How to solve the problem of scale formation on the impeller of coal boiler exhaust fans
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Over the past year, the boiler exhaust fan has been repaired on several occasions; the main reason is likely the presence of water in the soot, which causes scaling on the fan impeller, leading to uneven operation of the impeller and severe vibrations. The main boilers are all in use, and it seems difficult to modify the water film dust removal equipment; there is a concern that such modifications could increase resistance and reduce the amount of air drawn in, leading to incomplete combustion of coal. It’s quite frustrating in this situation – making any changes would involve too much work and cost too much money. I wonder if anyone here has any good solutions. For a normal boiler exhaust fan, maintenance once a year after one year of use should be sufficient, right? Please give me some advice. The boiler is a 4-ton boiler. This post was last edited by lxzzl on 2008-8-26 at 14:54.]
We regularly use water to wash away the dirt, and we are hoping for advice from those with more experience on better methods.
If you don’t want to spend money on renovations, then clean it regularly; don’t wait until the fan starts vibrating severely before carrying out maintenance.
I have a question: There is gray scale stuck on it, which has caused some corrosion on the impeller; it can only be removed by hitting it with a hammer. Would using water work well? Is your cleaning cycle one month? ?
Do any other friends have any good solutions? The current usage period is about half a year, after which it needs to be taken apart for balancing. . . It’s quite troublesome; regular cleaning is necessary, but there’s a fear that it won’t be done properly, which could instead affect operation
We used to have boiler exhaust fans, and the water film dust collectors were fed with the company’s wastewater (which could be concentrated to reduce wastewater discharge or converted into solid waste). Due to the high viscosity of the wastewater, the dust removal efficiency was poor, which often led to water entering the fans and resulting in ash accumulation; cleaning became necessary after the fans had been in operation for a while. As for any good solutions mentioned by the original poster, I don’t think there are any; one should schedule regular cleaning before the equipment starts to develop problems. If the problem must be solved, then the only option is to think of ways to modify the water film dust collector mentioned earlier. It would be even better if someone with more experience could give some guidance!
If there’s a piece that can’t be washed away by water, it’s especially hard. . . . . Then won’t the impeller balance be poor? Please advise
Only through regular cleaning, by using stainless steel impellers (though this is more expensive), or by lining ordinary impellers with fiberglass.
1. Improve water quality by using softened water. 2. Conduct regular maintenance and clean the impeller. 3. Perform balance tests to ensure good dynamic balance of the rotor. 4. Change the material of the impeller or enhance its corrosion resistance
The output from the water film dust collector is dilute sulfuric acid, which is highly corrosive; therefore, it is advisable to use 316L material for the impeller of the induced draft fan as well as for the lining of its casing. During cleaning, the holes located next to the casing should be opened, and a copper shovel along with water should be used for cleaning. Once cleaned properly, the device can be restored to its dynamic balance.