For investigating the effect of steam condensation on the flow, the steady flow on large power condensing turbine last stage was numerical simulated with commercial computational software CFX -5.
Most part of latent heat of the vapor and the sensible heat of water can be utilized several times because multi-stage falling film evaporation and condensation processes are utilized.
Three simple recovery processes of alkali in small-scale paper mill are evaluated, and single-stagecondensation-combustion process is stabler and more economic.