| 摘要 |
PROBLEM TO BE SOLVED: To reduce an energy loss in a pressure reducer of a heat pump in utilizing the steam generated in drying low-grade coal, in heat exchange in reheating a heat source for drying the low-grade coal by the heat pump.SOLUTION: This low-grade coal drying system includes a low-grade coal dryer 102 for indirectly drying low-grade coal 101 by the latent heat of superheated steam A, the pressure reducer 121 for reducing the pressure of condensate water B by the condensation of the superheated steam A used in drying the low-grade coal 101, a heat exchanger 122 exchanging heat between the pressure-reduced condensate water B and the generated steam 104 generated from the low-grade coal 101 by drying, and the heat pump 120 having a compressor 123 for compressing the steam after the heat exchange, and a rotating shaft 121a of the pressure reducer 121 and a rotating shaft 123a of the compressor 123 are coaxially connected. |
