Effect of coal blending and particle size on NOx emission and burnout

Maier, H.; Spliethoff, Hartmut; Kicherer, Andreas; Fingerle, A.; Hein, K. R. G.

doi:10.1016/0016-2361(94)90060-4

Cited by 78 publications

(30 citation statements)

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“…The HGIs of the binary coal blends were determined after mixing 0.60-1.18 mm size fractions in the proportions outlined above. 4 …”

Section: Sample Preparationmentioning

confidence: 99%

“…This, in turn, makes it very difficult to set the grindability specification of the coals to be blended. Utilities are, in addition, switching to low-NOx combustion technologies and need to obtain a balance between the conflicting requirements of minimum NOx emissions and acceptable unburnt carbon levels in the fly ash [4]. This dependence of unburnt carbon and NOx emissions could potentially be minimised by grinding the coal finer which in turn will be dependant upon the method of comminution.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the grinding behaviour of coal blends on coal utilisation for combustion

et al. 1999

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Grinding of a high volatile bituminous coal was performed in three comminution devices:Raymond Mill, Rolls Crusher and Ball Mill. The pulverised samples were sieved to obtain four particle size fractions and temperature-programmed combustion (TPC) was used for the evaluation of their combustion behaviour. In addition, three coals of different hardness and rank were mixed in various proportions in order to compare the combustibility characteristics of the binary coal blends with those of the individual coals. The effect of coal blending on grindability was also studied. It was found that grindability was non-additive especially when coals of very different Hardgrove Grindability Index (HGI) were blended. The combustion studies also suggested that there exist interaction between individual coals when they are burnt as a blend. RésuméUn charbon bitumineux contenant un taux élevé de matières volatiles a été broyé au moyen de trois types de broyeurs: un broyeur Raymond, un broyeur à rouleaux et un broyeur à boules. Les échantillons pulvérisés ont été tamisés pour obtenir quatre fractions de différent diamètres de particules et des essais de combustion à température contrôlée (TPC) ont été réalisés pour évaluer leur comportement pendant le processus de combustion. En outre, trois charbons de dureté et rang différents ont été mélangés en proportions variées, afin de comparer les caractéristiques de combustion des mélanges binaires à celles des charbons individuels. L'effet du mélange des charbons sur la capacité de mouture a été également étudié. On a trouvé que cette capacité n'est pas additive, surtout quand des charbons ayant des Indices Hardgrove (HGI) très différents sont mélangés. Les études de combustion montrent 2 aussi qu'il existe une intéraction entre les charbons individuels quand ils sont brûlés en tant que mélange.

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“…The HGIs of the binary coal blends were determined after mixing 0.60-1.18 mm size fractions in the proportions outlined above. 4 …”

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the grinding behaviour of coal blends on coal utilisation for combustion

et al. 1999

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“…One of the effective ways to decrease the emission of NO x is to raise the PF concentration and delay the mixing of air with the coal stream. However, this is prone to form slag in the furnace and often has an unfavourable effect on the combustion efficiency (Rees et al, 1981;Asay et al, 1983;Schnell et al, 1993;Smart and Morgan, 1994;Abbas et al, 1994;Maier et al, 1994;Kicherer et al, 1994;Black et al, 1998;Visona et al, 1999). To solve the problems of flame stability in burning low-volatile pulverized coals in China, the bluff-body burners have been successfully used (Shi et al, 1996;Ma et al, 2001).…”

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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“…As verified by other researchers, the authors found NOX emissions increase with temperature and with increased air. German utilities (Maier et al 1994) have reduced NOX emissions by a factor of two (-400 ppm to -200 ppm at 6% 02) by using rebuming.…”

Section: No + Chs " + Hcn+ H20mentioning

confidence: 99%

NOx EMISSIONS PRODUCED WITH COMBUSTION OF POWDER RIVER BASIN COAL IN A UTILITY BOILER

Nordin¹,

Merriam²

1997

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Effect of coal blending and particle size on NOx emission and burnout

Cited by 78 publications

References 0 publications

Effect of the grinding behaviour of coal blends on coal utilisation for combustion

Effect of the grinding behaviour of coal blends on coal utilisation for combustion

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

NOx EMISSIONS PRODUCED WITH COMBUSTION OF POWDER RIVER BASIN COAL IN A UTILITY BOILER

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