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Technical measures to avoid the tortuosity of steam turbines

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1 It is necessary to check the large axis misalignment <0.076mm before the turbine is rushed; the large shaft sloshing value does not exceed the original value of 0. 02 mm. When the turbine is started after overhaul; it is necessary to use the dial gauge to block the oil in each bearing. The amount of runout of the measuring spindle on the ring is <0.0254mm.
2 The temperature difference between the upper and lower cylinders of the cylinder (refers to the upper and lower exhaust zones of the high-pressure cylinder of the regulating end, the upper and lower exhaust zones of the intermediate pressure cylinder) > 42 °C The steam turbine unit stops the starting. The inlet temperature of the main steam valve has at least 56 °C superheat.
3 The cold and hot start of the unit shall be carried out according to the “main steam parameters at start-up”, “cold-state rotor heating regulation” and “hot-state recommended value” chart curve.
4 In any case; the first stage steam temperature of the steam turbine is not allowed to be 56°C lower or 111°C higher than the top metal temperature.
5 When the hot state is started; the steam should be sent after the steam seal is sent; it is necessary to be fully hydrophobic before the steam seal is sent; the pipeline can be sent to the steam seal after the water is recognized.
6 It is necessary to have a superheat of more than 14 °C for steam supply and steam supply; the temperature of low pressure steam supply is controlled between 121 and 177 °C.
7 The unit will stop supplying steam to the steam seal before the vehicle is driven.
8 When the steam supply temperature of the high and medium pressure steam seals is less than 150 °C or the temperature difference between the steam seal steam supply and the end wall of the high pressure cylinder is less than 85 °C; check the steam seal water spray should be closed.
9 In the process of starting the unit; according to the "maintenance value of steam turbine speed recommended" "cold rotor heating regulation" "hot state recommended value" curve for warming up; warming time from the medium pressure cylinder inlet steam temperature reaches 260 °C when the beginning of accounting .
10 During the starting process of the unit; a special person shall supervise the oscillation of each bearing of the steam turbine unit; the shaft oscillation of the steam turbine shall be below 0.125mm; when the critical speed is exceeded; the bearing oscillation exceeds 0.1mm or the relative shaft oscillation value exceeds 0.254mm. Immediately stop the brakes. It is forbidden to forcibly pass the critical speed or reduce the speed to warm up.
11 During the operation of the unit, the bearing oscillation does not exceed 0. 03mm or the relative shaft oscillation does not exceed 0. 08mm; when overtaking, it should be tried to eliminate; when the relative shaft oscillation is greater than 0. 254mm, the brake should be stopped, when the bearing oscillation changes ± 0. 015mm Or the relative axis oscillation changes ± 0. 05mm; should find out the reason to try to eliminate; when the bearing oscillation suddenly added 0. 05mm; should stop the brake.
12 According to the "Central Control Operation Regulations"; when it is found that there is steam turbine water impact appearance; immediately stop the brake.
13 All high, low and deaerator water levels should be put into operation and timed experiment; when the heater is found to be leaking; the heater should be stopped and the exhaust check valve should be closed.
14 After the stop, it should be put into the car in time; when the current of the car is larger than normal, sway or have abnormal sound; it should promptly tell the relevant departments and leaders; find out the reasons for timely treatment. If the conflict of the steam seal is severe; The high point of the rotor is placed in the highest position; the closed cylinder is hydrophobic; the temperature difference between the upper and lower cylinders is adhered; the tortuosity of the rotor is supervised; when the tortuosity of the rotor is recognized as normal; then the manual axle 1800 is used to perform the straight shaft. When the vehicle does not move; it is forbidden to use the crane to force When the car is stopped, the car should be temporarily suspended due to the problem of the car; the change of the tortuosity of the rotor should be supervised; when the tortuosity is large; the manual car 1800 should be used; the car should be put into the car in time after the car is normal.
15 During the start, operation and stop of the unit; strictly follow the “Technical measures to avoid steam turbine entering cold steam and cold water”; be careful to prevent steam, cold air, hydrophobic and condensed water from entering the extraction pipe or the leakage pipe when switching the steam-water valves, or The drain pipe comes back to the cylinder.
16 Each shift should be corrected for the deaerator, heater local water level gauge and CRT water level indication value.

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