Energy is the material base of human activity and doubtlessly saving energy is also a significant issue met with academia and industry societies. Crude distillation is so energy intensive that it reportedly requires up to 20-30% of the total that of the whole refinery. Presently, the energy conservation measures for this distillation unit are spontaneously directed to improving the energy recovery, which becomes more and more difficult along with the progress and maturity of technology in this respect. Ther...