Combustion method and apparatus for NOx reduction
AssigneeMiura Co., Ltd.
InventorsToshihiro Kayahara, Noboru Takubo
Life of this patent
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Abstract
Combustion method and apparatus for NOx reduction and CO reduction which are capable of easily achieving super NOx reduction with the value of exhaust NOx under 10 ppm. The combustion method for NOx reduction by controlling the temperature of combustion gas derived from a burner includes in combination the steps of suppressing combustion gas temperature by heat absorbers; suppressing the combustion gas temperature by recirculating burning-completed gas to a combustion-gas burning reaction zone; and suppressing the combustion gas temperature by adding water or steam to combustion-use air of the burner, whereby the temperature of the combustion gas derived from the burner is suppressed.
Claims16
A combustion method for NOx reduction by controlling temperature of combustion gas derived from a burner, comprising in combination the steps of:
- suppressing combustion gas temperature by heat absorbers;
- suppressing combustion gas temperature by recirculating burning-completed gas to a combustion-gas burning reaction zone;
- and suppressing combustion gas temperature by adding water or steam to combustion-use air of the burner, whereby the combustion gas temperature is suppressed.
A combustion apparatus for NOx reduction by controlling temperature of combustion gas derived from a burner, comprising:
- first suppression means for suppressing combustion gas temperature by heat absorbers provided in a burning reaction zone;
- second suppression means for suppressing combustion gas temperature by recirculating burning-completed gas to the combustion-gas burning reaction zone;
- and third suppression means for suppressing combustion gas temperature by adding water or steam to combustion-use air of the burner.
A combustion apparatus for NOx reduction by controlling temperature of combustion gas derived from a burner having a burning reaction zone and an exhaust gas passage, comprising:
- heat absorbers provided in the burning reaction zone for suppressing combustion gas temperature;
- an exhaust gas recirculation passage connected to the exhaust gas passage for recirculating burning-completed gas to an air supply passage, and a line feeding water or steam to the exhaust gas recirculation passage upstream of the burner.
A combustion method for NOx reduction by controlling temperature of combustion gas derived from a burner, comprising the steps of:
- suppressing combustion gas temperature by heat absorbers;
- recirculating burning-completed gas to a combustion-gas burning reaction zone;
- adding water or steam to combustion-use air of the burner;
- and
- burning the burner as a fully-premixing type burner at high excess air ratio;
- whereby NOx emissions are maintained at a level of 10 ppm or less, at 0% O2 in an exhaust gas, dry basis.
A combustion method comprising the steps of:
- burning fuel to produce gasses and exhaust gasses;
- and
- maintaining a NOx level in the exhaust gasses at no more that 10 ppm or less, at 0% O2, dry basis;
- wherein said step of maintaining a NOx level in the combustion gasses at no more that 10 ppm comprises the steps of:
- suppressing combustion gas temperature by heat absorbers;
- recirculating burning-completed gas to a combustion-gas burning reaction zone;
- and
- adding water or steam to combustion-use air of the burner.
Dependencies are inferred from the claim text.