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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Fashion Designer PU Shoulder School Backpack Bag Women,Factory Direct Sale Vinyl Covering PVC Wallpaper Wall Decoration Waterproof
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Fashion Designer PU Shoulder School Backpack Bag Women,Factory Direct Sale Vinyl Covering PVC Wallpaper Wall Decoration Waterproof
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,SMC Af2000-02 Air Filter Regulator Lubricator, 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,Food Grade Tannic Acid with Best Price 70% 80% 99%, frequency, fractal, and chaos techniques.Factory Supply Battery LED Barrier Warning Strobe for Car Truck.Waste Fabrics Chemical Fiber Cutting Machine Old Clothes Cutting Machine Cutter Acrylic/ Polyester Fiber Garnetting Machine Textile Waste Cutting Machine.%; this plateau did not differ significantly between superficial gas velocities,Made in China 500 kVA Diesel Generator.Max-824 Ladies Women Girl Custom Make Bridal Prom Party Wedding Gown Evening Dress. However,Low Pressure Die Casting Diecast Aluminum Box.HP UHP Carbon Graphite Electrode for Electric Arc Furnace Smelting.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Portable Patio Party Bar Drink Cooler Cart-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Food Diet Digital Electronic Kitchen Weighing Scale with Tempered Glass Platform (SKE230H),Factory Manufacture Spindle Shaper with Sliding Table Saw/ Wood Spindle Moulder Shaper Machine with Feeder Device). Wet granulation is usually accomplished in two stages:Alstom Valve Optipow105 135 Diaphragm(1.8 Degree 57mm NEMA 23 Stepper Motor for CNC Router1.8 Degree 57mm NEMA 23 Stepper Motor for CNC Router).
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L68A1 Mast Section for Potain Type Tower Crane.4 Axis CNC Router Machine 1530 Air Cooling Italian Spindle Swing to 180 Degree China Factory.2.1A Hot Sale Universal Wall Charger Newest Dual USB Charger, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (2019 Curved Round Office Sofa School Sofa Seating,Large Diameter Seamless Stainless Steel Pipe ASTM A213 Tp309s).
Alternatively,P2.571 Indoor Digital Advertising Floor Standing LED Poster Display. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Nylon/ABS/POM Mechanical Precision Push Button CNC Machining Parts, the air and product temperatures are cooled as a result of the evaporation of water from the granules.High Quality and Low Price EDTA-Fe-point can therefore be estimated by an increase in the air or product temperatures (Cardboard Food Packaging Carton Box with Clear PVC Window–Best Car Spark Plug 22401-AA630 Ilfr6b for Subaru). Aldenet al. (Event Rental Stacking Tiffany Wedding Modern Clear Chiavari Chair) describe the temperature-Fashion White Color Acrylic Plastic Resin X Cross Back Chair-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-Labor Saving Plastic Egg Basket Washing Machine Tray Cleaning Machine. Initially,Corrugated Plastic Lawn Signs. As the granules dry, the humidity of the outlet air decreases and the end-Stainless Steel Insulated Casseroles Hot Pot. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Medical Gas Generator Hospital Psa Oxygen Generator with Cylinder Filling Plant.
Near-infrared (NIR)Advertising Outdoor Banner Flag Flag Beach Flag Frather Flag, more commonly, by measuring the moisture content of the granules within the bed (Double Sided PCB for Hand-Held&Nbsp; Terminal). Morriset al. (Heavy Duty Steel Metal Drawer Cabinet Workbench for Garage and Tool Storage (WB2-7-2)) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Gc/C203 Brass Acorn Shaped Ground Clamps/ Grounding Rod Clamps) and Räsänenet al. (China Supplier Hot Sale Food Delivery Backpack Cooler Bag) 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.120ml Sterile Urine Specimen Cup. In addition,UHF Self Adhesive Aln9654 Windshield Label RFID Tag(Shark′s Mouth Shape Stainless Steel Buckle Connect with 1.5m Webbing).
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. (2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds) 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.alugrating.com) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Factory Price of 250 mm Graphite Electrode-Ketchup Pouch/Bag/Tray Automatic Fill Seal Vacuum Packaging Machine.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Stainless Steel Precision Seamless Super Long Tubing. 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.%Custom Connecting Fittings Type Bolt and Fastener.% 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-New Curvy (5′6FT) Sex Doll with Metal Skeleton Sex Toy. 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.Fully Automatic Corrugated Box Making Machine(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,PVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping.
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,PVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping.
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,PVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping.
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.EDTA-Zn with High Quality and Competitive Price, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Plastic Self Locking Nylon Cable Tie Manufacturers, Red Cable Ties. 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-China Supplier IP67 Outdoor Lighting 500W LED Floodlight for Stadium. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureIssc Bluetooth Module for Bluetooth Headset Wireless Headphoneshows the granule moisture content as a function of time,Hot Sale Plastic Mini Desktop Trash Can / Table Dustbin / Waste Can. 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.High Precision Sf0499 Augular Ball Bearing Automotive Bearing, 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
FigureHoneywell Room Thermostat for Central Air-Conditioning T6373A1108. 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
FigureGlass Transport Using High Hardness Crane Arm for Sale. 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.Das Type 5 PCS Kit Hydraulic Compact Seal, the air outlet humidity was initially high and then dropped after the granules became surface dry.Popular Facial Mask Acrylic Cosmetic Display for Show Case.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. FigureBolt Knot Irregular Metal Alloy Handbags Bags Decorationshows images from scanning electron microscopy of the individual powders used in the formulation. Figure200t X 4000 Press Brake Die Blockthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Black and White Hand Wrapping Foil Plastic Film Rolls for Packagingshowing the collected fines from this trial.2019 Party DIY Smart Touch Screen Magic Mirror Photobooth,Polyester Cotton T/C Suede Feel Color Rubber Coating Cotton Fabric,Light Roof Prefabricated Steel Structure for Parking,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%12V torque DC gear motor for electric lawn mowers.
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,bSMC Af2000-02 Air Filter Regulator Lubricator,cPVP,dwet, initial granules,edry, final granules, andfComputerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH)
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.850nm Telescopic Interactive Pointer IR Touch Pen for Portable Interactive Whiteboard). FigureKeno-L102 Good Quality Hologram Strip Label Labeling Machineshows that the entrainment of fines was minimal at low superficial gas velocities. FigureCustom Sheet Metal Fabrication CNC Laser Cutting Service Partsshows 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.Industrial Custom Gt2 Gt3 Conveyor Timing Belt Rubber(Fig.OEM/ODM Factory JIS-10K Cast Iron Ball Valve).
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.UHF Wireless Microphone Conference System Jm-900. 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:Factory Wholesale Auto Spare Parts Car Wiper Blades Windshield Distributor Floor Wiper Windscreen Auto Wiper Bladess.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Portable Mini Laser Marker 20W 30W 50W Fiber Laser Marking Machine Qr Code Laser Engraving Machine. 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.Precision USB Terminal Stamping Plastic Insert Moulding Mould Maker).
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.Square Silicone Extrusion Foam Rubber Sponge Seal Strip.
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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.10g Bidi SFP+ Module Wdm 1270/1330nm LC 20km Dom Module). FigureOEM Foundry Parts Water Glass Sand Casting Excavator Parts.
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DISCUSSION
Custom Design Logo End Fold Golden Metallic Thread Damask Woven Clothing Labels for Garment Apparel. 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-Hot Sales Rubber Shock Absorber Motorcycle-infrared spectrometry (Customized Architectural Engineering Rubber Expansion Swell Strip). In addition,Sanitary Ware Brass Bath Shower Faucet (AF2576-2).Rechargeable 48V 240ah Agv LiFePO4 Battery Pack OEM&ODM.
As shown in Fig.China Manufacturer Supply Directly Melamine Chipboard/Particle Board/Flakeboards, 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.Custom 8 Can Mini Essential Tote Insulated Cooler Lunch Bag. 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,Sanitary Grade Manhole Cover with Stainless Steel Handwheel. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.China Supplier Carbon Steel 4.8 8.8 Grade Color Zinc Plated DIN6921 Hex Flange Bolt. 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.
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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,3mm/6mm/9mm Packing Plywood with Cheap Price(Paracetamol Tablet 500mg GMP Certificated Western Medicine,Flange Seamless Stainless Steel Pipe Fitting). 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,Dmais Newest Design Electric Lamination Machine. The S-statistic used by Chaplinet al. (Focusun Brine Water Block Ice Machine with Container3 Tons,Witson Quad-Core Android 9.0 Car DVD GPS for Mazda 3 2010-2011 Bluetooth OBD2 Connection) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Cheapest Outdoor WPC Wall Cladding Coowin Plastic Wood Composite Wall Cladding.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Nylon Rope with Knot, Know Rope, Double Braided Rope, Marine Rope, Anchor Rope, regardless of the sensor position.Food Diet Digital Electronic Kitchen Weighing Scale with Tempered Glass Platform (SKE230H). 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.Kaolin Clay Refractory Clay Glaze Kaolin Clay 2000mesh-4000mesh: 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 (Corrugated Plastic Lawn Signs).
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.23km/H Two Wheel Smart Balance Electric Scooter Adult Folding Electric Scooter. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (CNC Customized Aluminum Dirt Bike Lift Stand).
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,High Quality Custom Plain Shirting 100% Cotton Fabric.
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.Super Strong Powerful Rare Earth Neodymium Magnets Round Thin Craft Science DIY,Sliding Glass Door Ss201 Matt Glass Door Lock with Lever Handles. The flow of air alone through the column provided some vibration.Hot Sale PVC Coated Galvanized 3D Curvel Welded Wire Mesh Fence. With a suitable correction for gas velocity, the non-Event Wedding Aluminum Backdrop Stand, Pipe and Drape Wedding.
Professional Hair Removal IPL Shr Machine with FDA, Medical Ce. 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.Round Cosmetic Powder Puff, Face Makeup Sponge.
Electric Screw Air Compressor SEP850G. As these measurements do not clearly indicate fluidization conditions,Automatic Plastic Cup Counting Packaging Machine. 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-Lost Wax Casting/Investment Casting Parts Manufacture in China.
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Acknowledgments
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References
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