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| Application of Staged Combustion Technology in 5 000t/d Clinker Production Line |
| China United Cement Lunan Co., Ltd. , Tengzhou Shandong 277531, China |
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Abstract The mechanism of NOX generation in cement production is analyzed, and the technological transformation process of staged combustion technology is introduced. By transforming the combustion system of the calciner, optimizing the tertiary air duct, improving the C4 discharge pipe, updating the splash boxes, optimizing the position of the spray gun of the SNCR system, and refining the system operation, under the condition that the NOX emission concentration of cement kiln flue gas is
<100mg/Nm3, the amount of ammonia water (20% concentration) in the SNCR system is about 4.1kg/t clinker, which is reduced by more than 50% than before the transformation. Before the transformation, the average ammonia escape emission concentration was 1.71mg/Nm3, and the qualified rate below 8mg/Nm3 was 93.42%; After the transformation, the average ammonia escape emission concentration is 0.27mg/Nm3, and the qualified rate below 8mg/Nm3 is 100%.
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Received: 25 July 2021
Published: 25 March 2022
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