BOTTOM AND FLYING ASHES PRODUCED BY CEREALS COMBUSTION
Ing. Roberto Gaietta, CO.M.I.GE. s.r.l.- PAVIA - comige@comige.it - www.comige.it - www.energymais.info
In every combustion process, there is a production of bottom ashes and flying ashes in a quantity that depends by the characteristics of the burned product, and by the efficiency of the combustion system.
In the cereals combustion, the main problem is the ash melting at low temperature.
The ashes produced by burning corn seeds melt at a very low temperature (about 750°- 800°C) than agglomerate in a mass that when cooled becomes like a glass and very hard (clinker), and clog some parts of the plant.
We solved this problem with an accurate control of the inner temperatures of the combustion chamber.
Another problem is the quantity of the ashes: it is impossible to obtain a complete combustion like with the fossil fuels, that is to burn the 100% of the biomass, but will remain always residues in a quantity that depends by the combustion efficiency and by the characteristics of the biomass.
We remember that typical values of the ashes are from min. 4-5% (cereals) to 7-10% (straw) to 20-25% (wastes).
Our result, with the improvement of the cyclonic burner "ENERGYMAIS", after the first test with 4% ashes, is now 1-2% ashes, that is really the lowest value compared to any other combustion system.