To provide a small air heating furnace using RPF as fuel and having good combustion efficiency and a warming device efficiently performing heat exchange to produce warm air from thermal energy accompanying the combustion of the RPF and supplying the warm air to an agricultural house.
Inside of a case body 10 having a closed structure connected to a warm air fan 71 to form a circulating path of air with the house by a blowout port 10b includes the air heating furnace 20 for generating hot air by using RPF as fuel; hot air pipe lines 61-63 for discharging hot air of the air heating furnace 10 to outside of the case body 10; radiators 40, 50 for releasing heat of the hot air from the hot air pipe lines 61-63 through heat exchange; and an RPF supply duct 27 for supplying the RPF sent from an RPF supply device 2 to the air heating furnace 20. The air within the case body 10 heated by the heat released from the radiators 40, 50 is blown out from the blowout port 10b to the house. The air heating furnace 20 injects combustion air from a vertically long band-shaped injection part to inside of an RPF combustion chamber.
Masayuki Kishida
Hiroshin Takano