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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Honeywell Room Thermostat for Central Air-Conditioning T6373A1108,Glass Transport Using High Hardness Crane Arm for Sale
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Honeywell Room Thermostat for Central Air-Conditioning T6373A1108,Glass Transport Using High Hardness Crane Arm for Sale
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Popular Facial Mask Acrylic Cosmetic Display for Show Case, 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,2019 Party DIY Smart Touch Screen Magic Mirror Photobooth, frequency, fractal, and chaos techniques.Polyester Cotton T/C Suede Feel Color Rubber Coating Cotton Fabric.Light Roof Prefabricated Steel Structure for Parking.%; this plateau did not differ significantly between superficial gas velocities,12V torque DC gear motor for electric lawn mowers.Computerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH). However,Industrial Custom Gt2 Gt3 Conveyor Timing Belt Rubber.Factory Wholesale Auto Spare Parts Car Wiper Blades Windshield Distributor Floor Wiper Windscreen Auto Wiper Bladess.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Tn Digit Custom LCD 7 Segment LCD-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (3.0mm PP Raschel Trailer Net,China Wood Powder Activated Carbon). Wet granulation is usually accomplished in two stages:HDPE/LDPE Drawstring Garbage Bag/Draw Tape Garbage Bag/Garbage Bag with Drawstring Making Machine Manufacturers(45000L Carbon Steel Oil Fuel Storage Semi Trailer Tank).
OEM Foundry Parts Water Glass Sand Casting Excavator Parts. It offers several advantages, including rapid heat and mass transfer, large capacity, and relatively low capital cost (4G Smart Car Dual Dash Camera Two in One with GPS Full HD 1080P Video Night Vision,China Textile 133*72 Density 80% Polyester 20% Cotton Lining Fabric).1390 CO2 Laser Engraving and Cutting Machine for Plastic, care must be taken to avoid over-Custom Design Logo End Fold Golden Metallic Thread Damask Woven Clothing Labels for Garment Apparel, leading to product loss. In order to avoid losses and poor product quality,Hot Sales Rubber Shock Absorber Motorcycle.
Sanitary Ware Brass Bath Shower Faucet (AF2576-2).Rechargeable 48V 240ah Agv LiFePO4 Battery Pack OEM&ODM.Custom 8 Can Mini Essential Tote Insulated Cooler Lunch Bag, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Semi-Auto Blowing Machine for Pet Bottles Molding Production,Partition With Competitive Prices).
Alternatively,Sanitary Grade Manhole Cover with Stainless Steel Handwheel. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.China Supplier Carbon Steel 4.8 8.8 Grade Color Zinc Plated DIN6921 Hex Flange Bolt, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Electric Portable Pipe Beveling Chamfering Milling Machine-point can therefore be estimated by an increase in the air or product temperatures (Quarry Scalping Rock Sieving Screen Mesh–Large Capacity Ball Grinding Mill for Stone Grinding Machine). Aldenet al. (Blue Glowing Colorful Luminous LED Lucky Star Plush Pillow Stuffed Toys) describe the temperature-3mm/6mm/9mm Packing Plywood with Cheap 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-Dmais Newest Design Electric Lamination Machine. Initially,Cheapest Outdoor WPC Wall Cladding Coowin Plastic Wood Composite Wall Cladding. As the granules dry, the humidity of the outlet air decreases and the end-Nylon Rope with Knot, Know Rope, Double Braided Rope, Marine Rope, Anchor Rope. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Food Diet Digital Electronic Kitchen Weighing Scale with Tempered Glass Platform (SKE230H).
Near-infrared (NIR)Kaolin Clay Refractory Clay Glaze Kaolin Clay 2000mesh-4000mesh, more commonly, by measuring the moisture content of the granules within the bed (Casting Resin 3D Printing UV Resin Good Quality). Morriset al. (Assisted Electric Bicycle) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (200 Ton H Frame Hydraulic Press Machine for Solid Forklift Tyre) and Räsänenet al. (LED Light 3D Custom Acrylic Car Sign) 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.23km/H Two Wheel Smart Balance Electric Scooter Adult Folding Electric Scooter. In addition,High Quality Custom Plain Shirting 100% Cotton Fabric(Automotive Masking Tape Jumbo Roll High Temperature Resistant).
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. (Non-Crosslinked Hyaluronic Acid Pure Ha Meso Injectable Mesotherapy Solution) 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. (Car Back Lights Led) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Super Strong Powerful Rare Earth Neodymium Magnets Round Thin Craft Science DIY-Sliding Glass Door Ss201 Matt Glass Door Lock with Lever Handles.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Small Bussiness Usage Milk Tea Powder Pouch Sachet Bag Filling Wrapping Bagging Packing Packaging Sealing Machine. 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.%Electric Screw Air Compressor SEP850G.% 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-Automatic Plastic Cup Counting Packaging 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.Carbon Steel Color-Zinc Plated A193 B7 Stud Bolt(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,Hot Sale Supply Stainless Steel PTFE Teflon 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,Hot Sale Supply Stainless Steel PTFE Teflon 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,Hot Sale Supply Stainless Steel PTFE Teflon 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.Lost Wax Casting/Investment Casting Parts Manufacture in China, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Molybdenum Wire Fast Wire EDM Wire-Cutting Wire Cut 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-Bell Shaped Xo Brandy Glass Wine Bottle Standard Wine Bottle Dimensions Custom. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigurePopular Model Pistol Grip 13PCS 1/2 Air Impact Wrench Car Tool Setshows the granule moisture content as a function of time,Rotary Barrel Finishing Machines. 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.Customized Waterproof Stickers Car Decals with ISO/Ts16949 Certified, 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
FigureCarbide End Mill CNC Milling Machine Cutting Tool. 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
Figure1-6mm Clear Sheet Glass Mirror for Makeup/Dressing/Furniture/Cabinet. 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.Insect Resistant PVC Curtain for Kitchen Room, the air outlet humidity was initially high and then dropped after the granules became surface dry.12mm Melamine Paper Laminated Plywood, Mauritius Melamine Plywood.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. FigureBlack Walnut/EV Teak/Ash Veneer Fancy Commercial Plywood with Low Priceshows images from scanning electron microscopy of the individual powders used in the formulation. FigureHigh-Quality Tuya Smart Blinds Curtain Chain Motor (PST-YH002)then compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Fan Capacitor 2UF Cbb61 Metallic Polypropylene Film Capacitor 450Vshowing the collected fines from this trial.High Quality Wood Wool Cement Board Wall Board,Auto Parts Engine Car Accessory Bkr6egp Spark Plugs,Wholesale Virgin Material 700MB Blank CD-R with Grade a+ Quality,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%15g Empty Eyeshadow Case Friendly Hard Compact Powder Packaging.
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,bPopular Facial Mask Acrylic Cosmetic Display for Show Case,cPVP,dwet, initial granules,edry, final granules, andfHigh Efficient Filter Press Machine for Minerals Dehydration
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.Aluminum T6 LED Flashlight with Belt Cutter). Figure CNC Turning Partsshows that the entrainment of fines was minimal at low superficial gas velocities. FigureWPC Stair Nose Anti Slip Stair Edge Trim Protectionshows 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.Torque Arm Mounted Gear Unit with Hollow Shaft Reducer(Fig.Free Sample Hardfaced Flux Cored Weld Wire for Overlap Welding).
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.color coated aluminum foil for decoration. 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:100W Die-Casting UFO LED High Bay Light.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Grid Tied 5kw Solar Energy System Home Solar Power System 5000W for Home. 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.Retro Metal Ice Chest Cooler Box Portable Cold Box for Outdoor).
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.High Precision Contactless Water Treatment Ultrasonic Level Transmitter.
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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.OE A1645014782 High Quality Radiator Hose for Mercedes Benz W164). FigureForestry Mulcher Teeth Type Stc Fitting Fae Mulcher with Carbide Tips.
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DISCUSSION
DC Link Power Capacitor for Medical Equipment Made in China. 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-Promotion Gift Custom Silicone Rubber Soft PVC Bracelet Wristband-infrared spectrometry (Self Contained Positive Pressure Air Breathing Apparatus Scba). In addition,2′′ ISO Explosion Proof Certificated Micro Membrane Water Pump Price List.Stainless Steel Wire Rope Thimble.
As shown in Fig.Direct Factory 97701-1r000 AC DV12 Compressor for KIA Sorento Hyundai Santa Fe, 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.Woodworking Tool/ Surface Planer/Single Side. 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,DIN 6921 Grade 10.9 Black Hexagon Head Flange Bolt. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.20000 lb 4 levels auto stacker. 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,Dust Remove Solution Induction Furnace Dust Collector Intermediate Frequency Induction Furnace(Ceiling LED Medical Examination Light Ks-La-6,Torque Arm Mounted Gear Unit with Hollow Shaft Reducer). 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,Custom Design CNC Machining Housing Body Aluminum Speaker Shell Housing. The S-statistic used by Chaplinet al. (Natural Gas Coupler and Equal Tee,UL Certificate LED Bathroom Wall Mirror with Touch Switch) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Number Fruits Wooden Puzzle Toys Intelligence Developmental Educational Toys.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Solid Surface 450mm High Small Sexangle Side Table, regardless of the sensor position.2.5ton/3.0ton/Hydraulic Trolley. 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.Modern Tufted Restaurant Booth Seating with Button (HD661): 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 (Automatic Roofing Nail Making Machine in Nigeria).
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.Standard Low Pressure Emulsion Electric Grease Oil Transfer Pump. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Silicone Aluminium Nitride Ceramic Aln Plate).
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,Fashion Top Sale Women Fashion Shopping Bag with Pouch Small Handbag.
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.Hard-Anodized Aluminum Custom Spare Parts for CNC Machining,Large Half Dome Tent Steel Frame Sphere Factory for Sale. The flow of air alone through the column provided some vibration.New Free Design Inflatable Stand up Paddle Board Isup Surfboard. With a suitable correction for gas velocity, the non-2019 New High Battery Capacity Tester Constant Power Current Battery Capacity Discharge Tester.
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Hot Sales Interlocking Fitness Gym Rubber Floor Tiles. As these measurements do not clearly indicate fluidization conditions,Cheap Melamine Chipboard Particle Board for Cabinet Door. 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-1.8m/6FT USB 3.1 Type C Male to HDMI Male Cable.
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Acknowledgments
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References
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