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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Fiberglass Fabric High Temperature Cloth for Sale,Cordless Vacuum Cleaner Lithium Battery Powered Wireless Vacuum Cleaner
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Fiberglass Fabric High Temperature Cloth for Sale,Cordless Vacuum Cleaner Lithium Battery Powered Wireless Vacuum Cleaner
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Pre-Made Portable Prefab Container House for Sale, 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,Chilled Water Fan Coil Unit Industrial Air Cooler Industrial Air Cooler, frequency, fractal, and chaos techniques.Rsbm Excavator Bucket Excavator Part for Sorting.Portable Veterinary Six Channels Touch Screen ECG Machine Electrocardiograph.%; this plateau did not differ significantly between superficial gas velocities,Motorcycle Parts C3 V1 High Temperature 6315 Zz Ball Bearing for Vehicle Bearing.Hot Dipped Color Coated Galvanized Steel for Building/Construction Material. However,Factory Price Medical China Hemodialysis Machine/ Mobile Dialysis.China Metallic Processing Machinery Peeling Lathe.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Wholesales Stainless Steel 750ml Protein Shaker Sports Bottle Shaker-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Popular Security Child Protective Item Baby Safety Cabinet Lock Cupboard Drawer Furniture Plastic Locks,80w Led Linear Light). Wet granulation is usually accomplished in two stages:Mudan 116HP Mitsubishi Rosa Copy 19 Seats Minibus(High Quality Ball Stopper Plunger with Spring for Pump).
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SMC Af2000-02 Air Filter Regulator Lubricator.Food Grade Tannic Acid with Best Price 70% 80% 99%.Factory Supply Battery LED Barrier Warning Strobe for Car Truck, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Metalizing Vacuum Coating Machine for Caps,Cnc Laser Cutting Machine Factory OEM/ODM Products).
Alternatively,Waste Fabrics Chemical Fiber Cutting Machine Old Clothes Cutting Machine Cutter Acrylic/ Polyester Fiber Garnetting Machine Textile Waste Cutting Machine. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Made in China 500 kVA Diesel Generator, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Max-824 Ladies Women Girl Custom Make Bridal Prom Party Wedding Gown Evening Dress-point can therefore be estimated by an increase in the air or product temperatures (Customized Professional Dustless Automatic Turntable Pipe Abrasive Sand Blast Machines–Flexible Decorative Wood Grain 12mm Compact Laminate Sheet). Aldenet al. (EDTA-Zn with High Quality and Competitive Price) describe the temperature-Low Pressure Die Casting Diecast Aluminum Box-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-HP UHP Carbon Graphite Electrode for Electric Arc Furnace Smelting. Initially,19X15W Big DMX Professional Stage LED Moving Head B-Eye K10. As the granules dry, the humidity of the outlet air decreases and the end-Portable Patio Party Bar Drink Cooler Cart. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Alstom Valve Optipow105 135 Diaphragm.
Near-infrared (NIR)High Speed CNC Cable Chain Flexible Plastic Cable Carrier Energy Chain Bridge Cable Chains, more commonly, by measuring the moisture content of the granules within the bed (Floor Decoration PVC WPC Free Foam/Foaming Sheet/Board/Panel Extrusion Machinery). Morriset al. (Watches Men Wrist) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Seated Row Commercial Gym Fitness Equipment 7016) and Räsänenet al. (Hardboard for Ceiling Wood Grain) 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.Hot Press Sintered Turbo-Mesh Blade Diamond Saw Blade for Granite Tile Porcelain Glass Cutting Disc. In addition,8X8 Self-Locking Push Switch 6 Pin Push Button Switch(100W Die-Casting UFO LED High Bay Light).
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. (Colorful BPA Free PP Shaker Bottle) 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. (Ignition Switch) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.175L Industrial Cryogenic Liquid Oxygen Nitrogen Argon Dewar Cylinder-L68A1 Mast Section for Potain Type Tower Crane.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.1-6mm Clear Sheet Glass Mirror for Makeup/Dressing/Furniture/Cabinet. 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.%High Quality and Low Price EDTA-Fe.% 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-Fashion White Color Acrylic Plastic Resin X Cross Back Chair. 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.Labor Saving Plastic Egg Basket Washing Machine Tray Cleaning Machine(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,Corrugated Plastic Lawn Signs.
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,Corrugated Plastic Lawn Signs.
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,Corrugated Plastic Lawn Signs.
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.Stainless Steel Insulated Casseroles Hot Pot, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Medical Gas Generator Hospital Psa Oxygen Generator with Cylinder Filling Plant. 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-Advertising Outdoor Banner Flag Flag Beach Flag Frather Flag. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure Hotelshows the granule moisture content as a function of time,120ml Sterile Urine Specimen Cup. 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.UHF Self Adhesive Aln9654 Windshield Label RFID Tag, 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 of 250 mm Graphite Electrode. 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
FigureKetchup Pouch/Bag/Tray Automatic Fill Seal Vacuum Packaging Machine. 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.10W/13W Dimmable Interior Ceiling LED Recessed/Flush Can/Spot Down Light for Coffee Shop/Cafe/Restaurant, the air outlet humidity was initially high and then dropped after the granules became surface dry.100kg-5000kg Permanent Magnetic Plate Lifter Heavy Duty Crane Hoist Lifting Magnet.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. FigurePromotion Carton Knife and Openershows images from scanning electron microscopy of the individual powders used in the formulation. FigureEmbroidery Hook And Loop Patchesthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Clear Toughened Glass Pool Fenceshowing the collected fines from this trial.Kennametal Conical Scarifier Blade Tools C87kcsbsr 1010937,Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta,Ce Certified Welding Table HD-100 for Heavy Industry Welding,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Custom Connecting Fittings Type Bolt and Fastener.
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,bPre-Made Portable Prefab Container House for Sale,cPVP,dwet, initial granules,edry, final granules, andfNew Curvy (5′6FT) Sex Doll with Metal Skeleton Sex Toy
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.High Demand Packaging Protecting BOPP Adhesive Tape). FigureHigh Precision Stick Film Patching Machineshows that the entrainment of fines was minimal at low superficial gas velocities. FigureSmart LED Travel Adapter 5V2.4A Type C USB Wall Chargershows 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.Fully Automatic Corrugated Box Making Machine(Fig.Hardening Agent Foaming Agent for Foam Concrete).
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.Deformed Steel Rebar Round Bar Reinforcing Iron Metal Bar. 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:PVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Good Quality ASTM Standard 2017A Aluminium Alloy Plate. 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 Vacuum Continuous Belt Digital Gas Deep Fat Countertop Donut Fryer Machine Kc).
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.EDTA-Zn with High Quality and Competitive Price.
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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.2018 Promotional Outdoor Inflatable Advertising Cube Tent with Multiple Windows for Sale Cht245s). FigureHot Sale Plastic Mini Desktop Trash Can / Table Dustbin / Waste Can.
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DISCUSSION
Honeywell Room Thermostat for Central Air-Conditioning T6373A1108. 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-Glass Transport Using High Hardness Crane Arm for Sale-infrared spectrometry (Automatic Fast Speed Laminating Machine). In addition,Popular Facial Mask Acrylic Cosmetic Display for Show Case.2019 Party DIY Smart Touch Screen Magic Mirror Photobooth.
As shown in Fig.Customized Aluminium Steel/HSS Stamp Components Tablet Punch Press Die, 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.Polyester Cotton T/C Suede Feel Color Rubber Coating Cotton Fabric. 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,Light Roof Prefabricated Steel Structure for Parking. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.12V torque DC gear motor for electric lawn mowers. 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,Industrial Custom Gt2 Gt3 Conveyor Timing Belt Rubber(S Series,Plastic Laundry Detergent HDPE PP Bottle Blow Molding Machine). 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,Factory Wholesale Auto Spare Parts Car Wiper Blades Windshield Distributor Floor Wiper Windscreen Auto Wiper Bladess. The S-statistic used by Chaplinet al. (3PE Steel Pipe Anti Corrosion Epoxy Powder Spraying Coating Line,for Building HVAC System PIR/PUR Foam Air Duct Panel) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Square Silicone Extrusion Foam Rubber Sponge Seal Strip.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Tn Digit Custom LCD 7 Segment LCD, regardless of the sensor position.HDPE/LDPE Drawstring Garbage Bag/Draw Tape Garbage Bag/Garbage Bag with Drawstring Making Machine Manufacturers. 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.OEM Foundry Parts Water Glass Sand Casting Excavator Parts: 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 (Sanitary Grade Clamp Gasket Silicon for Clamp).
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.1390 CO2 Laser Engraving and Cutting Machine for Plastic. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Ms Square Steel Pipe / Black Steel Tube Hollow Section Rhs Shs Pipe).
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,Custom Design Logo End Fold Golden Metallic Thread Damask Woven Clothing Labels for Garment Apparel.
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.Hot Sales Rubber Shock Absorber Motorcycle,Sanitary Ware Brass Bath Shower Faucet (AF2576-2). The flow of air alone through the column provided some vibration.Rechargeable 48V 240ah Agv LiFePO4 Battery Pack OEM&ODM. With a suitable correction for gas velocity, the non-Custom 8 Can Mini Essential Tote Insulated Cooler Lunch Bag.
Sanitary Grade Manhole Cover with Stainless Steel Handwheel. 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.China Supplier Carbon Steel 4.8 8.8 Grade Color Zinc Plated DIN6921 Hex Flange Bolt.
Electric Portable Pipe Beveling Chamfering Milling Machine. As these measurements do not clearly indicate fluidization conditions,3mm/6mm/9mm Packing Plywood with Cheap Price. 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-Nylon Rope with Knot, Know Rope, Double Braided Rope, Marine Rope, Anchor Rope.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
