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Energies 2014, 7(3), 1098-1148; doi:10.3390/en7031098
Review

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

1
 and 1,2,*
Received: 12 November 2013; in revised form: 21 January 2014 / Accepted: 5 February 2014 / Published: 25 February 2014
(This article belongs to the Special Issue Biomass and Biofuels 2013)
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Abstract: Biomass is relatively cleaner than coal and is the only renewable carbon resource that can be directly converted into fuel. Biomass can significantly contribute to the world’s energy needs if harnessed sustainably. However, there are also problems associated with the thermal conversion of biomass. This paper investigates and discusses issues associated with the thermal conversion of coal and biomass as a blend. Most notable topics reviewed are slagging and fouling caused by the relatively reactive alkali and alkaline earth compounds (K2O, Na2O and CaO) found in biomass ash. The alkali and alkaline earth metals (AAEM) present and dispersed in biomass fuels induce catalytic activity during co-conversion with coal. The catalytic activity is most noticeable when blended with high rank coals. The synergy during co-conversion is still controversial although it has been theorized that biomass acts like a hydrogen donor in liquefaction. Published literature also shows that coal and biomass exhibit different mechanisms, depending on the operating conditions, for the formation of nitrogen (N) and sulfur species. Utilization aspects of fly ash from blending coal and biomass are discussed. Recommendations are made on pretreatment options to increase the energy density of biomass fuels through pelletization, torrefaction and flash pyrolysis to reduce transportation costs.
Keywords: coal; biomass; co-gasification; synergy; thermal conversion coal; biomass; co-gasification; synergy; thermal conversion
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Tchapda, A.H.; Pisupati, S.V. A Review of Thermal Co-Conversion of Coal and Biomass/Waste. Energies 2014, 7, 1098-1148.

AMA Style

Tchapda AH, Pisupati SV. A Review of Thermal Co-Conversion of Coal and Biomass/Waste. Energies. 2014; 7(3):1098-1148.

Chicago/Turabian Style

Tchapda, Aime H.; Pisupati, Sarma V. 2014. "A Review of Thermal Co-Conversion of Coal and Biomass/Waste." Energies 7, no. 3: 1098-1148.


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