Abstract
<jats:p>Integration of work exchanger network (WEN) and heat exchanger network (HEN) can cut larger corners of energy costs for chemical plants. With this in mind, a new conception is proposed, of single-motor-turbine-pump (SMTP) pressure exchanger, to describe the achievement of pressure, or momentum, recovery from liquid streams of respectively higher and lower pressures. Along with SMTP, a new optimization method is suggested, for simultaneous syntheses of WEN-HEN schemes to recover pressure and heat for streams, all in liquid phase. Under assumed isobaric and isothermal condition, stage-wise HEN can be embedded into WEN to form a combined WEN-HEN superstructure, which turns out to be a problem of mixed-integer nonlinear programming (MINLP). Accurately verified by two case studies with commercial software. Aiming at minimizing economic expenditures specifically in our discussion, WEN-HEN is proven to be essential to improve both pressure and heat recoveries.</jats:p>