How to cool the ash slag from electrostatic precipitators?
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Our company has installed a new electrostatic precipitator for the production of acid from 60,000 tons of pyrite (using a washing process). It is designed such that the ash and slag removed are sealed using an overflow spiral mechanism, after which they are directly discharged onto the slag conveyor belt. We’ve just started using this device, but we think it’s not working properly; the main issue is that the temperature of the ash is too high, around 200 degrees, which can damage the belt. I wonder how the slag discharge works in everyone’s electrostatic precipitators? Please advise?
The ash produced by electrostatic dust collection can be fed onto the conveyor belt only after being humidified. Currently, there are two main methods for humidification: one is the dual-axis slag humidifier for humidification and cooling ； Second is humidification and cooling using a drum cooler.
Use a screw conveyor to send the ash to the storage bin and then transport it to the desired location
Could the original poster please measure what the temperature is? I really want to know this data!
Generally, after passing through the electrostatic precipitator, the material enters a cooling drum or an immersion drum for further cooling before it can be fed onto the conveyor belt
Our factory uses hot-embedded scrapers, which are quite good. There are also those that use rollers.
It is recommended to use: a drum cooler for humidification and cooling.
A simpler approach is to add a dual-axis or single-axis spiral humidifier and then remove the belt. The thorough solution is to use an overflow screw to feed the material into the buried scraper; humidifying and cooling drums are installed at appropriate locations to collect the slag from the overflow port of the boiling furnace, the dust from the waste heat boiler (if no additional installation is necessary), as well as dust from cyclones. The humidified slag is then conveyed via belts to a slag storage area or dump site.
It is better to use rollers, as they produce less dust. Only two sections of cooling rollers are needed, which results in lower investment costs; however, scrapers have a higher tendency to fail