Analysis of a mechanical pulp and paper mill using advanced composite curves

Abstract

To cite this version:Pekka Ruohonen, Pekka Ahtila.Analysis of a mechanical pulp and paper mill using advanced composite curves.Applied Thermal Engineering, Elsevier, 2009, 30 (6- This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT Analysis of a mechanical pulp and paper mill using advanced composite curvesPekka Ruohonen *), Pekka Ahtila ACCEPTED MANUSCRIPT AbstractIn this study a mechanical pulp and paper mill is analysed using advanced composite curves. It is a graphical pinch-based approach that takes into account the existing heat exchanger network and the utilities actually used at the mill. The possibilities of making a cost-effective heat exchanger retrofit in an operating mechanical pulp and paper mill are discussed. The study also shows that the advanced composite curves can be used to describe the amount of nonisothermal mixing taking place in the process.

Process simulation-based evaluation of design and operational implications of water-laid paper machine conversion to foam technology

“…The level of detail in the simulation studies on conventional pulp and papermaking processes reported in the literature ranges from small-scale chemical reactions to mill-wide process calculations and from steady state to dynamic simulations. The steady state simulation studies have focused on 1) optimizing the raw material, fresh water, energy or utility consumption (Bortolin et al 2004;Turon et al 2005;Cardoso et al 2009;Atkins et al 2010;Ruohonen and Ahtila 2010;Jönsson et al 2011;Mǎluţan and Mǎluţan 2013); 2) the build-up of dissolved substances (Sorsamäki et al 2019); 3) studying the cost implications of different integrated modernization strategies (Hytönen and Stuart 2012); and 4) studying the chemical state of the plant (Clément et al 2011;Huber et al 2013). Although many studies have focused on dynamic simulation and paper machines, only a few approaches to the dynamics of a paper machine at an industrial scale are available (Blanco et al 2009).…”

Simplification of Data Acquisition in Process Integration Retrofit Studies Based on Uncertainty and Sensitivity Analysis

“…Concerning industrial processes, Process Integration (PI) methodologies proved to be highly effective in identifying and promoting energy saving possibilities. Potential savings from 10 to 75% have been reported in industrial sectors ranging from petrochemical (Nordman and Berntsson, 2009;Smith et al, 2010;Bütün et al, 2018), to pulp and paper (Ruohonen and Ahtila, 2010), and to food processing (Muster-Slawitsch et al, 2011). PI techniques consist in a collection of methods aiming at the identification of energy recovery opportunities in the industry (see Morar andAgachi, 2010 andSreepathi andRangaiah, 2014 for comprehensive reviews).…”

Coupling a Chemical Reaction Engine with a Mass Flow Balance Process Simulation for Scaling Management in Papermaking Process Waters

“…Computer simulations have proved very useful to design and optimize papermaking processes . Various applications dedicated to pulp and paper processes have been developed using some of the major simulation packages: ASPEN Plus, , BALAS, CADSIM, PROSIM, PS2000 (G2-based), WinGEMS, and others. On the other hand, chemical speciation methods have been shown to accurately describe the scaling tendency of process waters, even in contaminated flows of closed circuit board mills .…”