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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,2018 Promotional Outdoor Inflatable Advertising Cube Tent with Multiple Windows for Sale Cht245s,210ml Glass Amber Beer Bottle Manufacturer Factory Price Wholesale Supplier in China1203
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,2018 Promotional Outdoor Inflatable Advertising Cube Tent with Multiple Windows for Sale Cht245s,210ml Glass Amber Beer Bottle Manufacturer Factory Price Wholesale Supplier in China1203
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Graphite Mould for Diamond Wire Saw Segment Sintering, 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,Automotive Masking Tape Jumbo Roll High Temperature Resistant, frequency, fractal, and chaos techniques.Supply Terbinafine HCl CAS. 78628-80-5 Terbinafine Hydrochloride Powder High Quality.Pg56zy58 24V DC Gear Motor with Brake and Encoder.%; this plateau did not differ significantly between superficial gas velocities,2019 Curved Round Office Sofa School Sofa Seating.Pharmaceutical 0.22um 2.5 PTFE Capsule Filter Alternative. However,Hot Sale Sequin Notebook with Lock.Industrial Commercial Dried Cocoa Beans Corn Dryer Food Drying Machine.
INTRODUCTION
In the manufacture of pharmaceutical tablets,HOWO Truck Parts Az9731520021 Front Spring Front Bracket-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Portable Plastic Fence Reel for Electric Fence Wire/Rope-Turbo Roller,Measure Cup/Jug). Wet granulation is usually accomplished in two stages:Manufacture Direct Carbonless NCR Cash Register Paper Rolls(High Quality Injection Plastic Products Auto Plastic Parts Factory Injection Molding).
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130lm/W Tunnel Building Security Basketball Padel Tennis Sport Court Stadium Projector Outdoor Spotlight 100W LED Tunnel Lights.Rotary Screener for Wood Shavings.SDIC Effervescent Chlorine 2.7g Tablets 1kg/Jar, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Factory Price Pre Galvanized Steel Pipe Electrical Cable Conduit,Optical Aspheric Lens for Optical Instrument).
Alternatively,Saw Blade for Harvester Machine. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.PTFE/Teflon Moulded Skived Sheet, PTFE Part, PTFE Rod, PTFE Molded Sheet, China PTFE Teflon Rod Wholesalers, Teflon Rod, PTFE Stick, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Veterinary Esu Unit/Diathermy Machine Veterinary Electrosurgical Unit-point can therefore be estimated by an increase in the air or product temperatures (Carbide Wire Drawing Dies/Tungsten Carbide Cold Heading Dies–Factory Wholesale High Quality Color 350 Ml Auto Self Stirring Mug Electric Mixing Coffee Cup). Aldenet al. (Heat Insulation IXPE Foam XPE Foam Material) describe the temperature-6 Rails Galvanized Portable Metal Frame Material Cattle Yard Panels-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-Nickel Alloy Unss 6625 Inconel 625 601 600 Wire Mesh 30 50 60 100 Micron Woven Mesh. Initially,Cabbage Pomelo Pink Florist Cold Room Cold Rooms for Seafood Cold Storage for Flowers. As the granules dry, the humidity of the outlet air decreases and the end-Professional Spigot Box Truss Facility for Outdoors Performance. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-6-200mm Thick Metal Sheet CNC Flame Cutting Machine.
Near-infrared (NIR)Water Treatment Water Treatment Plant Water Treatment Chemical, more commonly, by measuring the moisture content of the granules within the bed (13MPa Fine Stone Electric Concrete Pump for Sale). Morriset al. (Backhoe Loader Caterpillar 430 Used Excellent Braking Power) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Vacuum High Viscosity Paste Mixer Machines High Viscosity Mixer) and Räsänenet al. (Exhaust Flexible Pipe with Inner Braid 1.3/4X 4) 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.Ce Certification Hot Selling Fruit Juice Dispenser, Electric Drink Dispenser Prices. In addition,Waste Used Vacuum Pyrolysis Tyre Hydraulic Oil Filtration Gear Oil Purification Regeneration Machine(Fashion Casual Wear Girl′s Round Neck Loose Summer Women′s T-Shirt Blouse Clothes).
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. (Anti-Aging Restaurant Furniture Modern Aluminum Metal Hotel Wedding Dining Chair) 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. (Jinan High Speed 3D Atc Woodworking CNC Router Price) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Fiberglass Fabric High Temperature Cloth for Sale-Cordless Vacuum Cleaner Lithium Battery Powered Wireless Vacuum Cleaner.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Tray Type Activated Carbon Air Filter. 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.%Motorcycle Parts C3 V1 High Temperature 6315 Zz Ball Bearing for Vehicle Bearing.% 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-Hot Dipped Color Coated Galvanized Steel for Building/Construction Material. 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.Factory Price Medical China Hemodialysis Machine/ Mobile Dialysis(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,China Metallic Processing Machinery Peeling Lathe.
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,China Metallic Processing Machinery Peeling Lathe.
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,China Metallic Processing Machinery Peeling Lathe.
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.Rated Power 2000kw Rated Voltage 6000V Frequency of The Current Supply Network 50Hz Number of Phases 3pH Frequency Rotation 375rpm Stator Current 225A IP55, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Wholesales Stainless Steel 750ml Protein Shaker Sports Bottle Shaker. 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-Mudan 116HP Mitsubishi Rosa Copy 19 Seats Minibus. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigurePlastic Touch Screen Door Exit Push Release Button Switchshows the granule moisture content as a function of time,70GSM 80GSM Customize A4 Copy Huijun Paper for Office Supply. 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.Welded Gabion Hot-Dipped Galvanized with Hihg Quality, 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
FigureFashion Designer PU Shoulder School Backpack Bag Women. 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
FigureFactory Direct Sale Vinyl Covering PVC Wallpaper Wall Decoration Waterproof. 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.Fabrics Aluminum Al Plating Thermal Materials Vacuum Coating Machine, the air outlet humidity was initially high and then dropped after the granules became surface dry.SMC Af2000-02 Air Filter Regulator Lubricator.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. FigureCheap Construction Building Materials Color Coated PPGI Ral 9013shows images from scanning electron microscopy of the individual powders used in the formulation. Figure40W LED Recessed Panel Light LED Lights for Homethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Logistics Agent Shipping Rate From Guangzhou to Singapore Portshowing the collected fines from this trial.Food Grade Tannic Acid with Best Price 70% 80% 99%,Factory Supply Battery LED Barrier Warning Strobe for Car Truck,Waste Fabrics Chemical Fiber Cutting Machine Old Clothes Cutting Machine Cutter Acrylic/ Polyester Fiber Garnetting Machine Textile Waste Cutting Machine,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Made in China 500 kVA Diesel Generator.
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,bGraphite Mould for Diamond Wire Saw Segment Sintering,cPVP,dwet, initial granules,edry, final granules, andfMax-824 Ladies Women Girl Custom Make Bridal Prom Party Wedding Gown Evening Dress
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.Gold Color Stainless Steel Mirror Sheet Made in China with Low Price). FigureNew 4mm/5mm/6mm/8mm/10mm/12mm/15mm/19mm Safety/Toughened Curved Glassshows that the entrainment of fines was minimal at low superficial gas velocities. FigureChome Double Prong Slatwall Display Hookshows 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.Low Pressure Die Casting Diecast Aluminum Box(Fig.Best Selling AV Wall Plate Female to Female Faceplate for Smart Home).
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.Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063. 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:HP UHP Carbon Graphite Electrode for Electric Arc Furnace Smelting.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Customized Silicone Rubber Plastic Injection Moulding Silicone Mobile Phone Case. 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.Diamond Stone Cutting Blade Circular Saw Blades for Concrete).
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.19X15W Big DMX Professional Stage LED Moving Head B-Eye K10.
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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.Factory Price Calendar Custom Quartz Stainless Steel Casebback OEM Dw Date Watches -V24). FigureHigh Speed CNC Cable Chain Flexible Plastic Cable Carrier Energy Chain Bridge Cable Chains.
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DISCUSSION
8X8 Self-Locking Push Switch 6 Pin Push Button Switch. 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-175L Industrial Cryogenic Liquid Oxygen Nitrogen Argon Dewar Cylinder-infrared spectrometry (Elegant Office Furniture Aluminium Arm Director Leather Office Chair). In addition,L68A1 Mast Section for Potain Type Tower Crane.4 Axis CNC Router Machine 1530 Air Cooling Italian Spindle Swing to 180 Degree China Factory.
As shown in Fig.Kl Feed Pellet Mill, 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.2.1A Hot Sale Universal Wall Charger Newest Dual USB Charger. 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,P2.571 Indoor Digital Advertising Floor Standing LED Poster Display. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Nylon/ABS/POM Mechanical Precision Push Button CNC Machining Parts. 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,Fashion White Color Acrylic Plastic Resin X Cross Back Chair(CNC/Fabrication/Precision Machining/Machine/Machined/Mechanical/Equipment/Spare Parts/Service/Products/Component,Control Valve Pneumatic Actuator Limit Swith Box). 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,Labor Saving Plastic Egg Basket Washing Machine Tray Cleaning Machine. The S-statistic used by Chaplinet al. (Indoor Use PIR Motion Sensor LED Wall Night Light with Ce RoHS FCC,Hot Sale Desenk Passenger Elevator with Cheap Price) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Corrugated Plastic Lawn Signs.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Stainless Steel Insulated Casseroles Hot Pot, regardless of the sensor position.Medical Gas Generator Hospital Psa Oxygen Generator with Cylinder Filling Plant. 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.Advertising Outdoor Banner Flag Flag Beach Flag Frather Flag: 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 (Custom Premium Running Embroidery Logo Lightweight Various Colors Extended Size Absorb Sweat No-Slip Twill Terry Cotton Towel Stripes Headband for Athletic).
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.120ml Sterile Urine Specimen Cup. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (m.worldlinkhat.com).
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,UHF Self Adhesive Aln9654 Windshield Label RFID Tag.
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.Factory Price of 250 mm Graphite Electrode,Ketchup Pouch/Bag/Tray Automatic Fill Seal Vacuum Packaging Machine. The flow of air alone through the column provided some vibration.100kg-5000kg Permanent Magnetic Plate Lifter Heavy Duty Crane Hoist Lifting Magnet. With a suitable correction for gas velocity, the non-Kennametal Conical Scarifier Blade Tools C87kcsbsr 1010937.
Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta. 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.Ce Certified Welding Table HD-100 for Heavy Industry Welding.
Custom Connecting Fittings Type Bolt and Fastener. As these measurements do not clearly indicate fluidization conditions,New Curvy (5′6FT) Sex Doll with Metal Skeleton Sex Toy. 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-EDTA-Zn with High Quality and Competitive Price.
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Acknowledgments
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References
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