在火力电站锅炉和汽轮发电机组以及水冷壁等设备的检修中，工业内窥镜发挥了重要作用，帮助发现并排除了大量的设备缺陷，保证了设备的安全运行。

Industrial endoscope plays an important role in the maintenance of boiler, steam turbine generator unit and water wall in thermal power plant. It helps to find and eliminate a large number of equipment defects and ensures the safe operation of the equipment.

水冷壁热侵蚀主要是因为因为向火侧水冷壁正面受气流冲洗，灰渣不易黏附，而水冷壁两侧与鳍片间的凹处，气流冲洗不到，又受涡流作用，易使熔化后的灰粒或未燃尽的油滴沾附在该处，为侵蚀创造了条件。转子主轴在制造过程中虽然通过加工中央孔的方法去除了超标缺陷，但其内部仍是存在一定数目的原始冶金缺陷。利用内窥镜可实现对转子中央孔内壁任意一点的多角度检测，获得清晰的图像，为排除缺陷和一些可疑情况提供了可靠的保证。
                            

The main reason for the thermal erosion of water wall is that the front of water wall on the fire side is washed by air flow, and the ash is not easy to adhere. The concave between the two sides of water wall and the fins can not be washed by air flow, and it is also affected by eddy current, which makes the melted ash particles or unburned oil droplets adhere to it, creating conditions for erosion. In the manufacturing process of the rotor spindle, although the over standard defects are removed by machining the central hole, there are still a certain number of original metallurgical defects in the rotor spindle. The endoscope can be used to detect any point on the inner wall of the rotor central hole from multiple angles and obtain clear images, which provides a reliable guarantee for eliminating defects and some suspicious situations.

锅炉水冷壁管常见的损坏状况有套筒开裂、联箱内壁裂纹、喷水管断裂、喷头失效等问题。转子在运行过程中，中央孔表面及四周承受的切向应力为最大及材料机能的下降，在蠕变—疲惫交互作用下，会在转子中央孔表面及内部原始冶金缺陷附近产生裂纹并扩展。

The common damage conditions of boiler water wall tube include sleeve crack, inner wall crack of header, fracture of spray pipe, nozzle failure and so on. During the operation of the rotor, the tangential stress on the surface and around the central hole is the maximum and the material function decreases. Under the creep fatigue interaction, cracks will appear on the surface of the central hole and near the original metallurgical defects inside the rotor and propagate.