Gypsum Issues
If you are using a vacuum filter the ideal system would be simply to increase
the length of the vacuum filter 2 times to double the square area exposed to
the gypsum and or simply reduce the belt speed at the same time increasing the time
the FGD gypsum byproducts is exposed to a negative pressure gradient to
remove the residual water.
A bucket elevator is simple to use and maintain as long as it is maintained. ■
Re: Handling Of Fgd Gypsum With Bucket Elevator
Originally Posted by lzaharis
the length of the vacuum filter 2 times to double the square area exposed to
the gypsum and or simply reduce the belt speed at the same time increasing the time
the FGD gypsum byproducts is exposed to a negative pressure gradient to
remove the residual water.
A bucket elevator is simple to use and maintain as long as it is maintained.
Have you considered a pressure filter instead of vacuum filter? ■
What About A Sandwich Belt Conveyor?
Have you considered the use of a sandwich belt high angle conveyor? These have been used before for FGD and could resolve the concern of buckets because of space. The DSI Snake Sandwich High Angle Conveyor is capable of elevating completely vertical and assuming the FGD will be a sticky material, can be scraped clean with belt scrapers. The DSI Snake is also made up of all conventional conveyor parts. Please forward the specifics of your requirements and allow us to give you a quote on this. Send to aduncan@dossantosintl.com
Regards,
Amy Duncan
www.dossantosintl.com
+1 770 423 9895 - office ■
Handling Of Damp Products
As with most problems in relation to solids handling, the best approach is to consider the matter from fundamental principles, rather than to seek 'brute force' solutions The essential point of this enquiry seem to be the flow condition of the gypsum. With relation to a bucket elevator performance, this tranlates to how reliable is the feed at the inlet and whether the material will stick in the buckets at discharge.
The first issue can be dealt with by fitting a suitable screw feeder to directly inject the material into the line of passge of the buckets. A form of clog-resisting ribbon flights developed by Ajax equipment has proved to be very effective at handling such damp products as filter cake and centrifuged products. Incorporating such a unit with the filter cake collection system will overcome this aspect of the problem.
On the second point, bucket elevator manufacturers have much experience in fitting buckets of a shape and constructional material to resist product adhesion and throw the contents clear at the outlet that they should be able to provide a suitable assurance of their suitabillity for this duty. If in any doubt, wall friction measurements will identify the surface cohesion value of gypsum with differing moisture contents and should form the basis of a sound design. ■
Handling of FGD Gypsum with Bucket Elevator
Hello everyone!!!
I am Raj Arjun Pandey, currently working in NTPC Ltd., and involved in the engineering of Flue-gas desulfurization Plant. I have a query regarding use of bucket elevator for handling FGD gypsum. We have envisaged Bucket-Elevator for Handling of Gypsum at the outlet of gypsum dewatering unit. The gypsum shall be fed to the bucket elevator from Vacuum filter and then it shall be conveyed to gypsum storage silo. Although, Gysum are widely conveyed using Bucket Elevator, we have an apprehension regarding usage of bucket elevator for gypsum handling due to high moisture content in gypsum at the feed point of bucket elevator. The moisture content in FGD gypsum is around 8-12 percent and can go up as high as 15 percent. We could not envisage conventional conveyors because of space constraint in FGD area and that is why we have decided to use bucket elevator as it is being used widely in cement industry for gypsum handling.
Therefore, we seek your suggestions regarding usage of bucket elevator for handling of FGD gypsum. Also Please suggest us the other methods which can be employed for transportation of gypsum.
I look forward to your valuable guidance in this regard. ‘Hope to hear from you soon.
Thank you very much!! ■