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Sachin Pawar
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Join Date: Jul 2011
Posts: 5

Lime Conveying System

07/05/2011 3:02 AM

For Lime Conveying System 22 TPH, Conveying Distance is Horizontal 400 Meters, Vertical 35 Meters, 7 Nos.bends. Lime having bulk density 1000 m3/Hr and in powder form.

Please suggest proper solutions for above material conveying with necessary technical details
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Tornado
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#1

Re: Lime conveying system

07/05/2011 3:22 AM

Is the vertical part uphill, or downhill? The 1000m3/hr is not a density, but we can infer the density from the 22 tph. Why (7) bends? (If possible, reduce that number.) A sketch might help.

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TonyS
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#2

Re: Lime conveying system

07/05/2011 4:50 AM

The best people to contact would be http://www.flsmidth.com/en-US/Products/Product+Index/All+Products/Pneumatic+Transport/Dry+Screw+Pumps/Fuller-Kinyon+Pumps I've worked with their pneumatic transport pumps for many years and they have been reliable.

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sanjaykangralkar
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Popular Science - Weaponology - New Member India - Member - New Member

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#3

Re: Lime conveying system

07/05/2011 4:52 AM

u r doing this on own?

ask expert?

Pneumatic conveying is better.
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ffej
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Location: Geelong, Australia
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#4

Re: Lime Conveying System

07/05/2011 10:29 PM

LIME! Stay away from the stuff.

It flows like water through the smallest hole but turns into a solid and can't go through the largest opening when you want it to. If you aerate it the air all goes along one path and the rest stays compacted. If you vibrate it, it turns into rock. It gets into everything, including the faces of contacts and relays causing arcing and switch destruction.

The only constant is that every conveyor salesman tells you "We do this all the time and never have any problems".

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TonyS
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#7
In reply to #4

Re: Lime Conveying System

07/08/2011 9:11 AM

I know what your saying it's put me in hospital twice. Having blisters scraped off your eye's isn't fun, having you boot filled with boiling lime slurry didn't chear me up either! I've spent 23 years in the lime industry, good fun except for the two little instances.

Pneumatic conveying is the way to handle the stuff. As I said in an earlier post we always used Fuller Kinyon.

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Pulpmillguy
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#5

Re: Lime Conveying System

07/06/2011 3:31 AM

Pneumatic conveying is your best option. I agree that you should minimize the number of bends in the system as lime dust is very abrasive.

Search the internet, there are several companies that provide systems that will do just what you are proposing. Without more information it would be difficult to provide "necessary technical details"...that is what the sales rep from the pneumatic conveying equipment companies are for.
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jhhassociates
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#6

Re: Lime Conveying System

07/06/2011 6:17 AM

I am basing my reply on your "lime" actually being Pulverised Limestone which has a bulk density(BD) of 1009Kg/m³, rather than Lime with a BD of 673Kg/m³ or Pulverised Quicklime with a BD of 961Kg/m³. While Pulverised Limestone is slightly hydroscopic, Lime and Quicklime require specialised equipment such as per-treatment air driers for pneumatic conveying.

Pneumatic conveying falls roughly into three groups, all of which will cope with ease over your distance. Use long radius bends, and make the pipe runs either horizontal or vertical, pneumatic conveying does not deal well with slopes.

Dense phase positive pressure, where batches of material are accumulated in a pressure vessel and then injected into the conveying line as a series of slugs. The conveying speed and therefore the abrasion is low, but it has some problems with fine powders. You need to have minimum distances between bends and a system of your length would benefit from changing the pipe diameter about ¾ along your pipe run. I think that your required flow rate may be too high for an economic dense phase installation.

Lean phase positive pressure (LPPP), where the product is trickled, at a controlled rate, into a fast flowing stream of air. This is done with a rotary valve or a short length of screw conveyor. (Screw conveyor option will give less problems on fine powders.) This is 8-10 times more abrasive, but wear is only a serious problem at the bends. Specially hardened bends are available but expensive. I sometimes use a triple ply rubber hose (the type used to pump sand and gravel in quarries) instead of solid bends. Only the internal surface impacted by the product as it rounds the bend gets any wear. With a hose you can rotate the bend section through 90° every six months to even out the wear over all of the internal surface. Hoses also allow you to subtly change radii or the line so that you can often mount the pipes onto existing steelwork.

Lean phase negative pressure, similar to LPPP but the product is sucked through the pipe using a vacuum. If you have a very clean environment, like food or pharma then this option must be considered. Any leaks, and there will be some even in the best constructed system, will suck air in rather than blowing powder out.

With all pneumatic conveying the exhaust air has to be filtered, usually with a "backjet" filtering system. In the long term, over sizing the filter area will pay dividends. Vacuum systems often use a cyclone to separate the product from the air stream, and while positive pressure systems don't normally include this, in a 24/7 plant it pays to add it.

If the "lime"? is converted into a slurry at the receiver end of the transfer system, consider adding the water just under the storage silo and pumping the slurry to it's destination. No filters, standard (cheap) bends, very little wear, and about one third of the energy required to do the transfer.

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fwuertele
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Join Date: Jul 2011
Posts: 1
#8

Re: Lime Conveying System

07/08/2011 5:06 PM

Dear Sachin Pawar,

We can help you with sizing the pipeline and power requirements, and provide a cost estimate for the equipment needed for your lime conveying system.

Please send your contact details for a response by email.

Sincerely,

Fred Wuertele

FLSmidth - Pneumatic Transport

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Sachin Pawar
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#9
In reply to #8

Re: Lime Conveying System

07/09/2011 1:44 AM

Dear Sir,

Please send technical details and cost estimation to my following mail id.

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Regards

Sachin Pawar

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Anonymous Poster #1
#10
In reply to #9

Re: Lime Conveying System

07/09/2011 3:33 AM

So you from rajdeep Engineering.

Are you fresher in this field?

Rajdeep is renowned company in pneumatic conveying in india.

Ask your seniors definately they guide you. Do it at your own to get proper depth in your profession.

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