A RULE-BASED STEAM DISTRIBUTION-SYSTEM FOR PETROCHEMICAL PLANT-OPERATION

A rule-based expert system for the optimal operation of plantwide stea m distribution systems is proposed to minimize the net cost of providi ng energy to the plant. The system is based on the steady-state modeli ng and simulation of steam generation processes and steam distribution networks. Modeling of steam generation processes and steam distributi on networks was performed based on actual plant operation data. Heuris tic 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 a nd amount of steam demand. The letdown amount from the very high press ure steam (VS) header and the amount of VS produced at the boiler show ed good agreement with those of actual operational data. The predictio n of an increase of boiler load caused by self-consumed steam made it possible to prevent an unexpected sudden increase of electricity deman d.