| 摘要 |
<p>Concentration of a liquid by evaporation is performed in a heat exchanger having riser tubes (2) for the liquid and a granular mass fluidised by the liquid to occupy the tubes. At their upper and lower ends the tubes open into upper and lower chambers. A hot medium contacts the tubes to transfer heat to the liquid. In order to render this heat exchanger effective for evaporation concentration, means (13, 14) are provided for vapour collection and discharge from the upper chamber, the riser tubes extend above the base (3) of the upper chamber. A return conduit (16) for recirculation of the liquid and granular mass connects the upper chamber to the lower chamber, opening in each case at a lower level (22, 24) than the riser tubes. Supply and discharge connections (11, 18) for the liquid are at levels lower than the upper ends of the riser tubes.</p> |
