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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Печать: 0276-1459
ISSN Онлайн: 1943-6181

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Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.2020031345
pages 155-172

ENHANCING PERFORMANCE OF SELECTIVE CATALYTIC REDUCTION (SCR) SYSTEM BY COMBINING AMMONIA DIRECT INJECTION SYSTEM (ADIS) AND THE ISOSWIRLTM MIXER

Ali Tabikh
GE Power Sweden AB, Kvarnvägen, 351 12 Växjö, Sweden
Luca Spagnolo
GE Power Italy, via Gioia 26, Milano, 20124, Italy
Jingchuan Zhou
GE Power Sweden AB, Kvarnvägen, 351 12 Växjö, Sweden
Nabil Rafidi
GE Power Sweden AB, Kvarnvägen, 351 12 Växjö, Sweden
Larry Czarnecki
10345 Saint Regence Lane, Knoxville, TN 37932, USA

Краткое описание

GE Power Sweden AB developed an advanced mixing technology to cope with the demand for increased mixing in air quality control system applications. The recent technology is patented and trademarked under the name of a patented swirling technology mixer and is now applied in different products. Lately, the demand for high removal efficiency of NOx and simplification of selective catalytic reduction (SCR) systems has resulted in the need to implement the patented swirling technology with an ammonia direct injection system (ADIS). The combination of the two systems can reduce the number of injection nozzles and take advantage of the mixing capacity to even out NOx and temperature stratifications from the boiler and improve the NH3 distribution injected in the liquid or gas phase from a traditional ammonia injection grid (AIG) or ADIS system. In this paper, we demonstrate the efficiency of the patented swirling technology system together with the ADIS system in coping with different SCR applications and boiler loads, NOx, and temperature profiles. The patented swirling technology is applied in either tail-end SCR or high-dust applications. The design of the patented swirling technology mixer and ADIS system is confirmed by using computational fluid dynamics with the Euler-Lagrange Multiphase modeling approach to ensure complete evaporation of liquid ammonia droplets after injection from two-media nozzles. It is critical to evaporate all ammonia liquid droplets before reaching the patented swirling technology mixer area and to confirm the capacity of the mixer in order to uniformly distribute the gas phase components, such as NH3 and NOx, and consequently minimize the NH3/NOx stoichiometric ratio variation. A full-scale implementation of this system in a 330 MW coal-fired boiler with a high-dust SCR system showed that the capacity of the patented swirling technology mixer fulfilled the performance criteria upstream of the SCR catalyst and achieved the requested NOx removal efficiency and low NH3 slip at different loads.

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