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THOUGHT LEADERS FOR MANUFACTURING & SUPPLY CHAIN
ARC INSIGHTS
By Tom Fiske
& Asish Ghosh
Apply MPC to gain significant benefits
through reduced batch cycle time and
improved batch-to-batch consistency,
effectively increasing plant capacity
without increasing capital outlays.
INSIGHT# 2003-48MP&H
NOVEMBER 19, 2003
Apply Model Predictive Control to Reduce
Batch Cycle Time and Increase Consistency
Keywords
APC (Advanced Process Control), Batch, MPC (Model Predictive Control)
Summary
Model Predictive Control (MPC), once applied almost exclusively to con-
tinuous processes, is now being applied successfully to batch process
control. Although MPC requires a higher initial investment in terms of dol-
lars and implementation time, for suitable applica-
tions the advantages over PID control are worthy
of the additional effort and expense. Batch manu-
facturers who use MPC are experiencing
significant benefits in the form of reduced batch
cycle time, which effectively increases plant capac-
ity without increasing capital outlays. Other
noteworthy benefits include improved product quality and consistency be-
tween batches. Typical applications that can benefit by adopting MPC
technology include batch reaction and distillation to name a few.
Analysis
Batch processes are widely applied in many sectors of the chemical, phar-
maceutical, food & beverage, polymer, consumer products, and
biotechnology industries, among others. Batch processes are frequently
utilized because of the inherent flexibility they possess in meeting market
demand under short notice through product mix adjustments. However,
batch processes are typically more difficult to optimize than continuous
processes since they rarely reach a steady state. This has resulted in the
adoption of inadequate control strategies and inefficient utilization of as-
sets.
With globalization of markets, increased competition, and a greater de-
mand for custom products, batch manufacturers have an increasing need to
achieve greater flexibility and just-in-time manufacturing. Leading eco-
nomic indicators suggest that the economic recovery will continue,
resulting in capacity-constrained production that further exacerbates the
ARC Insights, Page 2
©2003 • ARC • 3 Allied Drive • Dedham, MA 02026 USA • 781-471-1000 • ARCweb.com
The benefits of MPC applied to
batch processes can be just as
significant as those achieved with
continuous processes.
need to tightly control and optimize batch processes. Most improvement
efforts are now focusing on either scheduling optimization or process opti-
mization. Advanced process control is a technology that has important
implications for process improvements in batch operations.
Model Predictive Control for Batch Processes
MPC is an optimization-based multivariable control strategy that uses a
mathematical model, incorporated into a control system, to predict in real-
time the control action to be taken on the process. The predictive model
represents the relationship between the process inputs and the process out-
puts. The MPC has the ability to predict process behavior and proactively
take measures to optimize control.
MPC has been the most popular advanced control strategy since its incep-
tion a few decades ago. It has found broad application and widespread use
on continuous processes with well-documented benefits. Until recently,
MPC has found limited use in batch applications. Without a doubt, if
properly applied, advanced process control has the potential to improve
performance significantly. The benefits of MPC applied to batch processes
can be just as significant as those achieved with con-
tinuous processes.
Independent loop controllers perform poorly when at-
tempting to control processes with interacting control
variables. MPC is capable of providing improved con-
trol for this situation by anticipating and compensating for interactions be-
tween variables and control loops. In other words, the predictive nature of
the process model allows control loops to minimize the detrimental influ-
ence of a disturbance even before the actual affect of the disturbance is felt
on the loop. In addition, MPC allows the optimization of variables within
the constraint imposed.
MPC is equally applicable to single loops where PI or PID control performs
inadequately because of long dead times or large time constants. This
situation occurs quite frequently in manufacturing operations that utilize,
among others, batch reaction and distillation. Operations that are prime
candidates for applying MPC include those that are widely used in manu-
facturing processes and those that account for a significant amount of
added value.
ARC Insights, Page 3
©2003 • ARC • 3 Allied Drive • Dedham, MA 02026 USA • 781-471-1000 • ARCweb.com
By applying MPC, Baxter was able to
reduce batch distillation cycle time by
about 20 percent. Essentially, a
reduction in cycle time translates into
increase plant capacity.
MPC Migrates to Batch Applications
Several examples of MPC batch applications are available that demonstrate
that the benefits for batch operations are just as compelling as they are for
continuous processes. For example, BASF is using MPC on several batch
reactors at its ethyleneoxide-glycol surfactant plant. Prior to MPC imple-
mentation, the reactors used PI temperature control. The dynamic behavior
of the exothermic chemical reactions caused the PI control to oscillate be-
tween heating and cooling. About 5 to 10 percent of the time, the
oscillations were large enough to initiate a safety shutdown before the com-
pletion of the two-hour batch run.
BASF decided to use MPC on the reactors. The main reactor uses approxi-
mately 20 different recipes. It took about 4 months to perform the model
identification process for all 20 recipes using data collected from open loop
experiments. Since implementing MPC, BASF has
nearly eliminated all process stops.
Kaneka Delaware Corporation is a producer of
chemicals and plastics. They operate a batch poly-
vinyl chloride (PVC) reactor where it is difficult to
apply effective PID temperature control because the response is character-
ized by an open loop integrator with long delay and time constant.
However, for this application, temperature control is critical because the
amount and speed of product formation is highly dependent on maintain-
ing a specific temperature profile.
Before applying MPC, Kaneka resorted to sophisticated ad hoc PID control
strategies that used conservative temperature set point ramp rates to deal
with the poor PID controller performance. By applying MPC, Kaneka was
able to reduce the temperature variability by more than 60 percent. The
improved temperature control allowed the reactor to be operated at higher
temperatures, thus increasing reaction rates. This reduced the batch cycle
time by 35 percent and effectively increased overall plant capacity. Subse-
quent to the successful implementation, however, the plant stopped
production because of the decline in demand for PVC.
Baxter Healthcare is using MPC for its pharmaceutical facility that pro-
duces inhalant anesthetics. The MPC is being successfully applied to a
batch distillation operation. The inhalant is produced in batch reactors
along with other intermediates and byproducts. The inhalant products are
separated by a batch distillation process. This distillation has been con-
ARC Insights, Page 4
©2003 • ARC • 3 Allied Drive • Dedham, MA 02026 USA • 781-471-1000 • ARCweb.com
trolled with various combinations of traditional PID control for the past ten
years. The distillation process has been acceptable in terms of product yield
and quality, but had unacceptably long cycle times. Using MPC, Baxter
was able to shorten the cycle from about 18 hours to about 14 hours.
MPC Advantages and Disadvantages
Reduced batch cycle time is MPC’s biggest value proposition for batch
manufacturers. For production-constrained manufacturing, MPC can pro-
vide additional throughput or capacity without additional capital
expenditures. In addition, MPC reduces process variability for improved
safety, higher quality, and better batch-to-batch consistency. These benefits
must be weighed against the fact that MPC is more expensive to implement
due to the need to build a process model and may be more difficult to
maintain.
Recommendations
• Consider adopting MPC on major process units where significant value
is added to your product. Perform a cost/benefit analysis to determine
if the incremental cost of MPC implementation is justified relative to the
potential benefits.
• Identify critical processes or bottlenecks where throughput or quality is
paramount. If the processes are characterized by long dead times or
time constants, consider replacing PID control with MPC.
• Operator training is key to sustaining the benefits of an MPC project.
Operators must be knowledgeable and comfortable using MPC other-
wise they will turn it off. This requires dedication and a commitment
by management.
• Many major control system suppliers and independent software sup-
pliers offer MPC packages for continuous control applications. Look
for a supplier with expertise or experience in applying MPC in batch
control applications.
Please help us improve our deliverables to you – take our survey linked to this
transmittal e-mail or at www.arcweb.com/myarc in the Client Area. For further
information, contact your account manager or the author at tfiske@arcweb.com or
aghosh@arcweb.com. Recommended circulation: All MAS-H & MAS-P clients.
ARC Insights are published and copyrighted by ARC Advisory Group. The infor-
mation is proprietary to ARC and no part of it may be reproduced without prior
permission from ARC.

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Apply model predictive control to reduce batch cycle time and increase consistency

  • 1. THOUGHT LEADERS FOR MANUFACTURING & SUPPLY CHAIN ARC INSIGHTS By Tom Fiske & Asish Ghosh Apply MPC to gain significant benefits through reduced batch cycle time and improved batch-to-batch consistency, effectively increasing plant capacity without increasing capital outlays. INSIGHT# 2003-48MP&H NOVEMBER 19, 2003 Apply Model Predictive Control to Reduce Batch Cycle Time and Increase Consistency Keywords APC (Advanced Process Control), Batch, MPC (Model Predictive Control) Summary Model Predictive Control (MPC), once applied almost exclusively to con- tinuous processes, is now being applied successfully to batch process control. Although MPC requires a higher initial investment in terms of dol- lars and implementation time, for suitable applica- tions the advantages over PID control are worthy of the additional effort and expense. Batch manu- facturers who use MPC are experiencing significant benefits in the form of reduced batch cycle time, which effectively increases plant capac- ity without increasing capital outlays. Other noteworthy benefits include improved product quality and consistency be- tween batches. Typical applications that can benefit by adopting MPC technology include batch reaction and distillation to name a few. Analysis Batch processes are widely applied in many sectors of the chemical, phar- maceutical, food & beverage, polymer, consumer products, and biotechnology industries, among others. Batch processes are frequently utilized because of the inherent flexibility they possess in meeting market demand under short notice through product mix adjustments. However, batch processes are typically more difficult to optimize than continuous processes since they rarely reach a steady state. This has resulted in the adoption of inadequate control strategies and inefficient utilization of as- sets. With globalization of markets, increased competition, and a greater de- mand for custom products, batch manufacturers have an increasing need to achieve greater flexibility and just-in-time manufacturing. Leading eco- nomic indicators suggest that the economic recovery will continue, resulting in capacity-constrained production that further exacerbates the
  • 2. ARC Insights, Page 2 ©2003 • ARC • 3 Allied Drive • Dedham, MA 02026 USA • 781-471-1000 • ARCweb.com The benefits of MPC applied to batch processes can be just as significant as those achieved with continuous processes. need to tightly control and optimize batch processes. Most improvement efforts are now focusing on either scheduling optimization or process opti- mization. Advanced process control is a technology that has important implications for process improvements in batch operations. Model Predictive Control for Batch Processes MPC is an optimization-based multivariable control strategy that uses a mathematical model, incorporated into a control system, to predict in real- time the control action to be taken on the process. The predictive model represents the relationship between the process inputs and the process out- puts. The MPC has the ability to predict process behavior and proactively take measures to optimize control. MPC has been the most popular advanced control strategy since its incep- tion a few decades ago. It has found broad application and widespread use on continuous processes with well-documented benefits. Until recently, MPC has found limited use in batch applications. Without a doubt, if properly applied, advanced process control has the potential to improve performance significantly. The benefits of MPC applied to batch processes can be just as significant as those achieved with con- tinuous processes. Independent loop controllers perform poorly when at- tempting to control processes with interacting control variables. MPC is capable of providing improved con- trol for this situation by anticipating and compensating for interactions be- tween variables and control loops. In other words, the predictive nature of the process model allows control loops to minimize the detrimental influ- ence of a disturbance even before the actual affect of the disturbance is felt on the loop. In addition, MPC allows the optimization of variables within the constraint imposed. MPC is equally applicable to single loops where PI or PID control performs inadequately because of long dead times or large time constants. This situation occurs quite frequently in manufacturing operations that utilize, among others, batch reaction and distillation. Operations that are prime candidates for applying MPC include those that are widely used in manu- facturing processes and those that account for a significant amount of added value.
  • 3. ARC Insights, Page 3 ©2003 • ARC • 3 Allied Drive • Dedham, MA 02026 USA • 781-471-1000 • ARCweb.com By applying MPC, Baxter was able to reduce batch distillation cycle time by about 20 percent. Essentially, a reduction in cycle time translates into increase plant capacity. MPC Migrates to Batch Applications Several examples of MPC batch applications are available that demonstrate that the benefits for batch operations are just as compelling as they are for continuous processes. For example, BASF is using MPC on several batch reactors at its ethyleneoxide-glycol surfactant plant. Prior to MPC imple- mentation, the reactors used PI temperature control. The dynamic behavior of the exothermic chemical reactions caused the PI control to oscillate be- tween heating and cooling. About 5 to 10 percent of the time, the oscillations were large enough to initiate a safety shutdown before the com- pletion of the two-hour batch run. BASF decided to use MPC on the reactors. The main reactor uses approxi- mately 20 different recipes. It took about 4 months to perform the model identification process for all 20 recipes using data collected from open loop experiments. Since implementing MPC, BASF has nearly eliminated all process stops. Kaneka Delaware Corporation is a producer of chemicals and plastics. They operate a batch poly- vinyl chloride (PVC) reactor where it is difficult to apply effective PID temperature control because the response is character- ized by an open loop integrator with long delay and time constant. However, for this application, temperature control is critical because the amount and speed of product formation is highly dependent on maintain- ing a specific temperature profile. Before applying MPC, Kaneka resorted to sophisticated ad hoc PID control strategies that used conservative temperature set point ramp rates to deal with the poor PID controller performance. By applying MPC, Kaneka was able to reduce the temperature variability by more than 60 percent. The improved temperature control allowed the reactor to be operated at higher temperatures, thus increasing reaction rates. This reduced the batch cycle time by 35 percent and effectively increased overall plant capacity. Subse- quent to the successful implementation, however, the plant stopped production because of the decline in demand for PVC. Baxter Healthcare is using MPC for its pharmaceutical facility that pro- duces inhalant anesthetics. The MPC is being successfully applied to a batch distillation operation. The inhalant is produced in batch reactors along with other intermediates and byproducts. The inhalant products are separated by a batch distillation process. This distillation has been con-
  • 4. ARC Insights, Page 4 ©2003 • ARC • 3 Allied Drive • Dedham, MA 02026 USA • 781-471-1000 • ARCweb.com trolled with various combinations of traditional PID control for the past ten years. The distillation process has been acceptable in terms of product yield and quality, but had unacceptably long cycle times. Using MPC, Baxter was able to shorten the cycle from about 18 hours to about 14 hours. MPC Advantages and Disadvantages Reduced batch cycle time is MPC’s biggest value proposition for batch manufacturers. For production-constrained manufacturing, MPC can pro- vide additional throughput or capacity without additional capital expenditures. In addition, MPC reduces process variability for improved safety, higher quality, and better batch-to-batch consistency. These benefits must be weighed against the fact that MPC is more expensive to implement due to the need to build a process model and may be more difficult to maintain. Recommendations • Consider adopting MPC on major process units where significant value is added to your product. Perform a cost/benefit analysis to determine if the incremental cost of MPC implementation is justified relative to the potential benefits. • Identify critical processes or bottlenecks where throughput or quality is paramount. If the processes are characterized by long dead times or time constants, consider replacing PID control with MPC. • Operator training is key to sustaining the benefits of an MPC project. Operators must be knowledgeable and comfortable using MPC other- wise they will turn it off. This requires dedication and a commitment by management. • Many major control system suppliers and independent software sup- pliers offer MPC packages for continuous control applications. Look for a supplier with expertise or experience in applying MPC in batch control applications. Please help us improve our deliverables to you – take our survey linked to this transmittal e-mail or at www.arcweb.com/myarc in the Client Area. For further information, contact your account manager or the author at tfiske@arcweb.com or aghosh@arcweb.com. Recommended circulation: All MAS-H & MAS-P clients. ARC Insights are published and copyrighted by ARC Advisory Group. The infor- mation is proprietary to ARC and no part of it may be reproduced without prior permission from ARC.