196,251 research outputs found
Plastic-to-oil plant, according cracking reactor, and related methods for converting plastic waste into petrochemical products
No full textA feasibility assessment of an integrated plastic waste system adopting mechanical and thermochemical conversion processes
No full textThe large variety and amounts of plastic waste produced worldwide requires to better organize the industrial network devoted to the exploitation of this material by including different processes that allow to recover the “material” as main target. This paper presents the results of the feasibility study developed for an integrated system for plastic waste management designed in such a way to deal with the real market and provide for reliable targets in term of material recovery yields, energy efficiency and waste minimization. The system under study is a combination of mechanical sorting, thermochemical processes and conversion into materials and energy. The quantified block diagrams are used to represent the mass and feedstock energy balances by allowing the calculation of yields of given products. The equipment list for each sub-system is provided together with the installed power for the main component and/or auxiliary; these data allowed to perform the energy balance and to obtain the net energy production by the integrated system. The energy balance demonstrated that the integrated system is feasible while, on the contrary, the single processes are not energetic self-sustainable
Tar removal during the fluidized bed gasification of plastic waste
No full textA recycled polyethylene was fed in a pilot plant bubbling fluidized bed gasifier, having an internal diameter of 0.381 m and a maximum feeding capacity of 90 kg/h. The experimental runs were carried out under various operating conditions: the bed temperature was kept at about 850 °C, the equivalence ratio varied between 0.2 and 0.35, the amount of bed material was between 131 and 215 kg, the fluidizing velocity was between 0.5 and 0.7 m/s, quartz sand and olivine were used as bed material, and air and steam were used as fluidizing reactants. The results confirm that the tar removal treatments applied inside the gasifier (primary methods) can eliminate or strongly reduce the need for a further downstream cleanup of the syngas. In particular, the utilization of a natural olivine as an in situ tar reduction agent remarkably improves the quality of the product gas, in terms of both high hydrogen volumetric fraction and larger syngas yield. © 2008 Elsevier Ltd. All rights reserved
Recensione a: M. GUILLAUMONT, Philosophe et augure. Recherches sur la théorie cicéronienne de la divination, "Coll. Latomus", vol. 184, Bruxelles 1984, pp. 212
No full textRecensione a: M. GIOSEFFI, Studi sul commento a Virgilio dello Pseudo-Probo, Pubbl. della Fac. di Lett. e Filos. dell'Univ. di Milano, sez. a cura dell'Ist. di Filol. Class., 3, La Nuova Italia ed., Firenze 1991, pp. VII- 348
No full textRecensione a: I testi di medicina latini antichi. Problemi filologici e storici, Atti del I Convegno internazionale (Macerata-S. Severino M., 26-28 aprile 1984), a cura di I. MAZZINI e Franca FUSCO, G. Bretschneider ed., Roma 1985, pp. 446
No full textRecensione a: AA. VV., La cultura classica a Napoli nell'Ottocento (Premessa di M. Gigante), Pubbl. del Dip. di Filol. Class. dell'Univ. degli St. di Napoli, Napoli 1987, 2 voll., pp. 973
No full textGasification of Recycled Plastic Waste in a Fluidized Bed Reactor: Effect of Operating Conditions
No full textThe effect of particle size and density on solids distribution along the riser of a circulating fluidized bed
No full textA cold model of a CFB having a 0.120 m-ID and 5.75 m-high riser, was operated under a relatively wide range of gas velocity and solids mass flux. Four solids (two Ballotini, a silica sand and a spent FCC), belonging to groups A and B of Geldart's classification, were selected in order to separately investigate the effect of particle size and density on axial profiles of voidage and on radial profiles of solids mass flux. Attention was focused, in particular, on the suspension density at the bottom and exit regions of the riser
Design of mitigation systems for indoor and outdoor ammonia releases
No full textThe paper describes the design of two mitigation systems adopted by an important food company, which uses ammonia for its refrigeration plant. The results of an accurate risk analysis identified the critical risk areas and the alternative mitigation systems. Two different approaches were used for indoor and outdoor accidents. A specific model was developed to estimate the time concentration of ammonia profile after a release inside an enclosure. It was used to minimise the amount of releasable ammonia by the insertion of automatic valve devices along the pipe containing pressurized ammonia. The approach for outdoor accidents led to the design of a fluid curtain capable of intercepting and absorbing the released ammonia cloud. Another specific model, which takes into account the two-phase character of an ammonia cloud, was devised in order to calculate the water flow rate needed to ensure adequate absorption efficiency. © 2003 Elsevier Science Ltd. All rights reserved
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