Volumetric Feeders


Volumetric Coal Feeder is a special variant of Chain Conveyors. Backed by many years of experience in manufacturing of Chain conveyors, DEMECH has also executed number of orders for Volumetric Coal Feeders for prestigious clients.

Gravimetric Feeders are better suited for measured feeding of coal for firing but low cost Volumetric Feeders are commonly used for small boilers and Fluidized bed boilers. Lignite fired boilers also use Volumetric chain feeders due to high moisture contents and sticky nature of Lignite.

Demech has entered into technical collaboration with Hitachi Power Europe GmbH (HPE), Duisburg, Germany; to manufacture Volumetric Coal Feeders. This gives Demech the unique advantage to supply Volumetric Coal Feeders using the proven and reliable designs of Hitachi Power Europe GmbH.

Technical Details

Volumetric coal feeder is basically a drag-chain en-masse conveyer with an externally adjustable bed height controller. The cross-section area at the bed height controller and the speed of the bed of material gives the volumetric measurement of the coal. The variation in coal flow is achieved by either adjusting the coal bed or varying the chain speed using variable frequency drive.

These feeders always have a horizontal profile with capacities upto 120 T/H and lengths of even 25 meters.

The other construction is similar to Chain Feeders with additional safety features as per the requirements of customer. The chains used by DEMECH are Drop forged chains, with single strand or double strand construction as per the capacity requirements.

Applications area

Measured coal feeding is the primary application of this feeder. Its low cost makes it attractive for small boilers and Fluidized bed boilers. These feeders when added with some special features, are used for Lignite fired boilers.

Salient Features
  • DEMECH designs and supplies Volumetric Coal Feeders as per customer specific requirements.
  • Long term collaboration agreement with Hitachi Power Europe GmbH ensures knowledge of best design engineering and new developments taking place to give better systems.
Clients Served
  • BHEL, Trichy
  • Rajasthan State Electricity Board
  • Thermax Limited, Pune
  • Greenesol Power Systems Pvt.Ltd, Chenenai
  • ThyssenKrupp Ind. Pvt.Ltd., Pune
  • Shriram EPC Limited, Kolkata