Thermogravimetric kinetic analysis of the combustion of biowastes

Sánchez, M.E.; Otero, Marta; Gómez, Xiomar; Morán, Antonio

doi:10.1016/j.renene.2008.11.011

Cited by 108 publications

(69 citation statements)

References 42 publications

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“…In this study, the methane yields were assumed to be 250-320 m 3 /tTS for grass (Lehtomäki, 2006), 379-454 m 3 /tTS for biowaste (Lehtomäki et al, 2007) and 232-412 m 3 /tTS for sewage sludge (Ward et al, 2008;Lehtomäki et al, 2007). The lower heating value of the dry material (LHVd) of the feedstock was assumed to be 15-21.7 MJ/kg for sewage sludge (Houdková et al, 2008;Metcalf and Eddy, 2003), 12.5-18.6 MJ/kg for biowaste (Tchobanoglous et al, 1993;Sanchez et al, 2009) and 17.3 MJ/kg for grass (Nizami et al, 2009). …”

Section: Kymen Bioenergy Biogas Plantmentioning

confidence: 99%

Evaluation of methods for estimating energy performance of biogas production

et al. 2014

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This study focused on identifying various system boundaries and evaluating methods of estimating energy performance of biogas production. First, the output-input ratio method used for evaluating energy performance from the system boundaries was reviewed. Secondly, ways to assess the efficiency of biogas use and parasitic energy demand were investigated. Thirdly, an approach for comparing biogas production to other energy production methods was evaluated. Data from an existing biogas plant, located in Finland, was used for the evaluation of the methods. The results indicate that calculating and comparing the output-input ratios (Rpr1, Rpr2, Rut, Rpl and Rsy) can be used in evaluating the performance of biogas production system. In addition, the parasitic energy demand calculations (w) and the efficiency of utilizing produced biogas (η) provide detailed information on energy performance of the biogas plant. Furthermore, Rf and energy output in relation to total solid mass of feedstock (FO/TS) are useful in comparing biogas production with other energy recovery technologies. As a conclusion it is essential for the comparability of biogas plants that their energy performance would be calculated in a more consistent manner in the future.

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Section: Kymen Bioenergy Biogas Plantmentioning

confidence: 99%

Evaluation of methods for estimating energy performance of biogas production

et al. 2014

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“…Samples of 10 mg each were analyzed in the TGA starting from room temperature to 850°C under an air flow. Four different heating rates, β, of 10 Kmin -1 , 20 Kmin -1 , 30 Kmin -1 , and 40 Kmin -1 were chosen based on their suitability in homogeneous ignition and to minimize heat mass transfer effects as suggested by Sanchez et al [9]. One key feature of the TGA is its ability to determine the solid state reactions in a combustion process for which the mathematical descriptions are commonly defined in terms of their kinetic parameters, activation energy, E, and the Arrhenius parameter, A.…”

Section: Methodsmentioning

confidence: 99%

“…One key feature of the TGA is its ability to determine the solid state reactions in a combustion process for which the mathematical descriptions are commonly defined in terms of their kinetic parameters, activation energy, E, and the Arrhenius parameter, A. An algebraic expression of the kinetic model for the solid state reactions related to the experimental data were previously proposed by many resources [3], [4], [9], [10], [13], as a function of the fractional conversion α, whereby f (α) can be written as:…”

Section: Methodsmentioning

confidence: 99%

“…(1) [9], [10] .The iso-conversional method is more widely used compared to the fitting models as it provides the ability to compute kinetic parameters without prefixing the reaction order [4], [10], [14].. In contrast, the model-fitting kinetic method generally involves the use of a single heating rate, which will result in a variation of activation energy values due to mass and heat transfer effects [9] . In the model free method the rate of heterogeneous solidstate reactions described in Eq.…”

Section: -P2mentioning

confidence: 99%

“…Khan et al [8] reported the activation energy, pre-exponential factor and order of reaction for a temperature range between 50 and 900°C using a heating rate of 20 °C/min. Other related studies investigated the cocombustion of sewage sludge with coal using TGA [3], [4], [6], [9]- [11]. In these studies, a wide range of variation in the values of the kinetic parameters and the TGA DTG characteristics were observed for sewage sludge.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Non-isothermal Thermogravimetric Kinetic Analysis of Malaysian Sewage Sludge

Abbas

Aris

Sulaiman

et al. 2014

MATEC Web of Conferences

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Abstract. Dewatered sewage sludge is one of the largest contributors of waste material in Malaysia and it indirectly elevates local environmental problems. Previous studies have indicated sewage sludge as a potential alternative fuel based on its higher heating values. To explore sewage sludge as an alternative solid fuel will not only address energy demand issues, it will also mitigate long term disposal problems related with the waste material. Further information on combustion characteristics of this material is required before any links to power generation applications can be established. In this work the combustion characteristics of Malaysian sewage sludge was studied by means of thermogravimetric analysis (TGA) under different heating rates (10, 20 30 and 40 K/min). Non-isothermal thermogravimetric data were used to assess the kinetics of the combustion of sewage sludge by the application of Ozawa-Flynn-Wall and Vyazovkin kinetic models. The average activation energies were found to be 82 and 79 kJ/ mol respectively. The average reaction order corresponding to sewage sludge combustion was 0.11.

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Fluid Dynamics of a Sand‐Biomass Mixture in a Spouted‐Bed Reactor for Fast Pyrolysis

et al. 2013

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The spouted-bed reactor represents an interesting alternative to pyrolysis as compared with conventional fluid beds due to its better performance in handling coarse and irregular materials, requiring lower fluidizing flow rates and providing intense thermal contact. The fluid dynamics of a mixture of sand and sugarcane bagasse in a spouted bed was investigated. Since this process involves a mixture of solids of different sizes, shapes, and densities, particle segregation was also analyzed. The results provided significant insights about the segregation phenomenon which may cause severe operating problems during pyrolysis. Various mixture compositions were identified in which the particles exhibited good circulation in the bed.

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Thermogravimetric kinetic analysis of the combustion of biowastes

Cited by 108 publications

References 42 publications

Evaluation of methods for estimating energy performance of biogas production

Evaluation of methods for estimating energy performance of biogas production

A Non-isothermal Thermogravimetric Kinetic Analysis of Malaysian Sewage Sludge

Fluid Dynamics of a Sand‐Biomass Mixture in a Spouted‐Bed Reactor for Fast Pyrolysis

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