Reactor controller: Specialized device regulates difficult exothermic reactions

10/04/2006


Advanced Process Control

Controller performance is demonstrated and compared in this trend chart.

Although reactors are major operating units in many chemical plants, keeping close control of temperatures in exothermic reactors is still a common problem. Many plants use poorly performing PID loops or do it manually and simply deal with resulting problems. CyboSoft has now developed a model-free adaptive controller, the MFA XRT, to regulate the temperature of an exothermic reactor.

Since heat and reaction speed are directly related in exothermic processes, the process can run away if the controller cannot respond quickly enough to stop it. "Typically, a non-self-regulating or run-away process like this could be controlled by using a P-controller," says Steve Mulkey, engineering director. "However, when the process also includes a large time delay, it becomes extremely difficult to control. A run-away process requires rapid control action to search for a new balance point and yet a process with a large time delay requires a patient control action. These two requirements are in conflict."

CyboSoft claims the MFA XRT controller solves this dilemma by providing a "smart" control signal. Its performance is demonstrated against a PID controller in a real-time simulation system that is included in the CyboCon MFA control software-Professional Edition. It shows how the controller on the top makes rapid and decisive adjustments to bring the reaction into balance, while the PID controller cannot get the operation in hand (see illustration). The patented model-free adaptive control approach is said to be key to these difficult applications.

For more about how the model-free approach works, click here to read an article from Control Engineering Europe on its complex operations.

-- Daily News Desk, Peter Welander ,
process industries editor , Control Engineering





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Robotic safety, collaboration, standards; DCS migration tips; IT/OT convergence; 2017 Control Engineering Salary and Career Survey
Integrated mobility; Artificial intelligence; Predictive motion control; Sensors and control system inputs; Asset Management; Cybersecurity
Big Data and IIoT value; Monitoring Big Data; Robotics safety standards and programming; Learning about PID
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
This article collection contains several articles on how automation and controls are helping human-machine interface (HMI) hardware and software advance.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Big Data and bigger solutions; Tablet technologies; SCADA developments
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me