Effective MILP model for oil refinery-wide production planning and better energy utilization

A multi-period mathematical model for simultaneous optimization of materials and energy on the refining site scale

“…Fixed thermal efficiency of process heaters is widely used to calculate the fuel requirements of process units [41]. To obtain more accurate thermal efficiency, Eq.…”

“…The structure of utility systems was then formulated and integrated into a total site model [39,40]. The energy requirements of process units were further correlated with operating conditions and seasonal changes in Zhang and Hua [41]. Driven by rising energy prices, more accurate models of turbines and heaters were integrated into site models to optimize materials and energy simultaneously [42].…”

Refinery Production Planning: Multiperiod MINLP with Nonlinear CDU Model

“…The rectifying FI (FIr) is used if the temperature is greater than the component boiling temperature; otherwise, the stripping FI (FIs) is used. The following disjunction represents the FI choice, (10) where Yi,j,cr,t is the Boolean (binary) decision variable, γi,j,cr,t is a placeholder for the FI value, Tb,i is the component boiling point and Tj,cr,t is the cut point temperature.…”

“…The need for more accurate nonlinear representations of the process units as well as integrated planning and scheduling refinery operation models are recognized as key future challenges in the field 5,7,8,9 . Multiperiod refinery planning models tend to utilize linear equations for the process units 10,11,12 . The nonlinear implementation for the process unit in multiperiod planning models rely mainly on empirical relations 13 .…”

An MILP model for multi-period optimization of fuel gas system scheduling in refinery and its marginal value analysis

“…Davis (2004) and White (2005) proposed the concept of the fuel gas balance and recommended to model the planning model of the site-wide energy system integrating fuel gas, steam and electricity. Zhang and Hua (2007) embedded the MILP (mixed integer linear programming) model of utility system which included the fuel gas system into the plant-wide planning model for c h e m i c a l e n g i n e e r i n g r e s e a r c h a n d d e s i g n 8 6 ( 2 0 0 8 ) 1 4 1 -1 5 1…”