| 摘要 |
PURPOSE:To improve a heat-insulating effect by compact constitution by forming an air layer, which can be ventilated, between the inner plate and sheath plate of the exhaust duct of the gas turbine and each forming an air suction hole to the bottom of the sheath plate and an air exhaust hole to the upper section of the side surface of the sheath plate. CONSTITUTION:A heat-insulating material 18 is set up outside the inner plate 19 of the exhaust duct of the gas turbine, the sheath plates 16 of the exhaust duct are mounted outside the heat-insulating material 18 at regular intervals, and the air layer, which can be ventilated, is formed between both 18 and 16. The air suction holes 22 are formed to the bottoms of the sheath plates 16, and the air exhaust holes are formed to the upper sections of the side surfaces of the sheath plates 16. Accordingly, the temperatures of the heat-insulating material 18 and the sheath plates 16 of the exhaust duct rise, and air is flowed as shown in the arrow 17 from the arrow 20 by a natural convection when air in the air layer expands, and the heat-insulating material 18 is cooled. Heat transmission to the sheath plates 16 from the heat-insulating material 18 is inhibited, and a temperature rise of the sheath plate 16 is reduced. |
