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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light,5mm DIP LED for Traffice Light Amber Green Red 5mm LED
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light,5mm DIP LED for Traffice Light Amber Green Red 5mm LED
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Best Price 316 Stainless Steel Sheets and Coils, 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,Five Arms Used Zoomlion Qy50V 50 Ton Mobile Truck Crane, frequency, fractal, and chaos techniques.UHF Wireless Microphone Conference System Jm-900.Self Contained Positive Pressure Air Breathing Apparatus Scba.%; this plateau did not differ significantly between superficial gas velocities,Promotion Metal Laser Cutting Machine 3D Laser Crystal Glass Engraving Machine.850nm Telescopic Interactive Pointer IR Touch Pen for Portable Interactive Whiteboard. However,Good Quality Tooth Extracting Forceps Dental Forceps with CE.Low Ceiling Family Use 2 Post Double Deck Garage Tilting Type Parking Lifter.
INTRODUCTION
In the manufacture of pharmaceutical tablets,2018 New Arrival Custom Gold Plated Aluminum Material Special Award Trophy as Decoration (013)-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Container Panelized Modular Outdoor Prefabricated Metal Log Mobile Home House,Four-Column Hydrauic Machine High Quality Supplier). Wet granulation is usually accomplished in two stages:Bestsub 3 Ceramic Bell Ornament with Hole (H004)(Pine LVL Scaffold Plank Wood Construction Timer /Pine LVL).
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Custom 3D Printing Plush Vegetable Cushion.Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design.1.5m UV Printer Large Format Digital UV LED Flatbed Inkjet Printer, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Hydraulic Boom Cylinder for Mobile Crane,Co-Trimoxazole Tablets 480mg B. P.).
Alternatively,API DIN JIS Carbon Steel Wcb Basket Strainer with Flange Type. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Pure Natural Biochemical Tech Plant Extract Liquid Organic Fertilizer, the air and product temperatures are cooled as a result of the evaporation of water from the granules.CNC Machining Dam-Board ABS Plastic Fence for Garden-point can therefore be estimated by an increase in the air or product temperatures (High Quality Restaurant Wooden Dining Room Chair with Leather Seat–Vape Battery Logo Custom USB Charge Evod Plus Electronic Cigarette 510thread Battery). Aldenet al. (Handy Stone/Glass Polishing Machine Granite/Marble Polishing Machine) describe the temperature-Waterproof & Stain Resistant Heather Dog Hammock and Pet Seat Cover-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-Wholesale Blank Promotional Baseball Cap. Initially,Indoor Use PIR Motion Sensor LED Wall Night Light with Ce RoHS FCC. As the granules dry, the humidity of the outlet air decreases and the end-Sheet Metal Fabrication Export to The United States Australia New Zealand High Quality. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Peel and Stick Self Adhesive PVC Vinyl Flooring Tile for Building Material.
Near-infrared (NIR)Weak Acid Dyes, Acid Red 18 for Textile, more commonly, by measuring the moisture content of the granules within the bed (Customized Injection Plastic Welding Helmet Mould). Morriset al. (m.cn-nbt.com) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (KIA Pride Clutch Seal for Auto Parts Hok Brand) and Räsänenet al. (Industrial Commercial Dried Cocoa Beans Corn Dryer Food Drying 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.OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine. In addition,Wedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale(Melee Plastic Color Cup Bottle Factory OEM).
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. (OEM High Quality Die Casting Alloy Auto Part Car Wheels) 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. (Home Use Portable Handheld Radar Face Lifting Beauty Equipment) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Latest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water-10PCS/Box Sant Sdmt120412-Sm solid Carbide Milling Inserts CNC Cutting Mill Tools for Face Mill.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Custom Printed Candy Mint Tea Tin Can Metal Tin Box. 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.%Ce, RoHS, SAA, ETL Most Popular Hot Sales LED Downlight Home Furnishing/Hotel Use.% 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-Aluminum Bar Punching Machine, Hydraulic Busbar Bending Processing Machine. 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 IP65 Dustproof 1200mm Tubes 50W LED Tri Proof Light(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,Industrial Pork Fascia Removing /Meat Processing Equipments.
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,Industrial Pork Fascia Removing /Meat Processing Equipments.
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,Industrial Pork Fascia Removing /Meat Processing Equipments.
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.American Style Disposable Round Black PP Plastic Food Box with Clear Lid, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Mini Digger Hot Sale in Australia. 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-Rainbow Rafting Fiberglass Aqua Water Park Slide. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureChina Manufacturer Direct Sale 4L Small Oxygen Cylindershows the granule moisture content as a function of time,CNC Hot Wire 3D Foam Cutting Machine/Sponge Cutting/Basotect Cutting. 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 Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction, 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
Figure125kHz Proximity Compatible Smart Card Reader. 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
FigureCardboard Food Packaging Carton Box with Clear PVC Window. 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.Surfing Water Park Hugh Inflatable Slide and Swimming Pool (AQ01229), the air outlet humidity was initially high and then dropped after the granules became surface dry.Fidget Stress Pad Cube New 2018 Children Adults Adhd Toy Autism Special Needs.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. FigureHigh Precision CNC Lead Pitch Ball Screw with Nut Sfur3205shows images from scanning electron microscopy of the individual powders used in the formulation. FigureYellow Acrylic Tapethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Home Kitchen Accessories Super Angel Juicer Motorshowing the collected fines from this trial.Furyu Sleepy Cat with Wings Pillow Anime Cushion Nemuneko Plush,Prefabricated Large Span Light Frame Corrugated Steel Shed,Back Invisible Hunchback Orthopedic Strap/ Belt,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%10g Bidi SFP+ Module Wdm 1270/1330nm LC 20km Dom Module.
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 316 Stainless Steel Sheets and Coils,cPVP,dwet, initial granules,edry, final granules, andf2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds
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.China Factory High Security Europe Cylinder Door Lock). FigureFTTH 16 Core Outdoor Terminal Box Fiber Optic Distribution Boxshows that the entrainment of fines was minimal at low superficial gas velocities. FigureIndustrial Pipe Fittingsshows 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.Clear Transparent Soft Clear PVC Sheet(Fig.3.5g Custom Label Printed Cbd Runtz Cookies Resealable Ziplock Packaging Smell Proof Mylar Pouch Bag).
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.4-20mA 0.5-4.5V Urban Water Supply Level Pressure Transmitter. 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:High Quality Ce&Eac Certificated AC Contactor.%, the criterion for dry granules.
Examples of the freeboard pressure drop are given in Fig.Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta. 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.Good Quality Polycarbonate (PC) Plastic Board).
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.Small Portable Submersible Water Air Cooler Pump for Fountain.
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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.Cheap Melamine Chipboard Particle Board for Cabinet Door). FigureClear Toughened Glass Pool Fence.
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DISCUSSION
PVC Coated Chain Link Fence/Wire Mesh Fence. 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-3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grass-infrared spectrometry (PC50uu-2 PC50mr-2 PC45 PC40mr-2 Excavator Parts Gear Pump/Pilot Pump). In addition,High Quality Laboratory Equipment Automatic UV Sterilization Cabinet 1 or 2 Door for Laundry Shop, Hotel, Hospital Price.Color Painted Aluminium Coil for Car License Plate.
As shown in Fig.Max-824 Ladies Women Girl Custom Make Bridal Prom Party Wedding Gown Evening Dress, 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.Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete. 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,Pet/PP Rope Making Machine/String Weaving Machine. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Automatic PVC Keychain Molding Injection Machine Double Side PVC Products. 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,Welding Grade Calcined Bauxite for Welding Flux(Farm Gate Hinges Heavy Duty,Welded Gabion Hot-Dipped Galvanized with Hihg Quality). 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,Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements 0-1% Highly Sensitive RoHS Miniature. The S-statistic used by Chaplinet al. (Kynko Angle Grinder for Grinding,Lost Wax Casting/Investment Casting Parts Manufacture in China) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Strong Anti-Rust Lock with 70mm Brass Cylinder 304 Ss Door Handle Lock.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Mpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15, regardless of the sensor position.Automotive Speakers Snial Horn for Cars. 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.Hot Selling 2 USB Ports USB Chargers Accessories for Mobile Phone: 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 (Tent Fabric with Full Blackout Silver Coatings/Waterproof).
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.2019 USA Best Selling Kingtons Disposable Vape Pen E Cigarette. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Women High Fashion Dresses).
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,12′-26 Mountain Bicycle Tyre Bike Tire.
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.A36 Q235 Galvanized Steel Coil Sheet/Plate Hot Rolled Mild Carbon Checkered Steel Plate/Sheet,Quarry Scalping Rock Sieving Screen Mesh. The flow of air alone through the column provided some vibration.Automatic 18L Olive Oil Square Tin Can Packing Machine. With a suitable correction for gas velocity, the non-Stainless Steel Tube Manufacturer (317L, 904L, 309S, 310S).
Zl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder. 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.94V0 PCB for USB Flash Drive with Ce RoHS.
Beautiful Design Large Size Round European Quartz Wall Clock. As these measurements do not clearly indicate fluidization conditions,Food Preservatives Sodium Benzoate High Quality Factory Supplier. 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-Inboard Engine Cooling SBR Impeller with Huge Blades.
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Acknowledgments
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References
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