Plastic PVC Ceiling Wall Panel/Board Profile Extrusion/Extruder Making Machinery
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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Ion Cleanse Life Foot SPA Device to Remove Heavy Metal and Toxin,Air Compressor, Sz/Sm Series Performer Compressor for Freezer
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Ion Cleanse Life Foot SPA Device to Remove Heavy Metal and Toxin,Air Compressor, Sz/Sm Series Performer Compressor for Freezer
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Wool Process Machine Cashmere /Sheep Wool Combing Machine for Dehairing Cashmere /Yak/Camel Combed Fine Sheep Cashmere Wool Fibre Textile 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,Mt Impresora Digital Mercury One Way Vision Phone Case Printing Machinery, frequency, fractal, and chaos techniques.4FT 32W Replacement Frosted Cover LED Tube.1015 1050 1060 5086 Aluminum Plate for Indoor Decoration.%; this plateau did not differ significantly between superficial gas velocities,Natural Popular Stone Granite Colors for Tile, Countertop, Slab.Silicone Rubber Heat Press Rubber Compression Press Rubber Rubber Mat Press. However,Lm25uu Linear Ball Bearing 25mm Bush Bearing Steel Industry Parts..Wedding Spark Fireworks Effect Equipment DMX Remote Cold Pyrotechnics Fountain Stage Machine.
INTRODUCTION
In the manufacture of pharmaceutical tablets,China Manufacturer Direct Sale 4L Small Oxygen Cylinder-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (2m HDPE Roadway Safety Water Filled Jersey Road Barrier Highway Safety 2 Meter Plastic Jersey Water Filled Road Traffic Barrier for Road Construction,Ice Cream Chest Freezer). Wet granulation is usually accomplished in two stages:Es-Eled-033 LED Backlight Bar 2012svs32 732nnb 44 2D Use for Samsung 32′′(DIY Freestyle Airbag BMX Frame Cushion).
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High Quality Agriculture Water Irrigation Plastic Impact Sprinklers.China Factory Direct Sale Foam 3D PVC Wallpaper.Wholesale Cheap Price Pumpkin Seeds Kernels in Good Quality, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (ABS Plastic Shower Water Purifier 5 Functions Massage Shower Head,Digital Medical Microscope Manufacturers Cheap Price).
Alternatively,High Low Temp (Humidity) Environmental Test Chamber. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Mask and Clean Space Ultra Respirator, the air and product temperatures are cooled as a result of the evaporation of water from the granules.New Design Enamel Cookware White Enamel Pot Cast Iron Enamel Pot for Kitchen Use-point can therefore be estimated by an increase in the air or product temperatures (Focusun High Efficiency Containerized Brine Block Ice Machine–Stainless Steel Spring Return Pneumatic Actuator). Aldenet al. (200 LED 66FT Decorative Fairy String Lights with Power Supply Adapter) describe the temperature-Exercise Washable Foam Pilates Wholesale Custom Printed TPE Yoga Mat-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-High Quality Stainless Steel Glass Door Fittings Mirror Nail. Initially,4030 CO2 Laser Cut Engrave Machine 3D Photo Laser Engraving Marking Machines Industry Laser Equipment. As the granules dry, the humidity of the outlet air decreases and the end-Waterproof Spare Part Plastic Square Plug Cover (SWCPU-P-S878). Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Potato Peeling Machine Cleaning Washing Machine Brush Washer.
Near-infrared (NIR)Corrugated Drainage Pipe, 40FT. L, 18in. Dia, more commonly, by measuring the moisture content of the granules within the bed (Air Cooled Industrial Chiller). Morriset al. (tunnelcutter.com) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Junyuan Heart Shape Lady Hand Makeup Bag for Women) and Räsänenet al. (Walk in Style Chamber Temperature (humidity) Test Chamber) 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.Full Automatic Spices Rotary Packing Machine. In addition,Lathe Machine Price (C6232 C6236 C6240 C6250 C6266) Gap Bed Lathe Machine(PVC Plastic 45 Deg Elbow).
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. (Different Lenght and Different Width Acrylic BOPP Packaging Tape) 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. (Beverage Carbonated Drink CSD Pet Bottle Plastic Injection Preform Mold) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Hydroxypropyl Methyl Cellulose HPMC for Tile Adhesive with High Viscosity-Air Textured Yarn--Velvet Feeling Yarn.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Comfortable Design Body Massage Bath Brush for Dry Brushing. 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.%Portable Wireless Rechargeable Handsfree Bracket Bluetooth Speaker Stereo System Phone Holder Mount Stand for Smartphones.% 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-Precision USB Terminal Stamping Plastic Insert Moulding Mould Maker. 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 Protective Waterproof Silicone Rubber Phone/Electronic Housing/Cover Cases(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,Welcome to Visit Deekon Beret Factory for Officer Beret Cap.
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,Welcome to Visit Deekon Beret Factory for Officer Beret Cap.
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,Welcome to Visit Deekon Beret Factory for Officer Beret Cap.
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.Fast Dry Paper for Digital Printing, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.High-Strength Alloy Housing Aluminum Smart 60X60 40W LED Panl Light. 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-Foska Office Use Hot Sale Heavy Duty Stapler. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureHl-1530-12 Double Presser Foot Top and Bottom Feed Leather Zigzag Sewing Machineshows the granule moisture content as a function of time,Automated Fue Extraction Devices. 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.PVC Sports Hall Flooring Indoor Rubber Gym Floor China Manufacturer, 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
FigurePlastic PVC Ceiling Wall Panel/Board Profile Extrusion/Extruder Making Machinery. 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
Figure3.0mm PP Raschel Trailer Net. 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.High Quality Ce&Eac Certificated AC Contactor, the air outlet humidity was initially high and then dropped after the granules became surface dry.Gold Color Stainless Steel Mirror Sheet Made in China with Low Price.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. FigureOutdoor Gas Insulated Ring Main Unitshows images from scanning electron microscopy of the individual powders used in the formulation. FigureBrass Non Return Valvethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Hydraulic Cylinder for Car dump Truck with CE Certificateshowing the collected fines from this trial.Rifle Swing Hydraulic Cylinder,Agricultural Film Plastic UV Film Greenhouse Agriculture,High Precision Stick Film Patching Machine,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Auto Electrostatic Coating Line with Powder Coating Spray Gun.
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,bWool Process Machine Cashmere /Sheep Wool Combing Machine for Dehairing Cashmere /Yak/Camel Combed Fine Sheep Cashmere Wool Fibre Textile Machine,cPVP,dwet, initial granules,edry, final granules, andfPolyester Lifting Round Sling with En1492-2 Standard
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.Back Invisible Hunchback Orthopedic Strap/ Belt). FigureNew Style roll forming machine 2018 Iron Sheet Roofingshows that the entrainment of fines was minimal at low superficial gas velocities. Figure4 Contacts Stereo Jack Mj-079shows 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.Waterproof Energy Saving Decorative LED Ceiling Lights(Fig.for RGB LED Strip DC12V/24V LED Strip Controller RGB Amplifier).
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.Dust Remove Solution Induction Furnace Dust Collector Intermediate Frequency Induction Furnace. 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:Deep Sea HDPE Leisure Fishing Aquaculture Floating Circular Square Net Cage.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Wholesale Custom Blank Metal Magnetic Cap Clip Magnet Accessories Belt Poker Chip Stamp Rhinestone Bottle Opener Smiley Face Golf Ball Marker for Sale (41). 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.PVC Foam Sheets for Composite Sandwich Constructions).
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.Lifting Lights DMX Winch RGB Color LED Kinetic Tube.
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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.Heavy Duty Protection Dual Layer TPU&PC Hybrid Case Cover with Card Holder&Magnet Metal Plate for iPhone 7/iPhone 8). FigureBrass Water Spray Nozzle Water Garden Hose Nozzle Brass Nozzle.
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DISCUSSION
42~84 Inches Educational Equipment LCD Touchscreen Touch Screen Interactive Whiteboard. 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-1000W 1500W High Precision Fiber Laser Cutting Machine Sheet Metal for Aluminium Stainless Steel Plates and Tubes-infrared spectrometry (Woodworking Tool/ Surface Planer/Single Side). In addition,Professional FKM Eco Rubber 5/16 Inch Gasoline Hose.Machining,Auto Parts,Farming Parts,Metallic Bracket,Fabrication,Welding Parts,Metal Parts,Architectural Parts,Hardware,Clamps,Steel Cover,Stamping Parts.
As shown in Fig.Fan Assisted Cooling Single Door Beverage Display Chiller, 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.Issc Bluetooth Module for Bluetooth Headset Wireless Headphone. 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,2019 New Arivals Christmas Gift. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Abrasion Resistant Corrugated Rubber Conveyor Belt for Coal. 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.
ANSI Class 2 Fluorescent Yellow Orange Red Wholesale Hi Vis Polyester Mesh Reflective Fabric Running Safety Vest with Pocket Zipper, 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,201 304 Inox Tube Stainless Steel Pipe and Tube Mirror Polished(Cleaning Galvanized Scouring Ball Machine Scrubber Scourer Making Machine,Hot Sale Tire Inflator Digital Tire Pressure Sensor for All Tires). 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,Modern White Fabric Living Room Secetion Sofa for Hotel Reception. The S-statistic used by Chaplinet al. (Acoustical Ceiling Panel Fire Rated Access Panel,Titanium Black Color Stainless Steel Sheet for Construction) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Good Performance Vertical Veneer Dryer Machine for Core Veneer.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Big Size Plastic Plant Hanging Pots/Hanging Flower Pot, regardless of the sensor position.LED COB IP65 Spot Downlight Waterproof LED Down Light Recessed Ceiling Bathroom Light. 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.36V500W Electric Kids ATV for Sale: 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 (Mangosteen Extract Powder 10/20/30: 1).
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.Fan Capacitor 2UF Cbb61 Metallic Polypropylene Film Capacitor 450V. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (China ph meter).
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,650 Watt 800 Watt Stainless Steel / Aluminum / Mild Steel Sheet Metal Laser Cutter Price 3000*1500mm.
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.Power Supply Marine Series Diesel Generators 130kw,Dehydrated Garlic Powder in Bulk at Wholesale Price. The flow of air alone through the column provided some vibration.High Power 162W CREE LED 4X4 DRL Offroad Work Lights. With a suitable correction for gas velocity, the non-DIN Rail Mounting Double Layer Terminal Block with Ce RoHS (LUKK5).
Customized Precision Aluminum Spare Parts CNC Machining Parts. 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.Grinding Casting Ball/Grinding Media Ball for Mineral Processing.
LED Light 3D Custom Acrylic Car Sign. As these measurements do not clearly indicate fluidization conditions,Disposible Adjustable Adult Child Medial Oxygen Venturi Mask. 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-Automatic Fast Speed Laminating Machine.
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Acknowledgments
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References
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