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ESteam™ Steam System Model for EXCEL© Veritech’s ESteam™ program is a powerful steam simulation program that uses Microsoft Excel® and brings unprecedented levels of steam system analysis via spreadsheet technology. The Excel® spreadsheet package facilitates rapid customization of the model—from online data retrieval to automated case study analysis—with minimal training. By leveraging the user’s existing knowledge of spreadsheet functionality, the ESteam system is extremely flexible, easy to learn, and inexpensive to maintain. The interactive user interface (Figure E-1) uses built in forms and dialogs to make input of steam system details very simple. An interactive drill-down feature for program navigation provides a multi-layered viewing capability ranging from a complete system overview (Figure E-2) to individual plant units to individual steam users. Simplifying Steam System Modeling Complex steam systems can be modeled using rigorous steam property data, without having to construct the complex heat and material balance equations normally required with competitive steam property add-in programs. The model performs rigorous heat and material balances at all levels (Figure E-3) and also by process unit (Figure E-4) and allows full flexibility for specifying steam users, steam generators, steam turbines, condensate return, flash steam, blowdown and deaeration schemes (Figure E-5), letdown arrangements and desuperheating configurations. ESteam generates all this automatically without the need to manually construct the balance equations Included in the economic module (Figure E-6) is the ability to specify boiler efficiency vs. load profiles and operating logic to more accurately model actual boilerhouse fuel consumption. Important ancillary boiler costs for services such as boiler feed water (BFW) and make-up water pumping, forced draft fan operation, BFW chemicals and cooling water costs for condensing turbine surface condensers are also included to more accurately reflect true steam generation and distribution costs. Real-time Performance Monitoring and Optimization Designed for access to plant information systems, ESteam generates real-time plant steam balances and operating characteristics as a basis for performance monitoring and optimization. Case study scenarios are simple to generate, using current or historical performance information, including, for example, the addition of new units and steam system components, unit shutdowns or turndowns, modified steam use and generation quantities, different turbine lineouts and configurations such as moving users and turbines between steam levels. The program adjusts the steam balance and maintains heat and material balance integrity automatically. The ESteam model optimization program will advise on actions related to boiler, turbo-generation, and steam turbine operations (Figure E-7) to properly balance and optimize the operating cost of the overall steam system. The optimal operating point for boiler loads and turbo-generators will be determined, along with optimized fuel selection and the optimal line-out for steam turbine drives that have options for interchange with electric motor drives. Analyzing Steam System Performance The ESteam Performance Summary and ESteam Database Viewer applications give ESteam a powerful performance monitoring and trending capability to help analyze steam system performance (Figure E-8).
Other miscellaneous users and turbine operating data are also tracked. Data can be recalled for historical trending and analysis in the ESteam Database Viewer. |
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