Kinetic modelling of RDF pyrolysis: Model-fitting and model-free approaches

Çepelioğullar, Özge; Haykırı-Açma, H.; Yaman, Serdar

doi:10.1016/j.wasman.2015.11.027

Cited by 118 publications

(63 citation statements)

References 45 publications

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“…The The experimental drying data was tested to find the most suitable model among the above mentioned (3)(4)(5). The different constants in the considered models were determined using a linear regression procedure.…”

Section: Fig 1 Samples Of Rdf: A) Rdf1 B) Rdf0mentioning

confidence: 99%

Drying kinetics of RDF: Experimental investigation and modeling

2018

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Abstract. An experimental study was performed to determine the drying characteristics of an oversized fraction of RDF alternative fuel using a laboratory scale hot air dryer at a variety air temperatures and a constant air velocity. For this research the industrial RDF was derived from a Regional Municipal Waste Treatment Facility near the city of Kraków, Poland. The samples of RDF were prepared in two forms: ovesized (unmodified condition) and shreded in a two-drum crusher. In addition, the RDF was sorted into three groups of samples: paper, plastic, textiles. Each form of RDF and each group of samples were dried in hot air dryer at temperatures of 50, 70 i 90 °C and a constant air velocity of 1,5 [m·s]. The loss of the the samples mass were measured in a continues manner until the equilibrum moisture content was reached. The effective moisture diffusivity [m 2 ·s -1 ] and activation energies [kJ·mol -1 ] was amounted. The analysis of the course of moisture content change concludes that that the drying of the RDF alternative fuel occured mainly in the II period of the process during which the transport of water content was carried out by diffusion. And, to a lesser extent, with the surface heat transfer in II period. Based on the calculated data there was a model determined which presented the best possible matching of the course of moisture content change.

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Section: Fig 1 Samples Of Rdf: A) Rdf1 B) Rdf0mentioning

confidence: 99%

Drying kinetics of RDF: Experimental investigation and modeling

2018

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“…1a, it was evidently found that the whole process of thermal decomposition of FLs could be divided into three stages. To begin with, the first stage signified the removal of internal moisture and a small amount of volatile matter from the raw material (Çepelioğullar et al 2015;El-Sayed and Mostafa 2015). Thereafter, when the temperature approached 200 °C, the FLs underwent a second stage of thermal weight loss at all heating rates, where the hemicellulose and cellulose started to decompose.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Thermal and Kinetic Behaviors of Fallen Leaves and Waste Tires Using Thermogravimetric Analysis

et al. 2017

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Thermal decomposition characteristics and kinetic parameters of fallen leaves (FLs), waste tires (WTs), and their blends (1:1 weight ratio) were investigated. Pyrolysis experiments were conducted with four different heating rates of 5 °C/min, 10 °C/min, 20 °C/min, and 40 °C/min from 35 °C to 800 °C in a nitrogen atmosphere using a thermogravimetric analysis (TGA). The thermogravimetry/derivative thermogravimetry (TG/DTG) curves indicated that the three samples were mainly degraded in a wide temperature range of 350 °C to 450 °C, and that a greater weight loss rate corresponded to a higher heating rate. An elemental analysis demonstrated that FLs/WTs blends embraced a maximum calorific value that reached 25.24 MJ/kg. Two model-free methods, iso-conversional Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) were applied on the TGA data of samples to calculate the activation energies. The results showed that the average activation energies of the same feedstock based on KAS and FWO methods were approximately the same, with the highest error within 1.6%. Then, the activation energies obtained were introduced in the Coats/Redfern (CR) model-fitting method to derive the pre-exponential factors, based on first order rate of reaction.

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“…15 Additionally, the method has a capability to determine kinetic parameters exclusive of computing E a for each conversion value. 16 Currently, model free fitting method has been extensively used to examine the thermal degradation of various types of biomasses such as ramie residue, 17 sawdust, 17 cotton, 17 poplar wood 18 and chlorella vulgaris. 9 Thus, a series of non-isothermal experiments were carried out using model free fitting approach, where the weight of NG biomass samples was quantified as a function of temperature.…”

Section: Kinetic Study Of Ng Biomassmentioning

confidence: 99%