| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid bed drying device capable of appropriately drying wet fuel such as brown coal capable of improving the recovery efficiency of the latent heat of steam.SOLUTION: A fluid bed drying device includes a drying furnace 5, a fluidizing steam supply part 21 for supplying fluidizing steam to the drying furnace 5, heat transfer pipes 33 and 43 for heating brown coal in the drying furnace 5, and a steam compressor 135 which compresses the steam discharged from a lower stream side drying chamber 12b and supplies it to the heat transfer pipes 33 and 43. The drying furnace 5 includes an upper stream side drying chamber 12a and the lower stream side drying chamber 12b. The heat transfer pipes 33 and 43 include the upper stream side heat transfer pipe 33 provided in the upper stream side drying chamber 12a, and the lower stream side heat transfer pipe 43 provided in the lower stream side drying chamber 12b. The steam from the steam compressor 135 flows in the lower stream side heat transfer pipe 43, and then flows to the upper stream side heat transfer pipe 33. The fluidizing steam supply pipe 21 supplies fluidizing steam to the upper stream side drying chamber 12a and the lower stream side drying chamber 12b, and supplies the fluidizing gas which contains more non-condensable gas than the lower stream side drying chamber 12b to the upper stream side drying chamber 12a. |
