Key thermal events during pyrolysis and CO 2 -gasification of selected combustible solid wastes in a thermogravimetric analyser

Chen, Tianju; Wu, Jianhui; Zhang, Zhezi; Zhu, Mingming; Sun, Li; Wu, Jinhu; Zhang, Dongke

doi:10.1016/j.fuel.2014.07.077

Cited by 31 publications

(8 citation statements)

References 27 publications

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“…In previous research, the kinetic analysis of biomass pyrolysis [24,25] and the characterizations of biochar, syngas and bio-oil were investigated [26,27]. The main objective of this research was to investigate the characteristics of biochar, syngas and bio-oil from slow pyrolysis of white ash wood, switchgrass and corn stover at the temperature range from 300°°C to 500°°C.…”

Section: Introductionmentioning

confidence: 99%

Characterization of energy carriers obtained from the pyrolysis of white ash, switchgrass and corn stover — Biochar, syngas and bio-oil

Chen

Liu

Scott

2016

Fuel Processing Technology

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a b s t r a c t a r t i c l e i n f oThe pyrolysis of three representative sources of biomass, namely, white ash, switchgrass and corn stover were investigated using a fixed-bed reactor to observe and compare the characterizations of three energy carriers, biochar, syngas and bio-oil. The characteristics of biochar were determined by Fourier Transform Infrared Spectroscopy (FT-IR), X-ray diffractometer (XRD) and Scanning Electron Microscopy Energy Dispersive Spectroscopy (SEM-EDS), Gas Chromatography (GC) and Gas Chromatography Mass Spectrometry (GC-MS).The results showed that the carbon content of biochar increased with the increase of pyrolysis temperature. More than 52 wt.% of the carbon was captured in the biochar. The infrared spectra of char samples illustrated that various bands in the spectra were identified, corresponding to stretches -NH-, aliphatic stretches -CH-, stretches conjugate -C_C-, -CH 3 and stretches -C\ \O-. The surface morphology of biomass sample changed after pyrolysis and carbon fiber can be formed at the temperature of 500°C. The content of combustible gas CH 4 , H 2 and CO was changed from 50% to 70%. The GC-MS analysis of bio-oil showed that most of the chemical compounds detected were phenolic ones. This study provides a useful reference for energy carriers from the pyrolysis of biomass.

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Section: Introductionmentioning

confidence: 99%

Characterization of energy carriers obtained from the pyrolysis of white ash, switchgrass and corn stover — Biochar, syngas and bio-oil

Chen

Liu

Scott

2016

Fuel Processing Technology

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“…The furnace doors were then opened and the chamber was allowed to cool overnight. Since pyrolysis of the parent biomass should near completion at 700 °C, this high temperature process was selected to produce an energy dense, low-oxygen charcoal product [21]. A higher temperature would favor carbon reduction reactions that decrease charcoal yield with little pieces were then placed in a custom stainless steel chamber designed for lab-scale charcoal production ( Figure 2).…”

Section: Methodsmentioning

confidence: 99%

“…The furnace was then programmed to turn off at 700 • C. The furnace doors were then opened and the chamber was allowed to cool overnight. Since pyrolysis of the parent biomass should near completion at 700 • C, this high temperature process was selected to produce an energy dense, low-oxygen charcoal product [21]. A higher temperature would favor carbon reduction reactions that decrease charcoal yield with little gain in charcoal energy density, and a lower temperature would not allow complete pyrolysis and would produce a higher charcoal yield at the cost of charcoal energy density [22].…”

Section: Methodsmentioning

confidence: 99%

Analysis of Micronized Charcoal for Use in a Liquid Fuel Slurry

Long

Boyette

2016

Energies

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Yellow poplar (Liriodendron tulipifera) was chosen as the woody biomass for the production of charcoal for use in a liquid fuel slurry. Charcoal produced from this biomass resulted in a highly porous structure similar to the parent material. Micronized particles were produced from this charcoal using a multi-step milling process and verified using a scanning electron microscope and laser diffraction system. Charcoal particles greater than 50 µm exhibited long needle shapes much like the parent biomass while particles less than 50 µm were produced with aspect ratios closer to unity. Laser diffraction measurements indicated D10, D50, and D90 values of 4.446 µm, 15.83 µm, and 39.69 µm, respectively. Moisture content, ash content, absolute density, and energy content values were also measured for the charcoal particles produced. Calculated volumetric energy density values for the charcoal particles exceeded the No. 2 diesel fuel that would be displaced in a liquid fuel slurry.

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“…In contrast, when steam was used as the gasifying medium, the methane-reforming reaction was found to be dominant, resulting in higher hydrogen formation, thus increasing the H 2 / CO ratio 11 . Although the pyrolysis of plastics involves breaking of C-C and C-H bonds to form smaller molecules, CO 2 does not react with these hydrocarbon fragments 17 . Hence, the major mechanism that contributes to a higher generation of CO and higher carbon conversion is possibly the Boudouard reaction.…”

Section: Number Of Orifices 10000mentioning

confidence: 99%

Performance Prediction of Waste Polyethylene Gasification Using CO2 in a Bubbling Fluidized Bed: A Modelling Study

Alli¹

2018

Chem.Biochem.Eng.Q.

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Gasification of carbonaceous materials using CO 2 from flue gases is an effective and economic means of waste recycling and environmental CO 2 mitigation system. The paper presents investigation on conversion of plastics, such as (poly) ethylene, into valuable gaseous products, primarily Syngas or synthesis gas using CO 2 as a gasifying agent instead of conventional steam. Typically, gasification is carried out in a fluidized bed reactor followed by sequential separation of syngas from tar and other undesired gaseous products. In this research work, the effect of operating conditions of the fluidized bed reactor on carbon conversion and H 2 /CO mole ratio was examined. For this purpose, a process model of CO 2 gasification of waste plastics using fluidized bed reactor was developed in ASPEN PLUS ®. Sensitivity analysis concluded that parameters like CO 2-feed ratio, residence time, and gasification temperature serve to control the yield and quality of syngas.

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Key thermal events during pyrolysis and CO 2 -gasification of selected combustible solid wastes in a thermogravimetric analyser

Cited by 31 publications

References 27 publications

Characterization of energy carriers obtained from the pyrolysis of white ash, switchgrass and corn stover — Biochar, syngas and bio-oil

Characterization of energy carriers obtained from the pyrolysis of white ash, switchgrass and corn stover — Biochar, syngas and bio-oil

Analysis of Micronized Charcoal for Use in a Liquid Fuel Slurry

Performance Prediction of Waste Polyethylene Gasification Using CO2 in a Bubbling Fluidized Bed: A Modelling Study

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