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800 MWe, a steam pressure of 300 kg/cm 2 and a steam temperature of 700°C. Theexpertise of IGCAR on materials technology developed for nuclear power plants waseffectively used to develop advanced materials for the supercritical technology underthis consortium project.In his presentation, Mr. Jayakumar detailed the technical aspects of these materials,which include Super 204HCu stainless steel tubes and Inconel 617 alloy tubes, customengineeredto suit the required parameters. The 304HCu stainless steel tubes developedindigenously met the specified chemistry, tensile properties, grain size and hardnessrequirements, and were qualified by ultrasonic, flaring and flattening tests. The tubesmeet the requirements of American Society of Mechanical Engineers (ASME) standardsand non-destructive examination (NDE). The stage-wise characterization helped understandthe material’s behaviour during metal processing and to optimize the final heattreatment to achieve the desired microstructure and mechanical properties. Weldingprocedures have been developed to weld the 304HCu tubes using ER625 and ER617alloys. The welded joints passed radiography and mechanical tests as per ASMEsection IX. Technical issues with the extruded Alloy 617M tubes were solved to obtainhigh-quality tubes with required specifications.Mr. R. Kumar, General Manager, BHEL, made a presentation on “Advanced FossilFuel Technology Development at BHEL” under the Mission Programme for Adv-USCTechnology research project. The trends in unit sizes and cycle parameters of coalfiredboilers are reflected in Table 1-3.Table 1-3: Unit sizes and parameters of BHEL’s coal-fired boilersUnite size SHO pressure SHO/RHO Year of(kg/cm 2 ) temperature (°C) introduction60/70 MW 96 540 1965110/120 MW 139 540/540 1966200/210 MW 137/156 540/540 1972250 MW 156 540/540 1991500 MW 179 540/540 1979179 540/568 1985600 MW 179 540/568 2008660 MW 256 568/596 2008700 MW 256 568/596 2010800 MW 256 568/596 2008The talk covered technology development of power plant equipment at BHEL Tiruchirapalliover the years. Of the total installed power generation capacity of India, 62 percent is contributed by BHEL power plants. Improved efficiency could be achieved byincreased operating temperature and pressure.Mr. Kumar listed the clean coal technology options as: pulverized coal combustion,fluidized bed combustion, circulating fluidized bed combustion, combined cycle gasturbine/co-generation and integrated gasification combined cycle.10