Numerical Simulation and Optimization of Flow Field in the SCR Denitrification System on a 600 MW Capacity Units

Gao, Yanhong; Liu, Qingcai; Bian, Lingtao

doi:10.1016/j.egypro.2011.12.944

Cited by 22 publications

(17 citation statements)

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“…The highest NOx reduction efficiency can be achieved for NH 3 /NOx molar ratio between 1.0 and 1.1. For a value of NH 3 /NOx higher than this, reduction efficiency remains constant but the ammonia slip strongly increases [31]. To start SCR reactions, ammonia must first be activated, which can occur either through Lewis-type interaction or over a Brønsted acidic site, of which the second mechanism is more favorable [32].…”

Section: Catalyst Performancementioning

confidence: 99%

“…Some authors refer to the catalyst storage capacity as the total amount of NH 3 that can be adsorbed on the catalyst surface [37,38]. Another factor, important from the DeNOx reaction point of view, is a proper contact time between flue gas and the catalyst surface, therefore, too high a flue gas velocity can result in decreased NOx removal efficiency [31].…”

Section: Catalyst Performancementioning

confidence: 99%

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Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

et al. 2020

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Nitrogen dioxide is one of the most dangerous air pollutants, because its high concentration in air can be directly harmful to human health. It is also responsible for photochemical smog and acid rains. One of the most commonly used techniques to tackle this problem in large combustion plants is selective catalytic reduction (SCR). Commercial SCR installations are often equipped with a V2O5−WO3/TiO2 catalyst. In power plants which utilize a solid fuel boiler, catalysts are exposed to unfavorable conditions. In the paper, factors responsible for deactivation of such a catalyst are comprehensively reviewed where different types of deactivation mechanism, like mechanical, chemical or thermal mechanisms, are separately described. The paper presents the impact of sulfur trioxide and ammonia slip on the catalyst deactivation as well as the problem of ammonium bisulfate formation. The latter is one of the crucial factors influencing the loss of catalytic activity. The majority of issues with fast catalyst deactivation occur when the catalyst work in off-design conditions, in particular in too high or too low temperatures.

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Section: Catalyst Performancementioning

confidence: 99%

Section: Catalyst Performancementioning

confidence: 99%

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

et al. 2020

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“…The gaseous ammonia and the air delivered by the dilution fan are fully mixed in the ammonia gas/air mixer, and the mixed gas is sent to the ammonia injection busbar in front of the catalyst reactor through the ammonia supply pipe, and is finally evenly distributed into the flue in front of the reactor by the ammonia injection grill (AIG). The ammonia gas injected into the flue enters the SCR denitrification reactor vertically from the top to the bottom with the flue gas flow and completes the SCR reaction process with the catalyst at the temperature of 280℃-400℃, and the NOx in the flue gas is catalytically degraded into harmless N2 and H2O [18,19]. The injection amount of ammonia is controlled based on the NOx and O2 concentrations at the inlet and outlet of the SCR system, the measured values of the flue gas temperature, the flow of the dilution fan, and the flue gas flow.…”

Section: Scr Denitrification Systemmentioning

confidence: 99%

Analysis and Treatment Measures of Continuous Emission Monitoring System Fouling in a Coal-Fired Power Plant after Ultra-Low Emission Transformation

Zhang¹,

Zhu²,

Shen³

et al. 2020

Rev. Chim.

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Scanning electron microscopy (SEM) micro-morphology analysis, X-ray diffraction (XRD) and energy-dispersive X-ray diffraction (EDX) component analysis were conducted on the fouling of continuous emission monitoring system (CEMS) sampling tube at the outlet of limestone-gypsum wet flue gas desulfurization (WFGD) of unit 1 in a 600 MW supercritical coal-fired power plant in Inner Mongolia Autonomous Region. The results show that the main component of fouling was ammonium dihydrogen phosphate, which was generated by the reaction between phosphoric acid in the phosphoric acid titration device and the NH3 escaping from the selective catalyst reduction (SCR) denitrification system, and corresponding treatment measures were taken. It indicates that the average value of ammonia escape was reduced from 1.79 ppm to 1.54 ppm through the ammonia injection optimization test of the SCR denitrification system (at the load of 410 MW of the unit), which effectively reduced the generation of fouling. This research provides reference for improving the reliability of coal-fired unit operation after ultra-low emission transformation.

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“…Most SCR installations today employ some type of static mixer to achieve good NH 3 /nitric oxide (NO) mixing (Cichanowicz et al, 2006). Static mixer was mentioned in SCR system in Sun et al (2008), Yang et al (2012), Liu (2011), Sui and Yuan (2008), Guo et al (2010), Gao et al (2012b), Lei and Jin (2009), Xu et al (2007), and Yu et al (2010). The configuration of static mixer was developed and simulated (Jin et al, 2011).…”

Section: Research On Ammonia Concentrationmentioning

confidence: 99%

Research and proposal on selective catalytic reduction reactor optimization for industrial boiler

Yang

2018

Journal of the Air & Waste Management Association

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Flow filed distribution, gas incident angle, and temperature distribution are subjected to SCR reactor shape to a great extent, and reactor 2 proposed in this paper was of outstanding performance; ammonia concentration distribution is subjected to ammonia injection grid (AIG) shape, and AIG 3 could meet the technical indicator of ammonia concentration without mounting ammonia mixer. The developments above on the reactor and the AIG are both of great application value and social efficiency.

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Numerical Simulation and Optimization of Flow Field in the SCR Denitrification System on a 600 MW Capacity Units

Cited by 22 publications

References 0 publications

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

Analysis and Treatment Measures of Continuous Emission Monitoring System Fouling in a Coal-Fired Power Plant after Ultra-Low Emission Transformation

Research and proposal on selective catalytic reduction reactor optimization for industrial boiler

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