SCR Design and Application of Stainless Steel Pickling Roasting Flue Gas with Aspen Plus Simulation
The denitrification process of"GGH+burner+circulation+SCR"was adopted,and the material and heat balance was carried out in combination with Aspen Plus software,according to the characteristics of low temperature and ultra-high concentration NOx of flue gas from the mixed acid roasting.Firstly,the temperature rise of GGH cold flow is 120-155℃,and the circulation ratio of flue gas is 1.5-2.5 under the design working condition.Secondly,the natural gas is used for heat supplement in the condition of low working load,and the combustion air is used for cooling under high operating load.In addition,the inlet temperature of SCR is controlled at 260-280℃to ensure catalyst activity,and the outlet temperature of SCR is controlled below 430℃to avoid catalyst deactivation.Finally,a mixed acid roasting flue gas SCR project was designed and directed,and the expected effect was obtained.
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