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Ash Handling System



Delair has been able to save production and energy cost for many thermal and cement plants by installing its wide range of Refrigeration, Adsorption Compressed Air Dryers and Customized / Engineered compressed air dryers. Some of the satisfied customers who have installed Delair Dryers in their manufacturing units include:

  • NTPC
  • Ennore Thermal Power Station
  • Rjasthan Vidhut Nigam Ltd
  • Indraprastha Power Station
  • Tamil Nadu Electricity Board
  • Hindalco Industries
  • KORBA, Chattisgarh
  • West Bengal Power Corporation Ltd


Pressure Conveying System

Bulk material is conveyed by air under pressure. This system offers advantages of conveying material from one point to another or to a number of discharge points. The system is composed of a blower or a fan, rotary lock, cyclone separator, divertor, piping and fittings bag filter. Pressure conveying system needs dry compressed air to transport dry fly ash from the surge hopper to the silo for ash storage. Here, the dry ash is mixed with the compressed air and then the mixture is conveyed through the pipeline which runs upto the storage silo where the ash is discharged and the air is released into the atmosphere after filtration. If moisture is present in the compressed air stream, the ash gets moistened, sticking to the sides of the pipeline leading to scale formation and corrosion of pipes.


Moisture in compressed air stream leads to :
  • Corrosion in pipes, ash intake valves, air intake valves and other components.
  • Increased downtime and maintenance costs of pneumatic controls.
  • Contamination and damage at points where the compressed air comes directly in contact with sensitive materials.
  • Rust and scale formation in pipelines, silos.
  • Sluggish and inconsistent operation of air valves.
  • Malfunctioning of pneumatic shutters.


The Delair solution

There can be tremendous saving of energy costs, if the compressed air is dried upto 2 to 5°C PDP (Pressure Dew Point) i.e corresponding to (-)20°C ADP (Atmospheric dew point) instead of (-) 20°C PDP corresponding to (-)40°C  ADP respectively. This is the most cost effective solution for removal of moisture from the compressed air stream.

Delair engineers suggest installation of Refrigeration Type Dryers since in Heatless Type Dryers air is wasted for purges process of regeneration of the towers.


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