基于多级配风的小麦秸秆捆燃烧特性与排放研究

Study on burning characteristics and emissions of wheat straw bales based on multi-stage air distribution

针对小麦秸秆捆燃烧过程中存在的燃烧效率低、烟气污染物排放规律不明确等问题。文章基于多级配风捆烧锅炉开展小麦秸秆捆燃烧试验,通过测试分析不同配风条件下的小麦秸秆捆燃烧特性与烟气排放规律,优化了小麦秸秆捆燃烧过程中的过量空气系数。试验结果表明:当捆烧锅炉的过量空气系数为1.6时,烟气中CO_(2)的质量浓度达到最低,为8 830.14 mg/m^(3),NO和NO的质量浓度也较低,分别为146.67 mg/m^(3)和225.15mg/m^(3);烟气中颗粒物的数量浓度呈单峰分布,质量浓度呈双峰分布,过量空气系数为1.6,1.8和2.0时,烟气中颗粒物的数量浓度和质量浓度均较低。

To solve the problems of low combustion efficiency and unclear emission law of flue gas pollutants, during wheat straw bale burning process, a wheat straw bale burning experiment was carried out, which based on a multi-stage air-balancing bale burning boiler. Combustion characteristics of straw bales and the law of flue gas emission, under different air distribution conditions, were analyzed. The excess air coefficient, during the combustion of wheat straw bales,was optimized. The results showed that the lowest CO_(2) emission value was 8 830.14 mg/m^(3), when the excess air coefficient of the bundled boiler was 1.6. Meanwhile, the emission concentrations of NO and NOwere 146.67 mg/m^(3) and 225.15 mg/m^(3), respectively. The quantity concentration of particles in flue gas was unimodal and the mass concentration was bimodal. When the excess air coefficient is 1.6, 1.8 and 2.0, the quantity and mass concentration of particles in flue gas were lower.