| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid bed drying device capable of achieving maximization of plant efficiency in a power generation facility.SOLUTION: A fluid bed drying device comprises: a high temperature fluid bed container 20 which has a high temperature heat transmission tube 21 where turbine extraction steam is introduced thereinto through a drying steam line 1 and heats a fluid bed S formed by fluidizing low grade coal supplied through a coal supply section 2 with the turbine extraction steam flowing in the high temperature heat transmission tube 21; and a low temperature fluid bed container 40 which has a low temperature heat transmission tube 41 where evaporated steam generated by heating the fluid bed S in the high temperature fluid bed container 20 is introduced thereinto through a steam discharge line 32 and heats the fluid bed Sh formed by fluidizing half dried low grade coal supplied in a half dried state from the high temperature fluid bed container 20 with the evaporate steam flowing inside the low temperature heat transmission tube 41. The evaporated steam is returned to the high temperature fluid bed container 20, with pressure thereof increased, through a fluidizing steam supply line 35 branched from the steam discharge line 32 as fluidizing gas to fluidize the low grade coal supplied to the high temperature fluid bed container 20. |
