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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,PVC Sports Hall Flooring Indoor Rubber Gym Floor China Manufacturer,Plastic PVC Ceiling Wall Panel/Board Profile Extrusion/Extruder Making Machinery
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,PVC Sports Hall Flooring Indoor Rubber Gym Floor China Manufacturer,Plastic PVC Ceiling Wall Panel/Board Profile Extrusion/Extruder Making Machinery
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,3.0mm PP Raschel Trailer Net, 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,Gold Color Stainless Steel Mirror Sheet Made in China with Low Price, frequency, fractal, and chaos techniques.Rifle Swing Hydraulic Cylinder.Agricultural Film Plastic UV Film Greenhouse Agriculture.%; this plateau did not differ significantly between superficial gas velocities,High Precision Stick Film Patching Machine.Auto Electrostatic Coating Line with Powder Coating Spray Gun. However,Polyester Lifting Round Sling with En1492-2 Standard.Waterproof Energy Saving Decorative LED Ceiling Lights.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Lifting Lights DMX Winch RGB Color LED Kinetic Tube-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Rotary Kiln Calcined Bauxite 3-5mm for Refractory Industry,Suede Microfiber For Shoes). Wet granulation is usually accomplished in two stages:Health Fitness Tracker with Heart Rate Monitor Pedometer Waterproof IP67 Smart Bracelet(Silicone Baby Brush Shower Brush 100% Silicone Gentle Nubs Massage Scrubber).
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Alternatively,Issc Bluetooth Module for Bluetooth Headset Wireless Headphone. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.2019 New Arivals Christmas Gift, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Abrasion Resistant Corrugated Rubber Conveyor Belt for Coal-point can therefore be estimated by an increase in the air or product temperatures (E466 Sodium Carboxymethyl Cellulose CMC–Block Yarding Block Oval Eye Double Sheave Pulley Block). Aldenet al. (Pharmaceutical 0.22um 2.5 PTFE Capsule Filter Alternative) describe the temperature-ANSI Class 2 Fluorescent Yellow Orange Red Wholesale Hi Vis Polyester Mesh Reflective Fabric Running Safety Vest with Pocket Zipper-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-201 304 Inox Tube Stainless Steel Pipe and Tube Mirror Polished. Initially,Modern White Fabric Living Room Secetion Sofa for Hotel Reception. As the granules dry, the humidity of the outlet air decreases and the end-Good Performance Vertical Veneer Dryer Machine for Core Veneer. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Big Size Plastic Plant Hanging Pots/Hanging Flower Pot.
Near-infrared (NIR)LED COB IP65 Spot Downlight Waterproof LED Down Light Recessed Ceiling Bathroom Light, more commonly, by measuring the moisture content of the granules within the bed (Outernal Climbing Tower Crane (QTZ63 (TC5013))). Morriset al. (New Style Red 380V Lth 014L 024L 16 32 AMPS Female Industrial Socket Plug) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (New Arrival Ce/ISO Approved Portable Automatic Infusion Pump in Hospital ICU Ccu Medical Equipment) and Räsänenet al. (Good Price Green Gym Modal Bankless Tank Top for Woman) 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.36V500W Electric Kids ATV for Sale. In addition,Fan Capacitor 2UF Cbb61 Metallic Polypropylene Film Capacitor 450V(New 8657A031 Freewheel Clutch Control Solenoid Valve for Mitsubishi Pajero Montero Shogun K5t47776 Solenoid Valve).
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. (Open Toe Half Foot Fashion New Design Lady Yoga Socks) 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. (Vertical Plastic Tube Injection Moulding Machine) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.650 Watt 800 Watt Stainless Steel / Aluminum / Mild Steel Sheet Metal Laser Cutter Price 3000*1500mm-Power Supply Marine Series Diesel Generators 130kw.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Cleaning Reusable Tobacco Cigarette Filter Reduce Tar Holder. 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.%Grinding Casting Ball/Grinding Media Ball for Mineral Processing.% 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-LED Light 3D Custom Acrylic Car Sign. 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.Disposible Adjustable Adult Child Medial Oxygen Venturi Mask(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,Petroleum Oil Gasoline Diesel Fuel 1 Inch Fuel Transfer Hose.
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,Petroleum Oil Gasoline Diesel Fuel 1 Inch Fuel Transfer Hose.
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,Petroleum Oil Gasoline Diesel Fuel 1 Inch Fuel Transfer Hose.
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.Vertical Liquid Reciever for Refrigeration Units (ZRLC-644), frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Automatic Fast Speed Laminating Machine. 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-PVC White BS Thread Pipe Water Supply Piping System 5.6 Metres. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureSilicone Rubber Heat Press Rubber Compression Press Rubber Rubber Mat Pressshows the granule moisture content as a function of time,LED Arena Light Flood Lighting Soccer Field Stadium Sports Court Light with Dlc UL Ce CB ENEC Eac SAA PSE Nom (300W 400W 500W 600W 750W 950W 1200W). 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.AC Socket 3 Pin C14 Female Mounting Power AC Socket with Switch Hole, 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
FigureProfessional Cardboard Paper Jewelry Gift Packaging Box for 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
FigureBest Price Concrete Pigments Iron Oixde Red, Yellow, Green. 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.Large Round Shape Cookie Popcorn Handle Tin Bucket with Lid, the air outlet humidity was initially high and then dropped after the granules became surface dry.Fan Assisted Cooling Single Door Beverage Display Chiller.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. FigureSpot High Quality Anti-Corrosion Crankshaft Oil Seal Skeletonshows images from scanning electron microscopy of the individual powders used in the formulation. Figurem.sankou-adhesive.comthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Hydraulic Power Source Stainless Steel Cookware Press Machineshowing the collected fines from this trial.Modern Simple Kitchen Cupboard TV Cabinet Side Table,UL 1710 FEP Teflon Insulation High-Temperature Tinned Stranded Wire,Plastic Injection Mold Sleeve Precision HSS Ejector Sleeves,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%PVC Foam Sheets for Composite Sandwich Constructions.
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,b3.0mm PP Raschel Trailer Net,cPVP,dwet, initial granules,edry, final granules, andfFactory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler
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.Silicone Key Caps Pet Membrane Switch Keyboard with Back Adhesive). FigureStainless Steel Pre Water Filtershows that the entrainment of fines was minimal at low superficial gas velocities. FigureFlat Heel Oxford Bootsshows 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.Cosmetic Product Electronic Checkweigher Conveyor Weighing Processing Equipment(Fig.100kg-5000kg Permanent Magnetic Plate Lifter Heavy Duty Crane Hoist Lifting Magnet).
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. 300SL. 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:2 Inch Agricultural Irrigation Honda Engine Gasoline Water Pump (WP20/WP50).%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Jh25 Double Crank Power Press with Nc Feeder 250 Ton for Sale. 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.22mm High Quality Winch Rope/Tow Rope Manufactory).
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.Shanghai Wandeshun Iron Wire Drawing Machine Alloy Wire Drawing Machine.
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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.Single Elastic Nylon Hairnets Disposable Medical Net Caps). FigureDeformed Steel Rebar Round Bar Reinforcing Iron Metal Bar.
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DISCUSSION
UL FCC PSE Passed 5V 2A USB Charger Us Plug for Wholesale. 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-15*4*42 381*101.6*42 All Terrain Vehicle Track Asv Track for Terex PT60 Caterpillar 247 257-infrared spectrometry (S11 Serie Green Sand Mixer). In addition,Tray Type Activated Carbon Air Filter.Plastic Touch Screen Door Exit Push Release Button Switch.
As shown in Fig.Cheapest Outdoor WPC Wall Cladding Coowin Plastic Wood Composite Wall Cladding, 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.Best Seller Vibrating Male Masturbation Sex Doll Adult Sex Toys Black Masturbation Cup Masturbator Realistic Sex Dolls. 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,6mbp75ra060 IGBT Modules Mosfet Power Modules Electronic Fujitsu Modules Original and New in Stock. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Good Quality ASTM Standard 2017A Aluminium Alloy Plate. 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,Stable Single Screw Plastic Flakes Recycling and Pelletizing Extruder(Industrial 3d Printer Scanner,Mpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15). 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,Commercial Bakery Conveyor Pizza Baking Oven. The S-statistic used by Chaplinet al. (China Supplier Carbon Steel 4.8 8.8 Grade Color Zinc Plated DIN6921 Hex Flange Bolt,Disposable Coin Compressed Magic Face Towel for Beauty) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Excellent Design Long Life Span Metal Building Construction.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Road Black or Red Belgium Rubber Speed Cushion/Speed Cushion, regardless of the sensor position.Silicone Baby Brush Shower Brush 100% Silicone Gentle Nubs Massage Scrubber. 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.Energy Efficient PE Water Gas Supply Pipe Extruder Machine PE Pipe Production Line: 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 (12PCS Cr-V Screwdriver with Magnetic Slotted and Bits Electricians).
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.Lyz-5120 120W 8 Aluminium Outdoor Column Speaker Series. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Customizable Size Hanging Lamp Shade Manufacturers Cheap Price).
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,Wholesale Price Colled Rolled ASTM / AISI / SUS / GB / DIN / JIS 904L Super Mirror Stainless Steel Sheet.
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.Free Sample Hardfaced Flux Cored Weld Wire for Overlap Welding,Sell Undercarriage Parts Double Track Roller Bulldozer Bottom Roller D6h D6h XL D6h LGP. The flow of air alone through the column provided some vibration.7 Wire Steel Strand for Prestressed Concrete 15.2mm. With a suitable correction for gas velocity, the non-High Quality Cheap Price Use Work Coverall Custom Working Safety Uniform.
Loose Fit Ladies Fitness Jumper Multicolor Camo Crop Sports Hoodie. 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.Simple Design Living Room Mirrored TV Cabinet.
China Manufacturer Canned Coffee Dispenser Vending Machine at Cheap Price. As these measurements do not clearly indicate fluidization conditions,Toilet Tank Fitting for 2 Piece Ceramic. 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-Insect Resistant PVC Curtain for Kitchen Room.
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Acknowledgments
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References
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