Numeric Model for Assessment of Naphthalene Conversion through Ionization Reactions in a Microwave Air Plasma Torch

Pilatau, A.; Medeiros, H. S.; Sobrinho, Argemiro Soares da Silva; Filho, Gilberto Petraconi

doi:10.1021/acs.energyfuels.6b01048

Cited by 2 publications

(1 citation statement)

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“…However, the radicals may be produced not only due to thermal dissociation but also thanks to vibrational excitation, which is typical for MWP and compounds like CO 2 , H 2 , and N 2 [48,49]. The direct influence of electrons or ions is rather negligible in the case of MWP due to low energy of the former [48] one and low concentration of the latter one [50]. More information considering MWP characteristics and its influence on tar compounds conversion may be found in the previous works [28,40].…”

Section: Mwp Impact On the Aromatic Compoundsmentioning

confidence: 99%

Sewage Sludge-Derived Producer Gas Valorization with the Use of Atmospheric Microwave Plasma

Wnukowski

Kordylewski

Łuszkiewicz

et al. 2019

Waste Biomass Valor

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Atmospheric microwave plasma was applied to the processing of the partially cleaned producer gas obtained from sewage sludge gasification. The plasma processing resulted in residual tar compounds conversion and changes in the gas composition. During the tests with a different gas flow rates and microwave power inputs, liquid and gaseous samples were collected to evaluate the plasma reactor's performance. The conversion efficiency ranged from 19 to 100% and it depended on the specific energy input (SEI), gas flow rate, initial tar concentration, and the nature of the tars compounds. Generally, it was shown that the conversion rate increased with the SEI and that the aliphatic, cyclic and substituted compounds were converted much easier than benzene. Moreover, applying plasma led to the production of heavier aromatics (i.e. naphthalene, indene, acenaphthylene) but the rise in their concentration was significantly smaller than the amount of converted compounds. The gas composition changes revealed in the increase of H 2 and CO concentration that was an effect of hydrocarbons and CO 2 conversion. Additionally, it was indicated that the microwave plasma reactor's performance was noticeably worse than in the case of the laboratory test with a simulated producer gas. This was mainly attributed to differences in the reactors' geometry, lower hydrogen concentration and the presence of inorganic deposit on the reactor's walls that might have inhibited microwaves transfer. In general, the microwave plasma technology seems promising in the context of cleaning and upgrading the producer gas, however, further optimization research is necessary to make it more reliable and less energy consuming. Graphic AbstractBiomass-derived producer gas treatment in the context of tar conversion is a current and important research issue. Many plasma techniques have been investigated to solve the problem of tar's presence. However, most of them considered simplified model mixtures of gas and a model tar compound. There is a negligible amount of research that applies a real producer gas obtained in the gasification process. Moreover, none of them includes microwave plasma, which has a few promising features considering producer gas valorization. Therefore, the main goal and novelty of this work were to investigate the microwave plasma treatment of the gas derived from sewage sludge gasification and to compare it with the results obtain in laboratory research using model mixtures.

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