Briquetting of Coal Fines and Sawdust Part I: Binder and Briquetting-Parameters Evaluations

Taulbee, Darrell N.; Patil, D. P.; Honaker, R.Q.; Parekh, B.K.

doi:10.1080/19392690802628705

Cited by 56 publications

(36 citation statements)

References 2 publications

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“…When wood residue briquettes were combusted, HHV = 32.5 MJ kg -1 (Sotannde et al, 2010). Our results are a slightly lower, compared to the HHV of coal briquettes, being from 24.5 to 33.8 MJ kg -1 (Taulbee et al, 2009). We found the content of volatiles to be within the range 25-30%, while the share of ashes from burning of either T1 or T2 briquettes constituted 5-10%.…”

Section: Resultscontrasting

confidence: 39%

“…Further technical and economic aspects of fine coal and charcoal briquettes have been evaluated because of the binder and briquetting parameters. Briquetting pressure and dwell time have a weak impact, while binder type and curing conditions exert the greatest influence on briquettes quality (Borowski and Hycnar, 2013;Taulbee et al, 2009). What is more, mechanical properties increase with time of curing at room temperature of carbonized-coal briquettes (Blesa et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Effect of starch binder on charcoal briquette properties

Borowski¹,

Stępniewski²,

Wójcik-Oliveira³

2017

International Agrophysics

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A b s t r a c t. The paper shows the results of a study on the effect of starch binder on the mechanical, physical and burning properties of charcoal briquettes. Two types of binders were repeatedly used to make briquettes of native wheat starch and modified wheat starch, at 8% of the whole. Briquetting was performed in a roller press unit, and pillow-shaped briquettes were made. The moisture of the mixed material ranged from 28 to 32%. The product, whether the former or the latter, was characterized by very good mechanical properties and satisfactory physical properties. Moreover, the type of starch binder had no effect on toughness, calorific heating value, volatiles, fixed carbon content and ash content. However, the combustion test showed quite different burning properties. As briquettes should have short firing up time and lower smokiness, as well as high maximum temperature and long burning time, we have concluded that briquettes with native wheat starch as a binder are more appropriate for burning in the grill.K e y w o r d s: charcoal briquette, starch binder, burning INTRODUCTIONCharcoal fuel has many attractive features: it contains almost no sulfur or mercury and is low in nitrogen and ash, in addition, it is easy to store and handle (Antal and Grønli, 2003). Further technical and economic aspects of fine coal and charcoal briquettes have been evaluated because of the binder and briquetting parameters. Briquetting pressure and dwell time have a weak impact, while binder type and curing conditions exert the greatest influence on briquettes quality (Borowski and Hycnar, 2013;Taulbee et al., 2009). What is more, mechanical properties increase with time of curing at room temperature of carbonized-coal briquettes (Blesa et al., 2003).Binders such as molasses, starch, tar, etc. are added to produce fuel briquettes, and the addition of starch binder, as well as gum Arabic binder improves the caloric value of biofuel briquettes (Zakari et al., 2013). Physical properties such as density, compressive strength and impact resistance index of briquettes also show significant improvement because of binders (Sen et al., 2016). Further additives are inorganic fillers which delay the heat release of the burning briquette, and ignition enhancers, which promote greater combustibility. Charcoal briquettes are promoted as substitutes for natural coal, petroleum coke or lignite. Still, the advantages of charcoal fuel depend on important factors: low sulphur content, high carbon to ash ratio, relatively few and nonreactive inorganic impurities, specific pore structure with large surface area, good reduction ability, almost smokeless emissions (Emrich, 1985). The disadvantages of charcoal fuel are clearly seen when compared to liquefied petroleum gas (LPG) fuel. The charcoal grilling footprint of CO 2 is almost three times larger than for LPG combustion. In addition, LPG is radically more efficient than charcoal in its production, and considerably more efficient in cooking. However, the use of LPG requires a heavier and more...

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Section: Resultscontrasting

confidence: 39%

Section: Introductionmentioning

confidence: 99%

Effect of starch binder on charcoal briquette properties

Borowski¹,

Stępniewski²,

Wójcik-Oliveira³

2017

International Agrophysics

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“…The biomass particle size is inversely proportional to the density which results from larger contact area effects in smaller particles and better density [3][4][5][6]. Such particles in the conditioning process more easily absorb the steam and thus cause greater influence of gelatinize the starch and increase the productivity and reduce the cost and improve the agglomeration stability of the pellets.…”

Section: Resultsmentioning

confidence: 99%

“…Particles of smaller size have a greater contact area and are easier to package during compaction [1][2][3][4][5][6]. Higher surface area increases number of contact points for chemical reactions [7], which may require grinding to a nominal particle size of about 1 mm.…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Shredded Straw and Hay Biomass: Part 2—The Finest Particles

Lisowski

Kostrubiec

Dąbrowska

et al. 2016

Waste Biomass Valor

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The aim of this study was to determine the characteristics of fine shredded pan fraction of biomass from sieve analyzer of oscillatory motion and as significance it was comparison the geometric mean particle size calculated according to the S319.4 standard with the arithmetic mean particle size that is assumed as half size of the last sieve 1.65 mm, according to the S424.1 standard. It was found that the finest particles size distributions are less varied between types of biomass (straw, hay and their mix) and are more aligned than particle size distributions for whole mixtures. The particles of hay were more uniform and belonged to ''well sorted'' category than particles of straw and mix, which were non-uniform and belonged to ''moderately well sorted'' category. All biomass particles size belonged to ''very well sorted'' category and particle size distribution were ''very fine skewed'' and ''mesokurtic''. The geometric mean of the finest fraction particle size is almost by half smaller than the value resulting from the half value of the last sieve hole size (1.65 mm) of sieve separator with oscillatory motion in the horizontal plane, as these values are 0.45 and 0.82 mm, respectively. Assuming the 0.1 mm for a pan and the last sieve size of 1.65 mm we suggest to calculate the geometric mean (0.41 mm), which is closer to the experimental value. Application of this recommendation to the standard requires further comparative studies.

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“…The approaches toward the pretreatment [4][5][6][7] of low rank coal have been very diverse, but the commonly used pretreatment method is thermal treatment. Zeng et al [8] investigated the effects of thermal pretreatment in helium on the pyrolysis behavior of Loy Yang brown coal and found that preheating the brown coal at N523 K leads to reduced tar and increased char yields.…”

Section: Introductionmentioning

confidence: 99%