I’d like to share with you the process for dealing with scale buildup on the smoke extractor rotor
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This post was last edited by LQ198619 on 2017-7-24 at 13:29. The problems of scaling and wear in smoke extractors have long been a challenge that affects their long-term operation. At present, most catalytic units can operate for more than 2 years, but accidents such as excessive vibration and blade breakage occur from time to time due to wear and scaling in these extractors. A few days ago, during operation, the vibration levels of the extractor in our unit began to increase gradually. Attempts were made to address this issue by adjusting the flow rate of the cooling steam and adjusting the movable butterfly valves, but none of these measures were effective. As a result, the workshop decided to shut down the main extractor and switch to the backup fan. Since the impeller in use had already reached a service life of 6 months and had been cleaned of scale previously, it was decided this time to replace the impeller of the extractor. Analysis of the causes of this scaling: 1. Catalyst wear has led to an increase in the amount of fine catalyst powder. Over time, due to impacts, wear, and other factors, most of the catalyst particles become damaged, resulting in a decrease in their average particle size. This increases the amount of catalyst powder, and as a result, the concentration of this powder entering the flue gas engine rises, which is also one of the reasons for scaling in the flue gas engine. 2. High dust concentration is the direct cause of wear. When the dust concentration in the flue gas is high and the dust particles are large, failure to detect this situation in a timely manner causes the smoke extractor to operate under harsh conditions for an extended period, ultimately leading to failures. It is recommended that those without an online system for monitoring dust concentration in flue gas conduct regular checks of this concentration; this can effectively extend the service life of the smoke extractor’s rotor. 3. Regarding steam quality, the steam cooled by the wheel may contain water. Below are images showing rotor scaling; the last one is a picture of the new rotor: http://down.hcbbs.cc/attachment/forum/201706/10/203353z7y06fdo70r6eod0.jpg. The Petrochemical Section – New ideas for energy savings through creative thinking (the second phase of this activity is currently in progress): http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1666758 (Source: Haichuan Chemical Industry Forum). “My Technical Upgrades” in the coal chemical industry in 2017: http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum website). First round of voting for the best e-books from Haichuan – chance to win prizes by voting (for members of the Management and Technology Group and those in grade 5 or above): http://bbs.hcbbs.com/thread-1799455-1-1.html (Source: Haichuan Chemical Industry Forum website)
There are signs of wear at the front end of the blade
Yes, a new impeller was used this time
The third and fourth stages of the cyclone separator should be inspected; meanwhile, online analysis of flue gas should be implemented to ensure that both dust content and particle size remain within acceptable limits. Regular replacement of certain catalysts is necessary to resolve the issue fundamentally; otherwise, flue gas dust will pose a problem even in the afterheat recovery system
Indeed, measuring the concentration of flue gas dust is done to determine whether there is leakage in the regenerator and to assess the recovery efficiency of the three or four spinners
I took all these photos; how did they end up on your place? The manager wants to talk to you tomorrow morning; you might get fired for stepping into the office with your right foot first! I’m not scaring you! :lol
With such severe corrosion and scaling, there must be a problem with the dynamic balance.
Support, this is the section where I support the big boss! Look, how many posts have I made in the region you’re in charge of these past few days.
In fact, no one has grasped the core of the issue. Actually~ never mind. Can’t say it, can’t say it! ;P
Replace the impeller? Isn’t it to replace the blades? Is it cheaper to replace the impeller and blades? Performing dynamic balancing is essential; these old blades can be turned into a batch of excellent knives