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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

Postal Subscription Code 80-972

2018 Impact Factor: 1.701

Front. Energy    2021, Vol. 15 Issue (2) : 374-383    https://doi.org/10.1007/s11708-020-0710-3
RESEARCH ARTICLE
Experimental study on influence of operating parameters on tar components from corn straw gasification in fluidized bed
Shuai GUO, Xiao WEI, Deyong CHE, Hongpeng LIU, Baizhong SUN()
School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China
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Abstract

Gasification is a promising approach for converting solid fuel sources, including renewable ones like biomass, for use. The main problem in biomass gasification is the formation of condensable tars, including polycyclic aromatic hydrocarbons (PAHs). This paper investigated the conversion of tar components during corn straw gasification. It analyzed collected tar components using a gas chromatograph-mass spectrograph (GC-MS). Experimental results indicate that, with increasing temperature from 700°C to 900°C, the concentrations of benzene, indene, phenanthrene, naphthalene, acenaphthylene, fluorene, and pyrene increased whereas those of toluene, phenol, 1-methylnaphthalene, and 2-methylnaphthalene decreased. As the equivalence ratio (ER) increased from 0.21 to 0.34, the concentrations of indene and phenanthrene increased from 0.148% and 0.087% to 0.232% and 0.223%, respectively. Further, the phenol content increased as ER increased from 0.21 to 0.26 and then decreased as the ER increased further to 0.34. Other parameters like the steam/biomass (S/B) ratio and catalyst also played a critical role in tar reduction. This paper demonstrates the conversion of some tar components and elucidates their chemical properties during gasification.

Keywords gasification      tar components      operating parameters     
Corresponding Author(s): Baizhong SUN   
Online First Date: 24 December 2020    Issue Date: 18 June 2021
 Cite this article:   
Shuai GUO,Xiao WEI,Deyong CHE, et al. Experimental study on influence of operating parameters on tar components from corn straw gasification in fluidized bed[J]. Front. Energy, 2021, 15(2): 374-383.
 URL:  
https://academic.hep.com.cn/fie/EN/10.1007/s11708-020-0710-3
https://academic.hep.com.cn/fie/EN/Y2021/V15/I2/374
Ultimate analysis/(wt%, ar) Proximate analysis/(wt%, ar) Three components analysis
Car 42.04 Moisture Mar 4.89 Cellulose 27.9
Har 5.13 Ash Aar 8.79 Hemicellulose 18.1
Oar 38.23 Volatile Var 70.18 Lignin 23.4
Nar 0.69 Fixed carbon FCar 16.14
Sar 0.23
Tab.1  Proximate and elemental analyses
Fig.1  Internal circulating fluidized bed gasifier system.
Compounds Formula Structure Tar group
Benzene C6H6 Class 3
Phenol C6H6O Class 3
Toluene C7H8 Class 3
Indene C9H8 Class 4
Naphthalene C10H8 Class 4
1-methylnaphthalene C11H10 Class 4
2-methylnaphthalene C11H10 Class 4
Acenaphthylene C12H10 Class 4
Fluorene C13H10 Class 4
Phenanthrene C14H10 Class 4
Pyrene C16H10 Class 5
Tab.2  Identified tar components with the structure and classification
Parameter Test No.
1 2 3 4 5 6 7 8 9 10 11 12
Temperature/°C 700 740 770 820 700 700 700 700 700 700 800 900
ER 0.21 0.26 0.31 0.34 0.21 0.21 0.21 0.21 0.21 0.21 0.21 0.21
S/B 0 0 0 0 0.2 0.4 0.6 0 0 0 0 0
DMP/wt% 0 0 0 0 0 0 0 15 30 50 0 0
CO2/vol% 17.1 17.8 18.8 20.2 17.8 19.2 21.7 17.2 18.1 19.0 16.5 15.7
CO/vol% 14.7 15.5 16.4 15.2 12.9 11.6 10.0 15.7 17.4 18.0 16.4 17.8
CH4/vol% 6.36 7.24 7.89 6.41 4.21 2.02 1.29 5.44 4.04 3.0 6.07 5.6
H2/vol% 7.58 7.93 8.91 8.07 9.71 13.3 15.3 8.31 9.79 10.9 7.97 8.35
Tar content/(g·m–3) 6.2 5.56 4.69 3.97 5.34 4.33 3.41 5.11 3.81 2.85 4.18 2.02
Tab.3  Summary of operating condition and results during fluidized bed gasification of corn straw
Fig.2  Evolution of tar components based on variation in temperature (ER= 0.21).
Fig.3  Evolution of components based on variation in ER.
Fig.4  Evolution of tar components based on S/B (700 °C, ER= 0.21).
Fig.5  Evolution of tar components based on dolomite mixing proportion (700 °C, ER= 0.21).
Fig.6  Schematic diagram of formation of tar components during gasification.
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