| 摘要 |
PURPOSE:To make a temperature distribution uniform along the width of a furnace by supplying a motive air with a pump when a load is low. CONSTITUTION:A branch passage 15 is provided at an upper stream position of a branch point of an inside flowing air and an outside flowing air in an air supply duct 1, a flow control valve 16 is provided in the branch passage 15, a pressure boosting blower 17 is also provided, and the motive air exhausted from the blower 17 is blown out in a straight stream from a motive air blow out opening 19 through a motive air supply pipe 18. The motive air blow out opening 19 is provided in a baffle 7 for the inside flowing air or in a baffle 10 for the outside flowing air, or in an area of the gaseous fuel blow out opening 14, and is preferably provided at an upper position of centers thereof. The blower 17 is operated automatically when the load of a burner is lowered to 15% below of a rated load, and then a proper amount of the air is supplied in a proper pressure. Thereby, the temperature distribution along the width of the furnace is maintained uniform, and materials to be heated arranged along the width of the furnace may be heated uniformly.
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