Fuel blowing method

Abstract

This invention provides a method for creating a combustion environment sufficient for clinker calcination while utilizing ammonia-containing fuel. [Solution] This method comprises the steps of (a) injecting a second combustible gas, which is a mixture of ammonia gas and a first combustible gas that is more combustible than ammonia gas, and (b) injecting a combustion-supporting gas while step (a) is being performed. In step (a), the corrected composite momentum obtained by multiplying the composite momentum of the second combustible gas by the ratio of the lower heating value of the second combustible gas to the lower heating value of the first combustible gas is 0.4 [kg·m / s 2 ]~5.0[kg·m / s 2 The process is carried out under conditions that are within the range of ], and step (b) is performed by multiplying the synthesis momentum of the combustion-supporting gas by the ratio of the oxygen concentration of the combustion-supporting gas to the oxygen concentration of the air, and the corrected synthesis momentum of the combustion-supporting gas obtained is 1.0 [kg·m / s 2 ]~15.0[kg·m / s 2 It is executed under the condition that it falls within the range of [].

Claims

1. A fuel injection method for a rotary kiln used for cement firing, which involves blowing a fuel-containing airflow into the interior of the kiln through a burner, The burner has multiple flow paths separated by multiple concentric cylindrical members, The process includes (a) injecting a second combustible gas, which is a mixture of ammonia gas and a first combustible gas that is more combustible than the ammonia gas, through a combustible gas channel belonging to the plurality of channels, as the fuel, During the execution of step (a), step (b) is performed, in which a combustion-supporting gas consisting of at least primary air or a gas with a higher oxygen concentration than the primary air is blown in through a combustion-supporting gas channel belonging to the plurality of channels and different from the combustible gas channel, Step (a) is performed by multiplying the synthesis momentum of the second combustible gas by the ratio of the lower heating value of the second combustible gas to the lower heating value of the first combustible gas, thereby obtaining a corrected synthesis momentum of the second combustible gas of 0.4 [kg·m / s²] 2 ]~5.0[kg・m / s 2 It is executed under the condition that it falls within the range of ], Step (b) is performed by multiplying the synthesis momentum of the combustion-supporting gas blown in from the combustion-supporting gas flow path by the ratio of the oxygen concentration of the combustion-supporting gas to the oxygen concentration of the air, thereby obtaining a corrected synthesis momentum of the combustion-supporting gas of 1.0 [kg·m / s²] 2 ]~15.0[kg・m / s 2 A fuel injection method characterized by being performed under conditions that fall within the range of [ ].

2. The above step (a) is performed when the corrected synthesis momentum of the second combustible gas is 0.4 [kg·m / s 2 ]~2.5[kg・m / s 2 It is executed under the condition that it falls within the range of ], Step (b) is performed when the corrected synthesis momentum of the combustion-supporting gas is 1.6 [kg·m / s] 2 ]~8.0[kg・m / s 2 The fuel injection method according to claim 1, characterized in that it is performed under conditions that fall within the range of ].

3. The fuel injection method according to claim 1 or 2, characterized in that the first combustible gas is natural gas.

4. The fuel injection method according to claim 1 or 2, characterized in that at least one of the combustible gas passage and the air passage has a swivel angle of 40° or less with respect to the axial direction of the burner.

5. The fuel injection method according to claim 4, characterized in that at least one of the combustible gas passage and the air passage has a swirling angle of 10° to 40° with respect to the axial direction of the burner.

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