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Abstract
Air gasification of Napier grass (NG) was studied with the target of producing combustible synthesis gas to be used in direct combustion for power generation. A small-scale autothermal bubbling fluidized bed gasifier was used to investigate the effect of reactor temperature, equivalence ratio (ER), and static bed height (SBH) on gasification performance and combustibility of the producer gas. The main generated species in syngas were identified through gas chromatography (GC) analysis. Minimum fluidization conditions were determined at different levels of SBH. Experiments carried out with two intentions of first, to achieve the highest composition of combustible species to ensure the maximum Lower Heating Value (LHV) of syngas and second, to obtain a high performance process with maximum yield of syngas and minimum residues. The results showed that the temperature and ER have significant effects on syngas yield and composition. SBH was found have a substantial effect on the production of H2 and CO. The results from this study was compared to other gasification studies from literature which have evaluated biomass gasification in bubbling fluidized bed reactors with different scales but almost similar method of experimentation. The purpose of verification was to demonstrate the effect of different reactor scales and heating characteristics on the results.
Highlights
Biomass gasification is a promising renewable energy generation technology for a cleaner and sustainable future
A study on air gasification of Napier grass (NG) to produce combustible synthesis gas was investigated with the target of using direct combustion for power generation
A small-scale autothermal bubbling fluidized bed gasifier with 5 kW power capacity was used to investigate the effect of operating parameters, namely, reactor temperature, equivalence ratio (ER), and static bed height (SBH), on the yield and composition of syngas
Summary
Biomass gasification is a promising renewable energy generation technology for a cleaner and sustainable future. Gasification can play a crucial role as an alternative to current energy technologies, which are mostly fossil-based fuels; it reduces the dependence on energy from petroleum sources [1,2]. Current gasification technologies are not yet as efficient and powerful as they are expected to be. There are a number of common and technology-specific limitations that make biomass gasification a complex and sensitive process, such as instable operation, handling of residues, fuel preparation, cost of setup/ maintenance, and the proper state of the producer gas in terms of chemical and physical properties [3]. The drawbacks are even more emphasized when dealing with an autothermal reactor because it introduces a number of further considerations related to start-up heating and preparation. The temperature in autothermal gasifiers is determined by the equivalence ratio (ER), and to ensure high temperature for gasification, air/oxygen
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