Physicochemical Characterization of Representative Firewood Species Used for Cooking in Some Colombian Regions

Díez, Hernán E.; Pérez, Juan F.

doi:10.1155/2017/4531686

Cited by 31 publications

(18 citation statements)

References 48 publications

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“…The gasification temperatures reached by the woods favored thermal degradation of the biomass components. However, in the case of Pat‐20‐BC, a small peak is observed at approximately 340°C, which is commonly attributed to the presence of cellulose . This can be explained by the higher fuel–air equivalence ratio reached under this airflow rate (20 L/min); therefore, the gasification temperature is the lowest, and thus, a small fraction of cellulose could remain in the solid matrix of biochars.…”

Section: Resultsmentioning

confidence: 96%

Effects of wood biomass type and airflow rate on fuel and soil amendment properties of biochar produced in a top‐lit updraft gasifier

Díez

Pérez

2018

Env Prog and Sustain Energy

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In this study, the effects of biomass type and airflow rate on the fuel and soil amendment properties of a solid byproduct (biochar, BC) produced by gasification in a top‐lit updraft reactor are studied. The results indicate that biomass with the highest fuel value index produces BC with the highest quality as a solid fuel. The best properties as a soil amendment are reached by Gua‐30‐BC as follows: the cation‐exchange capacity (CEC) of 18.6 meq/100 g, the water holding capacity (WHC) of 438%, and the total oxidizable organic carbon (TOC) of 14.2%. When the airflow increases from 20 to 40 L/min, the properties of pine BC as a solid fuel are affected. An increase in the gasification temperature leads to a diminished bulk density. Moreover, the ash content increases affecting the heating value of BC, which decreases from 27.71 to 25.5 MJ/kg. The best properties of BC as a solid fuel are reached at 20 L/min. The properties of BC as a soil amendment are affected with increased airflow as follows: the CEC decreases by 22.8%, TOC increases by 232.3%, and WHC increases by 7.6%. The best properties of BC as a soil amendment are obtained at 40 L/min. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13105, 2019

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Section: Resultsmentioning

confidence: 96%

Effects of wood biomass type and airflow rate on fuel and soil amendment properties of biochar produced in a top‐lit updraft gasifier

Díez

Pérez

2018

Env Prog and Sustain Energy

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“…To observe the effect of the torrefaction process on the heating value of biomass, the lower heating value (LHV) was used in this study. The LHV is calculated by the correlation presented in Díez and Pérez (2017), LHVdb=HHVdb-2260 Mdb -20300Hdb, where HHVdb (kJ/kg) is the higher heating value on dry basis, Mdb is the moisture content of the sample (%dry basis), and Hdb is the hydrogen (% dry basis).…”

Section: Lower Heating Valuementioning

confidence: 99%

“…FVI was related to important properties, such as the heating value, bulk density, and ash and moisture contents (Purohit and Nautiyal 1987;Cuvilas 2015;Ojelel et al 2015). The FVI is a more accurate volumetric energy density, because it quantifies the effect of the moisture and ash contents on the energy density of biomass (Díez and Pérez 2017 Figure 2 shows the mass yield of patula pine for the different torrefaction conditions. For torrefied material at 180 °C, the mass yield was approximately 88%, regardless of the residence time of the experiment.…”

Section: Fuel Value Indexmentioning

confidence: 99%

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Physicochemical Characterization of Torrefied Wood Biomass under Air as Oxidizing Atmosphere

Ramos-Carmona¹,

Delgado-Balcázar²,

Pérez³

2017

BioResources

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The effects of torrefaction under an oxidizing atmosphere on the physicochemical properties of patula pine wood chips were studied. Raw and torrefied pine were characterized to evaluate the effect of temperature and residence time on biofuel properties, such as bulk density, equivalent Hardgrove grindability index (HGIeq), ultimate and proximate analyses, heating value, and fuel value index (FVI). In contrast, the torrefaction process was characterized by mass and energy yields, and by the energymass co-benefit index (EMCI). Torrefaction was performed in a rotary kiln at temperatures between 180 °C and 240 °C during residence times between 30 min and 120 min. The torrefaction process under an oxidizing atmosphere tended to increase the fixed carbon/volatile matter ratio (from 0.19 to 2.5), while the H/C and O/C atomic ratios decreased 73% and 55%, respectively. The best properties of wood reached in the experimental plan were obtained at 210 °C during 75 min. For this torrefaction condition, energy yield, FVI, and EMCI were 85.91%, 1.91 MJ/cm 3 , and 4.41%, respectively. Additionally, the lower heating value for torrefied pine (18.65 MJ/kg) was higher than for the raw material (17.76 MJ/kg), and the HGIeq was 17% greater, which resulted in a better grindability behavior.

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“…Biomass is a source of renewable energy that has great potential to reduce our dependence on fossil fuels, mainly due to its highly decentralized availability (Martínez et al 2012;Díez and Pérez 2017). Biomass can be converted to solid, liquid, and gaseous products, which are useful to other thermochemical or industrial processes (Puig-Arnavat et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Effect of Torrefied Wood Biomass under an Oxidizing Environment in a Downdraft Gasification Process

Ramos-Carmona

Pérez

2017

BioResources

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The effect of composition and heating value of torrefied biomass under an oxidizing atmosphere at different conditions (180, 210, and 240 °C during 30, 75, and 120 minutes) was studied relative to downdraft gasification performance. An extended model for gasification in thermochemical equilibrium was used to evaluate the effect of pretreated biomasses, fuelto-air equivalence ratio, and char byproduct production on the producer gas composition, reaction temperature, cold gas efficiency (CGE), and the engine fuel quality (EFQ). The model was validated with experimental data, reaching a global relative error of 8.5%. For raw or torrefied biomasses, with regard to char production, the CGE decreases if char increases; this is due to the fact that the process tends to combustion regimes when a lower amount of carbon is involved in the gasification reaction. Otherwise, the CGE and EFQ increase (up to 80% and 2.5 MJ/kg, respectively) if fuel-to-air ratio increases. With regard to the torrefied biomass, it is highlighted that CGE and EFQ increase from 77% to 82% and from 2.2 MJ/kg to 2.5 MJ/kg, respectively, when the torrefaction conditions (temperature and/or time) increase. This behavior is related to the increase of the autothermal zones in the gasification process and due to the higher heating value of torrefied biomass.

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Physicochemical Characterization of Representative Firewood Species Used for Cooking in Some Colombian Regions

Cited by 31 publications

References 48 publications

Effects of wood biomass type and airflow rate on fuel and soil amendment properties of biochar produced in a top‐lit updraft gasifier

Effects of wood biomass type and airflow rate on fuel and soil amendment properties of biochar produced in a top‐lit updraft gasifier

Physicochemical Characterization of Torrefied Wood Biomass under Air as Oxidizing Atmosphere

Effect of Torrefied Wood Biomass under an Oxidizing Environment in a Downdraft Gasification Process

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