Direct Ignition of Pulverized Coal

Direct Ignition of Pulverized Coal-

Very recently Damodar valley corporation organization has setup a very unique direct ignition of pulverized coal system in one of the power plant. Why direct ignition of pulverized coal system is unique is known by you by the end of the article.

There are mainly two types of solid fuel firing system

  1. Hand firing
  2. Mechanical stroke firing

 

Disadvantages of earlier ignition methods –

  • Initial cost, running cost of this plant is quite high as separate pulverization plant to installed and run additionally.
  • High temperature causes high thermal loss through flue gas.
  • This type of method of boiler firing has always a risk of explosion.
  • This is also difficult and expensive to filter fine ash particles from fine gas. Moreover, the quantity of ash particles in the flue gas is more in pulverized system.

 

Need of direct ignition of pulverization coal

Pulverized coal is ignited, to furnish energy for warm-up or low load operation of a coal burning furnace, by a technique which does not require the combustion of significant quantities of liquid or gaseous fuels. The direct ignition of pulverized coal in accordance with the present invention contemplates the delivery of a dense phase coal/air stream to an ignition zone where it receives ignition energy and the thus ignited mixture is thereafter contained in a recirculation region until the flame becomes self-sustaining.

 

Benefits of direct ignition of pulverization coal

  • Low Initial cost, running cost of this plant
  • No risk of explosion
  • Maintained temperature hence low thermal losses
  • Less difficulty to filter fine ash

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