E303 Experimental Investigation of the Transformation of Pyridinic-nitrogen in Coal during Combustion by Means of Model Compounds

概要

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In order to better control the emissions of NO_x and N_2O during coal combustion special attention has been paid to the transformation of nitrogen functionalities in coal. It is difficult to understand the mechanisms due to the complex coal structure and the low nitrogen content in coal. Model compounds with simple structure and high nitrogen content, therefore, become the best substitutions of coal nitrogen functionalities in basic studies. In the experiment, pyridine, as model compounds, is studied to simulate the transformation of coal nitrogen. The experiments were carried out in a small electrically heated quarz flow reactor over the temperature range of 550℃-1020℃. Analysis of major products in volatiles was carried out using a Fourier Transform Infrared Radiation analyzer (Ft-IR). The experimental results show that the maximum emission of N_2O appears between 650℃ and 850℃. The N_2O will transform to NO and NO_2 after temperature increased further, which is similar to formation rules of NO_x in coal.
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