Optimal Shutdown Policy for Maintenance of Cracking Furnaces in Ethylene Plants

ERICA P. SCHULZ; J. ALBERTO BANDONI; M. SOLEDAD DIAZ

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

American Chemical Society

Año: 2006 vol. 45 p. 2748 - 2757

0888-5885

This work addresses the cyclic scheduling of cracking furnaces shutdowns in ethylene plants within a short term production planning model, based on a discrete time representation. Cracking furnaces are continuous parallel reactors that show decaying performance during their operation due to coke deposition on coil walls. For that reason, they must be periodically shutdown and cleaned. This behavior is modeled through binary variables and coil internal roughness, a variable whose increase has a linear dependence on operation time. After cleanup, roughness is at its lowest value and starts increasing again during operation. The cyclic scheduling model includes not only furnaces models but an entire plant mathematical model at each time interval to carry out production planning for meeting varying demands, as well as determination of main plant operating variables profiles and the prediction of an ethane recycle stream, which is an important feed to cracking furnaces and constitutes a key variable for the optimal shutdown schedule. The model includes nonlinear mathematical functions for each cracking furnace production as function of main process variables, simplified models for distillation columns in the separation train and raw material and product storage equations. Additional binary variables are included to force null values for production in shutdown furnaces. The resulting MINLP model is solved in GAMS with DICOPT++.