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KMID : 1024520130220111481
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Journal of the Environmental Sciences
2013 Volume.22 No. 11 p.1481 ~ p.1498
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Numerical Study on Optimization of the SCR Process Design in Horizontal HRSG for NOx Reduction
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Kim Kyeong-sook
Lee Kyeong-ok
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Abstract
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The SCR (selective catalytic reduction) system is highly-effective technique for NOx reduction from exhaust gases. In this
study, the effects of the direction and size of nozzle and the ammonia injection concentration on the performance of SCR
system are analyzed by using the computational fluid dynamics method. When the nozzle is arranged in zigzaged direction which is normal to exhausted gas flow, it is shown that the uniformity of gas flow and the NH3/NO molar ratio is improved remarkably. With the change of the ammonia injection concentration from 0.2 vol%(wet) to 1.0 vol%(wet), the uniformity of gas flow shows a good results. As the size of nozzle diameter changes from 6 mm to 12 mm, the uniformity of gas flow is maintained well. It is shown that the uniformity of the NH3/NO molar ratio becomes better with decreasing the ammonia injection concentration and the size of nozzle diameter.
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KEYWORD
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SCR, DeNOx, HRSG, AIG, CFD
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