Contact Us

C o n t a c t U s

(PDF) Modeling of Agglomeration in a Fluidized Bed

The agglomeration model developed to predict the agglomeration rate constant based on the temperature distribution in the fluidized bed and the rate of entrainment of particles into the jet

DEVELOPMENT OF A FLUIDIZED BED AGGLOMERATION

DEVELOPMENT OF A FLUIDIZED BED AGGLOMERATION MODELING METHODOLOGY TO INCLUDE PARTICLE-LEVEL HETEROGENEITIES IN ASH CHEMISTRY AND GRANULAR PHYSICS A Dissertation in Energy and Mineral Engineering by Dominant particle binding forces causing agglomeration in fluidized bed

Models of agglomerate growth in fluidized bed reactors

Sep 01, 2014 Some other models such as the Fluidized-Bed combustion deposition model is based entirely on empirical data and the model may only be used for comparative analyses. The agglomeration prediction model called FBCSUL which was developed using computer controlled scanning electron microscopy (CCSEM) assumes only alkali sulfates to be the cause of

(62f) Modeling the Agglomeration Process in Fluidized Bed

In this work, modeling is focused to describe the granulation phenomena on the basis of experimental observations of wheat powder granulation in fluidized bed. The experimental observations of PSD changes with time indicate that the evolution kinetics is analogous to

A model for agglomeration in bio-fuel fired fluidized bed

Oct 01, 2010 A mathematical model has been developed to describe the agglomeration process in bio-fuel fired fluidized bed combustor. Based on the balance mechanism of the adhesive force caused by liquid bonding between two particles and the breaking force induced by bubbles in the fluidized bed, the model considers modified Urbain model and chemical equilibrium calculations using FactSage modeling.

Modeling agglomeration processes in fluid‐bed granulation

Apr 16, 2004 Kazuyuki Yanagisawa, Naoki Shimada, Satoru Watano, Numerical Modeling for Direct Granulation of Agrochemical Suspension Using Fluidized Bed流動層を用いた農薬懸濁液の直接顆粒化法における顆粒成長の数値解析, Journal of the Society of Powder Technology, Japan, 10.4164/sptj.55.20, 55, 1, (20-28), (2018).

Stochastic model to simulate spray fluidized bed

Oct 01, 2019 1. Introduction. Spray fluidized bed agglomeration (SFBA) is a size enlargement process used to enhance the properties of powders .In this process, the liquid binder sprayed through a nozzle upon the fluidized particles wets the surface of the particles.

Bed Agglomeration Problems in Fluidized-Bed Biomass

Bed material agglomeration was studied experimentally in a fluidized-bed biomass combustor. Four biomass fuels, four bed materials, three bed additives, and three NO x additives were tested in a temperature range of 670−870 °C and at two pressure levels of 1.0 and 1.5 MPa. Two types of agglomeration were observed, a homogeneous and a heterogeneous type.

Experimental study and modeling of fluidized bed coating

Feb 19, 2003 Consider now the simultaneous coating and agglomeration in a batch fluidized bed. Generally, in a fluidized bed, due to the high intensity mixing of the particles in the bed, the population density is independent of spatial coordinates. If we consider, in addition, that the breakage rate is negligible in the system, Eq.

A tunable aggregation model incorporated in Monte Carlo

Mar 15, 2020 1. Introduction. Agglomeration is a size enlargement process consisting of many micro-scale mechanisms occurring in either parallel or series [1,2].Spray fluidized bed (SFB) technique is common in food, chemical and pharmaceutical industries as it produces dust free granules by mixing, drying and binder addition in a single equipment [3,4].Depending on the process conditions and the

DEVELOPMENT OF A FLUIDIZED BED AGGLOMERATION

DEVELOPMENT OF A FLUIDIZED BED AGGLOMERATION MODELING METHODOLOGY TO INCLUDE PARTICLE-LEVEL HETEROGENEITIES IN ASH CHEMISTRY AND GRANULAR PHYSICS A Dissertation in Energy and Mineral Engineering by Dominant particle binding forces causing agglomeration in fluidized bed

Experimental and Modeling Investigation of Liquid-Induced

Experimental and Modeling Investigation of Liquid-Induced Agglomeration in a Gas–Solid Fluidized Bed with Liquid Spray June 2020 Industrial & Engineering Chemistry Research XXXX(XXX)

Mechanisms of agglomeration in fluidized bed: Reactions

the reactants. The experimental data obtained in this work provide a basis for further modeling of the agglomeration process in fluidized bed combustion of biomass. INTRODUCTION Fluidized bed combustion is a promising technology for utilization of biomass for

Modeling ash agglomeration in fluidized bed combustion

Integrated models are required to predict agglomeration in FB gasification Ref: Khadilkar A., Rozelle P., Pisupati S., Models of agglomerate growth in fluidized bed reactors: critical review, status and applications, Powder Technology, 2014, In Press (Accepted for publication) Dry Collisions Hertzian Moseley et al. Zhou et al.

A model for agglomeration in bio-fuel fired fluidized bed

A mathematical model has been developed to describe the agglomeration process in bio-fuel fired fluidized bed combustor. Based on the balance mechanism of the adhesive force caused by liquid bonding between two particles and the breaking force induced by bubbles in the fluidized bed, the model considers modified Urbain model and chemical equilibrium calculations using FactSage modeling.

Numerical investigation of agglomeration phenomenon in

Oct 12, 2020 Because three-dimensional fluidized bed mostly contains millions of particles and simulating them takes a long computing time in DEM. As far as temperature is a dominant parameter in the agglomeration process, effects of inlet gas temperature are examined on the kinetic parameter.

Stochastic Modeling of Fluidized Bed Agglomeration

(2013). Stochastic Modeling of Fluidized Bed Agglomeration: Determination of Particle Moisture Content. Drying Technology: Vol. 31, Selected Papers Presented at the 18th International Drying Symposium (IDS2012), pp. 1764-1771.

Early warning of agglomeration in fluidized beds by

Apr 16, 2004 An enhanced monitoring method, based on pressure fluctuation measurements, for observing nonstationarities in fluidized‐bed hydrodynamics is presented. Experiments show that it can detect small changes in the particle‐size distribution. Such a monitoring method is useful to give an early warning of the onset of agglomeration in a fluidized bed.

Bed Agglomeration Problems in Fluidized-Bed Biomass

Bed material agglomeration was studied experimentally in a fluidized-bed biomass combustor. Four biomass fuels, four bed materials, three bed additives, and three NO x additives were tested in a temperature range of 670−870 °C and at two pressure levels of 1.0 and 1.5 MPa. Two types of agglomeration were observed, a homogeneous and a heterogeneous type.

Mechanisms of Bed Agglomeration during Fluidized-Bed

Apr 30, 2005 The major ash-related problem encountered in fluidized beds is bed agglomeration, which, in the worst case, may result in total defluidization of the bed and unscheduled downtime. Because of the special ash-forming constituents of biomass fuels, several of these fuels have been shown to be especially problematic. Despite the frequent reporting, a precise and quantitative knowledge of the bed

Bed Agglomeration Characteristics in Fluidized-Bed

The bed agglomeration characteristics during combustion of typical biomass fuels were determined in a bench-scale bubbling fluidized-bed reactor (5 kW) using olivine and quartz sand as bed material. The fuels studied include willow, logging residues, wheat straw, and wheat distiller’s dried grain with solubles (wheat DDGS). Bed material samples and agglomerates were analyzed by means of

Study of agglomeration in fluidized bed gasification of

CPFD model to simulate agglomeration in a bubbling fluidized bed gasifier. The ash-melting analyses are performed using a Leco Ash Fusion Determinator (AF700). In this test, the temperature at which the ash starts to melt is determined, giving a good indication of the temperature at which agglomerates can be formed. Laboratory prepared ash

Stochastic Modeling of Fluidized Bed Granulation

Mubashir Hussain, Mirko Peglow, Evangelos Tsotsas and Jitendra Kumar, Modeling of aggregation kernel using Monte Carlo simulations of spray fluidized bed agglomeration

Agglomeration Mechanisms during Fluidized Bed Combustion

The agglomeration phenomena are investigated by: 1) evaluating the interactions between model potassium compounds and silica sand in a lab-scale fluidized bed reactor; 2) examining the reaction mechanisms between K 2 CO 3 and silica sand; 3) performing combustion experiments of biomass and K-compounds doped biomass under different temperature

Study of agglomeration in fluidized bed gasification of

CPFD model to simulate agglomeration in a bubbling fluidized bed gasifier. The ash-melting analyses are performed using a Leco Ash Fusion Determinator (AF700). In this test, the temperature at which the ash starts to melt is determined, giving a good indication of the temperature at which agglomerates can be formed. Laboratory prepared ash

Mechanisms of agglomeration in fluidized bed: Reactions

the reactants. The experimental data obtained in this work provide a basis for further modeling of the agglomeration process in fluidized bed combustion of biomass. INTRODUCTION Fluidized bed combustion is a promising technology for utilization of biomass for

Development of a fluidized bed agglomeration modeling

The utility of fluidized bed reactors for combustion and gasification can be enhanced if operational issues such as agglomeration are mitigated. The monetary and efficiency losses could be avoided through a mechanistic understanding of the agglomeration process and prediction of operational conditions that promote agglomeration. Pilot-scale experimentation prior to operation for each

A model for agglomeration in bio-fuel fired fluidized bed

A mathematical model has been developed to describe the agglomeration process in bio-fuel fired fluidized bed combustor. Based on the balance mechanism of the adhesive force caused by liquid bonding between two particles and the breaking force induced by bubbles in the fluidized bed, the model considers modified Urbain model and chemical equilibrium calculations using FactSage modeling.

Stochastic Modeling of Fluidized Bed Agglomeration

(2013). Stochastic Modeling of Fluidized Bed Agglomeration: Determination of Particle Moisture Content. Drying Technology: Vol. 31, Selected Papers Presented at the 18th International Drying Symposium (IDS2012), pp. 1764-1771.

Monte Carlo modeling of binder‐Less spray agglomeration in

Jun 27, 2018 As no process models covering binder‐less spray agglomeration currently exist, a model based on a Monte Carlo method is presented. In this method, the process is described by events and processes on the single particle scale. Additionally, agglomeration experiments in a lab‐scale fluidized bed using three different maltodextrins are presented.

A model for fine particle agglomeration in circulating

A model for fine particle agglomeration in circulating fluidized bed absorbers (CFBAs) has been developed. It can model the influence of different factors on agglomeration, such as the geometry of a CFBA, the superficial gas velocity, initial particle size distribution (PSD), and type of agglomeration mechanism. It is found that the Brownian agglomeration mechanism can be neglected compared to

Mechanisms of Bed Agglomeration during Fluidized-Bed

Apr 30, 2005 The major ash-related problem encountered in fluidized beds is bed agglomeration, which, in the worst case, may result in total defluidization of the bed and unscheduled downtime. Because of the special ash-forming constituents of biomass fuels, several of these fuels have been shown to be especially problematic. Despite the frequent reporting, a precise and quantitative knowledge of the bed

Bed Agglomeration Characteristics in Fluidized-Bed

The bed agglomeration characteristics during combustion of typical biomass fuels were determined in a bench-scale bubbling fluidized-bed reactor (5 kW) using olivine and quartz sand as bed material. The fuels studied include willow, logging residues, wheat straw, and wheat distiller’s dried grain with solubles (wheat DDGS). Bed material samples and agglomerates were analyzed by means of

Stochastic Modeling of Fluidized Bed Granulation

Mubashir Hussain, Mirko Peglow, Evangelos Tsotsas and Jitendra Kumar, Modeling of aggregation kernel using Monte Carlo simulations of spray fluidized bed agglomeration

Experimental and Modeling Investigation of Liquid-Induced

Particle agglomeration induced by liquid bridge force widely exists in industrial fluidization processes involving liquid spray. To understand the agglomeration mechanism, a cold-mode fluidized bed loaded with wax-coated graphite particles is constructed and heated by an electromagnetic induction method. In the experiments, the wet agglomerate mass is obtained online through the pressure drop

Agglomeration Mechanisms during Fluidized Bed Combustion

The agglomeration phenomena are investigated by: 1) evaluating the interactions between model potassium compounds and silica sand in a lab-scale fluidized bed reactor; 2) examining the reaction mechanisms between K 2 CO 3 and silica sand; 3) performing combustion experiments of biomass and K-compounds doped biomass under different temperature

Destabilization of fluidized beds due to agglomeration

This is the first part of a series of two papers to study the agglomeration phenomenon which causes destabilization of certain low and high temperature fluidized beds. A theoretical model is proposed...

Experimental Study and Modeling of Fluidized Bed Coating

Most of the published results were obtained from low temperature systems in such applications as fluidized bed drying, agglomeration, coating and granulation [4,9,10, 18], which typically involve