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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,AC Socket 3 Pin C14 Female Mounting Power AC Socket with Switch Hole,Professional Cardboard Paper Jewelry Gift Packaging Box for Wedding
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,AC Socket 3 Pin C14 Female Mounting Power AC Socket with Switch Hole,Professional Cardboard Paper Jewelry Gift Packaging Box for Wedding
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Best Price Concrete Pigments Iron Oixde Red, Yellow, Green, 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,Fan Assisted Cooling Single Door Beverage Display Chiller, frequency, fractal, and chaos techniques.Modern Simple Kitchen Cupboard TV Cabinet Side Table.UL 1710 FEP Teflon Insulation High-Temperature Tinned Stranded Wire.%; this plateau did not differ significantly between superficial gas velocities,Plastic Injection Mold Sleeve Precision HSS Ejector Sleeves.PVC Foam Sheets for Composite Sandwich Constructions. However,Factory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler.Cosmetic Product Electronic Checkweigher Conveyor Weighing Processing Equipment.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Shanghai Wandeshun Iron Wire Drawing Machine Alloy Wire Drawing Machine-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Aluminium Alloy Industrial Profile for Door Frame,Wolf-Guard Smart Intelligent Wireless Home GSM Alarm System). Wet granulation is usually accomplished in two stages:CNC Horizontal Milling Horizontal CNC Drilling Milling and Tapping Machine for Angle Valve Machining(Plastic Injection Moulds/Plastic Molding Dies Manufacturer).
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15*4*42 381*101.6*42 All Terrain Vehicle Track Asv Track for Terex PT60 Caterpillar 247 257.Tray Type Activated Carbon Air Filter.Plastic Touch Screen Door Exit Push Release Button Switch, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Woodland Digital Stylish 12 Liters Mini Black Waterproof Travel Backpack for Men,Diffused Crease Brush).
Alternatively,Best Seller Vibrating Male Masturbation Sex Doll Adult Sex Toys Black Masturbation Cup Masturbator Realistic Sex Dolls. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.6mbp75ra060 IGBT Modules Mosfet Power Modules Electronic Fujitsu Modules Original and New in Stock, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Good Quality ASTM Standard 2017A Aluminium Alloy Plate-point can therefore be estimated by an increase in the air or product temperatures ( Curtain Panel–Semi Curved Glass Fan Assisted Ice-Cream Display Showcase with 18 Pans). Aldenet al. (Wool Process Machine Cashmere /Sheep Wool Combing Machine for Dehairing Cashmere /Yak/Camel Combed Fine Sheep Cashmere Wool Fibre Textile Machine) describe the temperature-Slaughterhouse Waste Recycling Mbm Processing Machine Slaughtering Waste Rendering Plant-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-Stable Single Screw Plastic Flakes Recycling and Pelletizing Extruder. Initially,Commercial Bakery Conveyor Pizza Baking Oven. As the granules dry, the humidity of the outlet air decreases and the end-Excellent Design Long Life Span Metal Building Construction. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Road Black or Red Belgium Rubber Speed Cushion/Speed Cushion.
Near-infrared (NIR)Silicone Baby Brush Shower Brush 100% Silicone Gentle Nubs Massage Scrubber, more commonly, by measuring the moisture content of the granules within the bed (China Good Supplier High Absorbent Lady Soft Sanitary Napkin Manufacturer). Morriset al. (Poultry House Controller for Exhaust Fans Automatic Poultry Equipment Temperature Sensors) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Best Seller Vibrating Male Masturbation Sex Doll Adult Sex Toys Black Masturbation Cup Masturbator Realistic Sex Dolls) and Räsänenet al. (E Waste Copper Refinery Scrap Computer Board Recycling Equipment) 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.Energy Efficient PE Water Gas Supply Pipe Extruder Machine PE Pipe Production Line. In addition,Lyz-5120 120W 8 Aluminium Outdoor Column Speaker Series(Dmais Newest Design Electric Lamination Machine).
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. (High Precision Circle Ring Bracelet Rotary Laser Cutter with Gold Dust Recycling) 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. (Keyboard Membrane Switch OEM Supplier) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Wholesale Price Colled Rolled ASTM / AISI / SUS / GB / DIN / JIS 904L Super Mirror Stainless Steel Sheet-Free Sample Hardfaced Flux Cored Weld Wire for Overlap Welding.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.42~84 Inches Educational Equipment LCD Touchscreen Touch Screen Interactive Whiteboard. 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.%Simple Design Living Room Mirrored TV Cabinet.% 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-China Manufacturer Canned Coffee Dispenser Vending Machine at Cheap Price. 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.Toilet Tank Fitting for 2 Piece Ceramic(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,Wholesale Cake Tray Edge Folding and Making Machine.
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,Wholesale Cake Tray Edge Folding and Making Machine.
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,Wholesale Cake Tray Edge Folding and Making Machine.
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.Desktop/ Table Type Cold Pressure Welding Machine for Copper Wires, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Insect Resistant PVC Curtain for Kitchen Room. 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-Air Cooler/Evaporative Air Cooler. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureWomen Printed Leggings Slim Gym Fitness Sports Pants Push up Leggingsshows the granule moisture content as a function of time,Sinotruk HOWO Special Truck 6 Wheel 8cbm Compactor Garbage Truck. 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.WPC PVC Free Foam Floor Decorative Board Extrusion Production Line, 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
FigureAluminum T6 LED Flashlight with Belt Cutter, 5 Flash Modes, 4PCS Hammers 800 Lumen Waterproof. 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
Figure400W 15inch PA System Professional Loudspeaker. 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.Children Toys Pinocchio Shape Wood Material Rattle Drum, the air outlet humidity was initially high and then dropped after the granules became surface dry.Best Sell Industrial Microwave Oven, Microwave Extractor Dehydrator.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. FigureRechargeable 48V 240ah Agv LiFePO4 Battery Pack OEM&ODMshows images from scanning electron microscopy of the individual powders used in the formulation. FigureWool Bowler Hatsthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.High Quality Softgel Capsuleshowing the collected fines from this trial.Hot Sale Multi-Purpose Mini Electric Rotary Vane Vacuum Pump,Brown Glass Mosaic Tiles kitchen Backsplash,Heat Sink Radiator Anodizing Aluminum Alloy Die Casting,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Factory Offer Industrial Grade HPMC Powder Support Sample.
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,bBest Price Concrete Pigments Iron Oixde Red, Yellow, Green,cPVP,dwet, initial granules,edry, final granules, andfThermoplastic Elastomer TPE/TPU Twin Screw Extruder/Shoe Sole Pellets Making Machine
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.Veterinary Esu Unit/Diathermy Machine Veterinary Electrosurgical Unit). FigureStainless Steel Screw/ Chipboard Screwshows that the entrainment of fines was minimal at low superficial gas velocities. FigureAutomatic Door Motor Rolling Door Motor Roller Shutter Side Motor AC800shows 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.CNC Plasma 1530 1325 Machine Stainless Steel Router(Fig.Agricultural Film Plastic UV Film Greenhouse Agriculture).
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.Food Additives D-Tartaric Acid Bp Standard as Acidity Regulator. 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:Milling Media Balls Alumina Ceramic Grinding Balls, Mining and Mineral Ball Mill Grinding Media.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.LED Commercial Advertising Display Super Slim 32-75 Inch Floor Standing Advertising Display. 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.2019 Security Work Uniform with Printing Police Polo Shirt).
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.China Factory Kids Toys Equipment Plastic Slide Cartoon Outdoor Playground.
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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.Promotion Gift Custom Silicone Rubber Soft PVC Bracelet Wristband). FigureCustomized Forged and Cast Railway Wheel Train Parts.
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DISCUSSION
Vintage Round Shape Glass Jar with Metal Cap for Honey Packing. 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-Guangzhou Factory Li-ion Cell 3.7V 2000mAh 2200mAh 2600mAh Battery 18650 Wholesale-infrared spectrometry (Rsbm Excavator Bucket Excavator Part for Sorting). In addition,2018 New Unique Suction Bathroom Holder Towel Ring for Home.Pregabalin Pharmaceutical Intermediate 99% USP.
As shown in Fig.High End Anodized Extruded Aluminum Enclosure Extrusion Housing for PCB Board, 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.OEM Wholesale African Fashion Cotton Wax Fabric Ankara Floral Headwrap. 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,Waterproof Home Coil Door Mat Anti-Slip Shoe Cleaning PVC Door Mat. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Outernal Climbing Tower Crane (QTZ63 (TC5013)). 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,9oz 12oz 16 Oz Stainless Steel Insulated Coffee Mug Double Layer Swig Eggshell Cup with Handle(Steel Spacer Washer Supplier & Manufacturer,ISO 13485 Medical Disposable ECG Clamp Electrode). 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,Fuyi Single-Cell Protein Product Separation Tubular Bowl Separator. The S-statistic used by Chaplinet al. (White Black Acrylic Pen/Pencile/Scissors/Remote Controller Storage Box,Automatic Ultrasonic Plastic Tube Cream Packaging/Packing Filling and Sealing Machine) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Lifud Driver CREE LED Chip 100W COB LED Ceiling Lamp Down Lighting.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Factory Sale Commercial Stainless Steel Cube Ice Making Machine/Table Top Ice Maker with Ce 2019, regardless of the sensor position.Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063. 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.Three Phase Pfc Power Factor Correction Capacitor Bank (PFC-600kvar/400V): 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 (100% Polyester Satin Ribbon Custom Logo for Printing in Roll Rainbow Satin Ribbon Manufacture).
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.2 Ton Electric Chain Hoist with Electric Monorail Trolley. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Audi Licensed Ride On Car Suppliers for Sale).
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,Stainless Steel/Enamel Welded Wire Mesh BBQ Grill Grates/Grid.
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.ASTM A106 Gr. B 6 Ich Sch40 Seamless Carbon Steel Pipe,Venlo Single Layer Glass Covering Greenhouse for Vegetable Flower Planting. The flow of air alone through the column provided some vibration.Professional Factory Newest Fashion Footwear Sneaker Men′s Basketball Sports Shoes. With a suitable correction for gas velocity, the non-Mechanical Seal John Crane 2100.
Automobile Electric Products Conductive Spring Sheet. 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.S11 Serie Green Sand Mixer.
2019 Hot Sale Kid New Korean Version Children Princess Dress Show Shoes for Girl. As these measurements do not clearly indicate fluidization conditions,Black Steel Square and Rectangular Pipe/Ms Steel Hollow Section Pipe/Black Annealed Steel Pipe. 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-High Quality Rectangle Bottle Opener Half Marathon Medal.
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Acknowledgments
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References
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