Chemical Processing - June 2008 - (Page 33) ˚C ReactoR tempeRatuRe control typically is very important to product quality, production rate and operating costs. With continuous reactors, the usual objectives are to: • hold temperature within a certain band around the set point, preferably without oscillation; • minimize operator intervention; and • minimize consumption of utilities. Batch reactors generally demand some additional objectives such as: • fast heatup or cooldown to a new set point without oscillation and with minimal overshoot; and • stable response to load disturbances, e.g., an exothermic reaction. Achieving these objectives requires paying attention to many details of the equipment and controller logic. Systematic testing and optimization of the feedback control loops also can speed the startup of a new plant. Figure 1 shows a common control system for glass-lined batch reactors where the slave loop operates on the jacket inlet temperature to protect the lining. The heating/cooling supply can have various split-range (TY) configurations such as control valves to hot/cold headers (which we’ll call Case 1), control valves to steam and chilled-water heat exchangers (Case 2) and control valve on the chilled fluid and variable electrical heating (Case 3). Here, we’ll look at some challenges and opportunities based on real data from three such reactors as 33 chemicalprocessing.com JUne 2008 http://chemicalprocessing.com
Table of Contents Feed for the Digital Edition of Chemical Processing - June 2008 Chemical Processing - June 2008 Contents From the Editor ChemicalProcessing.com Field Notes In Process Energy Saver Compliance Advisor Achieve Model Operations Bolster Your Condition Monitoring Toolbox Particle Analysis Makes Solid Progress Improve Batch Reactor Temperature Control Improve Your Job Security Plant InSites Process Puzzler Equipment & Services Product Spotlight/Classifieds Ad Index End Point Chemical Processing - June 2008 Chemical Processing - June 2008 - Chemical Processing - June 2008 (Page Cover1) Chemical Processing - June 2008 - Chemical Processing - June 2008 (Page Cover2) Chemical Processing - June 2008 - Chemical Processing - June 2008 (Page 3) Chemical Processing - June 2008 - Chemical Processing - June 2008 (Page 4) Chemical Processing - June 2008 - Contents (Page 5) Chemical Processing - June 2008 - Contents (Page 6) Chemical Processing - June 2008 - From the Editor (Page 7) Chemical Processing - June 2008 - From the Editor (Page 8) Chemical Processing - June 2008 - ChemicalProcessing.com (Page 9) Chemical Processing - June 2008 - ChemicalProcessing.com (Page 10) Chemical Processing - June 2008 - Field Notes (Page 11) Chemical Processing - June 2008 - In Process (Page 12) Chemical Processing - June 2008 - In Process (Page 13) Chemical Processing - June 2008 - In Process (Page 14) Chemical Processing - June 2008 - Energy Saver (Page 15) Chemical Processing - June 2008 - Energy Saver (Page 16) Chemical Processing - June 2008 - Compliance Advisor (Page 17) Chemical Processing - June 2008 - Achieve Model Operations (Page 18) Chemical Processing - June 2008 - Achieve Model Operations (Page 19) Chemical Processing - June 2008 - Achieve Model Operations (Page 20) Chemical Processing - June 2008 - Achieve Model Operations (Page 21) Chemical Processing - June 2008 - Achieve Model Operations (Page 22) Chemical Processing - June 2008 - Bolster Your Condition Monitoring Toolbox (Page 23) Chemical Processing - June 2008 - Bolster Your Condition Monitoring Toolbox (Page 24) Chemical Processing - June 2008 - Bolster Your Condition Monitoring Toolbox (Page 25) Chemical Processing - June 2008 - Bolster Your Condition Monitoring Toolbox (Page 26) Chemical Processing - June 2008 - Bolster Your Condition Monitoring Toolbox (Page 27) Chemical Processing - June 2008 - Bolster Your Condition Monitoring Toolbox (Page 28) Chemical Processing - June 2008 - Particle Analysis Makes Solid Progress (Page 29) Chemical Processing - June 2008 - Particle Analysis Makes Solid Progress (Page 30) Chemical Processing - June 2008 - Particle Analysis Makes Solid Progress (Page 31) Chemical Processing - June 2008 - Particle Analysis Makes Solid Progress (Page 32) Chemical Processing - June 2008 - Improve Batch Reactor Temperature Control (Page 33) Chemical Processing - June 2008 - Improve Batch Reactor Temperature Control (Page 34) Chemical Processing - June 2008 - Improve Batch Reactor Temperature Control (Page 35) Chemical Processing - June 2008 - Improve Batch Reactor Temperature Control (Page 36) Chemical Processing - June 2008 - Improve Batch Reactor Temperature Control (Page 37) Chemical Processing - June 2008 - Improve Your Job Security (Page 38) Chemical Processing - June 2008 - Improve Your Job Security (Page 39) Chemical Processing - June 2008 - Improve Your Job Security (Page 40) Chemical Processing - June 2008 - Improve Your Job Security (Page 41) Chemical Processing - June 2008 - Plant InSites (Page 42) Chemical Processing - June 2008 - Process Puzzler (Page 43) Chemical Processing - June 2008 - Process Puzzler (Page 44) Chemical Processing - June 2008 - Equipment & Services (Page 45) Chemical Processing - June 2008 - Product Spotlight/Classifieds (Page 46) Chemical Processing - June 2008 - Product Spotlight/Classifieds (Page 47) Chemical Processing - June 2008 - Product Spotlight/Classifieds (Page 48) Chemical Processing - June 2008 - Ad Index (Page 49) Chemical Processing - June 2008 - End Point (Page 50) Chemical Processing - June 2008 - End Point (Page Cover3) Chemical Processing - June 2008 - End Point (Page Cover4)
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