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boyleblue  
#1 Posted : 26 August 2013 10:32:39(UTC)
Rank: Forum user
boyleblue

We have 2 fine coal silos which hold 70-100 tons of fine coal in each.

I have heard that we maybe planning in cleaning the inside of these fine coal silos in the future. A assume the method of cleaning will be by power washing.

Have you any experience on how fine coal silos should be cleaned and is a power wash method the best/ safest way in cleaning fine coal silos.

I have heard that mixing water and fine coal can be hazardous.

Any help /advice on this would be appreciated
Sandan  
#2 Posted : 29 August 2013 10:57:53(UTC)
Rank: Forum user
Sandan

okay - to start with the obvious (bearing in mind I am not an expert in this but there is read across to other industries...)

The water and coal dust mix would be a contaminent so you would need some sort of containment/seperator.

The dust, once all the coal is removed, is flammable so think about DSEAR and have appropriate mitigation measures in place (including for any tools used [think of the old ATEX system and you can't go far wrong with a bit of tweaking])

It should be classed as a confined space.

Breathable air? Rescue options & gas monitoring.

I would suggest looking at other industries for cleaning in case there is a better method (brewing - their grain silos etc).

On the other hand, being a solid (even fine) why would the inside need cleaning? I assume it would remain dry and therefore the dust should come out by itself (how about trying a new system out - sonic shocking the silo to 'knock' the dust out? just a suggestion, remember, I am not an expert!!!)

I am sure there are personnel better qualified than I to give you a better idea.

You could contact the HSE directly for any suggestions?

Good luck and let us know how it turns out.
Phil Grace  
#3 Posted : 29 August 2013 11:10:52(UTC)
Rank: Super forum user
Phil Grace

I think that fines left after silo is emptied woudl be more likely to present an explosion risk rather than being regarded as flammable.

Definitely a confined space and whole job sounds pretty risky to me!

Phil
ExDeeps  
#4 Posted : 29 August 2013 11:32:52(UTC)
Rank: Super forum user
ExDeeps

Hi,

Not sure what you mean by "fine coal"; is that the size/grade of the coal or the quality of the coal? Might make a difference.

As for cleaning the silo, I am working on the idea that these silo's are around the size of a closed rail truck, possibly stood on it's end? I would not go for the power wash, why create a coal slurry that then needs further processing? I would suggest looking at the possibilty of fitting rapping gear on the outside of the silo to shake the coal down, especially if you get problems such as the coal not flowing due to excessive dampness when being delivered.

Jim
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