The large nitrogen fertilizer oil-free food is congratulated, (1) the power adjustment speed increases the secondary oil pressure increase, the low-order oil pressure decreases, and the medium pressure level is extracted and under-reported. The level extraction valve is closed, the low power is reduced, and the speed is reduced.

(2) The steam extraction adjusts the pressure of the first-stage extraction pipe network, and increases the pressure of the high-pressure secondary oil; the medium-pressure low-pressure oil pressure, the addition, and the level of steam extraction decrease + the level of the extraction pipe network decreases, while the unit power does not change. , the level of extraction steam pipe network pressure, plus high pressure medium pressure secondary oil pressure drop; low pressure secondary oil pressure increase high card middle 吒 adjustment and closure; low pressure regulating valve open large stage steam extraction volume reduction + stage extraction steam pipe network pressure reduction. The unit power constant constant steam turbine generator set speed control system fault analysis and treatment Zhao Jiangjie Qilu Petrochemical Company No. Fertilizer Plant, Shandong Zibo 1 Overview Turbine Generator Set 01 is Qilu Petrochemical Company's chemical fertilizer plant air separation plant (1) plant steam balance and power generation Unit.

The whole unit is a product of Siemens AG of Germany. The steam parameter of the steam turbine port is 7.0 river pressure; the steam extraction parameter of temperature 500 is gray power 433. The temperature is 400; the steam extraction parameter is pressure 1.5 such as temperature 220 speed 800, 1 mountain 1. Determine the work. Yu. For 1044 Jia. After the unit is put into production, the speed control synchronizer handwheel system has a series of faults such as load fluctuation, steam extraction, throttle valve, shock oil leakage and oil leakage. In particular, the load fluctuation failure caused the unit load to be lifted, and only the low-load operation was maintained. The safety and stability of the serious threat unit was continuously studied and analyzed, and the cause of the unit load fluctuation was found. Some corresponding measures were taken to make the above The fault is eliminated.

2 Dingyi 1 unit speed control system introduction 301 unit steam turbine speed control system is fully hydraulic, its main structure 1 sliding, high pressure secondary oil, secondary oil, low 1 oil K nitrogen fertilizer 3 load fluctuations analysis load fluctuation is in the unit What happens in the load rise, when the load rises to 25001, it starts to fluctuate. When there is fluctuation, there are 2 steps. The range of fluctuation is large, and the frequency is also high, with an average of 81 times. Since the unit is designed primarily for the balance of process steam, power generation is second. Therefore, before the cause of the failure is found. Set it at 1500, low load to maintain production.

The steam turbine generator changes the parameters such as power by changing the opening and closing of the adjustment system. This is caused by fluctuations in the load of the steam turbine control valve. Reporting the change of the overlap degree of the unit's regulation principle, causing the secondary oil pressure to change, so that the regulating valve is opened or closed to achieve the purpose of regulation. The secondary oil pressure has a counter-effect on the secondary oil pressure, so the secondary oil pressure also changes. Therefore, the failure of the synchronizer will affect the secondary oil pressure. However, in the case where the unit is disconnected from the grid, the synchronizer adjusts the speed to play completely normal; after the grid is connected, the synchronizer is also easy to use during low load operation; only when the load is added to 25001 or more, the load fluctuation occurs. phenomenon. At this point, the re-tuning of the synchronizer can not be called = therefore, the possibility of the synchronizer causing the fault is small, for the sake of stability, the synchronizer is removed, including the stiffness check of its speed-regulating spring, the synchronizer is not found What are the abnormalities of the components. Basically, the cause of the load fluctuation caused by the synchronizer is excluded.

3.3, the degree of unequal rate, the fluctuation of the regulating valve is caused by the fluctuation of the secondary oil pressure; and the secondary oil pressure is several times after the secondary oil pressure is amplified. Therefore, the secondary oil pressure fluctuation will cause a large fluctuation of the secondary oil pressure. The original flash that caused the fluctuation of the secondary oil pressure is several times. The 3.1 grid frequency turbine generator set is used to add or subtract loads when it is disconnected from the grid. When connected to the grid, the unit speed is controlled by the grid frequency. The second pressure is proportional to the one side of the turn.

Therefore, fluctuations in the grid frequency will cause fluctuations in the secondary oil pressure.

But the grid frequency is very stable. In addition, even if it is caused by fluctuations in the frequency of the grid, it will not cause fluctuations in the load of the person. Therefore, the cause of the failure of the grid frequency fluctuation is eliminated.

3.2 Synchronizer In the steam turbine generator set, the role of the synchronizer is to adjust the unit speed when the unit is disconnected from the grid; and to regulate the power when it is juxtaposed with the grid. The specific adjustment process 1 is briefly described as 1 rotating the synchronizer handwheel. It will change the tightening force of the speed regulating spring under it, thus changing the lever angle; and the change of the lever angle will cause the sliding sleeve to move, so that the 1N load of the oil port on the sliding sleeve is full. Large, when the steam turbine is under load, the speed rises too much, which will cause overspeed. If the speed is not equal, Wei is too small. The stability of the adjustment system will be poor, which will easily cause load fluctuations. The adjustment of the speed unequal rate of the unit can be realized by changing the stiffness of the speed regulating spring below the synchronizer. 1. To this end, the speed unequal rate value is appropriately increased, thereby enhancing the stability of the regulating system and avoiding the load. fluctuation. However, after repeated trials, it did not achieve the purpose of eliminating load fluctuations.

34 Radial Drilling Pump Imported oil pressure causes the most direct and most probable research and test of the large fluctuation of secondary oil pressure. Finally, the inlet throttle needle valve of the small radial drilling pump is adopted to reduce the inlet oil pressure. The method of changing the outlet oil pressure of the radial drilling pump, that is, the secondary oil pressure. The results prove that the effect is very obvious. Since then, the unit load fluctuation fault has been fundamentally solved.

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