Low temperature gasification of olive kernels in a 5-kW fluidized bed reactor for H2-rich producer gas

Skoulou, Vasiliki; Koufodimos, G.; Samaras, Zissis; Zabaniotou, Α.

doi:10.1016/j.ijhydene.2008.07.074

Cited by 102 publications

(39 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of this, an SR range between 0.1-0.4 and a medium-high S/A ratio (50/50, 75/25), i.e., a SBR from 0.24 to 4.69, were selected for the rest of the experiments. These ranges are reasonably similar to the ones commonly reported in the literature [12,15,38]. …”

Section: Preliminary Selection Of Operation Conditionssupporting

confidence: 90%

Optimization of a Bubbling Fluidized Bed Plant for Low-Temperature Gasification of Biomass

et al. 2017

View full text Add to dashboard Cite

Investigation into clean energies has been focused on finding an alternative to fossil fuels in order to reduce global warming while at the same time satisfying the world's energy needs. Biomass gasification is seen as a promising thermochemical conversion technology as it allows useful gaseous products to be obtained from low-energy-density solid fuels. Air-steam mixtures are the most commonly used gasification agents. The gasification performances of several biomass samples and their mixtures were compared. One softwood (pine) and one hardwood (chestnut), their torrefied counterparts, and other Spanish-based biomass wastes such as almond shell, olive stone, grape and olive pomaces or cocoa shell were tested, and their behaviors at several different stoichiometric ratios (SR) and steam/air ratios (S/A) were compared. The optimum SR was found to be in the 0.2-0.3 range for S/A = 75/25. At these conditions a syngas stream with 35% of H 2 + CO and a gas yield of 2 L gas/g fuel were obtained, which represents a cold-gas efficiency of almost 50%. The torrefaction process does not significantly affect the quality of the product syngas. Some of the obtained chars were analyzed to assess their use as precursors for catalysts, combustion fuel or for agricultural purposes such as soil amendment.

show abstract

Section: Preliminary Selection Of Operation Conditionssupporting

confidence: 90%

Optimization of a Bubbling Fluidized Bed Plant for Low-Temperature Gasification of Biomass

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Carbon monoxide values (8.5% on average) were also slightly lower than the values obtained in other studies (Parthasarathy and Sheeba, 2015). In the same line, the results obtained for CO 2 and CH 4 were also lower than those reported in different works studying the gasification of other lingo-cellulosic raw materials (Skoulou et al, 2008;Weerachanchai et al, 2009).…”

Section: Gasification and Combustioncontrasting

confidence: 50%

Improving sustainability in the remediation of contaminated soils by the use of compost and energy valorization by Paulownia fortunei

Madejón

Domínguez

Díaz

et al. 2016

Science of The Total Environment

View full text Add to dashboard Cite

The plantation of fast growing trees in contaminated sites, in combination with the use of organic wastes, could partially solve a dual environmental problem: the disposal of these wastes and the improvement of soil quality in these degraded soils. This study evaluated the effects of two composts amendments on the quantity and quality of Paulownia fortunei biomass and on syngas production by biomass gasification, produced by plants growing on trace elements contaminated soils. Compost increased biomass production to values similar to those produced in non-contaminated soils, due to the improvement in plant nutritional status. Moreover, biomass quality for gasification was increased by compost addition. Trace element accumulation in the biomass was relatively low and not related to biomass production or the gas quality obtained through gasification. Thus, P. fortunei plantations could pose an opportunity to Preprint submitted to Elsevier 2 improve the economic balance of the revegetation of contaminated soils, given that other commercial uses such as food or fodder crop production is not recommended in these soils.

show abstract

“…At higher temperatures, the gas generated from biomass in the pyrolysis zone could undergo further reactions (secondary reactions) such as tar cracking, as described by reaction R2, which leads to an increase in CH 4 concentration with bed temperature. Skoulou et al [43] demonstrated that methane was generally produced at low concentration (CH 4 < 5 vol%) under all test conditions from olive kernels in a fluidized bed reactor and they explained that methane was reforming at higher temperatures due to reaction R2. The same result was obtained by Mohammed et al [44] and Lucas et al [45].…”

Section: Effect Of Bed Reactor Temperature On the Gas Yieldmentioning

confidence: 99%

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Al-Farraji

Marsh

Steer

et al. 2017

Waste Biomass Valor

View full text Add to dashboard Cite

This paper is an experimental study of the kinetics of gasification of olive kernel by using a thermogravimetric fluidized bed reactor technique. Gasification of 'as received' and torrefied olive kernels were investigated in a lab-scale bubbling fluidized bed gasifier, operating at up to 3.2 kg/h. The effect of bed temperature between 550 and 750 °C in 50 °C increments on the gasification product gas at mass-based equivalence ratios of 0.15 and 0.2 was studied. To explore the potential of torrefied biomass, the gasification results were compared to that of the 'as received' biomass. The product gas from torrefied biomass produced higher H 2 , CO and CH 4 concentrations at identical oxidant flow rates in addition to higher cold gas efficiency and higher product gas heating value. The influence of equivalence ratio in gasification was also investigated at reactor temperatures of 750 °C and five equivalence ratios (0.15, 0.2, 0.25, 0.3, and 0.35). The results revealed that the torrefied biomass has the highest HHV at an equivalence ratio of 0.2 with a value of 6.09 MJ/Nm 3 , while 'as received' biomass 4.72 MJ/Nm 3 . Kinetic experiments under isothermal conditions were performed for the gasification of the materials in continuous mode. A mass balance model was successfully used to provide the capability of separately determining the rate constant of the reactions taking place. The kinetic parameters were calculated by a first order reaction model giving activation energies for 'as received' olive kernels of 84 kJ/mol and for torrefied olive kernels of 106 kJ/mol.

show abstract

Low temperature gasification of olive kernels in a 5-kW fluidized bed reactor for H2-rich producer gas

Cited by 102 publications

References 28 publications

Optimization of a Bubbling Fluidized Bed Plant for Low-Temperature Gasification of Biomass

Optimization of a Bubbling Fluidized Bed Plant for Low-Temperature Gasification of Biomass

Improving sustainability in the remediation of contaminated soils by the use of compost and energy valorization by Paulownia fortunei

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Contact Info

Product

Resources

About