NC State
A.M. Al-Shaikh and D.B. Brewster. Entire pulpmill control. In Papermaking Systems and their Control, Trans. of the IVth Fund. Res. Symp. Oxford, 1969, (F. Bolam, ed.), pp 253–265, FRC, Manchester, 2018.


The hierarchical structure of pulpmill control is defined in terms of six levels-planning, scheduling, supervisory, mufti-variable, direct and data acquisition. The functions of each of these levels for a continuous digester are discussed. The design of the scheduling level is investigated for the case of a single pulpmill that must produce two species sequentially. It is shown to be primarily the problem of designing a feedforward control system for a process with a major dead time.

The relationship of plant design to controllability is discussed, using the example of determining the size of the vuln storage tanks.

Download PDF