Dust Control Pet Coke
How are the wagons unloaded? Are these unloaded by wagon tipplers or these are bottom opening box wagons.
Burnley Baffles installed on top of receiving hopper may be able to reduce fugitive dust to a large extent.
You can get more info by logging to: http://www.mideco.com.au/products.htm ■
Re: Dust Control - Pet Coke
Is the dust generated from the actual dump cycle? Rotary car dump or bottom dump? Dumping into empty hoppers? What is the takeaway tonnage capability?
Sometimes dusting may be significantly reduced by modifying the actual operating procedure to reduce displaced air during the cycle.
Chemical suppression would solve most of the dusting issues when properly applied, baffles assist in reducing or directing airflow as well. Water vapor in that volume from a dry material is unusual - is it prewashed coke? Sponge or pelletized? ■
Re: Dust Control - Pet Coke
Hello everyone - I have been on the road for a while.
This system is a petroleum coke delivery/crushing operation for an electric power plant. The coke is delivered in bottom dumping rail cars that dump into a receiving hopper. The coke is always delivered in a very wet condition and the bottom of the rail cars are usually dripping water. The coke is then lifted up to the roof of a very large barn and dumped onto the the floor of the barn. The pile on the floor is allowed to remain there to drain the excess water. A front end loader takes the coke from the pile and dumps it into a crusher feed hopper where the large pieces (1" to 2" in diameter) are crushed in preparation for delivery into the boiler burner. Even though the coke is very moist at the entry to the crusher, considerable dust is generated by the crushing. The coke does not absorb the water and therefore, when it is crushed, it generates a dry fine dust.
They currently have a baghouse dust collection system that is very inefficient due to the amount of moisture in the dust stream. To compound the issues, this region of the country often has winter temperatures of neg. 20 degrees F. When the weather turns cold they usually have a completely frozen system.
I am trying to make recommendations to the power plant management folks for dust control improvement.
Suggestions or comments? Thank you. ■
Re: Dust Control - Pet Coke
Horses for Courses my friend. Why not use a scrubber system i.e. draw the dust laden air through a water bath. The dust will be trapped in the water and can be recovered with a drag chain. The bag system is doomed for failure in this type of application. ■
Re: Dust Control - Pet Coke
Dave - my first option would be a scrubber system but my client will not agree to install one. This system is between 50 and 60 degree north latitude and out in the open. A scrubber system may present freeze-up problems at neg. 20 degrees F.
Yes I agree with your comment about the media filter approach. They currently have two large baghouse filters and many times they are completely blinded with moist dust. ■
Re: Dust Control - Pet Coke
I appreciate the problem but heating such a small volume of water is a lot cheaper than living with the high cost of bag replacement. Yes the airflow will be cold but the water is being aggetated. When I worked at a cement plant in the North of England we used to heat the air to overcome freezing problems. OK it only got down to -10 on rare occasions but it did the trick.
I would think that your urrent bags blind after a day of operation and are probibly changed once a month. ■
Pet Coke,
If crusher or pulveriser works all the time, you can consider directing vented air into furnace as secondary air for combustion. This may be possible if crusher / pulveriser is close to boiler. ■
Pet Coke
Hi
Is there a cyclone in this system? If not, you might consider a high efficiency cyclone system (traced and insulated) It should remove a significant amount of moisture and dust and perhaps achieve emission objectives depending on the psd of the 'dust' and dust loading to the cyclone. Erosion is a definite negative in using a cyclone system, however there are linings that have been used successfully in similar service.
A possible problem area could be their instrument air. How good is their instrument air? In cold climates 'wet instrument air' can be the source of many problems attributed to other causes ■
Dust Suppression
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Dust control - Pet Coke
Hello everyone - I have been a mechanical engineer for many years and I have finally bumped my head on a project that I would appreciate any ideas and comments upon. I have no experience with pet coke dust collection.
This is a power plant application where petroleum coke is brought in by rail car. The coke is dumped into hoppers and then distributed to crushers. Obviously this is a very dusty operation. There is an existing dust collection system that uses baghouse collectors.
Problem: Water vapor from the coke is plugging the filter media. In telephone conversations with the plant I have learned that this system is totally useless during the winter months when the outdoor temperatures get to -20 degrees F. I would imagine these dust collectors become big blocks of ice.
I have not been to this plant yet. I have a trip planned for next week.
My questions:
1. Does petroleum coke always contain moisture?
2. What type of dust control systems are successful on pet coke delivery systems?
Your discussions and advice is welcome. Thanks. ■