Combustion behavior of low-rank coal impregnated with glycerol

Lee, Byoung-Hwa; Sh, Lkhagvadorj; Bae, Jong‐Soo; Choi, Young-Chan; Jeon, Chung-Hwan

doi:10.1016/j.biombioe.2016.02.028

Cited by 32 publications

(15 citation statements)

References 28 publications

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“…Figure 7 shows UBC emission after burning at 1000 • C for dried sewage sludges and HSF samples. UBC emission was calculated as [30]:…”

Section: Air Pollutants Emissions Of Hsfmentioning

confidence: 99%

“…Unfortunately, each method has its disadvantages and limitations. The energy efficiency of process decreases and the unburned carbon increases since the cofiring of simply blended fuels results in heterogeneous combustion behaviors of the combined fuels [30]. The HTC process is generally suited for wet sewage sludge with~80% moisture content [31].…”

Section: Introductionmentioning

confidence: 99%

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Two-in-One Fuel Synthetic Bioethanol-Lignin from Lignocellulose with Sewage Sludge and Its Air Pollutants Reduction Effects

et al. 2019

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Developing effective, economical, and environmentally sound approaches for sewage sludge management remains an important global issue. In this paper, we propose a bioethanol-lignin (nonfood biomass)-based sewage sludge upgrading process for enhancing the heating value and reducing air pollutants of hybrid sewage sludge fuel (HSF) for the effective management of sewage sludge. Sewage sludge paste with the lignin-CaO solution implies drying at 105 °C accompanied by torrefaction at 250 °C. During torrefaction, moisture and partly volatile matter begin to evaporate, and are almost vaporized out to the surface. In this study, the proposed process enhances the net caloric value (NCV) to 37%. The lignin-embedded HSF shows a two-in-one combustion peak regardless of the mixing ratio, resulting in a 70% reduction of unburned carbon (UBC) emissions, which is one of the particular matter (PM) sources of combustion flue gas. Other air pollutants, such as CO, hydrocarbon, NOx, and SOx, were also reduced by the proposed process. In particular, SOx emission remained at ~1 ppm (average value) regardless of the sulfur content of the fuel.

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“…Figure 7 shows UBC emission after burning at 1000 • C for dried sewage sludges and HSF samples. UBC emission was calculated as [30]:…”

Section: Air Pollutants Emissions Of Hsfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-in-One Fuel Synthetic Bioethanol-Lignin from Lignocellulose with Sewage Sludge and Its Air Pollutants Reduction Effects

et al. 2019

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“…The known works [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] are devoted to co-combustion of coal with all sorts of biological additives. As additives to coal fuels are used waste wood (sawdust, chips) [11,12], straw [13], vegetable oils (e. g. sunflower and olive oils) [14,15], olive cake [16,17], fruits stone [18], coconut shell [19], sunflower husk [20,21], rapeseed oil [22], glycerol [23], rice husk [24]. The processes of preparation, ignition, combustion, and formation of gaseous emissions and ash have been considered at cocombustion of coal and biomass (with varying mass fractions of each component of the mixture).…”

Section: --------------mentioning

confidence: 99%

“…The processes of preparation, ignition, combustion, and formation of gaseous emissions and ash have been considered at cocombustion of coal and biomass (with varying mass fractions of each component of the mixture). The vast majority of the results indicate a significant reduction in the amount of emissions due to the involvement of plant additives in the process of energy generation [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. However, much less works aim at studying the combustion processes of composite liquid fuels with an admixture of a vegetable component.…”

Section: --------------mentioning

confidence: 99%

Experimental researches of the effect of vegetable oil addition on the emissions during combustion of coal liquid fuels

Nyashina¹,

Стрижак²

2019

THERM SCI

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This paper presents the findings of research into combustion of vegetable oils in the composition of coal liquid fuel. The aim of the research was to study the influence of additives of typical vegetable oils (rapeseed, olive, coconut oil, etc.) on concentrations of anthropogenic emissions during combustion of coal water slurries based on coal processing waste. In order to study the effect of different parameters on the emissions efficiency, the tests were done in different operating conditions: muffle furnace temperature, share of oil (up to 15%) in the mixtures, and oil type. The differences between the concentrations of SOx and NOx in the combustion of typical filter cakes (waste coal), as well as those of suspensions with the addition of vegetable impurities have been investigated. It is shown that the concentrations of SOx can be reduced by 5-63% and those of NOxby 5-62% in comparison with coal liquid fuels based on oil refinery waste. Using the generalizing criterion, the paper illustrates the advantages of adding vegetable oils to enhance the prospects of slurry fuels (even based on coal processing waste) in comparison with coal that is the most dangerous in terms of environmental pollution.

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“…13 One of the promising organic additives for substitution of the water in coal-water fuel is glycerol, which is a by-product of some industries, and one of the main products in the production of biofuels. 14,15 It is predicted that global biodiesel production will reach about 39 billion liters by 2024, 16 and accordingly, there is a need for glycerol utilization. The calorific value of glycerol is 18.5 MJ/kg to 20.5 MJ/kg.…”

Section: Introductionmentioning

confidence: 99%

Evidence of the illegitimacy of the additive approach to the determination of the thermophysical properties of coal‐water fuel with glycerol

et al. 2020

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For the fuel ignition, the thermal conductivity and heat capacity are the key properties that determine the pre-ignition behavior of the drop of the fuel. The classic monophase fuels, such as natural gas, liquid propellants, or solid onecomponent fuels, have been investigated for a long time; and their thermophysical properties are well known in most of the cases. Composite fuels, which have recently attracted the attention of the researchers, have complex contents. In many cases, composite fuel is a mixture of solid and liquid components in the form of a slurry. Coal-water fuel and its derivatives with different additives are examples of such type fuels. For those fuels, the thermophysical properties are usually unknown. Nowadays, researchers use simple additivity theory for the calculation of the thermophysical properties of complex fuels for the first approach. Authors of this research believe that the simple additivity approach is not correct and can lead to the wrong results in the case of the numerical research of the ignition and burning processes of such a fuel. In the present research, the thermophysical properties of coalwater fuel with glycerol additives were experimentally obtained. It was found that the coefficient of thermal conductivity increases with temperature and varies in the range of 0.45 to 0.53 W/(mÁK). The heat capacity of the fuel also increases with the temperature and varies from 4.7 to 5.5 kJ/kgÁK. The higher the glycerol content, the lower the thermal conductivity and heat capacity of the composite fuel in the investigated temperature range. The results confirm the failure of the approach of the additivity law usage. Neither, thermal conductivity coefficient or heat capacity of the coal-water fuel with the addition of up to 20% glycerol complies with the additivity law. Differences between real values of the thermophysical properties and calculated ones are more than 30% No colors needed for a print copy of the manuscript.

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Combustion behavior of low-rank coal impregnated with glycerol

Cited by 32 publications

References 28 publications

Two-in-One Fuel Synthetic Bioethanol-Lignin from Lignocellulose with Sewage Sludge and Its Air Pollutants Reduction Effects

Two-in-One Fuel Synthetic Bioethanol-Lignin from Lignocellulose with Sewage Sludge and Its Air Pollutants Reduction Effects

Experimental researches of the effect of vegetable oil addition on the emissions during combustion of coal liquid fuels

Evidence of the illegitimacy of the additive approach to the determination of the thermophysical properties of coal‐water fuel with glycerol

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