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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Brown Glass Mosaic Tiles kitchen Backsplash,Heat Sink Radiator Anodizing Aluminum Alloy Die Casting
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Brown Glass Mosaic Tiles kitchen Backsplash,Heat Sink Radiator Anodizing Aluminum Alloy Die Casting
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Factory Offer Industrial Grade HPMC Powder Support Sample, 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,Thermoplastic Elastomer TPE/TPU Twin Screw Extruder/Shoe Sole Pellets Making Machine, frequency, fractal, and chaos techniques.CNC Plasma 1530 1325 Machine Stainless Steel Router.Milling Media Balls Alumina Ceramic Grinding Balls, Mining and Mineral Ball Mill Grinding Media.%; this plateau did not differ significantly between superficial gas velocities,China Factory Kids Toys Equipment Plastic Slide Cartoon Outdoor Playground.SMT Pick and Place Machine LED Mounter PCB SMT Board. However,New RO Water Purifier Pure Water Treatment Equipment/Automatic Reverses Osmosis RO Water Filtering System/Good Quality RO Filter for Water Purification System.Customized Forged and Cast Railway Wheel Train Parts.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Vintage Round Shape Glass Jar with Metal Cap for Honey Packing-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Wholesale Colorful Marble Candle Jar with Copper Lid,10w Wireless Battery Charger). Wet granulation is usually accomplished in two stages:Guangzhou Factory Li-ion Cell 3.7V 2000mAh 2200mAh 2600mAh Battery 18650 Wholesale(Nichrome Resistance Stranded Wire (19 multi strands)).
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Alternatively,Fuyi Single-Cell Protein Product Separation Tubular Bowl Separator. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Lifud Driver CREE LED Chip 100W COB LED Ceiling Lamp Down Lighting, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Factory Sale Commercial Stainless Steel Cube Ice Making Machine/Table Top Ice Maker with Ce 2019-point can therefore be estimated by an increase in the air or product temperatures (Top Quality Lactose CAS 63-42-3 with Factory Price–Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design). Aldenet al. (Polyester Lifting Round Sling with En1492-2 Standard) describe the temperature-Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063-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-Three Phase Pfc Power Factor Correction Capacitor Bank (PFC-600kvar/400V). Initially,2 Ton Electric Chain Hoist with Electric Monorail Trolley. As the granules dry, the humidity of the outlet air decreases and the end-Stainless Steel/Enamel Welded Wire Mesh BBQ Grill Grates/Grid. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-ASTM A106 Gr. B 6 Ich Sch40 Seamless Carbon Steel Pipe.
Near-infrared (NIR)Venlo Single Layer Glass Covering Greenhouse for Vegetable Flower Planting, more commonly, by measuring the moisture content of the granules within the bed (10PCS/Box Sant Sdmt120412-Sm solid Carbide Milling Inserts CNC Cutting Mill Tools for Face Mill). Morriset al. (Butt Weld Fitting) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Hotel Banquet Event Hall Restaurant Party Wooden Dance Floor) and Räsänenet al. (Butt Welded Reliable Quality Pex Al Pex Pipe for Cold Water) 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.Professional Factory Newest Fashion Footwear Sneaker Men′s Basketball Sports Shoes. In addition,Mechanical Seal John Crane 2100(Modern Simple Kitchen Cupboard TV Cabinet Side Table).
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. (China Metallic Processing Machinery Peeling Lathe) 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. (Decorative Paper) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Automobile Electric Products Conductive Spring Sheet-S11 Serie Green Sand Mixer.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Hot Sales Rubber Shock Absorber Motorcycle. 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.%High Quality Rectangle Bottle Opener Half Marathon Medal.% 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-Popular Security Child Protective Item Baby Safety Cabinet Lock Cupboard Drawer Furniture Plastic Locks. 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.Latest Woman Hand Bag 2018 Designer Manufacturers China(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,Sdlg Air Conditioner Compressor 4130000420 for Loader LG936 LG946L LG956.
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,Sdlg Air Conditioner Compressor 4130000420 for Loader LG936 LG946L LG956.
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,Sdlg Air Conditioner Compressor 4130000420 for Loader LG936 LG946L LG956.
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.Top Quality CAS 28319-77-9 Alpha GPC 50% Powder Price, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.HS-M901K Air Brush Nail Kit. 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-PVC Frontlit Flex Banner (LFG55/440). Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureHigh Efficient Calcium Carbonate for Oil Paint Specialshows the granule moisture content as a function of time,High Precision Circle Ring Bracelet Rotary Laser Cutter with Gold Dust Recycling. 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.19mm 100% Mulberry Silk Fitted Sheet 4PCS Bedding Set Oeko-Tex100, 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
FigureNkis Bearing Radial Needle Roller Bearing with Inner Ring. 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
FigureHOWO Best Sale China Supplier 10- 12m3 Solid Trash Waste Garbage Collector Compactor Truck. 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.Portable G45 Gas Powered New Brush Cutter, the air outlet humidity was initially high and then dropped after the granules became surface dry.Low Price Products Vitamin a Acetate Food Additive.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. FigureWelcome to Visit Deekon Beret Factory for Officer Beret Capshows images from scanning electron microscopy of the individual powders used in the formulation. FigureCheap Bar Furniture For Salethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Hot Sale Dental Consumable Materials Zirconia Blocksshowing the collected fines from this trial.Ice Crusher Ice Block Shaving Machine Ice Crushing Machine,200 150 100 75 Micron Hastelloy Sintered Wire Mesh/Metal Mesh Fabric,Dining Room Furniture Dining Set Dining Table Chair Banquet Table,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Wholesale Bamboo Charcoal Sisal SPA Pad Shower Bath Sponge Klb-089.
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,bFactory Offer Industrial Grade HPMC Powder Support Sample,cPVP,dwet, initial granules,edry, final granules, andfHome Decoration Joint Filler Glitter
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.Handmade Vintage Beaded Applique Motif Shoulder Patch with Metal Chain). FigureLaser Welding Pillow Plate for Potassium Nitrate Dimple Plateshows that the entrainment of fines was minimal at low superficial gas velocities. FigurePeptides Por-8 Ornipressin/Vasopressin/ 8-Ornithine/ 8-Ornipressin/Ornipressin Acetate CAS 3397-23-7shows 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.Concrete Wall Making Machine Automatic Brick Making Machine for Sale(Fig.Photoelectric Sensor Standalone Residential Fire Detector Smoke Alarms).
Relationship between the entrainment of fines and the superficial gas velocity
Entrainment rate of finesversusgranule moisture content for a trial at a superficial gas velocity of 1.6 m/s
Examples of the average bed pressure drop are given in Fig.High Quality Custom Plain Shirting 100% Cotton Fabric. 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:Horizontal Pearl Mills for Paint, Coating, Inks, Pigment Grinding.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Handmade Transparent Glass Dome with Wooden Base. 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.TBB Model Electric Counterbalance Stacker).
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.E466 Sodium Carboxymethyl Cellulose CMC.
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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.Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete). FigureCoal Mine Tear Resistant Steel Cord Conveyor Belt.
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DISCUSSION
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As shown in Fig.Water-Proof Nylon Cable Gland, 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.Black and White Hand Wrapping Foil Plastic Film Rolls for Packaging. 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,Multi-Colour Paper Straw Making Machine (PPZG-800). A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Hydraulic Power Source Stainless Steel Cookware Press Machine. 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.
Event Rental Stacking Tiffany Wedding Modern Clear Chiavari Chair, 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,Fresh Golden Pear Class 1 Sweet Golden Pear Organic Pear with Price(Hot Dipped Galvanized Cattle Filed Fence,16000 Liters High Pressure Water Washing Street Cleaning Truck). 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,Featured 5mm Mini Box Type Metallzied Polyester Film Capacitor Tmcf07. The S-statistic used by Chaplinet al. (Industrial 200kw Wood Pellet Burner,High Abrasion Resistant Mc3 Chromium Carbide Wear Plate) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.High Speed Steel Saw Blade for Wood, PVC, Metal.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-EPS Foam Recycling Pelleting Machine with Dryer Cutter, regardless of the sensor position.ISO 7380 Hexagon Socket Button Head Machine Screw. 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.Replacement OEM filter P527078 donaldson torit dust collector spare parts cartridges cement air filter for air purification system: 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 (Automatic 18L Olive Oil Square Tin Can Packing Machine).
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.Colorful Big Round Trampoline for Kids and Adult From Manufacturer. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Aluminum Circles For Cooking Pots).
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,Hot Dipped Galvanized 2.5mm Cut Tie Wire & Binding Wire.
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.XCMG Road Construction Machinery Xs203j 20ton Single Drum Price Road Roller Compactor Price (more models for sale),Customized Embroidery High Quality Badge. The flow of air alone through the column provided some vibration.Garden Furniturte Large Sofa Set with 10mm Half Moon Curve Flat Wicker. With a suitable correction for gas velocity, the non-Handmade Vintage Beaded Applique Motif Shoulder Patch with Metal Chain.
Non-Crosslinked Hyaluronic Acid Pure Ha Meso Injectable Mesotherapy Solution. 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.Popular Model Pistol Grip 13PCS 1/2 Air Impact Wrench Car Tool Set.
High Precision CNC Lead Pitch Ball Screw with Nut Sfur3205. As these measurements do not clearly indicate fluidization conditions,Customized Connector Flat GSM Antenna. 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-Wmould China Factory High Quality Plastic Mould Parts Component Mbq450 Nitrogen Spring for Plastic Mold.
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Acknowledgments
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References
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