A wet packed-bed scrubber for removing tar from biomass producer gas

Lotfi, Samira; Ma, Weiguo; Austin, Kevin; Kumar, Ashwani

doi:10.1016/j.fuproc.2019.05.024

Cited by 23 publications

(16 citation statements)

References 16 publications

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“…( 1), while the overall cleaning efficiency was calculated using Eq. ( 2) [8]: where C i, before Abs 1) is the mass concentration of PM before the absorber, C i, after Abs the mass concentration of PM after the absorber, and n the number of stages.…”

Section: Equipmentmentioning

confidence: 99%

“…According to the literature, when comparing the various gas purification methods, packed-bed wet scrubbers (chemical scrubbers and bio-scrubbers) have proven to be the most attractive technologies due to their low price, high efficiency, and ability to remove solid and liquid pollutants [8][9][10][11][12][13]. The conventional mechanism of the wet scrubber with a packed bed (the chemical scrubber) involves the capture of PM from flue gas by passing the gas stream through a column filled with packing material, with the absorption solution being supplied to the packing material [8]. However, removing the PM, which can be smaller than 1 mm, from the flue gas with the wet-scrubber method is complicated [14].…”

Section: Introductionmentioning

confidence: 99%

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Efficient Cleaning and Heat Recovery of Flue Gas from a Small‐Scale Boiler

2021

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Small-scale biomass boilers contribute to the emission of particulate matter (PM) to the environment. In this study, the performance of a wet-scrubber purification system for flue gas was experimentally investigated. The experimental setup consisted of a boiler, a wet scrubber, a generator, and heat exchangers. The results showed an average PM collection efficiency of ca. 42 % for a PM size range of 0.08-10 mm over a testing period of five months. Furthermore, the results showed an improvement in the heat recovery of about 18 %. Focusing only on the heat losses through exhaust flue gases, the losses were shown to have decreased by 72 %. During the total testing period of 8.5 months, no decrease could be noticed in the absorption solution ability.

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Section: Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Cleaning and Heat Recovery of Flue Gas from a Small‐Scale Boiler

2021

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“…Among which, due to the high adaptability, low construction and operation costs, and relative simplicity, the use of wet scrubbers has proven to be a feasible tar removal method, especially for small-scale gasification. 13 The key issue in this method is the selection of the absorption medium ( Table 1 ). 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%.…”

Section: Introductionmentioning

confidence: 99%

“…11 Among which, due to the high adaptability, low construction and operation costs, and relative simplicity, the use of wet scrubbers has proven to be a feasible tar removal method, especially for small-scale gasification. 13 The key issue in this method is the selection of the absorption medium (Table 1).…”

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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“…This system removes high molecular weight aromatic compounds of tar with 90% efficiency (Lotfi et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of tar arresting techniques and their evaluation for product syngas cleaning from bubbling fluidized bed gasifier

Hai

Sher

Zarren

et al. 2019

Journal of Cleaner Production

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Hazardous waste products along with the syngas produced from biomass gasification are one of the major problems of today world. Tar and other solid contaminants removal from syngas are necessary as it is widely used for the production of energy in thermal and power sectors. The raw syngas can be clean up by directly controlling the operating parameters and applying cleaning units. This study aimed to analyze bubbling fluidized bed gasifier and focuses on investigating the novel tar reducing techniques. Different cleaning units; char bed, woodchip bed and mop fan were used to arrest tar directly from producer gas. For the first time, a novel strategical technique of mop fan based on water spray was evaluated. Results showed that tar arrest with bio-char is unsuccessful due to the burning of bed while the average concentration of tar captured by woodchips and mop fan with or without water spray was 0.459 mg/L, 0.987 mg/L and 0.617 mg/L respectively. Furthermore, the concentration of naphthalene and phenanthrene reduced

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A wet packed-bed scrubber for removing tar from biomass producer gas

Cited by 23 publications

References 16 publications

Efficient Cleaning and Heat Recovery of Flue Gas from a Small‐Scale Boiler

Efficient Cleaning and Heat Recovery of Flue Gas from a Small‐Scale Boiler

Experimental and Comprehensive Evaluation of Vegetable Oils for Biomass Tar Absorption

Experimental investigation of tar arresting techniques and their evaluation for product syngas cleaning from bubbling fluidized bed gasifier

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