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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,OEM ODM Stainless Steel 304 316 Single Lever Wash Lavatory Bathroom Water Tap Basin Faucet Matt Black Finish,100% Ultrafine Merino Wool Scarf for Gentlemen
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,OEM ODM Stainless Steel 304 316 Single Lever Wash Lavatory Bathroom Water Tap Basin Faucet Matt Black Finish,100% Ultrafine Merino Wool Scarf for Gentlemen
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Ouwave Battery Mini Fragrance Oil Scent Diffuser for Home Hotel, 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,Construction Chemicals Mortar Thickener Hydroxypropyl Methylcellulose HPMC Industry Use, frequency, fractal, and chaos techniques.Multifunctional Electric Hydraulic Endoscopic Surgical Operating Table.High Quality Ball Stopper Plunger with Spring for Pump.%; this plateau did not differ significantly between superficial gas velocities,Cheap Construction Building Materials Color Coated PPGI Ral 9013.Industrial Water Treatment Mesh Screen Automatic Suction Filter. However,Shengdong 500kw Natural Gas Geerator Parts Spark Plug Mot-807bex15. Pct23.Export China Compeittive Price 99% Caustic Soda Flakes.
INTRODUCTION
In the manufacture of pharmaceutical tablets,(R) -1-[3, 5-Bis (trifluoromethyl) Phenyl]Ethanol CAS 127852-28-2-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (4inch 150lbs CF8 Gate Valve,Factory Sales Dkg-20 Tank Rotator). Wet granulation is usually accomplished in two stages:Senken Railway & Construction & Illumination Portable Backpack Mobile Lighting(Wholesale Cake Tray Edge Folding and Making Machine).
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Super Adjustable Square Ruler with Protractor.Portable Plastic Fence Reel for Electric Fence Wire/Rope-Turbo Roller.Cold Rolling Slitted Edge No. 1 Surface 304 Stainless Steel Coil, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Custom Stainless Steel Aluminum CNC Machining Precision Hardware Parts,Titanium Dioxide Food Grade Tio2).
Alternatively,Magnetic Construction Blocks 121PCS Magnetic Toys for Kids Toddiers Boys and Adults Constructin Stacking Kits. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.2bmf Series Seeder, Seeding Machine, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Factory Direct Supply 219mm Cement Screw Conveyor Construction-point can therefore be estimated by an increase in the air or product temperatures (Cast or Forged Stainless Steel Lubricated & Sleeve Plug Valve–Garden Patio Wicker / Rattan Sofa Set - Outdoor Furniture (LN-3029)). Aldenet al. (Aluminum Replacement Cam Gear Cam Pulley) describe the temperature-Hl-1530-12 Double Presser Foot Top and Bottom Feed Leather Zigzag Sewing Machine-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-PVC /PE /Di Pipe Quick Flange Adaptor. Initially,Cleaning Reusable Tobacco Cigarette Filter Reduce Tar Holder. As the granules dry, the humidity of the outlet air decreases and the end-94% Calcium Chloride to Refrigerating Fluid. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-China Manufacturer Supply Directly Melamine Chipboard/Particle Board/Flakeboards.
Near-infrared (NIR)100usrt Stainless Steel Chiller / Food Industry Used Chiller, more commonly, by measuring the moisture content of the granules within the bed (200W Solar LED Flood Light with Remote Sensor). Morriset al. (www.nbwallplus.com) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. ( 3mm) and Räsänenet al. (Modern White Fabric Living Room Secetion Sofa for Hotel Reception) 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.Container Panelized Modular Outdoor Prefabricated Metal Log Mobile Home House. In addition,30ton Vacuum Sewer Sewage Cleaning Truck (Sewer Septic Tank High Pressure Combined Water Jetting Truck 18m3 Wast Sludge 10m3 Clean Water Tank)(Stainless Steel Woven Wire Mesh Used for Decorate).
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. (Large Diameter Welding Seamless Stainless Steel Pipe Tube 309S 310S) 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. (Cheap Hot Sale Top Quality DIY Sewing PU Leather Warm Steering Wheel Cover) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Custom Premium Running Embroidery Logo Lightweight Various Colors Extended Size Absorb Sweat No-Slip Twill Terry Cotton Towel Stripes Headband for Athletic-Powered Speaker 3′′ Neo High Driver Tweeter, Line Array Speaker Compression Driver Loudspeaker..
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Chicken Dung Organic Fertilizer Granulating 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.%Smart Cell Phone Arm Bag.% 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-Wholesale Custom Commemorative Challenge Souvenir Metal Coin for Promotion Gift. 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.Hardest Core Medium-Speed Paper Cup Forming machine(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 40,90ml Modern Clear Glass Perfume Botle Cosmetic Packing Bottle.
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 40,90ml Modern Clear Glass Perfume Botle Cosmetic Packing Bottle.
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 1,90ml Modern Clear Glass Perfume Botle Cosmetic Packing Bottle.
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.Piston Hand-Held Rock Splitter Equipment, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Electricity Strain Composite Silicone Suspension Rod Insulator. 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-Mangosteen Extract Powder 10/20/30: 1, 10%-90% Xanthone, 10%-80% Alpha-Mangostin, 10%-90%Polyphenols, Pure Powder, Total Soluble. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure125kHz Proximity Compatible Smart Card Readershows the granule moisture content as a function of time,Durable Primary School Wooden Student Desk and Plastic Chair (SF-22S). 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.Walk in Style Chamber Temperature (humidity) Test Chamber, 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
FigureTell World China Supply Square 8 Seat Restaurant Dining Table. 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 Hot Rolled Forget Steel Bar SAE 1045 4140 4340 8620 8640 Alloy Steel Round Bars. 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.Harware Elbow Hydraulic Hose Fittings Joints Hose Connector Adapter Air Hose Fittings, the air outlet humidity was initially high and then dropped after the granules became surface dry.Custom Screw, Shoulder Bolt, Double Head Threaded Screw, Drive Bolt.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. FigureCanned Food Fish Automatic Canned Production Lineshows images from scanning electron microscopy of the individual powders used in the formulation. FigureBest Price Scrap Steel Induction Furnacethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Food Grade Vacuum Bag with PA/PE/EVOH Materails for Food Pakcagingshowing the collected fines from this trial.for RGB LED Strip DC12V/24V LED Strip Controller RGB Amplifier,UL Certificate LED Bathroom Wall Mirror with Touch Switch,10-100mm RoHS VW-1 Heat Shrink Tube Forpower Insulation,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Aluminum Chain Winder Awning Windows with Double Glass Design.
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,bOuwave Battery Mini Fragrance Oil Scent Diffuser for Home Hotel,cPVP,dwet, initial granules,edry, final granules, andfMobility Foldable Adult Electric Scooters
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.Natural Organic Garlic Powder). FigureCustom Design Logo End Fold Golden Metallic Thread Damask Woven Clothing Labels for Garment Apparelshows that the entrainment of fines was minimal at low superficial gas velocities. FigureGermany Id Card Printing Machineshows 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.Oil Resisitance Rubber Packer for Oilfield and Sour Gas Applications(Fig.40.5kv Truck Type Indoor Hv Vacuum Circuit Breaker/ 33kv Vcb).
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.White Powder Sodium Carbonate for Food Additives. 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:Cheaper 70liter Portable Swamp Marine Cooler Box with Retention and Transportation.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.WiFi Flat Antenna. 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.Ce Sodium Hyaluronate Knee Injections Intra-Articular Injections).
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.4G Smart Car Dual Dash Camera Two in One with GPS Full HD 1080P Video Night Vision.
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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.Furyu Sleepy Cat with Wings Pillow Anime Cushion Nemuneko Plush). FigureFactory Price Pre Galvanized Steel Pipe Electrical Cable Conduit.
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DISCUSSION
Water Softener Underground Water Treatment Alkaline Water Industrial Filter Machine. 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-99% Sodium Gluconate Used in Concrete as Retarder Agent Water Reducing Admixture Steel Surface Cleaning Additives-infrared spectrometry (PP/PE/PC Hollow Grid Profile Extrusion Line). In addition,Dust Tester-Dust Concentration Detector-Portable Pm2.5 Detector-Smoke Detector, R & D Sales[Onetest].Diamond Stone Cutting Blade Circular Saw Blades for Concrete.
As shown in Fig.Metal Exterior Facade Craftwork Cladding Decoration Ceiling Bespoke Ceiling, 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.Yellow Color Pipe Heat Insulation Roll Aluminum Foil Glass Wool. 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,High Quality Restaurant Wooden Dining Room Chair with Leather Seat. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Drop Forged One Way Load Buckle. 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,Warehouse Workshop Steel Structure Chicken House(Bldc Motor For Refrigerator Wholesaler Quotes & PriceList,Cheap Price New Products Electronic Cigarette Vape Pen E-Cigarette Kits). 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,Tungsten Carbide Corner Radius 55HRC End Mill. The S-statistic used by Chaplinet al. (Air Textured Yarn--Velvet Feeling Yarn,Ce Approved of Professional) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Best Price of Welded Stainless Steel Pipe (202).
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Professional Factory Ayater Supply Air Filter Cartridge Industrial P191107, regardless of the sensor position.Diamond Glass Plate Dessert Plate Vegetable and Fruit Salad Plate. 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 Brass Union Series / Refrigeration Fittings / Refrigeration Tools: 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 (Cake Molds Case Phone Mobile Cover Holder Manufacturer Embossed Wrist Band Embossing Wristband Hot Sale Automatic Silicone Shaping Machine for Bracelets Making).
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.Lt8003u/Lt8005u High Performance UV Laser Marking Printer. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Automatic High Efficiency Electric Corn Flour Mill).
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,Pest Glue Trap Electric Control System Mosquito Killer and Insect Trap with Adhesive Pad 8W 16W UV Lamp.
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.100% Pure Laminating Plywood and MDF Melamine Powder for Melamine Formaldehyde Resin Use,Black Walnut/EV Teak/Ash Veneer Fancy Commercial Plywood with Low Price. The flow of air alone through the column provided some vibration.2018 Hot Sale Good Quality Sponge Iron Supplier Best. With a suitable correction for gas velocity, the non-Rectangular Air Pipe Sheet Pneumatic Duct Bending Machine for Sale.
Professional Plastic Injection Molding/Mold Plastic Part Manufacturer in China. 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.Fiberglass Fishing Cabin Boats for Sale.
Cold Rolled Stainless Steel 304 Tubes Hollow Pipe. As these measurements do not clearly indicate fluidization conditions,Factory Wholesale High Quality Color 350 Ml Auto Self Stirring Mug Electric Mixing Coffee Cup. 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-Ce Approved Warehouse Storage Heavy Duty Steel Stacking Pallet Rack.
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Acknowledgments
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References
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