Fluidized bed combustion of residues from oranges’ plantations and processing

Vamvuka, Despina; Sfakiotakis, Stelios; Kotronakis, Manolis

doi:10.1016/j.renene.2012.01.083

Cited by 13 publications

(9 citation statements)

References 18 publications

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“…The inert bed material consisted of a Na–feldspar NaAlSi 3 O 8 with an average particle size of 421 μm. This has been found to diminish any bed agglomeration problems. ,− …”

Section: Methodsmentioning

confidence: 99%

Thermal Valorization of an Animal Sludge for Energy Recovery via Co-Combustion with Olive Kernel in a Fluidized Bed Unit: Optimization of Emissions

et al. 2016

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The thermal valorisation of an animal sludge was investigated through combustion and co-combustion experiments with an agricultural residue, olive kernel, in a fluidized bed unit. The performance of the fuels and their blends in terms of efficiency and emissions was tested under different operating conditions. The thermal behavior and the reactivity of the fuels as well as the distribution of product gases were provided by thermogravimetric−mass spectrometric experiments. The effects of excess air ratio, fuel loading, and blending ratio were examined, and a model was applied in order to provide optimal values of process variables for minimizing emission costs. During fluidized bed combustion, both fuels burned mostly within the bed with a high efficiency. CO emissions were low, SO 2 emissions were negligible, and NO x emissions of animal sludge were similar or lower than those of olive kernel. An increase in excess air or high fuel feeding increased CO and NO x levels. Cocombustion showed an additive behavior. The CO emissions of the mixtures were higher, whereas the NO x emissions were similar or lower than those produced from combustion of olive kernel. The model of emissions cost indicated that the optimum emission performance and cost were accomplished when the combustor was fed with a fuel mix of olive kernel−animal sludge 70/30 by weight, at a rate of 0.72 kg/h and excess air 30%.

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“…The inert bed material consisted of a Na–feldspar NaAlSi 3 O 8 with an average particle size of 421 μm. This has been found to diminish any bed agglomeration problems. ,− …”

Section: Methodsmentioning

confidence: 99%

Thermal Valorization of an Animal Sludge for Energy Recovery via Co-Combustion with Olive Kernel in a Fluidized Bed Unit: Optimization of Emissions

et al. 2016

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“…The authors also demonstrated that the mixture of apple pruning with pine residue produced pellets with higher energy density. Increasing the air–fuel ratio from 1.3 to 1.7 during combustion of orange tree prunings in a laboratory-scale fluidized bed reactor resulted in a decrease of the CO concentration in flue gas from 1600 mg/(Nm 3 ) to 700 mg/(Nm 3 ), whereas NOx concentration fluctuated at approximately 400 mg/(Nm 3 ) [ 23 ]. Application of a conical spouted bed for the combustion of fruit tree prunings allowed an increase in the efficiency of the process at lower temperatures, with simultaneous reduction of the amount of generated volatile organic compounds (VOC) generated in comparison with the absence of inert bed [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Pruning Residues from Various Types of Orchards and Pretreatment for Energetic Use of Biochar

et al. 2021

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The routine pruning and cutting of fruit trees provides a considerable amount of biowaste each year. This lignocellulosic biomass, mainly in the form of branches, trunks, rootstocks, and leaves, is a potential high-quality fuel, yet often is treated as waste. The results of a feasibility study on biochar production by pyrolysis of residues from orchard pruning were presented. Three types of biomass waste were selected as raw materials and were obtained from the most common fruit trees in Poland: apple (AP), pear (PR), and plum (PL) tree prunings. Two heating rates and three final pyrolysis temperatures were applied. For the slow (SP) and fast pyrolysis (FP) processes, the heating rates were 15 °C/min and 100 °C/min, respectively. The samples were heated from 25 °C up to 400, 500, and 600 °C. Chemical analyses of the raw materials were conducted, and the pyrolysis product yields were determined. A significant rise of higher heating value (HHV) was observed for the solid pyrolysis products, from approximately 23.45 MJ/kg for raw materials up to approximately 29.52 MJ/kg for pyrolysis products at 400 °C, and 30.53 MJ/kg for pyrolysis products at 600 °C. Higher carbon content was observed for materials obtained by fast pyrolysis conducted at higher temperatures.

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“…2 Waste stream management of olive crops seasonal pruning is an unneglectable issue considering that combustion is still the common disposal route. [3][4][5] During the past decades, the increase in accountability of CO 2 emissions has focused worldwide attention on alternative environmentally friendly biomasses conversion such as liquefaction, 6 gasification, 7 and pyrolysis. 8 Among the various thermochemical approaches, pyrolytic processes are the most versatile as they create platforms for the production of both biofuels and materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of pyrolytic thermal history on olive pruning biochar and related epoxy composites mechanical properties

Bartoli

Nasir

Jagdale

et al. 2019

Journal of Composite Materials

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Olive pruning is waste from olive cultivation and is generally disposed of through incineration. Olive pruning can, however, be salvaged by pyrolysis, which also produces an interesting carbon-based material known as biochar. Biochar has been proved as a suitable filler which improves the mechanical properties of epoxy composites. Despite this, literature has few studied focused on the relationship between biochar thermal history and the properties it induces in related biochar containing composites. In this work, we report a morphological analysis of biochar produced at different pyrolytic high treatment temperatures (400℃, 600℃, 800℃, and 1000℃) using different heating rates (5℃/min, 15℃/min, and 50℃/min). We investigate the effect of different biochar morphology on the biochar epoxy-related composites, proving the tuneability of the mechanical properties of composites according to the thermal history of the biochar employed.

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Fluidized bed combustion of residues from oranges’ plantations and processing

Cited by 13 publications

References 18 publications

Thermal Valorization of an Animal Sludge for Energy Recovery via Co-Combustion with Olive Kernel in a Fluidized Bed Unit: Optimization of Emissions

Thermal Valorization of an Animal Sludge for Energy Recovery via Co-Combustion with Olive Kernel in a Fluidized Bed Unit: Optimization of Emissions

Pyrolysis of Pruning Residues from Various Types of Orchards and Pretreatment for Energetic Use of Biochar

Influence of pyrolytic thermal history on olive pruning biochar and related epoxy composites mechanical properties

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