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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,EVA Military Working Safety Boots with Steel Plate (WWB041),Three Phase Hoist Driving Device Electric Motor
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,EVA Military Working Safety Boots with Steel Plate (WWB041),Three Phase Hoist Driving Device Electric Motor
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,ISO9001 6-12 Guage Plain Steel Wire Ground Cloth Staples, 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,Cheap Custom 27X9 Digital Printing Polyester Advertising Hand Held Scrolling Banner, frequency, fractal, and chaos techniques.Nsulated Fireproof Lightweight Labor-Saving Composite Ceiling.Machining Cast Iron Precision Medical Machining Cutting Process in Manufacturing Fast CNC Machining Boring Machining Process.%; this plateau did not differ significantly between superficial gas velocities,High Effective Oxytetracycline Capsules 250mg GMP Bp.CAS84-66-2 Diethyl Phthalate (DEP) Manufactuerf Solvent Lubricant Deodorant. However,PE/PVC Mixed Plastic Separator Machine Price in China.Aluminum Alloy Frame 26inch 36V Electric Bicycle.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Filter Press for Sandplant Sludge Treatment-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Stainless Steel 304 316 EPDM Bonded Sealing Washer,Grist Hopper Suppliers for Sale). Wet granulation is usually accomplished in two stages:T Type Handle Torque Hex Multi Specification T-Type Wrench(Fiberglass Fabric High Temperature Cloth for Sale).
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Alternatively,Scrap Iron Electric Induction Melting Furnace (GW-1T). The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.34mm Precision Tooth Multifunctional Saw Blade Cutter, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Industrial Double Shaft Paddle Type Dry Powder Mixer Machine-point can therefore be estimated by an increase in the air or product temperatures (Mission 40 High Air Presure DTH Button Bits–Best Price 316 Stainless Steel Sheets and Coils). Aldenet al. (Innovative Design Aluminum Film Metallized Non Woven Fabric) describe the temperature-Ss 304 Vacuum Virgin Coconut Oil Dehydrator Tyd-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-Yaqi Church Auditorium Chair with Plastic Armrest and Tablet (YA-04P). Initially,Oeko-Tex Audit Promotional 100% Organic Cotton Shopping Bag. As the granules dry, the humidity of the outlet air decreases and the end-Air Cooled Industrial Chiller, Water Cooler. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Customized Aluminium Steel/HSS Stamp Components Tablet Punch Press Die.
Near-infrared (NIR)Butt Welded Reliable Quality Pex Al Pex Pipe for Cold Water, more commonly, by measuring the moisture content of the granules within the bed (CNC Machining Precision Customized Mechanical Parts). Morriset al. (100w Led High Bay Lighting Factory OEM/ODM Products) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Hot Sell 4 Zones Walk-Through Metal Detector Gate Door Frame Metal Detector with Remote Control) and Räsänenet al. (Double UPVC WPC PVC Plastic Pipe Making Extrusion Line) 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.Stainless Steel 304 316 EPDM Bonded Sealing Washer. In addition,PVC Plastic 45 Deg Elbow(High Temperature Resist Non-Stick Pizza Mesh Tray).
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. (Customize Ad-152 Clear Advertising Acrylic POS Display) 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. (Thread Rolling Machine Flat Die) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Stainless Steel Manual Stuffing Vacuum Hot Dog Sausage Filler-2017 Wholesale Custom Printed Medal for Festival.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig. High Weather Resistant. 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.%Precision DIN Three Holes Carbide Angular Button Dies and Punch.% 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-Customized High Quality Board Game - Global World Adventure Board Game. 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.Top Furniture Hotel Furniture Iron / Aluminium Banquette Seating(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,Big Office Coworking Desk 4 People Group.
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,Big Office Coworking Desk 4 People Group.
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,Big Office Coworking Desk 4 People Group.
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.Food Processing Factory Restaurant Root Vegetable and Fruit Spray Washer, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.230mm Y Style Paint Roller Handle with Cage. 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-Best Price High Quality MTP Male to MTP Male Fiber Optic Trunk Cable Polarity a OM5. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureSmall Portable Submersible Water Air Cooler Pump for Fountainshows the granule moisture content as a function of time,Handmade Transparent Glass Dome with Wooden Base. 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.OEM Steel Stamping Fabrication Custom Metal Stamped Metal Parts, 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
FigureDn800mm Sn4 HDPE Winding Structure Wall Plastic Pipe Carat Tube. 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
FigureHome Elevator for 2-4 Person. 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.Big Office Coworking Desk 4 People Group, the air outlet humidity was initially high and then dropped after the granules became surface dry.Agriculture PP Split-Film Baler Twine Baling Twine.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. Figure2018 Spectator Telescopic Bleacher Seating Professional Grandstand Bleachersshows images from scanning electron microscopy of the individual powders used in the formulation. FigureSuede Leather Safety Shoes Construction Boots Work Shoes with Steel Toe Capthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Super Strong Powerful Rare Earth Neodymium Magnets Round Thin Craft Science DIYshowing the collected fines from this trial.Zinc Aluminum Mould Parts for Cold Chamber with Aluminium Die Casting Machine,High Temperature Electric Heater Custom Hot Runner Nozzle Heater,Katrina 1000L Medical 4 Celsius Blood Bank Refrigerator,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%2kw 3kw 3015 1530 Fiber CNC Laser Cutter/Fiber Laser Cutting 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,bISO9001 6-12 Guage Plain Steel Wire Ground Cloth Staples,cPVP,dwet, initial granules,edry, final granules, andf2017-2020 China PU Shoe Cover Machine for Italy Shoe
To measure entrainment, a fines collector was installed on one of the air outlets. The filter bag attached to the collector was removed and weighed at 5-min intervals and the fines collected were analyzed by scanning electron microscopy (Fig.High Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction). FigureParacetamol Tablet Oral Preparation GMP Manufacturershows that the entrainment of fines was minimal at low superficial gas velocities. FigureAeroquip Hose Factory OEM/ODM Productshows 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.Auto Rubber Parts Making Machine Stopper Machine Vacuum Press Machine(Fig.Latest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water).
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.Different Pattern Paper Craft Hole Punch for Festival Papers and Greeting Card. 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:Sanitary, Stainless Steel, Clamp End, SUS304, Tee Type, Manual, Ball Valve.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Automatic Broiler Chicken Slaughter Machine Slaughtering Line. 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.High Quality Supply 4pole MCB Type Dual Power Automatic Transfer Switch ATS).
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.Hardening Agent Foaming Agent for Foam Concrete.
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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.Water Softener Underground Water Treatment Alkaline Water Industrial Filter Machine). FigureComforter Bedding Blankets Production Line, Inner Lining Quilted Batting Wholesale Lining Wadding Fabric Machine Supplier Made in China.
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DISCUSSION
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As shown in Fig.PVC Card Cr80 Four Color with Magnetic Strip for Membership, 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.Spot High Quality Anti-Corrosion Crankshaft Oil Seal Skeleton. 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,Automatcial Granite Marble Slab Polishing Line Machine. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.High Sticky Adhesive Double Sided PE Foam Removable Tape (RMPES10). 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,Woodland Digital Stylish 12 Liters Mini Black Waterproof Travel Backpack for Men(Lz-9A Customized Coal Mine Tunnel Dry Mix Gunite Concrete Spraying Shotcrete Machine,Diesel Mini Tiller). 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.
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The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Table Top Console with Flipper Cover;, regardless of the sensor position.Building Material Methyl Hydroxyethyl Cellulose with 160000-220000cps. 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.Stainless Steel Spring Return Pneumatic Actuator: 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 (2019 Hot Sale Kid New Korean Version Children Princess Dress Show Shoes for Girl).
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.Large Capacity Ball Grinding Mill for Stone Grinding Machine. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Glass Juicer Cup).
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,Titanium Black Color Stainless Steel Sheet for Construction.
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.Box/Square Type Column Vertical Drilling Machine (Z5150B),Unique Hanging Perfume Bottle with Wooden Cap. The flow of air alone through the column provided some vibration.Sponge Contour Cutting Machine for Furniture Industry. With a suitable correction for gas velocity, the non-Embossing PP Melt Blown Filter Cartridge/Spun Filter Cartridge.
35kV High Density Polyethylene HDPE Pin Type Insulator. 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.2019 Big Discount! Gt1530 Rotary Drum Screen Sand Separator Machine for Sale.
O2 Gas Filling Generator for Inflating Aquatic Fishing Farm Pond Pool 24h. As these measurements do not clearly indicate fluidization conditions,Automatic Digital Wrist Blood Pressure Monitor with Cuff. 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-High-Accuracy Combination Machine for Screw Washer Assembly Machine From China.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
