Effect of biomass blending on coal ignition and burnout during oxy-fuel combustion

Arias, B.; Pevida, C.; Rubiera, F.; Pís, J.J.

doi:10.1016/j.fuel.2008.01.020

Cited by 152 publications

(78 citation statements)

References 25 publications

(16 reference statements)

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“…Any improvement in the burnout of the less reactive component will depend on the oxygen and temperature profiles in the reactor [11]. In this work, olive waste, OW, was more reactive than coals HVN and SAB and so the burnout of the blends was improved.…”

Section: Burnoutmentioning

confidence: 87%

“…Arias et al [11] observed a substantial reduction in the ignition temperature of coal/biomass blends in air but only a small decrease under oxy-fuel combustion atmospheres. They explained this because biomass has a lower heating value than coal, and so less heat is generated during its oxidation in the ignition process, and CO 2 has a specific heat higher than N 2 .…”

Section: Ignition Temperaturementioning

confidence: 99%

“…According to Zhang et al [18], the specific heat capacity of the diluent gas is one of the principal factors affecting char surface temperature for any given fraction of O 2 . Therefore, particle temperature in a 21%O 2 -79%CO 2 atmosphere can be expected to be lower, which will cause the combustion rate of the char and the fuel burnout value to fall [11]. In addition, Li et al [19] attributed the different coal combustion behaviours under both atmospheres in a drop tube furnace to the lower diffusivity of O 2 in CO 2 than in N 2 , impeding the transport of O 2 to the surface of the particles and reducing the combustion rate of the volatile matter and char in oxy-fuel conditions.…”

Section: Burnoutmentioning

confidence: 99%

“…The combination of oxy-fuel combustion with biomass could afford a method of disposal for CO 2 that has only partially been studied. Preliminary works have been carried out employing thermogravimetric analysis [8,10] and an entrained flow reactor [11] with the aim of studying the cofiring of coal and biomass under oxy-fuel conditions, but more research is required in order to introduce this practice at industrial scale.…”

Section: Introductionmentioning

confidence: 99%

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Oxy-fuel combustion of coal and biomass blends

Riaza

Gil

Álvarez

et al. 2012

Energy

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153

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The ignition temperature, burnout and NO emissions of blends of a semi-anthracite and a high-volatile bituminous coal with 10 and 20 wt.% of olive waste were studied under oxy-fuel combustion conditions in an entrained flow reactor (EFR). The results obtained under several oxy-fuel atmospheres (21%O 2 -79%CO 2 , 30%O 2 -70% CO 2 and 35%O 2 -65%CO 2 ) were compared with those attained in air. The results indicated that replacing N 2 by CO 2 in the combustion atmosphere with 21% of O 2 caused an increase in the temperature of ignition and a decrease in the burnout value. When the O 2 concentration was increased to 30 and 35%, the temperature of ignition was lower and the burnout value was higher than in air conditions. A significant reduction in ignition temperature and a slight increase in the burnout value was observed after the addition of biomass, this trend becoming more noticeable as the biomass concentration was increased. The emissions of NO during oxy-fuel combustion were lower than under air-firing. However, they remained similar under all the oxy-fuel atmospheres with increasing O 2 concentrations. Emissions of NO were significantly reduced by the addition of biomass to the bituminous coal, although this effect was less noticeable in the case of the semianthracite.

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Section: Burnoutmentioning

confidence: 87%

Section: Ignition Temperaturementioning

confidence: 99%

Section: Burnoutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxy-fuel combustion of coal and biomass blends

Riaza

Gil

Álvarez

et al. 2012

Energy

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153

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“…Lai et al [20] compared the combustion behaviour of lignocellulosic materials in CO 2 /O 2 and N 2 /O 2 atmospheres and calculated the kinetic parameters considering three parallel reactions during the combustion. A few studies have been published on the oxy-fuel combustion of coal and biomass blends [21][22][23], but reactivity and kinetic studies of biomass and coal/biomass blends under oxy-fuel combustion needs to be carried out.…”

Section: Introductionmentioning

confidence: 99%

Kinetic models for the oxy-fuel combustion of coal and coal/biomass blend chars obtained in N2 and CO2 atmospheres

Gil

Riaza

Álvarez

et al. 2012

Energy

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The thermal reactivity and kinetics of five coal chars, a biomass char, and two coal/biomass char blends in an oxy-fuel combustion atmosphere (30%O 2 -70%CO 2 )were studied using the non-isothermal thermogravimetric method at three heating rates.Fuel chars were obtained by devolatilization in an entrained flow reactor at 1273 K under N 2 and CO 2 atmospheres.Three nth-order representative gas-solid models -the volumetric model (VM), the grain model (GM) and the random pore model (RPM) -were employed to describe the reactive behaviour of the chars. The RPM model was found to be the best for describing the reactivity of the high rank coal chars, while VM was the model that best described the reactivity of the bituminous coal chars, the biomass char and the coal-biomass blend char. The kinetic parameters of the chars obtained in N 2 and CO 2 in an oxy-fuel combustion atmosphere with 30% of oxygen were compared, but no relevant differences were observed. The behaviour of the blend of the bituminous coal (90%wt.) and the biomass (10%wt.) chars resembled that of the individual coal concealing the effect of the biomass. Likewise, no interaction was detected between the high rank coal and the biomass chars during oxy-fuel combustion of the blend.

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Biofuels from oilseed fruits using different thermochemical processes: opportunities and challenges

Cruz

Silva

et al. 2020

Biofuels Bioprod Bioref

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The characterization of the physical-chemical properties and the thermal behavior of oilseed fruits for biofuels production has gained interest in the scientific community and society more generally, in particular with regard to their use as partial replacements for fossil fuels and for the possible reduction of air pollutants that cause problems for human health, animals, and plants. These oilseed fruits, which are rich in lipids, triglycerides, fatty acids, carotenoids, and other greasy compounds, can be transformed into solid, liquid, and gaseous products by different thermochemical conversion processes (conventional combustion, pyrolysis, oxy-fuel combustion, gasification and transesterification). This review investigates the different oleaginous feedstocks commonly found in the forests and plantations of Brazil -for example, olive stones, palm fruits, babassu coconut, macauba fruits, tucumã seeds and soybeans, and the respective residues generated from biofuel production and manufacturing processes. The main opportunities and challenges associated with the use of biofuels produced from these oilseed fruits lie in the fact that internal combustion engines using fossil fuels do not need to undergo modifications and mechanical adaptations to operate, and there is no corrosion risk and / or deterioration of metallic parts. Biofuels produce less greenhouse gas, or their pollution is considered neutral. Finally, the native forests of Brazil and the world present a vast number of different oleaginous species that still need be studied because they have excellent potential to be used as biofuels, as they are renewable energy sources and are sustainably eco-friendly.

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Effect of biomass blending on coal ignition and burnout during oxy-fuel combustion

Cited by 152 publications

References 25 publications

Oxy-fuel combustion of coal and biomass blends

Oxy-fuel combustion of coal and biomass blends

Kinetic models for the oxy-fuel combustion of coal and coal/biomass blend chars obtained in N2 and CO2 atmospheres

Biofuels from oilseed fruits using different thermochemical processes: opportunities and challenges

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