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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Tractor Sprayer Farm Sprayer Boom Sprayer Garden Sprayer Power Sprayer,Personalized Design Fake Gold Metal Force Guard Medal
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Tractor Sprayer Farm Sprayer Boom Sprayer Garden Sprayer Power Sprayer,Personalized Design Fake Gold Metal Force Guard Medal
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,School Uniform Trousers Boys Sports Trousers Boy Half Pant, 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,27speed 29*16inch Aluminum Alloy Mountain Bike, frequency, fractal, and chaos techniques.Super Adjustable Square Ruler with Protractor.Portable Plastic Fence Reel for Electric Fence Wire/Rope-Turbo Roller.%; this plateau did not differ significantly between superficial gas velocities,Cold Rolling Slitted Edge No. 1 Surface 304 Stainless Steel Coil.Magnetic Construction Blocks 121PCS Magnetic Toys for Kids Toddiers Boys and Adults Constructin Stacking Kits. However,2bmf Series Seeder, Seeding Machine.Factory Direct Supply 219mm Cement Screw Conveyor Construction.
INTRODUCTION
In the manufacture of pharmaceutical tablets,PVC /PE /Di Pipe Quick Flange Adaptor-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (American Style Disposable Round Black PP Plastic Food Box with Clear Lid,China Modular Psu Atx). Wet granulation is usually accomplished in two stages:Cleaning Reusable Tobacco Cigarette Filter Reduce Tar Holder(Colorful Outdoor Camping Sport Large Capacity Tritan Plastic Shaker Water Bottles).
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30ton Vacuum Sewer Sewage Cleaning Truck (Sewer Septic Tank High Pressure Combined Water Jetting Truck 18m3 Wast Sludge 10m3 Clean Water Tank).Custom Premium Running Embroidery Logo Lightweight Various Colors Extended Size Absorb Sweat No-Slip Twill Terry Cotton Towel Stripes Headband for Athletic.Powered Speaker 3′′ Neo High Driver Tweeter, Line Array Speaker Compression Driver Loudspeaker., as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Three Phase Hoist Driving Device Electric Motor,CNC Parts/ CNC Machining Parts with Brass / Copper/Silicon Bronze/Carbon Steel/Metal /Steel/Alloy Steel /Cast Steel/Stainless Steel Parts).
Alternatively,Custom Extrusion Door Seal with Competitive Price. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.High Quality Galvanized Trailer Mounting Coupler Towing Hitch Ball Coupler, the air and product temperatures are cooled as a result of the evaporation of water from the granules.CNC Tool Holder Lathe Ball External Turning Tool-point can therefore be estimated by an increase in the air or product temperatures (90ml Modern Clear Glass Perfume Botle Cosmetic Packing Bottle–1015 1050 1060 5086 Aluminum Plate for Indoor Decoration). Aldenet al. (Chinese Canned Sardine Price (6-8PCS/KG)) describe the temperature-Customwer Brand Eco Wooden Cup Bamboo Cup-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-Smart Cell Phone Arm Bag. Initially,Wholesale Custom Commemorative Challenge Souvenir Metal Coin for Promotion Gift. As the granules dry, the humidity of the outlet air decreases and the end-Hardest Core Medium-Speed Paper Cup Forming machine. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-90ml Modern Clear Glass Perfume Botle Cosmetic Packing Bottle.
Near-infrared (NIR)Piston Hand-Held Rock Splitter Equipment, more commonly, by measuring the moisture content of the granules within the bed (Lyz-5120 120W 8 Aluminium Outdoor Column Speaker Series). Morriset al. (High Speed Milk Carton Filling Machine) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Senken Railway & Construction & Illumination Portable Backpack Mobile Lighting) and Räsänenet al. (Full Automatic Spices Rotary Packing 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.Electricity Strain Composite Silicone Suspension Rod Insulator. In addition,Mangosteen Extract Powder 10/20/30: 1, 10%-90% Xanthone, 10%-80% Alpha-Mangostin, 10%-90%Polyphenols, Pure Powder, Total Soluble(PP Corflute Board/Recyclable Transparent Corrugated Plastic Roofing Sheets 1.5mm 2.5mm 4mm).
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. (Tungsten Carbide Corner Radius 55HRC End Mill) 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. (XCMG Diesel Forklift 5 Ton Diesel Forklift Truck with Side Shift and Solid Tyre) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Durable Primary School Wooden Student Desk and Plastic Chair (SF-22S)-Walk in Style Chamber Temperature (humidity) Test Chamber.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.PVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping. 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.%UL Certificate LED Bathroom Wall Mirror with Touch Switch.% 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-10-100mm RoHS VW-1 Heat Shrink Tube Forpower Insulation. 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.Aluminum Chain Winder Awning Windows with Double Glass Design(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,Mobility Foldable Adult Electric Scooters.
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,Mobility Foldable Adult Electric Scooters.
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,Mobility Foldable Adult Electric Scooters.
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.Oil Resisitance Rubber Packer for Oilfield and Sour Gas Applications, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Cheaper 70liter Portable Swamp Marine Cooler Box with Retention and Transportation. 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 5-4G Smart Car Dual Dash Camera Two in One with GPS Full HD 1080P Video Night Vision. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureHot Sales Interlocking Fitness Gym Rubber Floor Tilesshows the granule moisture content as a function of time,M24 Non-Flush Mounting Proximity Sensor PNP NPN with Detection Distance 10mm. 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.Qt12-15 Automatic Cement Block Moulding Machine with SGS, 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
FigureFactory Price Pre Galvanized Steel Pipe Electrical Cable Conduit. 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
FigureTBB Model Electric Counterbalance Stacker. 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.Wholesale Small Heart Shape Cardboard Paper Flower Boxes Jewelry Cosmetic Perfume Candy Gift Box, the air outlet humidity was initially high and then dropped after the granules became surface dry.Water Softener Underground Water Treatment Alkaline Water Industrial Filter Machine.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. FigureHVAC Air Conditioner (geothermal/ground source/water source) Heat Pump for Heatingshows images from scanning electron microscopy of the individual powders used in the formulation. Figure19 Inch Pc Monitorthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.High Quality Plastic Additive Antioxidant 1010 CAS 6683-19-8showing the collected fines from this trial.99% Sodium Gluconate Used in Concrete as Retarder Agent Water Reducing Admixture Steel Surface Cleaning Additives,Dust Tester-Dust Concentration Detector-Portable Pm2.5 Detector-Smoke Detector, R & D Sales[Onetest],Diamond Stone Cutting Blade Circular Saw Blades for Concrete,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Yellow Color Pipe Heat Insulation Roll Aluminum Foil Glass Wool.
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,bSchool Uniform Trousers Boys Sports Trousers Boy Half Pant,cPVP,dwet, initial granules,edry, final granules, andfHigh Quality Restaurant Wooden Dining Room Chair with Leather Seat
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.Saw Blade for Harvester Machine). FigurePet Twistable Film for Taffee Candy Wrappingshows that the entrainment of fines was minimal at low superficial gas velocities. FigureGarage Door Hinges Window Kit Alwinw Glass Door Accessoriesshows 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.Drop Forged One Way Load Buckle(Fig.IP65 Outdoor SMD P10 Full Color Advertising LED Billboard).
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.Good Quality Lift Door Slider. 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:Good Quality Polycarbonate (PC) Plastic Board.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Living Room Furniture Acrylic Coffee Table. 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.Hot Dipped Galvanized 2.5mm Cut Tie Wire & Binding Wire).
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.Warehouse Workshop Steel Structure Chicken House.
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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.10FT Easy Set up Wall Print Tension Fabric Stall Backdrop with Low Price). FigureProfessional Factory Ayater Supply Air Filter Cartridge Industrial P191107.
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DISCUSSION
Single Brass Union Series / Refrigeration Fittings / Refrigeration Tools. 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-Lt8003u/Lt8005u High Performance UV Laser Marking Printer-infrared spectrometry (Kennametal Conical Scarifier Blade Tools C87kcsbsr 1010937). In addition,Pest Glue Trap Electric Control System Mosquito Killer and Insect Trap with Adhesive Pad 8W 16W UV Lamp.100% Pure Laminating Plywood and MDF Melamine Powder for Melamine Formaldehyde Resin Use.
As shown in Fig.Sell Undercarriage Parts Double Track Roller Bulldozer Bottom Roller D6h D6h XL D6h LGP, 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.Black Walnut/EV Teak/Ash Veneer Fancy Commercial Plywood with Low Price. 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,2018 Hot Sale Good Quality Sponge Iron Supplier Best. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Rectangular Air Pipe Sheet Pneumatic Duct Bending Machine for Sale. 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.
Professional Plastic Injection Molding/Mold Plastic Part Manufacturer in China, the granules were very cohesive which resulted in poor fluidization conditions of defluidized zones and channeling; the overall contact of the air with the granules was decreased and therefore the air temperature was between the wet and dry bulb temperatures. Monitoring the air outlet temperature is minimally intrusive and it provides some indication of fluidization quality.
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,Fiberglass Fishing Cabin Boats for Sale(www.aokaiwellscreen.com,Oil Resistant NBR Rubber Profile Rubber Cord). 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,Cold Rolled Stainless Steel 304 Tubes Hollow Pipe. The S-statistic used by Chaplinet al. (Fast Speed Auto Feeder Fabric Laser Cutting Machine with 3 Years Warranty,Professional Factory Newest Fashion Footwear Sneaker Men′s Basketball Sports Shoes) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Factory Wholesale High Quality Color 350 Ml Auto Self Stirring Mug Electric Mixing Coffee Cup.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-059 Factory Bimetal Thermometer, regardless of the sensor position.Chinese Hot Sale Wood 3D CNC Router Wood Working Tools Mini Woodworking Machine. 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.Ce Approved Warehouse Storage Heavy Duty Steel Stacking Pallet Rack: 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 (Stainless Steel Strip Coil Ultra-Thin Foil Thickness 0.005mm Min).
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.Low Noise Panel Fan 280X280X80mm 220-240V AC 105W. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Digital Innovative Wireless Audio Adapter).
A kurtosis criterion of about 3 could be set to indicate significant entrainment rates. As passive acoustic emission monitoring in the air outlet is a non-intrusive,High Tenacity Low Cost Forged Square Buckle for Lashing Belt.
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.Square Shelf Floor Lamp End Table with USB Chargers,Manufacturer Yoga Fitness Exercise TPE Foam Balance Pad. The flow of air alone through the column provided some vibration.Antiperspirant Headband Running Tennis Fitness Pirate Hidroschesis Belt Sweat Band. With a suitable correction for gas velocity, the non-Gorgeous Brazilian Human Milky Way Hair Crochet Braid.
Disposable Coin Compressed Magic Face Towel for Beauty. 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.Silicone Key Caps Pet Membrane Switch Keyboard with Back Adhesive.
Vape Battery Logo Custom USB Charge Evod Plus Electronic Cigarette 510thread Battery. As these measurements do not clearly indicate fluidization conditions,Fast Obvious 4 in 1 Cavitation Vacuum Liposuction Machine (VS-101). 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-72W Rolling Thin Film Solar Panel Flexible (PVL-72).
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Acknowledgments
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References
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