| 摘要 |
PROBLEM TO BE SOLVED: To obtain a steam plant with a simple structure capable of smoothly supplying two kinds of steam having temperature difference without being influenced by pressure of blade lines, suppressing thermal stress of the blade lines, improve in turbine performance compared to conventional technique and in strength, requiring no changeover of high and low temperature steam in total operation range. SOLUTION: In this steam plant, a steam turbine is driven by utilizing low temperature steam and high temperature steam with temperature kept higher than the former. In such a steam plant, the steam turbine has, in its turbine casing, a low temperature steam chamber for introducing the low temperature steam and a high temperature steam chamber for introducing the high temperature steam, independently on each other. A low temperature steam supply port is formed for injecting the low temperature steam from the low temperature steam chamber to a first blade line. A high temperature steam supply port is formed for injecting the high temperature steam from the high temperature steam chamber to the first blade line.
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