Large nitrogen fertilizers for secondary oil-free food, (1) Increase in power regulation speed Increase secondary oil pressure increase in drafts Lower oil pressures in manuscripts Reduced draft pressure in medium-pressure stages Extraction and underreporting. Stage extraction steam control valves are all turned off at low power, and the steam extraction amount is changed.
(2) The extraction steam regulates the pressure of the first-stage extraction pipeline network, and the secondary oil pressure increases with the increase of the secondary pressure; the medium-pressure and low-pressure secondary oil pressure, plus, and the level of extraction steam reduce the pressure of the +stage extraction pipeline network, while the power of the turbine remains unchanged. , Level extraction pipe network pressure, plus high pressure medium pressure oil pressure drop; low-pressure secondary oil pressure increase in the high card to adjust the small; low pressure control valve to open the large-scale extraction of steam to reduce the level of extraction steam pipe network pressure. The fault analysis and treatment of the power-invariable turbine generator set speed control system of the unit Zhao Jiangjie No. 1 Chemical Fertilizer Plant of Qilu Petrochemical Company, Shandong Zibo 1 Overview The steam turbine generator unit 01 is Qilu Petrochemical Company's first fertilizer plant air separation plant (1) plant steam balance and power generation The crew.
The entire unit is a product of Germany's Siemens Company. Its steam turbine parameters for driving the turbine mouth is a pressure of 7.0 rivers; the temperature of the 500th steam extraction parameter is gray force 433. temperature 400; the level of extraction steam parameters is pressure 1.5, such as the temperature 220, the speed is 800, and 1 mountain. 1. Determined power. Yu. For 1044 Jia. After the unit was put into operation, there was a series of failures such as load fluctuations in the speed regulator synchronizer handwheel system, oil leakage from the oil extractor in the exhaust valve, etc. In particular, the load fluctuations in the system have caused the load of the unit not to be raised and can only maintain low-load operation. Serious threats to the safe and stable operation of the unit have been continuously studied and analyzed, and the cause of unit load fluctuation has been found. Some corresponding measures have been taken to make the above Failure can be eliminated.
2 Dingyi 1 unit speed control system Introduction 301 unit turbine speed control system is fully hydraulic type, its main structure 1 sliding, high pressure secondary oil, secondary oil, lower oil K nitrogen fertilizer 3 load fluctuation analysis of load fluctuation is in the unit When the load rises, it starts to fluctuate when the load rises to 25001. When there are fluctuations, there are 2 steps. The fluctuation range is large and the frequency is high, with an average of 81 times. Because this unit is designed mainly for the balance of process steam, power generation is secondarily. Therefore, before the cause of the fault is found. Set it at a low load of 1500 to maintain production.
The turbine generator alters the power and other parameters by changing the adjustment of the adjustment system. Flash, load fluctuations caused by fluctuations in the turbine control valve. According to the report, the degree of overlap in the regulation principle of the unit has changed, resulting in a change in the secondary oil pressure, so that the regulating valve can be opened or closed to achieve the purpose of regulation. The secondary oil pressure has a negative 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, under the condition that the unit is disconnected from the power grid, the synchronizer speed control function is fully normal; after the grid connection, the synchronizer is also easy to use at low load operation; only when the load is above 25001, the load fluctuation occurs. phenomenon. At this point, the re-adjustment synchronizer cannot be called. Therefore, the synchronizer is less likely to cause a fault. To ensure stability, the synchronizer is dismantled, including checking the stiffness of its governor spring, and the synchronizer is not found. What's wrong with the components? Basically eliminates the cause of load fluctuations caused by the synchronizer.
3.3, the degree of inequality, the regulator valve fluctuations are caused by the secondary oil pressure fluctuations; and the secondary oil pressure is several times after the secondary oil pressure is amplified. Therefore, secondary oil pressure fluctuations will cause a wide range of secondary oil pressure fluctuations. The primary flash caused by the sub-hydraulic pressure fluctuations should be erected for a few moments. 3.1 When the grid frequency turbo-generator is disconnected from the grid, the function of the speed control system is to increase or decrease the load. When connected to the grid, the unit speed is controlled by the grid frequency. The time between the pressure and the turn is one.
Therefore, fluctuations in grid frequency will cause sub-oil pressure fluctuations.
However, the grid frequency is very stable. In addition, even if the frequency of the power grid fluctuates due to calculation, it will not cause fluctuations in the load imposed on the person. Therefore, the cause of the failure of the grid frequency fluctuation is excluded.
3.2 Synchronizer In a steam turbine generator, the function of the synchronizer is to use it to adjust the speed of the generator when the generator is disconnected from the power grid; when used in parallel with the power grid, it is used to regulate the power. The specific adjustment process 1 is briefly described as follows: 1 Turn the synchronizer handwheel. Will change the tension force of the governor 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 sliding port on the oil port of the Ning load is full if the speed is not equal to the rate When the turbine is dumped, the speed rises too much, causing overspeed. If the speed is not too small. The stability of the regulation system will be poor and it will easily cause load fluctuations. The adjustment of the speed unequal rate of the unit can be achieved by changing the speed-stabilizing spring stiffness below the synchronizer. 1. For this reason, the speed inequality value is appropriately increased, thereby enhancing the stability of the regulating system and avoiding the occurrence of load. fluctuation. However, after repeated tests, the purpose of eliminating load fluctuations has not been achieved.
34. The most direct and most likely research analysis and test for the wide range of secondary oil pressure fluctuations caused by the radial drilling pump inlet pressure causes an inlet throttle needle valve to close the small radial drilling pump to reduce its inlet oil pressure. Changes to stabilize the radial drilling pump outlet oil pressure is the secondary oil pressure approach. The results prove that the effect is very obvious. Since then, the unit load fluctuations have been fundamentally resolved.
Brass Bibcock
We often see brass Bibcock in every house, like the laundry tap on washing machine, Bib cock on mop pool, garden Bibcock using as outside faucet with key sometime, avoiding other people to release water. There is a multi - function brass bibcock for bathroom, 2 ways outlet, one is using for bidet shower / Arab shower, the other is using as a common water tap or connecting washing machine or Hand Shower as you like.
Brass Bibcock,Brass Kitchen Faucets,Brass Faucet,Brass Check Valve,Outdoor Garden Tap, Washing Machine Taps,DN20 Washer Tap
SHENZHEN KING OF SUN INDUSTRY CO.,LTD , https://www.handyfaucets.com