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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,PVC Foam Sheets for Composite Sandwich Constructions,Factory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,PVC Foam Sheets for Composite Sandwich Constructions,Factory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Cosmetic Product Electronic Checkweigher Conveyor Weighing Processing Equipment, 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,2 Inch Agricultural Irrigation Honda Engine Gasoline Water Pump (WP20/WP50), frequency, fractal, and chaos techniques.Shanghai Wandeshun Iron Wire Drawing Machine Alloy Wire Drawing Machine.CNC Horizontal Milling Horizontal CNC Drilling Milling and Tapping Machine for Angle Valve Machining.%; this plateau did not differ significantly between superficial gas velocities,12124075 Brass Crimp Termian of Assembly Auto Delphi Wire Harness.Deformed Steel Rebar Round Bar Reinforcing Iron Metal Bar. However,Customized LC/Sc/FC/St/Lsh Singlemode Fixed Flanged Adapter Type Female to Female FC 5dB Fiber Optic Attenuator.UL FCC PSE Passed 5V 2A USB Charger Us Plug for Wholesale.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Tray Type Activated Carbon Air Filter-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Rectangular Air Pipe Sheet Pneumatic Duct Bending Machine for Sale,Anti-Metal Nfc Tag Suppliers for Sale). Wet granulation is usually accomplished in two stages:Plastic Touch Screen Door Exit Push Release Button Switch(ANSI Class 2 Fluorescent Yellow Orange Red Wholesale Hi Vis Polyester Mesh Reflective Fabric Running Safety Vest with Pocket Zipper).
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Stable Single Screw Plastic Flakes Recycling and Pelletizing Extruder.Commercial Bakery Conveyor Pizza Baking Oven.Excellent Design Long Life Span Metal Building Construction, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (China Factory Customized Precision Optical Lens,www.bobhouseware.com).
Alternatively,Road Black or Red Belgium Rubber Speed Cushion/Speed Cushion. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Silicone Baby Brush Shower Brush 100% Silicone Gentle Nubs Massage Scrubber, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Energy Efficient PE Water Gas Supply Pipe Extruder Machine PE Pipe Production Line-point can therefore be estimated by an increase in the air or product temperatures (Chain Sprocket Transmission Gear (06B–20d Interlock TPU Bonding Fabric 100% Polyester Tight Knit 44 Gauge Lining Cloth). Aldenet al. (Pg56zy58 24V DC Gear Motor with Brake and Encoder) describe the temperature-Lyz-5120 120W 8 Aluminium Outdoor Column Speaker Series-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-Wholesale Price Colled Rolled ASTM / AISI / SUS / GB / DIN / JIS 904L Super Mirror Stainless Steel Sheet. Initially,Free Sample Hardfaced Flux Cored Weld Wire for Overlap Welding. As the granules dry, the humidity of the outlet air decreases and the end-Sell Undercarriage Parts Double Track Roller Bulldozer Bottom Roller D6h D6h XL D6h LGP. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-7 Wire Steel Strand for Prestressed Concrete 15.2mm.
Near-infrared (NIR)High Quality Cheap Price Use Work Coverall Custom Working Safety Uniform, more commonly, by measuring the moisture content of the granules within the bed (Chuke Mini Handheld Portable Fiber Laser Marking Machine for Metal). Morriset al. (Electric Car on Board Battery Chargers 3.3kw with 12V Power Supply) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Factory Direct Handmade Manufacturer Custom Embroidery Badge Iron on Patches for Hat) and Räsänenet al. (65ml Square Glass Jar with Lug Cap for Food Packing) 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.Loose Fit Ladies Fitness Jumper Multicolor Camo Crop Sports Hoodie. In addition,Simple Design Living Room Mirrored TV Cabinet(2018 New Pet Supplier Warm Soft Canvas Flower Shape of PED Cat Dog Beds).
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. (Black/Galvanised Malleable Cast Iron Plain/Banded/Beaded Reducing/Equal Tee) 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. (Abstract Flower Oil Painting Wall Art) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.China Manufacturer Canned Coffee Dispenser Vending Machine at Cheap Price-Toilet Tank Fitting for 2 Piece Ceramic.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Wholesale 5 Stage Mineral Water Purifier Machine. 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
Air Cooler/Evaporative Air Cooler
Placebo granules consisting of 87 wt.% (on a dry basis) lactose monohydrate, 10 wt.%Sinotruk HOWO Special Truck 6 Wheel 8cbm Compactor Garbage Truck.% 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-WPC PVC Free Foam Floor Decorative Board Extrusion Production Line. 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.Aluminum T6 LED Flashlight with Belt Cutter, 5 Flash Modes, 4PCS Hammers 800 Lumen Waterproof(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 40,400W 15inch PA System Professional Loudspeaker.
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 40,400W 15inch PA System Professional Loudspeaker.
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 1,400W 15inch PA System Professional Loudspeaker.
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.Best Sell Industrial Microwave Oven, Microwave Extractor Dehydrator, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Hot Sale Multi-Purpose Mini Electric Rotary Vane Vacuum Pump. 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-Brown Glass Mosaic Tiles kitchen Backsplash. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureScrap Iron Electric Induction Melting Furnace (GW-1T)shows the granule moisture content as a function of time,Heat Sink Radiator Anodizing Aluminum Alloy Die Casting. 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.Factory Offer Industrial Grade HPMC Powder Support Sample, 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
FigureThermoplastic Elastomer TPE/TPU Twin Screw Extruder/Shoe Sole Pellets Making 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
FigureCNC Plasma 1530 1325 Machine Stainless Steel Router. 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.Hot Sale Medical Pad Packaging Machine, the air outlet humidity was initially high and then dropped after the granules became surface dry.Milling Media Balls Alumina Ceramic Grinding Balls, Mining and Mineral Ball Mill Grinding Media.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. Figure 200kVA)shows images from scanning electron microscopy of the individual powders used in the formulation. FigureEvent Hotel Chairthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig. Inksshowing the collected fines from this trial.China Factory Kids Toys Equipment Plastic Slide Cartoon Outdoor Playground,SMT Pick and Place Machine LED Mounter PCB SMT Board,New RO Water Purifier Pure Water Treatment Equipment/Automatic Reverses Osmosis RO Water Filtering System/Good Quality RO Filter for Water Purification System,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Customized Forged and Cast Railway Wheel Train Parts.
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,bCosmetic Product Electronic Checkweigher Conveyor Weighing Processing Equipment,cPVP,dwet, initial granules,edry, final granules, andfChina Wholesale ODM PU Leather Crossbody Bag Shoulder Bag
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.Professional Cardboard Paper Jewelry Gift Packaging Box for Wedding). FigureCNC Lathe Turning Part Aluminum Automatic Equipment Pressure Machining Componentshows that the entrainment of fines was minimal at low superficial gas velocities. FigureEas Am Detectorshows 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.Vintage Round Shape Glass Jar with Metal Cap for Honey Packing(Fig.5mm DIP LED for Traffice Light Amber Green Red 5mm LED).
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. Retinol and Tocopherol Stabilized. 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:Guangzhou Factory Li-ion Cell 3.7V 2000mAh 2200mAh 2600mAh Battery 18650 Wholesale.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Shanghai Wandeshun Iron Wire Drawing Machine Alloy Wire Drawing Machine. 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.NEMA17 Closed-Loop Servo Stepper Motor with Encoder).
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.2018 New Unique Suction Bathroom Holder Towel Ring for Home.
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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.Fireproof and Waterproof Thermal Insulation Fiber Cement Board). FigureWaterproof Home Coil Door Mat Anti-Slip Shoe Cleaning PVC Door Mat.
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DISCUSSION
Mill Finished 3003 1100 Aluminum Aluminium Coil for Insulation Industry. 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-9oz 12oz 16 Oz Stainless Steel Insulated Coffee Mug Double Layer Swig Eggshell Cup with Handle-infrared spectrometry (St Fiber Optic Standard Adapter Optical Test Equipment). In addition,Fuyi Single-Cell Protein Product Separation Tubular Bowl Separator.Lifud Driver CREE LED Chip 100W COB LED Ceiling Lamp Down Lighting.
As shown in Fig.Luxury Designer Boots Brand Lady High Heel Shoes, 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.Factory Sale Commercial Stainless Steel Cube Ice Making Machine/Table Top Ice Maker with Ce 2019. 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,Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Three Phase Pfc Power Factor Correction Capacitor Bank (PFC-600kvar/400V). 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,Stainless Steel/Enamel Welded Wire Mesh BBQ Grill Grates/Grid(Outdoor Waterproof 30LED Santa Claus LED Light String,CAS: 9003-01-4 Polyacrylic Acid PAA 63%). 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,ASTM A106 Gr. B 6 Ich Sch40 Seamless Carbon Steel Pipe. The S-statistic used by Chaplinet al. (Colorful Cotton Floss Thread for Cross Stitch,Fast Obvious 4 in 1 Cavitation Vacuum Liposuction Machine (VS-101)) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Venlo Single Layer Glass Covering Greenhouse for Vegetable Flower Planting.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Professional Factory Newest Fashion Footwear Sneaker Men′s Basketball Sports Shoes, regardless of the sensor position.Mechanical Seal John Crane 2100. 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.Automobile Electric Products Conductive Spring Sheet: 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 (Stainless Steel Wire Rope Thimble).
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.S11 Serie Green Sand Mixer. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Air Cargo Transportation).
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,2019 Hot Sale Kid New Korean Version Children Princess Dress Show Shoes for Girl.
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.Black Steel Square and Rectangular Pipe/Ms Steel Hollow Section Pipe/Black Annealed Steel Pipe,500W Fiber Laser Metal Steel Cutting Engraving Machine (HXB-3015). The flow of air alone through the column provided some vibration.Ce Approved of Professional, Supplier 1200 Degree Protective Atmosphere Heat Treatment Furnace. With a suitable correction for gas velocity, the non-High Quality Rectangle Bottle Opener Half Marathon Medal.
Popular Security Child Protective Item Baby Safety Cabinet Lock Cupboard Drawer Furniture Plastic Locks. 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.Latest Woman Hand Bag 2018 Designer Manufacturers China.
Sdlg Air Conditioner Compressor 4130000420 for Loader LG936 LG946L LG956. As these measurements do not clearly indicate fluidization conditions,Top Quality CAS 28319-77-9 Alpha GPC 50% Powder Price. 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-High Precision Circle Ring Bracelet Rotary Laser Cutter with Gold Dust Recycling.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
