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Full-Text Articles in Engineering

Rotating Heater Pyrolyzer (Rhp): A New Pyrolysis Technology For Biochar Production, Ariel Porat Nov 2019

Rotating Heater Pyrolyzer (Rhp): A New Pyrolysis Technology For Biochar Production, Ariel Porat

Electronic Thesis and Dissertation Repository

Biochar provides an effective and inexpensive carbon sequestration technology to combat climate change. It is formed through a process known as pyrolysis; where biomass is thermally decomposed in the absence of oxygen. In this study, a new pyrolysis reactor called the Rotating Heater Pyrolyzer (RHP) was designed and built for biochar production. RHP derived biochar properties were compared to biochars produced with a standard batch pyrolysis reactor (Pyrolytic Shaker Reactor (PSR)) to determine RHP performance. Using several biochar characterization techniques, the soil amendment potential of two solid anaerobic digestate feedstocks were investigated. Woodchip RHP derived biochar processed between 2-3 hrs ...


A Comprehensive Study Of Sequential Simulated Moving Bed: Purification Of Xylo-Oligosaccharides And Fructose-Glucose, Yan Li Oct 2019

A Comprehensive Study Of Sequential Simulated Moving Bed: Purification Of Xylo-Oligosaccharides And Fructose-Glucose, Yan Li

Electronic Thesis and Dissertation Repository

Chromatographic separation is a promising alternative for separation and purification of sugars in industry. Simulated moving bed (SMB) technique has been proven as an efficient chromatographic separation method due to its enhanced productivity and purity, reduced solvent consumption, convenient operating control, and improved separation performance for some systems with low resolution and selectivity. The sequential simulated moving bed (SSMB) is a modification of the conventional SMB process, which currently has some applications for sugar separation due to its low solvent consumption. This work mainly investigates the design strategy of the innovative SSMB process and explore its advantages and disadvantages over ...


Development Of A Co-Rotating, Fully Intermeshing Twin-Screw Extruder Model For The Extrusion Of Natural Fibre Suspensions, Keller J H George Sep 2019

Development Of A Co-Rotating, Fully Intermeshing Twin-Screw Extruder Model For The Extrusion Of Natural Fibre Suspensions, Keller J H George

Electronic Thesis and Dissertation Repository

Twin-screw extruders are continuous processing devices that have been used in many industries concerned with the processing of multiphase fibrous suspensions, such as the food and pulping industries. While these devices offer great flexibility due to their modularity and customizability, optimization for specific applications can be challenging due to the unavailability of reliable, global models with accurate predictive capabilities. Consequently, this work seeks to eliminate this knowledge gap with the development of a novel global, composite model capable of predicting key process outputs for suspension-processing, phase-separating, co-rotating, fully-intermeshing twin-screw extruders. Creation of the novel global algorithm involved the modification of ...


Hydrodynamics Studies Of Air Dense Medium Fluidized Bed With Binary Mixtures For Dry Coal Beneficiation, Zhijie Fu Jul 2019

Hydrodynamics Studies Of Air Dense Medium Fluidized Bed With Binary Mixtures For Dry Coal Beneficiation, Zhijie Fu

Electronic Thesis and Dissertation Repository

A systematic and comprehensive study of fluidization hydrodynamics and separation properties was conducted in a bench-scale and a semi-industrial Air Dense Medium Fluidized Bed (ADMFB) systems for dry coal beneficiation. In order to achieve the adjustment of fluidized bed density for efficient dry gravity separation, various types of binary mixtures of solid particles were tested and used as the medium materials in ADMFB. Fluidization hydrodynamics including minimum fluidization velocity, fluidized bed expansion, solids mixing/segregation, and bed density distribution were carefully investigated. A series of continuous experiments of raw coal dry beneficiation were successfully implemented in a semi-industrial ADMFB system ...


Effect Of Coagulant Recycling On Chemically Enhanced Primary Treatment Performance, Tulip Chakraborty Apr 2019

Effect Of Coagulant Recycling On Chemically Enhanced Primary Treatment Performance, Tulip Chakraborty

Electronic Thesis and Dissertation Repository

Chemically enhanced primary treatment (CEPT) process is a promising method for carbon redirection and improving the performance and efficiency of wastewater treatment processes. CEPT is employed to precipitate colloidal and suspended matter from wastewater; however, this requires a significant amount of coagulant and produces large volumes of sludge. Coagulant recovery (CR) from the precipitated sludge has the potential to reduce sludge quantities, associated costs for disposal of sludge, cost of dosing fresh coagulant by regenerating and purifying the coagulant before reuse. This research was conducted to understand the feasibility and implications of CR in municipal wastewater.

In order to evaluate ...


Analysis And Control Of Aluminum Concentration In Groundwater: Mathematical Modelling And Laboratory Study, Daria Popugaeva Feb 2019

Analysis And Control Of Aluminum Concentration In Groundwater: Mathematical Modelling And Laboratory Study, Daria Popugaeva

Electronic Thesis and Dissertation Repository

The remediation of metal-contaminated natural water bodies is prioritized due to metals toxicity, non-biodegradable properties, and accumulative behaviours leading to the increased incidence of adverse health effects. Current investigation is driven by the existing problem of elevated aluminum concentrations in the groundwater of Khibiny alkaline massif (Kola Peninsula). The prohibitive aluminum level exceeding the accepted standard of 0.20 mg L−1 is described as a serious health concern when the groundwater used for the local water supply. The results of comprehensive field data analysis based on chemometric methods applied to the available monitoring data including 12 groundwater quality parameters ...


Extraction Of Astaxanthin From H. Pluvialis Using Deep Eutectic Solvents, Roya Barzegar Oct 2018

Extraction Of Astaxanthin From H. Pluvialis Using Deep Eutectic Solvents, Roya Barzegar

Electronic Thesis and Dissertation Repository

Haematococcus pluvialis (H. pluvialis) is one of the main sources of astaxanthin, a high value carotenoid and a strong antioxidant. Astaxanthin extraction is hindered by the thick cell wall of H. pluvialis which is composed of sporopollenin. Mechanical cell disruption methods, high cost and energy-consuming, are required to enhance astaxanthin extraction. This study employed a novel technology using deep eutectic solvents (DESs) to demonstrate the possibility of direct extraction of astaxanthin without a disruption step. It was established that 68% of astaxanthin can be extracted from intact H. pluvialis cells using choline chloride-glycerol (ChCl-G) mixture with 12.5% (v/v ...


Hydrodynamics Of A Gas-Driven Gas-Liquid-Solid Spouted Bed, Jia Meng Aug 2018

Hydrodynamics Of A Gas-Driven Gas-Liquid-Solid Spouted Bed, Jia Meng

Electronic Thesis and Dissertation Repository

A novel cylindrical gas-driven gas-liquid-solid spouted bed was developed in this project, which has a high potential to be used for a biological wastewater treatment process. Solids motion, flow regimes, and regime transitions in this system were studied. With increasing gas velocity, four regimes were identified, including: fixed bed, semi spouted bed, full spouted bed and internal circulating fluidized bed. The respective gas velocities for the transitions between the four regimes were experimentally identified and termed as minimum spouting velocity, full spouting velocity and minimum circulating velocity. A new “basketing” method was adopted to measure the minimum spouting velocity while ...


Bubble Dynamics And Dense Phase Composition In 2-D Binary Gas-Solid Fluidized Bed, Tianzi Bai Aug 2018

Bubble Dynamics And Dense Phase Composition In 2-D Binary Gas-Solid Fluidized Bed, Tianzi Bai

Electronic Thesis and Dissertation Repository

Gas-solid bubbling fluidized bed with binary particles is a potential candidate for performing the dry coal beneficiation process due to its advantages such as the ability to adjust separation density and the elimination of process water. A two-dimensional (2D) fluidized bed was used to study bubble dynamics and dense phase composition distribution in order to gain some fundamental understanding of this system. Digital image analysis (DIA) was employed to measure bubble diameter, bubble rise velocity, bed expansion and particle composition distribution. Magnetite and sand particles as pure and binary mixtures were used in the fluidized bed. Bubble diameter and bubble ...


Numerical Investigations Of Bubble Column Equipped With Vertical Internals In Different Arrangements, Tuntun Gaurav Aug 2018

Numerical Investigations Of Bubble Column Equipped With Vertical Internals In Different Arrangements, Tuntun Gaurav

Electronic Thesis and Dissertation Repository

Bubble columns are multiphase contactors with wide applications in industrial processes. Often they are equipped with longitudinal tube bundles to facilitate heat exchange. Studying effects of these internals on column hydrodynamics is vital for the design of these internals. Computational Fluid Dynamic (CFD) simulations provide an understanding of the complex two-phase flow enabling the study of the effects of the internals on the column hydrodynamics. In the present work, an Eulerian-Eulerian based two-fluid model (TFM) coupled with a population balance model (PBM) is used to simulate the gas-liquid two-phase flows in bubble columns. The models studied were validated using experimental ...


Impact Of Trace Element Ions And Fe2+ On Anaerobic Food Waste Digestion, Andisheh Yazdanpanah Aug 2018

Impact Of Trace Element Ions And Fe2+ On Anaerobic Food Waste Digestion, Andisheh Yazdanpanah

Electronic Thesis and Dissertation Repository

In Canada, about $31 billion worth of food is wasted annually. This amount of food waste (FW) ends up in landfills where it is naturally broken down by bacteria and releases methane to the atmosphere, a powerful greenhouse gas (GHG) which is 21 times more harmful to the environment than carbon dioxide (CO2). This process can also be done in a controlled environment at wastewater treatment plants, in a process known as anaerobic digestion (AD). Diverting food waste from landfills to wastewater treatment facilities allows for the capture of the methane, which can be used as an energy source ...


Corrosion Scale Characteristics And Lead Oxide Dissolution In Chloraminated Water, Daoping Guo Jun 2018

Corrosion Scale Characteristics And Lead Oxide Dissolution In Chloraminated Water, Daoping Guo

Electronic Thesis and Dissertation Repository

The presence of lead in drinking water is a common issue for utilities where lead pipes are used as service lines in drinking water distribution systems. Dissolved lead concentrations have been linked to the destabilization of stratified lead corrosion scales formed at the inner walls of lead pipe used as drinking water service lines. To develop a framework for lead dissolution control, it is necessary to fully describe the characteristics of the surface layer of the lead corrosion scale in direct contact with drinking water. In the first part of this thesis, a thorough lead corrosion scale characterization is carried ...


The Production Of Pyrolytic Biochar For Addition In Value-Added Composite Material, Douglas Matthew Cuthbertson Jan 2018

The Production Of Pyrolytic Biochar For Addition In Value-Added Composite Material, Douglas Matthew Cuthbertson

Electronic Thesis and Dissertation Repository

Pyrolytic biochar has recently gained attention for its potential value as a carbon sequestering by-product that can be used in industrial applications. While biochar is typically targeted for soil amendment applications, higher value applications such as addition in consumer products and building materials needs to be investigated.

In this study, biochar is produced from three different Canadian feedstocks using three different pyrolysis methods. The biochar is characterized to determine the effects that feedstock selection and pyrolysis conditions has on biochar properties. The biochar is also incorporated into concrete at varying concentrations to create a lightweight and sustainable material. The effect ...


Adaption Of Catechol And Reversible Addition-Fragmentation Chain-Transfer (Raft) Chemistries For Water-Based Applications, Olabode Oyeneye Dec 2017

Adaption Of Catechol And Reversible Addition-Fragmentation Chain-Transfer (Raft) Chemistries For Water-Based Applications, Olabode Oyeneye

Electronic Thesis and Dissertation Repository

Incorporating the binding chemistry of catechol functionality with RAFT chemistry offers a facile and simplified approach for developing a suite of new 2D and 3D hybrid materials with tailored morphologies. Leveraging both chemistries by synthesizing catechol-end functionalized RAFT agents and catechol-containing monomeric species for RAFT (co)polymerization, this dissertation examined a new series of advanced materials that were designed for water-based applications including model flocculants, thermoresponsive hydrogels, adsorbents and underwater adhesives.

To prepare the RAFT agents, novel trithiocarbonates with several catechol end R groups (as postpolymerization anchors) were synthesized that differ in their carbonyl α-substituents (Dopa-CTAs). These materials were evaluated ...


Fabrication And Modification Of Titania Nanotube Arrays For Harvesting Solar Energy And Drug Delivery Applications, Ahmed El Ruby Abdel Rahman Mohamed Dec 2017

Fabrication And Modification Of Titania Nanotube Arrays For Harvesting Solar Energy And Drug Delivery Applications, Ahmed El Ruby Abdel Rahman Mohamed

Electronic Thesis and Dissertation Repository

The fast diminishing of fossil fuels in the near future, as well as the global warming caused by increasing greenhouse gases have motivated the urgent quest to develop advanced materials as cost-effective photoanodes for solar light harvesting and many other photocatalytic applications. Recently, titania nanotube arrays (TNTAs) fabricated by anodization process has attracted great interest due to their excellent properties such as: high surface area, vertically oriented, highly organized, one-dimensional, nanotubular structure, photoactivity, chemical stability and biocompatibility. This unique combination of excellent properties makes TNTAs an excellent photoanode for solar light harvesting. However, the relatively wide band gap energy of ...


Study Of Motion Of Agglomerates Through A Fluidized Bed, Muhammad Owais Iqbal Bhatti Dec 2017

Study Of Motion Of Agglomerates Through A Fluidized Bed, Muhammad Owais Iqbal Bhatti

Electronic Thesis and Dissertation Repository

Formation of agglomerates in Fluid CokersTM can cause operating problems, such as excessive shed fouling, which can lead to premature unit shut down. Better understanding of how agglomerates move through a fluidized bed can help improve the design and operation of Fluid CokersTM and minimize the risk of agglomerates reaching regions where they cause problems.

To identify key factors in agglomerates motion in a fluidized bed, a new two-dimensional (2D) Radioactive Particle Tracking (RPT) method was developed which tracks model agglomerates motion. In conjunction, a tribo-electric method was used to determine bubble flow distribution in the fluidized bed ...


Synthesis Of Vo2 Nanomaterials Using Green Solvents For Thermochromic Window Coatings, Hanna Qin Dec 2017

Synthesis Of Vo2 Nanomaterials Using Green Solvents For Thermochromic Window Coatings, Hanna Qin

Electronic Thesis and Dissertation Repository

Progress in the development of energy-efficient coatings has led to recent investigations of smart windows with the ability to control heat and light. Of particular interest for this dissertation is the fabrication of vanadium dioxide (VO2) thermochromic nanomaterials using an environmentally friendly approach with good performance for optical switching. Tungsten (W) doped VO2/GO (graphene oxide) hybrids were successfully prepared using a one-step hydrothermal method. At 2 at. % doping, VO2 nanotubes were successfully synthesized with tunable phase transition temperatures (Tc) achieved as low as 42oC. In addition, various experimental parameters including reaction temperature, reaction ...


Crystal Engineering Of Active Pharmaceutical Ingredients With Low Aqueous Solubility And Bioavailability, Jenna M. Skieneh Aug 2017

Crystal Engineering Of Active Pharmaceutical Ingredients With Low Aqueous Solubility And Bioavailability, Jenna M. Skieneh

Electronic Thesis and Dissertation Repository

Approximately 75% of new molecular entities approved by the Food and Drug Administration (FDA) for use in the pharmaceutical industry are found to have poor aqueous solubility. This undesirable attribute leads to consequences such as higher doses required to reach therapeutic levels, greater vulnerability to food effects, lesser fraction absorbed in the small intestine and damage to the environment due to increased quantity of excretion. The addition of an excipient (i.e. a FDA approved inactive ingredient) to the molecular structure of an active pharmaceutical ingredient (API) through intermolecular bonding is of growing interest because the properties of the API ...


Hydrodynamics In The Gas-Driven Inverse Liquid-Solid Fluidized Bed, Jiaqi Huang Aug 2017

Hydrodynamics In The Gas-Driven Inverse Liquid-Solid Fluidized Bed, Jiaqi Huang

Electronic Thesis and Dissertation Repository

A novel reactor named Gas-Driven Inverse Liquid-Solid Fluidized Bed (GDFB for short) was developed in this research. A vertical baffle divides the column into a riser and a downer. Inverse fluidization is driven by the gas and occurs in the downer, where hydrodynamics and their influencing factors were studied. In the solid-baffle system, four fluidization regimes were observed, including the packed bed, semi-fluidized bed, fully-fluidized bed, and circulating bed. Bed expansion ratio was higher for particles with a higher density and a smaller solids loading. Moreover, the average particle velocity was proportional to superficial gas velocity and higher for denser ...


Performance Characterization Of Coagulation Pretreatment For Two Industrial Effluents, Jing Wan Aug 2017

Performance Characterization Of Coagulation Pretreatment For Two Industrial Effluents, Jing Wan

Electronic Thesis and Dissertation Repository

In this work, performances of coagulation and flocculation were tested for two different industrial effluents. Coagulation-Flocculation and activated carbon adsorption were applied for the remediation of oil sands process-affected water (OSPW), generated from oil sands operations in Alberta, Canada. OSPW is a complex mixture of suspended solids, various suspended and dissolved organic compounds. Alum and natural coagulant Opuntia ficus-indica (OFI) were used as the coagulants, and the process was optimized to improve the removal of turbidity and dissolved organic carbon (DOC). The maximum removal of 98% and 63% in turbidity and DOC from OSPW, respectively occurred at pH=6.32 ...


Regeneration Potential Of Activated Petroleum Coke For Application In Oil Sands Process-Affected Water, Sreejon Das Aug 2017

Regeneration Potential Of Activated Petroleum Coke For Application In Oil Sands Process-Affected Water, Sreejon Das

Electronic Thesis and Dissertation Repository

Cost effective regeneration of spent adsorbent is crucial for large scale application of adsorption as a viable separation process. While adsorption studies are abundant in literature, systematic and comprehensive regeneration studies are seldom reported in open literature. A proprietary activated carbon from petroleum coke was used for the removal of model naphthenic acids (NAs) and organic compounds from oil sands process-affected water (OSPW). A systematic and comprehensive study was conducted to regenerate the adsorbents. Methanol with aqueous NaOH (pH adjusted to around 12) was applied to regenerate the spent commercially available granular activated carbon (GAC) and activated petroleum-coke (APC). Optimization ...


The Effects Of Furfural On Biological Hydrogen Production In Batch And Microbial Electrolysis Cell, Hyeongu Yeo Oct 2016

The Effects Of Furfural On Biological Hydrogen Production In Batch And Microbial Electrolysis Cell, Hyeongu Yeo

Electronic Thesis and Dissertation Repository

Furfural inhibits biohydrogen production and numerous studies has been carried out on detoxification of furfural to enhance biofuel production. Electrochemical detoxification of furfural is a new approach to remove furfural without the degradation of sugars. However, there is limited information on the effects of the degradation products of furfural on biohydrogen production in batch tests and the impact of furfural on anode-respiring bacteria (ARB) in microbial electrolysis cells (MECs). This study investigated the effect of furfural and its derivatives, furfuryl alcohol (FFA) and 2-furoic acid (FA), on biohydrogen production. The impact of furfural on hydrogen production in MECs was also ...


Effect Of Local Bed Hydrodynamics On The Distribution Of Liquid In A Fluidized Bed, Lingchao Li Sep 2016

Effect Of Local Bed Hydrodynamics On The Distribution Of Liquid In A Fluidized Bed, Lingchao Li

Electronic Thesis and Dissertation Repository

In an industrial Fluid CokerTM, liquid bitumen is injected into a bed of hot coke particles through spray nozzles, grouped in several banks at different vertical positions. The main objective of this thesis is to determine whether significant improvements in liquid-solid contact could be achieved by optimizing the location of the spray nozzles. In the coker regions where bitumen is injected, the gas is a mixture of product vapors and steam. Steam introduced at different levels rises through the coker: the stripping steam is injected near the bottom, then the attrition steam above the stripper and finally the bitumen atomization ...


Biohydrogen And Biomethane Production From Lignocellulosic Biomass, Chinaza Okeoghene Akobi Aug 2016

Biohydrogen And Biomethane Production From Lignocellulosic Biomass, Chinaza Okeoghene Akobi

Electronic Thesis and Dissertation Repository

The main purpose of this study was to investigate the impact of furfural on mixed cultures during fermentative hydrogen production from lignocellulosic biomass. Small batch studies using synthetic lignocellulosic hydrolysate grown on mesophilic mixed cultures, revealed a threshold furfural concentration of greater than 1 g/L with enhancement to the yields (from the control) observed at 0.5 g/L furfural (at initial substrate-to–biomass (S°/X°) ratios of 0.5 and 1 gCOD/gVSS) and at both 0.5 g/L and 1 g/L furfural (at S°/X° of 2 and 4 gCOD/gVSS). This study was scaled-up ...


Study On Developments Of Processes For Powder Coatings, Shan Gao Aug 2016

Study On Developments Of Processes For Powder Coatings, Shan Gao

Electronic Thesis and Dissertation Repository

Powder coating, which utilizes polymer resin based powder, is a relatively young technology for decorative and protective purposes. It was first developed in the early 1950s and gradually grew into automotive finishes. Compared to conventional liquid coating, powder coating is an environmentally friendly technology, given that there is no emission of harmful solvent throughout the entire operating process. It is also much more efficient, economical and energy saving as a result of the capability to reuse all the powder. However, there are still some problems in the powder coating process limiting its application. This thesis focused on studying some key ...


Catalytic Conversion Of Fructose, Glucose And Industrial Grade Sugar Syrups To 5-Hydroxymethylfurfural, A Platform For Fuels And Chemicals, Sadra Souzanchi Aug 2016

Catalytic Conversion Of Fructose, Glucose And Industrial Grade Sugar Syrups To 5-Hydroxymethylfurfural, A Platform For Fuels And Chemicals, Sadra Souzanchi

Electronic Thesis and Dissertation Repository

5-hydroxymethylfurfural (HMF) as a versatile and polyfunctional compound derived from dehydration of biomass has attracted increasing attentions in research over the past decades. HMF is an important intermediate and platform chemical, which can be converted into different useful chemicals as well as the promising biofuels. It can be obtained from acid-catalyzed dehydration of different C6-based carbohydrates such as glucose, fructose, sucrose and cellulose.

In this thesis, a cost-effective process for catalytic conversion of simple sugars (particularly glucose and fructose) and industrial grade sugar syrups to HMF was studied in a novel biphasic continuous-flow tubular reactor using inexpensive heterogeneous ...


Microwave And Ultrasound Assisted Zeolitization Of Coal Fly Ash, Syed Salman Raza Bukhari Aug 2016

Microwave And Ultrasound Assisted Zeolitization Of Coal Fly Ash, Syed Salman Raza Bukhari

Electronic Thesis and Dissertation Repository

Coal fly ash (CFA) is a major bi-product of coal fired power plants and is a liability for coal power industry. Coal fly ash has been accumulating rapidly around the globe and has been known to be accident prone, resulting in $1.65 billion in clean-up costs and fines. Given the environmental damage CFA is capable of causing, it is a great interest for scientists to recycle this material. Utilization of novel energy such as microwave and ultrasound has been of research interest for the zeolitization of coal fly ash.

This research produced zeolites from CFA utilizing microwave and ultrasound ...


Fractionation Of Cornstalk Into Cellulose And Lignin For The Production Of Sodium Carboxymethyl Cellulose, Tao Shui Aug 2016

Fractionation Of Cornstalk Into Cellulose And Lignin For The Production Of Sodium Carboxymethyl Cellulose, Tao Shui

Electronic Thesis and Dissertation Repository

This thesis project aimed to fractionate cornstalk into cellulose and lignin, and utilize the crude cornstalk-derived cellulose for the production of sodium carboxymethyl cellulose and the lignin for the sybthesis of bio-based phenol-formaldehyde resole resins as wood adhesives. In this thesis work, cornstalk was efficiently fractionated into crude cellulose and crude lignin in mixed solvents of acetic acid, formic acid and water at a solid/agent ratio of 1:5 (g/mL) at 80-100 °C for 120-240 min. The best conditions for organosolv fractionation of cornstalk among the test conditions were determined as follows: mixed solvent of acetic acid/formic ...


Passive Acoustic Emissions In A V-Blender, Allison Crouter Jul 2016

Passive Acoustic Emissions In A V-Blender, Allison Crouter

Electronic Thesis and Dissertation Repository

The pharmaceutical manufacturing process consists of a number of batch steps; each step must be monitored and controlled to ensure quality standards are met. The development of process analytical technologies (PAT) can improve product monitoring with the aim of increasing efficiency, product quality and consistency and creating a better understanding of the manufacturing process.

This work investigates the feasibility of using passive acoustic emissions (PAE) to monitor particulates in a V-blender. An accelerometer was attached to the lid of a V-blender to measure vibrations from the tumbling solids. A wavelet filter removed the oscillations in the signals from the motion ...


Bed Agglomeration Behavior In A Bubbling Fluidized-Bed Combustor, Ehsan Ghiasi May 2016

Bed Agglomeration Behavior In A Bubbling Fluidized-Bed Combustor, Ehsan Ghiasi

Electronic Thesis and Dissertation Repository

Agglomeration is a major operational problem during the combustion of biomass containing a high amount of alkali compounds. The agglomerate formation is mainly due to the presence of alkali elements in biomass ashes that form low-melting compounds in the combustion.

In the first part of this project, the critical amount of liquid that would lead to a severe agglomeration/de-fluidization was studied and determined in a lab scale bubbling fluidized bed (BFB) heated at elevated temperatures. To simulate the biomass ashes, various percentages of KCl and KCl-K2SO4 compounds at eutectic composition were mixed with silica sand as ...