By numerical simulation

the flow field in SCR denitrifcation reactor of a power plant boiler was investigated.Because the flue gas side and air side of the air preheater is left-right arranged

and the temperature difference of flue gas in vertical shaft around the heating surface at post part of the boiler is 60℃

the temperature difference of flue gas mixed with catalyst in width direction reaches 40℃.The patented technology:uniform flow device for sharp bend flue

can enlarge the contact area and improve the mixing effect of cold and hot flue gas.The numerical simulation and model test results show that

in SCR system equipped with the uniform flow device for sharp bend flue

the temperature deviation of the catalyst flow decreases to 7 ℃.Moreover

the other technical indexes also meet the requirements.