Direct Contact Heat Exchanger :

Low pressure steam may also be used to preheat the feed water or some other fluid where mis-

cibility is acceptable. This principle is used in Direct Contact Heat Exchanger and finds wide

use in a steam generating station. They essentially consists of a number of trays mounted one

over the other or packed beds. Steam is supplied below the packing while the cold water is

sprayed at the top. The steam is completely condensed in the incoming water thereby heating

it. A figure of direct contact heat exchanger is shown in Figure 8.14. Typical application is in

the deaerator of a steam generation station.

8. Waste Heat Recovery

188Bureau of Energy Efficiency

COLD

WATER IN

VEN

L.P.

HOT

Figure 8.14 Direct Contact Condenser