Pneumatic Transport
Mostrando 13-24 de 25 artigos, teses e dissertações.
-
13. Oxidation of zinc sulphide concentrate in a fluidised bed reactor - Part 1: Characterization of the fluid dynamics of the particle bed
The oxidation kinetics of a blend of zinc sulphide concentrates in a bench-scale fluidised bed reactor operated in batch regime was studied. This work involves the fluid dynamics characterisation of the bed during the reaction. Its purpose is to determine bed behaviour and to assess the experimental conditions used in the roasting experiments. The characteri
Brazilian Journal of Chemical Engineering. Publicado em: 2005-03
-
14. Improving the power consumption in pneumatic conveying systems by a daptive control of the flow regime
The pneumatic conveying of solids in a gas stream is a recurrent process in petrochemical industries. However, due to practical limitations the majority of existing systems have capacities ranging from 1 to 400 tones per hour over distances less than 1000 m, mainly because of a high power consumption per transported unit mass. More specifically, to avoid the
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-12
-
15. The effects of geometry and operational conditions on gas holdup, liquid circulation and mass transfer in an airlift reactor
In airlift reactors transport phenomena are achieved by pneumatic agitation and circulation occurs in a defined cyclic pattern through a loop. In the present work, the effect of geometrical relations on gas holdup and liquid velocity, and consequently on the gas-liquid mass transfer coefficient, was studied in a 6-liter airlift bioreactor with A D/A R = 0.63
Brazilian Journal of Chemical Engineering. Publicado em: 2003-10
-
16. Vertical pneumatic conveying in dilute and dense-phase flows: experimental study of the influence of particle density and diameter on fluid dynamic behavior
In this work, the effects of particle size and density on the fluid dynamic behavior of vertical gas-solid transport of Group D particles in a 53.4 mm diameter transport tube were studied. For the conditions tested, the experimental curves of pressure gradient versus air velocity presented a minimum pressure gradient point, which is associated with a change
Brazilian Journal of Chemical Engineering. Publicado em: 2001-09
-
17. Combinación de sistemas de flujo de baja y alta presion para la determinacion de Mg, Ca y Sr en salmueras por espectrofotometria de absorcion atomica con llama
This article describes the combination of low- and high-pressure flow systems for the determination of Magnesium, Calcium and Strontium by flame atomic absorption spectrometry (FAAS). In the low-pressure system a short C-18 RP column (length 0,5 cm) was utilized for the preconcentration/matrix separation step, xylenol orange was used as chelating agent and t
Química Nova. Publicado em: 2001-04
-
18. Estudo experimental de uma valvula conica para controle da descarga de solidos em leito fluidizado
Feed valve are essential devices in gas-solid systems, in process as fluidized bed drying, pneumatic transport, coal combustion, biomass gasification and synthesis reactions in fluidized beds. All require a feed valve for the particulate solid to control the mass flow rate entering andlor leaving the processo. This work presents the development and the exper
Publicado em: 2001
-
19. Simulação orientada a objeto do transporte pneumatico
Particle transportation by a gas stream, commonly named as pneumatic conveying, has been ftequently used in a large variety of industrial processes. This is due not only to the diversity of materiais produced and handled in a granulated form, as also to the great number of possible applications of that operation, which includes since the simple displacement
Publicado em: 2000
-
20. Estudo de um secador com promotores estaticos anulares de mistura
A Continuous Vertical Annular Static Mixer Dryer was constructed and studied (Industrial Patent 8700583). The equipment consisted on a cylindrical drying column constructed in transparent acrylics, and a fan that blowed the ambient air, which was heated by a set of electrical heaters. The air flow rate was controlled by changing the admission area of the fan
Publicado em: 1996
-
21. Estudo da fluidodinamica e da troca termica gas-solidos no transporte pneumatico vertical ascendente de misturas de particulas solidas
The objective of this work was to study the effect of the particle size distribution on the fluid dynamic and fluid-to-particle heat transfer in ascendent vertical pneumatic transport...Note: The complete abstract is available with the full electronic digital thesis or dissertations
Publicado em: 1993
-
22. Transporte unitario de grãos agricolas por processo pneumatico, em dutos de pequeno diametro
This research work is fundamentally related to the development of the basics of grain fluidic distributers in which single grains are pumped along small dia,meters tubes. The model is based upon pneumatic transport theory envolving variables of interest such density, sife and form of grain, velocity an air pressure. As expected, the analysis is very complexo
Publicado em: 1991
-
23. Coeficientes locais de tranferencia de calor em leito fluidizado rapido
The main goal of this work was to study the heat transfer between a gas-solids mixture and the internal of a vertical pipe in which the mixture flows under condition of Fast Fluidization. The stainless steel pipe is 6m tall and has 0,072m of internal diameter. The superficial gas velocity was in the range of 5,8 m/s to 12,8 m/s and the solids flow rate varie
Publicado em: 1987
-
24. Transferencia de calor mistura-parede em leitos fluidizados recirculantes
This work involved the analysis of the influence of volumetric concentration, nature and size of solid particles on determining the convective heat transfer coeficient between solid-gas: mixtures and heated walls influidized beds with high air velocities and solids recirculation. The experimental results led to a correlation for predicting Nusselt Number as
Publicado em: 1986