| 摘要 |
<p>In an illustrative embodiment of the invention, a steam and water drum of a steam generating system is provided with an optical viewing device, partially inserted through the drum's manway, which permits visual inspection or observation of the drum internals. The device comprises a transparent protective barrier, or window, at the end of the device within the drum, which eliminates fogging or moisture condensation on the window to ensure visibility, a water cooled lens system having a wide angle lens for increased angular exposure, and an eye piece or camera attached to the other end of the device disposed outside the drum.</p> |
