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Sunday, July 19, 2020 | History

2 edition of Gas-solids intenaction in the zone of a fluidized-bed found in the catalog.

Gas-solids intenaction in the zone of a fluidized-bed

Donald J Kirwan

Gas-solids intenaction in the zone of a fluidized-bed

phase I ...

by Donald J Kirwan

  • 202 Want to read
  • 25 Currently reading

Published by Energy Research and Development Administration, for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English

    Subjects:
  • Fluidized-bed furnaces,
  • Fluidization

  • Edition Notes

    StatementDonald J. Kirwan, Sterling Vines
    ContributionsVines, Sterling, joint author, United States. Energy Research and Development Administration
    The Physical Object
    Paginationv. :
    ID Numbers
    Open LibraryOL17968779M

      This process uses highly active and selective catalysts, resulting in an enormous local heat production rate, which needs to be removed from the reaction zone in the fluidized bed reactor. Despite the excellent heat transfer inside a fluidized bed, the heat removal rate is the limiting factor in the production capacity. Knowledge on solids motion, mixing, and their relation to chemical reaction, heat and mass transfer in a gas-fluidized bed is of critical importance in the design of large scale fluidized bed combustors and reactors for desulfurization of solid fuels.

    Measuring the Gas-Solids Distribution in Fluidized Beds – a Review J. Ruud van Ommen and Robert F. Mudde Delft Univ. of Technology, The Netherlands The 12th International Conference on Fluidization, May [email protected] 1 van Ommen: Measuring the Gas-Solids Distribution in Fluidized Beds Published by ECI Digital Archives. literature have investigated the effect of gas-solids interactions between particles on the fluidized bed flow, unfortunately, less attention has been given to the influence of interaction between particles and wall on the hydrodynamics of fluidized bed. Li et al. (13) investigated the effect of this parameter and.

    Circulating fluidized beds consist of several configurations. The simplest version is a fluidized bed operated in the fast fluidization or even transport regime where the solids are captured with a primary cyclone (and perhaps further captured with secondary cyclones). From the cyclone, the solids are returned to the fluidized bed through a by: Gas mixing in a tall narrow fluidized bed operated in the slugging fluidization regime is simulated with the aid of computational fluid dynamics. In the first part, a parametric study is conducted to investigate the influence of various parameters on the gas by:


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Gas-solids intenaction in the zone of a fluidized-bed by Donald J Kirwan Download PDF EPUB FB2

Get this from a library. Gas-solids intenaction in the zone of a fluidized-bed: phase I. [Donald J Kirwan; Sterling Vines; United States.

Energy Research and Development Administration.]. Gas-solids interactions in the distribution zone of a fluidized bed: phase 1.

[Donald J Kirwan; Sterling Vines; United States. Energy Research and Development Administration.]. Gas–Solid Hydrodynamics in a Bubbling Fluidized-Bed Reactor: E ects of Air Distributor, Viscous and Drag Models was developed to determine the fluid-particle interaction during fast pyrolysis inside a fluidized bed reactor with a gh1 capacity [16].

The model was capable of calculating the heat, mass and except for the zone near Author: Ramin Khezri, Wan Azlina Wan Ab Karim Ghani, Salman Masoudi Soltani, Dayang Radiah Awang Biak, Robia.

Principles of Gas-Solid Flows - by Liang-Shih Fan January Author: Liang-Shih Fan, Chao Zhu. The axial pressure drop profile and the radial solids distribution were measured in a circulating fluidized bed for evaluating the effects of return gas-solids stream position on the riser flow.

Due to the high exhaust gas temperatures and injection of water, steam will be present in the fluidized bed reactor exhaust gas. To separate this steam from the air prior to disposal in the gas manifold, stream CS is connected to a detention tank (flash tank) (T).

Temperature and pressure have little effect on the gas and solids Gas-solids intenaction in the zone of a fluidized-bed book behavior. A small quantity of fine particles is noted to drastically affect the gas and solids mixing behavior in the turbulent fluidized bed.

The axial and radial dispersion coefficients of gas and solids reach their maximum when the fines content is about 15%.Cited by: Circulating-turbulent fluidized bed (C-TFB) was characterized by high solid holdup, homogenous axial and radial flow structure, no net downflow of solids and high contact efficiency in this study.

These flow dynamic properties were mainly represented by solid holdup profiles, the identification of flow regime and cluster dynamics in a riser, – mm in diameter and m in by: 8. Fig. 1 is a schematic flow sheet of the experimental apparatus. The two-reaction-zone (TRZ) reactor was located at the bottom and had an ID of mm and height of 2 m.

Immediately above the TRZ reactor was a riser that had an ID of 80 mm and height of m; the riser had high superficial gas velocities and circulated the : Shuaishuai Zhou, Chunxi Lu, Mengxi Liu. drop, characteristic of a fluidized bed reactor, baffles are the most suitable as reactor internals.

Over-cashier, et al'2 reported that the use of horizontal baffles narrows the retention time spectrum of gas and solids and permits concurrent or counter-current flow while not seriously reducing gas solids throughput or solids hold by: 3.

A FLUIDIZED bed is sometimes used as a means of carrying out a chemical reaction between a gas and solid particles. In gas-fluidized beds, ‘bubbles’ form and Cited by: 6.

Gas/Solid Flow Patterns in a cm Diameter Circulating Fluidized Bed. Recirculation of Particles in Fast Fluidized Risers. Solid Distribution and Movement in Circulating Fluidized Beds.

Measurement of Radial & Axial Solids Flux Variations in the Riser of a Circulating Fluidized Edition: 1. drying granular solids in a fluidized bed proefschri ft ter verkrijging van de graad van doctor in de technische wetenschappen aan de technische hogeschool eindhoven, op gezag van de rector magnificus, prof.

vander leeden, voor een commissie aangewezen door het college van dekanen, in het openbaar te verdedigen op Cited by:   Particles are flowing upwords mainly through the centre region of the pipe, which is different from that in the conventional pipes. Particles are. Purchase Fluidized Bed Technologies for Near-Zero Emission Combustion and Gasification - 1st Edition.

Print Book & E-Book. ISBN  In gas-solid fluidized beds, the distribution of the particles typically varies both in time and space. Since the gas-solids distribution and its variation have a strong influence on the performance of a fluidized bed for a given process, it is very important to accurately measure the Cited by: Model validation with pilot plant data and tracer data for a riser reactor will be presented and the short falls of traditional treatment of engineering fluidized bed reactor models will also be discussed.

Keywords: fluidized bed, gas–solid two-phase flow, reaction, CFD. Keywords. fluidized bed, gas–solid two-phase flow, reaction, : D. Mao, M. Tirtowidjojo. ABSTRACT: Effect of scale on the hydrodynamics of gas-solid fluidized beds was investigated in two fluidized beds of mm and 78 mm in diameter.

Air at room temperature was used as the fluidizing gas in the bed of sand particles. The Radioactive Particle Tracking (RPT) technique. abated, due to the development of circulating fluidized bed combustion chambers and steam drying of lignite. Fluidized beds are characterized by their excellent heat and mass transfer prop-erties, intense gas-solid mixing, and possibility of continuous and large-scale operations.

How-File Size: 4MB. Probing the convective-radiative zone interface by means of helio- and asteroseismology (invited paper) Gas-solids interactions in the distribution zone of a fluidized bed. Phase I. Quarterly. Fluidized Bed Technology: Principles and Applications presents the essential facts about beds of solid particles when fluidized by gases, and explains how the technology has been applied to yield fluidized bed boilers, furnaces, heat recovery systems and process plants.

The text is accompanied by worked examples, using elementary mathematics Cited by: works Search for books with subject Fluidization. One-dimensional model of fluidized bed combustor dynamics R.

B. Perez Not In Library. Fluidization and fluid-particle systems Frederick A. Zenz Not In Library. Not In Library. Gas-solids intenaction in the zone of a fluidized-bed Donald J Kirwan Not In Library. Not In Library.hydrodynamicsof the three phase fluidized bed depends on inter alia gas velocity, superficial liquid velocity, fluidized bed column height and diameter, physical properties of gas liquid and solid.

There are various research work undertaken in the area of fluidization engineering and its applications () since last four : S.N. Saha, G.P. Dewangan, R. Gadhewal.