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This post was last edited by qy576100527 on 2017-6-1 22:59. System Startup (II) – Individual Testing of the Turbine. I. Inspection Items: 1. Verify that the circulating water pressure is greater than 0.35 MPa, the electrical supply is normal, the medium-pressure steam pressure is greater than 3.3 MPa, the low-pressure steam pressure is greater than 0.5 MPa, the instrument air pressure is greater than 0.45 MPa, and that all conditions necessary for testing are met, including those related to deionized water. 2. Open the root valves of all pressure gauges. 3. The fuel tank level is normal, and the fuel quality meets the requirements. 4. Open the cooling water inlet valve and the exhaust valve of the surface condenser; close them after exhausting the air, and open the outlet valve. The cooling water inlet valve and the exhaust valve of the gas-sealed condenser are opened; after the air is exhausted, they are closed, while the outlet valve is opened. 5. Confirm that the electrical and instrument interlock system has been successfully tested. 6. The accumulator is filled with nitrogen and meets the requirements. 7. Oil washing is satisfactory, and steam purging is satisfactory. 8. The auto-start test of the auxiliary oil pump passed. 9. The static test of the speed control system passed. 10. The self-start test of the condensate pump passed. 11. The vacuum system passed the tightness test. 12. The exhaust check valve operates smoothly. (While driving, slightly open the external shut-off valve; after the speed reaches the rated value, use control 505. Do not supply oil to the exhaust valve, and open it for exhaust only when the pressures on the front and back are equal.) II. Preparatory work before testing 1. Start the oil system 1) Start the oil injection pump, and once it is operating normally, close the manual valve for adjusting the oil flow. 2) Open the high-level fuel tank filling valve, fill it with fuel, and then close it. 3) Adjust the oil pressure in the main lubricating oil pipeline to 0.25 Mpa (G), and control the control oil pressure at 0.85–0.9 Mpa (G). 4) The auxiliary oil pump is set to automatic mode. 2. Start the condensate system: 1) Start the condensate pump and set the surface condensate level to automatic control; 2) Put the auxiliary condensate pump in automatic mode. 3. Start the turning gear and supply sealing steam; maintain a pressure of around 18 Kpa in summer, and a slightly higher pressure in winter. 4. Pipe warming (can be carried out separately in advance): 1) Low-pressure pipe warming at 0.2～0.3 Mpa (G), for 20 minutes. 2) Pressure rise for pipe warming: 0.2～0.3 Mpa (G)/min. 3) Pay attention to drainage during pipe warming. 5. Create a vacuum (by pumping and condensation, or using a gas-sealed condenser). III. Commissioning of the turbine unit: 1. Verify that the pipes are at the proper temperature, at 390°C and 3.55 Mpa (A). 2. Evacuate the surface condenser to 0.01 Mpa (A), (with a maximum vacuum level of 0.08 MPa). 3. Stop the barring. 4. With the impulse rotor at 500 rpm, conduct the test on the trip button of the speed control device’s trip mechanism as well as the test on the 505E stop button. 5. Restart the machine at 500 rpm, and during the low-speed warm-up period, check the following parameters: shaft vibration, shaft displacement, temperature, etc., as well as listen to the sounds coming from the machine. 6. Increase the speed in accordance with the acceleration curve to the rated speed of 7856 rpm/min. 7. Precautions for increasing speed 8.1) When exceeding the critical speed of 3000–4000 rpm rapidly and vibration levels are high, stop increasing the speed. (Turbine at 3000 rpm, steam drive at 4300 rpm.) ) 9.2) Pay attention to checking parameters such as shaft vibration, shaft displacement, and temperature (oil temperature, shaft temperature). 10. Perform the overspeed offline test twice. 11. Re-raise the speed to the maximum continuous speed of 7856 rpm, and conduct a two-hour operation test. 12. Stop the machine by cutting off power and measure the self-rotation time. 13. Perform post-stopping procedures: the oil system should operate for more than 8 hours, the cranking system should operate for more than 8 hours, and the condensation system should operate for 2 hours.