Effects of Inorganic Additives on Slagging Characteristics of Peanut Shell Pellet Fuel

In order to alleviate the problem of slagging caused by biomass combustion, this paper studied the slagging characteristics of peanut shell shaped granular fuel under different inorganic additives and their mixing ratios. X-ray fluorescence spectroscopy, X-ray diffraction and five evaluation indexes, such as contamination index, iron-calcium ratio, alkali-acid ratio, silicon ratio and silicon-aluminum ratio, were used to analyze the ash generated by the combustion of peanut shell shaped granular fuel. The results showed that the more acidic oxides, the less alkaline oxides, the higher the ash melting point, the less easy to slag, that is, the smaller the alkali-acid ratio, the less easy to slag. Comparing the values of the five evaluation indexes, such as contamination index, iron-calcium ratio, alkali-acid ratio, silicon ratio and silicon-aluminum ratio, it was found that the slag removal effect of kaolin additive was the best. Under the high temperature mode, the five evaluation indexes were 0.32, 0.56, 0.30, 0.79, 1.83, respectively. Under the low temperature mode, they were 0.17, 0.67, 0.25, 0.81, 1.68, respectively. It was obviously better than the slag removal effect of MgO, CaO or the proportional mixture of the three additives. This study provides a certain reference for reducing the slagging phenomenon generated by the combustion of peanut shell shaped granular fuel.