Hybrid coal handling plant works by the combination of mechanical system and pneumatic system. Mechanical system are used from coal unloading from wagon tippler/track hopper or both to crusher house and Pneumatic system are used from crusher house to coal bunkers and while reclaiming coal from stock area to coal bunker via crusher house .
Working Of Pneumatic System In Hybrid Coal Handling Plant
Pneumatic System is a material conveying system in which material moved over distance (horizontal + vertical) with the help of air (using +ve or –ve pressure of air). Material is forced through pipe/pipes and finally separated from the carrier air and deposited at the silo/hopper/bunker. The heart of pneumatic conveying system is its design that relies on proper pick-up velocity and an accurate calculation for pressure drop. Material velocity is also imported. Material to air ratio will be on higher side preferably more than 40/50:1 and provision of booster and minimum number of bend along the line will also result in for less requirement of air for conveying of coal. Motive force for this transfer comes from a combination of pressure differential and the flow of air. Pneumatic conveying systems are classified by their operating principle, i.e. dilute and dense phase.
Dilute phase – Pick up velocity at system start at its lowest speed operate at high velocity at low pressure differential (suspension flow).
Dense phase – low air velocity and high pressure differential (fluidized flow).
As pneumatic conveying system is not new for power sector (as Ash & Mill Reject are already handled by pneumatic conveying), Mill Reject material is more or less similar to crushed coal. Crushed coal may convey easily than the Mill Reject as the size of crushed coal will be 50 mm. In pneumatic conveying, dense phase is better option as it can convey as per capacity required.
Advantages Of Hybrid Coal Handling Plant
- Reduction in land use.
- Reduction in length of belt conveyor.
- Reduction in numbers of transfer points.
- Reduction in civil and structural quantity.
- Reduction in numbers of dust suppression unit.
- No dust in pneumatic conveying area.
- More practical and economical method to convey the crushed coal.
- Reliability and cost effectiveness through reduced land costs.
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