循环流化床中塑料粉与稻壳共燃生成NO的研究

Study on NO Emissions from Co-combustion of Plastic Powder and Rice Hull in CFB

为研究塑料与稻壳共燃的氮氧化物生成规律,在自行设计的循环流化床装置上进行了二者的共燃实验。研究了温度、塑料粉和稻壳的混合比例及过量空气系数对NO生成量的影响。实验结果表明,随温度升高,NO生成量升高;随塑料粉与稻壳混合比例增加,NO生成量呈降低趋势,且NO的生成量低于二者单独焚烧时生成量的线性叠加;随着过量空气系数增加,NO生成量降低。为寻找二者共燃NO生成的一般性规律,采用径向基神经网络建立了NO生成的预测模型,预测结果显示该模型具有很高的精度。

In order to study the law of NO emissions from co-combustion of plastic powder and rice hull, the co-combustion experiments were performed in CFB designed by ourselves. The influences of combustion temperature, the ratio of plastic powder to rice hull and stoichiometric coefficient on the emission of NO were studied. Experimental research showed that NO emissions are increasing with the increase of temperature, NO emissions are decreasing with the increase of ratio of plastic powder to rice hull, and the NO emissions was lower when co-combustion than the weighted arithmetic mean of NO emissions when these two fuels combusted separately, NO emissions will be decreased with the increase of stoichiometric coefficient. In order to search the general law of NO emissions from co-combustion of plastic powder and rice hull, a predicting model of NO emissions based on radial basis function neural network was set up and the forecasted results showed that this model was accurate.