Co-gasification of Colombian coal and biomass in fluidized bed: An experimental study

Vélez, Jhon F.; Chejne, Farid; Valdés, Carlos F.; Emery, Eder J.; Londoño, Carlos

doi:10.1016/j.fuel.2008.10.018

Cited by 177 publications

(85 citation statements)

References 14 publications

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“…The average porosity was 64.20% for the long grain rice husk, 73.23% for the short grain rice husk, 70.45% for the cascara de arroz rice husk and 63.64% for the japonica rice husk. These values are similar to the value of 64.08% (calculated from the apparent density and real density) presented by Velez et al (2009) for the rice husk from Colombia but lower than the value of 75% reported by Subramanian et al (2011) for the rice husk from India, the values of 75.4-75.6% represented by Zhou et al (2009) and Fang et al (2004) for the rice husks from China and the values of 94.22-98.42% reported by Tirawanichakul et al (2008) for the rice husk from Thailand.…”

Section: Ajassupporting

confidence: 90%

“…The average bulk density was 377.24 kg m -3 for the long grain rice husk, 331.59 kg m −3 for the short grain rice husk, 344.97 kg m −3 for the cascara de arroz rice husk and 380.54 kg m −3 for the japonica rice husk. These values are similar to the value of 348.8 kg m −3 reported by Velez et al (2009) for the rice husk from Colombia, the value of 353 kg m -3 reported by Bishnoi et al (2004) for the rice husk from India and are within the range of 100-400 kg m −3 reported by Sridhar et al (1996) for the rice husk from India. reported by Yuan et al (2012) for the rice straw from China and the value of 182 kg m −3 reported by Chiueh et al (2012) for the rice straw from Taiwan and lower than the value of 227 kg m −3 reported by Kadam et al (2000) for the rice straw from USA.…”

Section: Rice Huskssupporting

confidence: 88%

“…The moisture content was 4.72% for the long grain rice husk, 5.63% for the short grain rice husk, 4.60% for the cascara de arroz rice husk and 6.07% for the japonica rice husk. These values are lower than the value of 8.1% reported by Subramanian et al (2011) for the rice husk from India, the value of 9.8% reported by Velez et al (2009) for the rice husk from Colombia, the value of 10.7% reported by Zhou et al (2009) for the rice husk from China, the values of 8.68-10.44% reported by Mansaray and Ghaly (1997) for the rice husks from Louisiana (USA) and Sierra Leone and the values of 9.8-10.7% reported by Casaca and Costa (2009) for the rice husks from Portugal. They are, however, higher than the value of 4.2% reported by Kalderis et al (2008) for the rice husk from India.…”

Section: Porositycontrasting

confidence: 65%

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Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Zhang

Ghaly

Li³

2012

American Journal of Applied Sciences

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Rice husk and straw are by-products of rice cultivation and processing industry and can be used as an energy source. Proper understanding of the physical properties of rice residues is necessary for utilizing them in thermochemical conversion processes such as gasification and combustion. The physical properties (moisture content, particle size, bulk density and porosity) of rice husks and straws obtained from three countries (Egypt, Cuba and China) were evaluated in this study. The moisture contents of rice husks and straws were in the ranges of 4.60-6.07% and 6.58-6.92%, respectively. For all rice varieties tested, the moisture content of the straws was higher than these of the husks. The particle sizes of rice husks and straws were in the ranges of 0.212-0.850 mm and 0-0.710 mm, respectively. All the rice husk varieties had a normal distribution of particle size around the main value of 0.6 mm while the particle size distribution for the rice straws showed a decreasing trend, the larger the particle size the higher was the weight percentage. The bulk density of rice husks and straws were in the ranges of 331.59-380.54 kg m -3 and 162. 03-194.48 kg m -3 , respectively. The bulk density values of rice straws were lower than those of rice husks. A negative linear relationship between the bulk density and the average particle size was observed for rice husks and straws. The porosity of rice husks and straws were in the ranges of 63.64-68.94% and 71.21-85.28%, respectively. A positive linear relationship between the porosity and the average particle size was observed for rice husks and straws. Also, a negative linear relationship between the porosity and the bulk density was observed. The results obtained from this study showed significant differences in the physical properties of the rice husks and straws collected from different countries (located in three different continents). These differences may be due to variations in climatic conditions, soil type, methods of cultivation and type of fertilizer used. The results also indicated that different parts of rice plant (straw and husk) had different physical properties. Also, significant differences were observed among rice varieties even though they were grown under the same climatic conditions using same soil type and cultivation method as in the case of the long and short grain rice variety of Egypt.

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Section: Ajassupporting

confidence: 90%

Section: Rice Huskssupporting

confidence: 88%

Section: Porositycontrasting

confidence: 65%

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Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Zhang

Ghaly

Li³

2012

American Journal of Applied Sciences

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“…Due to the fact that in a fixed-bed gasifier the different stages of biomass gasification occur in different zones, those gasifiers are the most appropriate to control some reactions and to produce certain desired species as required [10]. The oxidizer in gasification processes may be air [11], pure oxygen, pure steam [12], or blends of these [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The syngas produced in this study was blended with coal to run a cocombustor. In 2009, Vélez et al [14] carried out an experimental study on fluidizedbed cogasification of coal with biomass using a mixture of air-steam as oxidizing source. Blends of coal with 6%-15% of coffee husk (CH), rice husk (RH), and sawdust contents were used as feedstock.…”

Section: Introductionmentioning

confidence: 99%

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

Javier

Gordillo

2017

Journal of Combustion

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The increasing energy consumption, mostly supplied by fossil fuels, has motivated the research and development of alternative fuel technologies to decrease the humanity's dependence on fossil fuels, which leads to pollution of natural sources. Small-scale biomass gasification, using air-steam blends for partial oxidation, is a good alternative since biomass is a neutral carbon feedstock for sustainable energy generation. This research presents results obtained from an experimental study on coffee husk (CH) gasification, using air-steam blends for partial oxidation in a 10 kW fixed-bed gasifier. Parametric studies on equivalence ratio (ER) (1.53 < ER < 6.11) and steam-fuel (SF) ratio (0.23 < SF < 0.89) were carried out. The results show that increasing both SF and ER results in a syngas rich in CH 4 and H 2 but poor in CO. Also, decreased SF and ER decrease the peak temperature ( peak ) at the gasifier combustion zone. The syngas high heating value (HHV) ranged from 3112 kJ/SATPm 3 to 5085 kJ/SATPm 3 and its maximum value was obtained at SF = 0.87 and ER = 4.09. The dry basis molar concentrations of the species, produced under those operating conditions (1.53 < ER < 6.11 and 0.23 < SF < 0.89), were between 1.12 and 4.1% for CH 4 , between 7.77 and 13.49% for CO, and between 7.54 and 19.07% for H 2 . Other species were in trace amount.

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Gasification

2013

Coal‐Fired Power Generation Handbook

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Co-gasification of Colombian coal and biomass in fluidized bed: An experimental study

Cited by 177 publications

References 14 publications

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

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

Gasification

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