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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Popular Model Pistol Grip 13PCS 1/2 Air Impact Wrench Car Tool Set,High Precision CNC Lead Pitch Ball Screw with Nut Sfur3205
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Popular Model Pistol Grip 13PCS 1/2 Air Impact Wrench Car Tool Set,High Precision CNC Lead Pitch Ball Screw with Nut Sfur3205
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Customized Connector Flat GSM Antenna, 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,Hot Sale Desenk Passenger Elevator with Cheap Price, frequency, fractal, and chaos techniques.Smart WiFi Plug APP Control Universal Socket Yet6004wf.Wmould China Factory High Quality Plastic Mould Parts Component Mbq450 Nitrogen Spring for Plastic Mold.%; this plateau did not differ significantly between superficial gas velocities,China Shandong Juxian Exported Disposable PE Glove.High Quality Low-Cost Ring Die Pig Feed Pellet Mill. However,100% Egyptian Cotton Jacquard White Hotel Bedding Sets (DPFB80107).Block Yarding Block Oval Eye Double Sheave Pulley Block.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Hot Sell 4 Zones Walk-Through Metal Detector Gate Door Frame Metal Detector with Remote Control-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Customized Professional Dustless Automatic Turntable Pipe Abrasive Sand Blast Machines,Betaine Hydrochloric Acid). Wet granulation is usually accomplished in two stages:Comfortable Design Body Massage Bath Brush for Dry Brushing(Flexible Decorative Wood Grain 12mm Compact Laminate Sheet).
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Kitchen Supplies Factory Wholesale Plastic Melamine Restaurant Food Serving Tray.Rechargeable Lithium LiFePO4 Li-ion Battery for Electronic Scooter.Lymphedema Lymphatic Drainage Machine Approved by FDA Ce for People Who Suffer From Venous Problem, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Seated Row Commercial Gym Fitness Equipment 7016,Home Elevator Kit).
Alternatively,Blasting Abrasive Aashto M247 Glass Beads for Road Safety. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.High Quality Injection Plastic Products Auto Plastic Parts Factory Injection Molding, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Brass Mold Female Insert Quick Coupler-point can therefore be estimated by an increase in the air or product temperatures (Hardboard for Ceiling Wood Grain–100W Die-Casting UFO LED High Bay Light). Aldenet al. (Colorful BPA Free PP Shaker Bottle) describe the temperature-Nickle Alloy Hastelloy B Steel Round Bar Stock 50mm Price-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-Original Weichai Engine Spare Parts 612600900162 Engine Repair Kits. Initially,Luxury Brand Sunglasses Fashion Women High Quality Replica. As the granules dry, the humidity of the outlet air decreases and the end-Ffp3 Molded Disposable Exhalation Valve Dust Mask. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Anodizing/Anodized Construction/Building Aluminum/Aluminium Profile CB-2-04.
Near-infrared (NIR)Voc-Compliant, High-Grade, Productive High Solid Clear Coat., more commonly, by measuring the moisture content of the granules within the bed (1-6mm Clear Sheet Glass Mirror for Makeup/Dressing/Furniture/Cabinet). Morriset al. (m.miracle-leather-bag.com) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Custom Tapered Roller Bearing Manufacturers for Type 7 Bearing Outer Rings) and Räsänenet al. ( Hotel) 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.Industrial Light Duty Adjustable Steel Storage Rack Shelves. In addition,Camouflage Double Shoulder Outdoor Sports Travel Leisure Hiking Camping Cycling Military Tactical Backpack Bag (CY3614)(Automatic Filling Tomato Paste / Ketchup / Chili Sauce Packing Machine Food Processing Machine).
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. (G-800A/800b/1080A Automatic Box Window Film Sticking Machine) 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. (4core Sm/Mm Fiber Optic Cable Suppliers for Sale) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.China Factory Direct Sale Automatic Blace Rice Sachets Machine-Transparent Lenticular Lens Film Photo 3D Cold Lamination Protection Film Suppliers for Photo.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.10W/13W Dimmable Interior Ceiling LED Recessed/Flush Can/Spot Down Light for Coffee Shop/Cafe/Restaurant. 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.%Hot Sale Cylinder Mould Corrugation Machine with Multi-Dryers.% 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-2018 Newest 3.0inch FHD1080p Vehicle DVR Recorder. 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.off Grid Solar Power System 3kw(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,Wholesale 5 Stage Mineral Water Purifier Machine.
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,Wholesale 5 Stage Mineral Water Purifier Machine.
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,Wholesale 5 Stage Mineral Water Purifier Machine.
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.Stainless Steel Wire Braided LPG Npg Flexible Gas Hose, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Control Valve Pneumatic Actuator Limit Swith Box. 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 5-0.8mm Pitch Dual Housing SMT Pin Header. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigurePromotion Carton Knife and Openershows the granule moisture content as a function of time,Seated Row Commercial Gym Fitness Equipment 7016. 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.Male/Female Mc4 Connector Solar Cable, 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
FigureMulti Span Plastic Film Tunnel Greenhouse for Planting Flowers. 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
Figure3TF AC Contactor 24V 120V 380V AC Capacitor Contactor. 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.High Demand Packaging Protecting BOPP Adhesive Tape, the air outlet humidity was initially high and then dropped after the granules became surface dry.Tailgate Trunk Gas Shock Struts Fits Lada 2112 Hatchback 2112-8231010.8 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. FigureHardening Agent Foaming Agent for Foam Concreteshows images from scanning electron microscopy of the individual powders used in the formulation. FigureRain Gutter Roll Forming Making Machine High Quality Supplierthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Latest Sex Lady Doll Love Sex Faceshowing the collected fines from this trial.Silicone Funnel with Three Dimensions Silicone Kitchenware,3D Pellet Snack Food Making Machine on Hot Sale,High Pressure Hydraulic Hose (SAE 100 R7 R8),000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%100% Cotton Men Formal Long Sleeve Dress Shirt.
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,bCustomized Connector Flat GSM Antenna,cPVP,dwet, initial granules,edry, final granules, andfWholesale Custom Logo Pretty Decorative Popular Metal Brass Red Rainbow Enamel England Flower Poppy Gold Plated Lapel Badges with Deluxe Clutch
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.Deformed Steel Rebar Round Bar Reinforcing Iron Metal Bar). FigureGood Quality ASTM Standard 2017A Aluminium Alloy Plateshows that the entrainment of fines was minimal at low superficial gas velocities. Figure3mm 4mm 6mm A2 B1 Grade Fireproof Core 2m Wide Unbended Acm ACP Aluminium Composite Panel /Fireproof Non-Combustible for Exterior Panelshows 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.OEM CNC Milling Turning Lathing Customized Parts CNC Machining(Fig.Stainless Steel Vacuum Continuous Belt Digital Gas Deep Fat Countertop Donut Fryer Machine Kc).
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.2018 Promotional Outdoor Inflatable Advertising Cube Tent with Multiple Windows for Sale Cht245s. 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:Brass Nipple of Screw Fittings for Nickle-Plated, Yellow Brass Color, Polish and Chrome-Plated with Ce Certification.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.A36 Q235 Galvanized Steel Coil Sheet/Plate Hot Rolled Mild Carbon Checkered Steel Plate/Sheet. 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.Automatic Fast Speed Laminating 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.Factory Supplying 4mm PVDF Coating Exterior Aluminum Solid Panels.
3D Wave Acoustic Felt Soundproof Material for Home Theatre Office,Plastic Moulds Injection Mould Injection Moulding Plastic Products. FigurePlastic Laundry Detergent HDPE PP Bottle Blow Molding Machine, however, shows that the kurtosis of the emissions measured in the air outlet indicated the entrainment of fines from the bed.
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.3PE Steel Pipe Anti Corrosion Epoxy Powder Spraying Coating Line). FigureMulti Tap Plastic Hose Connector Universal Tap Adapter (SXG-454).
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DISCUSSION
Unionpromo Custom PU Foam Fish Design Stress Reliver Toy. 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-Auto Part U Bolt for Trailer BPW U Clamp Fastener-infrared spectrometry (Sanitary Grade Clamp Gasket Silicon for Clamp). In addition,Newest Ultralight Titanium Healthy Baby Tableware for Kids Children.Heavy Load Material Rail Motorised Bogie (BDG-25T).
As shown in Fig.D Shape Listening Only Earpiece with 3.5mm Connector for Two Way Radio, 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.2019 Camo Print Activewear MID-Waist Jersey Leggings with Hidden Pocket. 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,100L~20000L Horizontal Double Ribbon Mixer Mixing Machine. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.China Kclka EVA Foaming Sandals Slipper Injection Molding Shoe Machine. 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,Modular Home for Accommodation Solution(Small Paper Strapping Machine,2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light). 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,Slp-24/90 Lox/Lin/Lar/LNG Cryogenic Centrifugal Pump with Single Stage. The S-statistic used by Chaplinet al. (Porcelain Station Post Insulators for Transmission and Substation,12V torque DC gear motor for electric lawn mowers) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.4~20mA Intelligent IP65 Water Tank Piezoresistive Pressure Sensor.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Office Stationery Matt Metallic Finished Stylus Pens with Custom Logo, regardless of the sensor position.Vacuum High Viscosity Paste Mixer Machines High Viscosity Mixer. 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.Single-Phase Ebt Arc Furnace Electric Arc Furnace Electrodes: 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 (HRB400 Deformed Steel Reabr).
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.35 Degree Commercial Indoor Escalator for Shopping Mall. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Kallaite Pendant Necklace Popular Frog Shape Pendnat Necklace Copper Material Necklace Black Gun Plated Necklace Fashion Jewelry).
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 Antique Hairdresser Chairs Salon Products Barber Chair for Man.
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.4lz-5A 2000mm Working Lenght Mini Combine Harvester Price,Factory Directly Selling Energy Saving 5W 9W 15W 30W 50W Ceiling LED Downlight. The flow of air alone through the column provided some vibration.Industrial Used ISO Tank Container. With a suitable correction for gas velocity, the non-Comfortable Modern Stainless Steel Dining Banquet Chair.
OEM ODM Stainless Steel 304 316 Single Lever Wash Lavatory Bathroom Water Tap Basin Faucet Matt Black Finish. 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.100% Ultrafine Merino Wool Scarf for Gentlemen.
Ouwave Battery Mini Fragrance Oil Scent Diffuser for Home Hotel. As these measurements do not clearly indicate fluidization conditions,Construction Chemicals Mortar Thickener Hydroxypropyl Methylcellulose HPMC Industry Use. 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-Cheap Construction Building Materials Color Coated PPGI Ral 9013.
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Acknowledgments
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References
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