Dust removal from pyrolytic gas
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In the fluidized bed solid heat carrier process, the dust content is too high after passing through the dry distillation furnace. What is generally done to address this? Cooling is used during dust removal; will the tar present in the gas have an impact on this dust removal process? Currently, high-efficiency cyclone separators are generally used to remove most of the dust, followed by wet dust removal methods to eliminate all the dust and reduce the temperature to some extent. For situations where there is a large volume of gas at high temperatures, what approaches can be used with high-efficiency cyclone separators? And what are the common methods for wet dust removal nowadays?
The use of high-temperature oil and gas purification equipment prevents temperature reduction, which leads to the precipitation of coal tar; if dust removal is not effective, this can result in substandard tar or an increased rate of tar precipitation.
I think the key is that the cyclone separator should have good dust removal efficiency; for wet dust removal, a Venturi tube can be used!
This is a very tricky technical issue; previously we used a cyclone separator combined with wet dust removal, and as a result the tar had an excessively high ash content. Later, high-temperature electrostatic dust removal was tried, and the results were good.
You can choose an electrostatic tar catcher, which can remove dust as well as tar, achieving two goals at once. qq395159906
At what temperature does your electrostatic precipitator operate? I was wondering which company manufactures the electrostatic dust removal equipment you are using?
Strictly speaking, it can only be considered medium to low temperature, 450–500°C. Since this is a trial, we turned to manufacturers of electrostatic precipitators used in power plants for this task, and this brings up several issues. Firstly, the insulation is not very good. Secondly, the sealing is not very good either. Furthermore, the ash removal system is not very suitable either; oily ash tends to stick together, requiring mechanical devices for its removal.
When the gas coming out of the carbonization furnace is cooled to below 400°C, tar may precipitate. Tar is extremely viscous; it not only hinders dust removal but can also cause pipe blockages. Cyclone dust collectors handling large volumes of gas generally require an inner lining to enhance their wear resistance. A tangential air inlet method offers higher efficiency. It seems that multi-tube cyclone separators also exist; I haven’t used them, so I’m not sure about their performance. Additionally, at high operating temperatures, the gas velocity increases, so when selecting a cyclone, the air inlet speed should be set higher than at normal temperatures to achieve better efficiency. The most commonly used method for wet dust removal is still the Venturi dust removal process, which generates a large amount of dust-containing wastewater as a result. Wastewater needs to be treated, and in the presence of tar, Venturi nozzles are also more prone to clogging.
Can electrostatic precipitators now achieve such high temperatures as well? Impressive
I also want to ask about the performance of high-temperature electrostatic precipitators at around 550°C And what are the existing problems?
The problem of dust removal at low temperatures is very tricky; has it been overcome yet? Any progress? It is said that many different dust removal methods have been tried