SCR process is using reductant to take place selective chemical reaction with nitrogen oxide(mainly NO, NO2) under the effect of catalyst and then generate nitrogen and water.
　　SCR reactor is installed between boiler economizer and air pre-heater. The reaction temperature range is 320℃-420℃.
　　The reductant of SCR process can be liquid ammonia, urea and ammonia.

　　SCR process chemical reaction equation is as below
　　4NH3＋4NO＋O2＝4N2＋6H2O
　　4NH3＋2NO2＋O2＝3N2＋6H2O
　　2CO(NH2)2＋4NO＋O2=4N2＋4H2O＋2CO2
　　2CO(NH2)2＋2NO2＋O2=3N2＋4H2O＋2CO2

　　The reductant is core in the SCR process. Design and selection of catalyst is determined by gas condition and composition. The major elements which will affect design are NOx removal rate, NH3 escape rate and volume of catalyst. At present, main types of catalyst are plate type, honeycomb type, corrugated type.
　　SCR flue gas De-NOx process is the most mature and reliable technology. The max De-N0x efficiency is over 90%.The SCR process guarantees not only De-NOx efficiency but also effective control of NH3 escape rate and conversion rate of SO2 into SO3.

　　Technical features        
　　-- Optimizing design of duct, guiding plate, ammonia injection grid , ammonia and flue gas mixer by CFD simulation which can increase system reaction efficiency and decrease ammonia consumption, and make SCR system operate safely and stably.
　　-- Our company have rich experience in steel structure design, site erection and experience of erection management.