Unconventional biomass fuels for steam gasification: Kinetic analysis and effect of ash composition on reactivity

González-Vázquez, M.P.; García, Roberto; Gil, M.V.; Pevida, C.; Rubiera, F.

doi:10.1016/j.energy.2018.04.188

Cited by 56 publications

(25 citation statements)

References 42 publications

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“…When the severity factor increases, VM content decreases from 85.87% to 40.43% corresponding to OTP and the most severe treatment (280_9), respectively. These values are in agreement with other works [12,43]. This decrease in VM implies an increase in FC of the solid phase as the severity increases.…”

Section: Chemical Analysis and Higher Heating Value Of The Solid Phasesupporting

confidence: 93%

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Hydrothermal Carbonization of Olive Tree Pruning as a Sustainable Way for Improving Biomass Energy Potential: Effect of Reaction Parameters on Fuel Properties

et al. 2020

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Hydrothermal carbonization (HTC) allows the conversion of organic waste into a solid product called hydrochar with improved fuel properties. Olive tree pruning biomass (OTP), a very abundant residue in Mediterranean countries, was treated by HTC to obtain a solid fuel similar to coal that could be used in co-combustion processes. Three different reaction temperatures (220, 250, and 280 °C) and reaction times (3, 6, and 9 h) were selected. The hydrochars obtained were extensively analyzed to study their behavior as fuel (i.e., ultimate, proximate, fiber and thermogravimetric analysis, Fourier-transform infrared spectroscopy (FTIR), activation energy, and combustion performance). The concentrations of cellulose, hemicellulose, and lignin in the samples depict a clear and consistent trend with the chemical reactions carried out in this treatment. Regarding O/C and H/C ratios and HHV, the hydrochars generated at more severe conditions are similar to lignite coal, reaching values of HHV up to 29.6 MJ kg−1. The higher stability of the solid is reflected by the increase of the activation energy (≈60 kJ mol−1), and ignition temperatures close to 400 °C. With this, HTC is a proper thermal treatment for the management of raw OTP biomass and its further conversion into a solid biofuel.

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Section: Chemical Analysis and Higher Heating Value Of The Solid Phasesupporting

confidence: 93%

“…The ultimate analysis showed similar results to other lignocellulosic wastes, such as poplar wood, hazelnut shell, olive stone, or coffee husk [31,43,45]. OTP was mainly composed of carbon and oxygen, with a low nitrogen content and a negligible sulphur content.…”

Section: Chemical Analysis and Higher Heating Value Of The Solid Phasesupporting

confidence: 66%

Hydrothermal Carbonization of Olive Tree Pruning as a Sustainable Way for Improving Biomass Energy Potential: Effect of Reaction Parameters on Fuel Properties

et al. 2020

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“…This catalytic effect has also been reported in several other gasification studies in the literature [35,[37][38][39]. In contrast, CHE had a low reactivity, which was attributed to its very high Ca content [36]. P ash content has been reported to have an inhibiting effect on the gasification reaction in literature [37,38], which has not been shown in the present study since the CS biomass had the highest gasification reactivity and the highest P2O5 ash content, as shown by the location of this variable in the PCA plots.…”

Section: Some Of the Variables Associated With The Pc2 Component Sucsupporting

confidence: 84%

“…In fact, differences in reactivity between biomass samples have been commonly attributed to the presence of catalytic alkaline and alkaline-earth metals [33][34][35]. In a previous work by our research group on the kinetic analysis of the gasification process [36], the steam gasification reactivity of some of the biomass samples studied was measured by means of a reactivity index at 900 ºC, and a positive effect of the K ash content, but negative effects of the Ca ash contents, upon reactivity were detected. Thus, CS sample showed the highest reactivity value, followed by sample GP.…”

Section: Some Of the Variables Associated With The Pc2 Component Sucmentioning

confidence: 99%

Assessing the influence of biomass properties on the gasification process using multivariate data analysis

Gil

González-Vázquez

García

et al. 2019

Energy Conversion and Management

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Multivariate analysis was used to study the influence of the biomass characteristics on the gasification process. Ten lignocellulosic biomass samples (almond shells-AS-, chestnut sawdust-CHE-, torrefied chestnut sawdust-CHET-, cocoa shells-CS-, grape pomace-GP-, olive stones-OS-, pine cone leafs-PCL-, pine sawdust-PIN-, torrefied pine sawdust-PINT-, and pine kernel shells-PKS-) were gasified in a bubbling fluidized bed gasifier under an air-steam atmosphere. Statistical analysis was applied to the variables that described the results of the gasification process, i.e., gas concentration, gas production (moles), calorific value of the product gas, energy density, and cold gas efficiency, together with the main biomass properties, such as those derived from the elemental and proximate analyses, the higher heating value (HHV), the particle density, and the elemental composition of the ashes. Hierarchical cluster analysis (HCA) and principal component analysis (PCA) were applied to the data of biomass properties and gasification parameters in order to elucidate which feedstock features had a more determinant influence on the gasification process. Both HCA and PCA revealed a clear separation of the biomass samples into two main groups on the basis of the gasification results. The results indicated that PKS, PCL, PINT, OS and PIN biomasses were characterized by high production of combustible gases, such as CO and CH4, high conversion and cold gas efficiency during gasification. This indicated that the most important biomass properties for promoting the gas production, calorific value of the product gas, gasification conversion and energy efficiency were the C and H contents and the HHV of the biomass. However, biomasses CS and GP were mainly characterized by high H2 concentration and H2/CO molar ratio in the gas product, which was mainly related to the higher H/O ratio and K2O ash content of the biomass. The H2 concentration in the product gas was negatively

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“…The differences of NG ash properties in the current study as compared to the literature were due to the fact that the trees were dependent on growth conditions and other environmental factors. The ash composition has a negative effect on the gasification performance reactor when subjected to high temperature combustion [24].…”

Section: Proximate and Ultimate Analysis Of Napier Grass Feedstockmentioning

confidence: 99%

Thermochemical Conversion of Napier Grass for Production of Renewable Syngas

et al. 2019

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Fuel resource diversification is a global effort to deviate from non-renewable fossil fuels. Biomass has been identified as an alternative solid biofuel source due to its desirable properties and carbon neutrality. As reported in the literature, biomass can positively contribute towards combating climate change while providing alleviation for energy security issue. As part of efforts to diversify biomass resources, this work intends to explore the potential of Napier grass, one type of energy crop, for the production of renewable syngas via gasification. This energy crop is originally from Africa, which is highly productive with low cost (40 tonnes per year per hectare). Limited studies were conducted to analyze the potential of such an energy crop as a fuel source, which is the subject of this work. In order to analyze the full potential of such energy crop, the physical and chemical characteristics of this biomass was first analyzed. To determine the productivity of syngas from this biomass, fluidized bed gasifier was used in this work. The effects of gasification process parameters (i.e., equivalence ratio and temperature) on product yield and producer gas compositions were examined. Besides, the effects of equivalence ratio towards higher heating value of syngas and carbon conversion efficiency were analyzed. Based on the ultimate analysis results, the molecular formula of Napier gas was CH1.56O0.81N0.0043. Meanwhile, the higher heating value of such biomass was determined as 16.73 MJ/kg, which was comparable to other biomasses. It is noted that in this work, the volatile matter was determined as 85.52% and this promoted gasification process remarkably. The dynamics of the reactions involved were observed as a significant variation in product yield and biogas components were recorded at varying equivalence ratio and gasifier operating temperature.

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Unconventional biomass fuels for steam gasification: Kinetic analysis and effect of ash composition on reactivity

Cited by 56 publications

References 42 publications

Hydrothermal Carbonization of Olive Tree Pruning as a Sustainable Way for Improving Biomass Energy Potential: Effect of Reaction Parameters on Fuel Properties

Hydrothermal Carbonization of Olive Tree Pruning as a Sustainable Way for Improving Biomass Energy Potential: Effect of Reaction Parameters on Fuel Properties

Assessing the influence of biomass properties on the gasification process using multivariate data analysis

Thermochemical Conversion of Napier Grass for Production of Renewable Syngas

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