Studies for removal of tar from producer gas in small scale biomass gasifiers using biodiesel

Madav, Vasudeva; Das, Darpan; Kumar, Manish; Surwade, Manoj; Parikh, P.P.; Sethi, Virendra

doi:10.1016/j.biombioe.2019.02.006

Cited by 16 publications

(10 citation statements)

References 19 publications

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“…Naphthalene was the most abundant compound in the light PAHs group, accounting for 10.1 wt% in total tar and 31.8 wt% in light PAHs. This result was in good correlation with previous work from Madav et al (2019). They showed that naphthalene accounted for 5 to 9% in total tar from a 35 kW downdraft gasifier.…”

Section: Major Tar Compounds In Raw Producer Gas and Depositssupporting

confidence: 91%

Major tar compounds in raw producer gas and deposits from a small downdraft gasifier: Analysis and comparison

Cong

Enomoto

Naryyanto

et al. 2020

BioRes

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Tar is an undesirable product of biomass gasification. Tar analysis is a challenging task because it is a complex mixture. The objectives of this study are to identify and quantify the major tar compounds in raw producer gas and deposits from a 10 kW downdraft gasifier using cedar pellets. Gas chromatography-mass spectrometry (GC-MS) was used to analyze the 16 tar samples from raw producer gas under varying airflow rates and four tar samples from the deposit inside the suction pump after long-term operation. The results showed that tar in raw producer gas and tar deposits consisted of about 46 and 28 major chemical compounds, respectively. Tar in raw producer gas was found to contain three main groups of substances, including acids/ketones with 32.1 wt%, heterocyclics with 30.0 wt%, and light poly-aromatic hydrocarbons (light PAHs) with 31.8 wt%. Heterocyclic and light PAH compounds dominated in tar deposits and accounted for 58.6 wt% and 36.2 wt%, respectively. It was observed that the tar condensation problem was dominated by the components and the molecular weight of tar compositions instead of the tar concentration. These findings are useful for optimizing the gasification process and developing the gas cleaning system for a small downdraft gasifier.

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Section: Major Tar Compounds In Raw Producer Gas and Depositssupporting

confidence: 91%

Major tar compounds in raw producer gas and deposits from a small downdraft gasifier: Analysis and comparison

Cong

Enomoto

Naryyanto

et al. 2020

BioRes

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“…Produced wastewater needs to be treated, while the used oil can be returned to the system and gasified as a fuel. [3,8] A tar removal efficiency of between 55% and 80% can be achieved using waste cooking oil as the scrubber media. [25] Unyaphan et al [26] improved the tar removal efficiency by bubbling the syngas through a venturi scrubber filled with oil.…”

Section: Introductionmentioning

confidence: 99%

Tar removal from the producer gas of a small scale downdraft gasifier using a fatty acid based, wet packed‐bed scrubber

Lotfi,

Ma,

Austin

et al. 2023

Can J Chem Eng

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Small scale gasification combined heat and power (CHP) systems offer an alternative to diesel fuelled generators for power generation in remote communities and industrial sites. Tar and particulates in the producer‐gas can damage the internal combustion engine generator and increase operation and maintenance costs. In this work, we present a novel trickle‐bed scrubber using filtered waste cooking oil as a cost effective and easy‐to‐operate gas clean‐up method for a small CHP system. The performance of the trickle‐bed scrubber was compared against a packed‐bed filter utilizing woodchips in a 20 kWth downdraft gasifier. Used‐cooking oil was selected as the solvent and woodchips as the bed‐material as these are readily available, inexpensive, and can be recycled in the gasifier as fuel. A woodchip packed‐bed filter reduced the tar and particulate matter (PM) in the producer gas from gasification of spruce chips (11% moisture) from 1.6 to 1.4 g/Nm3 and from 0.16 to 0.087 g/Nm3 respectively. The trickle‐bed scrubber was able to reduce the tar and PM in the producer gas from gasification of pinewood (8% moisture) from 1.38 to 0.28 g/Nm3, and 0.209 to 0.082 g/Nm3, respectively. Tar and PM removal efficiency improved by 60% and 29% respectively. Components such as benzene, toluene, naphthalene, and biphenylene were the major tar components. After passing the trickle‐bed, most tar was removed, with a preference for removal of multi‐ringed aromatics and gravimetric tars. Parameters such as the tar and particulate concentration, feedstock moisture content, and feedstock source affect the performance of the gas clean‐up system.

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“…The advantage of a scrubber unit is related to the possibility to use the same unit as both quencher and absorber. For instance, after the gasifier, a wet scrubber with an organic liquid (e.g., bio-diesel) may be used for quenching the hot syngas and for removing the hydrophobic and heavy tar molecules from the syngas [ 12 ]. The exhausted bio-diesel could be used as fuel for energy production [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Purification of Wastewater from Biomass-Derived Syngas Scrubber Using Biochar and Activated Carbons

Catizzone

Sposato

Romanelli

et al. 2021

IJERPH

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Phenol is a major component in the scrubber wastewater used for syngas purification in biomass-based gasification plants. Adsorption is a common strategy for wastewater purification, and carbon materials, such as activated carbons and biochar, may be used for its remediation. In this work, we compare the adsorption behavior towards phenol of two biochar samples, produced by pyrolysis and gasification of lignocellulose biomass, with two commercial activated carbons. Obtained data were also used to assess the effect of textural properties (i.e., surface area) on phenol removal. Continuous tests in lab-scale columns were also carried out and the obtained data were processed with literature models in order to obtain design parameters for scale-up. Results clearly indicate the superiority of activated carbons due to the higher pore volume, although biomass-derived char may be more suitable from an economic and environmental point of view. The phenol adsorption capacity increases from about 65 m/g for gasification biochar to about 270 mg/g for the commercial activated carbon. Correspondingly, service time of commercial activated carbons was found to be about six times higher than that of gasification biochar. Finally, results indicate that phenol may be used as a model for characterizing the adsorption capacity of the investigated carbon materials, but in the case of real waste water the carbon usage rate should be considered at least 1.5 times higher than that calculated for phenol.

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Studies for removal of tar from producer gas in small scale biomass gasifiers using biodiesel

Cited by 16 publications

References 19 publications

Major tar compounds in raw producer gas and deposits from a small downdraft gasifier: Analysis and comparison

Major tar compounds in raw producer gas and deposits from a small downdraft gasifier: Analysis and comparison

Tar removal from the producer gas of a small scale downdraft gasifier using a fatty acid based, wet packed‐bed scrubber

Purification of Wastewater from Biomass-Derived Syngas Scrubber Using Biochar and Activated Carbons

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