Mitsubishi Hitachi Power Systems, Ltd.

Koji Ogata

Shunsuke Mizumi

Takeshi Kudo

Noriyo Nishijima

Shinji Oikawa

Tateki Nakamura

Yoshiaki Onda

An exhaust system for a steam turbine provided with an improved annular flow guide in a high or intermediate turbine. The improved flow guide reduces flow turbulence in an exhaust hood and reduces pressure loss to thereby improve turbine plant efficiency. The shape (vertically symmetric) of a flow guideA according to a conventional technology was modified into the shape (vertically asymmetric) of a flow guidesuch that the length of a downstream flow guide portionis greater than that of a upstream flow guide portion. Numerical analyses were performed to find the optimum flow guide occupation ratio of the conventional technology and the corresponding total pressure loss coefficient. The obtained values were used as reference values. Further, the flow guide occupation ratio of the upstream flow guide portionwas set at 0.4 and the flow guide occupation ratio of the downstream flow guide portionwas set at 0.7; at values where the total pressure loss coefficient becomes lower than the reference value. The rectification effect of the flow guide can thus be enhanced.

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Mito, Japan

Koji Ogata