A Rule-Based Steam Distribution System for Petrochemical Plant Operation

Abstract

A rule-based expert system for the optimal operation of plantwide steam distribution systems is proposed to minimize the net cost of providing energy to the plant. The system is based on the steady-state modeling and simulation of steam generation processes and steam distribution networks. Modeling of steam generation processes and steam distribution networks was performed based on actual plant operation data. Heuristic operational knowledge obtained from experienced plant engineers is incorporated in the form of IF−THEN rules. The proposed system could provide operational information when there were changes in the grade and amount of steam demand. The letdown amount from the very high pressure steam (VS) header and the amount of VS produced at the boiler showed good agreement with those of actual operational data. The prediction of an increase of boiler load caused by self-consumed steam made it possible to prevent an unexpected sudden increase of electricity demand.