Case Study by Yokogawa: PT. Tanjung Enim Lestari Pulp and Paper (PT. TEL) operates a pulp mill in Muara Enim, which is 130 km west of Palembang, the capital of Indonesia’s South Sumatra province. This is the only pulp mill in the world to produce high-quality, bleached-hardwood kraft pulp solely from plantation grown Acacia mangium trees. Using a single vessel hydraulic type continuous digester that is designed for lo-solids cooking, the pulp mill produces 500,000 tons of pulp per year, making it one of the largest mills in southeast Asia.
With ISO 14001, ISO 9001, and Forest Stewardship Council - Chain of Custody (FSC-CoC) certification, PT. TEL is recognized for its diligent adherence to both quality and environmental management. The company’s operation in Indonesia is world class, and it has paid special attention to minimizing the environmental impact of the pulp mill’s digesting and recovery processes. The use of elemental chlorine has been completely eliminated in the bleaching process, and the mill has won the elemental chlorine free (ECF) designations. This pulp mill is very energy efficient, using only natural gas as the fuel source in the lime kiln process and black liquor and bark as fuel sources in the other processes.
In 2000, Yokogawa Indonesia installed CENTUM CS, a UNIX-based production control system (PCS), to control all operations at this mill. Although this system was running smoothly, technology change had made it obsolete. To improve operational efficiency, PT. TEL decided to upgrade this system to Yokogawa’s latest PCS offering, CENTUM VP. Installation by Yokogawa Indonesia was completed within a short period and the entire mill has been operating smoothly ever since.