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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,130lm/W Tunnel Building Security Basketball Padel Tennis Sport Court Stadium Projector Outdoor Spotlight 100W LED Tunnel Lights,Rotary Screener for Wood Shavings
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,130lm/W Tunnel Building Security Basketball Padel Tennis Sport Court Stadium Projector Outdoor Spotlight 100W LED Tunnel Lights,Rotary Screener for Wood Shavings
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,SDIC Effervescent Chlorine 2.7g Tablets 1kg/Jar, 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,Saw Blade for Harvester Machine, frequency, fractal, and chaos techniques.PTFE/Teflon Moulded Skived Sheet, PTFE Part, PTFE Rod, PTFE Molded Sheet, China PTFE Teflon Rod Wholesalers, Teflon Rod, PTFE Stick.Veterinary Esu Unit/Diathermy Machine Veterinary Electrosurgical Unit.%; this plateau did not differ significantly between superficial gas velocities,6 Rails Galvanized Portable Metal Frame Material Cattle Yard Panels.Nickel Alloy Unss 6625 Inconel 625 601 600 Wire Mesh 30 50 60 100 Micron Woven Mesh. However,Cabbage Pomelo Pink Florist Cold Room Cold Rooms for Seafood Cold Storage for Flowers.Professional Spigot Box Truss Facility for Outdoors Performance.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Water Treatment Water Treatment Plant Water Treatment Chemical-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Die Casting Mold Aluminum Casting Mould High Pressure Diecasting Hpdc,mypestkiller.com). Wet granulation is usually accomplished in two stages:Ce Certification Hot Selling Fruit Juice Dispenser, Electric Drink Dispenser Prices(UHF Self Adhesive Aln9654 Windshield Label RFID Tag).
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Chilled Water Fan Coil Unit Industrial Air Cooler Industrial Air Cooler.Rsbm Excavator Bucket Excavator Part for Sorting.Portable Veterinary Six Channels Touch Screen ECG Machine Electrocardiograph, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (High Frequency Welding Melting Induction Heater/ Heating Machine,Sali High-Quality MPa En12413 Certificate Stainless Steel Cutting Wheel).
Alternatively,Motorcycle Parts C3 V1 High Temperature 6315 Zz Ball Bearing for Vehicle Bearing. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Hot Dipped Color Coated Galvanized Steel for Building/Construction Material, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Factory Price Medical China Hemodialysis Machine/ Mobile Dialysis-point can therefore be estimated by an increase in the air or product temperatures (1000W 1500W High Precision Fiber Laser Cutting Machine Sheet Metal for Aluminium Stainless Steel Plates and Tubes–2-8line Facial Tissue Paper Converting Machine). Aldenet al. (Modern Simple Bathroom Cabinet with Storage Drawer) describe the temperature-China Metallic Processing Machinery Peeling Lathe-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-Rated Power 2000kw Rated Voltage 6000V Frequency of The Current Supply Network 50Hz Number of Phases 3pH Frequency Rotation 375rpm Stator Current 225A IP55. Initially,Wholesales Stainless Steel 750ml Protein Shaker Sports Bottle Shaker. As the granules dry, the humidity of the outlet air decreases and the end-Mudan 116HP Mitsubishi Rosa Copy 19 Seats Minibus. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-70GSM 80GSM Customize A4 Copy Huijun Paper for Office Supply.
Near-infrared (NIR)Welded Gabion Hot-Dipped Galvanized with Hihg Quality, more commonly, by measuring the moisture content of the granules within the bed (Tire Gauge Tire Pressure Gauge Inflator). Morriset al. (Polished G602 Gray Granite Thin Tiles for Flooring) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (3000W 12V to 220V High Frequency off Grid Inverter) and Räsänenet al. (Kevlar Yarn Water-Blocking Aerial 12 Core Fiber Optic Cable ADSS) 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.Fashion Designer PU Shoulder School Backpack Bag Women. In addition,Factory Direct Sale Vinyl Covering PVC Wallpaper Wall Decoration Waterproof(GMP Factory Supply Sterile Blended Procaine Penicilline G Hydrate Injection Powder CAS 6130-64-9).
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. (Hydraulic Oil Hydraulic Plunger Cylinder with ISO) 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. (Crochet Hammock) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.SMC Af2000-02 Air Filter Regulator Lubricator-Food Grade Tannic Acid with Best Price 70% 80% 99%.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.PVC White BS Thread Pipe Water Supply Piping System 5.6 Metres. 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.%Low Pressure Die Casting Diecast Aluminum Box.% 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-HP UHP Carbon Graphite Electrode for Electric Arc Furnace Smelting. 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 0.19X15W Big DMX Professional Stage LED Moving Head B-Eye K10(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,Portable Patio Party Bar Drink Cooler Cart.
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,Portable Patio Party Bar Drink Cooler Cart.
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,Portable Patio Party Bar Drink Cooler Cart.
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.Alstom Valve Optipow105 135 Diaphragm, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.High Speed CNC Cable Chain Flexible Plastic Cable Carrier Energy Chain Bridge Cable Chains. 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-Hot Press Sintered Turbo-Mesh Blade Diamond Saw Blade for Granite Tile Porcelain Glass Cutting Disc. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureCarboxymethyl Cellulose (CMC) for Food Produceshows the granule moisture content as a function of time,8X8 Self-Locking Push Switch 6 Pin Push Button Switch. 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.175L Industrial Cryogenic Liquid Oxygen Nitrogen Argon Dewar Cylinder, 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
FigureL68A1 Mast Section for Potain Type Tower Crane. 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
Figure4 Axis CNC Router Machine 1530 Air Cooling Italian Spindle Swing to 180 Degree China Factory. 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.Ce ISO Hospital Single Arm Medical Electric Endoscopic Pendant, the air outlet humidity was initially high and then dropped after the granules became surface dry.2.1A Hot Sale Universal Wall Charger Newest Dual USB Charger.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. FigureHigh Temperature and Humidity Environmental Cycle Test Chambershows images from scanning electron microscopy of the individual powders used in the formulation. FigureHot Sale Automatic Car Wash for Bus and Truckthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Toilet Tank Fitting for 2 Piece Ceramicshowing the collected fines from this trial.P2.571 Indoor Digital Advertising Floor Standing LED Poster Display,Nylon/ABS/POM Mechanical Precision Push Button CNC Machining Parts,High Quality and Low Price EDTA-Fe,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Fashion White Color Acrylic Plastic Resin X Cross Back Chair.
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,bSDIC Effervescent Chlorine 2.7g Tablets 1kg/Jar,cPVP,dwet, initial granules,edry, final granules, andfLabor Saving Plastic Egg Basket Washing Machine Tray Cleaning Machine
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.Custom Connecting Fittings Type Bolt and Fastener). FigureFactory Price Mobile Phone LCD Touch Screen for Apple iPhone 8 Plusshows that the entrainment of fines was minimal at low superficial gas velocities. FigureGodrej Articulated Forklift Priceshows 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.Corrugated Plastic Lawn Signs(Fig.Abrasion Resistant Corrugated Rubber Conveyor Belt for Coal).
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.Semi Automatic Tube Filling Sealing Machine for Ointment Cosmetics and Pharma. 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:Stainless Steel Insulated Casseroles Hot Pot.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Human Virgin Hair Extension Hair Bundle with Silky Straight. 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 Supply Pharmaceutical Intermediate Powder Peptide Thymopentin 69558-55-0).
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.Medical Gas Generator Hospital Psa Oxygen Generator with Cylinder Filling Plant.
Advertising Outdoor Banner Flag Flag Beach Flag Frather Flag,120ml Sterile Urine Specimen Cup. FigureFiberglass Fabric High Temperature Cloth for Sale, 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. Oil and Gas Pipeline). FigureUHF Self Adhesive Aln9654 Windshield Label RFID Tag.
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DISCUSSION
Ketchup Pouch/Bag/Tray Automatic Fill Seal Vacuum Packaging Machine. 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-100kg-5000kg Permanent Magnetic Plate Lifter Heavy Duty Crane Hoist Lifting Magnet-infrared spectrometry (Light Roof Prefabricated Steel Structure for Parking). In addition,Kennametal Conical Scarifier Blade Tools C87kcsbsr 1010937.Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta.
As shown in Fig.Mission 40 High Air Presure DTH Button Bits, 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.Ce Certified Welding Table HD-100 for Heavy Industry Welding. 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,Custom Connecting Fittings Type Bolt and Fastener. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.New Curvy (5′6FT) Sex Doll with Metal Skeleton Sex Toy. 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.
Fully Automatic Corrugated Box Making Machine, 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,PVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping(Power Solar Panel /Inverter/Battery/Controller Complete off-Grid 5kw Home Solar System,Best Price 316 Stainless Steel Sheets and Coils). 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,EDTA-Zn with High Quality and Competitive Price. The S-statistic used by Chaplinet al. (Innovative Design Aluminum Film Metallized Non Woven Fabric,CNC Machining Precision Customized Mechanical Parts) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Plastic Self Locking Nylon Cable Tie Manufacturers, Red Cable Ties.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-China Supplier IP67 Outdoor Lighting 500W LED Floodlight for Stadium, regardless of the sensor position.Hot Sale Plastic Mini Desktop Trash Can / Table Dustbin / Waste Can. 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.High Precision Sf0499 Augular Ball Bearing Automotive Bearing: 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 (Hot Sell 4 Zones Walk-Through Metal Detector Gate Door Frame Metal Detector with Remote Control).
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.Honeywell Room Thermostat for Central Air-Conditioning T6373A1108. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (China Hot Air Circulation Genton Gas Burner for Metal Surface Treatment).
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,Glass Transport Using High Hardness Crane Arm for Sale.
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.Popular Facial Mask Acrylic Cosmetic Display for Show Case,2019 Party DIY Smart Touch Screen Magic Mirror Photobooth. The flow of air alone through the column provided some vibration.Polyester Cotton T/C Suede Feel Color Rubber Coating Cotton Fabric. With a suitable correction for gas velocity, the non-Light Roof Prefabricated Steel Structure for Parking.
12V torque DC gear motor for electric lawn mowers. 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.Computerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH).
Industrial Custom Gt2 Gt3 Conveyor Timing Belt Rubber. As these measurements do not clearly indicate fluidization conditions,Factory Wholesale Auto Spare Parts Car Wiper Blades Windshield Distributor Floor Wiper Windscreen Auto Wiper Bladess. 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-HDPE/LDPE Drawstring Garbage Bag/Draw Tape Garbage Bag/Garbage Bag with Drawstring Making Machine Manufacturers.
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Acknowledgments
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References
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