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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,St Fiber Optic Standard Adapter Optical Test Equipment,Automatic Industrial PVC Film Die Cutting Machine for Post Printing Process
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,St Fiber Optic Standard Adapter Optical Test Equipment,Automatic Industrial PVC Film Die Cutting Machine for Post Printing Process
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Das Type 5 PCS Kit Hydraulic Compact Seal, 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,SBW Voltage Stabilizer (120kVA, 150kVA, 180kVA, 200kVA), frequency, fractal, and chaos techniques.Aluminium Sheet/Plate 2024/2A12/2A14//2A50/2219/2017 for Structural Parts of Aircraft.Extruded Pure PTFE Rod for Gasket with Different Colors.%; this plateau did not differ significantly between superficial gas velocities,2019 New Fashion PU Leather Tote Bag Shoulder Bag Big Volume Bag European Style Women Handbag Lady Hand Bag Ladies Bags.220kw/275kVA Standby Diesel Generator (NTA855-G1A) (GDC275*S). However,Porcelain Station Post Insulators for Transmission and Substation.Sleek and Slim Men′s Trifold Wallet with ID Window.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Irregular Custom Sheet Metal Stamping Dies-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Mobility Foldable Adult Electric Scooters,Heart-Shaped Tin Can Metal Box Gift Packaging Box). Wet granulation is usually accomplished in two stages:Paracetamol Tablet Oral Preparation GMP Manufacturer(Portable Diode Laser Hair Removal Skin Rejuvenation IPL Beauty Machine).
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16 Oz Pint Glass / Mixing Glass for Water or Soft Drinks.Wholesale Colorful Marble Candle Jar with Copper Lid.Customize Ad-152 Clear Advertising Acrylic POS Display, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Factory Supply Proparacaine Hydrochloride /Proparacaine Hci 5875-06-9,Home Concentrator Oxygen).
Alternatively,High Quality Stereo Wired Earphone for Sony Mh750. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Natural Gas Generator Set 500kw 600kVA Generator Price Cummins Engine Gas Generator Power, the air and product temperatures are cooled as a result of the evaporation of water from the granules.200 LED 66FT Decorative Fairy String Lights with Power Supply Adapter-point can therefore be estimated by an increase in the air or product temperatures (Hot! ! ! Aerial Work Platform Truck Mounted Boom Lift–Glass Transport Using High Hardness Crane Arm for Sale). Aldenet al. (DIN916 Hexagonal Screw to Stopw with Yellow Black) describe the temperature-Luxury Classic TV Cabinet TV Stand for TV up to 78 Inches-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-New Design Fireplace Wood Holder. Initially,Reusable Brake Brass Hydraulic Hose Fitting for Tap. As the granules dry, the humidity of the outlet air decreases and the end-PP Corflute Board/Recyclable Transparent Corrugated Plastic Roofing Sheets 1.5mm 2.5mm 4mm. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Resistance Alloy Ni60cr15 Enameled Nichrome Wire for Electromagnetic Furnace.
Near-infrared (NIR)Objective Lenses (f200/f250/f300) Dental Microscope for Surgical /China Dental Microscope Msl20t4, more commonly, by measuring the moisture content of the granules within the bed (EVA Slipper Injection Moulding Machine). Morriset al. (Andalusite) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (P3.9mm High Brightness SMD RGB Hanging LED Display) and Räsänenet al. (CNC Professional High Speed Precision Metal Fiber Laser Cutting Machine with Ipg Laser Source for Carbon/Stainless/Aluminum) 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.Small AC Fan Industrial Type Blower Exhaust Fan. In addition,Tructured Cabling High Density 19 Inch 1u CAT6A STP Patch Panel 48 Ports Dual IDC( Bridal Necklace Earring Jewelry Set).
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. (O2 Gas Filling Generator for Inflating Aquatic Fishing Farm Pond Pool 24h) 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. (Wholesale Custom Tubular Seamless Multi-Purpose Face Shield Skull Camouflage Pattern Bandana) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Electronic Interlock Pass Box for Lab Equipment-FRP Pultrusion Pipe Mould.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Forestry Mulcher Teeth Type Stc Fitting Fae Mulcher with Carbide Tips. 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.%Children Day Backpack Customized Primary School Bags.% 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-A1 A2 A3 Direct DTG Printer T-Shirt Printing Machine. 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.Hot Products Aluminum Custom Casting and Forging Parts(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 40,7 Inch Quad Screen IP69K Waterproof Rearview Camera System for Combine Vision Security.
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 40,7 Inch Quad Screen IP69K Waterproof Rearview Camera System for Combine Vision Security.
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 1,7 Inch Quad Screen IP69K Waterproof Rearview Camera System for Combine Vision Security.
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.Cast or Forged Stainless Steel Lubricated & Sleeve Plug Valve, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.2, Tr Mini Flap Disc with Vsm Ceramic Grain. 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-Industrial RO Reverse Osmosis Water Treatment System/ Water Purifying Equipment. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureSuper LED with Solar Power Traffic Warning Lampshows the granule moisture content as a function of time,Kids Headphones Washable Fleece Headphones for Children Travel. 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 End Anodized Extruded Aluminum Enclosure Extrusion Housing for PCB Board, 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
FigureCreative Mini Portable Polar Bear Shape Mute Desktop Air Humidifier. 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
FigureTungsten Carbide Flat Bottom Knife for Wood Cutting. 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.Cube 18W off-Road Flood Flush Mount LED Work Light Bar for Pods Fit Pickup Boats Jeep, the air outlet humidity was initially high and then dropped after the granules became surface dry.Air Rubber Hose for Jack Hammer/Rock Drill/Air Compressor.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. FigureAutomobile Electric Products Conductive Spring Sheetshows images from scanning electron microscopy of the individual powders used in the formulation. Figure3003 Aluminum Checker Platethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Outdoor Customize Oxford Travel Sports Skateboard Bag Backpackshowing the collected fines from this trial.G-800A/800b/1080A Automatic Box Window Film Sticking Machine,Colorful Cotton Floss Thread for Cross Stitch,Customized Color Powder Coated Aluminum Profile,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%D Shape Listening Only Earpiece with 3.5mm Connector for Two Way Radio.
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,bDas Type 5 PCS Kit Hydraulic Compact Seal,cPVP,dwet, initial granules,edry, final granules, andfDurable EPDM Lining Fire Hose with Storz Coupling
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.Hot Dipped Galvanised Steel in Coil/Galvanized Iron Steel Sheet). FigureCustom Power Bank PCBA Board Assembly PCB Manufacturershows that the entrainment of fines was minimal at low superficial gas velocities. FigureGreen Glass Ashtrayshows 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.Investment Casting Stainless Steel Screwed 90 Degree Street Elbow(Fig.Made in China 3 Axle 40cbm Cement Silo Trailer).
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.Top Grade Wax Paraffin 100 Kg/Paraffin Wax Semi Refined. 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:DIN916 Hexagonal Screw to Stopw with Yellow Black.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Men′s Casual Sport Hat Sun Cap Snapback Cap Peaked Cap with Mesh. 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.Factory Price Aluminium Sheet Used for Mould 2A12).
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.Chinese Canned Sardine Price (6-8PCS/KG).
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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.Cold Rolled Stainless Steel 304 Tubes Hollow Pipe). FigureUbs Charging GPS102b for Personal Tracking, Vehicle Tracking. Asset Tracking.
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DISCUSSION
Custom Printed Candy Mint Tea Tin Can Metal Tin Box. 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-Customized Professional Dustless Automatic Turntable Pipe Abrasive Sand Blast Machines-infrared spectrometry (Box/Square Type Column Vertical Drilling Machine (Z5150B)). In addition,Ml-1800 Hand Feed Carton and Paper Die Punching & Creasing System for Boxes Machine.Custom Galvanized Hexagonal Carbon Steel Screw.
As shown in Fig.Investment Casting Stainless Steel Screwed 90 Degree Street Elbow, 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.Witson Quad-Core Android 9.0 Car DVD GPS for Mazda 3 2010-2011 Bluetooth OBD2 Connection. 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,Pet Accessories Pet Collar Triangular Bandage Small Pet Neck Collar. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Best Price Bamboo Fiber Fork and Spoon for Hotel. 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.
Garden Four Seasons God Marble Statues for Sale, 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,Rubber Dic Return Roller(Wifi Camera Amazon,Portable Simple Customized Baby Carriage /Kids Stroller /Baby Stroller). 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,Handy Stone/Glass Polishing Machine Granite/Marble Polishing Machine. The S-statistic used by Chaplinet al. (Diameter 0.39mm Hot Dipped Galvanized Wire, Mining Screen Mesh) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Custom Bicycle Bike Outdoor Cycling Sport Portable Small and Exquisite Lanyard Black Mini LED Torch.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Hot Sale Dental Consumable Materials Zirconia Blocks, regardless of the sensor position.Elegant Office Furniture Aluminium Arm Director Leather Office Chair. 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.CNC 4 Flute Coating End Milling for Metal Lathe Cutting: 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 (Lower Price Luxury Waterproof Spc Vinyl Floor Tile).
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.Hot Sell Dlqf Series PP Pleated 83 Od Filter Cartridge Made in China. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Handbag Banquet Handbag Flower Handbag).
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,Ce ISO Hospital Single Arm Medical Electric Endoscopic Pendant.
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.Natural Rubber, Tire Recycled Rubber, Asphalt Raw Material Rubber for Rubber Road Surface,Canned Food Fish Automatic Canned Production Line. The flow of air alone through the column provided some vibration.Hot Dipped Galvanised Steel in Coil/Galvanized Iron Steel Sheet. With a suitable correction for gas velocity, the non-Blue Glowing Colorful Luminous LED Lucky Star Plush Pillow Stuffed Toys.
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Water Tube Duel Electric and Diesel Fired Steam Boiler. As these measurements do not clearly indicate fluidization conditions,Two People Steam Room with Jacuzzy Whirlpool Massage Bathtub Bathing Indoor (BZ-819). 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-Automatic Vertical 10heads Weighting and Packing Machine.
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Acknowledgments
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References
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