Optimized Design of CFD-based Internal Flow Field of SCR Device
Selective catalytic reduction is the wide application technology for removing NOx.Its denitrification efficiency and ammonia escape rate are closely related to its internal flow characteristics.Installation baffles in the SCR device can effectively improve the flow field inside the curve,stable and efficient operation of the SCR device.Based on the computational fluid dynamics simulation method,an SCR coal-fired boiler system was simulated and three kinds baffle design schemes were proposed and numerically simulated simultaneously.The results demonstrated that AIG downstream velocity variance coefficient was 6.69,the catalyst upper layer cross-sectional velocity variance coefficient was 11.84,the average cross-sectional temperature was 499 K,and the maximum temperature deviation is 9 ℃ after the design optimization.The ultimate minimum temperature range spans were 15 ℃,the average cross-sectional NH3/NOx molar ratio was 0.812,the variance coefficient was 4.67,and the pressure loss was 1 855 Pa.This research will contribute to improve the denitration efficiency and provide a significant reference value for the actual transformation of the design.
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