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.
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.
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.