Kraft continuous digester effective alkali control

Dynamic Modeling Technology (DMT) is a new approach for modeling process transfer functions, which reduces the effort required to obtain accurate process models. DMT is able to automatically determine the structure of the transfer function model as well as the values of the model parameters using an unstructured approach based on orthonormal Laguerre functions. DMT provides several advantages compared to classical S-Plane (Laplace Transform) frequency response methods such as the ability to easily model high order behavior and process dead time. Although improved process control is an economical method to optimize product quality and achieve lower production costs, the requirement to reduce the cost of material and human resources needed to implement advanced process control on real world applications is an important factor in the realization of these savings. The benefits of process transfer function modeling using DMT are discussed. The application of DMT control to the Sheena cellulose plant Kraft continuous digester used for controlling effective alkali is also discussed