problem of quartz lined fluidized bed reactor

problem of quartz lined fluidized bed reactor

JPL IN-HOUSE FLUIDIZED-BED REACTOR RESEARCH

jpl in-house fluidized-bed reactor research jet prcpulsion laboratory n.k. roh~tgi silicon withdrawal system quartz liner system design * problem possible breakage of quartz liner during thermal cycle design criterion nd silane should be allowed to flow in bflween quartz liner and stainless steel reactor

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Development of a 5kWth internally circulating fluidized ...

Jan 01, 2019  The quartz tube fluidized bed reactor was tested in a 2 kW th solar furnace for the thermochemical steam and CO 2 gasification of charcoal, wood, and paper. Maurry et al. researched steam gasification of cellulose using a fluidized bed quartz tube reactor that was installed in a black-body receiver to reduce radiative heat loss. Steel and ...

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FLUIDIZED BED REACTOR: DESIGN AND APPLICATION FOR ...

2.1.8 Fluidized Bed Method 6 2.2 The Al- industry waste 7 2.3 Behaviour of fluidized bed 7 2.3.1 Minimum Fluidization Velocity 7 2.3.2 Pressure Drop 8 2.3.3 Bed Expansion Ratio (R) 8 2.3.4 Bed Fluctuation Ratio (r) 9 2.3.5 Fluidisation quality (FQ) 9 2.4 Fluidized bed reactor 9 2.4.1 Fluidized bed Reactor 9

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Construction Of A Fluidzed Bed Reactor - Pdf Doc

1.2 Statement of the problem - - - - 2. 1.3 Purpose/Aims of the study ... It is hoped that the result of this study will serve as tool for helping users of fluidized bed reactor to have an effective new look at what the modern fluidized bed reactor is like. Also the study will as well created new modern technology that will be easier to use.

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Figure R12.3-1 From Kunii and Levenspiel Fluidization ...

model of the fluidized-bed reactor developed thus far–the bubbling bed model of Kunii and Levenspiel. 1 This material is based on the article by H. S. Fogler and L. F. Brown [Reactors, ACS Symposium Series, vol.168, p. 31 1981, H. S. Fogler ed.], which in turn was based on

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Introduction to Fluidization - AIChE

Nov 21, 2014  a fluidized-bed regenerator. Fluidized beds typically are more complex to design, build, and operate than other types of reactors, such as packed-bed and stirred-tank reactors. Scaleup of fluidized beds can be difficult (1). Fluidized beds are prone to erosion and particle attrition caused by the moving particles. Solids

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Lecture 36: Fluidized Bed Reactor Design Part I ...

Fluidized Bed Reactor Design Part Iby IIT Madras. ← Video Lecture 36 of 43 → . 1: Introduction to Kinetics: Gas solid non-catalytic reaction 2: Introduction to Kinetics: Catalytic reactions in different reactors 3: Heterogeneous rate of reactions and different types of kinetic models 4: Basics of Kinetics of type A B reactions 5 ...

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55 questions with answers in FLUIDIZED BED REACTORS ...

Jun 12, 2021  9 answers. Jan 2, 2021. We are trying to fluidize sand of diameter 300 to 600 microns using a fluidized bed of diameter 65mm. The bed is fluidizing at 0.7

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(PDF) DESIGN AND FABRICATION OF FLUIDIZED-BED REACTOR ...

Abstract A fluidized-bed reactor was designed and constructed for practical demonstration of the fluidization of solid particles at different fluid flow rates. The bed of this reactor was sand particles of average size 1800 μm ,weighed 0.6 N and the fluidizing fluidwas air. Alternatively, the fluidizing fluid can be substituted for any given ...

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Fluidized Bed Furnace with 2'' O.D Quartz Tube for CVD ...

OTF-1200X-S-FB is a Fluidized Bed Furnace for CVD applications. It consists a vertical-positioned cylindrical heating chamber which surrounds the quartz tube with a built-in filter right in the lower middle section of the central heating zone. Its filter is a porous (5~15 microns) quartz frit that allows the controlled steam of gas pass through and such an action will float the particles on a ...

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JPL IN-HOUSE FLUIDIZED-BED REACTOR RESEARCH

jpl in-house fluidized-bed reactor research jet prcpulsion laboratory n.k. roh~tgi silicon withdrawal system quartz liner system design * problem possible breakage of quartz liner during thermal cycle design criterion nd silane should be allowed to flow in bflween quartz liner and stainless steel reactor

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A New Method to Inhibit Bed Agglomeration Problems in ...

Dec 22, 2008  This problem can be avoided by using AGGLOSTOP™ quartz-free bed material. Four different bed materials were tested in a 15 kW laboratory-scale FBC test rig with plywood residue, which is known to cause severe fluidization problems in FB boilers. Two of the tested bed materials were quartz

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(PDF) Modeling of a fluidized-bed photocatalytic reactor ...

Modeling of a fluidized-bed photocatalytic reactor for water pollution abatement. Chemical Engineering Science, 2001 ... and, at the same time, to enable a high #uid-renewal rate.A #uidized bed with quartz support particles impregnated with titanium oxide is a reasonable reactor alternative. ... Since, the problem deals with a catalytic ...

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US5374413A - Heating of fluidized bed reactor by ...

An improved method is provided for the deposition of high-purity silicon on silicon particles from silicon source gases in a fluidized bed reactor which is divided into a heating zone and a reaction zone by a partition. Silicon particles in the heating zone are fluidized by a carrier gas such as hydrogen and are heated by microwaves. On the other hand, the reaction zone for the deposition of ...

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Simulation for Supporting Scale-Up of a Fluidized Bed ...

Simulation of fluidized bed reactor (FBR) was accomplished for treating wastewater using Fenton reaction, which is an advanced oxidation process (AOP). The simulation was performed to determine characteristics of FBR performance, concentration profile of the contaminants, and various prominent hydrodynamic properties (e.g., Reynolds number, velocity, and pressure) in the reactor.

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Analysis of Fluidized-Bed and Fluidized-Bed-Membrane ...

this case, the fluidized-bed provides an isothermal catalyst bed and the membranes provide distributed dosage of oxygen, supplying the advantages of both fluidized-bed and membrane reactors in one reactor. The highest C 2 yield achieved from this reactor was 19.5% with a

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US8075692B2 - Fluid bed reactor - Google Patents

Fluidized bed reactor systems for producing high purity silicon-coated particles are disclosed. A vessel has an outer wall, an insulation layer inwardly of the outer wall, at least one heater positioned inwardly of the insulation layer, a removable concentric liner inwardly of the heater, a central inlet nozzle, a plurality of fluidization nozzles, at least one cooling gas nozzle, and at least ...

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Studies on Design of Bio Semi Fluidized Bed Reactor

fluidized bed is enhanced by semi- fluidized bed reactor. It is a novel type of fluid-solid contacting device. The semi fluidized bed is characterized by a fluidized bed and a fixed bed in series with single contacting vessel. The phenomenon of semi fluidization was first reported which was related to mass to mass transfer in a liquid solid ...

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An experimental study of the partial oxidation of ethane ...

Donsi et al.5 Monolith reactor LaMnO 3 Klose et al.1 Packed bed reactor, Packed bed membrane reactor VO x/ – 2O 3 Zhang et al.2 Fixed-bed flow quartz glass micro reactor NiO/Al 2O 3 Panizza et al.3 Fixed-bed flow tubular quartz reactor V 2O 5–K 2O/Al 2O 3 In this work, the applicability of a fluidized bed reactor for this reaction was explored.

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US20090004090A1 - Method for Preparing Granular ...

The present invention relates to a method for mass preparation of granular polycrystalline silicon in a fluidized bed reactor, comprising (a) a reactor tube, (b) a reactor shell encompassing the reactor tube, (c) an inner zone formed within the reactor tube, where a silicon particle bed is formed and silicon deposition occurs, and an outer zone formed in between the reactor shell and the ...

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US7029632B1 - Radiation-heated fluidized-bed reactor ...

A radiation-heated fluidized-bed reactor and a process for producing high-purity polycrystalline silicon by using this reactor are provided. In this reactor, a heater device ( 14 ) is a radiation source for thermal radiation which is arranged outside the inner reactor tube and as a cylinder around the heater zone, without being in direct contact with the inner reactor tube.

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Thermal Processing Hazen Research

12 in. Fluidized-Bed Reactor; 15 in. Refractory-Lined Fluidized-Bed Reactor; 24 in. Refractory-Lined Fluidized-Bed Reactor; Rotary Kilns. 2-7 in. High Temperature Furnace (various configurations and materials of construction) 4 in. Rotary Batch Kiln (quartz) 7 in. Rotary Batch Kiln (quartz) 7 in. Continuous Rotary Kiln; 15 in. Direct-Fired ...

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cvd reactor - Pool Solutions

Fluidized bed chemical vapor deposition (FBCVD) is a process technology use to coat powders or particles. The fluidized bed reactor (FBR) is designed to allow for injecting a fluidizing gas with the appropriate vapor or gas CVD precursor. As the powder is fluidized, the vapors/gasses will permeate through the powder and react to form thin films .

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Sticking-Free Reduction of Titanomagnetite Ironsand in a ...

Jun 11, 2019  Fluidized bed reduction of iron ore fines is typically inhibited by the onset of “sticking” at temperatures above 973 K, which leads to particle agglomeration and defluidization of the bed. Here, we report the sticking-free fluidized bed reduction of titanomagnetite (TTM) ironsand at 1223 K in Ar-H2 gas mixtures. We show that sticking is prevented by the formation of a protective titanium ...

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Agglomeration of the bed material in fluidized bed ...

Agglomeration of the bed material in fluidized bed reactors for thermal conversion of biomass - A threat for ... controlling the problem with agglomeration in dual fluidized bed reactors. The Research Boiler at Chalmers Univ. of Techn. o o 8 9 12 2 3 1 11 Rear ... quartz bed particles. D) Direct adhesion between ash particles. Solid ash Particles.

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Manufacture of Granular Polysilicon from Trichlorosilane ...

fluidized bed reactor was made of quartz and heated by a resistance furnace outside the reactor. Liquid SiHCl 3 was vaporized and mixed with H 2 in a specially designed heated mixer, and the gas mixture was fed into the reactor through a gas distributor at the bottom of the reactor. The fluidized bed had an expanded head of 0.08 m I.D.

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Principles of Pyrolysis

alleviate this problem. 2. Bubbling Fluidized Bed Reactor Bubbling fluidized beds, biomass particles are introduced into a bed of hot sand fluidized by a recirculated product gas. The high heat transfer rates from fluidized sand cause rapid heating of biomass particles and some ablation by attrition with the sand particles occurs. The bubbling

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Process Puzzler: Fix a Fluidized Bed Chemical Processing

Apr 02, 2014  Next, look at the air locks on the first bed and at the recycle compressor discharge and inlet of the second bed. You'll also want to inspect the product line connecting to the receiver feeding the second fluid-bed reactor. Look for solids buildup; take samples for scanning with an electron microscope. Dirk Willard, senior process engineer

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Growth of carbon nanofibers from Ni with a fluidized bed

in the fluidized bed, ended up in the rest of the set-up. Figure 3.2 Photographic (a) and schematic (b) representation of the fluidized bed reactor and cyclone. The total length of the reactor was 400 mm, the fluid bed zone was 250 mm. The reactor had a 34 mm external diameter and a 25 mm internal diameter, which shows the thickness of the

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Performance evaluation of an anaerobic fluidized bed ...

operating problems such as bed clogging and high pressure drop, which would be the case if such high-surface-area media were used in a packed bed reactor. A further advantage of using media to retain the biomass within the reactor is the possible elimination of the secondary clarifier. The feasibility of the use of natural zeolite as a support

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Chalmers Publication Library

Fluidized bed reactors are well suited for thermochemical con-version of a wide range of biomass and waste fuels provided that the fuel can be given a suitable particle size. This technology is characterised by the bed which, in terms of combustion, is oper-ated at

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Recarbonization of drinking water in fluidized-bed reactor ...

Apr 13, 2017  Investigation of drinking-water recarbonization process is the main aim of this work. Experiments aimed at increasing of Ca2+ and Mg2+ in water were carried out in laboratory scale fluidized-bed reactor. This technique offers potential for increasing of reaction surface area and overall reaction rate, and represents a new approach in drinking-water industry.

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Fast Pyrolysis of Biomass in a Fluidized Bed Reactor: In ...

A system to remove in situ char/ash from hot pyrolysis vapors has been developed and tested at the University of Twente. The system consists of a continuous fluidized bed reactor (0.7 kg/h) with immersed filters (wire mesh, pore size 5 μm) for extracting pyrolysis vapors. Integration of the filter system in the fluidized bed should overcome operational problems related to the increase in ...

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Sticking-Free Reduction of Titanomagnetite Ironsand in a ...

Jun 11, 2019  Fluidized bed reduction of iron ore fines is typically inhibited by the onset of “sticking” at temperatures above 973 K, which leads to particle agglomeration and defluidization of the bed. Here, we report the sticking-free fluidized bed reduction of titanomagnetite (TTM) ironsand at 1223 K in Ar-H2 gas mixtures. We show that sticking is prevented by the formation of a protective titanium ...

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Pyrolysis behavior and kinetic study of phenol as tar ...

bed reactor is the key part of the MFBR, which is made of quartz and it is capable of bearing high temperatures around 1200 C for a long time. The overall height and diameter of the fluidized bed reactor are 373 mm and 290 mm, respectively. The internal height and diameter of the reaction zone are 42 mm and 20 mm, respectively. The mass ...

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Bubbling fluidized bed reactor - SlideShare

Nov 21, 2013  Bubbling Fluidized Bed Reactor Presentation By Akshay Patil. 2. Types Of reactor 1)Bubbling Fluidized Bed 2)Circulating Fluidized Bed 3)Flash Reactor 4)Annular Fluidized Bed. 3. Bubbling Fluidized Bed Reactor. 4. Principle Fluid Passes through Bottom with low velocity first to settle down the Solid Material on the Porous Plate called Distributor.

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Photocatalytic Oxidation of Ethyl Alcohol in an Annulus ...

2. Fluidized Bed Photoreactor The schematic diagram of the experimental test set-up is shown in Fig. 4. The fluidized bed has an inside diameter of 0.06 m and is 1.0 m long and is made of acrylic pipe. The UV lamp was installed at the center of the reactor through the inside of the quartz tube of

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US Patent Application for FLUIDIZED BED REACTOR FOR ...

Aug 23, 2017  16. A granular polycrystalline silicon fluidized-bed reactor, comprising: a segmented reactor tube disposed between a reactor top and a reactor bottom, one or more heaters, at least one nozzle for supplying fluidizing gas, at least one nozzle for supplying silicon-containing reaction gas, a silicon seed particle feed, a product removal line, and an off gas removal line, wherein the reactor ...

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