In FBC boilers, the bed ash is usually extracted from the lower part of boiler through a certain number of drain pipes. From the drain pipes, the ash is loaded into the FLUIMAC extractors, which perform a double function:

Cool the ash

Convey the ash to downstream equipment

The heart of the FLUIMAC extractor is the Magaldi Superbelt. Through a special distributing device, the ash is extracted uniformly from the drain pipe by the belt. The Superbelt runs at a very low speed, and during the conveying on the belt the ash is cooled. The cooling medium is air, and no water is required.

The Magaldi Superbelt is installed inside the casing of the FLUIMAC extractor, which is completely sealed. Inside the casing, a negative pressure is maintained, so a small, controlled amount of cooling air is drafted from the ambient into the FLUIMAC extractor through inlet valves on the casing.

From the FLUIMAC, the cooled ash is discharged into the downstream processing equipment. The cooling air, heated by the hot ash, leaves the FLUIMAC through an air duct connected to a fan or to a negative pressure point in the boiler circuit.

Since the ash is delivered dry, there are several different possibilities for the configuration of the equipment downstream of the FLUIMAC extractor:

Mechanical conveying to a silo or bin with Postcooler conveyors

Pneumatic conveying to a silo or bin

Discharge into a pit or a container, or into an existing ash conveying system

The negative pressure inside the FLUIMAC extractor is maintained by the connection of the FLUIMAC air outlet to a fan or to a delivery point at a lower pressure in the boiler circuit.