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SCR Ammonia Distribution

Ammonia distribution through SCR catalysts is critical to SCR NOx removal efficiency. 

RAS has applied CFD to design and optimize ammonia injection systems to maximize the ammonia distribution and velocity distribution through catalyst. The injection systems and devices include ammonia injection lances, baffle plates, perforated plates and/or injection grids. While maximizing and velocity distribution, the pressure drop across these devices need to be minimized. All these performance criteria can be evaluated in the CFD.

CFD used to design ammonia distribution in SCR reactor

CFD predicted vertical velocity and ammonia distribution above catalyst. Baffles and mixers in the upstream duct are used to maximize these distribution. 

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