Circulating fluidized bed reactor design and operation

Circulating fluidized bed reactor design and operation 39 --favourable turndown (typically 4:1) and good load following capabilities. This paper describes a pilot plant scale circulating fluidized bed unit recently designed, constructed and put into operation in the Pulp and Paper Centre at the

CFD modelling of the fast pyrolysis of biomass in ...

A complete fast pyrolysis model in bubbling fluidised bed reactors would have certain advantages over single particle models especially on the direction of reactor design. Simulating the complete process of fast pyrolysis, one can have a realistic view of what is happening inside the reactor.

Fluidised Bed Reactor Design for Pyrolysis - EPCM Holdings

1 Introduction to Fluidised Bed Reactor Design for Pyrolysis. Pyrolysis is the process where thermal conversion of organic matter occurs using a catalyst in the absence of oxygen, typically to produce liquid fuel. The products of biomass pyrolysis include bio-oil, biochar and Non-Condensable Gases (NCG) including various compositions of ...

Fluidized Bed Reactor - an overview | ScienceDirect Topics

Fluidized-bed reactors. Fluidized-bed reactors are theoretically an excellent reactor type choice for highly exothermic reactions, such as the FT reaction. Fluidized-bed reactors offer a much higher efficiency in heat exchange, compared to fixed beds, and better temperature control, due to the turbulent gas flow and rapid circulation.

DESIGN OF A GAS-SOLID FLUIDIZED BED REACTOR AT …

solid reactors. Consequently, a detailed design of a fluidized bed reactor that would allow flexible operation at high temperature and high pressure at several gas velocities will be conducted in order to serve for the future development of new hydrodynamic models.

Design and Optimization of Fluidized Bed Reactor Operating ...

Struvite crystallization using fluidized bed reactors (FBRs) is one of the most commonly used methods for nutrient recovery from different waste streams. However, struvite recovery from swine wastewater containing much higher solids using FBR has not been studied extensively. In this study, we therefore designed and optimized the key operating conditions parameters, i.e., pH (9.0, 9.5, and 10 ...

Introduction to Fluidization - AIChE

The heat-transfer rate in a fluidized bed can be five to ten times greater than that in a packed-bed reactor. Moving particles, especially small particles, can transport heat much more efficiently than gas alone. Even for the most extreme exothermic reactions, a fluidized bed can maintain an iso-thermal profile within a few degrees.

INTRODUCTION TO FLUIDIZED BEDS

a shallow fluidized bed of (Hmf/Dt) < 2 with Group B and D particles, Canada et al. (1978) and Dunham et al. (1993) found that Uc increased with static bed height. This could be related to the undeveloped bubble flow in shallow beds before transition to turbulent fluidization can occur (Bi et al. 2000). Particle Size and Density

Design of a Medium-Scale Circulating Fluidized Bed Reactor ...

The final design includes a fluidized bed reactor with a 2.4 m internal diameter and 8 m height and four parallel internal cyclones on top. 11 Like Comment Share.

Reactor - processdesign

In order to manually design a fluidized bed reactor which would yield a useful information, myriads of parameters such as porosity at minimum fluidization, minimum fluidization velocity, bubble size, minimum fluidization velocity, velocity of bubble rise, fraction of the total bed occupied by bubbles, fraction of the bed consisting of wakes, volume of the catalyst in the bubbles, …

Fluidized Bed Reactor Simulation In Aspen Plus

The fluidized bed reactor is a reactor in which the fluid from the bottom of the reactor keeps the solid catalysts suspended inside the reactor. This reactor has an advantage over traditional packed bed reactor because it has a better heat and mass transfer. In industry, the fluidized bed reactor is most prominently used to produce products which cannot be efficiently manufactured using …

Design of fixed bed catalytic reactors

which is important in the design procedure for any fixed-bed catalytic reactor. A bed of catalyst pellets is generally considered as if it were a continuous homogeneous media, and the physical properties of the packed bed or system are assigned values on the basis of a weighted average of each of the individual constituents making up the system.

FLUIDIZED BED REACTOR: DESIGN AND APPLICATION FOR ...

v Sl. No. TITLE PAGE NO. 3 DESIGN OF FLUIDIZED BED REACTOR 13 3.1 Design decision 14 3.1.1 Use of a Circulation System 14 3.1.2 Selection of Bed Type and Bubble Size 14

Biological wastewater treatment and bioreactor design: a ...

Attempts have also been made to propose improved design of fluidized bed biofilm reactors. For example, Narayanan et al. have successfully illustrated utilization of a diverging- converging fluidized bed biofilm reactor for the synthesis of lactic acid from cheese whey and molasses using the microbial cultures mentioned above and have reported ...

(DOC) 5 Reactor design | Edward Cheta - Academia.edu

5 Reactor design. DESIGN OF REACTOR CHAPTER No.5 REACTOR DESIGN FLUIDIZED BED REACTOR 5.1 INTRODUCTION Reactors:- Reactant gas can be made to contact solid catalyst in many ways, and each has its specific advantages and disadvantages. There are two broad types of Reactors. 1:- Fluidized Bed Reactor. 2:- Fixed Bed Reactors.

US4330502A - Fluidized bed reactor - Google Patents

A fluidized bed reactor which is capable of burning material containing incombustible matter which during operation accumulates in the form of large particles in the lower part of the reactor, is provided. A discharge system which causes coarse particles to be discharged in a continuous manner without discharging fine particles or combustible matter is provided.

Bed height and material density effects on fluidized bed ...

Fluidized bed reactors are important assets of many industrial applications. Understanding how a fluidized bed as a multiphase flow system operates will improve its capabilities and operations. Minimum fluidization velocity and local gas holdup are important parameters used to characterize the hydrodynamic behavior of a material inside

CONSTRUCTION OF A FLUIDZED BED REACTOR

The project is the construction of fluidised bed reactor. After a detailed research mild steel was chosen as the material of construction based on its inherent properties. The construction process entitles the marketing out of the sheet to the specified dimensions. This was followed by center punching and cutting.

US4226830A - Fluidized bed reactor - Google Patents

A fluidized bed reactor preferably for high temperature and pressure operations featuring reactor components and constriction plate arrangements therein capable of essentially unlimited size scaleup, the invention avoiding common reactor design and operational problems usually associated with the high temperature and pressure properties of metallic materials of construction such as: thermal ...

Design And Construction Of A Fluidized Bed

DESIGN AND CONSTRUCTION OF A FLUIDIZED BED by Robert Ryan Mota Bachelor of Science, California State Polytechnic University, Pomona, 2010 A Thesis

DESIGN OF A GAS-SOLID FLUIDIZED BED REACTOR AT HIGH ...

solid reactors. Consequently, a detailed design of a fluidized bed reactor that would allow flexible operation at high temperature and high pressure at several gas velocities will be conducted in order to serve for the future development of new hydrodynamic models.

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 ...

Chemical engineering and reactor design of a fluidised bed ...

To provide more comprehensive kinetic data for gas-solid reactions under isothermal conditions, a thermogravimetric fluidized bed reactor (TGFBR) was designed. Using this novel fluidised bed, gravimetric measurements and high heating rate, the thermal conversion of biomass was investigated. Using a thermogravimetric analyser (TGA) as a fixed ...

Lecture 18 - Fluidized-bed Reactor Design

Lecture 19 - Fluidized-bed Reactor Design (cont.) Lecture 20 - Gas-liquid Reactions (GLR): Theories of Mass Transfer into Agitated Liquids Lecture 21 - GLR: Effect of Chemical Reaction on Mass Transfer: the Slow Reaction Regime

SAFE DESIGN AND OPERATION OF FLUIDIZED-BED …

design and operate a fluidized-bed reactor. In their approach a plot is made of the slope of the heat withdrawal rate line-as known from the theory of tank reactors-vs the residence time in reactor. In this plot all constraints to the design and operation can be shown and result in a region of possible

Conceptual Process Design and Techno-Economic …

pyrolysis reactor, and (2) ex situ, or in separate reactors after the removal of bulk solids including reactor bed material, char, and mineral matter. These process config-urations were detailed in a recent design report led by the National Renewable Energy Laboratory (NREL) [5]. A circulating fluidized bed configuration, using metal-modi-

(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 ...

Basic Design of a Fluidized Bed Reactor for Wastewater ...

The Fluidized Bed reactor design should be made according to information available in the literature. The formulas for the design parameters are to be selected from vast literature available on researches in fluidized bed reactors and the study of fluidization profiles. Table II also gives us an insight

Fluidised bed reactor design | thechemengproject

The good thing is though, designing a fluidised bed reactor will give me a large experience on reactor design and give me a deep understanding of reactors in general and fluidised bed reactors in industry, it will also (hopefully) give me some idea of were to get specific information from for reactor design, or design in general.

Fluidized bed reactor design and scale-up - ScienceDirect

Reactor design combines the present accumulated knowledge about fluidized bed hydrodynamics with reaction chemistry and scale-up to optimize the desired production of a chemical. Reactor design and scale-up are intertwined through fluidized bed hydrodynamics, and both have to proceed in parallel with each other. 10.1.1.