Similarly to pellet, grain has a very high heat value, so it needs only little silo space. All leftovers from grain separation and low-quality crops that do not serve the food industry are suitable for combustion.
Accessories and Devices in the Burning Process
In a bio plant, grain can easily be burned in a stoker burner. No special purpose-made burner is needed, if the stoker burner has a mechanical grate incinerator. If the stoker burner does not have a mechanical grate incinerator, the large amounts of ash which are produced during combustion of grain solidify into hard stones.
Ash solidification leads to the constant need of cleaning the burner, and in worst-case scenario, causes the risk of backfire in the heating system. However, with a mechanical grate incinerator burning of grain in a stoker burner is successful. Also, adding lime in the grain has been noted to decrease ash solidification.
If grain is regularly used as fuel, it is advisable to have an automatic ash extractor in the burner. Even with small fuel volumes you might have to empty the ashes once a day, which makes the use of grain extremely laborious.
When burned, grain pops and the end-product is an empty, ashy shell. Burning grain smells like freshly baked bread.
Grain in a nutshell:
- high heat value
- needs relatively little storage space
- also low-quality crops can be utilised