Dynamic modeling for SCR system of coal fired power plant

摘要

The dynamic model of the selective catalyst reduction (SCR) system is constructed based on the mechanism of denitration reactions. The adsorption-desorption of the reactants NH3 and NOx and the reactions between them are addressed independently. The model is verified by the actual operation data and the results show that the model reflects the dynamic characteristics of SCR system accurately. Furthermore, the effects of temperature and molar ratio of NH3/NOx on the SCR reactions are analyzed. The simulation results show that the surface coverage and the denitration efficiency increase with temperature when the concentration of NOx and NH3 are constant. Similarity, both of the two indexes increase with molar ratio and there is no change in ammonia escape.