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. 2017 Mar 10;4(1):22.
doi: 10.3390/bioengineering4010022.

Influence of Torrefaction on the Conversion Efficiency of the Gasification Process of Sugarcane Bagasse

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Free PMC article

Influence of Torrefaction on the Conversion Efficiency of the Gasification Process of Sugarcane Bagasse

Anthony Anukam et al. Bioengineering (Basel). .
Free PMC article

Abstract

Sugarcane bagasse was torrefied to improve its quality in terms of properties prior to gasification. Torrefaction was undertaken at 300 °C in an inert atmosphere of N₂ at 10 °C·min-1 heating rate. A residence time of 5 min allowed for rapid reaction of the material during torrefaction. Torrefied and untorrefied bagasse were characterized to compare their suitability as feedstocks for gasification. The results showed that torrefied bagasse had lower O-C and H-C atomic ratios of about 0.5 and 0.84 as compared to that of untorrefied bagasse with 0.82 and 1.55, respectively. A calorific value of about 20.29 MJ·kg-1 was also measured for torrefied bagasse, which is around 13% higher than that for untorrefied bagasse with a value of ca. 17.9 MJ·kg-1. This confirms the former as a much more suitable feedstock for gasification than the latter since efficiency of gasification is a function of feedstock calorific value. SEM results also revealed a fibrous structure and pith in the micrographs of both torrefied and untorrefied bagasse, indicating the carbonaceous nature of both materials, with torrefied bagasse exhibiting a more permeable structure with larger surface area, which are among the features that favour gasification. The gasification process of torrefied bagasse relied on computer simulation to establish the impact of torrefaction on gasification efficiency. Optimum efficiency was achieved with torrefied bagasse because of its slightly modified properties. Conversion efficiency of the gasification process of torrefied bagasse increased from 50% to approximately 60% after computer simulation, whereas that of untorrefied bagasse remained constant at 50%, even as the gasification time increased.

Keywords: computer simulation; efficiency; gasification; sugarcane bagasse; torrefaction.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
A schematic diagrammatic representation of the equipment used for torrefaction of bagasse. Reproduced with permission from [45].
Figure 2
Figure 2
Images of sugarcane bagasse: (a) Torrefied at 300 °C with at a residence time of 5 min; (b) untorrefied.
Figure 3
Figure 3
Products obtained from bagasse torrefaction: (a) Product yield with SP, LP and GP representing the solid, liquid and gaseous products, respectively; (b) composition of gaseous products formed from sugarcane bagasse torrefaction at 300 °C, and at 5 min time of residence.
Figure 4
Figure 4
Mass and energy yield from SCB torrefied at 300 °C at a residence time of 5 min.
Figure 5
Figure 5
TGA and DTG plots of SCB obtained at 10 °C·min−1 heating rate: (a) torrefied SCB; (b) untorrefied SCB.
Figure 6
Figure 6
SEM images of SCB obtained under the same analysis condition with: (a) torrefied; and (b) untorrefied.
Figure 7
Figure 7
Syngas composition obtained after computer simulation of the gasification processes of (a) torrefied SCB; and (b) untorrefied SCB.
Figure 8
Figure 8
Conversion efficiency obtained after computer simulation of the gasification processes of torrefied and untorrefied SCB.

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