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Optimal Multi-Period Investment Analysis for Flexible Pulp Mill Utility Systems

Elin Svensson (Institutionen för energi och miljö, Industriella energisystem och -tekniker )
12th International Symposium on Process Systems Engineering (PSE) / 25th European Symposium on Computer Aided Process Engineering (ESCAPE), Copenhagen, Denmark May 31 - Jun 04, 2015 (1570-7946). Vol. 37 (2015), Part C, p. 1853-1858.
[Konferensbidrag, refereegranskat]

The techno-economic potential for new technologies in pulp mills is conventionally studied assuming annual averages, based on the assumption that the pulp mill is continuously operated at a constant production rate close to its design capacity. Recent work has shown, however, that a technology, such as lignin extraction, which can improve the operating flexibility of the pulp mill utility system, has a value associated with its flexibility that is not captured in such average-value models. These previous results indicated a risk of significant errors if heat load variations were not properly modelled. This paper presents a multi-period optimization model for the planning of design and operating decisions connected to pulp mill utility systems, which in this work has been extended with back-pressure and condensing turbine models. The model optimizes technology selection, equipment capacities and operating loads under the influence of demand variations, considering part-load efficiencies and operating load limits. Application of the model to an illustrative example showed that lignin extraction can compete with electricity production already at a lignin price of 22 €/MWh in the presence of variations due to poor off-design performance for the turbines. This demonstrates the usefulness of the proposed modelling approach.

Nyckelord: Lignin extraction, Multi-period, Pulp mill, Steam turbine, Utility system



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Denna post skapades 2015-10-08. Senast ändrad 2016-01-21.
CPL Pubid: 223873

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Industriella energisystem och -tekniker (2015-2017)

Ämnesområden

Energi
Hållbar utveckling
Energiteknik
Kemisk energiteknik

Chalmers infrastruktur