Industrial Implications of the Properties of Brown Coals

Allardice, D.J.; Newell, Bob

doi:10.1016/b978-0-7506-0420-8.50017-8

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…The behavior of the cations listed in Table 3 in MTE-and HTD-product coals and associated waters have been previously investigated [2,6,7]. The overriding reason for their extensive study is that these components are generally the most abundant inorganic species in Latrobe Valley brown coals and can cause fouling of boilers during combustion; the associated energy (heat) transfer problems are also well documented [19]. One of the most common inorganic elements in Latrobe Valley brown coals is Na.…”

Section: Mte and Htd Treatmentmentioning

confidence: 97%

The Fate of Trace Elements During MTE and HTD Dewatering of Latrobe Valley Brown Coals

2007

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The nonevaporative brown coal dewatering technologies, Mechanical Thermal Expression (MTE) and Hydrothermal Dewatering (HTD), are being evaluated in an attempt to increase the efficiency of coal drying compared with current evaporative methods.Product waters from each of the three major Latrobe Valley mines were prepared under both MTE (200 C and 15 MPa mechanical pressure) and HTD (300 C and 12 MPa) conditions. Comparison of the relative abundance of individual inorganic components across the two processes generally reflected their form (dissolved, exchanged, or mineral) in the parent coals. For MTE the data were complicated by leaching of rig components (principally bronze). MTE-derived waters contained greater amounts of Ag, As, Cd, Cr, Cu, Hg, Mo, Ni, Sn, and Zn. HTD waters had greater amounts of Al, B, Ba, Ca, Fe, K, Mg, Mn, Na, Pb, Se, Sr, Tl, and V. Dissolved organic carbon was five times higher in the HTD products as a result of the higher processing temperature employed. Many species (Al, Ag, As, Cd, Cr, Cu, Hg, Mo, Ni, Pb, V, Se, and Zn) were found to be above acceptable guidelines for discharge to the environment.

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Section: Mte and Htd Treatmentmentioning

confidence: 97%

The Fate of Trace Elements During MTE and HTD Dewatering of Latrobe Valley Brown Coals

2007

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“…The ignitability indices of Melina and Teak woods are presented in Figure 6. The ignitability index is also an indication of the likely performance of torrefied biomass in the furnace/boiler conditions [37]. The ignitability indices of the torrefied biomass were better than those of raw samples and it increases with torrefaction temperature.…”

Section: Fuel Ratio and Ignitability Indexmentioning

confidence: 99%

The ignitability, fuel ratio and ash fusion temperatures of torrefied woody biomass

Adeleke

Odusote

Ikubanni

et al. 2020

Heliyon

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The impact of torrefaction temperature on the ignitability, fuel ratio and ash fusion temperatures of two tropical deciduous woods (Teak and Melina) were investigated in a setup of tubular furnace. The properties considered are calorific value, fuel ratio, ignitability index, ash compositions and ash fusion temperatures of the biomass. Six different temperatures (220, 240, 260, 280, 300 and 320 C) at 60 min reaction time were considered. The results indicated that as torrefaction temperature increased, the calorific value, fuel ratio and ignitability index of the biomass also increased. The ignitability index of biomass (40-63) was better than the value (35) recommended for fuel applicable in thermal plants for power generation. The ash compositional analysis revealed that there was no variation in the quantity of SiO 2 , Al 2 O 3 , CaO along with other minerals for the raw and torrefied biomass. This implied that the temperature up to 320 C has no significant impact on the compositions of biomass ash during torrefaction. The ash fusion temperature test showed that the biomass ash softens at % 1200 C and finally fused at % 1300 C. The study concluded that an increase in torrefaction temperature increases the thermal properties of the torrefied biomass without affecting the compositions of biomass ash or lowering the ash fusion temperatures.

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Industrial Implications of the Properties of Brown Coals

Cited by 2 publications

References 19 publications

The Fate of Trace Elements During MTE and HTD Dewatering of Latrobe Valley Brown Coals

The Fate of Trace Elements During MTE and HTD Dewatering of Latrobe Valley Brown Coals

The ignitability, fuel ratio and ash fusion temperatures of torrefied woody biomass

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