Bilingual Tech Mapping for Pulp Paper Guideline - Asosiasi Pulp ...

Pulp mills in Indonesia fulfill their energy
requirement by them self by power plant operations
through co-generation systems (cogeneration system). The
energy provided in the form of heat or steam and electricity
energy to drive machinery. In the pulp mill there are only 2
types of boilers is the recovery boiler and power boiler.
Approximately 70% of energy supplied from the recovery
boiler while the rest is supplied from the power boiler.
Figure 2.2 shows a diagram of energy distribution in
the pulping process. For recovery boiler, fuel obtained from
black liquor which is a liquid reaction products between
cooking chemicals (white liquor) with wood raw material.
This fluid is obtained from the pulping process after
concentration. Energy supply in the recovery boiler is one
cycle of the chemicals recovery process in the Kraft pulping
process. Fuel power boilers consist of biomass derived
from barking and reject screening process wood flakes (pin
chips and fines chips). To add calorific value of biomass it
is usually mixed with coal.
Theoretically, the Recovery Boiler produce steam is
15.8 GJ / ADT and electricity 655 kWh / ADT. Steam
needed is fulfilled by the Recovery Boiler, and the rest of
electricity needed met by the bark-fired boilers.
2.2 Papermaking Technology
Paper is made from three main materials, namely
fiber, water, and additives. All of these materials are
processed in stock preparation, then sent to the paper
machine to form sheets, then pressed and dried. In
general, the process of papermaking can be seen in Figure
2.3.
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