Developing a Detailed Simulation Model for Complete Mass, Energy and Chemical Balancing of Integrated Pulp and Paper Mills

ABSTRACT
The pulp and paper industry is energy intensive and faces challenges due to increased competition and rising
feedstock and energy prices. To address this, modern process modeling tools that can calculate complete-plant
material and energy balances are needed to analyze and optimize operating strategies and design changes. In this
work, a software simulation tool is presented built using an open-equation, object-oriented modeling framework,
which enables calculation of complete mass, energy and chemical balances around integrated pulp and paper mills.
Building on earlier work focusing on modeling extensions for recovery boilers and evaporator trains, unit operation
models have been added which can be used to model a complete integrated pulp and paper mill, including digesters,
evaporators, recovery boilers, recausticizing plant, bleach plant and paper machines. Using these newly developed
detailed sub-models for key plant sections and equipment, a complete plant model for an integrated pulp and paper
plant has been developed and is presented. Such an integrated model can be used to explore tradeoffs and analyze
the influence of different operating strategies and design parameters on overall plant cost and performance,
including to predict the consumption of raw materials and auxiliary fuels and the production of byproducts.  ;

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