Effect of Unevenness of Brine Flows in the Huge Tube Bundle on Performances of the Test Module Plant of 100,000m³/d Multistage Flash Evaporator

Abstract

Unevenness of brine flows in the tube bundle of a multistage flash evaporation plant was measuredin regard to temperature and velocity. The plant was the test module of 100,000m³/d long tubedesigned high flow rate type multistage flash evaporator which was constructed and operated asthe national project on sea water desalination. The velocity and the temperature at the outlet ofsome of each heat transfer tube were measured by a pitot tube of 6mm O.D. and a sheathed CC thermo couple of 3.2mm O.D.
Relative standard deviation of the velocity and the temperature was respectively 0.125 and 0.11. The unevenness of data indicated no specific tendency due to the location of the tube at thebundle of 1.6m in diameter, although partialy depending on deviation in the measurement. Those data were discussed in connection with performances of tube bundle such as the over allheat transfer coefficient and the amount of exchanged heat, and it was found that these unevenness gave little affect toward the performance.