Experimental and numerical study of biomass flash pyrolysis in an entrained flow reactor

Sun, Shaozeng; Tian, Hongming; Zhao, Yijun; Sun, Rui; Zhou, Hao

doi:10.1016/j.biortech.2009.12.092

Cited by 102 publications

(51 citation statements)

References 24 publications

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“…They investigated the fast pyrolysis at high temperature reported that more than 75wt% of biomass was converted into gas at 1000°C. Sun et al 16 investigated the effect of temperature on fast pyrolysis of rice husk and saw dust in an entrained flow reactor.…”

Section: Effect Of Temperature On Product Yield From Fast Pyrolysismentioning

confidence: 99%

“…15 Although the exact mechanism of biomass pyrolysis is not clear, several kinetic models of varying complexity have been developed. [15][16][17][18][19] However the overall process can be explained using empirical models, such as presented by Kilzer and Briodo et al 20 According to their model, lignocellulosic materials follow one of two available pathways. At higher temperature, tar formation is favoured by the low activation energy of the reaction while at low temperatures, cellulose in the biomass sample converts into dehydro-cellulose which is converted into char and syngas.…”

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confidence: 99%

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Pyrolysis of waste biomass: investigation of fast pyrolysis and slow pyrolysis process conditions on product yield and gas composition

Waheed

Nahil

Williams

2013

Journal of the Energy Institute

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High temperature fast pyrolysis of wood, rice husk and forestry wood residue was carried out in a laboratory scale fixed bed reactor. The results were compared with pyrolysis of the biomass samples in a different reactor under slow pyrolysis conditions.There was a marked difference in product yield depending on heating rate, for example, the gas yield from slow pyrolysis was, 24.7wt.% for wood , 24.06wt.% for rice husks and 24.01wt.% for forestry residue; however, for fast pyrolysis the gas yields were 78.63 wt.%, 66.61wt.% and 73.91wt.% respectively. There were correspondingly significantly lower yields of oil and char from fast pyrolysis whereas for slow pyrolysis oil and char yields were higher. The composition of the product gases was also influenced by the heating rate. In additional experiments the influence of pyrolysis temperature was investigated under fast pyrolysis conditions from 750 to 1050°C. It was found that the increase in temperature increased overall gas yield and also increased hydrogen gas concentration with a decrease in CH 4 , CO 2 and C 2 -C 4 hydrocarbons. High gas yields of~90 wt% conversion of the biomass to gas was obtained during the pyrolysis of biomass at 1050°C. Steam was also added to the fast pyrolysis system to enhance the hydrogen production. The amount of hydrogen produced was found to significantly increase in the presence of added steam.

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Section: Effect Of Temperature On Product Yield From Fast Pyrolysismentioning

confidence: 99%

mentioning

confidence: 99%

Pyrolysis of waste biomass: investigation of fast pyrolysis and slow pyrolysis process conditions on product yield and gas composition

Waheed

Nahil

Williams

2013

Journal of the Energy Institute

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“…Currently, various technologies are used for the thermo-chemical conversion of biomass. The most commonly used technologies include direct combustion, gasification, thermal pyrolysis, liquefaction, and hydrogen production (Brown et al 2000;Demirbas 2002;Loffler et al 2002;Sheth and Babu 2009;Iliuta et al 2010;Sun et al 2010).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Yao

Yan

et al. 2017

BioResources

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Three typical biomass fuels-rice husk, rice straw, and corn cobs-were combusted to understand the effects of ashing temperature on ash fouling and slagging characteristics. The ashes generated from combustion at 600 °C and 815 °C were characterized thoroughly with regard to their chemical composition. The systematic slagging/fouling indices of biomass were used to study the effects of ashing temperature on ash fouling and slagging propensities. The results showed that ashing temperature had a remarkable influence on ash composition, particle size distribution, ash morphology, ash fusibility, and thermal properties. Increased ashing temperature resulted in the expansion of ash particles together with the volatilization of alkali metals in the form of inorganic salts. Morphology analysis indicated that high ashing temperatures promoted biomass ash slagging. Ash fusion points increased at elevated ashing temperatures, while the ash content decreased. As a result of the volatilization and decomposition of biomass ash, a four-step mechanism of weight loss was clearly identified by thermal analysis. All prepared biomass ashes resulted in slagging and fouling problems at different levels during the thermochemical conversion of biomass.

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“…on the thermogravimetric characterization of RH or RS (Worasuwannarak et al 2007;Sun et al 2010;Chen et al 2014;Gao et al 2015;Moliner et al 2016). For example, Moliner et al (2016) studied the thermal and thermo-oxidative characterization of rice straw for its use in energy valorization processes, as well as the influence of carrier gas (Ar and O2) on its pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

Comparing the Thermo-Physical Properties of Rice Husk and Rice Straw as Feedstock for Thermochemical Conversion and Characterization of their Waste Ashes from Combustion

Yao¹,

Xu²,

Liang³

2016

BioResources

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The thermogravimetric characterization and gas emission properties during the pyrolysis of rice husk (RH) and rice straw (RS) were compared, and the properties of waste rice husk ash (RHA) and rice straw ash (RSA) from the combustion process were investigated. The results showed that the pyrolysis of RH and RS followed a four-step mechanism. Comparing the emission properties of small molecule bio-syngas in the pyrolysis of these two biomass wastes implied that RS was more suitable for use as feedstock for thermochemical conversion. Chemical and phase analysis results indicated that the RSA was rich in K, Ca, and P and had good potential for use as a soil amendment or as a material for silicate ceramics. The RHA was rich in SiO2 and could be an ideal silica source for silicon compound preparation or a pozzolan source for blended cement concrete production. Morphology analysis on the ash samples revealed that the high content of alkali metals may cause the higher agglomeration tendency of RSA with respect to RHA. The contrast in pore properties of biomass char wastes isolated from the ashes indicated that the char wastes recovered from RHA would be better used as a low-cost precursor in activated carbon production.

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Experimental and numerical study of biomass flash pyrolysis in an entrained flow reactor

Cited by 102 publications

References 24 publications

Pyrolysis of waste biomass: investigation of fast pyrolysis and slow pyrolysis process conditions on product yield and gas composition

Pyrolysis of waste biomass: investigation of fast pyrolysis and slow pyrolysis process conditions on product yield and gas composition

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Comparing the Thermo-Physical Properties of Rice Husk and Rice Straw as Feedstock for Thermochemical Conversion and Characterization of their Waste Ashes from Combustion

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