Numerical Simulation And Advanced Control Of SCR Flue Gas Denitrification

Nitrogen oxide is generally accepted as one of the main air pollutants. Selective catalytic reduction (SCR) becomes the main choice in controlling the emission of NOx in coal-fired boiler because of its higher denitrification rate. In our country SCR denitrification technology is now still just beginning, therefore, in order to provide the mechanism models and corresponding control technology, finally provide the research platform for SCR denitrification device, methods such as studying the related mechanism of SCR and building the simulation system of SCR denitrification reaction obviously have their theoretical significance and scientific value.The main work of this article is as followed: first focus on SCR denitrification system as research object and build the mathematical models of SCR reactor; carry out numerical simulation with catalyst parameters and working conditions; discuss the related technology of soft sensor and control in SCR flue gas denitrification; finally use the work mentioned before to establish the SCR simulation platform based on Matlab.This article first deduces the basic kinetic models of SCR from the reaction mechanism combined with the theory of gas-solid catalytic reaction. Mathematical models according to the specific honeycomb catalyst include material balance equations of catalyst wall surface and channel. And then, from the numerical simulation of foregoing models, we can obtain the key influencing factors on denitrification rate and the gas concentration distribution in the catalyst inside. Results of numerical simulation can provide guidance for the catalyst making and reactor designing. Then, article carrys out the discussion of control technology in SCR denitrification, including soft-sensing technique and advanced control technology, which realize the modeling and controlling of production index such as denitrification rate. At last, basing on the foregoing work, we build the SCR flue gas denitrification platform in Matlab. The platform can provide simulating and debugging environment for SCR flue gas denitrification, therefore provide the gross reference and guidance for research on SCR flue gas denitrification, which have certain theoretical and practical significance.