I've seen it red hot before it hits the quench water.

Submerged belts have been used, though I think more normally submerged chain conveyors are used.

Depends a bit on the amount of as the conveyor needs to take away. ■

I have seen mostly very heavy drags in this application, sometimes submerged screws in smaller applications.

Never seen a belt used for this. It is a brutal application for a belt particularly because you can never make a perfect skirt seal around the belt edges and material will quickly grout the belt in solid. Under water you will not know what is happening until everything stops. ■

For Bagasse/Coal fired boilers submerged belt conveyors are the norm.

Check the type of coal, the ash content and if possible the type of ash produced. This could vary from very fine grits to large clinkers depending upon the coal being burnt.

Regarding temperature..... This is a variable since the grits lose temperature very quickly whilst the clinkers take much longer. Hence check the coal type and also check if the type of boiler proposed is prone to developing clinkers. ■

Dave, I am curious how the belt is installed in the quench tank so that fines don't get around the edges and build up below the carrying belt.

Also, are these belts or chain belts? (ie a belt bolted to a heavy chain on each edge so that it can pass through a tight concave curve) ■

Hi

Have used both the SSC (Submerged Scraper Conveyor), and the underwater conventional troughed belt conveyor, for bottom ash.

What I learnt from this is that the SSC is far superior, especially if designed by someone who has done it before (many times.....many, many many times).

I hope this helps you

Regards

LSL Tekpro ■

At 5 tph you could dump it into a skip full of water. Depends on how far you want to go. Five tph is perilousy small to justify forking out cash on an SSCC.

Belting must be a joke. ■

Good point John

I missed the fact that it is only 5t/h

For this duty we normally sluice the ash to a pit and simply pump it away.

Cheers

LSL Tekpro ■

Oh, and incidentally...

There are about eight coal fired dryers at a Phosphate plant here in RSA at Phalaborwa.

Each produces a small amount of ash which is water quenched and sluiced to pits.

From there it is removed from the wet pits by a slow spiral clasifiers (screw conveyors).

The capacity is so low that once a day, a front end loader clears the ash piles.

Be careful with the interface between the fire grate and the sluice.

On this particular installation the design was prone to occasional blockages, and I lost a very good friend Jhonnie Stukkie, who was burned to death trying to unblock dryer number 6 fire box from below, which was the only access point.

LSL Tekpro ■

For 5 T/hr you can use a small industrial scale submerged ash conveyor rather than the large versions you see at the back of power stations. There are lots about. ■

You are most welcome..the pleasure is ours as they say.. ■