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Bioresour Technol. 2016 Jan;200:789-94. doi: 10.1016/j.biortech.2015.10.076. Epub 2015 Oct 30.

Effect of fuel origin on synergy during co-gasification of biomass and coal in CO2.

Author information

1
School of Energy and Power Engineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian City 116024, China. Electronic address: zhang.yan@dlut.edu.cn.
2
School of Energy and Power Engineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian City 116024, China.

Abstract

The effect of fuel origin on synergy in coal/biomass blends during co-gasification has been assessed using a congruent-mass thermogravimetry analysis (TGA) method. Results revealed that synergy occurs when ash residuals are formed, followed by an almost complete gasification of biomass. Potassium species in biomass ash play a catalytic role in promoting gasification reactivity of coal char, which is a direct consequence of synergy during co-gasification. The SEM-EDS spectra provided conclusive evidence that the transfer of potassium from biomass to the surface of coal char occurs during co-pyrolysis/gasification. Biomass ash rich in silica eliminated synergy in coal/biomass blends but not to the extent of inhibiting the reaction rate of the blended chars to make it slower than that of separated ones. The best result in terms of synergy was concluded to be the combination of low-ash coal and K-rich biomass.

KEYWORDS:

Biomass; Co-gasification; Coal; Synergy; TGA

PMID:
26580896
DOI:
10.1016/j.biortech.2015.10.076
[Indexed for MEDLINE]

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