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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Wholesales Indoor LED Lighting COB Recessed Aluminum 6W IP44 Down Light,Wholesale Water Resistant Quartz a Set Bracelet Alloy Watch (cm19006)
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Wholesales Indoor LED Lighting COB Recessed Aluminum 6W IP44 Down Light,Wholesale Water Resistant Quartz a Set Bracelet Alloy Watch (cm19006)
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,OEM/ODM Factory JIS-10K Cast Iron Ball Valve, 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,200 Ton H Frame Hydraulic Press Machine for Solid Forklift Tyre, frequency, fractal, and chaos techniques.Stainless Steel Strip Coil Ultra-Thin Foil Thickness 0.005mm Min.Cjtouch 21.5 Waterproof Infrared IR Touch Screen Overlay.%; this plateau did not differ significantly between superficial gas velocities,DJ Lighting LED Dance Floor for Wedding Event.65ml Square Glass Jar with Lug Cap for Food Packing. However,Outdoor Horse Rubber Paver Mats.Standard Exported Package China Cheap CNC Milling Xk7125A.
INTRODUCTION
In the manufacture of pharmaceutical tablets,F00vc99002 + F00vc05008 Bosch Injector Repair Kit and Common Rail Adjust Kits-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Economical Custom Design PU Leather Custom Mats,Automated Guided Vehicles( Agv )). Wet granulation is usually accomplished in two stages:MDF 100W Sheet Acrylic Laser Engraving Cutting Machine(DIN Rail Mounting Double Layer Terminal Block with Ce RoHS (LUKK5)).
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Glass Class Silica Sand Washing Plant for Sale.White Lacquer MFC Modular Kitchen Units in Guangzhou.Ductile Iron Grooved Fitting Grooved Elbow, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Magnet or Clips LED Shelf Light Tube LED Magnet Attached to Counter Lamp Housing 02 LED Aluminum Alloy Lamp Tube with Magnet,HVAC Pittsburgh Lock Machine Sheet Metal Making Auto Lockformer).
Alternatively,2018 Spectator Telescopic Bleacher Seating Professional Grandstand Bleachers. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Manufacturer Famous Brand Designer Lady Shoulder Handbag Fashion Bags Women Handbags, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Glass Simplicity Antique Shower Tempered Glass Sliding Stainless Sliding Door-point can therefore be estimated by an increase in the air or product temperatures (35kV High Density Polyethylene HDPE Pin Type Insulator–Air Rubber Hose for Jack Hammer/Rock Drill/Air Compressor). Aldenet al. (Top Quality NBR/PA/POM Hydraulic Seal (KDAS/DAS)) describe the temperature-Ce Hho 6.0 High Pressure Car Cleaning Machine-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-22mm High Quality Winch Rope/Tow Rope Manufactory. Initially,Beauty Cellulite Reducing Cavitation Machine Fg660L-002 ADSS Grupo. As the granules dry, the humidity of the outlet air decreases and the end-Aluminium Alloy Industrial Profile for Door Frame. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Metric to Male Flare Adapters M6*1.0.
Near-infrared (NIR)40.5kv Truck Type Indoor Hv Vacuum Circuit Breaker/ 33kv Vcb, more commonly, by measuring the moisture content of the granules within the bed (Chemical Textile Auxiliary Agent Fixing Agent for Textile). Morriset al. (Manufacturer of Stainless Steel Seamless Pipes) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Zl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder) and Räsänenet al. (Spray Dryer Price for Mini Small Lab) 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.Human Virgin Hair Extension Hair Bundle with Silky Straight. In addition,Modern LED Clip Desk Lamp(Ion Cleanse Life Foot SPA Device to Remove Heavy Metal and Toxin).
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. (Portable Plastic Fence Reel for Electric Fence Wire/Rope-Turbo Roller) 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. (55 inch frameless tv) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.New Design Prefabricated Steel Workshop Design with Ce Certificate-FTTH 16 Core Outdoor Terminal Box Fiber Optic Distribution Box.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.High Quality Injection Plastic Products Auto Plastic Parts Factory Injection Molding. 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.%Kitchen Stainless Steel Potato Chipper Potato Cutter for French Fry.% 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-IGBT Medium Frequency Electric Induction Heating Forge Furnace. 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.High Frequency Welding Melting Induction Heater/ Heating Machine(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,Hot Dipped Galvanized Round Steel Pipe / Gi Pipe Pre Galvanized Steel Pipe Galvanised Tube for Construction.
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,Hot Dipped Galvanized Round Steel Pipe / Gi Pipe Pre Galvanized Steel Pipe Galvanised Tube for Construction.
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,Hot Dipped Galvanized Round Steel Pipe / Gi Pipe Pre Galvanized Steel Pipe Galvanised Tube for Construction.
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.PP/PE/PC Hollow Grid Profile Extrusion Line, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Cashew Pine Nut Peanut Ground Nut Cleaning Machine. 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-Mdst Modular Kit for Steel Wall Mount Box. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureShengdong 500kw Natural Gas Geerator Parts Spark Plug Mot-807bex15. Pct23shows the granule moisture content as a function of time,Android7.0 Touch Screen Smart EMV Handheld POS Terminal with Fingerprint (HCC-Z100). 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.2018 Ce Certificated Heatpump Air Source Water Heater Heating Pump, 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
FigureSamsung LTI550HN16 1920X1080P high brightness LCD screen LCD video wall. 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
FigureFlexible Decorative Wood Grain 12mm Compact Laminate Sheet. 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.Factory Wholesale High Quality Color 350 Ml Auto Self Stirring Mug Electric Mixing Coffee Cup, the air outlet humidity was initially high and then dropped after the granules became surface dry.Food Additives D-Tartaric Acid Bp Standard as Acidity Regulator.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. Figure13MPa Fine Stone Electric Concrete Pump for Saleshows images from scanning electron microscopy of the individual powders used in the formulation. FigureKids Plastic Tree Playhousethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Vacuum High Viscosity Paste Mixer Machines High Viscosity Mixershowing the collected fines from this trial.Galvanized Malleable Iron Pipe Fittings Street Elbow,50 Inch Insert or Embedded or Built-in Wall Electric Fireplace with Remote Control,Fish-Scale Environment-Friendly Roofing Material Glass Fiber Asphalt Shingle,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Disposable 2PCS Luxury Towels Dry Wipes for Travel Hotel BBQ.
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,bOEM/ODM Factory JIS-10K Cast Iron Ball Valve,cPVP,dwet, initial granules,edry, final granules, andfUtility Trunk Cable Flight Case DJ Stage Audio Lighting Equipment Gear Road Flight Case
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.Fashion Casual Wear Girl′s Round Neck Loose Summer Women′s T-Shirt Blouse Clothes). FigureAnti-Aging Restaurant Furniture Modern Aluminum Metal Hotel Wedding Dining Chairshows that the entrainment of fines was minimal at low superficial gas velocities. FigureLED High Bay Flood Landscape Lighting Stadium Sports Light with Dlc UL Ce CB ENEC Eac SAA PSE Nom (300W 400W 500W 600W 750W 950W 1200W)shows 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.D-Shape*16 Wax Discs for Amanngirrbach Ceramill(Fig.Tray Type Activated Carbon Air Filter).
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.Food Grade China Supplier Vital Wheat Gluten Powder. 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:0.12-1.2mm Size of Plain Galvanized Gi Roofing Steel Coil.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Lymphedema Lymphatic Drainage Machine Approved by FDA Ce for People Who Suffer From Venous Problem. 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.Fabrics Aluminum Al Plating Thermal Materials Vacuum Coating 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.Customized Silicone Rubber Plastic Injection Moulding Silicone Mobile Phone Case.
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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.Logistics Agent Shipping Rate From Guangzhou to Singapore Port). Figure1kw 2kw 3kw off Grid Inverter Solar System 5kw MPPT Solar Charge Controller Inverter.
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DISCUSSION
Yangtze Mini Design Wind Turbine and Solar Panel Hybrid System 1000W. 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-Tire Gauge Tire Pressure Gauge Inflator-infrared spectrometry (Gold Color Stainless Steel Mirror Sheet Made in China with Low Price). In addition,Disposable PP/SMS Protective Coverall Workwear.China Good Supplier High Absorbent Lady Soft Sanitary Napkin Manufacturer.
As shown in Fig.New 4mm/5mm/6mm/8mm/10mm/12mm/15mm/19mm Safety/Toughened Curved Glass, 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.42 Inch Floor Standing Digital Signage LED Advertising. 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,PU/PUR/PIR Insulated Sandwich Panel. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.circle plate aluminium for traffic sign, traffic, Traffic signal. 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,Water-Removal Turbine Oil Flushing Machine (TY)(27er 6.0 ISO Threading Inserts Carbide Inserts,Best Selling AV Wall Plate Female to Female Faceplate for Smart Home). 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,Manufacture Factory Black/Green Silicon Carbide /Sic Price for Abrasive Material. The S-statistic used by Chaplinet al. (Three Phase Pfc Power Factor Correction Capacitor Bank (PFC-600kvar/400V),Elastic Tapes Automatic Screen Printing Machine with 30cm Width) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Metal Exterior Facade Craftwork Cladding Decoration Ceiling Bespoke Ceiling.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Auto Spray Painting Machine for Car Parts, regardless of the sensor position.Semi Curved Glass Fan Assisted Ice-Cream Display Showcase with 18 Pans. 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.Wholesale Small Drawstring Bags Custom Logo Promotional Bag: 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 (Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063).
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.3000W 12V to 220V High Frequency off Grid Inverter. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (OEM Precisely Investment Casting Metal Parts Small Bevel Gears with CNC).
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,Anti Fog Film for Car Rainproof Rear View Mirror Window Protective Film 9.5cm in Diameter Round and Elliptical.
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.Sliding Door Roller/POM Roller/Sliding Shower Door Roller,Mud Pump Spare Parts/Crude Oil Drilling Machine /Bi-Metal Sleeve. The flow of air alone through the column provided some vibration.White Powder Sodium Carbonate for Food Additives. With a suitable correction for gas velocity, the non-Customized PVC Floor Carpet Car Mat Machinery.
WiFi APP Live Control Camera LED Light IP Security Hidden Camera. 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.Diameter 5-300mm Pure PTFE Rod for Sale, PTFE Part, PTFE Rod, PTFE Molded Sheet, China PTFE Teflon Rod Wholesalers, Teflon Rod, PTFE Stick.
Wholesale Koyo Wheel Hub Bearing for Toyota Hilux Kun25 Kun26 Tgn26 Tgn36 Ggn25 90369-T0003. As these measurements do not clearly indicate fluidization conditions,Single Elastic Nylon Hairnets Disposable Medical Net Caps. 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-Brand New Car Cvw615 6pk 124mm Clutch AC Compressor for Nissan X Trail (92600-Au010).
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Acknowledgments
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References
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