PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® FROM THE PUBLISHERS OF PAPER TE Volume 9, Number 2, 2023
Achieving Optimal Paper Properties: A Layered Multiscale kMC and LSTM- ANN-Based Control Approach for Kraft Pulping PARTH SHAH 1,2 HYUN-KYU CHOI 1,2 & JOSEPH SANG-IL KWON 1,2 The growing demand for various types of paper highlights the importance of optimizing the kraft pulping process to achieve desired paper properties. This work proposes a novel multiscale model to optimize the kraft pulping process and obtain desired paper properties. The model combines mass and energy balance equations with a layered kinetic Monte Carlo (kMC) algorithm to predict the degradation of wood chips, the depolymerization of cellulose, and the spatio-temporal evolution of the Kappa number and cellulose degree of polymerization (DP). A surrogate LSTM-ANN model is trained on data generated from the multiscale model under different operating conditions, dealing with both time-varying and time-invariant inputs, and an LSTM-ANN-based model predictive controller is designed to achieve desired set-point values of the Kappa number and cellulose DP while considering process constraints. The results show that the LSTM-ANN- based controller is able to drive the process to desired set-point values with the use of a computationally faster surrogate model with high accuracy and low offset. Contact information: 1. Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA. 2. Texas A&M Energy Institute, Texas A&M University, College Station, TX 77845, US. Processes 2023, 11, 809. https://doi.org/10.3390/pr11030809 Creative Commons Attribution 4.0 International License
The Paper Industry Technical Association (PITA) is an independent organisation which operates for the general benefit of its members – both individual and corporate – dedicated to promoting and improving the technical and scientific knowledge of those working in the UK pulp and paper industry. Formed in 1960, it serves the Industry, both manufacturers and suppliers, by providing a forum for members to meet and network; it organises visits, conferences and training seminars that cover all aspects of papermaking science. It also publishes the prestigious journal Paper Technology International ® and the PITA Annual Review , both sent free to members, and a range of other technical publications which include conference proceedings and the acclaimed Essential Guide to Aqueous Coating .
Article 6 – Pulping
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