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针对700 MW锅炉主、再热蒸汽温度偏低、蒸汽温度偏差较大以及氮氧化物排放量偏高的问题,开展了低氮燃烧改造,采用三菱基于深度空气分级思想的MACT(Mitsubishi Advanced Combustion Technology)燃烧技术和M-PM(Multiple-Pollution Minimum)低NOx燃烧器,并进行了燃烧优化调整。改造及运行调整后,锅炉主、再热蒸汽温度达到设计值,两侧偏差基本消除,过热器和再热器均无超温风险,NOx排放量低于150 mg/Nm3,锅炉效率有所提高。结果表明,通过低氮燃烧改造和运行优化调整,协同实现了提高锅炉蒸汽温度和降低NOx排放的目的,提高了锅炉的安全、经济和环保性能。
Aiming at the problem of main boiler of 700 MW, low temperature of reheat steam, large deviation of steam temperature and high emission of nitrogen oxides, a low-nitrogen combustion retrofit was carried out. Mitsubishi Advanced Combustion Technology (MACT) ) Combustion technology and M-PM (Multiple-Pollution Minimum) low-NOx burner, and the combustion optimization adjustment. After modification and operation adjustment, boiler main and reheat steam temperature reached the designed value, and the deviation on both sides was basically eliminated. There was no over-temperature risk for the superheater and the reheater. The NOx emission was lower than 150 mg / Nm3 and the boiler efficiency was improved . The results show that, through low-nitrogen combustion retrofit and operation optimization and adjustment, the goal of raising boiler steam temperature and reducing NOx emissions is achieved synergistically, and the safety, economy and environmental protection performance of the boiler are improved.