The induced draft fan is corroded and damaged too frequently
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The harmful gases HCN, HCL, and CO2 are removed using an exhaust fan. There is a buffer tank in front of the exhaust fan and a chimney behind it; as a result, the liquids flow into the chimney through the exhaust fan, which causes it to corrode at an excessive rate. Please help improve the equipment or the process
How are these harmful gases produced? I want to know where their source lies
If the gases cannot be removed, efforts must be made in the buffer tank – for example, by installing a cyclone separator, using cooling methods, or adding a defoamer, etc. In short, the corrosive gases need to be filtered out completely.
Why not pass it through an absorption tank before sending it to the fan, or apply anti-corrosion treatment to the impeller section? Simple layer of paint can also work effectively.
The original post was posted by ZHANGLINGFEI on 2008-1-25 at 16:06. Exhaust fans are used to remove harmful gases such as HCN, HCL, and CO2. There is a buffer tank in front of the exhaust fans and a chimney behind them; as a result, the liquids end up entering the chimney through the exhaust fans. The exhaust fans get corroded very frequently. Please help improve the equipment or the process. Why are there so many harmful gases, and they go into the chimney? Shouldn’t they be emitted outside? Can this be considered compliant? At the very least, a basic treatment facility should be added. If fewer harmful substances are emitted, the damage will be reduced. HCL and HCN are highly corrosive even in the presence of a small amount of water; it is better to use an alkaline wash.
Strongly agree with the comment above: lol. Harmful gases must not be released indiscriminately! Environmental protection is an important issue that every citizen should pay attention to; the corrosion of fans is far too trivial in comparison. What LZ should consider first is how to properly handle harmful gases, rather than simply releasing them. :Q
For exhaust fans alone, the casing is preferably made of fiberglass, which can withstand such corrosive gases and possesses high strength.
Behind the exhaust fan is the chimney; how can you allow emissions with all these things present? Moreover, where such substances are produced in large quantities, a flue gas monitoring system must be installed. The problem cannot be attributed to the exhaust fans; instead, the issue lies in the manufacturing process, and it is necessary to prevent these substances from entering the exhaust fans. Acid removal equipment should be added at the earlier stages, such as spray absorption towers, or by using lime slurry or NaHCO3 to remove them. There are many ways to prevent corrosion of exhaust fans, some of which are quite simple. However, it’s best not to consider this aspect – the impact of a single exhaust fan on the environment is minimal compared to other factors!
The idea is to convert the harmful gases into a liquid form and release them through the valve at the bottom of the buffer tank, from where they can be sent to the wastewater treatment facility. A small amount of CO2 is released through the chimney, but as mentioned earlier, the resistance in the absorption tower is too high, preventing the CO2 gas from being extracted. What should be done? ? ?