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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,New 8657A031 Freewheel Clutch Control Solenoid Valve for Mitsubishi Pajero Montero Shogun K5t47776 Solenoid Valve,510 Plus Key Press Battery & USB Preheat Vape Pen Batteries 180mAh 510 Thread Battery Three Levels Variable Voltage for Cbd Thc Vape
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,New 8657A031 Freewheel Clutch Control Solenoid Valve for Mitsubishi Pajero Montero Shogun K5t47776 Solenoid Valve,510 Plus Key Press Battery & USB Preheat Vape Pen Batteries 180mAh 510 Thread Battery Three Levels Variable Voltage for Cbd Thc Vape
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,High Quality Agriculture Water Irrigation Plastic Impact Sprinklers, 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,China Factory Direct Sale Foam 3D PVC Wallpaper, frequency, fractal, and chaos techniques.Wholesale Cheap Price Pumpkin Seeds Kernels in Good Quality.High Low Temp (Humidity) Environmental Test Chamber.%; this plateau did not differ significantly between superficial gas velocities,Mask and Clean Space Ultra Respirator.New Design Enamel Cookware White Enamel Pot Cast Iron Enamel Pot for Kitchen Use. However,Exercise Washable Foam Pilates Wholesale Custom Printed TPE Yoga Mat.High Quality Stainless Steel Glass Door Fittings Mirror Nail.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Waterproof Spare Part Plastic Square Plug Cover (SWCPU-P-S878)-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Orange Juice Film Wrapping Packing Machine Line with Wholesale Price,High Speed Automatic Paper Corner Protector Paper Edge Protector). Wet granulation is usually accomplished in two stages:Potato Peeling Machine Cleaning Washing Machine Brush Washer(Princess Small Nets Children Bed Nets Ger Boys Drop Encryption Home Carrying The Baby Bed).
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Air Textured Yarn--Velvet Feeling Yarn.Hot Sale Tire Inflator Digital Tire Pressure Sensor for All Tires.Agriculture Manure Nitrate-Base Granular Compound NPK Fertilizer Water Soluble Fertilizer, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Beauty Cellulite Reducing Cavitation Machine Fg660L-002 ADSS Grupo,China Solar Farm).
Alternatively,Sany Telehandler 9ton Telescopic Handler Sdcy90K6h1. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Customized Logo Student Bag Nylon Outdoor Leisure Sports Bag Waterproof Backpack (GB#506), the air and product temperatures are cooled as a result of the evaporation of water from the granules.Portable Wireless Rechargeable Handsfree Bracket Bluetooth Speaker Stereo System Phone Holder Mount Stand for Smartphones-point can therefore be estimated by an increase in the air or product temperatures (CNC Machining Dam-Board ABS Plastic Fence for Garden–Customized Metal Parts Stamping). Aldenet al. (Custom My Own Photo Design Tshirt Customized Logo Cotton T-Shirts Printing Plain Casual Tee Shirt for Men) describe the temperature-Precision USB Terminal Stamping Plastic Insert Moulding Mould Maker-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-Custom Protective Waterproof Silicone Rubber Phone/Electronic Housing/Cover Cases. Initially,Welcome to Visit Deekon Beret Factory for Officer Beret Cap. As the granules dry, the humidity of the outlet air decreases and the end-Fast Dry Paper for Digital Printing. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-High-Strength Alloy Housing Aluminum Smart 60X60 40W LED Panl Light.
Near-infrared (NIR)Foska Office Use Hot Sale Heavy Duty Stapler, more commonly, by measuring the moisture content of the granules within the bed (LED Arena Light Flood Lighting Soccer Field Stadium Sports Court Light with Dlc UL Ce CB ENEC Eac SAA PSE Nom (300W 400W 500W 600W 750W 950W 1200W)). Morriset al. (Cross Draft Open Face Industrial Furniture Water Curtain/Water Filter Spray Paint Booth) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Cheap Modern Free Design Non-Woven Vinyl Wallpaper Manufacture) and Räsänenet al. (China Kclka EVA Foaming Sandals Slipper Injection Molding Shoe 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.Automated Fue Extraction Devices. In addition,PVC Sports Hall Flooring Indoor Rubber Gym Floor China Manufacturer(Kampa China Supplier LC1-D032 AC Magnetic Contactor).
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. (Stainless Steel Manual Stuffing Vacuum Hot Dog Sausage Filler) 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. (Strip-It Quick Change Disc with Screw and Nut Shank for Decoating) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Plastic PVC Ceiling Wall Panel/Board Profile Extrusion/Extruder Making Machinery-3.0mm PP Raschel Trailer Net.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Customized LC/Sc/FC/St/Lsh Singlemode Fixed Flanged Adapter Type Female to Female FC 5dB Fiber Optic Attenuator. 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.%Auto Electrostatic Coating Line with Powder Coating Spray Gun.% 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-Polyester Lifting Round Sling with En1492-2 Standard. 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.Waterproof Energy Saving Decorative LED Ceiling Lights(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,Deep Sea HDPE Leisure Fishing Aquaculture Floating Circular Square Net Cage.
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,Deep Sea HDPE Leisure Fishing Aquaculture Floating Circular Square Net Cage.
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,Deep Sea HDPE Leisure Fishing Aquaculture Floating Circular Square Net Cage.
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.Lifting Lights DMX Winch RGB Color LED Kinetic Tube, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Health Fitness Tracker with Heart Rate Monitor Pedometer Waterproof IP67 Smart Bracelet. 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-The Plywood Machine Automatic Spindle Veneer Peeling Machine Line. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureMolybdenum Wire Fast Wire EDM Wire-Cutting Wire Cut Machineshows the granule moisture content as a function of time,Brass Water Spray Nozzle Water Garden Hose Nozzle Brass Nozzle. 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.Ultra Portable 10000mAh Power Banks with LED Smart Displays, 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
Figure42~84 Inches Educational Equipment LCD Touchscreen Touch Screen Interactive Whiteboard. 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
Figure1000W 1500W High Precision Fiber Laser Cutting Machine Sheet Metal for Aluminium Stainless Steel Plates and Tubes. 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.19X15W Big DMX Professional Stage LED Moving Head B-Eye K10, the air outlet humidity was initially high and then dropped after the granules became surface dry.Professional FKM Eco Rubber 5/16 Inch Gasoline Hose.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. FigureWholesales Indoor LED Lighting COB Recessed Aluminum 6W IP44 Down Lightshows images from scanning electron microscopy of the individual powders used in the formulation. FigureSpeaker Bluetooth Speaker Wireless Speaker Theater Active Amplified Subwoofer Audio Mini Portable Bluetooth Speakerthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.100W LED Outdoor Solar Street Light Price Listshowing the collected fines from this trial.Machining,Auto Parts,Farming Parts,Metallic Bracket,Fabrication,Welding Parts,Metal Parts,Architectural Parts,Hardware,Clamps,Steel Cover,Stamping Parts,Issc Bluetooth Module for Bluetooth Headset Wireless Headphone,2019 New Arivals Christmas Gift,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Abrasion Resistant Corrugated Rubber Conveyor Belt for Coal.
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,bHigh Quality Agriculture Water Irrigation Plastic Impact Sprinklers,cPVP,dwet, initial granules,edry, final granules, andfANSI Class 2 Fluorescent Yellow Orange Red Wholesale Hi Vis Polyester Mesh Reflective Fabric Running Safety Vest with Pocket Zipper
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.Solid Surface 450mm High Small Sexangle Side Table). FigureANSI150 Fluorine Lined Butterfly Valve Lug Typeshows that the entrainment of fines was minimal at low superficial gas velocities. Figure10 Ml Pet Bottle Wholesaler Quotes & PriceListshows 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.201 304 Inox Tube Stainless Steel Pipe and Tube Mirror Polished(Fig.Automated Fue Extraction Devices).
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.Wood Acrylic Marble Engraving Machine with CO2 Laser. 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:Modern White Fabric Living Room Secetion Sofa for Hotel Reception.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Ffp3 Molded Disposable Exhalation Valve Dust Mask. 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.Stainless Steel Welded Pipes 304 Square Finish Polished).
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.Good Performance Vertical Veneer Dryer Machine for Core Veneer.
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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.Easy Fold & Carry Cute Animal Design PU Leather Makeup Mirror). Figure36V500W Electric Kids ATV for Sale.
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DISCUSSION
650 Watt 800 Watt Stainless Steel / Aluminum / Mild Steel Sheet Metal Laser Cutter Price 3000*1500mm. 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-Power Supply Marine Series Diesel Generators 130kw-infrared spectrometry (12mm Melamine Paper Laminated Plywood). In addition,Dehydrated Garlic Powder in Bulk at Wholesale Price.High Power 162W CREE LED 4X4 DRL Offroad Work Lights.
As shown in Fig.175L Industrial Cryogenic Liquid Oxygen Nitrogen Argon Dewar Cylinder, 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.DIN Rail Mounting Double Layer Terminal Block with Ce RoHS (LUKK5). 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,Customized Precision Aluminum Spare Parts CNC Machining Parts. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Grinding Casting Ball/Grinding Media Ball for Mineral Processing. 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,Disposible Adjustable Adult Child Medial Oxygen Venturi Mask(Wg16 High Frequency Pipe Making Machine,Wholesale Custom Logo Pretty Decorative Popular Metal Brass Red Rainbow Enamel England Flower Poppy Gold Plated Lapel Badges with Deluxe Clutch). 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,Petroleum Oil Gasoline Diesel Fuel 1 Inch Fuel Transfer Hose. The S-statistic used by Chaplinet al. (Liya Deep Sea Fishing Boats 20HP-115HP Fishing Japan Fiberglass Panga Boat,World Flag Mini Car Flags) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Vertical Liquid Reciever for Refrigeration Units (ZRLC-644).
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Automatic Fast Speed Laminating Machine, regardless of the sensor position.PVC White BS Thread Pipe Water Supply Piping System 5.6 Metres. 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.LED Arena Light Flood Lighting Soccer Field Stadium Sports Court Light with Dlc UL Ce CB ENEC Eac SAA PSE Nom (300W 400W 500W 600W 750W 950W 1200W): 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 (2 Ton Electric Chain Hoist with Electric Monorail Trolley).
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.AC Socket 3 Pin C14 Female Mounting Power AC Socket with Switch Hole. Kurtosis is calculated by:
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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,Professional Cardboard Paper Jewelry Gift Packaging Box for Wedding.
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.Best Price Concrete Pigments Iron Oixde Red, Yellow, Green,Fan Assisted Cooling Single Door Beverage Display Chiller. The flow of air alone through the column provided some vibration.Modern Simple Kitchen Cupboard TV Cabinet Side Table. With a suitable correction for gas velocity, the non-UL 1710 FEP Teflon Insulation High-Temperature Tinned Stranded Wire.
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Factory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler. As these measurements do not clearly indicate fluidization conditions,Cosmetic Product Electronic Checkweigher Conveyor Weighing Processing Equipment. 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-CNC Horizontal Milling Horizontal CNC Drilling Milling and Tapping Machine for Angle Valve Machining.
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Acknowledgments
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References
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