Waste heat integration between processes III: Mixed integer nonlinear programming model

The simultaneous heat and power integration between processes using mixed integer nonlinear programming (MINLP) contains equations of structural and parametric optimization of the nonretrofitted or retrofitted plants. High pressure steam production and generation of electricity using a steam turbine are included in the integrated structure. MINLP can predict: the optimum energy target of the integration between processes, steam and electricity production. The approach has been illustrated by four complex processes (solvent production, formalin production, methanol production and oil refinery) using MINLP. The objective function have maximized the annual profit of heat and power integration to 303,2 kUSD/a.