The influence of different chemical compositions in biomass on gasification tar formation

Qin, Yuhong; Campen, Adam; Wiltowski, Tomasz; Feng, Jie; Li, Wenying

doi:10.1016/j.biombioe.2015.09.001

Cited by 49 publications

(24 citation statements)

References 27 publications

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“…This effect of temperature on the phenol yield is consistent with literature [13,20,35]. Phenol mainly derives from lignin degradation [3,36] and at high temperature (> 850°C) phenol is converted mainly to non-oxygenated aromatics (naphthalene and benzene) and secondly to noncondensable species (CO and CO 2 ), instead of char [35,37]. As torrefaction typically results in increasing the lignin content [4], torrefied feedstocks are expected to result in a higher phenol yield.…”

Section: Phenol and Pahssupporting

confidence: 83%

The impact of dry torrefaction on the fast pyrolysis behavior of ash wood and commercial Dutch mixed wood in a pyroprobe

Tsalidis

Tsekos

Anastasakis

et al. 2018

Fuel Processing Technology

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In this study torrefied feedstocks, consisting of mixed wood and wood residues torrefied at 300°C and ash wood torrefied at 250 and 265°C, were pyrolyzed in a pyroprobe at five pyrolysis temperatures (600-1000°C) and a fast heating rate (600°C•s −1) to investigate the effect of torrefaction on the formation of volatiles and their evolution in a 100 kW circulating fluidized bed gasifier. Results showed that torrefaction converted mostly the hemicellulose content of feedstocks. Furthermore, torrefaction resulted in decreasing the bio-oil and gas yields, increasing the char and phenol yields and not affecting the polyaromatic hydrocarbons yield. Phenol and naphthalene showed the largest yield at 600-700°C and 800-1000°C, respectively. At such high temperatures, the rest polyaromatic hydrocarbons showed yields similar to phenol's. At 900°C torrefaction affected mainly the phenolic species, with 4-propyl-phenol being the dominant species of its group for mixed wood and wood residues feedstock. In the gasifier, H 2 and CO 2 yields increased, CH 4 yield remained constant, and CO yield depended on tar conversion and oxidation and steam reactions. The phenol and naphthalene yields further decreased and increased, respectively, whereas, polyaromatic hydrocarbons did not change in the gasifier.

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Section: Phenol and Pahssupporting

confidence: 83%

The impact of dry torrefaction on the fast pyrolysis behavior of ash wood and commercial Dutch mixed wood in a pyroprobe

Tsalidis

Tsekos

Anastasakis

et al. 2018

Fuel Processing Technology

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show abstract

“….973 ×10 -5 17254.4 -9061227 2 1.068×10 -3 10224.4 -6123081 81 3 5.7×10 5 Table 3-Optimum values of non-isothermal pyrolysis [18]. Figure 5-Comparison for gas volumetric composition (vertical axis) between the present work and other experimental work for same (feedstock, , and MC), (a) Rubber wood [27], (b) Wood pellets [36], (c) rice husk [37], (d) Bamboo [25], (e) Neem [25], and (f) saw dust [7] Figure 6-Comparisons between the experimental [28] and present work for the tar yield in producer gas.…”

Section: List Of Figures and Tablesmentioning

confidence: 72%

An integrated kinetic model for downdraft gasifier based on a novel approach that optimises the reduction zone of gasifier

Salem

Paul

2018

Biomass and Bioenergy

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“…This may be due to the fracturing of the C–C and CC bonds in aliphatic compounds and the fracturing of branch chains in single-cyclic aromatic hydrocarbons as the temperature increases, leading to an increase in the contents of H 2 , CO, and other combustible gases. After the fracturing of the bonds, unsaturated hydrocarbons polymerize or get incorporated into the aromatic rings to form relatively stable polycyclic aromatic hydrocarbons (PAHs), resulting in an increase in class 4 and class 5 tars. ,, Simultaneously, the molecular thermal stability leads to a progressive increase in heavier aromatics at higher temperatures . Kuba et al also pointed out that aromatic compounds tend to combine with one another to form a higher degree of polycyclic structure at a higher temperature.…”

Section: Results and Discussionmentioning

confidence: 99%

Experimental Study on Product Gas and Tar Removal in Air–Steam Gasification of Corn Straw in a Bench-Scale Internally Circulating Fluidized Bed

Guo

Xiao

et al. 2020

Energy Fuels

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Excessive consumption of fossil fuels and its negative global effects have resulted in increasing interest in biomass energy. This paper presents an experimental study on biomass gasification reactions in an internally circulating fluidized bed gasifier (ICFBG). This work uses compressed corn straw as the raw material and studies the influence of different factors (temperature, equivalent ratio (ER), catalyst, and S/B ratios) on gasification products, in which S/B ratios are defined as the ratios of the steam rate to the biomass feeding rate. The experimental results show that when the bed material is the coal ash residue and air is used as the gasification agent, an increase in temperature from 700 to 900 °C reduces the CO2 and CH4 contents, whereas the H2 and CO contents increase. When a gasification agent is air–steam and the temperature is maintained at 700 °C, with a gradual increase in the amount of steam supplied to the gasifier, the CO2 and H2 contents gradually increase. Besides, an increase in the temperature, S/B ratio, and mixing proportion of dolomite leads to a gradual decrease in the tar content as well as the proportion of light tar, while the proportion of heavy tar becomes relatively high. In addition, we obtained experimental data for an actual gasifier and conducted a brief comparative analysis with the ICFBG developed in this study. The results show that the data provided by the ICFBG developed in this study can serve as a reference and theoretical basis for the operation of actual gasifiers in power plants.

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The influence of different chemical compositions in biomass on gasification tar formation

Cited by 49 publications

References 27 publications

The impact of dry torrefaction on the fast pyrolysis behavior of ash wood and commercial Dutch mixed wood in a pyroprobe

The impact of dry torrefaction on the fast pyrolysis behavior of ash wood and commercial Dutch mixed wood in a pyroprobe

An integrated kinetic model for downdraft gasifier based on a novel approach that optimises the reduction zone of gasifier

Experimental Study on Product Gas and Tar Removal in Air–Steam Gasification of Corn Straw in a Bench-Scale Internally Circulating Fluidized Bed

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