LIGNITE DRYING WITH CLOSED LOOP HEAT PUMP

摘要

The invention relates to a dryer system for drying lignite coal used in a power plant. The system comprises a dryer and a closed loop heat pump circuit that is configured and arranged to provide heat energy to the dryer. The closed loop heat pump circuit includes a working fluid, a dryer heat exchanger, an expansion device fluidly connected and downstream of the dryer heat exchanger, arranged to enable heat energy transfer from the vapour of the second outlet line to the first working fluid and a compressor for compressing the working fluid.

主权项

1. A dryer system for drying lignite coal for use in a power plant, the system comprising:
a dryer, adapted to dry lignite coal, having:
an inlet line for direction lignite coal into the dryer;a first outlet line for removing dried lignite coal from the dryer; anda second outlet line for removing vapour from the dryer, a closed loop heat pump circuit, configured and arranged to provide heat energy to the dryer, comprising:
a first working fluid;a dryer heat exchanger in the dryer;an expansion device fluidly connected and downstream of the dryer heat exchanger;an evaporator heat exchanger fluidly connected to and downstream of the expansion device and further connected to the second outline line so as to enable heat energy transfer from the vapour of the second outlet line to the first working fluid; anda compressor, fluidly connected to and downstream of the evaporator heat exchanger and at an upstream end of the dryer heat exchanger, for compressing the first working fluid.