)
Energy consumption can be reduced by 10 kWh/t-pulp as compared to a batch pulper (NCASI, 2001. p131)

CO2 Emission Reduction Potential

US flag 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)

Costs

Costs of a continuous drum or dry pulper will be higher than those of batch equipment with equivalent capacity.
US flag For a 300 t/d capacity plant , annual savings are estimated to be around $37 000 [2001 dollars] (NCASI, 2001. p.131)

Using Drum PulpersSchematic

Using Drum Pulpers Publications

Page Number: 

97

Page Number: 

130-131