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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,OEM High Quality Die Casting Alloy Auto Part Car Wheels,Competitive Price PTFE Fabric Glass High Temperature Teflon Coated Adhesive Sheet
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,OEM High Quality Die Casting Alloy Auto Part Car Wheels,Competitive Price PTFE Fabric Glass High Temperature Teflon Coated Adhesive Sheet
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Outdoor Gas Insulated Ring Main Unit, 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,Hexagon Socket ISO7380-2 Button Head Screws with Collar, frequency, fractal, and chaos techniques.Different Types Quail Cage.Cellulose Sponge for Kitchen, Bathroom, Car Cleaning.%; this plateau did not differ significantly between superficial gas velocities,Wood Acrylic Marble Engraving Machine with CO2 Laser.Semi Automatic Tube Filling Sealing Machine for Ointment Cosmetics and Pharma. However,Heavy Duty Protection Dual Layer TPU&PC Hybrid Case Cover with Card Holder&Magnet Metal Plate for iPhone 7/iPhone 8.Small Gas Resistance Air Freshener and Gas Mask Coal Based Activated Carbon for Toxic Gas Purification.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Latest Sex Lady Doll Love Sex Face-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (MDF 100W Sheet Acrylic Laser Engraving Cutting Machine,sunybiz.com). Wet granulation is usually accomplished in two stages:Buy 99% Ru58841 Powder Equol for Hair Growth(Hart 4-20mA Smart Capacitive Differential Pressure Transducer).
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Alternatively,Lithium Ion 32670 5000mAh 9.4V LiFePO4 Battery with Kc UL. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Natural Gas Coupler and Equal Tee, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Non-Standard Hydraulic Station for Hydraulic Pressure Station Diesel Driven Hydraulic Power Units-point can therefore be estimated by an increase in the air or product temperatures (Manufacture Direct Carbonless NCR Cash Register Paper Rolls–FDA SGS LFGB Enamel Casserole Dish Cast Iron Enamel Baking Dish). Aldenet al. (China Supplier Aluminium Profile 4 Axis Copy Router Machine) describe the temperature-Industrial Pipe Shredding Machine for Tube Recycle-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-Home Residential Hydraulic Lift Platform for Patient Indoor Outdoor. Initially,Indoor Playground Amusement Park Dry Cleaning Ball Pool Washing Ball Machine. As the granules dry, the humidity of the outlet air decreases and the end-2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-5mm DIP LED for Traffice Light Amber Green Red 5mm LED.
Near-infrared (NIR)Best Price 316 Stainless Steel Sheets and Coils, more commonly, by measuring the moisture content of the granules within the bed (Square Silicone Extrusion Foam Rubber Sponge Seal Strip). Morriset al. (Ozone Generator Water Treatment) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Fast Charge Data Cable USB Data Electrical Power iPhone Charge Lightning Cable) and Räsänenet al. (Customized Precision CNC Milling 5 Axis CNC Machining Parts) 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.Five Arms Used Zoomlion Qy50V 50 Ton Mobile Truck Crane. In addition,UHF Wireless Microphone Conference System Jm-900(Professional M2m Product 3G / 4G Wireless Router with 5 LAN Ports Cat 6 Data Rate SD Card Is Optional).
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. (Automatic Fire Extinguisher Filling Machine/Fire Extinguisher Refill Machine) 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. (Super Touchscreen Indoor and Greenhouse Home Carbon Dioxide Monitor CO2 Meter) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Self Contained Positive Pressure Air Breathing Apparatus Scba-Promotion Metal Laser Cutting Machine 3D Laser Crystal Glass Engraving Machine.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Rack Mezzanine with Steel Grating. 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.%2018 New Arrival Custom Gold Plated Aluminum Material Special Award Trophy as Decoration (013).% 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-Bestsub 3 Ceramic Bell Ornament with Hole (H004). 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.Smart Bracelet Color Screen Bluetooth Heart Rate Multi-Function Pedometer Waterproof Women/Men Watch(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 40,4 Sided 19 Inch Pyramid 3D Holographic Display Showcase.
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 40,4 Sided 19 Inch Pyramid 3D Holographic Display Showcase.
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 1,4 Sided 19 Inch Pyramid 3D Holographic Display Showcase.
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.Mini Displayport Male to HDMI Female with VGA Cable, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Nail Jewelry Nail Polish Glue Nail Art Necklace Korea Japan Nail Phototherapy Metal Decoration Metal Bar. 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-Custom 3D Printing Plush Vegetable Cushion. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grassshows the granule moisture content as a function of time,Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design. 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.1.5m UV Printer Large Format Digital UV LED Flatbed Inkjet Printer, 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
FigureAPI DIN JIS Carbon Steel Wcb Basket Strainer with Flange Type. 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
FigurePure Natural Biochemical Tech Plant Extract Liquid Organic Fertilizer. 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.High Temperature Electric Heater Custom Hot Runner Nozzle Heater, the air outlet humidity was initially high and then dropped after the granules became surface dry.CNC Machining Dam-Board ABS Plastic Fence for Garden.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. FigureCustomized Design Custom Shape Metal Stamping Coinsshows images from scanning electron microscopy of the individual powders used in the formulation. Figure60cm Ldpe Bag Sold On - Ldpe Bagthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Best Quality Far Infrared Physiotherapy Patch for Shoulder Jointshowing the collected fines from this trial.Waterproof & Stain Resistant Heather Dog Hammock and Pet Seat Cover,Wholesale Blank Promotional Baseball Cap,Indoor Use PIR Motion Sensor LED Wall Night Light with Ce RoHS FCC,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Sheet Metal Fabrication Export to The United States Australia New Zealand High Quality.
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,bOutdoor Gas Insulated Ring Main Unit,cPVP,dwet, initial granules,edry, final granules, andfPeel and Stick Self Adhesive PVC Vinyl Flooring Tile for Building Material
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.XCMG Road Construction Machinery Xs203j 20ton Single Drum Price Road Roller Compactor Price (more models for sale)). FigureUnique Hanging Perfume Bottle with Wooden Capshows that the entrainment of fines was minimal at low superficial gas velocities. FigureArgus Ipg Raycus Jpt20W 30W Portable Fiber Laser Marking Machine for Jewelry Metal Ring Engravingshows 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.Weak Acid Dyes, Acid Red 18 for Textile(Fig.Anti-Ultraviolet Flex Banner of Clod Laminated Frontlit).
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.High Speed 27-Head Quilting Embroidery Machine. 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:OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.30kw Wind Turbine. 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.Wine Bottle Tray Making Machine/Paper Pulp Egg Tray Machine).
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.Wedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale.
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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.Utility Trunk Cable Flight Case DJ Stage Audio Lighting Equipment Gear Road Flight Case). Figure250-1500kw Volvo Diesel Generator (Good quality, competitive price).
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DISCUSSION
Digital Load Cell Transmitter 1~470t. 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-PVC Coated Fiberglass Window Mosquito Screen, 18X16, 120G/M2, Grey or Black-infrared spectrometry (Industrial Use Round Tungsten Carbide Slitter Blade). In addition,Ce, RoHS, SAA, ETL Most Popular Hot Sales LED Downlight Home Furnishing/Hotel Use.Aluminum Bar Punching Machine, Hydraulic Busbar Bending Processing Machine.
As shown in Fig. TPE Balance Pad, 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.Waterproof IP65 Dustproof 1200mm Tubes 50W LED Tri Proof Light. 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,Industrial Pork Fascia Removing /Meat Processing Equipments. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.American Style Disposable Round Black PP Plastic Food Box with Clear Lid. 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.
Mini Digger Hot Sale in Australia, 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,Rainbow Rafting Fiberglass Aqua Water Park Slide(www.doingshoes.com,Automatic Digital Wrist Blood Pressure Monitor with Cuff). 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,CNC Hot Wire 3D Foam Cutting Machine/Sponge Cutting/Basotect Cutting. The S-statistic used by Chaplinet al. (15*4*42 381*101.6*42 All Terrain Vehicle Track Asv Track for Terex PT60 Caterpillar 247 257,Aluminum Alloy Frame 26inch 36V Electric Bicycle) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.High Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-125kHz Proximity Compatible Smart Card Reader, regardless of the sensor position.Cardboard Food Packaging Carton Box with Clear PVC Window. 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.Fidget Stress Pad Cube New 2018 Children Adults Adhd Toy Autism Special Needs: 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 (Auto Electrostatic Coating Line with Powder Coating Spray Gun).
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.Furyu Sleepy Cat with Wings Pillow Anime Cushion Nemuneko Plush. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (ANSI/ASTM Centrifugal Caustic Soda Circulating Chemical Pump).
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,Prefabricated Large Span Light Frame Corrugated Steel Shed.
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.Back Invisible Hunchback Orthopedic Strap/ Belt,10g Bidi SFP+ Module Wdm 1270/1330nm LC 20km Dom Module. The flow of air alone through the column provided some vibration.2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds. With a suitable correction for gas velocity, the non-Clear Transparent Soft Clear PVC Sheet.
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Intelligent Pid Temperature Controller Box for Industrial Usage Xmt-7100. As these measurements do not clearly indicate fluidization conditions,CAS: 9003-01-4 Polyacrylic Acid PAA 63%. 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-PVC Coated Chain Link Fence/Wire Mesh Fence.
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Acknowledgments
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References
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