| 摘要 |
<p>A method for drying fluid (1) concentrates, after spraying, to give a powder, which concentrates, as drying progresses, display a so-called critical moisture content point in which method the fluid to be dried is sprayed in a hot first drying gas (2) of which the inlet temperature and the amount of the first drying gas are so chosen that the product (1) to be dried acquires a moisture content which is approximately equal to the critical moisture content point after which, by means of a second, freshly supplied drying gas (5), the drying of the product is continued to the equilibrium point, the sprayed product being collected after a certain time on a porous screen element, and the drying gas being completely or substantially drawn through the screen element and transported to a gas outlet, while the drying product forms a porous layer and the exhausted first drying gas is mixed with an amount of added second drying gas in a mixing layer, close above the permeable product layer on the screen element, in which mixing layer the two drying gases and the product are subject to a virtually complete mixing.</p> |
