Re: Extracton Of Shale From Hopper With Rotary Arm Extractor
If the shale is wet and sticky you may be better off lining both cones with UHMW Polyethylene.
But you should first get a representative sample of the shale tested to establish its flow properties. These results can then be compared with the hopper design to see if the arrangement has any chance of working. ■
Re: Extracton Of Shale From Hopper With Rotary Arm Extractor
Also :: Ploughing involves moving material into a void; so if the plough runs on after the weigh feeder has stopped then the arm will simply compact any entrained material against the overhead download.
Item 3 is probably intended to regulate the flow; which it is certainly doing. The real limiting surface through which the flow crosses is a cone swept by the line joining the bottom corner, inside the flanged connection, and the bottom corner of the internal cone assembly.
The previous reply questions the viability of the equipment & the layout does leave a lot to be desired.
There is no flow propagation geometry. Material is consolidated onto a flat plane & if the spout, item 6, is nearly full then the plough arm will refine any tendency to bridge by consolidating the stationary material from underneath.
If you undo the fasteners on item 3 & knock it up into the main cone base, (you can't get it out through the manhole or round the cone & girder in one piece), and secure it with a few bolts you will lengthen the face of the limiting flow surface/cross section in the interests of bridge breaking. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Extracton Of Shale From Hopper With Rotary Arm Extractor
I forgot to mention appreciation of the sketch. We usually don't see enough information for starters. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Extracton Of Shale From Hopper With Rotary Arm Extractor
Originally posted by johngateley
I forgot to mention appreciation of the sketch. We usually don't see enough information for starters.
Very true, others should take note of this.
Coming back to the problem, I interpreted the original information :
"Material is getting blocked in annular space above arm. Arm is freely rotating in emptying out material in arm area and subsequent material flow stops."
to indicate that any material in the space swept by the arm is discharged but that the stored material then arches in the converging section between to conical bin bottom and the internal relief cone.
Unless the stored material can flow through the converging section there's nothing for the rotating arm to plough to the outlet. It can't reach up and pull material down.
So it's a matter of what can you do to stop the arching? Increase the annular width, a bit difficult. Increase the slope angles, possible on the internal relief cone, expensive to remake the bottom of the bin. Reduce the wall friction angle with the plastic lining mentioned before.
With a significant bit of kit like the discharger illustrated it all gets a bit difficult. ■
Re: Extracton Of Shale From Hopper With Rotary Arm Extractor
Have you tried welding blades onto the top of the arm? ■
Re: Extracton Of Shale From Hopper With Rotary Arm Extractor
Thanks for the review and comments from Forum members.
Hopper and accessories are already installed and in operation.
What kind of testing is involved for shale to establish flow properties and arrangement??. Generally hopper with rotary arm extractors are their to extract sticky / not easy to flow material. However it does not happening in present case.
To line with UMHW polyehylene liners will require lot of drilling / bolting , How about plug welded Stainless Steel ??
Shifting of adjustment sleeve as mentioned by Johngateley is already in plan. ■
Re: Extracton Of Shale From Hopper With Rotary Arm Extractor
Originally posted by shirish antrolia
Thanks for the review and comments from Forum members.
Hopper and accessories are already installed and in operation.
What kind of testing is involved for shale to establish flow properties and arrangement??. Generally hopper with rotary arm extractors are their to extract sticky / not easy to flow material. However it does not happening in present case.
To line with UMHW polyehylene liners will require lot of drilling / bolting , How about plug welded Stainless Steel ??
Shifting of adjustment sleeve as mentioned by Johngateley is already in plan.
There is evidence that with wet materials UMHW polyethylene can be better than stainless steel (you also need to be particular regarding the surface finish of stainless steel). You might be better off waiting for the results of material tests before making a decision.
For testing you could follow this link, but there are others as well.
http://www.jenike.com/pages/services/testing.html ■
Extracton of shale from hopper with rotary arm extractor
Hopper is storing shale, is provided with rotary arm extractor to extract shale from hopper and bring it in central portion to feed to the weigh feeder.
Hopper size is Dia. 5500 mm. Cylindrical height is 4600 mm and conical portion of height 6000 mm . Bottom conical portion is lined with SS 409 M liners. Bottom opening is of size 3000 mm. Pressure relief cone is of Dia. 1700 mm in bottom and height of 2700 mm. Relief cone is supported by beam at height of about 1000 mm. Height of beam is 850 mm . Cross section is 400 mm height by 220 mm wide in lower part and triangular tapering in top 300 mm.
Shale is sticky with moisture upto 16%. Extraxction rate is 7 to 70 tph
Material is getting blocked in annular space above arm. Arm is freely rotating in emptying out material in arm area and subsequent material flow stops.
What are alternative solution available to improve the flowablity of shale in hopper??
Attachments
hopperwithextractor (ZIP)
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