Chemical Processing - October 2007 - (Page 53)

>> making it work making it work >> in the three columns, the application contains virtual online analyzers for the amount of ethanol in the bottoms of the beer and side stripper columns. The controller also includes models for measured disturbances such as beer feed and hydroheater temperature (e.g., waste heat flashed to the side stripper column). The hydroheater temperature provides a prediction of steam changes going to the side stripper column from the cook flash tank. Anhydrous alcohol quality control is the most important objective for the molecular sieves. The MPC application controls total ethanol production rate and end product quality by manipulating the sieve pressure and feed flow rate. The controller includes disturbance models for feed composition and temperature. Besides 190proof flow rate and composition, distillation and sieves variables are linked through the 190-proof tank level. PRESSURE-REDUCING REGULATOR . Supreme performance and precise control. The Model DA1 is a rugged high-pressure reducing regulator with unmatched capacity and rangeability. It provides constant and accurate control through the necessary range of flow. Where control valves were once needed, now it’s possible to install regulators, saving you time and money. Contact us for more information. the benefits Pavilion’s MPC technology provides a number of operational advantages: • Model updates and controller tuning can be made while the system is running, enabling rapid and correct implementation of changes in process dynamic behavior or in process limits. • Models don’t require further adjustment unless thereCAS-126A.indd are major modifications to the process. • The process is kept stable during fluctuations such as changes in the weather, the feed composition or temperature. In addition, BSE has realized significant economic benefits: • Higher average anhydrous alcohol production has resulted in a 10.24% increase in ethanol production. • The distillation/sieve/evaporator energy utilization per pound of steam/gallon of ethanol has been reduced by 9.6%. The APC project has allowed BSE to achieve record production rates by finding optimal process operating conditions, which also has cut the amount of energy needed per gallon of ethanol produced. Thanks to the APC project, BSE has overcome operational constraints that limited its process. Pavilion provided BSE with a tool that continually makes full use of the process’s operating capabilities. CP Jacob Duke formerly was plant manager of Badger State Ethanol’s Monroe, Wis., plant. Lina Rueda is an advanced process control engineer for Pavilion Technologies, Austin, Texas. E-mail her at LRueda@pavtech.com. P.O. Box 6 • Ellsworth, KS 67439-0006 Ph. (785) 472-4461 • Fax: (785) 472-3539 Innovative Solutions Cashco, Inc. www.cashco com Innovative Solutions 1 12/11/06 3:57:06 PM RefeRence 1. Wald, Mathew, “Is Ethanol for the Long Haul?,” Scientific American, p. 42 (Jan. 2007) www.chemicalprocessing.com http://www.cashco.com http://www.westernstates.com http://www.westernstates.com http://www.chemicalprocessing.com

Table of Contents Feed for the Digital Edition of Chemical Processing - October 2007

Chemical Processing - October 2007 Contents From the Editor ChemicalProcessing.com Field Notes In Process Energy Saver Compliance Advisor Biofeedstocks See Real Growth Become a Cyber-Security Pacesetter Go Beyond Condition Monitoring Disposable Equipment Earns Lasting Role Improve Control Loop Performance Ethanol Plant Boosts Output and Saves Energy Process Puzzler Plant InSites Equipment & Services Ad Lits Product Spotlight/Classifieds Ad Index End Point

Chemical Processing - October 2007

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