| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact, high temperature resistant and corrosion resistant air heater exhibiting excellent corrosion resistance and durability in the highly corrosive high temperature gas atmosphere of an incinerator. SOLUTION: A ceramic outer tube 4 is mounted on a ceramic receiving metal 3 suspended by a metallic inner tube 2, a metallic outer tube 30 at the upper part of the metallic inner tube 2 and the ceramic outer tube 4 are lapped, the gap between the outer circumferential surface of the metallic outer tube 30 and the ceramic outer tube 4 is sealed by an elastic sealant 32 and the ceramic outer tube 4 is arranged to slide in the axial direction and to move in the radial direction. Since ceramic tubes having different thermal elongation/ contraction rates are sealed to move independently, they can be protected against damage due to difference of thermal deformation. When extremely lightweight ceramic tubes weak against a tensile force but strong against a compressive force are stacked in the axial direction, a long air heater can be formed and thermal energy can be recovered sufficiently. |
