6 documents found, page 1 of 1
Chemical composition, morphology, antioxidant, and fuel properties of pine nut ...
Sen, Ali Umut; Correia, Ricardo; Longo, Andrei; Nobre, Catarina; Alves, Octávio; Santos, Margarida; Gonçalves, Margarida; Miranda, IsabelPine nut shells are waste lignocellulosic residues from the production of edible pine nut kernels that are generally only used for energy production by combustion. Lignocellulosic feedstocks, such as pine nut shells, may be valorized namely by their integration into biorefinery schemes. This article set out to analyze the chemical composition, morphology, antioxidant, and fuel properties of pine nut shells from...
Characterization of hydrochar and process water from the hydrothermal carboniza...
Nobre, Catarina; Alves, Octávio; Durão, Luís; Sen, Ali; Vilarinho, Cândida; Gonçalves, MargaridaIn this study, hydrothermal carbonization (HTC) was used as a thermochemical conversion process to upgrade Refuse Derived Fuel (RDF). The effect of process temperature (250 °C, 275 °C and 300 °C), residence time (30 min and 120 min), and RDF-to-water ratio (1:15 and 1:5) on the main characteristics of the produced hydrochars and process waters was assessed. The HTC process yielded hydrochars with enhanced fuel ...
Characterization of Municipal, Construction and Demolition Wastes for Energy Pr...
Alves, Octávio; Passos, Jeysa; Brito, Paulo; Gonçalves, Margarida; Monteiro, EliseuGasification of wastes is considered a promising alternative for energy generation due to its lower environmental impacts when compared with conventional landfilling and incineration. Valorisation of such wastes improves sustainability of resource management and of energy production. However, an appropriate characterisation of wastes in terms of physical and chemical properties is essential for the prediction o...
Upgrading of refuse derived fuel through torrefaction and carbonization: evalua...
Nobre, Catarina; Vilarinho, Cândida; Alves, Octávio; Mendes, Benilde; Gonçalves, MargaridaRefuse derived fuel (RDF) is produced in large amounts but its heterogeneous nature and low calorific value reduce the potential for energetic valorization of this material. In this work, the torrefaction and carbonization of RDF was studied in a temperature range of 200–400 °C and residence times from 15 to 60 min, yielding chars with increased density, high heating value (HHV), carbon content, ash content and...
A Heuristic Solution Based on Clarke & Wright's Savings Algorithm for the Optim...
Passos, Jeysa; Lourinho, Gonçalo; Alves, Octávio; Brito, PauloSewage sludge originating from wastewater treatment plants (WWTPs) can be a major cause of environmental pollution and their appropriate management should be viewed as a priority. A critical aspect in sludge management practices is route optimization since significant costs are associated with the transportation of waste. In this work, we propose a heuristic solution based on Clarke-Wright savings method for th...
Modelling higher heating value of different separated fractions from municipal ...
Alves, Octávio; Gonçalves, Margarida; Brito, Paulo; Monteiro, EliseuHigher heating value (HHV) is an important property of biomass and wastes used to evaluate their potential conversion to useful thermal or electric energy. Because the measurement of this property requires expensive resources and is somewhat time-consuming, many works focused their attention on the determination of mathematic models relating the HHV with the composition of lignocellulosic biomass or other fuel ...