Abstract
The results presented in the following paper are making the aim of a broadly research concentrated to investigate the temperature effects on agricultural waste pyrolysis performed in a batch reactor. Briefly, the motivation along with experimental features and main results generated from the rape straw low temperature pyrolysis (300°C-500°C) have been offered in the first part submitted at the MSE 2019 conference, with the title: Bio-gaseous fuels from agricultural waste pyrolysis (Part I). The current section (second part of the study) presents the results obtained in case of the rape straw high temperature pyrolysis (600°C-800°C). Overall, as expected, the augmentation of the operating temperature, inhibits the bio-oil and biochar formation, enhancing the pyrolysis gas production. The distribution of gaseous components varies depending on temperature and residence time. The transition stages and the formation of the main pyrolysis gaseous species are also presented and discussed. The most dominant chemical element from the pyrolysis gas is N2, due to its constant presence as non-oxidant agent in the process. Considering the same premise, the rape straw pyrolysis gaseous species distribution in the temperature range of 600°C-800°C varies between: 47%-58% CO2, 18%-28% CO, 14%-35% H2, while the pyrolysis gas density 1.1-1.4 kg/m3 and higher heating value 23-52 MJ/kg.
Highlights
Climate change, together with finding promising feedstock for alternative fuels and waste disposal, are one of the main global environmental issues, making renewable energy a topic of growing importance
Further we will refer to the outcomes generated by the experiments concerning high temperature pyrolysis of the rape straw
These will be compared with the results obtained from the low temperature pyrolysis applied to agriculture biomass residues
Summary
Together with finding promising feedstock for alternative fuels and waste disposal, are one of the main global environmental issues, making renewable energy a topic of growing importance. In recent years the first two products already mentioned are the most attractive products of pyrolysis, but the process can be optimized to produce bio-gas because it can be used as fuel, as it has a high calorific value. The present study deals to investigate the effect of the process temperature on the pyrolysis bio-gaseous product in order to optimize the process to produce gas with energy content higher than initial agriculture biomass. Chemical compounds of pyrolysis gas relevant to fuel applications were assessed in case of rape straw fast pyrolysis processes In this context, empirical approaches to evaluate the energy value and density of the bio-gaseous product of pyrolysis process were applied
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