Pulverized straw combustion in a low-NOx multifuel burner: Modeling the transition from coal to straw

Mandø, Matthias; Rosendahl, Lasse; Yin, Chungen; Sörensen, Henrik

doi:10.1016/j.fuel.2010.05.016

Cited by 55 publications

(29 citation statements)

References 43 publications

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“…The NO x emissions during co‐firing present a more complicated picture and reports indicate the potential for emissions both less and higher than those from dedicated coal combustion . Generally though, the case is that co‐firing reduces the level of NO x emissions over those of coal combustion because of the low fuel nitrogen content of many biomass types, especially wood, as well as because fuel nitrogen in biomass is mostly transformed to NH 3 , which has a lower conversion to NO compared to HCN, the main product of coal fuel nitrogen . In some cases, the NO x reduction in co‐firing has been reported as higher than the one theoretically calculated by the amount of total fuel nitrogen that enters the furnace …”

Section: Emissionsmentioning

confidence: 99%

“…The first one involves the utilization of torrefied biomass as a co‐firing fuel (route 5 in Figure ). Torrefaction is a thermochemical process conducted at 200–300°C and with a typical residence time of 1 h, during which biomass partially decomposes giving off volatiles and producing the remaining solid as a final product . The breakdown of the hemicellulose matrix during torrefaction leads to significant benefits, such as increases of energy density, lower energy consumption during grinding, development of hydrophobic properties, resistance to biological degradation, and more uniform fuel properties .…”

Section: Future Perspective Of Co‐firingmentioning

confidence: 99%

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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: 99%

Section: Future Perspective Of Co‐firingmentioning

confidence: 99%

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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“…The milling process is a necessary step in suspension firing [1]. Size reduction improves fuel conversion processes because of the creation of larger reactive surface areas [2,3]. Biomass is, due to its fibrous structure, difficult to mill.…”

Section: Introductionmentioning

confidence: 99%

One way of representing the size and shape of biomass particles in combustion modeling

Trubetskaya

Beckmann²,

Wadenbäck

et al. 2017

Fuel

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a b s t r a c tThis study aims to provide a geometrical description of biomass particles that can be used in combustion models. The particle size of wood and herbaceous biomass was compared using light microscope, 2D dynamic imaging, laser diffraction, sieve analysis and focused beam reflectance measurement. The results from light microscope and 2D dynamic imaging analysis were compared and it showed that the data on particle width, measured by these two techniques, were identical. Indeed, 2D dynamic imaging was found to be the most convenient particle characterization method, providing information on both the shape and the external surface area. Importantly, a way to quantify all three dimensions of biomass particles has been established. It was recommended to represent a biomass particle in combustion models as an infinite cylinder with the volume-to-surface ratio (V/A) measured using 2D dynamic imaging.

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“…From these results within the range of particle aspect ratio investigated, Yin et al proposed a simple function to replace the integral expression of the burning enhancement factor. Numerical and experimental investigations on biomass combustion indicated that it was important to take particle sphericity into account . The expressions of the burning enhancement factor were provided without fine theoretical analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical and experimental investigations on biomass combustion indicated that it was important to take particle sphericity into account. [10][11][12][13][14][15][16] The expressions of the burning enhancement factor were provided without fine theoretical analysis. Note that the diffusion equation of oxygen mass fraction was considered a differential equation, for which it is difficult to obtain an analytical solution.…”

mentioning

confidence: 99%

Char combustion of ellipsoidal particles in a hot gas with fluctuating temperature

Zhang

2016

Can J Chem Eng

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Char combustion of biomass particles is a significant thermo‐chemical conversion process. The char combustion process of biomass particles with gas temperature fluctuation is numerically investigated. Considering the non‐spherical shape of biomass particles, a fully algebraic expression of burning enhancement factor is theoretically derived to modify the char combustion rate of ellipsoidal particles. Four solid biofuel samples (cynara, pinewood, willow, and cardoon) are chosen for the calculations. The instantaneous mass variations and char combustion rates of biomass particles are calculated under different particle sphericities. Different kinetic parameters of biomass samples lead to various effects of gas temperature fluctuation on char combustion. The gas temperature fluctuation generally enhances the char combustion rate. Increasing the fluctuation frequency of gas temperature has no effect on char combustion. Under the same particle surface area, the char combustion rate is enhanced with decreasing particle sphericity.

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Pulverized straw combustion in a low-NOx multifuel burner: Modeling the transition from coal to straw

Cited by 55 publications

References 43 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

One way of representing the size and shape of biomass particles in combustion modeling

Char combustion of ellipsoidal particles in a hot gas with fluctuating temperature

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