Analysis of Coupling Effect between the Height of SCR Rectifier Grid and the Catalyst Installation Height

doi:10.11930/j.issn.1004-9649.201807102

Abstract

Abstract: The uniform flow field and concentration field in the SCR reactor are essential to achieving high denitrification efficiency. In this paper, by taking the SCR denitration reactor of a 1 000 MW coal-fired unit as the research object, its structure is thoroughly studied. The optimal spacing and height of rectifying grille are then determined from digital simulation, and the coupling effect of the ratio of rectifying grille height to the installation height of the first catalyst layer (denoted as c) on the flow field and concentration field uniformity is further simulated and verified through a series of experiment. The results show that the grid spacing should not be too large or too small, which is recommended at around 0.2 m. When the value of c increases, the velocity deviation of the first layer catalyst will increase. When the value of c is greater than certain threshold, the velocity deviations will jump sharply at all different grid heights. Particularly with the grid height at 0.8 m, the distance between the rectifying grille and the first layer catalyst can be increased correspondingly, and the value of c can be relaxed to 0.8.

Key words: boiler, selective catalytic reduction (SCR), rectifying grille, installation height of the first catalyst layer, spacing of grids

CLC Number:

GAO Jianqiang, LIANG Shengying, WEI Riguang. Analysis of Coupling Effect between the Height of SCR Rectifier Grid and the Catalyst Installation Height[J]. Electric Power, 2019, 52(4): 144-150.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201807102

https://www.electricpower.com.cn/EN/Y2019/V52/I4/144

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