The demand for high-efficiency and low-cost steam turbines for power generation accompanied by lower construction and operational costs is increasing due to the rise of environmental issues such as energy conservation and CO2 emissions. Mitsubishi Heavy Industries, Ltd. (MHI) has developed a series of integral shroud blade (ISB) exhaust end blades that have been successfully applied to actual turbines designed for high efficiency, high reliability, and rational cost reduction. Levering this successful experience, MHI has recently completed the development and verification of the next generation of 3,600-rpm 50-inch and 3,000-rpm 60-inch steel exhaust end blades. Based on this development, MHI has also developed new large-capacity single-casing reheat turbines with other advanced technologies such as high-efficiency reaction blade, welded rotor, advanced seals and high performance bearing to achieve higher efficiency and more compact design. The single-casing reheat turbines with larger exhaust area can be applied to the condition where the two-casing turbine with double exhaust low-pressure turbine was applied. Especially they are suitable for the gas-turbine (GT) combined-cycle plant with one-on-one configuration of MHI’s latest GT (J-series). They are also suitable for all the one-on-one and two-on-one combined cycle configuration of MHI’s F and G series GT. In addition to the compact single-casing design, the axial exhaust enables installation of the condenser on the same floor level. Compared with the double flow with the condenser installed under the ST, it results in lower initial cost. Higher pressure recovery in exhaust hood as well as higher performance is additional advantages. The turbine with axial exhaust also can be connected to GT and generator in single shaft arrangement via a synchro-self-shifting (SSS) clutch. This article describes the design features of the world’s largest single casing reheat steam turbine with ultra-long exhaust end blades.
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