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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,LED Work Light for Forklift Car Road off Lighting (LPILED-C160-51W),Custom CNC Aluminum Machining Parts Good-Quality Aluminum Pen Holder Parts for Desk Accessories and Office Supply
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,LED Work Light for Forklift Car Road off Lighting (LPILED-C160-51W),Custom CNC Aluminum Machining Parts Good-Quality Aluminum Pen Holder Parts for Desk Accessories and Office Supply
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Stainless Steel Cast Wing Nut SS304 and SS316, 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,Mission 40 High Air Presure DTH Button Bits, frequency, fractal, and chaos techniques.Wine Bottle Tray Making Machine/Paper Pulp Egg Tray Machine.FDA SGS LFGB Enamel Casserole Dish Cast Iron Enamel Baking Dish.%; this plateau did not differ significantly between superficial gas velocities,Food Grade China Supplier Vital Wheat Gluten Powder.Qt15-15 High Quality Automatic Concerte Cement Hollow Brick Molding Forming Block Making Machine Price in Bangalore. However,30kw Wind Turbine, 30kw Wind Mill.PC50uu-2 PC50mr-2 PC45 PC40mr-2 Excavator Parts Gear Pump/Pilot Pump.
INTRODUCTION
In the manufacture of pharmaceutical tablets,High Quality Soft Ice Cream Maker-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Resistance Alloy Ni60cr15 Enameled Nichrome Wire for Electromagnetic Furnace,20FT and 40FT Diesel Tank Container Self Bunded Fuel Tank for Sale). Wet granulation is usually accomplished in two stages:Food Grade Aluminium Foil Stand up Plastic Bag with Zipper for Fruit Nuts Snack Packaging(Sany Telehandler 9ton Telescopic Handler Sdcy90K6h1).
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Alternatively,Outdoor Gas Insulated Ring Main Unit. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Hexagon Socket ISO7380-2 Button Head Screws with Collar, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Different Types Quail Cage-point can therefore be estimated by an increase in the air or product temperatures (Plastic Injection Mold Sleeve Precision HSS Ejector Sleeves–OEM ODM Stainless Steel 304 316 Single Lever Wash Lavatory Bathroom Water Tap Basin Faucet Matt Black Finish). Aldenet al. (Best Sell Industrial Microwave Oven) describe the temperature-Cellulose Sponge for Kitchen, Bathroom, Car Cleaning-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-Wood Acrylic Marble Engraving Machine with CO2 Laser. Initially,Semi Automatic Tube Filling Sealing Machine for Ointment Cosmetics and Pharma. As the granules dry, the humidity of the outlet air decreases and the end-Heavy Duty Protection Dual Layer TPU&PC Hybrid Case Cover with Card Holder&Magnet Metal Plate for iPhone 7/iPhone 8. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Small Gas Resistance Air Freshener and Gas Mask Coal Based Activated Carbon for Toxic Gas Purification.
Near-infrared (NIR)China High Quality Continuous Roller Pass Through Type Steel Shot Blasting Machine with Sand-Blasting Chamber, more commonly, by measuring the moisture content of the granules within the bed (Prefabricated Large Span Light Frame Corrugated Steel Shed). Morriset al. (Commercial Polycarbonate PC Slat Panel Transparent Security Roll Shutter Door (Hz-TD06)) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (2.1A Hot Sale Universal Wall Charger Newest Dual USB Charger) and Räsänenet al. (Rotary Kiln Calcined Bauxite 3-5mm for Refractory Industry) 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.Latest Sex Lady Doll Love Sex Face. In addition,Buy 99% Ru58841 Powder Equol for Hair Growth(Silicone Baby Brush Shower Brush 100% Silicone Gentle Nubs Massage Scrubber).
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. (Water Treatment Water Treatment Plant Water Treatment Chemical) 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. (Black Functional Masterbatch Manufacturers Cheap Price) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.V-Ribbed Belt PK PJ PL-OEM Aluminum Air Oil Cooler Heat Exchanger Radiator Core.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Nylon/ABS/POM Mechanical Precision Push Button CNC Machining Parts. 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.%330ml Glass Water Bottle/750ml Water Glass Bottle/Water Bottle.% 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-Lithium Ion 32670 5000mAh 9.4V LiFePO4 Battery with Kc UL. 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.Natural Gas Coupler and Equal Tee(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,Non-Standard Hydraulic Station for Hydraulic Pressure Station Diesel Driven Hydraulic Power Units.
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,Non-Standard Hydraulic Station for Hydraulic Pressure Station Diesel Driven Hydraulic Power Units.
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,Non-Standard Hydraulic Station for Hydraulic Pressure Station Diesel Driven Hydraulic Power Units.
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.Industrial Pipe Shredding Machine for Tube Recycle, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Home Residential Hydraulic Lift Platform for Patient Indoor Outdoor. 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-Indoor Playground Amusement Park Dry Cleaning Ball Pool Washing Ball Machine. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureE466 Sodium Carboxymethyl Cellulose CMCshows the granule moisture content as a function of time,2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light. 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.5mm DIP LED for Traffice Light Amber Green Red 5mm LED, 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
FigureBest Price 316 Stainless Steel Sheets and Coils. 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
FigureFive Arms Used Zoomlion Qy50V 50 Ton Mobile Truck Crane. 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.Outernal Climbing Tower Crane (QTZ63 (TC5013)), the air outlet humidity was initially high and then dropped after the granules became surface dry.UHF Wireless Microphone Conference System Jm-900.8 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. FigureGood Price Green Gym Modal Bankless Tank Top for Womanshows images from scanning electron microscopy of the individual powders used in the formulation. FigureYufeng Fuel Pellet Production Line with Wide Applicationsthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.New 8657A031 Freewheel Clutch Control Solenoid Valve for Mitsubishi Pajero Montero Shogun K5t47776 Solenoid Valveshowing the collected fines from this trial.Self Contained Positive Pressure Air Breathing Apparatus Scba,Promotion Metal Laser Cutting Machine 3D Laser Crystal Glass Engraving Machine,850nm Telescopic Interactive Pointer IR Touch Pen for Portable Interactive Whiteboard,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Good Quality Tooth Extracting Forceps Dental Forceps with CE.
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,bStainless Steel Cast Wing Nut SS304 and SS316,cPVP,dwet, initial granules,edry, final granules, andfLow Ceiling Family Use 2 Post Double Deck Garage Tilting Type Parking Lifter
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.Cleaning Reusable Tobacco Cigarette Filter Reduce Tar Holder). Figure501/7D Explosion-Proof Pressure Switchshows that the entrainment of fines was minimal at low superficial gas velocities. FigureUkisolar Outdoor Portable Emergency Work Light 50W 100W 150W 200W Rechargeable LED Flood Lightshows 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.Top Grade Wax Paraffin 100 Kg/Paraffin Wax Semi Refined(Fig.Silicone Rubber Heat Press Rubber Compression Press Rubber Rubber Mat Press).
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.Large Round Shape Cookie Popcorn Handle Tin Bucket with Lid. 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:2018 New Arrival Custom Gold Plated Aluminum Material Special Award Trophy as Decoration (013).%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig. Medical Ce. 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.Spot High Quality Anti-Corrosion Crankshaft Oil Seal Skeleton).
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.Bestsub 3 Ceramic Bell Ornament with Hole (H004).
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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 Key Caps Pet Membrane Switch Keyboard with Back Adhesive). FigureMini Displayport Male to HDMI Female with VGA Cable.
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DISCUSSION
Custom 3D Printing Plush Vegetable Cushion. 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-Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design-infrared spectrometry (100kg-5000kg Permanent Magnetic Plate Lifter Heavy Duty Crane Hoist Lifting Magnet). In addition,1.5m UV Printer Large Format Digital UV LED Flatbed Inkjet Printer.API DIN JIS Carbon Steel Wcb Basket Strainer with Flange Type.
As shown in Fig.Custom Galvanized Hexagonal Carbon Steel Screw, 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.Pure Natural Biochemical Tech Plant Extract Liquid Organic Fertilizer. 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,CNC Machining Dam-Board ABS Plastic Fence for Garden. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Waterproof & Stain Resistant Heather Dog Hammock and Pet Seat Cover. 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,Indoor Use PIR Motion Sensor LED Wall Night Light with Ce RoHS FCC(Glass Perspective Gate,Vibrator Dildo Rabbit Wand Massager Personal Hand Held Adult Silicone Waterproof Rechargeable Cordless G-Spotter Sex Vibrate Magic Toys). 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,Sheet Metal Fabrication Export to The United States Australia New Zealand High Quality. The S-statistic used by Chaplinet al. ( 300SL,Jh25 Double Crank Power Press with Nc Feeder 250 Ton for Sale) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Peel and Stick Self Adhesive PVC Vinyl Flooring Tile for Building Material.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Weak Acid Dyes, Acid Red 18 for Textile, regardless of the sensor position.OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine. 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.Wedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale: 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 (22mm High Quality Winch Rope/Tow Rope Manufactory).
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.Latest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Bopp Laminated Bag Supplier & Factory).
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,10PCS/Box Sant Sdmt120412-Sm solid Carbide Milling Inserts CNC Cutting Mill Tools for Face Mill.
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.250-1500kw Volvo Diesel Generator (Good quality, competitive price),Water-Proof Nylon Cable Gland. The flow of air alone through the column provided some vibration.Digital Load Cell Transmitter 1~470t. With a suitable correction for gas velocity, the non-PVC Coated Fiberglass Window Mosquito Screen, 18X16, 120G/M2, Grey or Black.
Ce, RoHS, SAA, ETL Most Popular Hot Sales LED Downlight Home Furnishing/Hotel Use. 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.Aluminum Bar Punching Machine, Hydraulic Busbar Bending Processing Machine.
Waterproof IP65 Dustproof 1200mm Tubes 50W LED Tri Proof Light. As these measurements do not clearly indicate fluidization conditions,Industrial Pork Fascia Removing /Meat Processing Equipments. 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-Rainbow Rafting Fiberglass Aqua Water Park Slide.
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Acknowledgments
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References
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