Failure case studies of SA213-T22 steel tubes of boiler through computer simulations |
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| Authors: | J Purbolaksono J Ahmad A Khinani AA Ali AZ Rashid |
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| Institution: | 1. Department of Mechanical Engineering, Universiti Tenaga Nasional, Km 7 Jalan Kajang-Puchong, Kajang 43009, Selangor, Malaysia;2. Kapar Energy Ventures Sdn Bhd, Jalan Tok Muda, Kapar 42200, Malaysia;1. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Iran Power Development Company (IPDC), Tehran, Iran;1. Wroclaw University of Science and Technology, Faculty of Mechanical and Power Engineering, Department of Boilers, Combustion and Energy Processes, 27 Wybrzeze Wyspianskiego St, 50-370 Wroclaw, Poland;2. PGE Group Conventional Power Generation, 1 Ciep?ownicza St, 31-587 Kraków, Poland;3. AGH University of Science and Technology in Kraków, The Faculty of Mechanical Engineering and Robotics, Department of Power Systems and Environmental Protection Facilities, 30 Mickiewicza St, 30-059 Kraków, Poland;1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Materials Engineering Group, Pardis College, Isfahan University of Technology, Isfahan 84156-83111, Iran;1. Institute of Metal Technology, Datang Northwest Electricity Research Institute, Xi’an 710021, China;2. MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | Increased temperature and decreased hardness values of the tube metal and development of oxide scale on the inner surface of boiler tubes over prolonged period of time are typical problems in power plants. Appropriate life assessments or condition monitoring of boiler tube should be carried out from time to time. Computer simulations may economically support the post-failure assessment method, i.e. visual inspections, metallurgical examinations and mechanical strength measurements. However, estimations obtained from the simulations may provide an advanced warning to take preventive actions prior to failure. In this work two failure cases of the reheater and superheater tubes made of a typical material of SA213-T22 steel are evaluated. As the oxide scales are increasingly developed on the inner surface, the increasing of temperature and decreasing of hardness value in tube metal for both cases are determined. The remnant life estimations are then made in the form of creep cumulative damages. |
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