Kuang YU, Jiaan WANG, Taoying WANG, et al. Cause Analysis of Burst Tube of Final-Stage Superheater Tube in a Power Station Boiler[J]. Power Generation Technology, 2019, 40(2): 192-195.
Kuang YU, Jiaan WANG, Taoying WANG, et al. Cause Analysis of Burst Tube of Final-Stage Superheater Tube in a Power Station Boiler[J]. Power Generation Technology, 2019, 40(2): 192-195. DOI: 10.12096/j.2096-4528.pgt.18149.
the boiler high temperature superheater is easy to cause the deterioration of materials and the decline of material structure and performance
and causes the pipe explosion accident. The causes of burst tube of final-stage superheater tube in a power plant boiler were analysed through macroscopic examination
Brinell hardness test
tensile strength test and metallographic structure test. The analysis results show that final-stage superheater tube operates at high temperature and pressure for a long time
resulting in the carbide enrichment at grain boundary and weaken the grain boundary strength. Under the action of tensile stress
creep cavities and creep cracks occur at grain boundary
resulting in the decrease of durable strength and tensile strength of pearlite heat-resistant steel
and finally the fracture failure occurs.
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references
Purbolaksono J, Ahmad J, Beng L C, et al.Failure analysis on primary superheater tube of power plant[J].Engineering Failure Analysis, 2010, 17(1):158-167.