| 摘要 |
<p>PCT No. PCT/GB94/01843 Sec. 371 Date Feb. 21, 1996 Sec. 102(e) Date Feb. 21, 1996 PCT Filed Aug. 23, 1994 PCT Pub. No. WO95/06229 PCT Pub. Date Mar. 2, 1995Apparatus for continuous drying of moist materials in superheated steam comprises a drying enclosure 10, open-ended inlet and outlet ducts 11, 12 communicating with the enclosure, and conveyors 13, 14, 15 for conveying the material to be dried along the inlet duct, through the enclosure and along the outlet duct. Superheated steam is generated in the enclosure from the moisture in the material 19 being dried by circulating the initial gas within the enclosure between a heat source 23 and the material, and/or by the injection into the enclosure of superheated steam from an external source. The inlet duct 11 and outlet duct 12 both extend downwardly from the enclosure 10 and a vent duct 22 from the enclosure has an outlet 26 normally at a level midway along the two ducts. In use, superheated steam tending to pass downwardly along the ducts meets external air tending to pass upwardly along the ducts and forms within each duct a temperature and density differential stratification layer 21. These layers act as barriers to the escape of steam from the enclosure while at the same time permitting the free conveyance of material along the ducts and into and out of the enclosure 10.</p> |
