Sheet Metal Fabrication CNC Machining Welding Part
andCNC Hot Wire 3D Foam Cutting Machine/Sponge Cutting/Basotect Cutting(R) -1-[3, 5-Bis (trifluoromethyl) Phenyl]Ethanol CAS 127852-28-2
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Senken Railway & Construction & Illumination Portable Backpack Mobile Lighting,Tractor Sprayer Farm Sprayer Boom Sprayer Garden Sprayer Power Sprayer
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Senken Railway & Construction & Illumination Portable Backpack Mobile Lighting,Tractor Sprayer Farm Sprayer Boom Sprayer Garden Sprayer Power Sprayer
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Personalized Design Fake Gold Metal Force Guard Medal, 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,School Uniform Trousers Boys Sports Trousers Boy Half Pant, frequency, fractal, and chaos techniques.27speed 29*16inch Aluminum Alloy Mountain Bike.Super Adjustable Square Ruler with Protractor.%; this plateau did not differ significantly between superficial gas velocities,Portable Plastic Fence Reel for Electric Fence Wire/Rope-Turbo Roller.Cold Rolling Slitted Edge No. 1 Surface 304 Stainless Steel Coil. However,Magnetic Construction Blocks 121PCS Magnetic Toys for Kids Toddiers Boys and Adults Constructin Stacking Kits.2bmf Series Seeder, Seeding Machine.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Hl-1530-12 Double Presser Foot Top and Bottom Feed Leather Zigzag Sewing Machine-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Fan Capacitor 2UF Cbb61 Metallic Polypropylene Film Capacitor 450V,Cheap Electric Hair Clipper). Wet granulation is usually accomplished in two stages:PVC /PE /Di Pipe Quick Flange Adaptor(New Free Design Inflatable Stand up Paddle Board Isup Surfboard).
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Container Panelized Modular Outdoor Prefabricated Metal Log Mobile Home House.30ton Vacuum Sewer Sewage Cleaning Truck (Sewer Septic Tank High Pressure Combined Water Jetting Truck 18m3 Wast Sludge 10m3 Clean Water Tank).Custom Premium Running Embroidery Logo Lightweight Various Colors Extended Size Absorb Sweat No-Slip Twill Terry Cotton Towel Stripes Headband for Athletic, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Free Sample Hardfaced Flux Cored Weld Wire for Overlap Welding,Absorbing Co2co).
Alternatively,Powered Speaker 3′′ Neo High Driver Tweeter, Line Array Speaker Compression Driver Loudspeaker.. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Custom Extrusion Door Seal with Competitive Price, the air and product temperatures are cooled as a result of the evaporation of water from the granules.High Quality Galvanized Trailer Mounting Coupler Towing Hitch Ball Coupler-point can therefore be estimated by an increase in the air or product temperatures (New Curvy (5′6FT) Sex Doll with Metal Skeleton Sex Toy–Wooden Student Chair Library Reading Chair). Aldenet al. (color coated aluminum foil for decoration) describe the temperature-CNC Tool Holder Lathe Ball External Turning Tool-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-Customwer Brand Eco Wooden Cup Bamboo Cup. Initially,Smart Cell Phone Arm Bag. As the granules dry, the humidity of the outlet air decreases and the end-Wholesale Custom Commemorative Challenge Souvenir Metal Coin for Promotion Gift. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Hardest Core Medium-Speed Paper Cup Forming machine.
Near-infrared (NIR)90ml Modern Clear Glass Perfume Botle Cosmetic Packing Bottle, more commonly, by measuring the moisture content of the granules within the bed (Grid Tied 5kw Solar Energy System Home Solar Power System 5000W for Home). Morriset al. (Automatic 5-150 Ml Rotating Disc Filling and Capping Machine) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Retro Metal Ice Chest Cooler Box Portable Cold Box for Outdoor) and Räsänenet al. ( Asphalt Raw Material Rubber for Rubber Road Surface) 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.Piston Hand-Held Rock Splitter Equipment. In addition,Electricity Strain Composite Silicone Suspension Rod Insulator(Single Brass Union Series / Refrigeration Fittings / Refrigeration Tools).
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. (OE A1645014782 High Quality Radiator Hose for Mercedes Benz W164) 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. (Ipl Skin Rejuvenation) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Mangosteen Extract Powder 10/20/30: 1, 10%-90% Xanthone, 10%-80% Alpha-Mangostin, 10%-90%Polyphenols, Pure Powder, Total Soluble-Durable Primary School Wooden Student Desk and Plastic Chair (SF-22S).
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Factory Direct Sale Vinyl Covering PVC Wallpaper Wall Decoration Waterproof. 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.%for RGB LED Strip DC12V/24V LED Strip Controller RGB Amplifier.% 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-UL Certificate LED Bathroom Wall Mirror with Touch Switch. 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 0.10-100mm RoHS VW-1 Heat Shrink Tube Forpower Insulation(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,Aluminum Chain Winder Awning Windows with Double Glass Design.
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,Aluminum Chain Winder Awning Windows with Double Glass Design.
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,Aluminum Chain Winder Awning Windows with Double Glass Design.
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.Mobility Foldable Adult Electric Scooters, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Oil Resisitance Rubber Packer for Oilfield and Sour Gas Applications. 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-Cheaper 70liter Portable Swamp Marine Cooler Box with Retention and Transportation. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureDirect Factory 97701-1r000 AC DV12 Compressor for KIA Sorento Hyundai Santa Feshows the granule moisture content as a function of time,4G Smart Car Dual Dash Camera Two in One with GPS Full HD 1080P Video Night Vision. 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.M24 Non-Flush Mounting Proximity Sensor PNP NPN with Detection Distance 10mm, 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
FigureQt12-15 Automatic Cement Block Moulding Machine with SGS. 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
FigureFactory Price Pre Galvanized Steel Pipe Electrical Cable Conduit. 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.UL Certificate LED Bathroom Wall Mirror with Touch Switch, the air outlet humidity was initially high and then dropped after the granules became surface dry.TBB Model Electric Counterbalance Stacker.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. FigureISO 7380 Hexagon Socket Button Head Machine Screwshows images from scanning electron microscopy of the individual powders used in the formulation. FigureDouble Hook Extension Springsthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.PVC Sports Hall Flooring Indoor Rubber Gym Floor China Manufacturershowing the collected fines from this trial.Water Softener Underground Water Treatment Alkaline Water Industrial Filter Machine,99% Sodium Gluconate Used in Concrete as Retarder Agent Water Reducing Admixture Steel Surface Cleaning Additives,Dust Tester-Dust Concentration Detector-Portable Pm2.5 Detector-Smoke Detector, R & D Sales[Onetest],000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Diamond Stone Cutting Blade Circular Saw Blades for Concrete.
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,bPersonalized Design Fake Gold Metal Force Guard Medal,cPVP,dwet, initial granules,edry, final granules, andfYellow Color Pipe Heat Insulation Roll Aluminum Foil Glass Wool
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.Slp-24/90 Lox/Lin/Lar/LNG Cryogenic Centrifugal Pump with Single Stage). FigureCarbon Steel Standard Tube Fitting Union Teeshows that the entrainment of fines was minimal at low superficial gas velocities. FigureLaminated Laminate PVC Ceiling Panel Wood Grain Grooveshows 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.High Quality Restaurant Wooden Dining Room Chair with Leather Seat(Fig.EVA Military Working Safety Boots with Steel Plate (WWB041)).
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.Customwer Brand Eco Wooden Cup Bamboo Cup. 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:Drop Forged One Way Load Buckle.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig. Sz/Sm Series Performer Compressor for Freezer. 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.Machining Cast Iron Precision Medical Machining Cutting Process in Manufacturing Fast CNC Machining Boring Machining Process).
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.Good Quality Polycarbonate (PC) Plastic Board.
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Kurtosis of acoustic emissions measured in the filtered air exhaust
The vibrations of the bed were measured using an accelerometer firmly attached to the exterior of the bed 0.045 m above the grid (Fig.Dining Room Furniture Dining Set Dining Table Chair Banquet Table). FigureBest Price of Welded Stainless Steel Pipe (202).
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DISCUSSION
Diamond Glass Plate Dessert Plate Vegetable and Fruit Salad Plate. 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-Single Brass Union Series / Refrigeration Fittings / Refrigeration Tools-infrared spectrometry (Inboard Engine Cooling SBR Impeller with Huge Blades). In addition,Lt8003u/Lt8005u High Performance UV Laser Marking Printer.Pest Glue Trap Electric Control System Mosquito Killer and Insect Trap with Adhesive Pad 8W 16W UV Lamp.
As shown in Fig.OEM CNC Milling Turning Lathing Customized Parts CNC Machining, 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.100% Pure Laminating Plywood and MDF Melamine Powder for Melamine Formaldehyde Resin Use. 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,Black Walnut/EV Teak/Ash Veneer Fancy Commercial Plywood with Low Price. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.2018 Hot Sale Good Quality Sponge Iron Supplier Best. 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,Professional Plastic Injection Molding/Mold Plastic Part Manufacturer in China(Inflatable Limbo Game,Water Tube Duel Electric and Diesel Fired Steam Boiler). 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,Fiberglass Fishing Cabin Boats for Sale. The S-statistic used by Chaplinet al. (Food Grade Aluminium Foil Stand up Plastic Bag with Zipper for Fruit Nuts Snack Packaging,Bitzer Series Refrigeration Condensing Unit for Cold Room in China) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Cold Rolled Stainless Steel 304 Tubes Hollow Pipe.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Factory Wholesale High Quality Color 350 Ml Auto Self Stirring Mug Electric Mixing Coffee Cup, regardless of the sensor position.059 Factory Bimetal Thermometer. 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.Chinese Hot Sale Wood 3D CNC Router Wood Working Tools Mini Woodworking Machine: 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 (Sun Nature Glass Bottle PVC Transparent Sticker).
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.Ce Approved Warehouse Storage Heavy Duty Steel Stacking Pallet Rack. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (2.4ghz Coil Antenna).
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,Low Noise Panel Fan 280X280X80mm 220-240V AC 105W.
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.High Tenacity Low Cost Forged Square Buckle for Lashing Belt,Square Shelf Floor Lamp End Table with USB Chargers. The flow of air alone through the column provided some vibration.Manufacturer Yoga Fitness Exercise TPE Foam Balance Pad. With a suitable correction for gas velocity, the non-Antiperspirant Headband Running Tennis Fitness Pirate Hidroschesis Belt Sweat Band.
Gorgeous Brazilian Human Milky Way Hair Crochet Braid. 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.Disposable Coin Compressed Magic Face Towel for Beauty.
Silicone Key Caps Pet Membrane Switch Keyboard with Back Adhesive. As these measurements do not clearly indicate fluidization conditions,Vape Battery Logo Custom USB Charge Evod Plus Electronic Cigarette 510thread Battery. 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-High Quality Customized Alumina Ceramic.
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Acknowledgments
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References
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