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Roy, Malabika
- Failure Analysis of High Strength T91 Boiler Tubes used in Thermal Power Plant: A Case Study
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Authors
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1 Materials Technology Division, Central Power Research Institute, Bangalore-560 080, IN
1 Materials Technology Division, Central Power Research Institute, Bangalore-560 080, IN
Source
Power Research, Vol 12, No 2 (2016), Pagination: 363-370Abstract
A power generating utility of 600 MW has reported the failure of boiler tubes after a service life of 265 hours against the design life of 25-30 years. The failure of tubes was reported in Re-heater Inlet Coil tubes which were made up of high strength material alloy of SA 213 T91 grade. These boiler tubes were operating under a high temperature and pressure. The material used for re-heater and super-heater boiler tubes should have enough creep strength to sustain at high temperature and pressure. Even though T91 grade steel has superior quality of metallurgical properties in comparison to low alloy existing material like T11, T12 and T22, T91tube was failed in a short duration. This paper describesthe investigation of the failure of high strength T91 gradereheater tubes in a coal fired thermal power plant. The failure investigation covers visual inspection, dimensional measurement, hardness mapping, oxide scale measurement, microstructural studies, and SEM and EDX analysis of the failed tubes. The analysis reveals that Tube No-3 of re-heater boiler tube failed due to short term overheating and other tubes failed due to secondary damage caused by steam impingement.Keywords
Re-heater Boiler Tube, Visual Inspection, Grade Identification Of Alloy, Dimensional And Hardness Measurement, Oxide Scale Measurement, Microstructure Analysis- Assessment of Water Wall Tubes of a Fossil Fuel Fired Thermal Power Plant
Abstract Views :194 |
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Authors
Affiliations
1 Engineering Officer, Central Power Research Institute, Bangalore - 560 080, IN
2 JRF, Central Power Research Institute, Bangalore - 560 080, IN
3 Joint Director, Central Power Research Institute, Bangalore - 560 080, IN
1 Engineering Officer, Central Power Research Institute, Bangalore - 560 080, IN
2 JRF, Central Power Research Institute, Bangalore - 560 080, IN
3 Joint Director, Central Power Research Institute, Bangalore - 560 080, IN
Source
Power Research, Vol 11, No 4 (2015), Pagination: 757-772Abstract
Boilers being the heart of any steam generating system, failure of its components,will lead to forced outages of the plant, resulting in heavy economic losses in terms of non–availability of plant.Periodic inspection and assessment of boiler tubes has a great impact on the generation of power and economic status. The assessment of boiler tubes minimizes the risk of forced outage of the power plant. This paper presents the assessment of water wall tubes of thermal power plant to avoid any forced outage due to failure of water wall tubes. The assessment includes non-destructive, destructive and failure analysis of failed tubes. The periodic non-destructive evaluation is performed for the boiler tubes for generation of data for assessing and deciding the integrity of the boiler tubes. Destructive and failure analysis of failed tubes gives the information and helps in identifying the ischolar_main cause of failure and to take preventive action for avoiding forced outage.Keywords
Water Wall Tube, Forced Outage, Corrosion, Erosion, Deposited Product, Scanner, Hydrogen Damage, Microstructure and EDX Analysis- Study on the effects of coal-ash-slag deposition on boiler tubes in a coal-fired thermal power plant
Abstract Views :175 |
PDF Views:0
Authors
Affiliations
1 Materials Technology Division, Central Power Research Institute, Bangalore, IN
1 Materials Technology Division, Central Power Research Institute, Bangalore, IN