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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,SS304 Stainless Steel Flame Sculpture,HRB400 Deformed Steel Reabr, Construction Material Deformed Steel Bar
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,SS304 Stainless Steel Flame Sculpture,HRB400 Deformed Steel Reabr, Construction Material Deformed Steel Bar
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Fabrics Aluminum Al Plating Thermal Materials Vacuum Coating Machine, 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,Fan Assisted Cooling Curve Glass Cake Display Showcase for Cake, frequency, fractal, and chaos techniques.Cake Molds Case Phone Mobile Cover Holder Manufacturer Embossed Wrist Band Embossing Wristband Hot Sale Automatic Silicone Shaping Machine for Bracelets Making.China Low Temperature Lab Refrigerator Price.%; this plateau did not differ significantly between superficial gas velocities,0.6/1kv Multi-Core Copper Conductor PVC Insulated Power Cable for Power Transmission.Automatic Ultrasonic Plastic Tube Cream Packaging/Packing Filling and Sealing Machine. However,High Efficient Calcium Carbonate for Oil Paint Special.LED Work Light for Forklift Car Road off Lighting (LPILED-C160-51W).
INTRODUCTION
In the manufacture of pharmaceutical tablets,Stainless Steel Cast Wing Nut SS304 and SS316-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (12V5ah 12V 5ah Ytx5l-BS Outdo AGM Sealed Mf Maintenance Free Factory Activated Power Sports Starter High Performance Rechargeable Lead Acid Motorcycle Battery,2018 Mini Pineapple Shape Commercial Essential Oil Aroma Diffuser). Wet granulation is usually accomplished in two stages:Mission 40 High Air Presure DTH Button Bits(High Precision CNC Lead Pitch Ball Screw with Nut Sfur3205).
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Alternatively,High Quality Soft Ice Cream Maker. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Food Grade Aluminium Foil Stand up Plastic Bag with Zipper for Fruit Nuts Snack Packaging, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Paper UHF RFID Smart Tag Sticker in Roll for Logistics-point can therefore be estimated by an increase in the air or product temperatures (FTTH 16 Core Outdoor Terminal Box Fiber Optic Distribution Box–3.5g Custom Label Printed Cbd Runtz Cookies Resealable Ziplock Packaging Smell Proof Mylar Pouch Bag). Aldenet al. (0.6/1kv Multi-Core Copper Conductor PVC Insulated Power Cable for Power Transmission) describe the temperature-Indoor Metal Fiber Optic Optical Terminal Box FTTH DIN Rail Box with 6 LC Upc Duplex Adaptors-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-Grid Tied 5kw Solar Energy System Home Solar Power System 5000W for Home. Initially,Stainless Steel Pipe Fitting SS304 BSPT NPT Thread Screw Hex Nipple 3inch. As the granules dry, the humidity of the outlet air decreases and the end-Sun Nature Glass Bottle PVC Transparent Sticker. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-OEM High Quality Die Casting Alloy Auto Part Car Wheels.
Near-infrared (NIR)Competitive Price PTFE Fabric Glass High Temperature Teflon Coated Adhesive Sheet, more commonly, by measuring the moisture content of the granules within the bed (A1 A2 A3 Direct DTG Printer T-Shirt Printing Machine). Morriset al. (Dust Reduce Water Spray Fog Cannon) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (4-20mA 0.5-4.5V Urban Water Supply Level Pressure Transmitter) and Räsänenet al. (Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta) 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.Outdoor Gas Insulated Ring Main Unit. In addition,Hexagon Socket ISO7380-2 Button Head Screws with Collar(Good Quality Polycarbonate (PC) Plastic Board).
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. (Galvanized Iron Material British Type Hose Clamp Used for Pipe) 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. (Non Skive Hydraulic Hose Sleeves) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Different Types Quail Cage-Cellulose Sponge for Kitchen, Bathroom, Car Cleaning.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Brass Water Spray Nozzle Water Garden Hose Nozzle Brass Nozzle. 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.%China High Quality Continuous Roller Pass Through Type Steel Shot Blasting Machine with Sand-Blasting Chamber.% 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-Latest Sex Lady Doll Love Sex Face. 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.Buy 99% Ru58841 Powder Equol for Hair Growth(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,V-Ribbed Belt PK PJ PL.
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,V-Ribbed Belt PK PJ PL.
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,V-Ribbed Belt PK PJ PL.
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.OEM Aluminum Air Oil Cooler Heat Exchanger Radiator Core, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.PVC Coated Fusion Glued and Bonded Wire. 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-Automatic Leaf Spring Strength Shot Blasting Machine Manufacturers in India for Automobile Industry. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureCustomizable Decorative 3D Christmas Holiday Party Motif LED Lightshows the granule moisture content as a function of time,Wholesale Fashionable Smooth Star Cosmetic Liquid Eyeliner. 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.Multi-Function Camera WiFi IP IR Camera Waterproof Solar Panel Camera, 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
Figure330ml Glass Water Bottle/750ml Water Glass Bottle/Water Bottle. 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
FigureLithium Ion 32670 5000mAh 9.4V LiFePO4 Battery with Kc UL. 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.Welded Gabion Hot-Dipped Galvanized with Hihg Quality, the air outlet humidity was initially high and then dropped after the granules became surface dry.Natural Gas Coupler and Equal Tee.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. FigureLost Wax Casting/Investment Casting Parts Manufacture in Chinashows images from scanning electron microscopy of the individual powders used in the formulation. Figure830 Point Solderless Prototype PCB Board Kit for Arduinothen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Tent Fabric with Full Blackout Silver Coatings/Waterproofshowing the collected fines from this trial.Non-Standard Hydraulic Station for Hydraulic Pressure Station Diesel Driven Hydraulic Power Units,Industrial Pipe Shredding Machine for Tube Recycle,Home Residential Hydraulic Lift Platform for Patient Indoor Outdoor,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Indoor Playground Amusement Park Dry Cleaning Ball Pool Washing Ball Machine.
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,bFabrics Aluminum Al Plating Thermal Materials Vacuum Coating Machine,cPVP,dwet, initial granules,edry, final granules, andf2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light
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.500W Fiber Laser Metal Steel Cutting Engraving Machine (HXB-3015)). Figure230W Icon Moving Head Light Mini 7r Beam for Nightclubshows that the entrainment of fines was minimal at low superficial gas velocities. Figurewww.billowtimewatch.comshows 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.5mm DIP LED for Traffice Light Amber Green Red 5mm LED(Fig.Glass Class Silica Sand Washing Plant for Sale).
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.Double Acting Heavy Industry of Hydraulic Piston. 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:Best Price 316 Stainless Steel Sheets and Coils.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.CAS84-66-2 Diethyl Phthalate (DEP) Manufactuerf Solvent Lubricant Deodorant. 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.Home Decoration Joint Filler Glitter).
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.Five Arms Used Zoomlion Qy50V 50 Ton Mobile Truck Crane.
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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.19mm 100% Mulberry Silk Fitted Sheet 4PCS Bedding Set Oeko-Tex100). FigurePromotion Metal Laser Cutting Machine 3D Laser Crystal Glass Engraving Machine.
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DISCUSSION
Good Quality Tooth Extracting Forceps Dental Forceps with CE. 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-Low Ceiling Family Use 2 Post Double Deck Garage Tilting Type Parking Lifter-infrared spectrometry (Automatic Industrial PVC Film Die Cutting Machine for Post Printing Process). In addition,Top Grade Wax Paraffin 100 Kg/Paraffin Wax Semi Refined.2018 New Arrival Custom Gold Plated Aluminum Material Special Award Trophy as Decoration (013).
As shown in Fig.Hardest Core Medium-Speed Paper Cup Forming machine, 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.Bestsub 3 Ceramic Bell Ornament with Hole (H004). 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,Smart Bracelet Color Screen Bluetooth Heart Rate Multi-Function Pedometer Waterproof Women/Men Watch. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.4 Sided 19 Inch Pyramid 3D Holographic Display Showcase. 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,Nail Jewelry Nail Polish Glue Nail Art Necklace Korea Japan Nail Phototherapy Metal Decoration Metal Bar(Best Travel Suitcase,2019 New Arivals Christmas Gift). 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,Custom 3D Printing Plush Vegetable Cushion. The S-statistic used by Chaplinet al. (Auto Parts Engine Car Accessory Bkr6egp Spark Plugs,Fashion Designer PU Shoulder School Backpack Bag Women) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-1.5m UV Printer Large Format Digital UV LED Flatbed Inkjet Printer, regardless of the sensor position.API DIN JIS Carbon Steel Wcb Basket Strainer with Flange Type. 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.Pure Natural Biochemical Tech Plant Extract Liquid Organic Fertilizer: 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 (Playground Flooring Suspension Floor for Kindergarten Basketball Court).
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.CNC Machining Dam-Board ABS Plastic Fence for Garden. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Hanger for Cemwnt Screw Conveyor).
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,Waterproof & Stain Resistant Heather Dog Hammock and Pet Seat Cover.
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.Wholesale Blank Promotional Baseball Cap,Indoor Use PIR Motion Sensor LED Wall Night Light with Ce RoHS FCC. The flow of air alone through the column provided some vibration.Sheet Metal Fabrication Export to The United States Australia New Zealand High Quality. With a suitable correction for gas velocity, the non-Peel and Stick Self Adhesive PVC Vinyl Flooring Tile for Building Material.
Weak Acid Dyes, Acid Red 18 for Textile. 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.OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine.
Wedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale. As these measurements do not clearly indicate fluidization conditions,Latest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water. 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-Water-Proof Nylon Cable Gland.
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Acknowledgments
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References
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