Regenerated flue gas dust removal project
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The last edit to this post was made by liaifeng on 2018-9-10 at 18:12. Dear experts, how can dust be removed from the flue gas generated during the regeneration of catalytic devices, so as to meet the emission standard of 20 mg/m3? What are the investment requirements?
Now, the standards for controlling gas emissions are becoming increasingly strict. Back in 2012, there were talks about revising these emission standards, and it seemed they would become much stricter. Our company decided to invest in a flue gas dust removal system even before those revisions took effect. I also went with my supervisors to visit several companies; that was probably during the summer of 2012. However, the results of the evaluations were not very satisfactory; many attempts were made to adopt the dust removal technologies used in power plants or coal yards, but such technologies are not yet fully developed for use at high temperatures. Later, the management inspected other companies, and ultimately the water washing method was chosen for dust removal. An investment of around 1700W was said to have been made.
What is the core particle size for dust removal? How large is the processing volume? What’s the temperature?
Flue gas volume: 40,000 standard cubic feet; solid content: 150 mg/m3; particles smaller than 5 μm account for over 80% of the total particles. Current temperature is 190 degrees, with an estimated maximum temperature of 280 degrees
Filters with metal or ceramic filters require an investment of around 1000W
The investment is too high; what if the fine powder gets into the filter element’s pores and cannot be blown out?
It depends on the composition of your smoke gases; a bag filter can be used. However, due to the high temperature, the service life of the bags will be reduced accordingly. It might be possible to install a pre-cooler in front of the bags. If the oxygen content is low, I can prepare a solution for you at a more affordable price
Here is a set of design data for comparison: When using SUS316L powder filters or sintered felts, the filtration efficiency for particles larger than 1μm is 99.98%, while the interception efficiency in the 0.1–1μm range is approximately 97% (keywords: Brownian motion, collision, kinetic energy, adsorption)； Many gas filtration manufacturers don’t understand the principles behind this, so I won’t go into details here ^_^ Only particles of 0.3μm are special in that their interception efficiency can only reach 90%. This is a project I worked on; the product has already been delivered. It has a power rating of around 600W. If you’re interested, feel free to send me a private message
Where are you from? Is it due to environmental regulations or something? The typical design value for catalyst dust emissions is 100 mg/m3. There have been cases where the required level was 30 mg/m3, with investment costs for dust removal exceeding 10 million. The parts also need to be replaced frequently, which results in high costs.