Low-NOx Combustion Retrofit and Running Adjustment for 600-MW Utility Boiler with Four-Corner Tangential Firing

Low-NOX combustion retrofit is performed by adopting staged combustion technology for a 600 MW utility boiler with a four-corner tangential firing system. The emission data of NOX before and after retrofit are compared and analyzed. The test results show that the emission concentration of NOX decreases obviously after the low-NOX retrofit. Additionally, the emission of NOX decreases by nearly 50% when the unit load is higher than 350 MW. It can also be concluded that the emission of NOX is influenced significantly by the amount of SOFA, the damper opening of auxiliary air, the differential pressure between the secondary air windbox and the furnace, and so on.

9FA燃气轮机燃烧系统故障原因分析及改进

介绍了上海漕泾热电有限责任公司9FA+e燃气轮机干式低NOx排放燃烧系统DLN2.0+的部件故障情况,从燃料热值变化、机组运行工况、系统设计等方面分析了燃烧部件故障的原因,主要问题是天然气气源复杂、热值波动大引起燃烧脉动高,造成燃烧部件出现异常损坏。为解决此问题给机组安全运行带来的不利因素,提出将燃烧系统升级改造至DLN2.6+,使燃气轮机适应现有天然气热值的变化。