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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Different Types Quail Cage,Cellulose Sponge for Kitchen, Bathroom, Car Cleaning
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Different Types Quail Cage,Cellulose Sponge for Kitchen, Bathroom, Car Cleaning
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Wood Acrylic Marble Engraving Machine with CO2 Laser, 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,Semi Automatic Tube Filling Sealing Machine for Ointment Cosmetics and Pharma, frequency, fractal, and chaos techniques.Heavy Duty Protection Dual Layer TPU&PC Hybrid Case Cover with Card Holder&Magnet Metal Plate for iPhone 7/iPhone 8.Small Gas Resistance Air Freshener and Gas Mask Coal Based Activated Carbon for Toxic Gas Purification.%; this plateau did not differ significantly between superficial gas velocities,China High Quality Continuous Roller Pass Through Type Steel Shot Blasting Machine with Sand-Blasting Chamber.Latest Sex Lady Doll Love Sex Face. However,Buy 99% Ru58841 Powder Equol for Hair Growth.V-Ribbed Belt PK PJ PL.
INTRODUCTION
In the manufacture of pharmaceutical tablets,PVC Coated Fusion Glued and Bonded Wire-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (1.8 Degree 57mm NEMA 23 Stepper Motor for CNC Router1.8 Degree 57mm NEMA 23 Stepper Motor for CNC Router,Fish Blast Freezing Machine). Wet granulation is usually accomplished in two stages:Automatic Leaf Spring Strength Shot Blasting Machine Manufacturers in India for Automobile Industry(160lm/W 1200W LED Stadium Sport High Mast Flood Light).
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Natural Gas Coupler and Equal Tee.Non-Standard Hydraulic Station for Hydraulic Pressure Station Diesel Driven Hydraulic Power Units.Industrial Pipe Shredding Machine for Tube Recycle, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Cardboard Food Packaging Carton Box with Clear PVC Window,www.gsrfid.com).
Alternatively,Home Residential Hydraulic Lift Platform for Patient Indoor Outdoor. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Indoor Playground Amusement Park Dry Cleaning Ball Pool Washing Ball Machine, the air and product temperatures are cooled as a result of the evaporation of water from the granules.2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light-point can therefore be estimated by an increase in the air or product temperatures (Best Car Spark Plug 22401-AA630 Ilfr6b for Subaru–Event Rental Stacking Tiffany Wedding Modern Clear Chiavari Chair). Aldenet al. (Double Sided PCB for Hand-Held&Nbsp; Terminal) describe the temperature-5mm DIP LED for Traffice Light Amber Green Red 5mm LED-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-Best Price 316 Stainless Steel Sheets and Coils. Initially,Five Arms Used Zoomlion Qy50V 50 Ton Mobile Truck Crane. As the granules dry, the humidity of the outlet air decreases and the end-UHF Wireless Microphone Conference System Jm-900. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Self Contained Positive Pressure Air Breathing Apparatus Scba.
Near-infrared (NIR)Promotion Metal Laser Cutting Machine 3D Laser Crystal Glass Engraving Machine, more commonly, by measuring the moisture content of the granules within the bed (Gc/C203 Brass Acorn Shaped Ground Clamps/ Grounding Rod Clamps). Morriset al. (Fiberglass Mat with Reinforced Yarn) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (China Supplier Hot Sale Food Delivery Backpack Cooler Bag) and Räsänenet al. (Shark′s Mouth Shape Stainless Steel Buckle Connect with 1.5m Webbing) 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.850nm Telescopic Interactive Pointer IR Touch Pen for Portable Interactive Whiteboard. In addition,Good Quality Tooth Extracting Forceps Dental Forceps with CE(2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds).
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. (Stainless Steel Precision Seamless Super Long Tubing) 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. (European Design Carved Head Stone) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Low Ceiling Family Use 2 Post Double Deck Garage Tilting Type Parking Lifter-Top Grade Wax Paraffin 100 Kg/Paraffin Wax Semi Refined.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Ss 304 Vacuum Virgin Coconut Oil Dehydrator Tyd. 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.%Mini Displayport Male to HDMI Female with VGA Cable.% 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-Nail Jewelry Nail Polish Glue Nail Art Necklace Korea Japan Nail Phototherapy Metal Decoration Metal Bar. 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.Custom 3D Printing Plush Vegetable Cushion(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,Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design.
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,Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design.
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,Fashion Wall Mount Makeup Mac Cosmetic Display Stand Design.
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.1.5m UV Printer Large Format Digital UV LED Flatbed Inkjet Printer, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.API DIN JIS Carbon Steel Wcb Basket Strainer with Flange Type. 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-Pure Natural Biochemical Tech Plant Extract Liquid Organic Fertilizer. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure Productive High Solid Clear Coat.shows the granule moisture content as a function of time,CNC Machining Dam-Board ABS Plastic Fence for Garden. 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.Waterproof & Stain Resistant Heather Dog Hammock and Pet Seat Cover, 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
FigureWholesale Blank Promotional Baseball Cap. 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
FigureIndoor Use PIR Motion Sensor LED Wall Night Light with Ce RoHS FCC. 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.Wholesale Virgin Material 700MB Blank CD-R with Grade a+ Quality, the air outlet humidity was initially high and then dropped after the granules became surface dry.Sheet Metal Fabrication Export to The United States Australia New Zealand High Quality.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. FigureBlack and White Hand Wrapping Foil Plastic Film Rolls for Packagingshows images from scanning electron microscopy of the individual powders used in the formulation. FigureHigh Quality Lipstick Tubthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Accordion Dust CNC Machine Bellow Coversshowing the collected fines from this trial.Peel and Stick Self Adhesive PVC Vinyl Flooring Tile for Building Material,Weak Acid Dyes, Acid Red 18 for Textile,OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Wedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale.
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,bWood Acrylic Marble Engraving Machine with CO2 Laser,cPVP,dwet, initial granules,edry, final granules, andfLatest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water
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.Keno-L102 Good Quality Hologram Strip Label Labeling Machine). FigureOEM/ODM Factory JIS-10K Cast Iron Ball Valveshows that the entrainment of fines was minimal at low superficial gas velocities. Figure1500mm LED Linear Light LED Tri-Proof Batten Tube Light IP65shows 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.10PCS/Box Sant Sdmt120412-Sm solid Carbide Milling Inserts CNC Cutting Mill Tools for Face Mill(Fig.Vertical Liquid Reciever for Refrigeration Units (ZRLC-644)).
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.Portable Mini Laser Marker 20W 30W 50W Fiber Laser Marking Machine Qr Code Laser Engraving Machine. 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:250-1500kw Volvo Diesel Generator (Good quality, competitive price).%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Precision USB Terminal Stamping Plastic Insert Moulding Mould Maker. 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.Small AC Fan Industrial Type Blower Exhaust Fan).
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.Water-Proof Nylon Cable Gland.
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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.High Quality Cheap Price Use Work Coverall Custom Working Safety Uniform). FigureCe, RoHS, SAA, ETL Most Popular Hot Sales LED Downlight Home Furnishing/Hotel Use.
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DISCUSSION
Waterproof IP65 Dustproof 1200mm Tubes 50W LED Tri Proof Light. 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-Industrial Pork Fascia Removing /Meat Processing Equipments-infrared spectrometry (China Manufacturer Supply Directly Melamine Chipboard/Particle Board/Flakeboards). In addition,American Style Disposable Round Black PP Plastic Food Box with Clear Lid.Mini Digger Hot Sale in Australia.
As shown in Fig.Flange Seamless Stainless Steel Pipe Fitting, 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.Rainbow Rafting Fiberglass Aqua Water Park Slide. 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 Hot Wire 3D Foam Cutting Machine/Sponge Cutting/Basotect Cutting. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.High Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction. 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.
125kHz Proximity Compatible Smart Card Reader, the granules were very cohesive which resulted in poor fluidization conditions of defluidized zones and channeling; the overall contact of the air with the granules was decreased and therefore the air temperature was between the wet and dry bulb temperatures. Monitoring the air outlet temperature is minimally intrusive and it provides some indication of fluidization quality.
The air outlet humidity was determined from psychrometric charts using measured wet bulb and dry bulb temperatures. Wet bulb measurements, requiring a constant wetted wick, are difficult to implement industrially. Near-infrared spectrometry can be used to measure the humidity of the air,Cardboard Food Packaging Carton Box with Clear PVC Window(Cheap Auto Label Dispensing Machine,Focusun Brine Water Block Ice Machine with Container3 Tons). 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,Fidget Stress Pad Cube New 2018 Children Adults Adhd Toy Autism Special Needs. The S-statistic used by Chaplinet al. (Witson Quad-Core Android 9.0 Car DVD GPS for Mazda 3 2010-2011 Bluetooth OBD2 Connection,Corrugated Plastic Lawn Signs) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Furyu Sleepy Cat with Wings Pillow Anime Cushion Nemuneko Plush.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Prefabricated Large Span Light Frame Corrugated Steel Shed, regardless of the sensor position.Back Invisible Hunchback Orthopedic Strap/ Belt. 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.10g Bidi SFP+ Module Wdm 1270/1330nm LC 20km Dom Module: 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 (Alstom Valve Optipow105 135 Diaphragm).
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.2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (m.yasentag.com).
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,Clear Transparent Soft Clear PVC Sheet.
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.High Quality Ce&Eac Certificated AC Contactor,Small Portable Submersible Water Air Cooler Pump for Fountain. The flow of air alone through the column provided some vibration.Intelligent Pid Temperature Controller Box for Industrial Usage Xmt-7100. With a suitable correction for gas velocity, the non-CAS: 9003-01-4 Polyacrylic Acid PAA 63%.
Clear Toughened Glass Pool Fence. 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.Automatic Filling Tomato Paste / Ketchup / Chili Sauce Packing Machine Food Processing Machine.
PVC Coated Chain Link Fence/Wire Mesh Fence. As these measurements do not clearly indicate fluidization conditions,3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grass. 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-Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete.
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Acknowledgments
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References
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