Regarding the shutdown problem caused by the malfunction of the turbine crisis breaker
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Hello everyone: Our company's steam turbine was shut down twice due to misoperation of the crisis breaker in 2018 and 2020, which had an impact on the stable production of the device. (Equipment installed in 2015) After the shutdown in 2018, a bushing was added outside the interrupter throttle to prevent malfunction. During the year-end inspection, it was found that the end of the crisis interrupter throttle was seriously worn (photo attached), and a new crisis interrupter throttle was later replaced. In 2020, the crisis breaker malfunctioned and shut down again. Because the device was not dismantled and inspected during operation, external casing was added again. It stands to reason that the simpler the mechanical structure, the higher the reliability, but it backfires. I would like to ask the following questions:: 1. Do you have similar faults in your workplace, or have you heard of similar faults (whether they are frequent) ； 2. Are the design structures of crisis interrupters consistent for different types of steam turbines? Which design is safer and more reliable? 3. Is it possible to modify the crisis interrupter, cancel or replace the structural form? What is the feasibility and safety impact? (There is SIS interlocking and a manual stop button on site) 4. How does the crisis cut-off throttle wear out? Welcome to guide the discussion, thank you! ! ! If there are design and manufacturing manufacturers, they can also provide technical support, thank you!
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The opinions of the copycats are as shown in the picture. I wonder if there is vibration in the shaft in the upper right corner of the picture, and whether there should be a certain gap between them during installation. If such a structure is set up, the shaft in the upper right corner will vibrate, link the shift fork, and then cause friction with the lock head, which is the key to the problem. So you need to check whether there are any relevant requirements for this part during installation. For reference.
Absolutely do not cancel. Adjust the clearance and flyout distance of the flying hammer.
The structural types of different manufacturers must be different. Isn't it recommended to cancel and find out the real cause of the malfunction? The countermeasures you took did not work, otherwise the second malfunction would not have occurred. Ask the manufacturer's technical department to see if it is a common problem and if there are any countermeasures.
Thank you all for your replies. The analysis of the cause of the first malfunction was that the emergency cut-off throttle (item 7) was worn, resulting in malfunction and shutdown. Theoretically, there should be no relative rotation or friction on the crisis interrupt throttle. The second suspicion was also a problem of cutting off the accelerator during a crisis. Contacted the manufacturer, no clear answer was given. We can only wait until the machine is shut down for disassembly and inspection before processing. There are no plans or improvement measures to completely deal with this problem. At present, we use casings for external support to prevent malfunction and shutdown.
First: Our unit has been operating for more than 30 years and has never had a similar situation happen. This is the first time I have heard of such a situation. ； second: We use several models of turbine oil, and the emergency interrupters are exactly the same. ； third: Is the loss greater if a misoperation occurs once, or if the vehicle fails to operate? The emergency interrupter is the last "natural line of defense" of the turbine and must not be removed. As for transformation, it is possible, but it requires a higher level and technology:) ； fourth: As for wear and tear, I personally think that in theory only vibration can be generated, otherwise where would the displacement and force come from!
Too little information, how is the wear caused? The reason is unclear. It should be comprehensively analyzed based on the operating conditions. Judging from LZ's statement, all other causes including flying hammers have been ruled out. Is it a quality problem with the emergency circuit breaker itself? Adding sleeve protection means that the emergency breaker has failed and the turbine is running without protection? This approach is too risky. . . It is recommended to investigate thoroughly: lol