Survey of Multi-Level Computer Control Systems in the Pulp and Paper Industry

Abstract

The use of computer control within the pulp and paper industry has increased dramatically over the last few years. 1400-1500 computer control systems are estimated to exist today. The vast majority of these systems provide dedicated process control functions. Many of the systems are so called package systems. Statistical data are given to indicate the present situation.There is a growing interest in linking computers into multi-level or integrated computer control systems. In such a system the dedicated computer has its natural role, but the system will also provide supervisory functions such as production control, energy management, environmental control, efficiency control, reporting, different technical/administrative functions etc.This paper will indicate the present status in the Scandinavian and North American pulp and paper industry with respect to multi-level computer control systems. Some of the more advanced mills will serve as examples.These examples will on the one hand illustrate actual computer networks, on the other hand illustrate some non-process control applications.It is believed that the trends indicated in the paper will be relevant to many of the larger pulp and paper mills within the next 5-10 years.