Effects of Water Vapor on the Pyrolysis Products of Pulverized Coal

This study presents a method to analyze the effects of water vapor on the pyrolysis products of pulverized coal by using a software Factsage, which is different from existing numerous experimental approach. Water vapor can enhance the formation of the N-containing compounds NH3 and HCN, and also improve CO and H2 yields during pulverized coal pyrolysis, which is helpful to restrain NOx formation during the pulverized coal combustion, because NH3 and HCN, as CO and H2, can reduce NOx if the atmosphere is in the condition of deoxidization. However, if it is in the condition of oxidization, they can increase NOx. It is found that a certain amounts of water vapor added can be extremely useful for NOx reduction if the atmosphere of pulverized coal combustion is well controlled.