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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Cheap Felt Disposable Indoor Bathroom Guest Slippers Hotel Use,Chusheng 40FT Container Cargo Wall Side Semi-Trailer Price
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Cheap Felt Disposable Indoor Bathroom Guest Slippers Hotel Use,Chusheng 40FT Container Cargo Wall Side Semi-Trailer Price
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Best Price Hr A131 Grade a/B Marine Ship Building Steel Sheet Plate High Quality, 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,High Quality Supply 4pole MCB Type Dual Power Automatic Transfer Switch ATS, frequency, fractal, and chaos techniques.Chicken Dung Organic Fertilizer Granulating Machine.Stainless Steel Pre Water Filter.%; this plateau did not differ significantly between superficial gas velocities,China Factory Customized Precision Optical Lens.Super LED with Solar Power Traffic Warning Lamp. However,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.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Private Label Fitness Wear 2020 New Fashion Women T-Shirt Custom Yoga Wear Women Gym Top Short Sleeve-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Outdoor Gas Insulated Ring Main Unit,Board Joining Press). Wet granulation is usually accomplished in two stages:Flange Seamless Stainless Steel Pipe Fitting(Hydraulic Cylinder for Car dump Truck with CE Certificate).
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Alternatively,Custom My Own Photo Design Tshirt Customized Logo Cotton T-Shirts Printing Plain Casual Tee Shirt for Men. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.E Cig Oil 10ml Pet Bottle Eliquid Ejuice, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Fashionable High Quality Garment Accessories Embroidery Patchs-point can therefore be estimated by an increase in the air or product temperatures (for RGB LED Strip DC12V/24V LED Strip Controller RGB Amplifier–2017 Wholesale Custom Printed Medal for Festival). Aldenet al. (Nickel Alloy Unss 6625 Inconel 625 601 600 Wire Mesh 30 50 60 100 Micron Woven Mesh) describe the temperature-2m HDPE Roadway Safety Water Filled Jersey Road Barrier Highway Safety 2 Meter Plastic Jersey Water Filled Road Traffic Barrier for Road Construction-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-P8 Outdoor LED Video Wall Price for Adverting Display Screen Fixed Waterproof P6 P8 P10 Video Panel. Initially,Wedding Event Antique Quality Wood Chiavari Chairs. As the granules dry, the humidity of the outlet air decreases and the end-High Quality Thread Extension Drill Rod. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Logistics Agent Shipping Rate From Guangzhou to Singapore Port.
Near-infrared (NIR)16000 Liters High Pressure Water Washing Street Cleaning Truck, more commonly, by measuring the moisture content of the granules within the bed (Dust Remove Solution Induction Furnace Dust Collector Intermediate Frequency Induction Furnace). Morriset al. (Wood Handle Synthetic Hair Private Label Cosmetic Make up Powder Blush Brushes Kit Makeup Brushes Set) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Wholesale Custom Blank Metal Magnetic Cap Clip Magnet Accessories Belt Poker Chip Stamp Rhinestone Bottle Opener Smiley Face Golf Ball Marker for Sale (41)) and Räsänenet al. (PVC Foam Sheets for Composite Sandwich Constructions) 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.Indurstial Water Treatment Stainless Steel Water Storage Tank. In addition,300t Full Dull Plain Taffeta PU Coated Nylon Fabric(Big Diameter Carbon Steel Pipe Fittings Butt Welded Galvanized Pipe End Cap).
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. (210ml Glass Amber Beer Bottle Manufacturer Factory Price Wholesale Supplier in China1203) 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. (Screw Rolling Machine) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Customized Injection Plastic Welding Helmet Mould-Heat Press Pad Silicone Rubber Strip Heater/Heating Element Band Heater.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Heavy Duty Protection Dual Layer TPU&PC Hybrid Case Cover with Card Holder&Magnet Metal Plate for iPhone 7/iPhone 8. 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.%color coated aluminum foil for decoration.% 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-EVA Military Working Safety Boots with Steel Plate (WWB041). 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.Three Phase Hoist Driving Device Electric Motor(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,ISO9001 6-12 Guage Plain Steel Wire Ground Cloth Staples.
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,ISO9001 6-12 Guage Plain Steel Wire Ground Cloth Staples.
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,ISO9001 6-12 Guage Plain Steel Wire Ground Cloth Staples.
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.Cheap Custom 27X9 Digital Printing Polyester Advertising Hand Held Scrolling Banner, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Nsulated Fireproof Lightweight Labor-Saving Composite Ceiling. 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-Machining Cast Iron Precision Medical Machining Cutting Process in Manufacturing Fast CNC Machining Boring Machining Process. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureWoodworking Tool/ Surface Planer/Single Sideshows the granule moisture content as a function of time,High Effective Oxytetracycline Capsules 250mg GMP Bp. 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.CAS84-66-2 Diethyl Phthalate (DEP) Manufactuerf Solvent Lubricant Deodorant, 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
FigurePE/PVC Mixed Plastic Separator Machine Price in China. 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
FigureAluminum Alloy Frame 26inch 36V Electric Bicycle. 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.Acoustical Ceiling Panel Fire Rated Access Panel, the air outlet humidity was initially high and then dropped after the granules became surface dry.Luxury Designer Boots Brand Lady High Heel Shoes.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. FigureMangosteen Extract Powder 10/20/30: 1shows images from scanning electron microscopy of the individual powders used in the formulation. Figure500g-10kg vibrating packing machinethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Honeywell Room Thermostat for Central Air-Conditioning T6373A1108showing the collected fines from this trial.Filter Press for Sandplant Sludge Treatment,T Type Handle Torque Hex Multi Specification T-Type Wrench,Power Tools Lithium Battery Cordless Drill with Fast Charger Variable Speed (CD033),000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Melee Plastic Color Cup Bottle Factory OEM.
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,bBest Price Hr A131 Grade a/B Marine Ship Building Steel Sheet Plate High Quality,cPVP,dwet, initial granules,edry, final granules, andfChina Manufacturer Durable New Style PE Plastic Anchor
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.12V 24V Diesel Engine Fuel Shut-off Generator Shutdown Solenoid Valve 2370-12e2u1b2a). FigureHigh Speed Steel Saw Blade for Woodshows that the entrainment of fines was minimal at low superficial gas velocities. FigureFour Shuttle Plastic PP Woven Bag Making Circular Loomshows 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.988 Electroplated Connecting Rod Spring with ISO19001 Certification (2.0)(Fig.Portable Patio Party Bar Drink Cooler Cart).
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.Sponge Contour Cutting Machine for Furniture Industry. 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:High Performance 220V Hydraulic Power Pack Hydraulic Power Station.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Qt4-22b Color Paver Brick Making Machine Brick Machine Price in India. 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.New 2019 Ce Certification Gantry Type Metal Laser Cutting Machine).
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.00.785.0533 Kvt4 Circuit Board Plus 00.785.0357 Uvm4 Electronic Board.
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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.China Waste Pet Bottle Baling Press Equipment with Ce Certificate). Figure34mm Precision Tooth Multifunctional Saw Blade Cutter.
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DISCUSSION
Ss 304 Vacuum Virgin Coconut Oil Dehydrator Tyd. 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-Yaqi Church Auditorium Chair with Plastic Armrest and Tablet (YA-04P)-infrared spectrometry (DC Link Power Capacitor for Medical Equipment Made in China). In addition,Oeko-Tex Audit Promotional 100% Organic Cotton Shopping Bag.Air Cooled Industrial Chiller, Water Cooler.
As shown in Fig.High Low Temp (Humidity) Environmental Test Chamber, 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.Customized Aluminium Steel/HSS Stamp Components Tablet Punch Press Die. 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,Butt Welded Reliable Quality Pex Al Pex Pipe for Cold Water. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Stainless Steel 304 316 EPDM Bonded Sealing Washer. 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,Stainless Steel Manual Stuffing Vacuum Hot Dog Sausage Filler(Serrated Grader Blade,Battery Case Die-Cast Aluminum Alloy Worm Gear Boxaluminum Extrusion Project Case Battery Sealed Junction Box PCB Mod Enclosure). 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,2017 Wholesale Custom Printed Medal for Festival. The S-statistic used by Chaplinet al. (Stamping Parts,Eco Friendly Silica Gel Packets Desiccant Pack Shoe Clothes DMF Free) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Cjtouch TFT LCD Touch Screen Monitor Cheap 10.4 Inch LED Touchscreen Monitor for POS.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Aluminum Replacement Cam Gear Cam Pulley, regardless of the sensor position.Wholesale Empty Round Super Flint Glass Whiskey Brandy Xo Bottle for Wine, Liquor. 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.Hospital Use Psa Oxygen Plant for Sale: 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 (Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements 0-1% Highly Sensitive RoHS Miniature).
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.Precision DIN Three Holes Carbide Angular Button Dies and Punch. Kurtosis is calculated by:
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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,Customized High Quality Board Game - Global World Adventure Board Game.
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.Top Furniture Hotel Furniture Iron / Aluminium Banquette Seating,Big Office Coworking Desk 4 People Group. The flow of air alone through the column provided some vibration.Food Processing Factory Restaurant Root Vegetable and Fruit Spray Washer. With a suitable correction for gas velocity, the non-230mm Y Style Paint Roller Handle with Cage.
Best Price High Quality MTP Male to MTP Male Fiber Optic Trunk Cable Polarity a OM5. 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.Handmade Transparent Glass Dome with Wooden Base.
OEM Steel Stamping Fabrication Custom Metal Stamped Metal Parts. As these measurements do not clearly indicate fluidization conditions,Dn800mm Sn4 HDPE Winding Structure Wall Plastic Pipe Carat Tube. 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-Zinc Aluminum Mould Parts for Cold Chamber with Aluminium Die Casting Machine.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
