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 compare...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.展开更多
基于多点贫油直喷(Lean Direct Injection,LDI)径向分级技术对某型燃烧室进行改型设计,采用数值模拟法研究了主燃级旋流器旋向及低工况下主燃级工作模式对燃烧性能的影响。研究表明,设计工况下主燃级旋流器旋向会影响到两级旋流器之间...基于多点贫油直喷(Lean Direct Injection,LDI)径向分级技术对某型燃烧室进行改型设计,采用数值模拟法研究了主燃级旋流器旋向及低工况下主燃级工作模式对燃烧性能的影响。研究表明,设计工况下主燃级旋流器旋向会影响到两级旋流器之间的剪切作用,会改变中心值班级的回流区范围与旋流强度。模型Ⅰ(主燃级与值班级旋向相同)的出口温度分布系数和NOx生成量均大于模型Ⅱ(主燃级与值班级旋向相反)。30%工况下对比了3种工作模式,不喷油的主燃级回流区径向尺寸缩小,与中心值班级接近,模式1(模型Ⅱ,同向主燃级工作)的回流区轴向尺寸最长,出口温度分布系数最小;模式0(模型Ⅰ,间隔主燃级工作)的中心值班级高温区轴向分布最长,主燃级低温区轴向分布最短,模式2(模型Ⅱ,反向主燃级工作)的中心值班级高温区轴向分布最短;NOx生成量上,模式0最低,模式1最高,模式2的整体性能最优。展开更多
文摘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.
文摘基于多点贫油直喷(Lean Direct Injection,LDI)径向分级技术对某型燃烧室进行改型设计,采用数值模拟法研究了主燃级旋流器旋向及低工况下主燃级工作模式对燃烧性能的影响。研究表明,设计工况下主燃级旋流器旋向会影响到两级旋流器之间的剪切作用,会改变中心值班级的回流区范围与旋流强度。模型Ⅰ(主燃级与值班级旋向相同)的出口温度分布系数和NOx生成量均大于模型Ⅱ(主燃级与值班级旋向相反)。30%工况下对比了3种工作模式,不喷油的主燃级回流区径向尺寸缩小,与中心值班级接近,模式1(模型Ⅱ,同向主燃级工作)的回流区轴向尺寸最长,出口温度分布系数最小;模式0(模型Ⅰ,间隔主燃级工作)的中心值班级高温区轴向分布最长,主燃级低温区轴向分布最短,模式2(模型Ⅱ,反向主燃级工作)的中心值班级高温区轴向分布最短;NOx生成量上,模式0最低,模式1最高,模式2的整体性能最优。
