The sense of urgency to energy-saving and emission-reduction, and current carbon-emission were stated in this paper. The main factors for low-efficiency of energy utilization in traditional grain drying and wood drying were analyzed; the energy recycling from discharging humid air is one of the main way of energy-saving path for traditional drying, and there is evident energy-saving effect with common heat exchanger, heat-pump, and heat-pipe; the energy-saving rate is about 12.4% with common heat-exchanger, and it is about 40% with heat-pump＇s...
