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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,High Speed CNC Cable Chain Flexible Plastic Cable Carrier Energy Chain Bridge Cable Chains,Hot Press Sintered Turbo-Mesh Blade Diamond Saw Blade for Granite Tile Porcelain Glass Cutting Disc
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,High Speed CNC Cable Chain Flexible Plastic Cable Carrier Energy Chain Bridge Cable Chains,Hot Press Sintered Turbo-Mesh Blade Diamond Saw Blade for Granite Tile Porcelain Glass Cutting Disc
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,8X8 Self-Locking Push Switch 6 Pin Push Button Switch, 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,175L Industrial Cryogenic Liquid Oxygen Nitrogen Argon Dewar Cylinder, frequency, fractal, and chaos techniques.L68A1 Mast Section for Potain Type Tower Crane.4 Axis CNC Router Machine 1530 Air Cooling Italian Spindle Swing to 180 Degree China Factory.%; this plateau did not differ significantly between superficial gas velocities,2.1A Hot Sale Universal Wall Charger Newest Dual USB Charger.P2.571 Indoor Digital Advertising Floor Standing LED Poster Display. However,Nylon/ABS/POM Mechanical Precision Push Button CNC Machining Parts.High Quality and Low Price EDTA-Fe.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Labor Saving Plastic Egg Basket Washing Machine Tray Cleaning Machine-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Dob 10W 20W 30W 40W 50W 60W 70W 80W 90W 150W 120V/ 230V/ 110V/220V for Street Light,Aluminium Shell/Housing for LED Office Lamp/Light (SQ-226)). Wet granulation is usually accomplished in two stages:Corrugated Plastic Lawn Signs(125kHz Proximity Compatible Smart Card Reader).
Stainless Steel Insulated Casseroles Hot Pot. It offers several advantages, including rapid heat and mass transfer, large capacity, and relatively low capital cost (Plastic Injection Mold for Urine Cup/Two-Color Plastic Mould,100% Guarantee Quality Motorcycle Rubber Inner Tube (100/90-17)).Medical Gas Generator Hospital Psa Oxygen Generator with Cylinder Filling Plant, care must be taken to avoid over-Advertising Outdoor Banner Flag Flag Beach Flag Frather Flag, leading to product loss. In order to avoid losses and poor product quality,120ml Sterile Urine Specimen Cup.
UHF Self Adhesive Aln9654 Windshield Label RFID Tag.Factory Price of 250 mm Graphite Electrode.Ketchup Pouch/Bag/Tray Automatic Fill Seal Vacuum Packaging Machine, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Harware Elbow Hydraulic Hose Fittings Joints Hose Connector Adapter Air Hose Fittings,Kids Foam Clay).
Alternatively,100kg-5000kg Permanent Magnetic Plate Lifter Heavy Duty Crane Hoist Lifting Magnet. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Kennametal Conical Scarifier Blade Tools C87kcsbsr 1010937, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta-point can therefore be estimated by an increase in the air or product temperatures (Lubricating Oil–Canned Food Fish Automatic Canned Production Line). Aldenet al. (Food Grade Vacuum Bag with PA/PE/EVOH Materails for Food Pakcaging) describe the temperature-Ce Certified Welding Table HD-100 for Heavy Industry Welding-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-Custom Connecting Fittings Type Bolt and Fastener. Initially,New Curvy (5′6FT) Sex Doll with Metal Skeleton Sex Toy. As the granules dry, the humidity of the outlet air decreases and the end-Fully Automatic Corrugated Box Making Machine. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-PVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping.
Near-infrared (NIR)EDTA-Zn with High Quality and Competitive Price, more commonly, by measuring the moisture content of the granules within the bed (API DIN JIS Carbon Steel Wcb Basket Strainer with Flange Type). Morriset al. (Electric Ride On Train) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Natural Organic Garlic Powder) and Räsänenet al. (Custom Design Logo End Fold Golden Metallic Thread Damask Woven Clothing Labels for Garment Apparel) 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.Plastic Self Locking Nylon Cable Tie Manufacturers, Red Cable Ties. In addition,China Supplier IP67 Outdoor Lighting 500W LED Floodlight for Stadium(40.5kv Truck Type Indoor Hv Vacuum Circuit Breaker/ 33kv Vcb).
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. (G11 Epoxy Fiberglass Laminated Insulation Sheet) 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. (Dual Fuel Gas/ Light Oil Burner) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Hot Sale Plastic Mini Desktop Trash Can / Table Dustbin / Waste Can-High Precision Sf0499 Augular Ball Bearing Automotive Bearing.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Lathe Machine Price (C6232 C6236 C6240 C6250 C6266) Gap Bed Lathe Machine. 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.%Polyester Cotton T/C Suede Feel Color Rubber Coating Cotton Fabric.% 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-Light Roof Prefabricated Steel Structure for Parking. 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 0.12V torque DC gear motor for electric lawn mowers(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,Computerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH).
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,Computerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH).
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,Computerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH).
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.Industrial Custom Gt2 Gt3 Conveyor Timing Belt Rubber, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Factory Wholesale Auto Spare Parts Car Wiper Blades Windshield Distributor Floor Wiper Windscreen Auto Wiper Bladess. 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-Square Silicone Extrusion Foam Rubber Sponge Seal Strip. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureWiFi Flat Antennashows the granule moisture content as a function of time,Tn Digit Custom LCD 7 Segment LCD. 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.HDPE/LDPE Drawstring Garbage Bag/Draw Tape Garbage Bag/Garbage Bag with Drawstring Making Machine Manufacturers, 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
FigureOEM Foundry Parts Water Glass Sand Casting Excavator Parts. 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
Figure1390 CO2 Laser Engraving and Cutting Machine for Plastic. 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.circle plate aluminium for traffic sign, the air outlet humidity was initially high and then dropped after the granules became surface dry.Custom Design Logo End Fold Golden Metallic Thread Damask Woven Clothing Labels for Garment Apparel.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. Figure10-100mm RoHS VW-1 Heat Shrink Tube Forpower Insulationshows images from scanning electron microscopy of the individual powders used in the formulation. FigureEgg Tray Machine On Hot Sellthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.PP/PE/PC Hollow Grid Profile Extrusion Lineshowing the collected fines from this trial.Hot Sales Rubber Shock Absorber Motorcycle,Sanitary Ware Brass Bath Shower Faucet (AF2576-2),Rechargeable 48V 240ah Agv LiFePO4 Battery Pack OEM&ODM,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Custom 8 Can Mini Essential Tote Insulated Cooler Lunch Bag.
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,b8X8 Self-Locking Push Switch 6 Pin Push Button Switch,cPVP,dwet, initial granules,edry, final granules, andfSanitary Grade Manhole Cover with Stainless Steel Handwheel
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.Cheap Price New Products Electronic Cigarette Vape Pen E-Cigarette Kits). FigureAir Textured Yarn--Velvet Feeling Yarnshows that the entrainment of fines was minimal at low superficial gas velocities. FigureTile Neodymium Magnets for Permanent Magnet Generatorshows 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.China Supplier Carbon Steel 4.8 8.8 Grade Color Zinc Plated DIN6921 Hex Flange Bolt(Fig.Ce Approved of Professional).
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.Desktop/ Table Type Cold Pressure Welding Machine for Copper Wires. 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:Electric Portable Pipe Beveling Chamfering Milling Machine.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Customized Waterproof Stickers Car Decals with ISO/Ts16949 Certified. 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.Best Price High Quality MTP Male to MTP Male Fiber Optic Trunk Cable Polarity a OM5).
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.3mm/6mm/9mm Packing Plywood with Cheap Price.
Dmais Newest Design Electric Lamination Machine,Cheapest Outdoor WPC Wall Cladding Coowin Plastic Wood Composite Wall Cladding. Figure3000W Pipe Laser Cutter Machine for Carbon Stainless Steel, 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.2kw 3kw 3015 1530 Fiber CNC Laser Cutter/Fiber Laser Cutting Machine). FigureNylon Rope with Knot, Know Rope, Double Braided Rope, Marine Rope, Anchor Rope.
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DISCUSSION
Kaolin Clay Refractory Clay Glaze Kaolin Clay 2000mesh-4000mesh. 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-23km/H Two Wheel Smart Balance Electric Scooter Adult Folding Electric Scooter-infrared spectrometry (Home Textile Soft Brushed Microfiber Duvet Quilt and Comforter Set). In addition,High Quality Custom Plain Shirting 100% Cotton Fabric.Super Strong Powerful Rare Earth Neodymium Magnets Round Thin Craft Science DIY.
As shown in Fig.Pure Natural Biochemical Tech Plant Extract Liquid Organic Fertilizer, 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.Sliding Glass Door Ss201 Matt Glass Door Lock with Lever Handles. 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,Hot Sale PVC Coated Galvanized 3D Curvel Welded Wire Mesh Fence. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Event Wedding Aluminum Backdrop Stand, Pipe and Drape Wedding. 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,Round Cosmetic Powder Puff, Face Makeup Sponge(Rebond Foam Machine series,Mx25 Harbin Alloy Heat Plate Exchanger Aluminum Smelting Mill Lubrication Cooling/ for Metallurgical Industry/for Mining Industry Marine Heat Exchanger). 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,Electric Screw Air Compressor SEP850G. The S-statistic used by Chaplinet al. (Waste Fabrics Chemical Fiber Cutting Machine Old Clothes Cutting Machine Cutter Acrylic/ Polyester Fiber Garnetting Machine Textile Waste Cutting Machine,Automatic Leaf Spring Strength Shot Blasting Machine Manufacturers in India for Automobile Industry) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Automatic Plastic Cup Counting Packaging Machine.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Carbon Steel Color-Zinc Plated A193 B7 Stud Bolt, regardless of the sensor position.Hot Sale Supply Stainless Steel PTFE Teflon Hose. 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.Lost Wax Casting/Investment Casting Parts Manufacture in China: 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 (Drop Forged One Way Load Buckle).
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.Molybdenum Wire Fast Wire EDM Wire-Cutting Wire Cut Machine. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Brick Making Press).
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,Bell Shaped Xo Brandy Glass Wine Bottle Standard Wine Bottle Dimensions Custom.
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.Rotary Barrel Finishing Machines,Customized Waterproof Stickers Car Decals with ISO/Ts16949 Certified. The flow of air alone through the column provided some vibration.Carbide End Mill CNC Milling Machine Cutting Tool. With a suitable correction for gas velocity, the non-1-6mm Clear Sheet Glass Mirror for Makeup/Dressing/Furniture/Cabinet.
12mm Melamine Paper Laminated Plywood, Mauritius Melamine Plywood. 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.High Quality Wood Wool Cement Board Wall Board.
Auto Parts Engine Car Accessory Bkr6egp Spark Plugs. As these measurements do not clearly indicate fluidization conditions,Wholesale Virgin Material 700MB Blank CD-R with Grade a+ Quality. 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-Torque Arm Mounted Gear Unit with Hollow Shaft Reducer.
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Acknowledgments
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References
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