少油点火燃烧器运行优化数值模拟  

Numerical Simulation on the Operation Optimization of Tiny Oil Ignition Burner

作　　者：黄香彬 汪华剑[2] 白鹏[2] 严响林[2] 

机构地区：[1]神华国华清远发电有限责任公司,广东英德513000 [2]西安热工研究院有限公司,陕西西安710032

出　　处：《中国电力》2017年第10期104-109,115,共7页Electric Power

摘　　要：对用于330 MW锅炉的少油点火燃烧器建立了精细的物理模型,建模包括了一次风和周界风流动区域以及燃烧器壁厚区域。对燃用烟煤点火情况下燃烧器内部复杂区域的流动、燃烧以及流固耦合传热进行三维数值模拟,比较油枪燃油量对燃烧器点火性能以及壁面温度的影响,对燃油量进行了优化。监测点壁面温度模拟值与实际测量值符合较好。计算结果表明,适当降低燃油量不仅不影响点火性能,还可以降低燃烧器壁面温度。实际运行结果表明,在油量为80 kg/h时燃烧器出口平均温度和最高温度有所下降,各项指标和参数正常,满足成功点火的需要。A precise physical model is developed for the tiny-oil ignition burner in a 330 MW tangentially-fired boiler, including the primary air, the surrounding air and the burner thick wall areas. The three dimensional numerical simulation on the fluid flow process, combustion and fluid-solid coupled heat transfer in these areas are conducted under the bituminous coal combustion conditions. The effects ofoil gun flow rate on the ignition performance and the wall temperature are carefully analyzed for the oil flow rate optimization. Tbe calculated temperature matches well with the measured value at the monitoring points. The calculated results show that appropriate oil flow rate reduction not only has little side effect on the ignition performance, but also can lower the wall temperature of the burner. Theoretically the oil flow rate should be kept at 70 kg/h as the minimum requirement for the coal type of the boiler. In practical operation it can be adjusted to 80 kg/h to ensure sufficient secure margin. According to the practical operation data, with the oil flow rate at 80 kg/h, although the maximum and average temperatures at the burner exit have all been somewhat decreased, the operation parameters and indices of the boiler still remain normal and meet all the requirements for successful ignition.

关 键 词：燃煤发电机组 少油点火燃烧器 烟煤 油量优化 数值模拟 

分 类 号：TM621.2[电气工程—电力系统及自动化]