Gas guiding device and facility including the same

A gas guiding device which is connected to an axial-flow rotary machine including a rotating shaft rotating around an axis, an inner casing having a tubular shape around the axis, and an outer casing having a tubular shape around the axis and forming a flow passage for gas between the outer casing and an outer peripheral side of the inner casing, and which guides the gas between the gas guiding device and the axial-flow rotary machine, the gas guiding device comprising:

• a first connection part connected at an end of the tubular outer casing and having an annular shape around the axis;
• a second connection part connected at an end of the tubular inner casing and having an annular shape around the axis;
• a main body part which is combined with the first connection part and the second connection part to form therein a flow passage having an annular shape around the axis, and has an opening formed on the radially outside relative to the axis;
• and
• a support part supporting the main body part, wherein
• the first connection part has a first joint which has an annular shape around the axis and allows movement of the main body part relative to the outer casing, and
• the second connection part has a second joint which has an annular shape around the axis and allows movement of the main body part relative to the inner casing.