Burning fuels, particularly for incinerating garbage
AssigneeMartin GmbH fuer Umwelt- und Enetgietechnik
InventorsJohannes Josef Edmund Martin, Joachim Horn, Michael Busch
Life of this patent
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Abstract
A method for burning fuels, particularly garbage, in incinerators with a stoker grate, for which the primary air is supplied below the stoker grate into the fuel layer and the secondary air is supplied above the fuel layer, is controlled in such a way that the intensity of the combustion of the fuel on the stoker grate is increased by increasing the oxygen content of the primary air and the intensity of the combustion in the secondary combustion zone is choked by decreasing the oxygen content in the secondary air. Flue gas, preferably from the combustion process, is recirculated in order to reduce the oxygen content of the secondary air.
Claims20
In a method for burning fuels in incinerators with a stoker grate, for which primary air is supplied into a fuel layer from below the stoker grate and secondary air is supplied above the fuel layer, the improvement comprising the steps of:
- increasing the intensity of combustion of the fuels on the stoker grate at least partially by increasing the percentage of oxygen in the primary air, so that the surface temperature of the fuel lies in the range of 800.degree. C.-1,200.degree. C.;
- and
- choking the intensity of combustion in a secondary combustion zone by decreasing the percentage of oxygen in the secondary air, so that the temperature in the secondary combustion zone lies in the range 800.degree. C.-1,100.degree. C., the decreasing of the percentage of oxygen in the secondary air being accomplished by using recirculated flue gas in the secondary air.
In a process for the combustion of fuels in a combustion installation with a grate furnace in which primary air is supplied below the grate furnace in a fuel bed and secondary air is supplied above the fuel bed, the improvement comprising:
- increasing a combustion intensity of fuel on the furnace grate at least in some areas of the furnace grate by increasing a proportion of oxygen in the primary air to 25-50 vol. % with a resulting percentagewise reduction in a proportion of nitrogen in the primary air relative to surrounding air;
- and
- above the fuel bed after oxidizable pollutants are eliminated, choking a combustion intensity of a secondary combustion zone by reducing a proportion of oxygen in the secondary air relative to the surrounding air by recirculating flue gas, wherein the recirculated flue gas makes up 20-65% of a total amount of air and gas supplied above the fuel bed.
Dependencies are inferred from the claim text.