Foreign substance removal apparatus for gas turbine

A foreign substance removal apparatus for a gas turbine, comprising:

• a torque tube;
• a combustor casing having an inner surface enclosing a region of the torque tube;
• a first cooling air passage communicating at one end with a hollow region inside the combustor casing and communicating at another end with an outer surface of the combustor casing in order to move cooling air into the hollow region;
• a first foreign substance collection unit including one of a groove or a slit that is formed in the inner surface of the combustor casing and communicates with the hollow region to primarily filter foreign substances contained in the cooling air passing through the first cooling air passage and the hollow region;
• a second cooling air passage having a first end that communicates with the first cooling pair passage and a second end that extends toward a turbine blade, the second cooling air passage formed in the torque tube in the enclosed region to surround a central axis of the torque tube and to have an incline such that the second end is farther from the central axis than the first end;
• and
• a second foreign substance collection unit that is disposed at the second end of the second cooling air passage and communicates with the second cooling air passage to secondarily filter foreign substances contained in the cooling air introduced through the first cooling air passage.