Abstract
The objectives of this study were to determine the fuel ash composition of corn stalk samples from 23 locations in Jilin province, China, and to estimate, via laboratory and theoretical methods, their ash-melting (slagging) behavior during combustion. The ash-forming matter is in general dominated by Si, K, Ca, and Mg, although there is large variation between the samples in fuel characteristics and contents of ash-forming main elements. The results from the alkali index, the ash fusion test, and the thermochemical model calculations all indicated that the corn stalk fuel showed moderate to high slagging tendencies during combustion. However, there are large differences in predicted slagging behavior for the different samples. Samples with a low K/(Ca + Mg) ratio showed moderate ash-melting temperatures in the American Society for Testing and Materials (ASTM) test and a moderate amount of melt in the temperature range of 1000−1200 °C in the thermochemical model calculations. In the samples with a high K/(...
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