Abstract
Lignin and cellulose chemicals were used as artificial biomass components to make-up a simulated biomass. Alkali and Alkaline Earth Metal (AAEM) as well as volatile matter contents in these chemicals were much different from each other. Co-gasification of coal with simulated biomass shows improved conversion characteristics in comparison to the average calculated from separate conversion of coal and simulated biomass. Two conversion synergetic peaks were observed whereby the first peak occurred around 400℃ while the second one occurred above 800℃. Although co-gasification of coal with lignin that has high AAEM content also shows two synergy peaks, the one at higher temperature is dominant. Co-gasification of coal with cellulose shows only a single synergy peak around 400℃ indicating that synergy at low temperature is related with interaction of volatiles. Investigation of morphology changes during gasification of lignin and coal, suggests that their low reactivity is associated with their solid shape maintained even at high temperature.
Highlights
Owing to predicted low supply capacity of fossil fuel reserves against the growing energy demand in addition to environmental issues resulting from fossil fuel combustion, alternative sources and alternative conversion methods have to be exploited
We have investigated on conversion characteristics during co-gasification of coal with simulated biomass composed of cellulose and lignin chemicals
Two conversion synergy peaks were observed in their co-gasification characteristics, one extending from 300 ̊C to 550 ̊C and the other peak occurring above 800 ̊C for co-gasification of lignin with coal
Summary
Owing to predicted low supply capacity of fossil fuel reserves against the growing energy demand in addition to environmental issues resulting from fossil fuel combustion, alternative sources and alternative conversion methods have to be exploited. Biomass is one of the alternative energy sources, which can be utilized through thermal, chemical or biological conversions methods. Contribution to synergetic characteristics by interactions between biomass volatiles or other hydrogen donors with coal char matrix through hydrogen transfer has been reported [2,8,9]. The differences in temperature gradient and gas diffusion capacity of biomass and coal plays a significant role on improving conversion characteristics during co-processing [2,3,9]
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