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Two approaches of chemistry downsizing for simulating Selective Non Catalytic Reduction DeNOx Process

Benjamin Farcy ; Abdallah Abou-Taouk (Institutionen för tillämpad mekanik, Strömningslära) ; Luc Vervisch ; Pascale Domingo ; Nicolas Perret
Fuel (0016-2361). 118, p. 291-299. (2014)
[Artikel, refereegranskad vetenskaplig]

The introduction of strongly non-linear chemistry effects in numerical simulation of flows in Selective Non Catalytic Reduction (SNCR) DeNOx is addressed. In these systems of large dimensions, NOx in flue gas is reduced by injecting either ammonia or urea as a reducing agent. First, an analysis is performed to seek out with detailed chemistry (207 elementary reactions, 33 species by Klippenstein et al. (2011) [8]) the importance of global parameters in the performance of NO removal, such as temperature and major species concentration levels. Then, this detailed reaction mechanism needs to be simplified for its subsequent introduction in flow simulations. In this paper, two different methods relying on automated optimization tools for reducing the cost of chemistry are discussed. The first one is based on the tabulation of the detailed chemical response from canonical problems, using automatically defined progress variables. In the second one, a large sample set of detailed chemistry solution points is processed by an iterative optimization procedure, leading to a reduced two-step chemistry reproducing the response of the global parameters characterizing NO removal.

Nyckelord: Nitrous oxide, SNCR, Thermal DeNOx, Optimization, Chemistry Reduction


- Chemistry in Selective Non Catalytic Reduction (SNCR) DeNOx process is studied.
- Two automated methods are discussed for SNCR chemistry reduction.
- The sensitivity to temperature conditions in SNCR process is examined.
- Optimization tools are applied to chemistry downsizing for SNCR.
- Strategies for flow simulation in SNCR full geometries are examined.



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Denna post skapades 2013-10-31. Senast ändrad 2015-03-09.
CPL Pubid: 185939

 

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