Browsing by Author "Seetharamu, S."

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Enhancing energy efficiency of auxiliary power system in a 210 MW coal fired power plant through energy efficiency
(2010) Mandi, R.P.; Seetharamu, S.; Yaragatti, Udaykumar R.
This paper describes the results of energy conservation measures in various thermal power plants spread over the country. Energy savings in various major auxiliaries are summarized here with improved performance. Staggering of auxiliary loads, reduction in hydrodynamic resistance of pipes and ducts, adoption of new energy efficient technologies, efficient control techniques, reduction in furnace ingress and monitoring of coal size at mill inlets will lead to substantial amount of energy savings. The energy conservation schemes are economically attractive with a break even period of 1 to 5 years. �2010 IEEE.
Enhancing energy efficiency of auxiliary power system in a 210 MW coal fired power plant through energy efficiency
(2010) Mandi, R.P.; Seetharamu, S.; Yaragatti, U.R.
This paper describes the results of energy conservation measures in various thermal power plants spread over the country. Energy savings in various major auxiliaries are summarized here with improved performance. Staggering of auxiliary loads, reduction in hydrodynamic resistance of pipes and ducts, adoption of new energy efficient technologies, efficient control techniques, reduction in furnace ingress and monitoring of coal size at mill inlets will lead to substantial amount of energy savings. The energy conservation schemes are economically attractive with a break even period of 1 to 5 years. Â©2010 IEEE.
High temperature tribological studies of cold sprayed nickel based alloy on low carbon steels
(Elsevier Ltd, 2019) Padmini, B.V.; Mathapati, M.; Niranjan, H.B.; Sampathkumaran, P.; Seetharamu, S.; Ramesh, M.R.; Mohan, N.
The boiler steels of grades SAE213 T11 and T22, find extensive applications in heat exchanger tubes, paper and pulp, chemical industries and refineries. Further, these steels are also used in shafts, cylinders, bearings, and in automotive transmission parts and these aspects are less explored. They experience low wear life in specific components, both at room and slightly higher temperature regimes. In order to protect them from these damages, coatings are deployed involving many techniques like HVOF, Plasma spray, Cold spray etc. so that the life of the components get extended. In cold spray coatings, the powders are fed at very high impact velocities of up to 1200 m/s on the substrate and undergo plastic deformation during the impact. There is no oxidation of the powder takes place during the process, as the coating is done at very less temperature and this is one of the lead characteristic of cold spray technique. This particular work mainly focuses on evaluating the tribological behaviour of nickel based super alloy powder on T11 and T22 low alloy steels by cold spray method, using pin on disc machine both at room temperature as well as at 200, 300 and 400 Â°C. The associated tests such as hardness, porosity, and microstructure have been undertaken to support the wear data. The wear damage assessment has been carried out using scanning electron microscope to arrive at the mechanism and also to give credence to the wear data. Â© 2019 Elsevier Ltd.
The influence of microwave sintering on the tribological performance of powder metallurgy based aluminum cenospheres composites
(2015) Ananda, Kumar, M.G.; Seetharamu, S.; Sampath, Kumaran, P.; Nayak, J.
The Metal Matrix Composites (MMCs) especially Aluminum based systems have unique advantages of having superior mechanical, chemical and electrical properties, in addition to light weight and high stiffness. In this work, composites comprising of Aluminum with varied concentrations of Cenospheres as reinforcement was produced by Powder Metallurgy (PM) route. The densification of the composites was effected both by conventional and Microwave (MW) sintering techniques. The microstructures of the sintered samples were observed through scanning electron microscope (SEM) and phases by x ray diffraction technique (XRD), followed by evaluation of tribological parameter namely slide wear behavior and solid particle erosion resistance. The densities and the Brinell hardness values for the samples were also evaluated. The results showed that microwave sintered samples exhibited higher hardness, lower erosion and slide wear loss. � (2015) Trans Tech Publications, Switzerland.
Study on the Material Engineering aspects of Microwave sintered Aluminum– Cenospheres Composites
(2016) Ananda Kumar, M. G.; Nayak, Jagannatha; Seetharamu, S.
The thesis brings out the findings from the study undertaken on development of Aluminium based Metal Matrix composite through Powder Metallurgy route. The composite has been fabricated reinforced with various volume percentages of Fly ash Cenospheres particulates ranging from 0 to 50 vol %. The densification of the composites has been achieved through a non conventional sintering route known as Microwave sintering which is different from the well known conventional processing routes. The microwave sintering process appears rapid and economical. The Aluminium composites reinforced with Cenospheres and sintering through Microwave sintered composites have been later characterized for physical properties such as Density, Porosity, Hardness and Water Absorption, Chemical characteristics and Morphology of the synthesized composites and that of the raw materials through Scanning Electron Microscopy and Energy Dispersive X-ray Fluorescence methods. The Phase Analysis of the composites has been carried through Powder route X-ray Diffraction. The composites have also been studied for Mechanical properties such as Compression Strength with Finite Element Analysis and Modulus of Rupture. The composites have been studied for Tribological properties such as Wear and Erosion Resistance, Thermal properties such as Co-efficient of Thermal Expansion, Thermal Shock Resistance and Fusion Temperatures. The above test results have been compared with the results of conventionally prepared AMCs. The study on the various properties on the PM based Aluminium Cenospheres composites sintered in Microwave at 6650C have indicated that Apparent Porosity was about 35% compared to conventionally sintered ones which was around 40.7%. The Bulk Density was seen to reduce from 2.2 to 1.75 g/cc and the BHN values were found decreasing from 46 to 24% for the Microwave sintered samples. The conventionally sintered sample showed Bulk Density reducing from of 2.1to 1.75 g/cc and BHN values were found decreasing from 46 to 24. The BHN values were better than the conventional ones by about 26 %. The CTE of the composites decreased from 25.6 to 7.4 x 10-6/0C with increase in cenospheres content from 0 to 50 vol % forx the conventionally sintered composites. For the microwave sintered composites, the CTE of the composites decreased as the cenospheres content from 25.6 to 3.6 x 10- 6/0C which is much lower than the conventionally sintered samples by 51%. The microwave sintered composites showed lesser erosion loss by about 12-15% compared to conventionally sintered samples. The slide wear data shows that conventionally sintered samples has higher slide wear losses compared to conventionally sintered ones by about 86%. The Flexural strength of the conventionally sintered composites was seen decreasing from 52 to 8.8 MPa while Flexural strength of microwave sintered composites were decreasing from 71.9 to 31.5 MPa with increase in cenospheres content from 10 to 50 vol %. MW sintered was better by about 40% in Flexural Strength compared to the conventionally sintered composites. The Compression strength of the composites containing Cenospheres from 10 vol. % to 50 vol. % was found to decrease from 140.3 to 71.7 MPa with the increase in Cenospheres content, for microwave sintered samples. For the conventionally sintered composites the strength reduced from 140.3 to 71.7 MPa. The compressive strength of microwave sintered samples was more by 17.4 % compared to the conventionally sintered samples. Aluminium metal matrix composites can be fabricated through powder metallurgy route sintered in microwave sintering which is found to be adoptive & effective rapid sintering method. It is possible to fabricate Aluminium Cenospheres ‘Syntactic Foams’ through powder metallurgy microwave sintering and the properties for the same match with those materials for applications in automotives.
The influence of microwave sintering on the tribological performance of powder metallurgy based aluminum cenospheres composites
(Trans Tech Publications Ltd ttp@transtec.ch, 2015) Ananda Kumar, M.G.; Seetharamu, S.; Sampath Kumaran, P.; Nayak, J.
The Metal Matrix Composites (MMCs) especially Aluminum based systems have unique advantages of having superior mechanical, chemical and electrical properties, in addition to light weight and high stiffness. In this work, composites comprising of Aluminum with varied concentrations of Cenospheres as reinforcement was produced by Powder Metallurgy (PM) route. The densification of the composites was effected both by conventional and Microwave (MW) sintering techniques. The microstructures of the sintered samples were observed through scanning electron microscope (SEM) and phases by x ray diffraction technique (XRD), followed by evaluation of tribological parameter namely slide wear behavior and solid particle erosion resistance. The densities and the Brinell hardness values for the samples were also evaluated. The results showed that microwave sintered samples exhibited higher hardness, lower erosion and slide wear loss. Â© (2015) Trans Tech Publications, Switzerland.