A Study of Pyrolysis of Macadamia Nut Shell: Parametric Sensitivity Analysis of the Ipr Model

Xavier, Thiago Padovani; Lira, Taísa Shimosakai de; Schettino, Miguel A.; Barrozo, M. A. S.

doi:10.1590/0104-6632.20160331s00003629

Cited by 25 publications

(14 citation statements)

References 24 publications

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“…(b) Calculated DTG curves for cellulose, derived for E=100 kJ/mol. Figure 9: Simultaneous evaluation of experimental data from macadamia nut shell pyrolysis at different heating rates [45]; dashed line: experimental, solid line: calculated.…”

Section: Discussionmentioning

confidence: 99%

“…first-order nth-order literature [45] E HCE / kJ mol −1 125.9 131.4 132.2-150.6 A HCE / s −1 1.9 × 10 9 6.6 × 10 9 2.9 × 10 9 -1.8 × 10 11 E CELL / kJ mol − [43], is 78% of holocellulose (hemicellulose + cellulose), 20% of lignin, and 2% of extractives on a dry basis. Taking into account that lignin is the major contributor to char formation [44], the calculated results seem consistent with the experimental data, since in the volatile there is a bigger fraction of holocellulose than in the raw biomass.…”

Section: Multi-component Mechanismmentioning

confidence: 99%

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Quantitatively modelling kinetics through a visual analysis of the derivative thermogravimetric curves: Application to biomass pyrolysis

Martí-Rosselló

Jun

Lue

2018

Energy Conversion and Management

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Analytic relations are developed that directly link visually observable features of differential thermogravimetric (DTG) curves (e.g., peak temperature, height, width, skewness and conversion at the peak) to the parameters of chemical reaction kinetics models (e.g., activation energy and prefactor), which can be used to study the thermal decomposition of solid fuels. General expressions suitable for any reaction model are provided, as well as explicit expressions for nth order reactions with a rate constant given by the Arrhenius equation. This approach is illustrated for the pyrolysis of biomass, where it is found to provide a rapid and accurate estimate of the relative contributions of cellulose, hemicellulose, and lignin to the volatile yield, as well as their kinetic parameters. The method offers a simple way to obtain the model reaction kinetics parameters from thermogravimetric data and saves computing time by providing sensible initial values and bounds of the fit parameters.

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Section: Discussionmentioning

confidence: 99%

Section: Multi-component Mechanismmentioning

confidence: 99%

Quantitatively modelling kinetics through a visual analysis of the derivative thermogravimetric curves: Application to biomass pyrolysis

Martí-Rosselló

Jun

Lue

2018

Energy Conversion and Management

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“…In pyrolysis, a feedstock source is thermochemically converted into gas, biochar, and bio‐oil. This process has been largely investigated with excellent results, including a high bio‐oil yield and the production of valuable chemical compounds; however, there remain gaps in knowledge that need to be filled, including rational energy use and improved product quality for a specific biomass. Microalgae are an alternative biomass source and their use has some advantages over that of other raw materials.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the behavior of Chlamydomonas reinhardtii and Spirulina platensis in solar catalytic pyrolysis

et al. 2020

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Summary The aim of this study was to investigate the behavior of two distinct microalgae species during solar catalytic pyrolysis and the influence of their chemical composition and the process variables (biomass charge, reaction time, and catalyst percentage) on the product yields and bio‐oil composition. For this purpose, solar catalytic pyrolysis of Spirulina platensis and Chlamydomonas reinhardtii was performed using hydrotalcite‐derived mixed oxides as the catalyst. To gain more insight into the effect of composition on pyrolysis behavior, the biomasses were analyzed using various analytical techniques. The results indicated that a high percentage of catalyst (47.1%) culminated in liquid yields of 42.48% and 21.31% for Chlamydomonas pyrolysis and Spirulina pyrolysis, respectively. Additionally, Spirulina pyrolysis resulted in higher solid yields compared with Chlamydomonas pyrolysis. The results also showed that Spirulina bio‐oil was rich in oxygenated compounds, probably due to its high carbohydrate content, whereas Chlamydomonas bio‐oil was rich in nitrogenated compounds because of its higher protein content. The microalgae composition (lipids, protein, carbohydrates) exerted a large influence on the catalytic pathways and led to differences in yield and product distribution. A high percentage of catalysts preferentially promoted a deoxygenation of the bio‐oil obtained from Spirulina solar pyrolysis compared with that obtained from Chlamydomonas pyrolysis.

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“…Previous research has shown that macadamia shell charcoal has benefits over conventional wood burning stoves in so far as it is able to capture free electrons to free radicals such as super oxides that exists in nature and can radiate increased infrared, which is 6-14 micron wavelength radiation with a high penetrating power. As a result, it can be used to cook foods faster, which in turn generates energy savings of almost 20 percent [4][5]. Therefore, this research has attempted to study whether it is possible to combine green fuel briquettes from waste agricultural materials (corn stalks) with charcoal to improve fuel quality by combining these waste agricultural materials with macadamia shell charcoal.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties of Green Fuel Briquettes from Residue Corncobs Materials Mixed Macadamia Shell Charcoal Powder

Teeta

Nachaisin

Wanish

2017

J. Phys.: Conf. Ser.

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Abstract. The objective of this research was to produce green fuel briquettes from corncobs by adding macadamia shell charcoal powder. The study was sectioned into 3 parts: 1) Quality improvement of green fuel briquettes by adding macadamia; 2) Fuel property analysis based on ASTM standards and thermal fuel efficiency; and 3) Economics appropriateness in producing green fuel briquettes. This research produced green fuel briquettes using the ratio of corncobs weight and macadamia shell charcoal powder in 100:0 90:10 80:20 70:30 60:40 and 50:50 and pressing in the cold briquette machine. Fuel property analysis showed that green fuel briquettes at the ratio 50:50 produced maximum heating values at 21.06 Megajoule per kilogram and briquette density of 725.18 kilograms per cubic meter, but the percent of moisture content, volatile matter, ash, and fixed carbon were 10.09, 83.02, 2.17 and 4.72 respectively.The thermal efficiency of green fuel briquettes averaged 20.22%. Economics appropriateness was most effective where the ratio of corncobs weight to macadamia shell charcoal powder was at 50:50 which accounted for the cost per kilogram at 5.75 Baht. The net present value was at 1,791.25 Baht. Internal rate of return was at 8.62 and durations for a payback period of investment was at 1.9 years which was suitable for investment.

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A Study of Pyrolysis of Macadamia Nut Shell: Parametric Sensitivity Analysis of the Ipr Model

Cited by 25 publications

References 24 publications

Quantitatively modelling kinetics through a visual analysis of the derivative thermogravimetric curves: Application to biomass pyrolysis

Quantitatively modelling kinetics through a visual analysis of the derivative thermogravimetric curves: Application to biomass pyrolysis

A comparative study of the behavior of Chlamydomonas reinhardtii and Spirulina platensis in solar catalytic pyrolysis

Thermal Properties of Green Fuel Briquettes from Residue Corncobs Materials Mixed Macadamia Shell Charcoal Powder

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