A Novel Compact Bio-filter System for a Down-draft Gasifier: An Experimental Study

Rameshkumar, R.; Mayilsamy, K.

doi:10.1016/j.aasri.2012.11.111

Cited by 7 publications

(10 citation statements)

References 9 publications

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“…The lower outlet tar content using corn cobs may be attributed to the two layers of sponges used in combination with the corn cobs. The tar removal efficiency of the wood shavings filter obtained in this study (10%) was much lower compared to 97% reported using a water scrubber and coconut coir filter [17] and 94% using spray towers and wood shavings filter [19]. Observation of biomass filter layers (Treatment I in Figure 7) revealed that more tar was adsorbed at the upper section and around the periphery of the filter.…”

Section: Tar Reduction Efficiency Of Wood Shavings Filter (Treatment I)mentioning

confidence: 88%

“…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%

“…Biomass-based dry filters could be an economical and environmental friendly option. Biomass-based filters using corn cobs, wood shavings, and dry coconut coir, charcoal and saw dust have been explored [17][18][19]. Corn cobs and woodchips reduced the tar content to 2 g/Nm 3 [18].…”

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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Section: Tar Reduction Efficiency Of Wood Shavings Filter (Treatment I)mentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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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Experimental investigation of downdraft biomass gasifier fed by sugarcane bagasse and coconut shells

Awais

Munir

et al. 2020

Biomass Conv. Bioref.

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A Novel Compact Bio-filter System for a Down-draft Gasifier: An Experimental Study

Cited by 7 publications

References 9 publications

Effects of Syngas Cooling and Biomass Filter Medium on Tar Removal

Effects of Syngas Cooling and Biomass Filter Medium on Tar Removal

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

Experimental investigation of downdraft biomass gasifier fed by sugarcane bagasse and coconut shells

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