Tar removal performance of bio-oil scrubber for biomass gasification

Nakamura, Shunsuke; Unyaphan, Siriwat; Yoshikawa, Kunio; Kitano, Shigeru; Kimura, Shuji; Shimizu, Hiroyuki; Taira, Kazuya

doi:10.1080/17597269.2014.1002994

Cited by 21 publications

(16 citation statements)

References 27 publications

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“…Water was initially investigated, but due to the large proportion of nonpolar 14 hydrophobic components in tar, it showed a poor removal efficiency of only 31.8%. 15 Some hydrophobic oils have been considered, including diesel fuel, which showed a toluene removal efficiency of 95%, 16 waste cooking oil, which achieved 81.4% 17 tar removal, and bio-oil, which provided 56.8% 18 tar removal. However, these media had adverse impacts as their vapors increased the gravimetric tar.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Comprehensive Evaluation of Vegetable Oils for Biomass Tar Absorption

Wang

Tao

et al. 2020

ACS Omega

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Biomass tar is the bottleneck of biomass gasification, which not only is adverse to energy production but also brings severe environmental issues. A scrubber with vegetable oil is considered as a low-cost but efficient approach for tar removal, but the effects of oil’s properties on different tar absorptions were rarely reported. In this study, canola oil, palm oil, and pure oleic acid and linoleic acid, which are the main compounds of vegetable oils, were employed for absorptive removal of benzene, toluene, and phenol. The degree of unsaturation, average molecular weight, and average chain length of solvents were quantitatively characterized. A series of time and temperature-dependent absorption experiments were conducted, and the relationship between oils’ properties and absorption performances was built. Results showed that pure oleic acid had the biggest absorption capacity for benzene and toluene due to the mono-unsaturated structure. Increasing the average molecular weight and chain length also enhanced tar absorption. Moreover, Grey relative analysis was employed to investigate the influence of each factor on tar absorption. The average molecular weight exerted the most significant influence on tar absorption in the tested temperature range whose comprehensive relevance coefficients reached the highest at 0.9810, 0.7669, and 0.7739 for benzene, toluene, and phenol, respectively. This study puts more attention on the nature of vegetable oils, and we hope to provide useful information for modulating a better oil-based scrubber medium and further enhancing tar absorptive removal.

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Section: Introductionmentioning

confidence: 99%

Experimental and Comprehensive Evaluation of Vegetable Oils for Biomass Tar Absorption

Wang

Tao

et al. 2020

ACS Omega

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“…Besides disposal of tar-mixed solvent, major disadvantages of using a wet cleaning system include decrease in heating value of the producer gas and the net energy efficiency. Therefore, development of tar removal technology with low cost, minimal disposal issues, and high efficiency are instrumental for future of gasification-based technologies [5,16]. Biomass-based dry filters could be an economical and environmental friendly option.…”

Section: Introductionmentioning

confidence: 99%

“…Corn cobs and woodchips reduced the tar content to 2 g/Nm 3 [18]. To further improve tar removal, other studies have used forms of direct cooling system, including wet scrubbers and water spray towers, before a dry biomass filter [15][16][17]. However, wet cleaning systems require expensive waste water treatment, so safe discharge of the tar mixed solution is a challenge [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…To further improve tar removal, other studies have used forms of direct cooling system, including wet scrubbers and water spray towers, before a dry biomass filter [15][16][17]. However, wet cleaning systems require expensive waste water treatment, so safe discharge of the tar mixed solution is a challenge [15][16][17]. A series of heat exchangers [20][21][22] and oil scrubber [23][24][25][26][27] have shown to be effective in reducing tar to as low as 10 mg/Nm 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Impurities-such as tars, particulate matters, sulfur, and ammonia-are produced during gasification and entrained in the syngas. In most Removal of tar from the syngas is done either by chemical methods, such as catalytic and thermal cracking [5,13,14], which are expensive to operate [5,15] or by physical methods, such as wet scrubbers and water spray, which have issues with disposing tar mixed solvents [15][16][17]. Besides disposal of tar-mixed solvent, major disadvantages of using a wet cleaning system include decrease in heating value of the producer gas and the net energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Syngas Cooling and Biomass Filter Medium on Tar Removal

et al. 2017

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Biomass gasification is a proven technology; however, one of the major obstacles in using product syngas for electric power generation and biofuels is the removal of tar. The purpose of this research was to develop and evaluate effectiveness of tar removal methods by cooling the syngas and using wood shavings as filtering media. The performance of the wood shavings filter equipped with an oil bubbler and heat exchanger as cooling systems was tested using tar-laden syngas generated from a 20-kW downdraft gasifier. The tar reduction efficiencies of wood shavings filter, wood shavings filter with heat exchanger, and wood shavings filter with oil bubbler were 10%, 61%, and 97%, respectively.

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Experimental and Modeling Studies on the Removal of Tars from Coal‐Derived Syngas Using Methyl Oleate

2021

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The absorption of model tar compounds (benzene, toluene, and xylene) in methyl oleate is studied in a fixed-bed absorption column. The dynamic system involving the recirculation of the tar-rich solvent is modeled as a combination of various steady-state snapshots in time, and this approach effectively predicts the performance of the absorber. The rate-based model shows a good agreement with the experimental data as compared to the equilibrium-based model. Further, a pilotscale absorber is designed for the removal of tars from syngas generated in a coalto-methanol plant. The validated rate-based model is used to predict the effect of various operating and geometry parameters on the absorption efficiency of the pilot-scale absorber. The regeneration of the solvent by steam stripping and reboiled stripping is evaluated.

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Tar removal performance of bio-oil scrubber for biomass gasification

Cited by 21 publications

References 27 publications

Experimental and Comprehensive Evaluation of Vegetable Oils for Biomass Tar Absorption

Experimental and Comprehensive Evaluation of Vegetable Oils for Biomass Tar Absorption

Effects of Syngas Cooling and Biomass Filter Medium on Tar Removal

Experimental and Modeling Studies on the Removal of Tars from Coal‐Derived Syngas Using Methyl Oleate

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