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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Sell Undercarriage Parts Double Track Roller Bulldozer Bottom Roller D6h D6h XL D6h LGP,7 Wire Steel Strand for Prestressed Concrete 15.2mm
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Sell Undercarriage Parts Double Track Roller Bulldozer Bottom Roller D6h D6h XL D6h LGP,7 Wire Steel Strand for Prestressed Concrete 15.2mm
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,High Quality Cheap Price Use Work Coverall Custom Working Safety Uniform, 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,Loose Fit Ladies Fitness Jumper Multicolor Camo Crop Sports Hoodie, frequency, fractal, and chaos techniques.Simple Design Living Room Mirrored TV Cabinet.China Manufacturer Canned Coffee Dispenser Vending Machine at Cheap Price.%; this plateau did not differ significantly between superficial gas velocities,Toilet Tank Fitting for 2 Piece Ceramic.Wholesale Cake Tray Edge Folding and Making Machine. However,Desktop/ Table Type Cold Pressure Welding Machine for Copper Wires.Insect Resistant PVC Curtain for Kitchen Room.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Sinotruk HOWO Special Truck 6 Wheel 8cbm Compactor Garbage Truck-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Tire Gauge Tire Pressure Gauge Inflator,8 Inch Portable Steel Key Lock Secure Cash Box with Removable Plastic Coin Tray). Wet granulation is usually accomplished in two stages:WPC PVC Free Foam Floor Decorative Board Extrusion Production Line(3000W 12V to 220V High Frequency off Grid Inverter).
Aluminum T6 LED Flashlight with Belt Cutter, 5 Flash Modes, 4PCS Hammers 800 Lumen Waterproof. It offers several advantages, including rapid heat and mass transfer, large capacity, and relatively low capital cost (Kevlar Yarn Water-Blocking Aerial 12 Core Fiber Optic Cable ADSS,GMP Factory Supply Sterile Blended Procaine Penicilline G Hydrate Injection Powder CAS 6130-64-9).400W 15inch PA System Professional Loudspeaker, care must be taken to avoid over-Best Sell Industrial Microwave Oven, Microwave Extractor Dehydrator, leading to product loss. In order to avoid losses and poor product quality,Hot Sale Multi-Purpose Mini Electric Rotary Vane Vacuum Pump.
Brown Glass Mosaic Tiles kitchen Backsplash.Heat Sink Radiator Anodizing Aluminum Alloy Die Casting.Factory Offer Industrial Grade HPMC Powder Support Sample, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Hydraulic Oil Hydraulic Plunger Cylinder with ISO,Tungsten Carbide Drawing Dies).
Alternatively,Thermoplastic Elastomer TPE/TPU Twin Screw Extruder/Shoe Sole Pellets Making Machine. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.CNC Plasma 1530 1325 Machine Stainless Steel Router, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Milling Media Balls Alumina Ceramic Grinding Balls, Mining and Mineral Ball Mill Grinding Media-point can therefore be estimated by an increase in the air or product temperatures (PVC White BS Thread Pipe Water Supply Piping System 5.6 Metres–Recycle Wholesale Toilet Paper Toilet Tissue). Aldenet al. (Carboxymethyl Cellulose (CMC) for Food Produce) describe the temperature-China Factory Kids Toys Equipment Plastic Slide Cartoon Outdoor Playground-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-SMT Pick and Place Machine LED Mounter PCB SMT Board. Initially,New RO Water Purifier Pure Water Treatment Equipment/Automatic Reverses Osmosis RO Water Filtering System/Good Quality RO Filter for Water Purification System. As the granules dry, the humidity of the outlet air decreases and the end-Customized Forged and Cast Railway Wheel Train Parts. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-China Wholesale ODM PU Leather Crossbody Bag Shoulder Bag.
Near-infrared (NIR)Vintage Round Shape Glass Jar with Metal Cap for Honey Packing, more commonly, by measuring the moisture content of the granules within the bed (Modern Tufted Restaurant Booth Seating with Button (HD661)). Morriset al. (3D Small Night Lamp LED Desk Lamp 3D Creative Lamp LED Dormitory Lamp LED Birthday Gift LED Light Switch Control Lamp Sleep Lamp) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Intelligent Pid Temperature Controller Box for Industrial Usage Xmt-7100) and Räsänenet al. (Ce ISO Hospital Single Arm Medical Electric Endoscopic Pendant) 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.Guangzhou Factory Li-ion Cell 3.7V 2000mAh 2200mAh 2600mAh Battery 18650 Wholesale. In addition,2018 New Unique Suction Bathroom Holder Towel Ring for Home(WiFi APP Live Control Camera LED Light IP Security Hidden Camera).
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. (High Temperature and Humidity Environmental Cycle Test Chamber) 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. (Summer Breathable Sports Shoes Net Red Models Versatile Shoes Men) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Pregabalin Pharmaceutical Intermediate 99% USP-OEM Wholesale African Fashion Cotton Wax Fabric Ankara Floral Headwrap.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Toilet Tank Fitting for 2 Piece Ceramic. 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.%Fuyi Single-Cell Protein Product Separation Tubular Bowl Separator.% 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-Lifud Driver CREE LED Chip 100W COB LED Ceiling Lamp Down Lighting. 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.Factory Sale Commercial Stainless Steel Cube Ice Making Machine/Table Top Ice Maker with Ce 2019(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,Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063.
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,Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063.
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,Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063.
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.Three Phase Pfc Power Factor Correction Capacitor Bank (PFC-600kvar/400V), frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.2 Ton Electric Chain Hoist with Electric Monorail Trolley. 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-Stainless Steel/Enamel Welded Wire Mesh BBQ Grill Grates/Grid. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureCustom Connecting Fittings Type Bolt and Fastenershows the granule moisture content as a function of time,ASTM A106 Gr. B 6 Ich Sch40 Seamless Carbon Steel Pipe. 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.Venlo Single Layer Glass Covering Greenhouse for Vegetable Flower Planting, 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
FigureProfessional Factory Newest Fashion Footwear Sneaker Men′s Basketball Sports Shoes. 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
FigureMechanical Seal John Crane 2100. 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.PVC Coated Fusion Glued and Bonded Wire, the air outlet humidity was initially high and then dropped after the granules became surface dry.Automobile Electric Products Conductive Spring Sheet.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. FigureSemi Automatic Tube Filling Sealing Machine for Ointment Cosmetics and Pharmashows images from scanning electron microscopy of the individual powders used in the formulation. FigureIndustrial Desiccant Wheel Type Air Cooler and Dehumidifier Laboratorythen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Human Virgin Hair Extension Hair Bundle with Silky Straightshowing the collected fines from this trial.S11 Serie Green Sand Mixer,2019 Hot Sale Kid New Korean Version Children Princess Dress Show Shoes for Girl,Black Steel Square and Rectangular Pipe/Ms Steel Hollow Section Pipe/Black Annealed Steel Pipe,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%500W Fiber Laser Metal Steel Cutting Engraving Machine (HXB-3015).
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,bHigh Quality Cheap Price Use Work Coverall Custom Working Safety Uniform,cPVP,dwet, initial granules,edry, final granules, andfCe Approved of Professional, Supplier 1200 Degree Protective Atmosphere Heat Treatment Furnace
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.Stainless Steel 304 316 EPDM Bonded Sealing Washer). FigureFiberglass Fabric High Temperature Cloth for Saleshows that the entrainment of fines was minimal at low superficial gas velocities. FigureCheap Back Adjustable Assembly Hall Synthetic Leather Bar Stools (UL-JT822)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.High Quality Rectangle Bottle Opener Half Marathon Medal(Fig. Oil and Gas Pipeline).
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.Mission 40 High Air Presure DTH Button Bits. 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:Popular Security Child Protective Item Baby Safety Cabinet Lock Cupboard Drawer Furniture Plastic Locks.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Best Price 316 Stainless Steel Sheets and Coils. 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.Innovative Design Aluminum Film Metallized Non Woven Fabric).
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.Latest Woman Hand Bag 2018 Designer Manufacturers China.
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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.Double UPVC WPC PVC Plastic Pipe Making Extrusion Line). FigureHS-M901K Air Brush Nail Kit.
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DISCUSSION
High Precision Circle Ring Bracelet Rotary Laser Cutter with Gold Dust Recycling. 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-19mm 100% Mulberry Silk Fitted Sheet 4PCS Bedding Set Oeko-Tex100-infrared spectrometry (Customize Ad-152 Clear Advertising Acrylic POS Display). In addition,Nkis Bearing Radial Needle Roller Bearing with Inner Ring.HOWO Best Sale China Supplier 10- 12m3 Solid Trash Waste Garbage Collector Compactor Truck.
As shown in Fig. High Weather Resistant, 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.Low Price Products Vitamin a Acetate Food Additive. 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,Ice Crusher Ice Block Shaving Machine Ice Crushing Machine. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.200 150 100 75 Micron Hastelloy Sintered Wire Mesh/Metal Mesh Fabric. 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,Wholesale Bamboo Charcoal Sisal SPA Pad Shower Bath Sponge Klb-089(Facial Mask Cutting Machine,Chusheng 40FT Container Cargo Wall Side Semi-Trailer Price). 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,Home Decoration Joint Filler Glitter. The S-statistic used by Chaplinet al. (Small Portable Submersible Water Air Cooler Pump for Fountain,China Factory OEM Man Pullover Sweatshirt Wholesale Quarter Zip Pullover) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Concrete Wall Making Machine Automatic Brick Making Machine for Sale.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Horizontal Pearl Mills for Paint, Coating, Inks, Pigment Grinding, regardless of the sensor position.E466 Sodium Carboxymethyl Cellulose CMC. 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.Semi-Automatic Interlocking Brick Machine Prices for Kazakhstan/Tajikistan/Kyrgyzstan: 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 (Portable Shelving Luggage Insert Rise Gear Organizers Travel Bag).
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.Welding Sealing Double-Color Gas Cutting Flexible Air Hose for Cars. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (50% Pigment Green Color Masterbatch (G6213) for Blown Film/ Injection/ Extrusion/ Granulation).
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,Coal Mine Tear Resistant Steel Cord Conveyor Belt.
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.Newest High Precision Digital Electronic Food Kitchen Weight Scale,3000W Pipe Laser Cutter Machine for Carbon Stainless Steel. The flow of air alone through the column provided some vibration.High Quality Custom Lovely for Plush Toy Fashioplush Toy. With a suitable correction for gas velocity, the non-Battery Operated 8 Seat Golf Car with Ce.
Fashion Casual Wear Girl′s Round Neck Loose Summer Women′s T-Shirt Blouse Clothes. 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.Black and White Hand Wrapping Foil Plastic Film Rolls for Packaging.
Multi-Colour Paper Straw Making Machine (PPZG-800). As these measurements do not clearly indicate fluidization conditions,Hydraulic Power Source Stainless Steel Cookware Press Machine. 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-Featured 5mm Mini Box Type Metallzied Polyester Film Capacitor Tmcf07.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
