The effect of particle size on NO formation in a large-scale pulverized coal-fired laboratory furnace: Measurements and modeling

Abbas, Tahir; Costen, P.; Lockwood, F.C.; Romo-Millares, C.A.

doi:10.1016/0010-2180(93)90112-g

Cited by 52 publications

(20 citation statements)

References 5 publications

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“…Since the oxidation reaction rate (R2) of XN is high in the oxygen-rich region, XN changes to NO x immediately. Therefore, the increasing point of NO x concentration is detected upstream to that of XN concentration (17) . Next, the low oxygen concentration region is formed in the fuel-rich region, and is generated by devolatilization and char surface reactions.…”

Section: No X Reaction Submodelmentioning

confidence: 99%

Validation of Coal Combustion Model by Using Experimental Data of Utility Boilers

Yamamoto

Taniguchi

Kobayashi

et al. 2005

JSME international journal. Ser. B, Fluids and thermal engineer

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Applicability of a coal combustion model was validated by comparing its predictions with experimental data of utility boilers. The coal combustion model had gasification and NO x reaction submodels and it was developed by using a small drop-tube-furnace (coal feed rate 0.6 kg/h). A turbulence combustion simulation program was developed by introducing the coal combustion model. The program was validated by comparing its predictions with 23 sets of experimental results which contained different plant, load and coal data. The temperature difference between simulated and experimental results was within 30• C at the furnace exit. The decreasing characteristic of coal burnout with increasing load was well predicted. The NO x emission difference between simulated and experimental results was less than 15%. The coal combustion model was judged applicable to utility boilers.

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Section: No X Reaction Submodelmentioning

confidence: 99%

Validation of Coal Combustion Model by Using Experimental Data of Utility Boilers

Yamamoto

Taniguchi

Kobayashi

et al. 2005

JSME international journal. Ser. B, Fluids and thermal engineer

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“…Fueyo et al [74], [75] applied the shadow method to an Eulerian-Eulerian model of coal combustion and tested the model with an analytical solution for a simple problem. Abbas et al [1] investigated the effect of particle size on NO formation in pulverised coal furnaces and found that small and large particles generated more NO emissions than mediun-sized particles. Liakos et al [135] employed the same approach for modelling pulverised coal combustion and found that particle size can aid in controlling the temperature inside the furnace.…”

Section: Sprays and Bubblesmentioning

confidence: 99%

Population balance modelling of polydispersed particles in reactive flows

Rigopoulos

2010

Progress in Energy and Combustion Science

135

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Polydispersed particles in reactive flows is a wide subject area encompassing a range of dispersed flows with particles, droplets or bubbles that are created, transported and possibly interact within a reactive flow environment -typical examples include soot formation, aerosols, precipitation and spray combustion. One way to treat such problems is to employ as a starting point the Newtonian equations of motion written in a Lagrangian framework for each individual particle and either solve them directly or derive probabilistic equations for the particle positions (in the case of turbulent flow). Another way is inherently statistical and begins by postulating a distribution of particles over the distributed properties, as well as space and time, the transport equation for this distribution being the core of this approach. This transport equation, usually referred to as population balance equation (PBE) or general dynamic equation (GDE), was initially developed and investigated mainly in the context of spatially homogeneous systems. In the recent years, a growth of research activity has seen this approach being applied to a variety of flow problems such as sooting flames and turbulent precipitation, but significant issues regarding its appropriate coupling with CFD pertain, especially in the case of turbulent flow. The objective of this review is to examine this body of research from a unified perspective, the potential and limits of the PBE approach to flow problems, its links with Lagrangian and multifluid approaches and the numerical methods employed for its solution. Particular emphasis is given to turbulent flows, where the extension of the PBE approach is met with challenging issues. Finally, applications including reactive precipitation, soot formation, nanoparticle synthesis, sprays, bubbles and coal burning are being reviewed from the PBE perspective. It is shown that popualtion balance methods have been applied to these fields in varying degrees of detail, and future prospects are discussed.

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“…There are many parameters which influence the NO x formation, such as stoichiometric ratio, coal composition, coal particle size, near burner region aerodynamics, etc. (Wendt et al, 1979;Chen et al, 1982;Song et al, 1982;Okarzaki et al, 1984;Hill et al, 1984;Midkiff et al, 1986;Smart et al, 1988;Barratt et al, 1989;Costa et al, 1990;Abbas et al, 1991;Chae et al, 1991;Abbas et al, 1993;Visona et al, 1996). When the emission of NO x decreases in the coal combustion, the coal burn-out often decreases.…”

Section: Introductionmentioning

confidence: 97%

Experimental study of the combustion efficiency and formation of NOx in an industrial pulverized coal combustor

Yang

Penghua

et al. 2004

Int. J. Energy Res.

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SUMMARYWith horizontal bias combustion burners, experiments have been carried out on a 670 t h À1 , corner-fired, pulverized-coal fired boiler burning bituminous coal. At 200 MWe load, the furnace excess O 2 remains stable. The different horizontal fuel biases are obtained by changing the tilt angle of all the Louvre enrichers' regulating blades. The tilt angles of the blades are 0, 15, 24, 328; the result is that the enriching ratios of the fuel-rich primary air increase from 2.2 to 2.6 at No. 2 corner, and from 1.2 to 4.2 at No. 3 corner. The gas temperature increases in the burner region. The application of the horizontal bias combustion burners results in a reduction in NO x formation from 545.7 mg Nm À3 (O 2 =6%) to 287.9 mg Nm À3, and a substantial reduction in carbon in ash content from 5.24 to 2.48%. The boiler operated stably at a load of 80 MWe without auxiliary fuel oil.

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The effect of particle size on NO formation in a large-scale pulverized coal-fired laboratory furnace: Measurements and modeling

Cited by 52 publications

References 5 publications

Validation of Coal Combustion Model by Using Experimental Data of Utility Boilers

Validation of Coal Combustion Model by Using Experimental Data of Utility Boilers

Population balance modelling of polydispersed particles in reactive flows

Experimental study of the combustion efficiency and formation of NOx in an industrial pulverized coal combustor

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