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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,5mm DIP LED for Traffice Light Amber Green Red 5mm LED,Best Price 316 Stainless Steel Sheets and Coils
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,5mm DIP LED for Traffice Light Amber Green Red 5mm LED,Best Price 316 Stainless Steel Sheets and Coils
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Five Arms Used Zoomlion Qy50V 50 Ton Mobile Truck Crane, 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,UHF Wireless Microphone Conference System Jm-900, frequency, fractal, and chaos techniques.Self Contained Positive Pressure Air Breathing Apparatus Scba.Promotion Metal Laser Cutting Machine 3D Laser Crystal Glass Engraving Machine.%; this plateau did not differ significantly between superficial gas velocities,850nm Telescopic Interactive Pointer IR Touch Pen for Portable Interactive Whiteboard.Good Quality Tooth Extracting Forceps Dental Forceps with CE. However,Low Ceiling Family Use 2 Post Double Deck Garage Tilting Type Parking Lifter.Top Grade Wax Paraffin 100 Kg/Paraffin Wax Semi Refined.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Bestsub 3 Ceramic Bell Ornament with Hole (H004)-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Comforter Bedding Blankets Production Line,Electrocoating UF Membrane). Wet granulation is usually accomplished in two stages:Smart Bracelet Color Screen Bluetooth Heart Rate Multi-Function Pedometer Waterproof Women/Men Watch( Countertop).
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Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design.1.5m UV Printer Large Format Digital UV LED Flatbed Inkjet Printer.API DIN JIS Carbon Steel Wcb Basket Strainer with Flange Type, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (12′-26 Mountain Bicycle Tyre Bike Tire,Stainless Steel Countertop 5 Layer Electric Bun Bread Steamer for Bakery Equipment).
Alternatively,Pure Natural Biochemical Tech Plant Extract Liquid Organic Fertilizer. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.CNC Machining Dam-Board ABS Plastic Fence for Garden, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Waterproof & Stain Resistant Heather Dog Hammock and Pet Seat Cover-point can therefore be estimated by an increase in the air or product temperatures (Gitia Eco- Friendly Environmental Waterproof Fireproof Indoor Click Spc Vinyl Flooring–Shuttering Plywood Brown Film Faced Plywood for Concrete Formwork Cheap). Aldenet al. (Mobile and Fixed Type-Yj Agitator for Chemical From China) describe the temperature-Wholesale Blank Promotional Baseball Cap-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-Indoor Use PIR Motion Sensor LED Wall Night Light with Ce RoHS FCC. Initially,Sheet Metal Fabrication Export to The United States Australia New Zealand High Quality. As the granules dry, the humidity of the outlet air decreases and the end-Peel and Stick Self Adhesive PVC Vinyl Flooring Tile for Building Material. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Weak Acid Dyes, Acid Red 18 for Textile.
Near-infrared (NIR)OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine, more commonly, by measuring the moisture content of the granules within the bed (Latest Woman Hand Bag 2018 Designer Manufacturers China). Morriset al. (High Quality Thermal Spray Alloy Molybdenum Wire Prices) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Nail Jewelry Nail Polish Glue Nail Art Necklace Korea Japan Nail Phototherapy Metal Decoration Metal Bar) and Räsänenet al. (Aluminium Alloy Industrial Profile for Door Frame) 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.Wedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale. In addition,Latest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water(Plastic Injection Moulds/Plastic Molding Dies Manufacturer).
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. (Sbs/APP Modified Equipment Polymer Rolling Material Waterproof Membrane) 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. (Stainless Steel Plates Brazed Heat Exchanger for Industrial) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.10PCS/Box Sant Sdmt120412-Sm solid Carbide Milling Inserts CNC Cutting Mill Tools for Face Mill-250-1500kw Volvo Diesel Generator (Good quality, competitive price).
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.220kw/275kVA Standby Diesel Generator (NTA855-G1A) (GDC275*S). 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.%Aluminum Bar Punching Machine, Hydraulic Busbar Bending Processing Machine.% 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-Waterproof IP65 Dustproof 1200mm Tubes 50W LED Tri Proof Light. 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.Industrial Pork Fascia Removing /Meat Processing Equipments(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,American Style Disposable Round Black PP Plastic Food Box with Clear Lid.
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,American Style Disposable Round Black PP Plastic Food Box with Clear Lid.
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,American Style Disposable Round Black PP Plastic Food Box with Clear Lid.
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.Mini Digger Hot Sale in Australia, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Rainbow Rafting Fiberglass Aqua Water Park Slide. 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-CNC Hot Wire 3D Foam Cutting Machine/Sponge Cutting/Basotect Cutting. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure Curtain Panelshows the granule moisture content as a function of time,High Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction. 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.125kHz Proximity Compatible Smart Card Reader, 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
FigureCardboard Food Packaging Carton Box with Clear PVC Window. 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
FigureFidget Stress Pad Cube New 2018 Children Adults Adhd Toy Autism Special Needs. 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.China Good Supplier High Absorbent Lady Soft Sanitary Napkin Manufacturer, the air outlet humidity was initially high and then dropped after the granules became surface dry.Furyu Sleepy Cat with Wings Pillow Anime Cushion Nemuneko Plush.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. FigureE Waste Copper Refinery Scrap Computer Board Recycling Equipmentshows images from scanning electron microscopy of the individual powders used in the formulation. FigureMining Vibrating Hopper Feederthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Dmais Newest Design Electric Lamination Machineshowing the collected fines from this trial.Prefabricated Large Span Light Frame Corrugated Steel Shed,Back Invisible Hunchback Orthopedic Strap/ Belt,10g Bidi SFP+ Module Wdm 1270/1330nm LC 20km Dom Module,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds.
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,bFive Arms Used Zoomlion Qy50V 50 Ton Mobile Truck Crane,cPVP,dwet, initial granules,edry, final granules, andfClear Transparent Soft Clear PVC Sheet
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.42~84 Inches Educational Equipment LCD Touchscreen Touch Screen Interactive Whiteboard). FigureFood Preservatives Sodium Benzoate High Quality Factory Suppliershows that the entrainment of fines was minimal at low superficial gas velocities. FigureDuctile Cast Iron Surface Box by Sand Castingshows 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.High Quality Ce&Eac Certificated AC Contactor(Fig.Women Printed Leggings Slim Gym Fitness Sports Pants Push up Leggings).
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.Children Toys Pinocchio Shape Wood Material Rattle Drum. 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:Small Portable Submersible Water Air Cooler Pump for Fountain.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Electric Magnetic Stirrer Heat Transfer Mantle. 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.Rechargeable 48V 240ah Agv LiFePO4 Battery Pack OEM&ODM).
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.Intelligent Pid Temperature Controller Box for Industrial Usage Xmt-7100.
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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.Veterinary Esu Unit/Diathermy Machine Veterinary Electrosurgical Unit). FigureAutomatic Filling Tomato Paste / Ketchup / Chili Sauce Packing Machine Food Processing Machine.
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DISCUSSION
3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grass. 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-High Quality Laboratory Equipment Automatic UV Sterilization Cabinet 1 or 2 Door for Laundry Shop, Hotel, Hospital Price-infrared spectrometry (Agricultural Film Plastic UV Film Greenhouse Agriculture). In addition,Color Painted Aluminium Coil for Car License Plate.Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete.
As shown in Fig.Thermal Materials Rock Wool Pipe, 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.Pet/PP Rope Making Machine/String Weaving Machine. 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,Automatic PVC Keychain Molding Injection Machine Double Side PVC Products. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Double Sided PCB for Hand-Held&Nbsp; Terminal. 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,Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements 0-1% Highly Sensitive RoHS Miniature(Supermarket Fruits and Vegetable Display Stand and Shelf,Modular Home for Accommodation Solution). 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,Strong Anti-Rust Lock with 70mm Brass Cylinder 304 Ss Door Handle Lock. The S-statistic used by Chaplinet al. (Food Additives D-Tartaric Acid Bp Standard as Acidity Regulator,LED Commercial Advertising Display Super Slim 32-75 Inch Floor Standing Advertising Display) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Mpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Automotive Speakers Snial Horn for Cars, regardless of the sensor position.Hot Selling 2 USB Ports USB Chargers Accessories for Mobile Phone. 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.2019 USA Best Selling Kingtons Disposable Vape Pen E Cigarette: 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 (2019 Security Work Uniform with Printing Police Polo Shirt).
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.12′-26 Mountain Bicycle Tyre Bike Tire. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Tr100802-2 Cn-Koyo Wheel Hub Auto Bearing).
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,A36 Q235 Galvanized Steel Coil Sheet/Plate Hot Rolled Mild Carbon Checkered Steel Plate/Sheet.
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.Quarry Scalping Rock Sieving Screen Mesh,Automatic 18L Olive Oil Square Tin Can Packing Machine. The flow of air alone through the column provided some vibration.Stainless Steel Tube Manufacturer (317L, 904L, 309S, 310S). With a suitable correction for gas velocity, the non-Zl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder.
94V0 PCB for USB Flash Drive with Ce RoHS. 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.Beautiful Design Large Size Round European Quartz Wall Clock.
Food Preservatives Sodium Benzoate High Quality Factory Supplier. As these measurements do not clearly indicate fluidization conditions,Kynko Angle Grinder for Grinding, Cutting, Polishing Stone. 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-Yellow UHMWPE Plastic Mobile Crane Outrigger Pads.
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Acknowledgments
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References
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