INFLUENCE OF COOLING MEDIUM FLOW CHARACTER ON THE OPERATION OF HEAT EXCHANGERS WITH STEAM CONDENSATION INSIDE TUBES

The infl uence of the character of cooling medium motion in a heat exchanging apparatus on the process of steam condensation in the latter is considered in the cases of cross fl ow past a tube bank in the apparatus, longitudinal fl ow past tubes in the bank in the regimes of forward fl ow and countercurrent fl ow, superheated steam condensation, and of nonuniform distribution of the cooling medium in different zones of the apparatus. It has been established that in the case of cross fl ow past the fi rst rows of the tube bank, cooling medium zones with reduced heat transfer effi ciency appear in the apparatus. The dependence of the pressure losses by the steam, which condenses in a heat exchanger in regimes of countercurrent fl ow, forward fl ow, and cross fl ow, is investigated. Experimental data on the superheated steam temperature have been obtained and generalized. The positive infl uence of the throttle on the line of removal of the steam–air mixture to a steam–jet ejector in nonuniform cooling of the parallel channels of the condenser has been established experimentally, and the presence of the optimal size of the throttle on the line of removal of noncondensing gases has been confi rmed.
   
Author:  O. O. Mil′man, S. A. Isaev, A. V. Ptakhin, A. V. Kondrat′ev, A. Yu. Kartuesova, and V. S. Krylov
Keywords:  tube bank, steam condensation, superheated steam, nonuniform cooling, countercurrent fl ow, forward fl ow, throttle, noncondensing gases
Page:  1077