| 摘要 |
PROBLEM TO BE SOLVED: To prevent a duct main body outer plate from being partially heated to high temperature. SOLUTION: An insulator 30 is fitted on the inner surface of a duct main body outer plate 28 inside of which waste gas 59 is passed, Inside the outer plate 28, a denitrification catalyst bed 34 is arranged leaving a gap 35 from the insulator 30 on the side thereof. Between a corner part 39 of a front face 37 and a side face 38 of the denitrification catalyst bed 34 and the duct body outer plate 28 corresponding to the corner part 39, a seal 58 for preventing the leakage of waste gas 59 from the gap 35 on the side of a denitrification catalyst bed 34 is provided, and also the seal 58 is constituted of a seal material housing outer groove part 60 fitted to the duct body outer plate 28 side, a seal material housing inner groove part 62 fitted to the denitrification catalyst bed 34 side and slidably fitted in the seal material housing outer groove part 60 in the width direction of the denitrification catalyst bed 34, and a flexible seal material 57 interposed between the seal material housing outer groove part 60 and the seal material housing inner groove part 62 and able to extend and contract in the width direction of the denitrification bed 34. Furthermore, between the duct body outer plate 28 and the seal material housing outer groove part 60, an insulator 61 for preventing partial heating to high temperature is interposed. |
