Nonlinear Multiphysics Modeling of Batch Digester Discharge Dynamics with Rheology-Driven Hydraulic Transport and Drainability Coupling

TL;DR

This paper develops a nonlinear dynamic model and control strategy for batch digester discharge, accounting for complex rheological and hydraulic behaviors to improve regulation.

Contribution

It introduces a comprehensive nonlinear model integrating slurry rheology and hydraulic effects, along with a robust control method for industrial digester discharge regulation.

Findings

The model captures nonlinear hydraulic transport dynamics accurately.

The control strategy effectively manages discharge flow despite rheological uncertainties.

The framework enhances understanding of slurry behavior in digester systems.

Abstract

Batch digester blowdown operations exhibit highly nonlinear hydraulic transport dynamics due to evolving slurry consistency and rheological uncertainty. This work presents a nonlinear dynamic model and a robust Sliding Mode Control (SMC) strategy for discharge-flow regulation in industrial batch digester systems. The proposed framework incorporates non-Newtonian slurry rheology, consistency-dependent hydraulic resistance, drainability effects, channeling phenomena, and nonlinear hydraulic transport behavior.