Effect of temperature on the gasification of olive bagasse particles

Almeida, António Bernardino de; Neto, Paula; Pereira, Isabel; Ribeiro, Albina; Pilão, Rosa

doi:10.1016/j.joei.2017.10.012

Cited by 32 publications

(24 citation statements)

References 14 publications

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“…The lower calorific value of the gas is approximately estimated from 9 to 12 MJ/Nm 3 for gasification of char with CO 2 and 7 to 12 MJ/Nm 3 with the steam. The main gasification LHV gas values obtained is higher than the results obtained by Almeida et al (2017) and Zhang et al (2017). The analysis Figures 4 and 5 show that the maximum values were obtained at 1050°C for a particle size of 630 μm reagent char of cashew wood (b), kaicedrat wood (c), peanut shell (a), cashew nut shell (d) and palm shell (e).…”

Section: Effect Of Temperature and Particle Size On The Lower Heatingmentioning

confidence: 65%

“…The influence of gasification temperature on conversion rates is very important, since all of thermo-chemical steps of the char-CO 2 and char-steam reactions for syngas production are temperature dependent (Almeida et al, 2017). The amount of volatile matter, which is cracked from the solid, is a function of temperature.…”

Section: Effect Of Temperature On the Rate Of Carbon Conversion (Steamentioning

confidence: 99%

“…Gasification products are used in several applications: for example the low calorific value gas can be used directly as a fuel gas in turbines and gas engines (Suopajärvi et al, 2013). It is obvious that the effects of temperature on the gas yield were also related with the LHV (Almeida et al, 2017;Zhang et al, 2017). Figures 4 and 5 show lower heating value (LHV) of the gas at different temperatures and with two particle sizes (630 -3000 µm).…”

Section: Effect Of Temperature and Particle Size On The Lower Heatingmentioning

confidence: 99%

See 2 more Smart Citations

Study of the reactivity of Casamance vegetable and agricultural waste char gasification with steam and CO2

Diedhiou¹,

Ndiaye²,

Bensakhria³

et al. 2018

Afr. J. Environ. Sci. Technol.

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The increasing energy demand coupled with the need to reduce greenhouse gas emissions and the threat of exhaustion of oil reserves make us consider a possible recourse to the use of biomass waste as a source of renewable energy. Nowadays, gasification is not yet economically and operationally attractive for the power industry and more research is needed to facilitate the process and improve the desirability of the gasification process. Gasification tests were conducted on five wastes char mainly of agro-sylvo-pastoral residues, in order to study the behaviors of char conversion based on experimental data. Peanut shells, palm shells, cashews nut shells, cashew wood and "kaicedrat" wood char obtained by pyrolysis at 450°C are used. The samples were gasified at three different reaction temperatures (950 to 1050°C) in a fixed bed reactor, using steam or CO 2 as gasification agent and with average fraction of particle size 630 and 3000 µm. The experimental parameters, which affect the char's reactivity, are reviewed similarly to those related to the char and its structural features and operation parameters. Gasification kinetic conversion was studied at different models: the volume reaction model (VRM) and shrinking core model (SCM) in order to interpret the char conversion data. Further, the activation energy and pre-exponential factor were determined using the Arrhenius correlation. The experimental results showed that more syngas ((CO + H 2)) of high quality were obtained at 1000 to 1050°C during char gasification with steam or CO 2. The present results showed that temperature has a positive effect on kinetic char conversion. In addition, the low heating values obtained as a function of temperature depend on the nature of sample. For further investigation, it can be shown that the reaction rate is dependent on the char samples. Thus comparing the five biomasses, particular importance about reactivity and lower heating value (LHV) is attached to cashew nut shells, palm shells and peanut shells.

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Section: Effect Of Temperature and Particle Size On The Lower Heatingmentioning

confidence: 65%

Section: Effect Of Temperature On the Rate Of Carbon Conversion (Steamentioning

confidence: 99%

Section: Effect Of Temperature and Particle Size On The Lower Heatingmentioning

confidence: 99%

See 1 more Smart Citation

Study of the reactivity of Casamance vegetable and agricultural waste char gasification with steam and CO2

Diedhiou¹,

Ndiaye²,

Bensakhria³

et al. 2018

Afr. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…High temperatures can also have an effect on producing flammable gases. The temperature in the reactor has a strong effect on the reaction activity that occurs in the reactor [6]. Carbon reacts with carbon dioxide (CO2) and water vapor (H2O) is more active at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

An increase in bed temperature on gasification of dual reactor fluidized bed

et al. 2018

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One of the main issues using biomass as fuel in air gasification is the dilution of its product gas by the nitrogen in the air. A dual reactor fluidized bed (DRFB) overcomes this problem in which the gasification and combustion reactions are decoupled and conducted in two separate fluidized bed reactors connected by circulating bed material. The DFRB unit made of 304 stainless steel pipe with a height of 100 and 150 cm, and inner diameters (i.d.) of 15.2 and 5.1 cm for gasifier and combustor respectively. The rice husk as fuel and quartz sand as bed material having the same size of 0.4 - 0.6 mm were applied in this investigation. Since the gasification process is an endothermic reaction, gasification temperatures are varied at 600°C to 700°C while combustion reactor were kept at 600°C using the electric heaters enclosed in ceramic cover. The superficial gas velocity in this study was kept constant at 17 m/s using the external air volumetric flux of the blower flow entering the DRFB loop. Gas gasification samples are then examined by gas chromatography to determine syngas content (CO, CH4 and H2). The test results showed that by the increasing temperature of the gasification reactor there was an increase in syngas especially CO gas conentration. The temperature increases in the gasification reactor (600°C, 650°C, 700°C) is able to increase the endothermic reaction in the gasification process which is dominated by CO gas production. The syngas efficiency was found to increase from 40.95% to 43.77%.as the temperature of the gasification reactor increased.

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“…The effect of temperature on olive pomace gasification was studied by Almeida [12], whose experiments showed that higher bed temperatures favored gas production as well as other gasification performance parameters. Puig-Gamero [13] compared olive pomace, coal and petcoke feedstocks in co-gasification processes, and the authors indicated that olive pomace blends presented the lowest devolatilization temperature, highest reactivity, highest H 2 emission and highest H 2 /CO ratio.…”

mentioning

confidence: 99%

Modelling and experimental analysis of a small-scale olive pomace gasifier for cogeneration applications: A techno-economic assessment

Cardoso

Silva

Eusébio

et al. 2019

CI&CEQ

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Article Highlights • A 2-D CFD multiphase model was employed to study olive pomace gasification • The most suitable end-use applications for the produced gas were assessed • The feasibility of performing olive pomace gasification in small-scale was addressed • A Monte Carlo sensitivity analysis was performed Abstract A 2-D numerical simulation approach was implemented to describe the gasification process of olive pomace in a bubbling fluidized bed reactor. The numerical model was validated under experimental gasification runs performed in a 250 kW th quasi-industrial biomass gasifier. The producer gas composition, H 2 / /CO ratio, CH 4 /H 2 ratio, cold gas efficiency and tar content were evaluated. The most suitable applications for the potential use of olive pomace as an energy source in Portugal were assessed based on the results. A techno-economic study and a Monte Carlo sensitivity analysis were performed to assess the feasibility and foresee the main investment risks in conducting olive pomace gasification in small facilities. Results indicated that olive pomace gasification is more suitable for domestic purposes. The low cold gas efficiency of the process (around 20%) turns the process more appropriate for producer gas production in small cogeneration facilities. Olive pomace gasification solutions showed viable economic performance in small cogeneration solutions for agriculture waste-to-energy recovery in olive oil agriculture cooperatives. However, the slender profitability may turn the project unattractive for most investors from a financial standpoint.

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Effect of temperature on the gasification of olive bagasse particles

Cited by 32 publications

References 14 publications

Study of the reactivity of Casamance vegetable and agricultural waste char gasification with steam and CO2

Study of the reactivity of Casamance vegetable and agricultural waste char gasification with steam and CO2

An increase in bed temperature on gasification of dual reactor fluidized bed

Modelling and experimental analysis of a small-scale olive pomace gasifier for cogeneration applications: A techno-economic assessment

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