STEAM PIPE CONNECTION STRUCTURE, STEAM TURBINE PLANT WITH SAME, AND STEAM PIPE COOLING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a steam pipe connection structure capable of appropriately cooling not only flange sections but also bolts.SOLUTION: There is provided a steam pipe connection structure 30B connecting between flange sections 34a of steam pipes 24 in which steam flow by a plurality of bolts 40, comprising a cover part 50 for covering the respective flange sections 34a from outside, which is connected to a cooling air introduction pipe 54 for introducing cooling air and a cooling air discharge pipe 60 for discharging the cooling air. Furthermore, the steam pipe connection structure comprises: a recirculation pipe 62 for connecting the cooling air introduction pipe 54 to the cooling air discharge pipe 60; and a control valve 64 for adjusting a flow rate of the cooling air flowing in the recirculation pipe 62.SELECTED DRAWING: Figure 4