Development of Tar Removal Technologies for Biomass Gasification using the By-products

Nakamura, Shunsuke; Unyaphan, Siriwat; Yoshikawa, Kunio; Kitano, Shigeru

doi:10.1016/j.egypro.2015.07.305

Cited by 15 publications

(7 citation statements)

References 4 publications

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“…In previous studies, tar removal technologies have been developed [11][12][13][14] which can be characterized into two approaches: (i) primary method in which tar is reduced within the gasifiers, and (ii) secondary method in which tar is removed through post-gasifier processes [15]. Although tar removal after gasification is necessary to achieve the gas purity required by the downstream processing, it increases operating costs and reduces the overall efficiency of the gasification process [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of tar formation and producer gas composition in biomass steam gasification in a 100 kW dual fluidised bed gasifier

Zhang

Pang

2019

Renewable Energy

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of tar formation and producer gas composition in biomass steam gasification in a 100 kW dual fluidised bed gasifier

Zhang

Pang

2019

Renewable Energy

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“…As noted, in the introduction, the definition of "tar" is somewhat arbitrary and must either be related to a standard or it is effectively defined by how it is collected. The choice of the 0°C is in line with other works [38,39], which also used trapping system in ice bath for tar collection from upstream. The trapping system used here could be modified to change the tars collected, if required.…”

Section: Approach To Tar Quantificationmentioning

confidence: 77%

Pyrolysis of wood pellets in the presence of oxygen carriers in a fluidised bed coupled with a DBD reactor for tar quantification

Zheng

Grant²,

2019

Chemical Engineering Journal

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The pyrolysis of wood in the presence of chemical looping agents including Fe 2 O 3 , mayenite-supported CuO and mayenite-supported Cu 2 O was studied from 773 to 1173 K. A continuous tar quantification system, based on a DBD reactor downstream of the fluidised bed, was developed to allow quantification of the tar formed. An oxygen-containing plasma was used to convert volatiles and tars to measurable carbon-containing species, mainly CO, CH 4 , and CO 2 . It was found that pyrolysis of the wood in alumina sand produced CH 4 , CO, CO 2 , tar and char as the main products. Tar cracking was observed above 1073 K, and this mainly generated CH 4 . Both Fe 2 O 3 and mayenite-supported Cu-based oxides were effective for in situ combustion of the pyrolysis products, particularly tar, at temperatures exceeding 873 K. Mayenite-supported CuO showed the highest reactivity. The results showed the potential of using metal oxides for direct combustion of biomass, and particularly converting the tarry products during devolatisation. The better activity of mayenite-supported CuO compared to Fe 2 O 3 and Cu 2 O in these experiments was mainly due to the ability of CuO to release gaseous oxygen at higher temperatures.

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“…[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. [26] On average, tar removal efficiency was 87% during 20 h of operation, and naphthalene and phenol were removed completely.…”

Section: Introductionmentioning

confidence: 99%

“…During regeneration of the oil for 10 min (600 s) every 2 h (7200 s) using a centrifuge at 30 rpm, tar removal efficiency reached 98%, and after 10 h (36 000 s) of operation, it was reduced to 91%. Nakamura et al [25] used bio-oil and char that were produced during gasification for tar removal. [25,27] The bio-oil was removed by a centrifuge from the producer gas before the bio-oil scrubber.…”

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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Development of Tar Removal Technologies for Biomass Gasification using the By-products

Cited by 15 publications

References 4 publications

Experimental investigation of tar formation and producer gas composition in biomass steam gasification in a 100 kW dual fluidised bed gasifier

Experimental investigation of tar formation and producer gas composition in biomass steam gasification in a 100 kW dual fluidised bed gasifier

Pyrolysis of wood pellets in the presence of oxygen carriers in a fluidised bed coupled with a DBD reactor for tar quantification

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

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Development of Tar Removal Technologies for Biomass Gasification using the By-products

Cited by 15 publications

References 4 publications

Experimental investigation of tar formation and producer gas composition in biomass steam gasification in a 100 kW dual fluidised bed gasifier

Experimental investigation of tar formation and producer gas composition in biomass steam gasification in a 100 kW dual fluidised bed gasifier

Pyrolysis of wood pellets in the presence of oxygen carriers in a fluidised bed coupled with a DBD reactor for tar quantification

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

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Experimental investigation of tar formation and producer gas composition in biomass steam gasification in a 100 kW dual fluidised bed gasifier

Experimental investigation of tar formation and producer gas composition in biomass steam gasification in a 100 kW dual fluidised bed gasifier