Influence of alkali metal K on nitrogen conversion in co-combustion of coal and straw

The effects of alkali metal K on the release characteristics of NO during the co-combustion of a Tiefa coal deashed by acid washing and mixed with corn straw or different proportions of KOH were investigated using an online themogravimetric-gas chromatographic system. The results indicate that it is effective to inhibit the release of NO to add a certain proportion of straw in the deashed samples. As the proportion of straw increases, the peak number of release rate of NO gradually changes from one peak to two peaks. When the content of K increases in the deashed coal samples mixed with a low proportion of straw and KOH, it has a stronger catalytic effect on the reduction reaction of NO, and when the content of K reaches a certain value, the catalytic effect does not increase. The lower the O2 content in the combustion atmosphere, the better the reduction of NO.