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    • 9. 发明专利
    • HIGH TEMPERATURE AIR HEATER
    • JPH10318527A
    • 1998-12-04
    • JP12968597
    • 1997-05-20
    • MITSUI SHIPBUILDING ENG
    • NANBA MASAOMIYATAKE NAOMASAKIUCHI HIDEHIRO
    • F23L15/00F23G5/46
    • PROBLEM TO BE SOLVED: To detect variation in the quantity of air to be introduced due to abrasion of a refractory protective tube while suppressing permeation of high temperature gas through the protective tube by introducing the air into a gap between a heating tube and the protective tube thereby providing a positive pressure in the gap as compared with the outside (high temperature gas channel). SOLUTION: A high temperature air heater exchanges heat with high temperature gas G through a heating tube body 6, i.e. a heating tube 5 coated with a refractory protective tube 6, and heats up the air 8 flowing through the heating tube 5. A gap 7 is provided between the heating tube 5 and the protective tube 6 and the outer air is introduced into the gap 7 by an air introduction means 101 including a blower B in order to purge the corrosive high temperature gas G. According to the structure, the high temperature corrosive gas is prevented from being diffused reversely into the air 8 to be heated or being mixed therewith even when the high temperature corrosive gas permeates the wail of the protective tube 6 and intrudes into the gap 7 thus enhancing durability of the heating tube 5, and the like. Furthermore, the air introduction means 101 is provided with an air flow meter 103 and soundness of the protective tube 6 is evaluated based on the tracking results.