A New Cogeneration Targeting Procedure for Total Site

Estimation of cogeneration potential prior to the design of the total site utility system is vital to set targets on site fuel demand and steam flowrate as well as heat and power production. This paper introduces a new cogeneration targeting model that has been developed to estimate cogeneration potential of site utility systems. The new procedure has been developed for cogeneration targeting in the total site. The algorithm developed here provides a consistent, general procedure for determining the mass flowrates and the efficiencies of the turbines used. This algorithm utilizes the relationship of the entropy with the enthalpy and the isentropic efficiency. Finally the new model allows targeting shaftwork production, fuel consumption, cooling requirement, degree of superheat at process steam generators and steam boiler with high accuracy. It is superior to previous works in that it does not require cumbersome simulation for initiation, accurate and it can be traced easily which enhance its programmability. A case study is used to illustrate the usefulness of the new cogeneration targeting method for reducing the overall energy consumptions for the site.

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