Analysis and diagnosis of SCR denitrification system in 330 MW lean coal-fired boiler

To solve the low efficiency and the short life of the catalyst in the SCR denitrification system of a 330 MW coal-fired thermal power plant,field test and analysis were conducted.The flue gas concentration,temperature field and velocity field were measured using flue gas analyzer,temperature test equipment,and flow test instrument etc.The results show that the flow field and temperature field were inhomogeneously distributing during operation.This is thought be the main factor for the low denitrification efficiency and the catalyst abrasion.On the basis of measurement results,the critical issues in the operation process were systematically investigated and confirmed.It provides suggestions for the optimization and operation of the thermal power plant,and offers available reference for the engineering practice and stable operation.