Pulverized Coal Burners
The Pulverized coal can be burnt with less or excess air similar to the burning of liquid or gaseous fuels. The method of obtaining the pulverized coal has been discussed in the previous section. Here we are concerned with the required burners for burning the pulverized coal.
The various requirements of pulverized coal burners are :
- There is stability of ignition.
- It should thoroughly mix the coal and primary air, bring this mixture in contact with secondary air to create sufficient turbulence.
- Ensure complete combustion.
- Control flame size and shape.
- Ensure adequate protection against overheating and excessive abrasive power.
The factors which affect the performance of pulverized coal burners are :
- Characteristics of coal used.
- Grain size of powdered coal.
- Quantity of volatile matter in coal.
- Geometry of coal burners.
- Ratio of primary and secondary air used.
- Furnace design.
- Load on the plant.
- Method of mixing of coal and primary air.