a planning procedure for total site integration of the utility hub in an oil refinery

This work presents a mathematical model for retrofitting of utility hub in a refinery site this problem is formulated as a mixed-integer nonlinear programming model feasible retrofit scenarios are investigated to reach maximum possible water and energy savings furthermore, techno economic simulation of water and energy recovery systems from boiler flue gasses has been examined to obtain the optimal condition of these systems for heat recovery, a systematic model for using organic rankine cycle has been developed and results showed that toluene is the best possible working fluid amongst candidates in this case finally, water absorption cycle with ethylene glycol has been simulated and results showed that up to 75 present of water vapor could be recovered maximum possible saving are up to 6 percent or 448 million dollars for basic scenario, the specific water and energy consumption are 428 and 0441 kg/kwh, respectively however, these may be reduced to 425 and 0429 kg/kwh in some scenarios