Submerged Chain Conveyors (SCC's) are commonly used for the continuous extraction of bottom ash from power station boilers. ■

I'm not knowledgeable on the intricacies of jet pumps, but imagine they do operate on a continuous extraction basis whereas SCC's do. ■

Hello Senior,

The question for ah discharge of either jet pump or submerged conveyor is where or for what purpose do you have for the ash ?

If its only to go to a ash lagoon, then pumping through a jet pump and pipes is ok.

If you want to use the ash for building blocks or cement addition then a scraper and truck or conveyor is the way to go.

We make many such situations for both.

We can specify / manufacture the pump and pipework , or the conveyor system. ■

Large boilers often produce lumps of bottom ash which resemble a small car in size & are very hot. SSCC's are then used because lumps that size & temperature cannot be pumped so easily.

Fly ash is used as a cement constituent. ■

SSCC's are Submerged Scraper Chain Conveyors & are the present norm for bottom ash removal. They generally have a lift of about 8m which is sufficient to load the bin where some drainage takes place before the ash is broken down for onward conveyance. SSCC's are built to move sideways from under the boiler during maintenance periods.

For comprehensive descriptions of ash disposal issues you should read an appropriate textbook covering large scale boiler operations & then consider your particular situation further. ■

Once saw a big one at ESCOM's Lethabo power station

EDIT

I was just thinking, how should you go about establishing the chain pull in a SCC?

In a normal "dry" conveyor it will be the weight of chain and material times a friction factor.

But if the chain and material is submerged surely it's a bit lighter due to the SG of the water therefore the chain pull should be a bit lower.

Comments anyone? ■

Hello Amit,

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Originally Posted by designer

Once saw a big one at ESCOM's Lethabo power station

EDIT

I was just thinking, how should you go about establishing the chain pull in a SCC?

In a normal "dry" conveyor it will be the weight of chain and material times a friction factor.

But if the chain and material is submerged surely it's a bit lighter due to the SG of the water therefore the chain pull should be a bit lower.

Comments anyone?

True: as long as there is water in the trough. Imagine the submerged scraper chain conveyor, SSCC, has been sidestepped from under the boiler & stands while the maintenance crew do their things aloft. Water will leak out & if the thing hasn't been cleaned then the gadget might have to start up dry to clean it out for maintenance on said gadget, the SSCC. So the chain pull must be adequate for dry working.

I must use that in future design reviews. ■

Originally Posted by louispanjang

True: as long as there is water in the trough. Imagine the submerged scraper chain conveyor, SSCC, has been sidestepped from under the boiler & stands while the maintenance crew do their things aloft. Water will leak out & if the thing hasn't been cleaned then the gadget might have to start up dry to clean it out for maintenance on said gadget, the SSCC. So the chain pull must be adequate for dry working.

I must use that in future design reviews.

But if I'd pulled it out sideways with a load of ash still in it, I'd be looking to get the back hoe of a JCB in there to drop the ash into a skip. ■