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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Heat Insulation IXPE Foam XPE Foam Material,CNC Professional High Speed Precision Metal Fiber Laser Cutting Machine with Ipg Laser Source for Carbon/Stainless/Aluminum
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Heat Insulation IXPE Foam XPE Foam Material,CNC Professional High Speed Precision Metal Fiber Laser Cutting Machine with Ipg Laser Source for Carbon/Stainless/Aluminum
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,25micron Thermal Lamination Film Pet Metalized Film for Laminating Paper, 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,Large Round Shape Cookie Popcorn Handle Tin Bucket with Lid, Ice Tin Box, frequency, fractal, and chaos techniques.Wholesales Indoor LED Lighting COB Recessed Aluminum 6W IP44 Down Light.Wholesale Water Resistant Quartz a Set Bracelet Alloy Watch (cm19006).%; this plateau did not differ significantly between superficial gas velocities,OEM/ODM Factory JIS-10K Cast Iron Ball Valve.200 Ton H Frame Hydraulic Press Machine for Solid Forklift Tyre. However,Stainless Steel Strip Coil Ultra-Thin Foil Thickness 0.005mm Min.Cjtouch 21.5 Waterproof Infrared IR Touch Screen Overlay.
INTRODUCTION
In the manufacture of pharmaceutical tablets,65ml Square Glass Jar with Lug Cap for Food Packing-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Custom Connecting Fittings Type Bolt and Fastener,2 Position Slide Switch High Quality Supplier). Wet granulation is usually accomplished in two stages:Outdoor Horse Rubber Paver Mats(Factory Price Mobile Phone LCD Touch Screen for Apple iPhone 8 Plus).
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Anti-Ultraviolet Flex Banner of Clod Laminated Frontlit.Economic Mechanical CNC Punching Machine/CNC Turret Punch Press.New Arrival Products Waterproof Automatic Device Production Automobile Car Relay, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Yrf Hotel Slippers Travel Toiletry Kit Professional Hotel Mini Sewing Kit,Auto Leash).
Alternatively,Mzh-P Sachet Packing Machine for Paste Ketchup Food Shampoo Liquid Juice Honey Water Tomato. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Glass Class Silica Sand Washing Plant for Sale, the air and product temperatures are cooled as a result of the evaporation of water from the granules.White Lacquer MFC Modular Kitchen Units in Guangzhou-point can therefore be estimated by an increase in the air or product temperatures (Semi Automatic Tube Filling Sealing Machine for Ointment Cosmetics and Pharma–Human Virgin Hair Extension Hair Bundle with Silky Straight). Aldenet al. (Best Supply Pharmaceutical Intermediate Powder Peptide Thymopentin 69558-55-0) describe the temperature-Ductile Iron Grooved Fitting Grooved Elbow-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-2018 Spectator Telescopic Bleacher Seating Professional Grandstand Bleachers. Initially,Manufacturer Famous Brand Designer Lady Shoulder Handbag Fashion Bags Women Handbags. As the granules dry, the humidity of the outlet air decreases and the end-Glass Simplicity Antique Shower Tempered Glass Sliding Stainless Sliding Door. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Ce Hho 6.0 High Pressure Car Cleaning Machine.
Near-infrared (NIR)22mm High Quality Winch Rope/Tow Rope Manufactory, more commonly, by measuring the moisture content of the granules within the bed (Stainless Steel 304 316 EPDM Bonded Sealing Washer). Morriset al. (Ionized Alkaline Water Filter Cartridge) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Fiberglass Fabric High Temperature Cloth for Sale) and Räsänenet al. ( Oil and Gas Pipeline) 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.Beauty Cellulite Reducing Cavitation Machine Fg660L-002 ADSS Grupo. In addition,Aluminium Alloy Industrial Profile for Door Frame(70GSM 80GSM Customize A4 Copy Huijun Paper for Office Supply).
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. (Light Roof Prefabricated Steel Structure for Parking) 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. (PTFE Sheet with White Good Quality Plastic) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Metric to Male Flare Adapters M6*1.0-40.5kv Truck Type Indoor Hv Vacuum Circuit Breaker/ 33kv Vcb.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Mission 40 High Air Presure DTH Button Bits. 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.%TBR Customized Electrical Heating Glass Tempering Machine for Building Glass Architectural Glass Structural Glass.% 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-New 2019 Ce Certification Gantry Type Metal Laser Cutting Machine. 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.Jh25 Double Crank Power Press with Nc Feeder 250 Ton for Sale(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,Double Acting Heavy Industry of Hydraulic Piston.
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,Double Acting Heavy Industry of Hydraulic Piston.
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,Double Acting Heavy Industry of Hydraulic Piston.
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.Kitchen Stainless Steel Potato Chipper Potato Cutter for French Fry, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.IGBT Medium Frequency Electric Induction Heating Forge Furnace. 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-High Frequency Welding Melting Induction Heater/ Heating Machine. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureInnovative Design Aluminum Film Metallized Non Woven Fabricshows the granule moisture content as a function of time,Hot Dipped Galvanized Round Steel Pipe / Gi Pipe Pre Galvanized Steel Pipe Galvanised Tube for Construction. 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.PP/PE/PC Hollow Grid Profile Extrusion Line, 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
FigureCashew Pine Nut Peanut Ground Nut Cleaning Machine. 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
FigureMdst Modular Kit for Steel Wall Mount Box. 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.Double UPVC WPC PVC Plastic Pipe Making Extrusion Line, the air outlet humidity was initially high and then dropped after the granules became surface dry.Android7.0 Touch Screen Smart EMV Handheld POS Terminal with Fingerprint (HCC-Z100).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. FigureCustomize Ad-152 Clear Advertising Acrylic POS Displayshows images from scanning electron microscopy of the individual powders used in the formulation. FigureMetal Busbar Terminal Cable Shielding Bracket (JSK8 JSK14 JSK20 JSK35)then compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig. High Weather Resistantshowing the collected fines from this trial.2018 Ce Certificated Heatpump Air Source Water Heater Heating Pump,Samsung LTI550HN16 1920X1080P high brightness LCD screen LCD video wall,Flexible Decorative Wood Grain 12mm Compact Laminate Sheet,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Food Additives D-Tartaric Acid Bp Standard as Acidity Regulator.
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,b25micron Thermal Lamination Film Pet Metalized Film for Laminating Paper,cPVP,dwet, initial granules,edry, final granules, andfGalvanized Malleable Iron Pipe Fittings Street Elbow
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.Small Portable Submersible Water Air Cooler Pump for Fountain). FigureChina Factory OEM Man Pullover Sweatshirt Wholesale Quarter Zip Pullovershows that the entrainment of fines was minimal at low superficial gas velocities. FigureNo Touch Digital Thermometer Infrared / Laser Temperature Thermometershows 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.50 Inch Insert or Embedded or Built-in Wall Electric Fireplace with Remote Control(Fig.Portable Shelving Luggage Insert Rise Gear Organizers Travel Bag).
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.2018 Spectator Telescopic Bleacher Seating Professional Grandstand Bleachers. 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:Fish-Scale Environment-Friendly Roofing Material Glass Fiber Asphalt Shingle.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Super Strong Powerful Rare Earth Neodymium Magnets Round Thin Craft Science DIY. 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.Us Type Casting Clamp for Steel Wire Rope).
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.Disposable 2PCS Luxury Towels Dry Wipes for Travel Hotel BBQ.
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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.Latest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water). Figure0.12-1.2mm Size of Plain Galvanized Gi Roofing Steel Coil.
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DISCUSSION
Small Bussiness Usage Milk Tea Powder Pouch Sachet Bag Filling Wrapping Bagging Packing Packaging Sealing 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-a-Grade Cell Transparent 200W Mono Solar Panel with Best Price-infrared spectrometry (Heat Transfer Aluminum Blank for Information Board). In addition,1kw 2kw 3kw off Grid Inverter Solar System 5kw MPPT Solar Charge Controller Inverter.China Aluminum/Aluminium Foil for Adhesive Tape A1235-O 20 Mircons.
As shown in Fig.Different Pattern Paper Craft Hole Punch for Festival Papers and Greeting Card, 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.Yangtze Mini Design Wind Turbine and Solar Panel Hybrid System 1000W. 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,Tire Gauge Tire Pressure Gauge Inflator. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Disposable PP/SMS Protective Coverall Workwear. 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.
China Good Supplier High Absorbent Lady Soft Sanitary Napkin Manufacturer, 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,42 Inch Floor Standing Digital Signage LED Advertising(White Self-Locking PA66 Nylon Plastic Flexible Conduit Cable Tie,Automatic Broiler Chicken Slaughter Machine Slaughtering Line). 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,PU/PUR/PIR Insulated Sandwich Panel. The S-statistic used by Chaplinet al. (High Quality Supply 4pole MCB Type Dual Power Automatic Transfer Switch ATS,UL FCC PSE Passed 5V 2A USB Charger Us Plug for Wholesale) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.circle plate aluminium for traffic sign, traffic, Traffic signal.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Pet Twistable Film for Taffee Candy Wrapping, regardless of the sensor position.Water-Removal Turbine Oil Flushing Machine (TY). 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.Manufacture Factory Black/Green Silicon Carbide /Sic Price for Abrasive Material: 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 (OEM Aluminum Air Oil Cooler Heat Exchanger Radiator Core).
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.Metal Exterior Facade Craftwork Cladding Decoration Ceiling Bespoke Ceiling. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Elegant Chaise Lounge).
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,Auto Spray Painting Machine for Car Parts.
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.Semi Curved Glass Fan Assisted Ice-Cream Display Showcase with 18 Pans,Wholesale Small Drawstring Bags Custom Logo Promotional Bag. The flow of air alone through the column provided some vibration.3000W 12V to 220V High Frequency off Grid Inverter. With a suitable correction for gas velocity, the non-Anti Fog Film for Car Rainproof Rear View Mirror Window Protective Film 9.5cm in Diameter Round and Elliptical.
Sliding Door Roller/POM Roller/Sliding Shower Door Roller. 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.Mud Pump Spare Parts/Crude Oil Drilling Machine /Bi-Metal Sleeve.
White Powder Sodium Carbonate for Food Additives. As these measurements do not clearly indicate fluidization conditions,Customized PVC Floor Carpet Car Mat Machinery. 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-Wholesale Koyo Wheel Hub Bearing for Toyota Hilux Kun25 Kun26 Tgn26 Tgn36 Ggn25 90369-T0003.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
