Bearing detection method, bearing detection system, method for starting gas turbine and system for starting gas turbine

A bearing detection method for supporting fault detection of an air bearing or a mixed bearing formed by the air bearing and a magnetic bearing of a rotor when the rotor is started, comprising:

• starting the rotor to allow the rotor to rotate at a first rotating speed along a first direction, wherein the first direction is a rotating direction when the rotor operates normally, and the first rotating speed is a first calibration value;
• acquiring a first torque, wherein the first torque is an output torque when the rotor rotates at the first rotating speed along the first direction;
• and
• judging the first torque and a torque threshold value, wherein the torque threshold value is a second calibration value, and when the first torque is smaller than the torque threshold value, the air bearing or the mixed bearing is fault-free,
• wherein a further detection is performed on the air bearing or the mixed bearing when the first torque and the torque threshold value are judged and the first torque is greater than or equal to the torque threshold value, wherein the further detection comprises the following steps:
• controlling the rotor to reverse to allow the rotor to rotate at a second rotating speed along a second direction, wherein the second direction is a direction contrary to the first direction, and the second rotating speed is a third calibration value;
• acquiring a second torque, wherein the second torque is an output torque when the rotor rotates at the second rotating speed along the second direction;
• and
• judging the second torque and a torque threshold value, wherein the torque threshold value is the second calibration value, and when the second torque is greater than or equal to the torque threshold value, the air bearing or the mixed bearing has a fault.

A starting method for starting a gas turbine, wherein the gas turbine uses an air bearing or a mixed bearing formed by the air bearing and a magnetic bearing, wherein the method comprises:

• detecting whether the air bearing or the mixed bearing has a fault or not by using a bearing detection method when the gas turbine is started,
• wherein the bearing detection method is for supporting fault detection of the air bearing or the mixed bearing formed by the air bearing and the magnetic bearing, which is of a rotor when the rotor is started, the bearing detection method including:
• starting the rotor to allow the rotor to rotate at a first rotating speed along a first direction, wherein the first direction is a rotating direction when the rotor operates normally, and the first rotating speed is a first calibration value;
• acquiring a first torque, wherein the first torque is an output torque when the rotor rotates at the first rotating speed along the first direction;
• and
• judging the first torque and a torque threshold value, wherein the torque threshold value is a second calibration value, and when the first torque is smaller than the torque threshold value, the air bearing or the mixed bearing is fault-free,
• wherein the starting method further comprises:
• when the air bearing or the mixed bearing is fault-free, entering a speed-raising stage of the gas turbine;
• and
• when the air bearing or the mixed bearing has the fault, reporting the fault, and shutting down the gas turbine.