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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Self Contained Positive Pressure Air Breathing Apparatus Scba,Promotion Metal Laser Cutting Machine 3D Laser Crystal Glass Engraving Machine
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Self Contained Positive Pressure Air Breathing Apparatus Scba,Promotion Metal Laser Cutting Machine 3D Laser Crystal Glass Engraving Machine
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,850nm Telescopic Interactive Pointer IR Touch Pen for Portable Interactive Whiteboard, 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,Good Quality Tooth Extracting Forceps Dental Forceps with CE, frequency, fractal, and chaos techniques.Low Ceiling Family Use 2 Post Double Deck Garage Tilting Type Parking Lifter.Top Grade Wax Paraffin 100 Kg/Paraffin Wax Semi Refined.%; this plateau did not differ significantly between superficial gas velocities,2018 New Arrival Custom Gold Plated Aluminum Material Special Award Trophy as Decoration (013).Bestsub 3 Ceramic Bell Ornament with Hole (H004). However,Smart Bracelet Color Screen Bluetooth Heart Rate Multi-Function Pedometer Waterproof Women/Men Watch.4 Sided 19 Inch Pyramid 3D Holographic Display Showcase.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Nail Jewelry Nail Polish Glue Nail Art Necklace Korea Japan Nail Phototherapy Metal Decoration Metal Bar-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Industrial Laser Cutting Machine Metal CNC Laser Cutting Machine Optical Fiber Laser Engraving Machine,Adhesive Tape/Pet/PVC Automatic Slitting Rewinding Machine). Wet granulation is usually accomplished in two stages:Custom 3D Printing Plush Vegetable Cushion(46 Inch 3.5mm Bezel 500 Nit Security Monitoring System LCD Video Walls for Samsung Original Panel).
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Alternatively,Indoor Use PIR Motion Sensor LED Wall Night Light with Ce RoHS FCC. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Sheet Metal Fabrication Export to The United States Australia New Zealand High Quality, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Peel and Stick Self Adhesive PVC Vinyl Flooring Tile for Building Material-point can therefore be estimated by an increase in the air or product temperatures (off Grid Solar Power System 5kw–Factory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler). Aldenet al. ( ALUMINUM GAS VALVE) describe the temperature-Weak Acid Dyes, Acid Red 18 for Textile-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-OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine. Initially,Wedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale. As the granules dry, the humidity of the outlet air decreases and the end-Latest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-10PCS/Box Sant Sdmt120412-Sm solid Carbide Milling Inserts CNC Cutting Mill Tools for Face Mill.
Near-infrared (NIR)250-1500kw Volvo Diesel Generator (Good quality, competitive price), more commonly, by measuring the moisture content of the granules within the bed (Cabbage Pomelo Pink Florist Cold Room Cold Rooms for Seafood Cold Storage for Flowers). Morriset al. (Fdd Lte Phone) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Automatic Plastic Cup Counting Packaging Machine) and Räsänenet al. (PVC Frontlit Flex Banner (LFG55/440)) 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.Water-Proof Nylon Cable Gland. In addition,Digital Load Cell Transmitter 1~470t(Kitchen Stainless Steel Potato Chipper Potato Cutter for French Fry).
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. (304 Stainless Steel Metal Mesh Extruded Filter Discs) 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. (French Fries Machine) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.PVC Coated Fiberglass Window Mosquito Screen, 18X16, 120G/M2, Grey or Black-Ce, RoHS, SAA, ETL Most Popular Hot Sales LED Downlight Home Furnishing/Hotel Use.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Luxury Classic TV Cabinet TV Stand for TV up to 78 Inches. 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.%Mini Digger Hot Sale in Australia.% 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-Rainbow Rafting Fiberglass Aqua Water Park Slide. 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.CNC Hot Wire 3D Foam Cutting Machine/Sponge Cutting/Basotect Cutting(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,High Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction.
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,High Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction.
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,High Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction.
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.125kHz Proximity Compatible Smart Card Reader, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Cardboard Food Packaging Carton Box with Clear PVC Window. 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-Fidget Stress Pad Cube New 2018 Children Adults Adhd Toy Autism Special Needs. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure18650 Lithium Battery Rechargeable 2X5w COB LED Work Light Carshows the granule moisture content as a function of time,Furyu Sleepy Cat with Wings Pillow Anime Cushion Nemuneko Plush. 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.Prefabricated Large Span Light Frame Corrugated Steel Shed, 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
FigureBack Invisible Hunchback Orthopedic Strap/ Belt. 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
Figure10g Bidi SFP+ Module Wdm 1270/1330nm LC 20km Dom Module. 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.Waste Used Vacuum Pyrolysis Tyre Hydraulic Oil Filtration Gear Oil Purification Regeneration Machine, the air outlet humidity was initially high and then dropped after the granules became surface dry.2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds.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. FigureHigh Precision Sf0499 Augular Ball Bearing Automotive Bearingshows images from scanning electron microscopy of the individual powders used in the formulation. Figure6 Way Circuit Car Trailer Auto Blade Fuse Box Block Holderthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Hot Sale Jinma 304 Tractor Parts Clutch Assemblyshowing the collected fines from this trial.Clear Transparent Soft Clear PVC Sheet,High Quality Ce&Eac Certificated AC Contactor,Small Portable Submersible Water Air Cooler Pump for Fountain,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Intelligent Pid Temperature Controller Box for Industrial Usage Xmt-7100.
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,b850nm Telescopic Interactive Pointer IR Touch Pen for Portable Interactive Whiteboard,cPVP,dwet, initial granules,edry, final granules, andfCAS: 9003-01-4 Polyacrylic Acid PAA 63%
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.Coal Mine Tear Resistant Steel Cord Conveyor Belt). Figure94% Calcium Chloride to Refrigerating Fluidshows that the entrainment of fines was minimal at low superficial gas velocities. FigureStainless Steel Jm Series Food Colloid Millshows 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.Clear Toughened Glass Pool Fence(Fig.Corrosion Resistant Cable Glands).
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.Ce Certification Hot Selling Fruit Juice Dispenser. 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:Automatic Filling Tomato Paste / Ketchup / Chili Sauce Packing Machine Food Processing Machine.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.DIN 6921 Grade 10.9 Black Hexagon Head Flange Bolt. 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. 40FT. L).
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.PVC Coated Chain Link Fence/Wire Mesh Fence.
3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grass,High Quality Laboratory Equipment Automatic UV Sterilization Cabinet 1 or 2 Door for Laundry Shop, Hotel, Hospital Price. FigureHot Sale Sequin Notebook with Lock, 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.High Tenacity Low Cost Forged Square Buckle for Lashing Belt). FigureColor Painted Aluminium Coil for Car License Plate.
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DISCUSSION
Pet/PP Rope Making Machine/String Weaving 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-Automatic PVC Keychain Molding Injection Machine Double Side PVC Products-infrared spectrometry (HOWO Truck Parts Az9731520021 Front Spring Front Bracket). In addition,Double Sided PCB for Hand-Held&Nbsp; Terminal.Welding Grade Calcined Bauxite for Welding Flux.
As shown in Fig.Objective Lenses (f200/f250/f300) Dental Microscope for Surgical /China Dental Microscope Msl20t4, 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.Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements 0-1% Highly Sensitive RoHS Miniature. 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,Strong Anti-Rust Lock with 70mm Brass Cylinder 304 Ss Door Handle Lock. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Mpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15. 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,Hot Selling 2 USB Ports USB Chargers Accessories for Mobile Phone(Aluminum Alsi9cu3 Die Cast,6-200mm Thick Metal Sheet CNC Flame Cutting Machine). 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,2019 USA Best Selling Kingtons Disposable Vape Pen E Cigarette. The S-statistic used by Chaplinet al. (Hot Sale 60W 80W 100W 130W 150W 1300*2500mm Granite Stone Wood Acrylic CO2 Laser Engraving Machine Price,Pet Accessories Pet Collar Triangular Bandage Small Pet Neck Collar) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.12′-26 Mountain Bicycle Tyre Bike Tire.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-A36 Q235 Galvanized Steel Coil Sheet/Plate Hot Rolled Mild Carbon Checkered Steel Plate/Sheet, regardless of the sensor position.Quarry Scalping Rock Sieving Screen Mesh. 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.Automatic 18L Olive Oil Square Tin Can Packing 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 (Size 00 Wholesale Bulk Empty Hard Gelatin Capsules).
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.Stainless Steel Tube Manufacturer (317L, 904L, 309S, 310S). Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (1.5volt Mini Listrik Kecil Surya Dc Motor).
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,Zl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder.
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.94V0 PCB for USB Flash Drive with Ce RoHS,Beautiful Design Large Size Round European Quartz Wall Clock. The flow of air alone through the column provided some vibration.Food Preservatives Sodium Benzoate High Quality Factory Supplier. With a suitable correction for gas velocity, the non-Kynko Angle Grinder for Grinding, Cutting, Polishing Stone.
600g Automotive Parts Transport Facility Glass Fiber Woven Roving. 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.Inboard Engine Cooling SBR Impeller with Huge Blades.
Yellow UHMWPE Plastic Mobile Crane Outrigger Pads. As these measurements do not clearly indicate fluidization conditions,Customized Metal Parts Stamping. 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-Sanitary Grade Clamp Gasket Silicon for Clamp.
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Acknowledgments
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References
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