PURPOSE: To prevent a toxic gas from being generated and to safely and accurately supply fuel by providing a furnace that burns solid fuel containing carbon, a means to control the capacity of a fan to circulate air, a means to count and control the burning time, an excess carbon dioxide gas adsorber and a fuel supply device.
CONSTITUTION: The air in the storage compartment 15 is supplied to the furnace 27 through a duct 25 and a switch valve 56 by a fan 29 to burn the solid fuel 34. The waste gas enters into an adsorber 37 through cooling unit 28, connecting pipe 26, switch valve 43 and duct 39. Carbon dioxide is adsorbed by adsorbing material 47, and only nitrogen N2 is circulated to the storage compartment 15 through discharge pipe 41 and switch valve 44 out of a waste gas pipe 55. The fuel supply device 24 is operated to supply fuel for a desired period of time by a timer means 74. The capacity control means that controls the capacity of a fan 19 controls the air supply rate based on the signal from a gas monitor 60 that detects the oxygen concentration in the storage compartment 15.
TAKEDA JUN
NAGAI JUNICHI
SUZUKI JIRO
KAWASAKI YOSHITAKA
HOSAKA MASATO
MATSUSHITA ELECTRIC IND CO LTD