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Basic principle of speed governing system of N135 steam turbine

News by ninechip | On 2018-10-22 17:45
 Speed governing system is an important system of steam turbine. It can be said that it is the nerve center system of steam turbine. The equipment of speed governing system mainly includes three parts: hydraulic security system, DEH regulation and steam distribution system, oil supply system.
  The working principle of the security system is shown in the system diagram. It includes emergency blocker flying hammer, reset and blocking device, test switching handle, safety oil locking valve and its action solenoid valve (OST), AST tripping solenoid valve and its test oil circuit, injection solenoid valve and manual valve, safety oil release piston, medium pressure main valve and test solenoid valve, etc.
   The speed governing system adopts a new electro-hydraulic converter, which inputs 50-300 mA current signal and outputs a control oil pressure of 0.1-0.4 MPa. The control oil pressure corresponds to the stroke of the oil motor one by one, so as to control the stroke of four high-pressure valve oil motors, two medium-pressure valve oil motors and two high-pressure main valve oil motors. The safety oil pressure acts on the critical relay, the critical step of the actuator and the control of the oil pressure.
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