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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Factory Price Pre Galvanized Steel Pipe Electrical Cable Conduit,TBB Model Electric Counterbalance Stacker
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Factory Price Pre Galvanized Steel Pipe Electrical Cable Conduit,TBB Model Electric Counterbalance Stacker
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Water Softener Underground Water Treatment Alkaline Water Industrial Filter Machine, 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,99% Sodium Gluconate Used in Concrete as Retarder Agent Water Reducing Admixture Steel Surface Cleaning Additives, frequency, fractal, and chaos techniques.Dust Tester-Dust Concentration Detector-Portable Pm2.5 Detector-Smoke Detector, R & D Sales[Onetest].Diamond Stone Cutting Blade Circular Saw Blades for Concrete.%; this plateau did not differ significantly between superficial gas velocities,Yellow Color Pipe Heat Insulation Roll Aluminum Foil Glass Wool.High Quality Restaurant Wooden Dining Room Chair with Leather Seat. However,Drop Forged One Way Load Buckle.Good Quality Polycarbonate (PC) Plastic Board.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Tungsten Carbide Corner Radius 55HRC End Mill-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Most Popular 200watt Modified Sine Wave Power Car Inverter,Compost Making Machine). Wet granulation is usually accomplished in two stages:Best Price of Welded Stainless Steel Pipe (202)(Export China Compeittive Price 99% Caustic Soda Flakes).
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Alternatively,2018 Hot Sale Good Quality Sponge Iron Supplier Best. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Rectangular Air Pipe Sheet Pneumatic Duct Bending Machine for Sale, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Professional Plastic Injection Molding/Mold Plastic Part Manufacturer in China-point can therefore be estimated by an increase in the air or product temperatures (Peel and Stick Self Adhesive PVC Vinyl Flooring Tile for Building Material– Manual). Aldenet al. (CNC Plasma 1530 1325 Machine Stainless Steel Router) describe the temperature-Fiberglass Fishing Cabin Boats for Sale-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-Cold Rolled Stainless Steel 304 Tubes Hollow Pipe. Initially,Factory Wholesale High Quality Color 350 Ml Auto Self Stirring Mug Electric Mixing Coffee Cup. As the granules dry, the humidity of the outlet air decreases and the end-059 Factory Bimetal Thermometer. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Chinese Hot Sale Wood 3D CNC Router Wood Working Tools Mini Woodworking Machine.
Near-infrared (NIR)Ce Approved Warehouse Storage Heavy Duty Steel Stacking Pallet Rack, more commonly, by measuring the moisture content of the granules within the bed ( Anchor Clamp). Morriset al. (Hiking Camping Tent Wholesaler Quotes & PriceList) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (High Quality Stainless Steel Glass Door Fittings Mirror Nail) and Räsänenet al. (Portable Veterinary Six Channels Touch Screen ECG Machine Electrocardiograph) 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.Low Noise Panel Fan 280X280X80mm 220-240V AC 105W. In addition,High Tenacity Low Cost Forged Square Buckle for Lashing Belt(12124075 Brass Crimp Termian of Assembly Auto Delphi Wire Harness).
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. (Modern Custom Made Restaurant Furniture Booth Seating (SP-CS146)) 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. (Auto Folder Gluer Machinery) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Square Shelf Floor Lamp End Table with USB Chargers-Manufacturer Yoga Fitness Exercise TPE Foam Balance Pad.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.1.5m UV Printer Large Format Digital UV LED Flatbed Inkjet Printer. 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.%Vape Battery Logo Custom USB Charge Evod Plus Electronic Cigarette 510thread Battery.% 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-Fast Obvious 4 in 1 Cavitation Vacuum Liposuction Machine (VS-101). 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.Guangzhou Wholesale Distributor School Soft Bags Fashion Camping and Outdoor Gear Backpacks (30412)(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,High Quality Customized Alumina Ceramic.
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,High Quality Customized Alumina Ceramic.
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,High Quality Customized Alumina Ceramic.
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.72W Rolling Thin Film Solar Panel Flexible (PVL-72), frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Cheap Felt Disposable Indoor Bathroom Guest Slippers Hotel Use. 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-Chusheng 40FT Container Cargo Wall Side Semi-Trailer Price. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure34mm Precision Tooth Multifunctional Saw Blade Cuttershows the granule moisture content as a function of time,Best Price Hr A131 Grade a/B Marine Ship Building Steel Sheet Plate High Quality. 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.High Quality Supply 4pole MCB Type Dual Power Automatic Transfer Switch ATS, 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
FigureChicken Dung Organic Fertilizer Granulating Machine. 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
FigureStainless Steel Pre Water Filter. 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.Graphite Mould for Diamond Wire Saw Segment Sintering, the air outlet humidity was initially high and then dropped after the granules became surface dry.China Factory Customized Precision Optical Lens.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. FigureOilfield Casing Pipes/Carbon Seamless Steel Pipe/Oil Well Drilling Tubing Pipeshows images from scanning electron microscopy of the individual powders used in the formulation. FigureBelt Conveyor Rubber Impact Barthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.6PCS *15W Mini Bee Beam DJ Fest Home Show Bar Stage Party Light Stage Machineshowing the collected fines from this trial.Super LED with Solar Power Traffic Warning Lamp,Safe and Highly Reliable Machine CNC Cutting Machine Abrasive Waterjet,P4 High Brightness LED Screen, Full Color LED Wall Outdoor Rental LED Display for Stage,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Shark′s Mouth Shape Stainless Steel Buckle Connect with 1.5m Webbing.
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,bWater Softener Underground Water Treatment Alkaline Water Industrial Filter Machine,cPVP,dwet, initial granules,edry, final granules, andfPrivate Label Fitness Wear 2020 New Fashion Women T-Shirt Custom Yoga Wear Women Gym Top Short Sleeve
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.CNC Tool Holder Lathe Ball External Turning Tool). FigureAluminium Sheet/Plate 2024/2A12/2A14//2A50/2219/2017 for Structural Parts of Aircraftshows that the entrainment of fines was minimal at low superficial gas velocities. FigureChina Feed Screw Conveyorshows 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.Flange Seamless Stainless Steel Pipe Fitting(Fig.Modern Style Armless Dining Room Chair for Living Room).
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.20W 30W Fiber Qr Code Laser Marking Engraving Machine for Metal. 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:Fire Emergency Escape Safety Face Mask with Color Box.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Cold Rolling Slitted Edge No. 1 Surface 304 Stainless Steel Coil. 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.D-Shape*16 Wax Discs for Amanngirrbach Ceramill).
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.High Guality Conference Hall High Back Auditorium Chair (FECMP07).
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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.Cwe-65 1500W pH65/0810 Hammer Drill Demolition Hammer). FigureFashion Cotton Canvas Ladies Tote Bag with PU Shoulder Strap.
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DISCUSSION
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As shown in Fig.Advertising Outdoor Banner Flag Flag Beach Flag Frather Flag, 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.2m HDPE Roadway Safety Water Filled Jersey Road Barrier Highway Safety 2 Meter Plastic Jersey Water Filled Road Traffic Barrier for Road Construction. 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,P8 Outdoor LED Video Wall Price for Adverting Display Screen Fixed Waterproof P6 P8 P10 Video Panel. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Wedding Event Antique Quality Wood Chiavari Chairs. 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,Logistics Agent Shipping Rate From Guangzhou to Singapore Port(Led Operation Theater Lamp,Fuyi Single-Cell Protein Product Separation Tubular Bowl Separator). 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,16000 Liters High Pressure Water Washing Street Cleaning Truck. The S-statistic used by Chaplinet al. (Top Fuse Tricot Woven Interfacing Fabric Fusible Warp Knitted Interlining,94V0 PCB for USB Flash Drive with Ce RoHS) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Indurstial Water Treatment Stainless Steel Water Storage Tank.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-300t Full Dull Plain Taffeta PU Coated Nylon Fabric, regardless of the sensor position.Customized Injection Plastic Welding Helmet Mould. 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.Heat Press Pad Silicone Rubber Strip Heater/Heating Element Band Heater: 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 (1t-10t Mineral Water Bottling Treatment Plant with Ce Certificate).
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.Pipe Making Machine/ ERW Tube Mill. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Kayal Best Quality AC 240V Coil LC1-D1810 M7 Motor Control Magnetic Contactor).
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,Hotel Banquet Event Hall Restaurant Party Wooden Dance Floor.
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.Popular Stainless Steel Musical Percussion Instrument for Sale (HJ-17005),White Black Acrylic Pen/Pencile/Scissors/Remote Controller Storage Box. The flow of air alone through the column provided some vibration.color coated aluminum foil for decoration. With a suitable correction for gas velocity, the non-EVA Military Working Safety Boots with Steel Plate (WWB041).
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Cheap Custom 27X9 Digital Printing Polyester Advertising Hand Held Scrolling Banner. As these measurements do not clearly indicate fluidization conditions,Nsulated Fireproof Lightweight Labor-Saving Composite Ceiling. 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-CAS84-66-2 Diethyl Phthalate (DEP) Manufactuerf Solvent Lubricant Deodorant.
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Acknowledgments
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References
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