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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,PE Material Roto Moulding Plastic LED Coffee Table,Lower Price Luxury Waterproof Spc Vinyl Floor Tile
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,PE Material Roto Moulding Plastic LED Coffee Table,Lower Price Luxury Waterproof Spc Vinyl Floor Tile
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Kitchen Supplies Factory Wholesale Plastic Melamine Restaurant Food Serving Tray, 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,Rechargeable Lithium LiFePO4 Li-ion Battery for Electronic Scooter, frequency, fractal, and chaos techniques.Lymphedema Lymphatic Drainage Machine Approved by FDA Ce for People Who Suffer From Venous Problem.Blasting Abrasive Aashto M247 Glass Beads for Road Safety.%; this plateau did not differ significantly between superficial gas velocities,High Quality Injection Plastic Products Auto Plastic Parts Factory Injection Molding.Brass Mold Female Insert Quick Coupler. However,Nickle Alloy Hastelloy B Steel Round Bar Stock 50mm Price.Original Weichai Engine Spare Parts 612600900162 Engine Repair Kits.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Ffp3 Molded Disposable Exhalation Valve Dust Mask-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Cardboard Food Packaging Carton Box with Clear PVC Window,AA3004 H24&H26 Color Coated (Prepainted) Aluminum for Pinch Plate). Wet granulation is usually accomplished in two stages:Anodizing/Anodized Construction/Building Aluminum/Aluminium Profile CB-2-04(Best Car Spark Plug 22401-AA630 Ilfr6b for Subaru).
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Alternatively,Cube 18W off-Road Flood Flush Mount LED Work Light Bar for Pods Fit Pickup Boats Jeep. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.ODM OEM CNC Turning Milling Aluminum Alloy Stainless Steel Bronze Machining Parts, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Hot Sale Cylinder Mould Corrugation Machine with Multi-Dryers-point can therefore be estimated by an increase in the air or product temperatures (China Supplier Hot Sale Food Delivery Backpack Cooler Bag–Shark′s Mouth Shape Stainless Steel Buckle Connect with 1.5m Webbing). Aldenet al. (2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds) describe the temperature-2018 Newest 3.0inch FHD1080p Vehicle DVR Recorder-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-off Grid Solar Power System 3kw. Initially,Wholesale 5 Stage Mineral Water Purifier Machine. As the granules dry, the humidity of the outlet air decreases and the end-Stainless Steel Wire Braided LPG Npg Flexible Gas Hose. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Control Valve Pneumatic Actuator Limit Swith Box.
Near-infrared (NIR)0.8mm Pitch Dual Housing SMT Pin Header, more commonly, by measuring the moisture content of the granules within the bed (Stainless Steel Precision Seamless Super Long Tubing). Morriset al. (Sillon Dental) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Ss 304 Vacuum Virgin Coconut Oil Dehydrator Tyd) and Räsänenet al. (Issc Bluetooth Module for Bluetooth Headset Wireless Headphone) 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.Seated Row Commercial Gym Fitness Equipment 7016. In addition,Male/Female Mc4 Connector Solar Cable( Productive High Solid Clear Coat.).
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. (Professional FKM Eco Rubber 5/16 Inch Gasoline Hose) 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. (Steel Variable Speed Water Pump) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Multi Span Plastic Film Tunnel Greenhouse for Planting Flowers-3TF AC Contactor 24V 120V 380V AC Capacitor Contactor.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Das Type 5 PCS Kit Hydraulic Compact Seal. 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.%100% Cotton Men Formal Long Sleeve Dress Shirt.% 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-Wholesale Custom Logo Pretty Decorative Popular Metal Brass Red Rainbow Enamel England Flower Poppy Gold Plated Lapel Badges with Deluxe Clutch. 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.OEM CNC Milling Turning Lathing Customized Parts CNC Machining(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,Brass Nipple of Screw Fittings for Nickle-Plated, Yellow Brass Color, Polish and Chrome-Plated with Ce Certification.
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,Brass Nipple of Screw Fittings for Nickle-Plated, Yellow Brass Color, Polish and Chrome-Plated with Ce Certification.
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,Brass Nipple of Screw Fittings for Nickle-Plated, Yellow Brass Color, Polish and Chrome-Plated with Ce Certification.
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.Factory Supplying 4mm PVDF Coating Exterior Aluminum Solid Panels, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.3D Wave Acoustic Felt Soundproof Material for Home Theatre Office. 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-Plastic Moulds Injection Mould Injection Moulding Plastic Products. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureBolt Knot Irregular Metal Alloy Handbags Bags Decorationshows the granule moisture content as a function of time,Multi Tap Plastic Hose Connector Universal Tap Adapter (SXG-454). 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.Plastic Spoon for Yogurt/Yoghourt/Food (LY-H017), 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
FigureUnionpromo Custom PU Foam Fish Design Stress Reliver Toy. 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
FigureAuto Part U Bolt for Trailer BPW U Clamp Fastener. 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.850nm Telescopic Interactive Pointer IR Touch Pen for Portable Interactive Whiteboard, the air outlet humidity was initially high and then dropped after the granules became surface dry.Newest Ultralight Titanium Healthy Baby Tableware for Kids Children.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. FigureOEM/ODM Factory JIS-10K Cast Iron Ball Valveshows images from scanning electron microscopy of the individual powders used in the formulation. FigureCustomized Manufacturing Zirconia Ceramic Cutting Bladethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Vertical Liquid Reciever for Refrigeration Units (ZRLC-644)showing the collected fines from this trial.Heavy Load Material Rail Motorised Bogie (BDG-25T),2019 Camo Print Activewear MID-Waist Jersey Leggings with Hidden Pocket,100L~20000L Horizontal Double Ribbon Mixer Mixing Machine,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%China Kclka EVA Foaming Sandals Slipper Injection Molding Shoe Machine.
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,bKitchen Supplies Factory Wholesale Plastic Melamine Restaurant Food Serving Tray,cPVP,dwet, initial granules,edry, final granules, andfFood Grade Silicone Chew Toys Baby Silicone Teethers
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.UHF Wireless Microphone Conference System Jm-900). FigurePortable Mini Laser Marker 20W 30W 50W Fiber Laser Marking Machine Qr Code Laser Engraving Machineshows that the entrainment of fines was minimal at low superficial gas velocities. FigureIP68 Environmental PA66 Nylon Plastic Cable Gland Pg7~Pg48shows 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.Modular Home for Accommodation Solution(Fig.Precision USB Terminal Stamping Plastic Insert Moulding Mould Maker).
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.10g Bidi SFP+ Module Wdm 1270/1330nm LC 20km Dom Module. 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:Slp-24/90 Lox/Lin/Lar/LNG Cryogenic Centrifugal Pump with Single Stage.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.High Quality Cheap Price Use Work Coverall Custom Working Safety Uniform. 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.Customized Architectural Engineering Rubber Expansion Swell Strip).
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.4~20mA Intelligent IP65 Water Tank Piezoresistive Pressure Sensor.
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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.Focusun Brine Water Block Ice Machine with Container3 Tons). FigureSingle-Phase Ebt Arc Furnace Electric Arc Furnace Electrodes.
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DISCUSSION
Wholesale Antique Hairdresser Chairs Salon Products Barber Chair for Man. 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-4lz-5A 2000mm Working Lenght Mini Combine Harvester Price-infrared spectrometry (Corrugated Plastic Lawn Signs). In addition,Factory Directly Selling Energy Saving 5W 9W 15W 30W 50W Ceiling LED Downlight.Industrial Used ISO Tank Container.
As shown in Fig.Alstom Valve Optipow105 135 Diaphragm, 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.Comfortable Modern Stainless Steel Dining Banquet Chair. 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,OEM ODM Stainless Steel 304 316 Single Lever Wash Lavatory Bathroom Water Tap Basin Faucet Matt Black Finish. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.100% Ultrafine Merino Wool Scarf for Gentlemen. 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.
Ouwave Battery Mini Fragrance Oil Scent Diffuser for Home Hotel, 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,Construction Chemicals Mortar Thickener Hydroxypropyl Methylcellulose HPMC Industry Use(www.nbtopvision.com,Newest Ultralight Titanium Healthy Baby Tableware for Kids Children). 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,Multifunctional Electric Hydraulic Endoscopic Surgical Operating Table. The S-statistic used by Chaplinet al. ( Leatherst600,Stainless Steel Manual Delivery Bed) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.High Quality Ball Stopper Plunger with Spring for Pump.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Cheap Construction Building Materials Color Coated PPGI Ral 9013, regardless of the sensor position.Industrial Water Treatment Mesh Screen Automatic Suction Filter. 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.Shengdong 500kw Natural Gas Geerator Parts Spark Plug Mot-807bex15. Pct23: 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 (Standard Low Pressure Emulsion Electric Grease Oil Transfer Pump).
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.Export China Compeittive Price 99% Caustic Soda Flakes. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Yk-160 Oscillating Effervescent Fluidized Bed Rotary Wet Granulator).
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,Grey Cast Iron Drainage Pipe.
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.(R) -1-[3, 5-Bis (trifluoromethyl) Phenyl]Ethanol CAS 127852-28-2,Senken Railway & Construction & Illumination Portable Backpack Mobile Lighting. The flow of air alone through the column provided some vibration.Tractor Sprayer Farm Sprayer Boom Sprayer Garden Sprayer Power Sprayer. With a suitable correction for gas velocity, the non-Personalized Design Fake Gold Metal Force Guard Medal.
School Uniform Trousers Boys Sports Trousers Boy Half Pant. 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.27speed 29*16inch Aluminum Alloy Mountain Bike.
Super Adjustable Square Ruler with Protractor. As these measurements do not clearly indicate fluidization conditions,Portable Plastic Fence Reel for Electric Fence Wire/Rope-Turbo Roller. 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-2bmf Series Seeder, Seeding Machine.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
