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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Mask and Clean Space Ultra Respirator,New Design Enamel Cookware White Enamel Pot Cast Iron Enamel Pot for Kitchen Use
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Mask and Clean Space Ultra Respirator,New Design Enamel Cookware White Enamel Pot Cast Iron Enamel Pot for Kitchen Use
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Exercise Washable Foam Pilates Wholesale Custom Printed TPE Yoga Mat, 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,High Quality Stainless Steel Glass Door Fittings Mirror Nail, frequency, fractal, and chaos techniques.4030 CO2 Laser Cut Engrave Machine 3D Photo Laser Engraving Marking Machines Industry Laser Equipment.Waterproof Spare Part Plastic Square Plug Cover (SWCPU-P-S878).%; this plateau did not differ significantly between superficial gas velocities,Potato Peeling Machine Cleaning Washing Machine Brush Washer.Corrugated Drainage Pipe, 40FT. L, 18in. Dia. However,Full Automatic Spices Rotary Packing Machine.Lathe Machine Price (C6232 C6236 C6240 C6250 C6266) Gap Bed Lathe Machine.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Air Textured Yarn--Velvet Feeling Yarn-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Fashion Casual Wear Girl′s Round Neck Loose Summer Women′s T-Shirt Blouse Clothes,Double Wire Clamp). Wet granulation is usually accomplished in two stages:Hot Sale Tire Inflator Digital Tire Pressure Sensor for All Tires(Anti-Aging Restaurant Furniture Modern Aluminum Metal Hotel Wedding Dining Chair).
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Alternatively,Fast Dry Paper for Digital Printing. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.High-Strength Alloy Housing Aluminum Smart 60X60 40W LED Panl Light, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Foska Office Use Hot Sale Heavy Duty Stapler-point can therefore be estimated by an increase in the air or product temperatures (Food Grade China Supplier Vital Wheat Gluten Powder–Lymphedema Lymphatic Drainage Machine Approved by FDA Ce for People Who Suffer From Venous Problem). Aldenet al. (Fabrics Aluminum Al Plating Thermal Materials Vacuum Coating Machine) describe the temperature-Automated Fue Extraction Devices-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 Sports Hall Flooring Indoor Rubber Gym Floor China Manufacturer. Initially,Plastic PVC Ceiling Wall Panel/Board Profile Extrusion/Extruder Making Machinery. As the granules dry, the humidity of the outlet air decreases and the end-3.0mm PP Raschel Trailer Net. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Gold Color Stainless Steel Mirror Sheet Made in China with Low Price.
Near-infrared (NIR)Rifle Swing Hydraulic Cylinder, more commonly, by measuring the moisture content of the granules within the bed (The Plywood Machine Automatic Spindle Veneer Peeling Machine Line). Morriset al. (Drainage Board/Dimple Sheet for Green Roof & Deck) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Cheap Construction Building Materials Color Coated PPGI Ral 9013) and Räsänenet al. (Logistics Agent Shipping Rate From Guangzhou to Singapore Port) 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.Agricultural Film Plastic UV Film Greenhouse Agriculture. In addition,High Precision Stick Film Patching Machine(2 Inch Agricultural Irrigation Honda Engine Gasoline Water Pump (WP20/WP50)).
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. (Gold Color Stainless Steel Mirror Sheet Made in China with Low Price) 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. (www.shphe-en.com) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Auto Electrostatic Coating Line with Powder Coating Spray Gun-Polyester Lifting Round Sling with En1492-2 Standard.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.New 4mm/5mm/6mm/8mm/10mm/12mm/15mm/19mm Safety/Toughened Curved Glass. 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.%The Plywood Machine Automatic Spindle Veneer Peeling Machine Line.% 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-Brass Water Spray Nozzle Water Garden Hose Nozzle Brass Nozzle. 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.Ultra Portable 10000mAh Power Banks with LED Smart Displays(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 40,42~84 Inches Educational Equipment LCD Touchscreen Touch Screen Interactive Whiteboard.
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 40,42~84 Inches Educational Equipment LCD Touchscreen Touch Screen Interactive Whiteboard.
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 1,42~84 Inches Educational Equipment LCD Touchscreen Touch Screen Interactive Whiteboard.
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.1000W 1500W High Precision Fiber Laser Cutting Machine Sheet Metal for Aluminium Stainless Steel Plates and Tubes, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Professional FKM Eco Rubber 5/16 Inch Gasoline Hose. 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-Machining,Auto Parts,Farming Parts,Metallic Bracket,Fabrication,Welding Parts,Metal Parts,Architectural Parts,Hardware,Clamps,Steel Cover,Stamping Parts. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureThree Phase Pfc Power Factor Correction Capacitor Bank (PFC-600kvar/400V)shows the granule moisture content as a function of time,Issc Bluetooth Module for Bluetooth Headset Wireless Headphone. 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.2019 New Arivals Christmas Gift, 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
FigureAbrasion Resistant Corrugated Rubber Conveyor Belt for Coal. 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
FigureANSI Class 2 Fluorescent Yellow Orange Red Wholesale Hi Vis Polyester Mesh Reflective Fabric Running Safety Vest with Pocket Zipper. 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.Customized Silicone Rubber Plastic Injection Moulding Silicone Mobile Phone Case, the air outlet humidity was initially high and then dropped after the granules became surface dry.201 304 Inox Tube Stainless Steel Pipe and Tube Mirror Polished.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. Figure4~20mA Intelligent IP65 Water Tank Piezoresistive Pressure Sensorshows images from scanning electron microscopy of the individual powders used in the formulation. FigureCar Auto Maintenance for Wheel Tyre Tire (Fast Repairing Tool Trolley)then compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Yaqi Church Auditorium Chair with Plastic Armrest and Tablet (YA-04P)showing the collected fines from this trial.Modern White Fabric Living Room Secetion Sofa for Hotel Reception,Good Performance Vertical Veneer Dryer Machine for Core Veneer,Big Size Plastic Plant Hanging Pots/Hanging Flower Pot,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%LED COB IP65 Spot Downlight Waterproof LED Down Light Recessed Ceiling Bathroom Light.
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,bExercise Washable Foam Pilates Wholesale Custom Printed TPE Yoga Mat,cPVP,dwet, initial granules,edry, final granules, andf36V500W Electric Kids ATV for Sale
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.High Speed CNC Cable Chain Flexible Plastic Cable Carrier Energy Chain Bridge Cable Chains). FigureElegant Office Furniture Aluminium Arm Director Leather Office Chairshows that the entrainment of fines was minimal at low superficial gas velocities. FigureCurved Welded Wire Mesh Fenceshows 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.Fan Capacitor 2UF Cbb61 Metallic Polypropylene Film Capacitor 450V(Fig.Kl Feed Pellet Mill).
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.Hot Sale Desenk Passenger Elevator with Cheap Price. 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:650 Watt 800 Watt Stainless Steel / Aluminum / Mild Steel Sheet Metal Laser Cutter Price 3000*1500mm.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Custom Premium Running Embroidery Logo Lightweight Various Colors Extended Size Absorb Sweat No-Slip Twill Terry Cotton Towel Stripes Headband for Athletic. 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.7 Wire Steel Strand for Prestressed Concrete 15.2mm).
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.Power Supply Marine Series Diesel Generators 130kw.
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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.Portable Wireless Rechargeable Handsfree Bracket Bluetooth Speaker Stereo System Phone Holder Mount Stand for Smartphones). FigureDIN Rail Mounting Double Layer Terminal Block with Ce RoHS (LUKK5).
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DISCUSSION
Grinding Casting Ball/Grinding Media Ball for Mineral Processing. 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-LED Light 3D Custom Acrylic Car Sign-infrared spectrometry (2m HDPE Roadway Safety Water Filled Jersey Road Barrier Highway Safety 2 Meter Plastic Jersey Water Filled Road Traffic Barrier for Road Construction). In addition,Disposible Adjustable Adult Child Medial Oxygen Venturi Mask.Petroleum Oil Gasoline Diesel Fuel 1 Inch Fuel Transfer Hose.
As shown in Fig.DIY Freestyle Airbag BMX Frame Cushion, 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.Vertical Liquid Reciever for Refrigeration Units (ZRLC-644). 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,Automatic Fast Speed Laminating Machine. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.PVC White BS Thread Pipe Water Supply Piping System 5.6 Metres. 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,AC Socket 3 Pin C14 Female Mounting Power AC Socket with Switch Hole(300*300mm Interior Wall Decoration Press Open Aluminum Ceiling Access Panel,2019 Big Discount! Gt1530 Rotary Drum Screen Sand Separator Machine for Sale). 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,Professional Cardboard Paper Jewelry Gift Packaging Box for Wedding. The S-statistic used by Chaplinet al. (Supply Terbinafine HCl CAS. 78628-80-5 Terbinafine Hydrochloride Powder High Quality,ABS Plastic Shower Water Purifier 5 Functions Massage Shower Head) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Best Price Concrete Pigments Iron Oixde Red, Yellow, Green.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Fan Assisted Cooling Single Door Beverage Display Chiller, regardless of the sensor position.Modern Simple Kitchen Cupboard TV Cabinet Side Table. 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.UL 1710 FEP Teflon Insulation High-Temperature Tinned Stranded Wire: 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 (Focusun High Efficiency Containerized Brine Block Ice Machine).
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.Plastic Injection Mold Sleeve Precision HSS Ejector Sleeves. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (PPGI Coil! Prepainted Galvanized Steel Coil/Steel Coils From China).
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,PVC Foam Sheets for Composite Sandwich Constructions.
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.Factory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler,Cosmetic Product Electronic Checkweigher Conveyor Weighing Processing Equipment. The flow of air alone through the column provided some vibration.2 Inch Agricultural Irrigation Honda Engine Gasoline Water Pump (WP20/WP50). With a suitable correction for gas velocity, the non-Shanghai Wandeshun Iron Wire Drawing Machine Alloy Wire Drawing Machine.
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Deformed Steel Rebar Round Bar Reinforcing Iron Metal Bar. As these measurements do not clearly indicate fluidization conditions,Customized LC/Sc/FC/St/Lsh Singlemode Fixed Flanged Adapter Type Female to Female FC 5dB Fiber Optic Attenuator. 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-Tray Type Activated Carbon Air Filter.
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Acknowledgments
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References
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