| 摘要 |
PURPOSE:To provide a pot type burner capable of burning carbon when a combustion state where carbon adheres occurs is continued, by reducing a predetermined quantity of the fuel supply when combustion is continued for a predetermined period of time in the vicinity of a maximum fuel supply state. CONSTITUTION:In a grain drier 20 hot air flow is produced by a pot type burner 30. The hot air flow is sucked up by a blower 32, and is caused to flow along an air exhaust passage across the flow-down passage of grain from a hot air flow chamber 34. The hot air flow is delivered to the grain stored in a drying part 24 thereby to dry the grain. The temperature of the hot air flow is con trolled to a predetermined temperature higher than the carbon generating temper ature, and thereafter when a predetermined time has passed, the fuel is reduced and the rotation of the blower is reduced to lower the temperature within the combustion chamber. A control circuit judges whether the temperature within the combustion chamber is equal to a temperature preferable for combustion which is a temperature at which adhered carbon is burned, or not. Therefore, the temperature within the combustion chamber is controlled so that it becomes equal to the temperature preferable for combustion. |
