Performance improvement services that enable plants to increase competitiveness under ever changing business conditions are very important for recycled fiber producers.
Mill wide brightness control
Metso and Canada’s Abitibi Bowater Inc. have developed a new process control application to reduce the impact of the deterioration in quality of recycled newsprint raw materials from single-stream collection programs. The company’s Thorold, Ontario mill produces 1200 tpd of 100% recycled furnish newsprint. The control system uses a mill wide approach, incorporating model predictive control, real-time optimization, real-time sensor validation, an operator advisory system and automated system monitoring to maintain final newsprint product brightness with a minimum cost of chemicals.
- The incremental costs of deinking chemicals, magazine content, and paper machine furnish brightening chemical were defined as part of the control system process modeling work.
- A production advisory system helps operators to set production targets that maintain the required DIP inventory while minimizing the impact on furnish quality.
- Brightness variation on the two paper machines has been reduced while the costs of achieving target brightness have been reduced significantly.
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