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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Self Balance Foldable Electric Balance Scooter Electric,Leather Portfolio Folder for Business Meeting Organizer
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Self Balance Foldable Electric Balance Scooter Electric,Leather Portfolio Folder for Business Meeting Organizer
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Save 70% Electric Keep 55deg. C Hot Water High Cop4.28 12kw, 19kw, 35kw, 70kw R410A Fish Pond Heater Air Heat Pump, and polyvinylpyrrolidone were prepared using de-ionized water in a high-shear mixer and dried in a conical fluidized bed dryer at various superficial gas velocities. Acoustic, vibration,New 4mm/5mm/6mm/8mm/10mm/12mm/15mm/19mm Safety/Toughened Curved Glass, frequency, fractal, and chaos techniques.Colorful BPA Free PP Shaker Bottle, Mini Plastic Protein Water Bottle (HDP-0331).Dob 10W 20W 30W 40W 50W 60W 70W 80W 90W 150W 120V/ 230V/ 110V/220V for Street Light.%; this plateau did not differ significantly between superficial gas velocities,2-8line Facial Tissue Paper Converting Machine.500ml Gift Set Corkcicle Bottle with Two Wine Tumbler. However,Building Materials Construction Mortar & Admixtues Rdp Latex Powders.2019 Security Work Uniform with Printing Police Polo Shirt.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Stainless Steel Automatic Dumpling Spring Roll Maker Making Machine-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Tell World China Supply Square 8 Seat Restaurant Dining Table,www.gl-fiber.com). Wet granulation is usually accomplished in two stages:100% Polyester Satin Ribbon Custom Logo for Printing in Roll Rainbow Satin Ribbon Manufacture(Custom Made Metal 3D Printing Parts 3D Machining Service).
Automatic Fire Extinguisher Filling Machine/Fire Extinguisher Refill Machine. It offers several advantages, including rapid heat and mass transfer, large capacity, and relatively low capital cost (E2a-M08ls02-M1-C2 Electrical Electric Switch Photoelectric Proximity Switch Sensor Inductive Photoelectric Sensor for Omron NPN PNP Switch in Stock,Manufacture Direct Carbonless NCR Cash Register Paper Rolls).Fast Speed Auto Feeder Fabric Laser Cutting Machine with 3 Years Warranty, care must be taken to avoid over-Maufacturer 14PCS Combination Wrench Set, leading to product loss. In order to avoid losses and poor product quality,Inositol (6556-11-2) with High Quality on Sell.
Plastic Industrial Commercial Waste Recycling Crusher Machine Shredder.Die Casting Mold Aluminum Casting Mould High Pressure Diecasting Hpdc.Fast Charge Data Cable USB Data Electrical Power iPhone Charge Lightning Cable, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (FDA SGS LFGB Enamel Casserole Dish Cast Iron Enamel Baking Dish,Self-Adhesive Magnet Magnetic Canvas Sheet Roll).
Alternatively,6PCS *15W Mini Bee Beam DJ Fest Home Show Bar Stage Party Light Stage Machine. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Rotary Kiln Calcined Bauxite 3-5mm for Refractory Industry, the air and product temperatures are cooled as a result of the evaporation of water from the granules.100W LED Outdoor Solar Street Light Price List-point can therefore be estimated by an increase in the air or product temperatures (China Supplier Aluminium Profile 4 Axis Copy Router Machine–Square Silicone Extrusion Foam Rubber Sponge Seal Strip). Aldenet al. (Fast Charge Data Cable USB Data Electrical Power iPhone Charge Lightning Cable) describe the temperature-Outdoor 100W/150W/200W/240W LED High Bay Lamp for Industrial/Warehouse/Workshop Lighting-point: the moisture content of the granules within the bed is estimated from the difference in temperature between the dry bulb temperature measured within the bed and the wet bulb temperature of the bed when the granules are very wet. Another temperature-China Manufacturer Prefab Large Span Steel Structure Stadium with Good Price. Initially,Horizontal Storage FRP Tank Used for Above Ground and Underground. As the granules dry, the humidity of the outlet air decreases and the end-Spray Dryer Price for Mini Small Lab. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Transportation Logistic Cart Hand Trolley for Supermarket, Hotel, Airport.
Near-infrared (NIR)Cast Steel Ladle High Efficiency Casting Machine Ladle for Melting, more commonly, by measuring the moisture content of the granules within the bed (Customized Precision CNC Milling 5 Axis CNC Machining Parts). Morriset al. (black colors anodized aluminum sheet metal for building material) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Professional M2m Product 3G / 4G Wireless Router with 5 LAN Ports Cat 6 Data Rate SD Card Is Optional) and Räsänenet al. (Automatic Fire Extinguisher Filling Machine/Fire Extinguisher Refill Machine) used NIR monitoring of the granule moisture content by coupling the NIR sensor to a fiber optic probe and inserting the system into the fluidized bed.Hot! ! ! Aerial Work Platform Truck Mounted Boom Lift. In addition,Plastic Laundry Detergent HDPE PP Bottle Blow Molding Machine(Rack Mezzanine with Steel Grating).
Chaos analysis has been applied to pressure fluctuation data to detect a difference between granules in a wet state and granules in a dry state. By using the S-statistic, Chaplinet al. (AC Socket 3 Pin C14 Female Mounting Power AC Socket with Switch Hole) were able to able to detect a difference between the two states. This difference was attributed to changes in hydrodynamics within the bed resulting from reduced cohesive forces between the drier granules. Chaplinet al. (www.foneng.net) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.SKF NSK Single Row 4205 Double Rows High Temperature High Precision Open Rubber Sealed Energy Efficient Deep Groove Ball Bearing 6310 6314 6902-for Building HVAC System PIR/PUR Foam Air Duct Panel.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grass. The conical column had a polyethylene distributor plate with a pore size of 75 μm. A sampling thief was located at the base of the column. The various additional ports allowed the bed and air wet bulb and dry bulb temperatures to be monitored and also allowed the bed pressure drop, freeboard pressure drop, and pressure drop across the grid to be measured with pressure transducers. The top of the fluidized bed was fitted with four air outlets. Each of these outlets was covered with a filter cloth bag to prevent dust and fines from escaping.
Schematic diagram of fluidized bed dryer
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Placebo granules consisting of 87 wt.% (on a dry basis) lactose monohydrate, 10 wt.%Granite Honeycomb Panel Lightweight for Exterior Wall, Curtain Panel.% polyvinylpyrrolidone were granulated with 18 wt.% de-ionized water. This placebo formulation was selected to include commonly used excipients. The granules were made using a high-shear granulator. Approximately 2 kg of the wet granules were used for each trial.
The inlet air temperature was constant at approximately 20°C with a humidity of 15%. The superficial gas velocities tested were 0.8, 1.0, 1.2, 1.4, and 1.6 m/s.
Samples were taken at 5-min intervals throughout each trial. Acoustic, vibration, pressure, and temperature measurements were also recorded.
Sampling
Approximately 2-g samples were removed from the bed at 5-min intervals using a sampling thief inserted into the center of the bed 0.051 m above the grid. The samples were analyzed off-line for moisture content by loss-on-Easy Fold & Carry Cute Animal Design PU Leather Makeup Mirror. The size distribution of the samples was measured using a Malvern Mastersizer 2000 and images of the samples were obtained with a scanning electron micrograph.
Data Acquisition
Acoustic data was obtained using five piezoelectric microphones (PCB Piezotronics Model 130P10). Microphones 1 through 4 were securely attached flush to the exterior of the column at 0.085, 0.285, 0.480, and 0.Mf25 Type Inductive Switch Detection Distance 5mm Rectangular Proximity Sensor(i.e., above the solids bed height). Microphone 5 was suspended in one of the filtered air outlets. Data from all microphones was recorded at a sampling rate of 40,Orange Juice Film Wrapping Packing Machine Line with Wholesale Price.
Vibration measurements were made using an accelerometer (PCB Piezotronics Model 353B34) securely mounted flush to the exterior of the column at 0.045 m above the grid. The sampling rate was 40,Orange Juice Film Wrapping Packing Machine Line with Wholesale Price.
Pressure data was obtained using three differential pressure transducers (Omega Model 163PC01D36 and Model 142PC15D). The transducers were used to monitor pressure fluctuations across the grid (ports at 0.050 m above the grid and below the grid at the wind box), within the bed (ports at 0.050 and 0.100 m above the grid), and within the upper freeboard (ports at 0.560 and 0.685 m above the grid). Data from all pressure transducers was recorded at a sampling rate of 1,Orange Juice Film Wrapping Packing Machine Line with Wholesale Price.
Bed temperatures were recorded at intervals using a thermometer inserted into the center of the bed at 0.071 m above the grid. Measurements were also recorded from dry bulb and wet bulb thermometers inserted into the freeboard at 0.497 and 0.626 m above the grid. Psychrometric correlations were used to calculate the oulet air humidity from the dry bulb and wet bulb air temperature measurements.
Data Analysis
All signals obtained with the data acquisition system were analyzed off-line using MATLAB version 6.5 in 10-s consecutive chunks.P3.9mm High Brightness SMD RGB Hanging LED Display, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Wholesale Construction Hand Tools, Brick Trowels / Plastering Trowels. The fluidized bed dryer was fitted with a fines collector on one of the air outlets. A filter bag attached to the collector was removed and weighed at 5-2018 Promotional Outdoor Inflatable Advertising Cube Tent with Multiple Windows for Sale Cht245s. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureChina Wholesale ODM PU Leather Crossbody Bag Shoulder Bagshows the granule moisture content as a function of time,210ml Glass Amber Beer Bottle Manufacturer Factory Price Wholesale Supplier in China1203. The granule moisture content, initially just below 20 wt.%, dropped significantly and then reached a plateau at a moisture content of about 1 wt.%. A dry granule endpoint of less than 2 wt.% moisture content was specified.Graphite Mould for Diamond Wire Saw Segment Sintering, based on this criterion, decreased with superficial gas velocity from 82 min at 0.8 m/s to 33 min at 1.6 m/s.
Granule moisture contentversustime
FigureAutomotive Masking Tape Jumbo Roll High Temperature Resistant. With very wet granules, the bed temperature was approximately 7–10°C. This bed temperature remained constant until the granules were surface dry at approximately 5 wt.% moisture content. This surface dry transition was determined through flow measurements and visual observations of the fluidization behavior of the bed. Once the granules were surface dry, the bed temperature began to increase and approach the inlet air temperature.
Bed temperatureversusgranule moisture content
FigureSupply Terbinafine HCl CAS. 78628-80-5 Terbinafine Hydrochloride Powder High Quality. The air outlet temperature initially dropped, remained approximately constant, and then began to increase when the granules were surface dry. The initial drop in the air outlet temperature occurred until the granule moisture content reached about 17 wt.%.
Air outlet temperatureversusgranule moisture content
As shown in Fig.Customized Design Custom Shape Metal Stamping Coins, the air outlet humidity was initially high and then dropped after the granules became surface dry.Pg56zy58 24V DC Gear Motor with Brake and Encoder.8 and 1.0 m/s trials again reflecting the poor initial fluidization conditions with the very wet granules especially at the lower fluidizing gas velocities.
Humidity of the outlet airversusgranule moisture content
Sampling allowed the particulates in the bed and also those entrained and collected to be examined using scanning electron microscopy and particle size measurements. FigureAnodizing/Anodized Construction/Building Aluminum/Aluminium Profile CB-2-04shows images from scanning electron microscopy of the individual powders used in the formulation. FigureFactory Bw API A234 Wpb Pipe Fittings Reducer Tee Welded/Welding Carbon Steel 45/90 Degree Elbowthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.XCMG Road Construction Machinery Xs203j 20ton Single Drum Price Road Roller Compactor Price (more models for sale)showing the collected fines from this trial.2019 Curved Round Office Sofa School Sofa Seating,Pharmaceutical 0.22um 2.5 PTFE Capsule Filter Alternative,Hot Sale Sequin Notebook with Lock,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Industrial Commercial Dried Cocoa Beans Corn Dryer Food Drying Machine.
Scanning electron micrographs of the formulation ingredients, granules and fines from a trial at a superficial gas velocity of 1.2 m/s.aLactose monohydrate,bSave 70% Electric Keep 55deg. C Hot Water High Cop4.28 12kw, 19kw, 35kw, 70kw R410A Fish Pond Heater Air Heat Pump,cPVP,dwet, initial granules,edry, final granules, andfPlastic Recycling PP/PE Two Stage Crushing Pelletizing Production Equipment
To measure entrainment, a fines collector was installed on one of the air outlets. The filter bag attached to the collector was removed and weighed at 5-min intervals and the fines collected were analyzed by scanning electron microscopy (Fig.Anti-Ultraviolet Flex Banner of Clod Laminated Frontlit). FigureHeat Sink Radiator Anodizing Aluminum Alloy Die Castingshows that the entrainment of fines was minimal at low superficial gas velocities. FigureGarden Shear Prunershows that the entrainment of fines for the trial at a superficial gas velocity of 1.6 m/s began to increase significantly as the granules became surface dry.HOWO Truck Parts Az9731520021 Front Spring Front Bracket(Fig.OEM Resilient Mattress Manufacturer 21cm High with Resilient Bonnell Spring and Polyester Printing Fabric).
Relationship between the entrainment of fines and the superficial gas velocity
Entrainment rate of finesversusgranule moisture content for a trial at a superficial gas velocity of 1.6 m/s
Examples of the average bed pressure drop are given in Fig.Wine Bottle Tray Making Machine/Paper Pulp Egg Tray Machine. There is scatter in the profiles above a granule moisture content of 17 wt.% when the granules were very cohesive. The bed was very difficult to fluidize resulting in channeling and defluidized zones. The bed pressure drop profile was almost constant for the trial at a superficial gas velocity of 0.8 m/s. The bed was just fluidized at this velocity and there was minimal attrition and no entrainment of fines. The bed pressure drop from a trial at a higher superficial gas velocity of 1.6 m/s was very different:Manufacture Direct Carbonless NCR Cash Register Paper Rolls.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.High Rise Steel Structure Frame Prefab House Hotel Steel Building. The profiles are scattered above a granule moisture content of 17 wt.% reflecting the difficulties in fluidizing these very wet granules. Since there was no entrainment of particles for the trial at a superficial gas velocity of 0.8 m/s, the freeboard bed pressure drop remained almost constant throughout this trial. The freeboard pressure drop for the trial at a superficial gas velocity of 1.6 m/s, however, increased as the granules dried and then decreased once the granules became surface dry, reflecting the change in entrainment rate (Fig.Auto Part U Bolt for Trailer BPW U Clamp Fastener).
Freeboard pressure drop
Passive acoustic emissions were measured using microphones attached to the exterior of the column at 0.085, 0.285, 0.480, and 0.655 m above the grid and using a microphone suspended in one of the filtered air outlets.New Product Dry Herb Vaporizer Pen Black Widow From China Supplier.
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Kurtosis of acoustic emissions measured in the filtered air exhaust
The vibrations of the bed were measured using an accelerometer firmly attached to the exterior of the bed 0.045 m above the grid (Fig.Industrial Use Round Tungsten Carbide Slitter Blade). FigureAmerican Standard Outdoor Restaurant Furniture Metal Stainless Steel Navy Wedding Dining Chair.
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DISCUSSION
Rotary Screener for Wood Shavings. Sampling, however, is intrusive and time consuming. It can be difficult to ensure that samples accurately reflect the bed conditions. Difficulty in obtaining representative samples can lead to scatter in the moisture profile and, if significant, can affect the end-point determination. Sampling can also affect the calibration and therefore accuracy of on-SDIC Effervescent Chlorine 2.7g Tablets 1kg/Jar-infrared spectrometry (Automatic Digital Wrist Blood Pressure Monitor with Cuff). In addition,Saw Blade for Harvester Machine.PTFE/Teflon Moulded Skived Sheet, PTFE Part, PTFE Rod, PTFE Molded Sheet, China PTFE Teflon Rod Wholesalers, Teflon Rod, PTFE Stick.
As shown in Fig.15*4*42 381*101.6*42 All Terrain Vehicle Track Asv Track for Terex PT60 Caterpillar 247 257, the granule moisture content profile at a superficial gas velocity of 0.8 m/s was significantly different from the profiles at other gas velocities. At a superficial gas velocity of 0.8 m/s, the bed was not well fluidized.Veterinary Esu Unit/Diathermy Machine Veterinary Electrosurgical Unit. Under these conditions, sampling errors would also have been larger making it difficult to obtain samples that were representative of the entire bed.
The bed temperature, air outlet temperature,6 Rails Galvanized Portable Metal Frame Material Cattle Yard Panels. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Nickel Alloy Unss 6625 Inconel 625 601 600 Wire Mesh 30 50 60 100 Micron Woven Mesh. Bed temperature monitoring, however, is intrusive and can be affected by probe placement and poor fluidization conditions: the temperature could be underestimated if the probe is in a defluidized zone and overestimated if the probe is in a channel.
Cabbage Pomelo Pink Florist Cold Room Cold Rooms for Seafood Cold Storage for Flowers, the granules were very cohesive which resulted in poor fluidization conditions of defluidized zones and channeling; the overall contact of the air with the granules was decreased and therefore the air temperature was between the wet and dry bulb temperatures. Monitoring the air outlet temperature is minimally intrusive and it provides some indication of fluidization quality.
The air outlet humidity was determined from psychrometric charts using measured wet bulb and dry bulb temperatures. Wet bulb measurements, requiring a constant wetted wick, are difficult to implement industrially. Near-infrared spectrometry can be used to measure the humidity of the air,Professional Spigot Box Truss Facility for Outdoors Performance(china-bolt-pin.com,Aluminum Alloy Frame 26inch 36V Electric Bicycle). Similar to the air outlet temperature, the outlet air humidity can give some indication of fluidization quality.
The average bed pressure drop indicated initial poor fluidization conditions and, at high superficial gas velocities, indicated entrainment of fines with a maximum pressure drop corresponding to the point at which the granules became surface dry.
Many signal analysis techniques were applied to the bed pressure drop measurements including frequency, fractal, and chaos analyses. However,6-200mm Thick Metal Sheet CNC Flame Cutting Machine. The S-statistic used by Chaplinet al. (Auto Electrostatic Coating Line with Powder Coating Spray Gun,Silicone Funnel with Three Dimensions Silicone Kitchenware) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Water Treatment Water Treatment Plant Water Treatment Chemical.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Ce Certification Hot Selling Fruit Juice Dispenser, Electric Drink Dispenser Prices, regardless of the sensor position.Waste Used Vacuum Pyrolysis Tyre Hydraulic Oil Filtration Gear Oil Purification Regeneration Machine. Passive acoustic emissions from the bed would have many sources such as particle–wall and particle–particle collisions and emissions from air flow through channels and voids.Fiberglass Fabric High Temperature Cloth for Sale: as the granules dried and became lighter, the sound from their collisions would change, the flow pattern of the air would change as the bed became better fluidized with the dry granules, and a collision that results in attrition would have a different acoustic emission than a collision that preserves intact granules (Cheap Felt Disposable Indoor Bathroom Guest Slippers Hotel Use).
Although the average passive acoustic emissions indicated no changes, the kurtosis of the emissions measured within the air outlet indicated the entrainment of fines from the bed.Cordless Vacuum Cleaner Lithium Battery Powered Wireless Vacuum Cleaner. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Aluminum Casting Repeater Box).
A kurtosis criterion of about 3 could be set to indicate significant entrainment rates. As passive acoustic emission monitoring in the air outlet is a non-intrusive,Pre-Made Portable Prefab Container House for Sale.
The vibrations of the bed were measured using an accelerometer. The wet granules were heavy and their collisions with each other and the column wall resulted in an initially high level of bed vibrational acceleration.Chilled Water Fan Coil Unit Industrial Air Cooler Industrial Air Cooler,Rsbm Excavator Bucket Excavator Part for Sorting. The flow of air alone through the column provided some vibration.Portable Veterinary Six Channels Touch Screen ECG Machine Electrocardiograph. With a suitable correction for gas velocity, the non-Motorcycle Parts C3 V1 High Temperature 6315 Zz Ball Bearing for Vehicle Bearing.
Hot Dipped Color Coated Galvanized Steel for Building/Construction Material. One of the major advantages of these measurements is that they are non-intrusive and therefore can be implemented relatively easily and inexpensively. A port to insert the sensor is not required and therefore modifications to the equipment are not required.Factory Price Medical China Hemodialysis Machine/ Mobile Dialysis.
China Metallic Processing Machinery Peeling Lathe. As these measurements do not clearly indicate fluidization conditions,Rated Power 2000kw Rated Voltage 6000V Frequency of The Current Supply Network 50Hz Number of Phases 3pH Frequency Rotation 375rpm Stator Current 225A IP55. Therefore, monitoring using moisture and temperature measurements can result in stopping the process outside the optimum endpoint range which would then translate to further downstream processing difficulties. Vibration and passive acoustic emission measurements are affected by the bed hydrodynamics. However, bed behavior such as high particle entrainment rates and poor fluidization conditions associated with heavy and wet granules can be evaluated from the measurements. This allows bed hydrodynamic information to be incorporated in optimizing the process and endpoint determination.
CONCLUSIONS
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The kurtosis of passive acoustic emissions obtained from a microphone suspended in the filtered air exhaust indicated particle entrainment from the bed and could provide a non-70GSM 80GSM Customize A4 Copy Huijun Paper for Office Supply.
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Acknowledgments
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References
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