Bench-scale study of interactions between flue gas and cofired ash in an SCR

Strege, Joshua R.; Zygarlicke, Christopher J.; Folkedahl, Bruce C.; McCollor, Donald P.

doi:10.1016/j.fuel.2006.05.013

Cited by 11 publications

(7 citation statements)

References 9 publications

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“…As a result, a major concern in co‐firing applications is that the capture efficiency of the biomass ash particles will be lower than that of the coal particles, whereas the emissions level of submicron particles will increase. This has been confirmed by the operational experience of a number of plants, which report a slight increase in particulate emissions when co‐firing with wood . In some cases, the effectiveness of the flue gas treatment systems, including the electrostatic precipitators (ESPs), might be affected owing to the increase in flue gas volume during co‐firing.…”

Section: Emissionsmentioning

confidence: 74%

Co‐firing of biomass with coal in thermal power plants: technology schemes, impacts, and future perspectives

Karampinis

Grammelis

Agraniotis

et al. 2013

WIREs Energy & Environment

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Biomass co-firing is widely considered as the most cost-efficient and easily deployed way for mitigating the CO 2 emissions from the coal power sector. Apart from policy and market benefits and bottlenecks, the implementation of cofiring in a coal-fired power plant is affected by several technical and environmental concerns. A number of technical solutions have been developed and demonstrated for co-firing schemes, from the most common, direct co-firing scheme to the more sophisticated parallel and indirect co-firing systems. The impacts of co-firing relate mostly to the biomass fuel and ash properties and affect the fuel handling system, fuel conversion, slagging/fouling and corrosion, emissions, and ash utilization. Current operating experience and available solutions indicate that most technical concerns do not materialize or can be easily solved when co-firing woody biomass at relatively low thermal shares. As the biomass thermal share increases and more problematic fuels are utilized, further research and demonstration activities will be needed to evaluate potential impacts of co-firing.

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Section: Emissionsmentioning

confidence: 74%

Co‐firing of biomass with coal in thermal power plants: technology schemes, impacts, and future perspectives

Karampinis

Grammelis

Agraniotis

et al. 2013

WIREs Energy & Environment

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“…However, the deactivation on a commercial installation was lower than in case of the laboratory studies. Bench-scale deactivation studies of Strege et al [9] carried out for a commercial catalyst and co-firing of 80% biomass and 20% coal revealed that the loss of activity was approximately inverse with time. Possibly, the size of ash particles is responsible for that, as suggested by Kling et al [10] who reported that mainly alkali in ultra-fine particles, smaller than 100 nm, led to increased alkali accumulation.…”

Section: Atomic Absorption Spectroscopymentioning

confidence: 97%

“…This is very important, as large industrial installations usually co-fire different types and amounts of biomass over longer periods, and Obernberger et al [5] showed that different kinds of biomass affect not only their thermal utilization but also flue gas cleaning. Of the very few articles that would be, at least partly, relevant for industrial conditions in a large power plant co-firing coal and biomass, the articles of Wieck-Hansen et al [8], Larsson [7], Strege et al [9] and Kling et al [10] should be mentioned.…”

Section: Introductionmentioning

confidence: 99%

“…Strege et al [9] mixed samples of ash collected from a full-scale utility boiler co-firing wood and waste with ground SCR catalyst and exposed the samples to simulated flue gas containing 14% CO 2 , 8% H 2 O, 4% O 2 , 400 ppm SO 2 and 100 ppm NH 3 at TGA equipment at 316, 371 and 427 8C. As the major mass gain, the alkali sulfate formation and the blocking of pores of the SCR catalyst was recognized.…”

Section: Introductionmentioning

confidence: 99%

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The influence of poisoning on the deactivation of DeNOx catalysts

Kiełtyka

Dias

Kubiczek³

et al. 2015

Comptes Rendus. Chimie

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“…In the coal-fired power plant, the SCR facility is usually installed between the boiler and the air preheater [13][14][15][16] and works with the dust-laden gas. The accumulation and the deposition of the ash particles, especially the large-sized particles, will increase the risk of catalyst deactivation [17,18].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations on Reducing Particle Accumulation for SCR-deNOx Facilities

2019

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Selective catalytic reduction (SCR) is widely used to remove nitrogen oxides (NOx) in the flue gas of coal-fired power plants. The accumulation of ash particles inside the SCR-deNOx facility will increase the risk of catalyst deactivation or even damage. This paper presents the numerical and experimental investigations on the particle dispersal approach for the SCR-deNOx facility of a 1000 MW coal-fired power plant. The accumulation of different-sized particles is evaluated based on computational fluid dynamics (CFD) simulations. To prevent particles from accumulation, an optimized triangular deflector is proposed and attempts are made to find out the optimal installing position of the deflector. For the π-type SCR-deNOx facilities, the particle accumulation predominantly occurred on one side of the catalysts’ entrance, which corresponds to the inner side of the wedge-shaped turning. It is indicated that particles larger than 8.8 × 10−2 mm are responsible for the significant accumulation. The triangular deflector is proved to be an effective way to reduce particle accumulation and is found most efficient when it is installed at the high-speed area of the vertical duct. Flow model test (FMT) is carried out to validate the dispersal effect for the particle with relatively large sizes and the optimal installing position of the triangular deflector.

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Bench-scale study of interactions between flue gas and cofired ash in an SCR

Cited by 11 publications

References 9 publications

Co‐firing of biomass with coal in thermal power plants: technology schemes, impacts, and future perspectives

Co‐firing of biomass with coal in thermal power plants: technology schemes, impacts, and future perspectives

The influence of poisoning on the deactivation of DeNOx catalysts

Numerical and Experimental Investigations on Reducing Particle Accumulation for SCR-deNOx Facilities

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