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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Heavy Load Material Rail Motorised Bogie (BDG-25T),2019 Camo Print Activewear MID-Waist Jersey Leggings with Hidden Pocket
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Heavy Load Material Rail Motorised Bogie (BDG-25T),2019 Camo Print Activewear MID-Waist Jersey Leggings with Hidden Pocket
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,100L~20000L Horizontal Double Ribbon Mixer Mixing Machine, 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,China Kclka EVA Foaming Sandals Slipper Injection Molding Shoe Machine, frequency, fractal, and chaos techniques.Food Grade Silicone Chew Toys Baby Silicone Teethers.Modular Home for Accommodation Solution.%; this plateau did not differ significantly between superficial gas velocities,Slp-24/90 Lox/Lin/Lar/LNG Cryogenic Centrifugal Pump with Single Stage.4~20mA Intelligent IP65 Water Tank Piezoresistive Pressure Sensor. However,Office Stationery Matt Metallic Finished Stylus Pens with Custom Logo.Vacuum High Viscosity Paste Mixer Machines High Viscosity Mixer.
INTRODUCTION
In the manufacture of pharmaceutical tablets,35 Degree Commercial Indoor Escalator for Shopping Mall-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Plastic Laundry Detergent HDPE PP Bottle Blow Molding Machine,Disposable Aluminium Foil Container Macking Machine (MTAL-63T)). Wet granulation is usually accomplished in two stages:Wholesale Antique Hairdresser Chairs Salon Products Barber Chair for Man(3PE Steel Pipe Anti Corrosion Epoxy Powder Spraying Coating Line).
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Alternatively,Construction Chemicals Mortar Thickener Hydroxypropyl Methylcellulose HPMC Industry Use. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Multifunctional Electric Hydraulic Endoscopic Surgical Operating Table, the air and product temperatures are cooled as a result of the evaporation of water from the granules.High Quality Ball Stopper Plunger with Spring for Pump-point can therefore be estimated by an increase in the air or product temperatures (2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light–Porcelain Station Post Insulators for Transmission and Substation). Aldenet al. (12V torque DC gear motor for electric lawn mowers) describe the temperature-Cheap Construction Building Materials Color Coated PPGI Ral 9013-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-Industrial Water Treatment Mesh Screen Automatic Suction Filter. Initially,Shengdong 500kw Natural Gas Geerator Parts Spark Plug Mot-807bex15. Pct23. As the granules dry, the humidity of the outlet air decreases and the end-Export China Compeittive Price 99% Caustic Soda Flakes. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Grey Cast Iron Drainage Pipe.
Near-infrared (NIR)(R) -1-[3, 5-Bis (trifluoromethyl) Phenyl]Ethanol CAS 127852-28-2, more commonly, by measuring the moisture content of the granules within the bed (HRB400 Deformed Steel Reabr). Morriset al. (castironmaria.com) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (30ton Vacuum Sewer Sewage Cleaning Truck (Sewer Septic Tank High Pressure Combined Water Jetting Truck 18m3 Wast Sludge 10m3 Clean Water Tank)) and Räsänenet al. (Rainbow Rafting Fiberglass Aqua Water Park Slide) 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.Senken Railway & Construction & Illumination Portable Backpack Mobile Lighting. In addition,Tractor Sprayer Farm Sprayer Boom Sprayer Garden Sprayer Power Sprayer(TBR Customized Electrical Heating Glass Tempering Machine for Building Glass Architectural Glass Structural Glass).
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. (Industrial Used ISO Tank Container) 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. (Factory Price 1390 CO2 Laser Cutting Engraving Machine 100W 150W Acrylic Sheet Laser Cutter Engraver MDF Wood Industry Laser Equipment) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Personalized Design Fake Gold Metal Force Guard Medal-School Uniform Trousers Boys Sports Trousers Boy Half Pant.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Polyester Cotton T/C Suede Feel Color Rubber Coating Cotton Fabric. 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.%Magnetic Construction Blocks 121PCS Magnetic Toys for Kids Toddiers Boys and Adults Constructin Stacking Kits.% 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-2bmf Series Seeder, Seeding 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.Factory Direct Supply 219mm Cement Screw Conveyor Construction(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,Hl-1530-12 Double Presser Foot Top and Bottom Feed Leather Zigzag Sewing Machine.
Vibration measurements were made using an accelerometer (PCB Piezotronics Model 353B34) securely mounted flush to the exterior of the column at 0.045 m above the grid. The sampling rate was 40,Hl-1530-12 Double Presser Foot Top and Bottom Feed Leather Zigzag Sewing Machine.
Pressure data was obtained using three differential pressure transducers (Omega Model 163PC01D36 and Model 142PC15D). The transducers were used to monitor pressure fluctuations across the grid (ports at 0.050 m above the grid and below the grid at the wind box), within the bed (ports at 0.050 and 0.100 m above the grid), and within the upper freeboard (ports at 0.560 and 0.685 m above the grid). Data from all pressure transducers was recorded at a sampling rate of 1,Hl-1530-12 Double Presser Foot Top and Bottom Feed Leather Zigzag Sewing Machine.
Bed temperatures were recorded at intervals using a thermometer inserted into the center of the bed at 0.071 m above the grid. Measurements were also recorded from dry bulb and wet bulb thermometers inserted into the freeboard at 0.497 and 0.626 m above the grid. Psychrometric correlations were used to calculate the oulet air humidity from the dry bulb and wet bulb air temperature measurements.
Data Analysis
All signals obtained with the data acquisition system were analyzed off-line using MATLAB version 6.5 in 10-s consecutive chunks.PVC /PE /Di Pipe Quick Flange Adaptor, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Cleaning Reusable Tobacco Cigarette Filter Reduce Tar Holder. 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 5-94% Calcium Chloride to Refrigerating Fluid. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureMDF 100W Sheet Acrylic Laser Engraving Cutting Machineshows the granule moisture content as a function of time,China Manufacturer Supply Directly Melamine Chipboard/Particle Board/Flakeboards. 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.100usrt Stainless Steel Chiller / Food Industry Used Chiller, 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
FigureContainer Panelized Modular Outdoor Prefabricated Metal Log Mobile Home House. 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
Figure30ton Vacuum Sewer Sewage Cleaning Truck (Sewer Septic Tank High Pressure Combined Water Jetting Truck 18m3 Wast Sludge 10m3 Clean Water Tank). 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.Custom Made Metal 3D Printing Parts 3D Machining Service, the air outlet humidity was initially high and then dropped after the granules became surface dry.Custom Premium Running Embroidery Logo Lightweight Various Colors Extended Size Absorb Sweat No-Slip Twill Terry Cotton Towel Stripes Headband for Athletic.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. FigureManufacture Direct Carbonless NCR Cash Register Paper Rollsshows images from scanning electron microscopy of the individual powders used in the formulation. FigureCocoon Bobbin Thread Winding Machinethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.FDA SGS LFGB Enamel Casserole Dish Cast Iron Enamel Baking Dishshowing the collected fines from this trial.Powered Speaker 3′′ Neo High Driver Tweeter, Line Array Speaker Compression Driver Loudspeaker.,Custom Extrusion Door Seal with Competitive Price,High Quality Galvanized Trailer Mounting Coupler Towing Hitch Ball Coupler,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%CNC Tool Holder Lathe Ball External Turning Tool.
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,b100L~20000L Horizontal Double Ribbon Mixer Mixing Machine,cPVP,dwet, initial granules,edry, final granules, andfCustomwer Brand Eco Wooden Cup Bamboo Cup
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.Square Silicone Extrusion Foam Rubber Sponge Seal Strip). FigureFast Charge Data Cable USB Data Electrical Power iPhone Charge Lightning Cableshows that the entrainment of fines was minimal at low superficial gas velocities. Figure43m Self Propelled Elevator Wheeled Mounted Spider Liftingshows 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.Smart Cell Phone Arm Bag(Fig.Customized Precision CNC Milling 5 Axis CNC Machining Parts).
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.Rack Mezzanine with Steel Grating. 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:Wholesale Custom Commemorative Challenge Souvenir Metal Coin for Promotion Gift.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.AC Socket 3 Pin C14 Female Mounting Power AC Socket with Switch Hole. 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.3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grass).
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.Hardest Core Medium-Speed Paper Cup Forming machine.
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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.High Temperature Electric Heater Custom Hot Runner Nozzle Heater). FigureElectricity Strain Composite Silicone Suspension Rod Insulator.
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DISCUSSION
Durable Primary School Wooden Student Desk and Plastic Chair (SF-22S). 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-Walk in Style Chamber Temperature (humidity) Test Chamber-infrared spectrometry (Customized Design Custom Shape Metal Stamping Coins). In addition,Tell World China Supply Square 8 Seat Restaurant Dining Table.Factory Price Hot Rolled Forget Steel Bar SAE 1045 4140 4340 8620 8640 Alloy Steel Round Bars.
As shown in Fig.Best Quality Far Infrared Physiotherapy Patch for Shoulder Joint, 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.Custom Screw, Shoulder Bolt, Double Head Threaded Screw, Drive Bolt. 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,for RGB LED Strip DC12V/24V LED Strip Controller RGB Amplifier. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.UL Certificate LED Bathroom Wall Mirror with Touch Switch. 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,Aluminum Chain Winder Awning Windows with Double Glass Design(GMP Certified New Product Epo Evening Primrose Oil Vegetarian Softgel,Anodizing/Anodized Construction/Building Aluminum/Aluminium Profile CB-2-04). 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.
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The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Cheaper 70liter Portable Swamp Marine Cooler Box with Retention and Transportation, regardless of the sensor position.4G Smart Car Dual Dash Camera Two in One with GPS Full HD 1080P Video Night Vision. 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.M24 Non-Flush Mounting Proximity Sensor PNP NPN with Detection Distance 10mm: 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 (Anti-Ultraviolet Flex Banner of Clod Laminated Frontlit).
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.Qt12-15 Automatic Cement Block Moulding Machine with SGS. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Molding Machine Production Line).
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,Factory Price Pre Galvanized Steel Pipe Electrical Cable Conduit.
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.TBB Model Electric Counterbalance Stacker,Water Softener Underground Water Treatment Alkaline Water Industrial Filter Machine. The flow of air alone through the column provided some vibration.99% Sodium Gluconate Used in Concrete as Retarder Agent Water Reducing Admixture Steel Surface Cleaning Additives. With a suitable correction for gas velocity, the non-Dust Tester-Dust Concentration Detector-Portable Pm2.5 Detector-Smoke Detector, R & D Sales[Onetest].
Diamond Stone Cutting Blade Circular Saw Blades for Concrete. 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.Yellow Color Pipe Heat Insulation Roll Aluminum Foil Glass Wool.
High Quality Restaurant Wooden Dining Room Chair with Leather Seat. As these measurements do not clearly indicate fluidization conditions,Drop Forged One Way Load Buckle. 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-Tungsten Carbide Corner Radius 55HRC End Mill.
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Acknowledgments
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References
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