New Methods for Adaptation to Degeneration in Process Models for Process Industries
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Christer P Karlsson
The implementation of model-based control and diagnostics suffer strongly from the fact that models deteriorate as a function of process and sensor deterioration. Also, changes in the raw material (i.e. wood) may occur and often the process control is not addressing these variations in reality. It is thus vital for the model system to be robust in the sense that it is transparent and easy for the operator to maintain. Robustness is essential in many parts of the system, including measurement, process model validation, the ability of the model to adapt to changes in the process, optimization algorithms, and of course the model itself. In this paper, we first show three real-life applications of the utilization of models for diagnostics and control. Thereafter conditions for on-line adaptation of the models are discussed. The challenges when designing such a system are in achieving operator confidence, filtering of misleading measured data, adaptation of process parameters when the process parameters change, and combining validation of measurements and process models. These challenges are met by using a combination of physical and statistical models and methods based on them such as model predictive control (MPC) and parameter estimation. The model should be maintained by a qualified engineer who should be able to explain the system to the operator so that it is understood and confidence can be maintained.
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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Articles in the same Issue
- Article
- Statistical Approaches to Estimating the Relative Contribution of Intermolecular Interactions in Aliphatic Alcohols: Application to QSPR/QSAR Modeling of Their Boiling Points
- Alumina Sintering Kiln Flame Image Retrieval Based on ANN and Flame Shape Feature
- Study of Flow Field, Power and Mixing Time in a Two-Phase Stirred Vessel with Dual Rushton Impellers: Experimental Observation and CFD Simulation
- Hybrid Support Vector Regression and Genetic Algorithm Technique - A Novel Approach in Process Modeling
- Experimental Studies and CFD Modeling on the Effects of a Cut in the Baffle on Power Consumption
- Advanced Control for a Fire-Tube Shell Boiler System
- A Simplified Procedure for Quick Design of Dividing-Wall Columns for Industrial Applications
- Modeling and Energetic Analysis of Soybean Meal Drying in the Indirect Rotary Dryer
- Multivariable Fuzzy-Neural Model of Polymer Process
- Combined Experimental and Simulation (CFD) Analysis on Thermal Performance of Plate Heat Exchanger Using Kerosene as Working Fluid
- Modelling of Chromium Hexavalent Reduction by Ferrous Ion in a Batch Stirred Tank
- Process Simulation and Design of Reactive Distillation Column
- Modelling and Optimisation of an Industrial Ethylene Oxide Reactor
- Biofilter Response to Upsets in Process Conditions
- Optimization of Chemical Cleaning for Removal of Biofouling Layer
- Suspension Mixing Tank - Design Heuristic
- Pyrolysis Process Of Waste Polyethyleneterephtalate
- CFD Simulation of Solid Hold-Up in Gas-Solid Fluidized Bed at High Gas Velocities
- Non-Swirling Steady and Transient Flow Simulations in Short-Form Spray Dryers
- Development of a Hybrid Artificial Neural Network and Genetic Algorithm Model for Regime Identification of Slurry Transport in Pipelines
- Kinetics and Process Selectivity Studies for the Preparation of 3, 7-Dinitro-1, 3, 5, 7-Tetraazabicyclo [3, 3, 1] Nonane
- Flexibility Analysis in Flowsheet Simulation of Solids Processes
- New Methods for Adaptation to Degeneration in Process Models for Process Industries
- Hydro-Thermo-Mechanical Model for Highly Deformable Product during Convective Drying
- Modeling and Simulation studies for Aluminium - Fluoride Interactions in Nalgonda Defluoridation Process
- Modelling of Chlorine Contact Tank and the Combined Applications of Linear Model Predictive Control and Computational Fluid Dynamics
- Design of a PID Controller from a Predictive Control Algorithm
- A New Mixing-Cell-in-Series Model to Predict Breakthrough Curve in Chemically Heterogeneous Media at Column Scale
- Modeling of Adsorption of Chromium(VI) on Activated Carbons Derived from Corn (Zea mays) Cob
- A New Soft Sensor Based on Recursive Partial Least Squares for Online Melt Index Predictions in Grade-Changing HDPE Operations
- Effect of Operating Decisions on the Design and Energy Consumption of Inverted Batch Distillation Column
- CFD Modeling of Flow Pattern and Phase Holdup of Three Phase Fluidized Bed Contactor
- Chromium (VI) Adsorption on Activated Lignin
- Modeling of Phase and Chemical Equilibrium on the Quaternary System Acetic Acid, n-Butanol, Water and n-Butylacetate
- Hydrodynamics of a Bench-Scale Aerated Post Treatment Unit for Up-Flow Anaerobic Sludge Blanket Reactor
- Computational Models for the Determination of Antioxidant Capacity and Phenolics in Dietary Supplements Using Real-Time Proton Transfer Kinetics Data
- Potential Impact on Activated Sludge Treatment from the Implementation of Cellulosic Ethanol Production at a Pulp and Paper Mill
- Heat Transfer and Fluid Flow Analysis of Power Transformer's Cooling System Using CFD Approach
- Modeling Catalytic Combustion of Methane During the Warm-Up Period of the Converter
- Hybrid Modeling of Modified Mathematical Model for Gas Phase Olefine in Fluidized Bed Catalyst Reactors Using Artificial Neural Networks
- Effect of Intruded Exit on Riser Type Circulating Fluidized Beds
- Numerical Study on the Effect of Bend Angle on Turbulent Flow through Oscillating Bend
- Short Communication
- Methaemoglobin and Carboxyhaemoglobin Formation in Human Blood Due to NOx and CO Exposure: A Mathematical Model
- On the MPC of the Methanol Synthesis in a Simulated Moving Bed
- Review
- Modeling of Pyrolysis and Gasification of Biomass in Fluidized Beds: A Review
- Elevating Model Predictive Control Using Feedforward Artificial Neural Networks: A Review
- Letter to the Editor
- Comments on "Experimental Studies and CFD Modeling on the Effects of a Cut in the Baffle on Power Consumption"
- Comments on "Suspension Mixing Tank - Design Heuristic"