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Kumar, R. K.
- High Temperature Erosion Resistance Characteristics of Boiler Tube Materials of Thermal Power Plant
Abstract Views :175 |
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Authors
Affiliations
1 Central Power Research Institute, Bangalore-560080, IN
2 Senior Research Fellow, Central Power Research Institue, Bangalore-560080, IN
3 UBDT College of Engineering, Davangere-577002, Karnataka, IN
1 Central Power Research Institute, Bangalore-560080, IN
2 Senior Research Fellow, Central Power Research Institue, Bangalore-560080, IN
3 UBDT College of Engineering, Davangere-577002, Karnataka, IN
Source
Power Research, Vol 12, No 3 (2016), Pagination: 603-612Abstract
The boiler tubes of Indian thermal power plants are exposed to severe erosive ash environment leading to continuous metal wastage and failure. The erosion resistance of the boiler tube material is affected by hardness, particle velocity, impact angle, particle size and metal temperature. The parameters affecting the erosion resistance properties are required to be evaluated in the laboratory under accelerated condition using a tunnel type erosion test rig. The present paper highlights the results of high temperature erosion of five different widely used boiler tube materials such as T11, T91, T22, carbon steel, and SS304 have been brought out in terms of their erosion resistance properties under different temperature conditions. The properties are compared with that of room temperature erosion resistance properties. The erosion resistance characteristics were studied for different velocity and impact angles around the circumference of the boiler tube. The evolution of surface roughness corresponding to different angles around the boiler tube, upon erosion, in comparison with the carbon steel tube, is presented.Keywords
Boiler Tube, Erosion, Superheater, Reheater, Surface Roughness, Impact Angle- Condition Assessment of Generator Rotor Shaft of 108 MW Hydro Plant Through Phased Array Ultrasonic Technique and Estimation of Remaining Life Through Finite Element Analysis
Abstract Views :170 |
PDF Views:0
Authors
Affiliations
1 Central Power Research Institute, Bangalore-560080, India
2 Senior Research Fellow, Central Power Research Institute, Bangalore, IN
1 Central Power Research Institute, Bangalore-560080, India
2 Senior Research Fellow, Central Power Research Institute, Bangalore, IN
Source
Power Research, Vol 12, No 3 (2016), Pagination: 613-624Abstract
The Condition Assessment of Generator rotor shaft of typical 108MW plant has been carried out involving the application of advanced Phased Array Ultrasonic Technique (PAUT)to quantify the volumetric nature of the defects in the rotor. This technique involves mapping of the entire rotor volume in different segments and layers using multiple ultrasonic sensors. The imaging of defects in the rotor shaft was carried out in four different diameter sections 558 mm, 610mm, 737 mm and 914 mm. The scanning of entire shaft geometry regions was done following different patches from top to bottom portion of the shaft by PAUT and analysis of individual scanning results for evaluation of crack size, position inside the rotor geometry and orientation. The critical defects identified by this technique with their locations and orientation inside the rotor has been presented. The stress and fatigue life of the shaft under defect free conditions have been carried out by finite element analysis using the commercial code Fe-SafeTM. The calculation of remaining life of the rotor shaft was carried out based on the principle of fracture mechanics using the code ZENCRACKTM. The results of the crack growth rate data of critical cracks close to the surface were presented.Keywords
Hydro Turbine Generator, Phased Array Ultrasonic Inspection, Stress Analysis- CFD Modelling of the Blended Coal Combustion in A Typical 210MW Indian Boiler
Abstract Views :182 |
PDF Views:0
Authors
Affiliations
1 SRF, Materials Technology Division, Central Power Research Institute, Bengaluru-560080, IN
2 Joint Director, Materials Technology Division, Central Power Research Institute, Bengaluru-560080, IN
3 Additional Director (Retd.), Materials Technology Division, Central Power Research Institute, Bengaluru-560080, IN
1 SRF, Materials Technology Division, Central Power Research Institute, Bengaluru-560080, IN
2 Joint Director, Materials Technology Division, Central Power Research Institute, Bengaluru-560080, IN
3 Additional Director (Retd.), Materials Technology Division, Central Power Research Institute, Bengaluru-560080, IN
Source
Power Research, Vol 12, No 3 (2016), Pagination: 625-636Abstract
The computational fluid dynamics (CFD) assessment was carried out for the combustion of pure Indian coal and the blends of Indian/imported coals at various proportions in a typical 210 M We Indian boiler. The input fuel mass flow rate was calculated in various cases to give the same thermal input to the boiler. The various sub models used for the CFD assessment has been described in the paper. The velocity and temperature profiles of the gas phase, combustion profile of the particles, heat flux distribution to the walls of the boiler and also the thermal efficiency of the boiler were assessed in the present work. It was found that the particle and fluid dynamics play a major role in the heat flux distribution in the boiler. The Indian and imported coal blend proportion of 80/20 showed good thermal efficiency compared to the pure Indian coal and other blend proportions.Keywords
Blended Coal, CFD, Indian Boiler, Heat Flux Distribution, Pre-mixed Blending- Influence of Nickel on Abrasion and Erosion Wear Behavior of Thin and Thick Section Permanent Molded Austempered Ductile Iron for Wind Turbine Hubs
Abstract Views :179 |
PDF Views:0
Authors
Affiliations
1 Department of Mechanical Engineering, CMR Instituteof Technology, Bangalore, IN
2 Central Power Research Institute, Bangalore - 560 010, IN
1 Department of Mechanical Engineering, CMR Instituteof Technology, Bangalore, IN
2 Central Power Research Institute, Bangalore - 560 010, IN
Source
Power Research, Vol 9, No 2 (2013), Pagination: 305–310Abstract
The influence of 2.0% nickel on thin and section permanent molded austempered ductile iron samples were investigated for abrasion and erosion behavior. The section sizes of samples were varied at two levels viz. 25 mm and 50 mm. Wind turbine hubs which were subjected to wear and erosion were made from thin and thick section PMADI castings. The austempering temperature and time were optimized for improved wear behavior and strength at 3000 C for 60 mins. Nickel additions showed about 7% improvement in the wear resistance of thin section PMADI samples over unalloyed PMADI samples. For the purpose of comparison, sand-cast austempered ductile iron was also evaluated for abrasion, erosion resistance. Thin section (25 mm) PMADI samples subjected to austempering at 3000 C for 60 mins showed improved abrasion and erosion behavior in addition to higher strength values over thick section (50 mm) PMADI and sand cast ADI samples. Further these data were analyzed with structure property correlation and were well supported by light photomicrographs.Keywords
PMADI, Thin/thick section, Abrasion\erosion and Wind turbine hubs- Conversion of Biomedical Wastes to Energy by Plasma Technologies
Abstract Views :77 |
PDF Views:0
Authors
Affiliations
1 Central Power Research Institute, Bengaluru – 560012, Karnataka, IN
1 Central Power Research Institute, Bengaluru – 560012, Karnataka, IN
Source
Power Research, Vol 17, No 2 (2021), Pagination: 75-80Abstract
The Biomedical Wastes (BMW) include variety of materials like plastics, radioactive elements, metals, infectious biomolecules, etc which are hazardous and pose potential health risk to the people when they are directly released to environment. There are many technologies for treating biomedical wastes like incineration, steam sterilisation before landfilling, etc. The plasma gasification is the state of art technology for the safe disposal of BMW and also convert them to energy. The plasma gasification operates at very high temperatures and the conversion percentage is relatively high compared to any other gasification technologies. The concept of plasma gasification for BMW and the other techno economical aspects are discussed in this paper.Keywords
Biomedical, Biomedical Waste, Plasma Gasification, Microwave, Waste to EnergyReferences
- Messerle VE, et al. Processing of biomedical wastes in plasma gasifier. Waste Management. 2018; 79(2018):791–9. https://doi.org/10.1016/j.wasman.2018.08.048 PMid:30343813
- Guidelines for Handling of Bio Medical Wastes for Utilisation, CPCB, India; 2019.
- Guidelines for handling, treatment and disposal of waste generated during treatment/diagnonsis/quarantine of COVID-19 patients, CPCB, India; 2020
- Byun Y, Cho M, Hwang S-M, Chung J. Thermal plasma gasification of municipal solid waste. Gasification for Practical Applications; 2012. p. 183–210.
- Plasma gasification commercialization [Internet]. Available from: https://en.wikipedia.org/wiki/Plasma_gasification_commercialization
- Plasma gasification. [Internet]. Available from: https://en.wikipedia.org/wiki/Plasma_gasification