Gas turbine fire detection system including cooling system upstream of aspirating smoke detector, and related method

A system comprising:

• a gas turbine system, the gas turbine system surrounded by an enclosure and including a plurality of fire risk zones;
• and
• a fire detection system, the fire detection system comprising:
• a respective pipe intake port proximate to each of the plurality of fire risk zones, the pipe intake ports within the enclosure;
• a manifold in fluid communication with at least one of the pipe intake ports;
• a first temperature sensor positioned in the manifold;
• a cooling system in the manifold downstream of the first temperature sensor, the cooling system configured to reduce a temperature of a gas flow in the manifold;
• an aspirating smoke detector in the manifold downstream of the cooling system, the aspirating smoke detector configured to draw the gas flow through the manifold and detect smoke in the gas flow;
• and
• a controller in communication with the first temperature sensor and the aspirating smoke detector, the controller configured to generate one of:
• a) a first alarm in response to the first temperature sensor detecting a temperature of the gas flow exceeding a first temperature threshold, and b) a second alarm in response to the aspirating smoke detector detecting smoke in the gas flow.

A system comprising:

• a gas turbine system, the gas turbine system surrounded by an enclosure and including a plurality of fire risk zones;
• and
• a fire detection system, the fire detection system comprising:
• a respective pipe intake port proximate to each of the plurality of fire risk zones, the pipe intake ports within the enclosure;
• at least one manifold in fluid communication with at least one of the pipe intake ports;
• a first temperature sensor positioned in each manifold;
• a cooling system in each manifold downstream of the first temperature sensor, each cooling system configured to reduce a temperature of a gas flow in a respective manifold;
• a valve in each manifold upstream of a respective cooling system;
• an aspirating smoke detector in each manifold downstream of the cooling system, the aspirating smoke detector configured to draw a respective gas flow through a respective manifold and detect smoke in the respective gas flow;
• and
• a controller in communication with each first temperature sensor and each aspirating smoke detector, the controller configured to generate one of:
• a) a first alarm in response to any first temperature sensor detecting a temperature of the gas flow exceeding a first temperature threshold, and b) a second alarm in response to any aspirating smoke detector detecting smoke in the respective gas flow;
• and
• wherein the controller is further configured to close a respective valve and to shut off the aspirating smoke detector in response to the second temperature sensor detecting the temperature of the gas flow in the respective manifold exceeding a second temperature threshold.