What is the ash discharge method for electrostatic precipitators?
Thread Content
Urgent! In my company, the dust from the electrostatic precipitators is discharged directly onto a belt conveyor after passing through a screw conveyor, which results in dust everywhere and creates a very poor working environment. Do any of you have any good suggestions?
An electric dust collector hopper – a sealed screw feeder – and a scraper conveyor can be used for discharging the material; it is advisable to use a double-chain conveyor, and an externally cooled version can be chosen if the temperature of the material is too high
On the same floor, the overflow screw feeder is connected to the buried scraper conveyor, and both are fully sealed. Buried scraper double-row chain, externally cooled by cooling water
Logically, after being removed by the screw conveyor, it should be humidified by a humidifier before being discharged.
Generally, the ash discharge temperature of electrostatic precipitators is above 250°C; how can it be fed directly into a belt conveyor? This is recklessness. First, the temperature needs to be reduced; otherwise, the belt is likely to get damaged and a large amount of ash will be produced ； Second, increase humidity to facilitate transportation.
The 2nd and 3rd floors resolved the sealing issue between the electrostatic precipitator and the belt conveyor. The issues related to the transfer of dust were addressed on the 4th and 5th floors. If humidification is not used, a large amount of dust will be generated during each transfer; the electrostatic precipitator captures dust, not large particles, so it is normal to have dust generated during transfers. Whether humidification is needed depends on the specific process: 1. For example, if the dust collected by the electrostatic precipitator is to be transported to the raw material storage area, humidification is not appropriate. Using pneumatic conveying is the best choice. 2. If transporting directly, it can be humidified, or a dry ash dispenser can be used. 3. If humidification is not allowed in the next processing step, and cost savings through the use of belts are desired, it is necessary to improve sealing by employing appropriate sealing covers, along with sufficient exhaust airflow.
Thank you all for your support. We once used humidifiers, but found that with added water to increase humidity, dust would easily stick to the shafts and blades, covering them up and making it difficult to humidify the air properly, thus preventing normal operation. So I would like to ask everyone for any good solutions?
Our plant uses a spiral ash discharger, with a drum ash discharger underneath; it is fully sealed, so there is almost no ash.
The following method from the 8th floor can be adopted; our company’s process involves mixing it with coarse slag, cooling it in a drum, and then discharging it after humidifying it.
Reply 8# ychina: Is it used alone? Is your drum designed for both cooling and humidifying?
Reply to 1# l5686182: Can you see my reply? There is a type of drum that combines cooling and humidification. There is no issue with the axis. You might as well take a look. It works very well!