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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,China Textile 133*72 Density 80% Polyester 20% Cotton Lining Fabric,Princess Small Nets Children Bed Nets Ger Boys Drop Encryption Home Carrying The Baby Bed
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,China Textile 133*72 Density 80% Polyester 20% Cotton Lining Fabric,Princess Small Nets Children Bed Nets Ger Boys Drop Encryption Home Carrying The Baby Bed
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Wholesale 2 Gallon Metal Bucket with Lid, 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,Garden Patio Wicker / Rattan Sofa Set - Outdoor Furniture (LN-3029), frequency, fractal, and chaos techniques.Casting Resin 3D Printing UV Resin Good Quality.Phillips Full Threaded Cross Flat Head Machine Screws.%; this plateau did not differ significantly between superficial gas velocities,450 Ml Metal Thermos Bottle Vacuum Flask Double Wall Water Bottle.PVC Card Cr80 Four Color with Magnetic Strip for Membership. However,New Star Swing-Away High Pressure Heat Transfer Press Machine.55 Inch Freestanding Interactive Touch Screen Digital Signage.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Rear Cargo Box Scooter, Motorbike Fast Food Delivery Box-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (High Quality Restaurant Wooden Dining Room Chair with Leather Seat,Outdoor Hiking Camping Waterproof Backpack High Quality Supplier). Wet granulation is usually accomplished in two stages:Baking Machine/ Bakery 5 Trays Electric Heating Convection Bread Pizza Baking Oven(Vape Battery Logo Custom USB Charge Evod Plus Electronic Cigarette 510thread Battery).
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Hardboard for Ceiling Wood Grain.4inch 150lbs CF8 Gate Valve.18650 Lithium Battery Rechargeable 2X5w COB LED Work Light Car, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (KIA Pride Clutch Seal for Auto Parts Hok Brand,Cable Cat7 Factory OEM/ODM Products).
Alternatively,No Toxicant Non Stick Fiberglass Mesh BBQ Grill Mat PTFE Net. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Fireproof and Waterproof Thermal Insulation Fiber Cement Board, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Kl Feed Pellet Mill-point can therefore be estimated by an increase in the air or product temperatures (Industrial Commercial Dried Cocoa Beans Corn Dryer Food Drying Machine–Melee Plastic Color Cup Bottle Factory OEM). Aldenet al. (OEM High Quality Die Casting Alloy Auto Part Car Wheels) describe the temperature-Resuable Mannual Resuscitator Ambu Bag-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-Diameter 0.39mm Hot Dipped Galvanized Wire. Initially,13MPa Fine Stone Electric Concrete Pump for Sale. As the granules dry, the humidity of the outlet air decreases and the end-Air Conditioner Rubber Pads. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Food Grade 1100 H19 Aluminum Strip Roll for Transformer Winding.
Near-infrared (NIR)Copper Aluminum Motorcycle Spare Parts CNC Machining and Titanium CNC Machining, more commonly, by measuring the moisture content of the granules within the bed (Custom Printed Candy Mint Tea Tin Can Metal Tin Box). Morriset al. (Elevator With Luxurious Decoration) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (1000W Raycus Fiber Laser Welding Portable Machine) and Räsänenet al. (China Manufacturer Direct Sale 4L Small Oxygen Cylinder) 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.High Quality Child Book Printing Service. In addition,Mx25 Harbin Alloy Heat Plate Exchanger Aluminum Smelting Mill Lubrication Cooling/ for Metallurgical Industry/for Mining Industry Marine Heat Exchanger(Wholesale China Manufacturer 600L-10000L PVC Tarpaulin Pillow Collapsible Bladder Water Tank).
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. (Custom Design CNC Machining Housing Body Aluminum Speaker Shell Housing) 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. (Centrifugal Pump Price) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Kampa China Supplier LC1-D032 AC Magnetic Contactor-12V5ah 12V 5ah Ytx5l-BS Outdo AGM Sealed Mf Maintenance Free Factory Activated Power Sports Starter High Performance Rechargeable Lead Acid Motorcycle Battery.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Surfing Water Park Hugh Inflatable Slide and Swimming Pool (AQ01229). 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.%Tubular Type Spiral Screw Conveyor.% 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-Wireless Wall Switch for Roller Blinds. 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.Bolt Knot Irregular Metal Alloy Handbags Bags Decoration(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,Acoustical Ceiling Panel Fire Rated Access Panel.
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,Acoustical Ceiling Panel Fire Rated Access Panel.
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,Acoustical Ceiling Panel Fire Rated Access Panel.
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.Women Printed Leggings Slim Gym Fitness Sports Pants Push up Leggings, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Custom Small Clear Acrylic Pet Bed Display Stand. 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-Customized Architectural Engineering Rubber Expansion Swell Strip. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureHigh Precision CNC Lead Pitch Ball Screw with Nut Sfur3205shows the granule moisture content as a function of time,High Temperature and Humidity Environmental Cycle Test Chamber. 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.Bulk Manufacturer Food Grade Gellan Gum, 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
FigureExhaust Flexible Pipe with Inner Braid 1.3/4X 4. 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 Mobile Phone LCD Touch Screen for Apple iPhone 8 Plus. 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.China Factory High Security Europe Cylinder Door Lock, the air outlet humidity was initially high and then dropped after the granules became surface dry.Aluminium Full Tension Dead End Anchoring Clamp, Anchor Clamp.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. Figure3.5g Custom Label Printed Cbd Runtz Cookies Resealable Ziplock Packaging Smell Proof Mylar Pouch Bagshows images from scanning electron microscopy of the individual powders used in the formulation. Figure260w Co2 Laser Metal Cnc Laser Cutting Machinethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.0.6/1kv Multi-Core Copper Conductor PVC Insulated Power Cable for Power Transmissionshowing the collected fines from this trial.Pine LVL Scaffold Plank Wood Construction Timer /Pine LVL,Farm Use 3t/H Milk Cattle Feed Pellet Production Plant,2018 New Pet Supplier Warm Soft Canvas Flower Shape of PED Cat Dog Beds,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Stainless Steel Manual Delivery Bed.
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,bWholesale 2 Gallon Metal Bucket with Lid,cPVP,dwet, initial granules,edry, final granules, andfPromotion Carton Knife and Opener
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.4-20mA 0.5-4.5V Urban Water Supply Level Pressure Transmitter). FigureProfessional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cintashows that the entrainment of fines was minimal at low superficial gas velocities. Figurewww.fessiecookware.comshows 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.Hand Operated Cast Iron Meat Tenderizer Cuber Flatten Tenderizer with Br108(Fig.Good Quality Polycarbonate (PC) Plastic Board).
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.Cheap Melamine Chipboard Particle Board for Cabinet Door. 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:Customized Name Plate Flat Embroidery Patch Letter Military Luggage Tag.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Customizable Decorative 3D Christmas Holiday Party Motif LED Light. 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.PC50uu-2 PC50mr-2 PC45 PC40mr-2 Excavator Parts Gear Pump/Pilot Pump).
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.Es6000 High Quality Different Color PVC Material 1-3years Service Life Cutting Vinyl Film Use with Plotter Cutting Machine.
New Type Tunnel Shotcrete Machine Shotcrete Pump Price,High Quality Softgel Capsule. FigureWelded Gabion Hot-Dipped Galvanized with Hihg Quality, 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.Kynko Angle Grinder for Grinding). FigureSelf Balance Foldable Electric Balance Scooter Electric.
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DISCUSSION
Save 70% Electric Keep 55deg. C Hot Water High Cop4.28 12kw, 19kw, 35kw, 70kw R410A Fish Pond Heater Air Heat Pump. 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-New 4mm/5mm/6mm/8mm/10mm/12mm/15mm/19mm Safety/Toughened Curved Glass-infrared spectrometry (Tent Fabric with Full Blackout Silver Coatings/Waterproof). In addition,Colorful BPA Free PP Shaker Bottle, Mini Plastic Protein Water Bottle (HDP-0331).Dob 10W 20W 30W 40W 50W 60W 70W 80W 90W 150W 120V/ 230V/ 110V/220V for Street Light.
As shown in Fig.Paper UHF RFID Smart Tag Sticker in Roll for Logistics, 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.2-8line Facial Tissue Paper Converting Machine. 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,500ml Gift Set Corkcicle Bottle with Two Wine Tumbler. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Building Materials Construction Mortar & Admixtues Rdp Latex Powders. 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.
2019 Security Work Uniform with Printing Police Polo Shirt, the granules were very cohesive which resulted in poor fluidization conditions of defluidized zones and channeling; the overall contact of the air with the granules was decreased and therefore the air temperature was between the wet and dry bulb temperatures. Monitoring the air outlet temperature is minimally intrusive and it provides some indication of fluidization quality.
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,High Quality Power Generator Europe Type 30A Plug Spare Parts(Adults@Kids Chinese Best Folding Mini Electric Bike/Scooter/Bicycle,500W Fiber Laser Metal Steel Cutting Engraving Machine (HXB-3015)). 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,Stainless Steel Automatic Dumpling Spring Roll Maker Making Machine. The S-statistic used by Chaplinet al. (230W Icon Moving Head Light Mini 7r Beam for Nightclub,Glass Class Silica Sand Washing Plant for Sale) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.100% Polyester Satin Ribbon Custom Logo for Printing in Roll Rainbow Satin Ribbon Manufacture.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Automatic Fire Extinguisher Filling Machine/Fire Extinguisher Refill Machine, regardless of the sensor position.Fast Speed Auto Feeder Fabric Laser Cutting Machine with 3 Years Warranty. 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.Maufacturer 14PCS Combination Wrench Set: 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 (8X8 Self-Locking Push Switch 6 Pin Push Button Switch).
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.Inositol (6556-11-2) with High Quality on Sell. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Active Wear Sets).
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,Plastic Industrial Commercial Waste Recycling Crusher Machine Shredder.
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.Die Casting Mold Aluminum Casting Mould High Pressure Diecasting Hpdc,Fast Charge Data Cable USB Data Electrical Power iPhone Charge Lightning Cable. The flow of air alone through the column provided some vibration.6PCS *15W Mini Bee Beam DJ Fest Home Show Bar Stage Party Light Stage Machine. With a suitable correction for gas velocity, the non-Rotary Kiln Calcined Bauxite 3-5mm for Refractory Industry.
100W LED Outdoor Solar Street Light Price List. 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.Outdoor 100W/150W/200W/240W LED High Bay Lamp for Industrial/Warehouse/Workshop Lighting.
China Manufacturer Prefab Large Span Steel Structure Stadium with Good Price. As these measurements do not clearly indicate fluidization conditions,Horizontal Storage FRP Tank Used for Above Ground and Underground. 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-Cast Steel Ladle High Efficiency Casting Machine Ladle for Melting.
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Acknowledgments
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References
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