Can a coal-fired boiler with a deformed water wall still be used normally?
Thread Content
We are using a 35-ton coal powder boiler; due to operational errors, a deflagration occurred during ignition, causing partial deformation of the membrane water wall. The maximum deformation in the most affected areas reached 10 cm, with the water wall having a height of 3.8 meters. Can it be simply repaired and used normally during the maintenance process? I would appreciate suggestions from experienced colleagues!
Based on my experience, in the situation described by the poster, I have calculated that the bending deformation of the water wall tubes is only 2.63%; and if there are no other defects, the water wall tubes of this boiler can be used. For such defects, it is necessary to replace the water wall tubes when the degree of deformation reaches a certain value; the Boiler Bureau of the former Ministry of Labor had clear regulations on this. Since I haven’t been working in this specific type of inspection and testing technology for nearly 20 years, I can’t remember the exact figures. Since I am outside right now, I am also unable to find the relevant regulations. Please wait for a while before checking my reply, OP!
Thank you! Could you give me the chance to learn about the standard number or standard?
Article 21 of the Rules for Periodic Inspection of Boilers: Treatment of deformation and bulging: The bending degree of straight pipes shall not exceed 2% of the pipe length, and shall not be more than 90% of the inner diameter of the pipe； The tube should be replaced if there are cracks at the joints or bends, or other serious defects such as overburning.
I checked online, and the \"Rules for Periodic Inspection of Boilers in Use\" issued by the Ministry of Labor in 1988 have been repealed. The new version was issued by the Bureau of Quality and Technical Supervision on September 3, 1999, via document No. Zhiji Jian Guo Fa [1999] 202, under the title \"Rules for Periodic Inspection of Boilers\" (hereinafter referred to as the \"Rules\"); these Rules came into effect on January 1, 2000. But I couldn’t find it online. Does anyone know?