I would like to consult you all regarding some technical details of the major boiler maintenance
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First of all, I would like to ask how the tasks involved in a boiler overhaul are determined? In other words, how are the items that require major maintenance identified on a regular basis? For example, how can one determine that the wall thickness of the rising or descending tube in a boiler has thinned? Was this wall thickness measurement taken when the boiler was shut down as a backup unit, or while it was in operation? How is the wall thickness of boiler tubes usually measured using that method? Is it necessary to disassemble the steam drum for inspection every time it is shut down for maintenance? For drum inspections, in addition to checking for corrosion, scaling, and internal cracks, what other areas need to be given special attention? For internal crack inspection, coloring and ultrasound are commonly used; what methods do people usually employ? Regarding the water wall, I’ve reviewed some information; the main failure modes are thickening and bulging. These can only be detected when the boiler is shut down, right? Is this inspection for the thickening and bulging of the water wall carried out periodically? Or is it discovered and confirmed through some other means or methods? Well, I’ll ask these questions first; there will be other questions as well.
You can ask the manufacturer about this. You can also refer to the internal project documents. Upon completion of the project, there will be three manuals: commissioning, operation, and maintenance. It’s quite thick :) And the manufacturer provides support in terms of repair techniques.
For a major overhaul, a thorough inspection is required. As for the thinning of the tube walls in the rising or descending tubes, it generally occurs with very low frequency. The drum needs to be disassembled for inspection. The water wall must be inspected in its entirety, especially for \"bulging and swelling,\" and the wall thickness should also be checked in areas where wear is present.
There are specific standards in this regard: \"DL-T 748-2001 Guidelines for the Maintenance of Boilers in Thermal Power Plants\" and \"DLT 838-2003 Guidelines for the Maintenance of Equipment in Power Generation Enterprises\". For circulating fluidized bed boilers, the relevant standard is \"DL T 1035.1～6-2006 Guidelines for the Maintenance of Circulating Fluidized Bed Boilers\}. These standards are very comprehensive and detailed, specifying both standard and non-standard items, and cover almost all aspects of boiler maintenance. Follow the standards; don’t worry, you know what I mean