Catalytic microwave-assisted torrefaction of sugarcane bagasse with calcium oxide optimized via Taguchi approach: Product characterization and energy analysis

Arpia, Arjay A.; Chen, Wei‐Hsin; Ubando, Aristotle T.; Tabatabaei, Meisam; Lam, Su Shiung; Culaba, Alvin B.; Luna, Mark Daniel G. de

doi:10.1016/j.fuel.2021.121543

Cited by 27 publications

(12 citation statements)

References 54 publications

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“…ANOVA was also used in research on the production of biochar, bio-oil, and biogas from sugarcane bagasse [ 40 ], torrefaction of palm kernel shells [ 41 , 42 ], torrefaction at temperatures from 200 °C to 300 °C of three types of Jatrofy biomass [ 43 ], and wet torrefaction of Korean pine [ 27 ].…”

Section: Methodsmentioning

confidence: 99%

Physicochemical Properties of Biochar Produced from Goldenrod Plants

et al. 2022

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Torrefaction is one of the methods of thermal treatment of biomass, which allows obtaining a product of better quality in the form of biochar. The aim of the paper was to analyze the possibility of using goldenrod (Solidago canadensis, Solidago gigantea) for the production of biochar. The torrefaction process involved the vegetative and generative parts as well as the whole plant at temperatures of 250 °C and 275 °C, for 3 h. Next, the physicochemical properties of the raw material and biochar were determined, namely moisture content, ash content, volatile matter content, calorific value, and heat of combustion. The bulk density of raw biomass and biochar was also determined. It was found that after biomass torrefaction, the ash content, calorific value, and heat of combustion increased, while volatile matter content decreased. It has been observed that in both the case of raw biomass and biochar, the plant species and the sampled parts have a significant impact on the ash content, volatile matter content, calorific value, and heat of combustion.

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Section: Methodsmentioning

confidence: 99%

Physicochemical Properties of Biochar Produced from Goldenrod Plants

et al. 2022

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“…At the conventional heating level, the temperature and concentration gradients work in opposite directions. As a result, it can be assumed that there are differences in the final yields and composition of the pyrolysis products under both heating systems due to the specific MW effect [14,21]. In the present work, the compositions of solid char fractions and tar fractions, defined, correspondingly, as main-and side-stream products of torrefaction of three types of lignocellulosic biomass, mainly softwood, wheat straw, and peat in the form of commercial pellets, were studied.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the search for innovative heating methods that are able to decrease the energy consumption for processing and improve the yield and quality of the product is an urgent task. One of these approaches-the use of microwave (MW) irradiation at the frequency of 2.45 GHz-is an alternative source of energy instead of conventional heating at thermal conversion of lignocellulosic biomass [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Main- and Side-Stream Products of Microwave Assisted Torrefaction of Lignocellulosic Biomass of Different Origination

et al. 2022

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In this paper, the yields and composition of solid and condensable products that were obtained by microwave-assisted torrefaction of softwood, wheat straw, and peat fuel pellets, defined as main- and side-stream torrefaction products, were studied. The torrefaction process, at temperatures varied in the range of 200–300 °C, was performed using a laboratory-scale torrefactor of original construction. Water-enriched fractions were distilled off from condensable products to isolate tar fractions, the fuel characteristics of which were compared with those of solid fractions. Py-GC/MS/FID, GC/MS/FID, thermal analysis, elemental analysis, and wet chemistry methods were used to characterize the main- and side-stream torrefaction products, with a focus on their valorization according to the biorefinery approach. The simultaneous development of the destruction and condensation processes in lignocarbohydrate complexes during microwave treatment leads to an increase in the relative portion of aromatic compounds in torrefied biomass, increasing the higher heating value (HHV) of the solid fractions. The increase up to 60% of the heat amount that was liberated due to the thermal oxidative conversion of solid fractions vs. that of the non-treated ones was established by DSC tests. The heat that was liberated by the combustion of the tar fractions was much lower than that of solid fractions, which was explained by the composition of tars, influencing their thermal conversion.

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“…This study employs this method to analyze the importance of the factors based on their influences on the objective functions. The analysis results for the 10‐, 20‐ and 30‐cell stacks at a confidence interval of 95% 43 are shown in Tables 4‐6, respectively. Each table contains the data of degrees of freedom (DF), adjusted sum of squares (AdjSS), adjusted sum of mean squares (AdjMS), F value, and P value 44 for the objective functions.…”

Section: Resultsmentioning

confidence: 99%

“…Each table contains the data of degrees of freedom (DF), adjusted sum of squares (AdjSS), adjusted sum of mean squares (AdjMS), F value, and P value 44 for the objective functions. The F value represents the factor's influence, and the P value indicates the factor's significance 43 . A higher F value means that the factor is more influential, and a lower P value implies that the factor is more significant.…”

Section: Resultsmentioning

confidence: 99%

Multi‐objective optimization design for pressure uniformity in a proton exchange membrane fuel cell stack

Chen

Lin

et al. 2022

Intl J of Energy Research

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Summary For a proton exchange membrane fuel cell (PEMFC), the pressure uniformity of fluid in the stack is a significant factor influencing the cell performance. This study employs the multi‐objective genetic algorithm (MOGA) to optimize the pressure uniformity in a PEMFC stack by adjusting the geometric design of inlet and outlet flow channels. The flow channel geometry is divided into three parts or named factors: tube length, tapered tube length, and channel height. The target is to find the minimum pressure difference between the inlet and outlet flow channels and optimize the pressure uniformity in the stack. The Latin hypercube sampling (LHS) method is used to organize the simulations for the design of experiments (DoEs), and the genetic aggregation (GA) method is employed to generate the response surfaces of the three factors. The resultant response surfaces are utilized to analyze the effects of the three factors on two objective functions, namely, pressure uniformity and pressure drop. The analysis of variance (ANOVA) method is also used to evaluate the influences of the factors, and the results are consistent with those obtained by the response surface method. The results show that the channel height produces the greatest impact on pressure uniformity. An increase in channel height can improve the pressure uniformity and reduce the pressure drop between the inlet and outlet channels. The MOGA analysis determines the optimal geometric design where the maximized pressure uniformity is 0.97 and the minimized pressure drop is 31 kPa. The number of cells in the stack is also taken into consideration. It is found that the influence of the inlet/outlet channel geometry on pressure uniformity is more pronounced when the cell number increases. The results benefit the design of inlet/outlet flow channels and the improvement of pressure uniformity in a PEMFC stack.

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Catalytic microwave-assisted torrefaction of sugarcane bagasse with calcium oxide optimized via Taguchi approach: Product characterization and energy analysis

Cited by 27 publications

References 54 publications

Physicochemical Properties of Biochar Produced from Goldenrod Plants

Physicochemical Properties of Biochar Produced from Goldenrod Plants

Characteristics of the Main- and Side-Stream Products of Microwave Assisted Torrefaction of Lignocellulosic Biomass of Different Origination

Multi‐objective optimization design for pressure uniformity in a proton exchange membrane fuel cell stack

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