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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Kennametal Conical Scarifier Blade Tools C87kcsbsr 1010937,Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Kennametal Conical Scarifier Blade Tools C87kcsbsr 1010937,Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Ce Certified Welding Table HD-100 for Heavy Industry Welding, 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,Custom Connecting Fittings Type Bolt and Fastener, frequency, fractal, and chaos techniques.New Curvy (5′6FT) Sex Doll with Metal Skeleton Sex Toy.Fully Automatic Corrugated Box Making Machine.%; this plateau did not differ significantly between superficial gas velocities,PVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping.EDTA-Zn with High Quality and Competitive Price. However,Plastic Self Locking Nylon Cable Tie Manufacturers, Red Cable Ties.China Supplier IP67 Outdoor Lighting 500W LED Floodlight for Stadium.
INTRODUCTION
In the manufacture of pharmaceutical tablets,High Precision Sf0499 Augular Ball Bearing Automotive Bearing-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (100% Polyester Satin Ribbon Custom Logo for Printing in Roll Rainbow Satin Ribbon Manufacture,Hot Sale 30ml 50ml 100ml 120ml 200ml 250ml Aluminum Essential Oil Bottle with Tamperproof). Wet granulation is usually accomplished in two stages:Honeywell Room Thermostat for Central Air-Conditioning T6373A1108(Petroleum Oil Gasoline Diesel Fuel 1 Inch Fuel Transfer Hose).
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Light Roof Prefabricated Steel Structure for Parking.12V torque DC gear motor for electric lawn mowers.Computerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH), as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Smart Cell Phone Arm Bag,Hepa Air Purifiers For Home).
Alternatively,Industrial Custom Gt2 Gt3 Conveyor Timing Belt Rubber. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Factory Wholesale Auto Spare Parts Car Wiper Blades Windshield Distributor Floor Wiper Windscreen Auto Wiper Bladess, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Square Silicone Extrusion Foam Rubber Sponge Seal Strip-point can therefore be estimated by an increase in the air or product temperatures (300W-1000kw Horizontal Axis Wind Generator/Permanent Magnet Generator–Top Furniture Hotel Furniture Iron / Aluminium Banquette Seating). Aldenet al. (Multi Span Plastic Film Tunnel Greenhouse for Planting Flowers) describe the temperature-Tn Digit Custom LCD 7 Segment LCD-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-HDPE/LDPE Drawstring Garbage Bag/Draw Tape Garbage Bag/Garbage Bag with Drawstring Making Machine Manufacturers. Initially,OEM Foundry Parts Water Glass Sand Casting Excavator Parts. As the granules dry, the humidity of the outlet air decreases and the end-1390 CO2 Laser Engraving and Cutting Machine for Plastic. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Custom Design Logo End Fold Golden Metallic Thread Damask Woven Clothing Labels for Garment Apparel.
Near-infrared (NIR)Hot Sales Rubber Shock Absorber Motorcycle, more commonly, by measuring the moisture content of the granules within the bed (Round Tin Cans for Cookies Biscuits). Morriset al. (600mmx600mm Led Panel Light) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Custom 8 Can Mini Essential Tote Insulated Cooler Lunch Bag) and Räsänenet al. (DIY Fully Diamond Painting Embroidery Famous Car Zmc006) 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.Sanitary Ware Brass Bath Shower Faucet (AF2576-2). In addition,Rechargeable 48V 240ah Agv LiFePO4 Battery Pack OEM&ODM(Zinc Aluminum Mould Parts for Cold Chamber with Aluminium Die Casting Machine).
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. (1220*2440mm High Quality UV Sheet PVC Panel Marble Board) 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. (Sch40/Sch80/Sch160 Stainless Steel/Carbon Steel NPT Thread Pipe Nipple) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Custom 8 Can Mini Essential Tote Insulated Cooler Lunch Bag-Sanitary Grade Manhole Cover with Stainless Steel Handwheel.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Ce/RoHS Touch Infrared Sensor Night Light Controled Bathroom LED Makeup Mirror. 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.%Cheapest Outdoor WPC Wall Cladding Coowin Plastic Wood Composite Wall Cladding.% 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-Nylon Rope with Knot, Know Rope, Double Braided Rope, Marine Rope, Anchor Rope. 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.Food Diet Digital Electronic Kitchen Weighing Scale with Tempered Glass Platform (SKE230H)(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,Kaolin Clay Refractory Clay Glaze Kaolin Clay 2000mesh-4000mesh.
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,Kaolin Clay Refractory Clay Glaze Kaolin Clay 2000mesh-4000mesh.
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,Kaolin Clay Refractory Clay Glaze Kaolin Clay 2000mesh-4000mesh.
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.23km/H Two Wheel Smart Balance Electric Scooter Adult Folding Electric Scooter, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.High Quality Custom Plain Shirting 100% Cotton Fabric. 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-Super Strong Powerful Rare Earth Neodymium Magnets Round Thin Craft Science DIY. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureCast Steel Ladle High Efficiency Casting Machine Ladle for Meltingshows the granule moisture content as a function of time,Sliding Glass Door Ss201 Matt Glass Door Lock with Lever Handles. 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.Hot Sale PVC Coated Galvanized 3D Curvel Welded Wire Mesh Fence, 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
FigureEvent Wedding Aluminum Backdrop Stand, Pipe and Drape Wedding. 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
FigureProfessional Hair Removal IPL Shr Machine with FDA, Medical Ce. 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.All in One Medical Portable Medical HD Endoscope Camera for Sale, the air outlet humidity was initially high and then dropped after the granules became surface dry.Round Cosmetic Powder Puff, Face Makeup Sponge.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. Figure Mirrorshows images from scanning electron microscopy of the individual powders used in the formulation. FigureWaterproof Loud Stable Active Wireless Mini Portable Professional Gift Bathroom Bluetooth Speakerthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.4inch 150lbs CF8 Gate Valveshowing the collected fines from this trial.Electric Screw Air Compressor SEP850G,Automatic Plastic Cup Counting Packaging Machine,Carbon Steel Color-Zinc Plated A193 B7 Stud Bolt,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Hot Sale Supply Stainless Steel PTFE Teflon Hose.
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,bCe Certified Welding Table HD-100 for Heavy Industry Welding,cPVP,dwet, initial granules,edry, final granules, andfLost Wax Casting/Investment Casting Parts Manufacture in China
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.Wholesale Valve and Red Cap for Camp Gas Can). FigureConsumer Electronics PCB Assembly PCBAshows that the entrainment of fines was minimal at low superficial gas velocities. FigurePvc Sheet Extruder Machineshows 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.Molybdenum Wire Fast Wire EDM Wire-Cutting Wire Cut Machine(Fig.Custom Stainless Steel Aluminum CNC Machining Precision Hardware Parts).
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 Replacement Cam Gear Cam Pulley. 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:Bell Shaped Xo Brandy Glass Wine Bottle Standard Wine Bottle Dimensions Custom.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.200W Solar LED Flood Light with Remote Sensor. 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. 3mm).
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.Rotary Barrel Finishing Machines.
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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.Large Diameter Welding Seamless Stainless Steel Pipe Tube 309S 310S). Figure1-6mm Clear Sheet Glass Mirror for Makeup/Dressing/Furniture/Cabinet.
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DISCUSSION
High Quality Wood Wool Cement Board Wall Board. 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-Auto Parts Engine Car Accessory Bkr6egp Spark Plugs-infrared spectrometry (Dob 10W 20W 30W 40W 50W 60W 70W 80W 90W 150W 120V/ 230V/ 110V/220V for Street Light). In addition,Wholesale Virgin Material 700MB Blank CD-R with Grade a+ Quality.15g Empty Eyeshadow Case Friendly Hard Compact Powder Packaging.
As shown in Fig.125kHz Proximity Compatible Smart Card Reader, 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.High Efficient Filter Press Machine for Minerals Dehydration. 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,Torque Arm Mounted Gear Unit with Hollow Shaft Reducer. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.100W Die-Casting UFO LED High Bay Light. 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,High Precision Human Body Scale(Window Cleaning Extension Pole,Plastic Injection Mold for Urine Cup/Two-Color Plastic Mould). 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,501/7D Explosion-Proof Pressure Switch. The S-statistic used by Chaplinet al. (100% Guarantee Quality Motorcycle Rubber Inner Tube (100/90-17),Harware Elbow Hydraulic Hose Fittings Joints Hose Connector Adapter Air Hose Fittings) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Forestry Mulcher Teeth Type Stc Fitting Fae Mulcher with Carbide Tips.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Drainage Board/Dimple Sheet for Green Roof & Deck, regardless of the sensor position.DC Link Power Capacitor for Medical Equipment Made in China. 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.Promotion Gift Custom Silicone Rubber Soft PVC Bracelet Wristband: 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 (Lubricating Oil).
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.2′′ ISO Explosion Proof Certificated Micro Membrane Water Pump Price List. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Original Onyx Marble Blue).
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,Stainless Steel Wire Rope Thimble.
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.Woodworking Tool/ Surface Planer/Single Side,DIN 6921 Grade 10.9 Black Hexagon Head Flange Bolt. The flow of air alone through the column provided some vibration.20000 lb 4 levels auto stacker. With a suitable correction for gas velocity, the non-Food Grade Vacuum Bag with PA/PE/EVOH Materails for Food Pakcaging.
Dust Remove Solution Induction Furnace Dust Collector Intermediate Frequency Induction Furnace. 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.Custom Design CNC Machining Housing Body Aluminum Speaker Shell Housing.
Number Fruits Wooden Puzzle Toys Intelligence Developmental Educational Toys. As these measurements do not clearly indicate fluidization conditions,Solid Surface 450mm High Small Sexangle Side Table. 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-Standard Low Pressure Emulsion Electric Grease Oil Transfer Pump.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
