Bioliquids and their use in power generation – A technology review

Seljak, Tine; Buffi, Marco; Valera‐Medina, Agustin; Chong, Cheng Tung; Chiaramonti, David

doi:10.1016/j.rser.2020.109930

Cited by 41 publications

(17 citation statements)

References 103 publications

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“…For this purpose, the probability of the measured temporal pressure signal is analyzed in this subsection. Figure 6 shows the histogram of the pressure signal of 2 14 datapoints of D combustion at the observed three flame shapes and right before the blowout, corresponding to Cases 2-5. Note that the latter state was also characterized by a V-shaped flame.…”

Section: Spectral Analysis Of Diesel Oil Combustionmentioning

confidence: 99%

“…Most renewable fuels are oxygenated by their nature [9], which is favorable from the pollutant emission point of view in internal combustion engines [10]. The renewable fuels can be light (LRF), such as alcohols [11,12] or heavy (HRF), like animal fat [13], pyrolysis oil and straight vegetable oils [14,15]. Representatives of the former category are significantly easier to utilize; the currently available technologies are capable of handling them.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Comparison of Diesel and Crude Rapeseed Oil Combustion in a Swirl Burner

Józsa

2020

Applied Sciences

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In pursuing maximum energy efficiency, local utilization of various crude fuels came into view. The present paper compares the combustion characteristics of standard diesel oil and crude rapeseed oil; the latter is an excellent model for high-viscosity liquid fuels. The combustion tests were performed in a 15 kW atmospheric turbulent swirl burner; the liquid fuels were atomized by a plain-jet airblast atomizer. Firstly, the acoustic signal is evaluated, since the instabilities of swirl combustion are accompanied by characteristic pressure fluctuations. The spectral analysis was performed by Wavelet transform, which fits excellently to the acoustic spectrum of combustion noise. This multi-scale technique features increased spectral resolution at lower frequencies at the expense of lower temporal resolution, providing excellent performance at both low-frequency, well-localized components and high-frequency, broadband phenomena. The joint probability density function of two characteristic frequencies was plotted with the result that flame acoustics match for the two fuels. Secondly, their pollutant emissions were compared and evaluated under similar conditions with the conclusion that crude rapeseed oil can substitute diesel oil in a limited operating range. Note that the distinct material properties already mean differences in all atomization, evaporation, and mixing characteristics, hence, the latter result is not intuitive.

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Section: Spectral Analysis Of Diesel Oil Combustionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Comparison of Diesel and Crude Rapeseed Oil Combustion in a Swirl Burner

Józsa

2020

Applied Sciences

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“…The aviation sector is facing many problems at present such as high fuel costs, limited sources of fossil fuels, uneven distribution of fuels, and harmful emissions. 1,2 Therefore, it is imperative to search for sustainable and clean fuels that are can reduce toxic pollutants and greenhouse gas while not compromising the engine performance. 3,4 For all these reasons, the scientific community has taken an interest to look for a new fuel or modify the existing fuel with a vision of a new source of potential alternative fuel.…”

Section: Introductionmentioning

confidence: 99%

Combustion characteristics of butanol‐ Jet A‐1 fuel blends in a swirl‐stabilized combustor under the influence of preheated swirling air

Kumar

Chong

Karmakar

2021

Intl J of Energy Research

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Biofuels are carbon-neutral alternative fuels, which have emerged as an important source of energy for the aviation industry to reduce greenhouse gas emissions. Butanol is considered an emerging biofuel with properties that are suited for application in gas turbine engines. It is traditionally produced through the fermentation process of biomass (acetone-butanol-ethanol fermentation). To examine the feasibility of butanol as operating fuel, the combustion characteristics of butanol and butanol/Jet A-1 blends are examined in a labscale swirl stabilized burner, with emphasis on the effect of preheating because of the variation of inlet air temperature during flight operation. To rich the constant air temperature to 150 C, the incoming air (main air) is preheated and investigated for various equivalence ratios. Compared to neat Jet A-1, the flames of the butanol/Jet A-1 blends have shown a better effect on global emission characteristics with comparable temperature distribution on adding butanol to Jet A-1. A 50% butanol-loaded blends show a reduction of 29% CO and 24% NOx compared to neat Jet A-1 whereas 30% loading follows a similar trend, and the pollutant emission is slightly higher than the 50% blend case.Additionally, both 30% and 50% butanol blends show a comparable flame temperature distribution, which is higher than neat Jet A-1.

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“…These techniques are capable to achieve liquefaction of feedstocks with a yield of bio-oil/bio-crude at~60%, whereas the quality of these bioliquids are poor with high acidity, high moisture content and low calorific values. To fully use the raw bioliquid more efficiently, fractionation (e.g., distillation, extraction) has been recommended to separate raw products into different fractions (e.g., aqueous phase, hydrophobic light bio-oil, and heavy bio-oil) before further refining [10,11]. Both the light and heavy fractions can then be upgraded into drop-in fuels via hydrotreatment.…”

Section: Introductionmentioning

confidence: 99%

Integrated Leaching and Thermochemical Technologies for Producing High-Value Products from Rice Husk: Leaching of Rice Husk with the Aqueous Phases of Bioliquids

Gao

Karnowo

et al. 2020

Energies

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It remains challenging to develop a techno-economically feasible method to remove alkali and alkaline earth metal species (AAEMs) from rice husk (RH), which is a widely available bioresource across the world. In this study, the AAEMs leaching effect of aqueous phases of both bio-crude prepared by hydrothermal liquefaction (AP-HT) and bio-oil prepared by pyrolysis (AP-Pyro) of RH were systematically investigated. The results indicated that although the acidity of AP-HT and AP-Pyro are much lower than that of HCl, they performed a comparable removal efficiency on AAEMs (Na: 56.2%, K: 96.7%, Mg: 91.0%, Ca: 46.1% for AP-HT, while Na: 58.9%, K: 96.9%, Mg: 94.0%, Ca: 86.3% for AP-Pyro) with HCl. The presence of phenolics in bio-oil could facilitate the penetration of water and organic acids into the inner area of RH cells, thus enhancing the AAEMs removal via chelate reactions. The thermal stability of leached RH during thermochemical conversions was studied via TG and Py-GC-MS. The results showed that the heat conduction efficiency in leached RH was enhanced with a high pyrolysis rate, resulting in a narrow carbon chain distribution (C5–C10) of derived chemical compounds.

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Bioliquids and their use in power generation – A technology review

Cited by 41 publications

References 103 publications

Experimental Comparison of Diesel and Crude Rapeseed Oil Combustion in a Swirl Burner

Experimental Comparison of Diesel and Crude Rapeseed Oil Combustion in a Swirl Burner

Combustion characteristics of butanol‐ Jet A‐1 fuel blends in a swirl‐stabilized combustor under the influence of preheated swirling air

Integrated Leaching and Thermochemical Technologies for Producing High-Value Products from Rice Husk: Leaching of Rice Husk with the Aqueous Phases of Bioliquids

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