优化城市污泥与棉秆掺混燃烧条件的正交实验研究

Orthogonal experimental study to optimise the combustion conditions of blended municipal sludge and cotton stalks

以发热量为评价指标,通过正交实验优化城市污泥、棉秆掺混燃烧条件。结果表明,影响污泥混合物发热量的主次因素为棉秆掺混比>搅拌时间>掺混粒径,最佳掺混条件为棉秆掺混40%,搅拌时间5 min,掺混粒径0.075 mm。最佳掺混条件下,城市污泥着火、燃尽温度显著降低,发热量提高了34%,综合燃烧特性指数增大了3.97倍,活化能降低了12.74 kJ/mol,燃烧过程中污泥、棉秆几乎全程处于正向促进作用阶段。

Taking heat generation as the evaluation index,the orthogonal experiment was used to optimize the combustion conditions of blending municipal sludge and cotton stalks.The result showed that the primary and secondary factors affecting the heat generation of the sludge mixture were cotton stalks blending ratio>stirring time>particle size of blending,and the optimal blending conditions were 40%of cotton stalks blending,stirring time of 5 min,and blending particle size of 0.075 mm.Under optimal mixing conditions,the ignition and combustion temperatures of urban sludge were significantly reduced,the heat generation was increased by 34%,the comprehensive combustion characteristic index was increased by 3.97 times,the activation energy was reduced by 12.74 kJ/mol,and the sludge and cotton stalks were in the stage of positive facilitation in the combustion process almost the whole time.