Coal blend combustion: link between unburnt carbon in fly ashes and maceral composition

Helle, Sonia; Gordon, Alfredo L.; Alfaro, Guillermo; Garcı́a, Ximena; Ulloa, Claudia

doi:10.1016/s0378-3820(02)00245-x

Cited by 53 publications

(20 citation statements)

References 10 publications

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“…Total carbon is taken into consideration in the evaluation of LOI and, therefore, it might include inorganic carbon sources as well, such as carbonates. Since all the studied coals have a high percentage of ash, the unburned carbon in fly ash cannot be used to make comparisons among the combustion performances of these coals [21]. Thus, for comparative purposes, the unburned carbon can be used as an indicator of burnout performance.…”

Section: Resultsmentioning

confidence: 99%

Effects of coal properties on the production rate of combustion solid residue

Durgun¹,

Genç

2009

Energy

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Section: Resultsmentioning

confidence: 99%

Effects of coal properties on the production rate of combustion solid residue

Durgun¹,

Genç

2009

Energy

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“…-coal rank [31][32][33] -maceral composition of coal [8,17,18,31,[34][35][36][37][38][39] -volatile matter content [26,40] -moisture content in coal [10,41] -particle-size effect [9,10,16,26,[42][43][44] -coal char properties (porosity, fragmentation, specific surface area, etc.) [8,26,45] -effect of coal mineral matter [8,16,26,46] -coal blending [32,39,44,[47][48][49] -co-combustion of coal with alternative fuels [50][51][52][53][54].…”

Section: Effect Of Coal Characteristicsmentioning

confidence: 99%

Unburned carbon from coal combustion ash: An overview

Bartoňová

2015

Fuel Processing Technology

144

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“…It is also evident that under atmospheric conditions that the bubble rupture and pore structure is much larger than under 30bar pressure. The predictive caking model developed under 30bar pressure included 3 parameters, the maceral index [12], volatile matter divided by inherent moisture (pore resistance number), and the carbon content. This model has an R 2 value of 87%, which is an acceptable model considering that 87% of the experimental data is incorporated into the model.…”

Section: Discussionmentioning

confidence: 99%

Effect of Pressure on the Caking Propensity of Waterberg Coal

2017

Nov. 27-28, 2017 South Africa ASETWM-17, RCABES-17 &Amp; EBHSSS-17

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Abstract-In this study the high-pressure caking behavior of large Waterberg coal particles (4, 8, 10 and 20mm) was investigated. This coal was density separated into the following fractions: FL1.3, FL1.5, FL1.7, FL 1.9 and SI 1.9. Small samples (10-20g) of the 4,8,10 and 20mm density separated lump coal were reacted in a high-pressure reactor at 4 different pressures (Atm, 7.5, 15, and 30bar) at fixed temperatures of 450°C and 550°C. A 7°C per minute heating rate was employed during all experiments, which was executed in an inert nitrogen atmosphere. The degree of caking was determined on a mass% basis. X-ray computed tomography scans were conducted on the high caking density fraction FL1.3 and parent coal. Conventional coal characterization (proximate and ultimate) and petrographic analysis before and after devolatilization of the 10mm density separated coal fraction was also conducted. Finally, a predictive caking model was developed based on the coal properties. The caking propensity was found to be higher under 30bar pressure than at atmospheric conditions (0.87bar) for the 10mm particles, subjected to density cuts (FL1.5 and FL1.7) and the parent coal. The FL1.3, FL1.9 and SI1.9 fractions reported the same caking propensities under both 30bar and atmospheric pressures. On the other hand, the 4 and 8mm particles reported higher caking propensities at 550°C than for 450°C at 0.87 and 30bar pressure respectively. The 20mm particles reported slightly higher caking propensities (5 % ) than for the 10mm particles at 30bar and 550°C. It was also found that the caking propensity reaches a maximum at 15bar pressure for the 10mm particles. It is concluded that as the coal fractional density increases the caking propensity decreases. From the x-ray micro focus tomography results it is clear that the porosity of the caked particles decreases and the coalescence of the particles increase as the pressure increases. From characterization analysis it was found that the lighter density cuts contain more volatile matter, a higher CV value, lower ash content and higher vitrinite maceral composition, leading to higher caking propensity.

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Coal blend combustion: link between unburnt carbon in fly ashes and maceral composition

Cited by 53 publications

References 10 publications

Effects of coal properties on the production rate of combustion solid residue

Effects of coal properties on the production rate of combustion solid residue

Unburned carbon from coal combustion ash: An overview

Effect of Pressure on the Caking Propensity of Waterberg Coal

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