| 摘要 |
<p>A fluidized bed drying device is provided with: a drying container (101) that forms a hollow shape; a raw coal introduction port (102) at one end of the drying container (101) through which raw coal is introduced; a dried coal discharge port (103) that discharges from the other end of the drying container (101) the dried coal that results when the raw coal is heated and dried; a fluidizing gas supply port (104) that supplies a fluidizing gas to the lower part of the drying container (101) to form, together with the raw coal, a fluidized bed (S); a gas discharge port (105) that discharges the fluidizing gas and generated steam from a location higher than the raw coal introduction port (102) at one end of the drying container (101); and a heat transfer pipe (106) that heats the raw coal in the fluidized bed (S). A control device (125) adjusts the degree of opening of a flow volume adjustment valve (114) of a gas discharge line (113) on the basis of the temperature of the fluidized bed (S) as detected by a first temperature sensor (121), and thus changes the dew-point temperature by changing the pressure inside the drying container (101), which enables improved drying efficiency.</p> |
