Adiabatic Fixed-Bed Gasification of Colombian Coffee Husk Using Air-Steam Blends for Partial Oxidation

Javier, Bonilla; Gordillo, G.

doi:10.1155/2017/3576509

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…This section compares the results of this study to others carried out by the authors, using steam-air mixtures as an oxidizer and the same biomass (Bonilla and Gordillo, 2017). The use of oxygen-mixtures as gasifying agent enhances the temperature along the gasifier, and hence the mole fractions of CO and H 2 in the syngas yield as compared to the use of steam-air-i.e., at SF = 0.4 and ER = 3.2, the CO and H 2 dry basis concentrations were 25 and 27.5%, respectively, for oxygen-steam, whereas these for gasification with air-steam were 12.4 and 12.4%, respectively.…”

Section: Multiple Linear Model For Co and H 2 Concentrationmentioning

confidence: 77%

“…A secondary oxygen injection of 33% of primary oxygen reduced the tar concentration from 15.78 to 10.24 g/Nm 3 . Bonilla and Gordillo (2017) performed experimental research on autothermal gasification of CH using air-steam blends as gasifying agents. In their research, Equivalence Ratio (ER) and Steam-Fuel Ratio (SF) were the parameters set which ranged 1.53-6.11 and 0.23-0.89, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Gasification of Coffee Husk Using Pure Oxygen-Steam Blends

2019

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This work discusses results on temperature profile, syngas composition, High Heating Value, and efficiency of a Coffee Husk counter-current fixed-bed gasification process, in which oxygen-steam blends were used as an oxidizing agent. The experimentation was carried out for various Equivalence Ratios (ER) and Steam-Fuel Ratios (SF), whose ranges were [1.6-5.6] and [0.4-0.8], respectively. The results show that increased steam (higher steam fuel ratios) improves the H 2 /CO molar ratio i.e., for a constant ER = 3.7 and SF at 0.4, 0.6, and 0.8, the H 2 /CO ratio was 1.2, 1.4, and 1.8, respectively. Also, the addition of steam tends to increase the syngas Higher Heating Value, which ranged between 7,714 kJ/m 3 at ER = 1.6 and SF = 0.4 and 8,841 kJ/m 3 at ER = 3.2 and SF = 0.8. On the other hand, increased ER (lower oxygen) decreases the Net Cold Gasification Efficiency (CGE NET) which was between 53% at ER = 5.6 and SF = 0.6 and 82% at ER = 1.6 and SF = 0.4. Results were also compared to results published before for gasification of the same biomass but using air-steam mixtures for partial oxidation. This comparison shows that the use of oxygen increases both the temperature profile in the bed and the yield of CO and H 2 contained in the syngas.

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Section: Multiple Linear Model For Co and H 2 Concentrationmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Experimental Gasification of Coffee Husk Using Pure Oxygen-Steam Blends

2019

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“…The development of cutting-edge technologies based on thermochemical processes for the transformation of second-generation feedstock into competitive biofuels has led to study new raw materials [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]. Biomass belongs to this kind of feedstock and previous research have confirmed many advantages on raw material to be converted via pyrolysis [11, 12, 13, 14, 15, 16, 17, 18, 19, 20].…”

Section: Introductionmentioning

confidence: 99%

Kinetic triplet of Colombian sawmill wastes using thermogravimetric analysis

Bonilla

Salazar

Mayorga

2019

Heliyon

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The potential of sawmill wastes as a raw material in pyrolysis process is presented in this study. Non-isothermal thermogravimetric analysis (TGA and DTG) and isoconversional methods were employed to determine triplet kinetic (activation energy, reaction model and pre-exponential factor). Through TGA and DTG, the conversion degree is described as a function of temperature for five heating rates (10, 20, 30, 40 and 50o C/min) and four model-free methods (Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), Friedman, and Vyazovkin) with temperatures ranging from 25 to 1000°C were employed. Isoconversional lines were built for every method at different isoconversional degrees α∈true[0,1true]. The activation energy E was found as a function of α in the interval χII=true[0.2,0.7true] where each isoconversional methods were in agreement and the estimated error was sufficiently small. Findings show the same activation energy profile independently of the isoconversional method. In particular the total variation of E in χII was as follows: 209.909–228.238 kJ/mol (FWO); 211.235–229.277 kJ/mol (KAS); 223.050–188.512 kJ/mol (Friedman), and 211.449 kJ/mol-229.512 kJ/mol (Vyazovkin). The reaction model of the process in χII matched with a two-dimensional diffusion (D2) by using a master-plot analysis. The calculated and reported parameters are fundamental information for the pyrolysis reactor design using Sawmill wastes as feedstock.

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“…Biomass with low calorific value results in poor and unstable combustion whereas biomasses with high ash content cause problems in burners and boilers due to the slag and dirt produced. Complete combustion and gasification of biomass with air have been deeply studied during the last decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2019

GJES

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Due to the increase of consumption in the world of energy and the pollution caused by fossil fuel combustion processes, it is necessary to generate new technologies for the use of alternative fuels, allowing to reduce the dependence on fossil fuels such as oil, gas and coal. In general, the combustion processes of fossil fuels produce greenhouse gases which increase the temperature of the environment and the deterioration of the ozone layer. Chemical equilibrium was used to estimate the species produced by adiabatic gasification with different air-vapor mixtures. By running the NASA CEA software (chemical equilibrium with applications), a thermochemical simulation was performed under two parameters: the equivalence ratio (ER) defined as stoichiometric air/air supplied to the reactor (1.5-6) and the steam-fuel ratio (0-1). Thus, the syngas composition showed the following ranges: CO (0% -14.7%), H2 (0% -36.7%), CH4 (0% -4.3%), CO2 (17% -22.7%). The calorific value of the gases and the energy conversion power were also calculated with the composition of the gases. Then, The Higher Heating Value (HHV) was calculated whose values aim to conclude that syngas generated can be classified as a poor fuel gas since the HHV ranged between 1992 kJ/SATP m 3 -7537 kJ/SATP m 3 .

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Adiabatic Fixed-Bed Gasification of Colombian Coffee Husk Using Air-Steam Blends for Partial Oxidation

Cited by 8 publications

References 23 publications

Experimental Gasification of Coffee Husk Using Pure Oxygen-Steam Blends

Experimental Gasification of Coffee Husk Using Pure Oxygen-Steam Blends

Kinetic triplet of Colombian sawmill wastes using thermogravimetric analysis

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