DFC Dry Flight Conveyor
The Dry Flight Conveyor (DFC) is a mechanical chain and flight conveyor that continuously transports high temperature, dry or moist abrasive material. The DFC is commonly considered for applications where a pneumatic system is undesirable due to combustibles present in the material conveyed. Typical applications include economizer systems, selective catalytic reduction (SCR) units, atmospheric fluidized bed boiler (AFBC) units, and cement discharge from the kiln.
Its modular construction provides maximum flexibility in routing the DFC to the equipment it will serve and can be configured from horizontal to vertical arrangements. In addition, the conveyor’s low profile design allows it to be adapted to installations where headroom is limited. Multiple configurations are available to match capacity, size and performance to your specific needs.
The DFC is a completely closed trough with motor-driven chain and flights. Ash from the hopper drops through the return flights and onto the bottom of the conveyor. The chain/flight assembly moves the material to the discharge chute. The chute can lead to a storage tank or bottom ash system, such as the Submerged Flight Conveyor (SFC).
- Continuous ash removal minimizes clinkering in hoppers. The DFC is highly recommended when calcium oxide content of the ash is 15% or greater.
- The enclosed trough can maintain economizer vacuum to reduce clinkering with the use of airlock dump gates on the discharge.
- Accommodates a variety of ash types and particle sizes, including lumps
- Several standard modules allow for horizontal, inclined and vertical motion. Accommodates installations with minimum headroom.
- Designed to withstand high temperature material (up to 800° F) without damage to conveyor
- Premium construction for highly reliable 24/7 performance
- Bottom plate of ½” thick abrasion resistant steel and 3/8” thick abrasion resistant side liners minimize wear.
- Chain links are drop forged from high chrome/magnesium steel with a core hardness of 300-400 BHN. The entire link is then case hardened to 500-650 BHN for wear resistance.
- Drive shaft runs in self-aligning double-row roller bearings designed for long life. Chain sprockets on the drive shaft are induction hardened to 560 BHN to maximize life.
- Modular construction reduces cost and design time, improves installation accuracy, and minimizes spare part requirements
- Low maintenance as a result of low speed operation and wear-resistant components
- Low horsepower drive assembly minimizes power consumption
Can DFC’s be configured vertically for some material?[+]
Yes, DFC’s can be run vertically for some material with chain and flight.
What is used to isolate the DFC’s from the hoppers above?[+]
For DFC economizer systems that discharge into an SFC, an airlock between two DFCs is most common, but rotary vane feeders have also been used just below the hopper flanges.
What determines the use of a single vs. double strand chain?[+]
Double strand chains are typically used when particle size is too big to convey with a single chain.
What is the maximum temperature that a DFC can stand without damage to the conveyor?[+]
The DFC is designed to withstand temperatures up to 800°F (427°C).
Pipe/Fittings – Expansion joints Mechanical System Components – DFC VFD, chain, flights, bearing, idlers