Head Box Control

Abstract

Head box control requirements have been reviewed and the equipment required to achieve control has been discussed briefly . In addition, methods that have been used to model the head box successfully are described and discussed from both an analytic and practical point of view. Finally, six head box control schemes varying in complexity from a simple analog level control to a complex decoupled 3 x 3 controller (controlling head box total head, liquid level and flow from the box) are described and fully discussed. The paper is closed by a brief discussion of work that ought to be done in the relatively near future.