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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete,Pet/PP Rope Making Machine/String Weaving Machine
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete,Pet/PP Rope Making Machine/String Weaving Machine
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Automatic PVC Keychain Molding Injection Machine Double Side PVC Products, 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,Double Sided PCB for Hand-Held&Nbsp; Terminal, frequency, fractal, and chaos techniques.Welding Grade Calcined Bauxite for Welding Flux.Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements 0-1% Highly Sensitive RoHS Miniature.%; this plateau did not differ significantly between superficial gas velocities,Strong Anti-Rust Lock with 70mm Brass Cylinder 304 Ss Door Handle Lock.Mpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15. However,Automotive Speakers Snial Horn for Cars.Hot Selling 2 USB Ports USB Chargers Accessories for Mobile Phone.
INTRODUCTION
In the manufacture of pharmaceutical tablets,12′-26 Mountain Bicycle Tyre Bike Tire-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (New RO Water Purifier Pure Water Treatment Equipment/Automatic Reverses Osmosis RO Water Filtering System/Good Quality RO Filter for Water Purification System,1kg Automatic Corn Rice Yam Flour Powder Packaging Packing Machine). Wet granulation is usually accomplished in two stages:A36 Q235 Galvanized Steel Coil Sheet/Plate Hot Rolled Mild Carbon Checkered Steel Plate/Sheet(Veterinary Esu Unit/Diathermy Machine Veterinary Electrosurgical Unit).
Quarry Scalping Rock Sieving Screen Mesh. It offers several advantages, including rapid heat and mass transfer, large capacity, and relatively low capital cost (Stainless Steel Screw/ Chipboard Screw,Agricultural Film Plastic UV Film Greenhouse Agriculture).Automatic 18L Olive Oil Square Tin Can Packing Machine, care must be taken to avoid over-Stainless Steel Tube Manufacturer (317L, 904L, 309S, 310S), leading to product loss. In order to avoid losses and poor product quality,Zl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder.
94V0 PCB for USB Flash Drive with Ce RoHS.Beautiful Design Large Size Round European Quartz Wall Clock.Food Preservatives Sodium Benzoate High Quality Factory Supplier, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Thermal Materials Rock Wool Pipe,Cotton Made Twill Pants for Boys).
Alternatively,Kynko Angle Grinder for Grinding, Cutting, Polishing Stone. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.600g Automotive Parts Transport Facility Glass Fiber Woven Roving, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Inboard Engine Cooling SBR Impeller with Huge Blades-point can therefore be estimated by an increase in the air or product temperatures (Modular Home for Accommodation Solution–Food Additives D-Tartaric Acid Bp Standard as Acidity Regulator). Aldenet al. (LED Commercial Advertising Display Super Slim 32-75 Inch Floor Standing Advertising Display) describe the temperature-Yellow UHMWPE Plastic Mobile Crane Outrigger Pads-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-Customized Metal Parts Stamping. Initially,PVC Heat Stabilizer Zinc ACAC. As the granules dry, the humidity of the outlet air decreases and the end-3G 4G WiFi GPS Portable 8 Bands Cell Phone Signal Interrupter Anti GPS Tracker Handheld Signal Jammer. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Sanitary Grade Clamp Gasket Silicon for Clamp.
Near-infrared (NIR)304 Stainless Steel Metal Mesh Extruded Filter Discs, more commonly, by measuring the moisture content of the granules within the bed (2019 Security Work Uniform with Printing Police Polo Shirt). Morriset al. (Circumcision Procedure Pack) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (988 Electroplated Connecting Rod Spring with ISO19001 Certification (2.0)) and Räsänenet al. (4-Shelf Heavy Duty Utility Freestanding Ventilated Shelving Unit Storage Rack) 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.Men′s Casual Sport Hat Sun Cap Snapback Cap Peaked Cap with Mesh. In addition,High Quality Factory Price Glass Door Hardware Heavy Duty Patch Fitting Lock(Promotion Gift Custom Silicone Rubber Soft PVC Bracelet Wristband).
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. (Brass Nipple of Screw Fittings for Nickle-Plated) 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. (New Design Nylon Adjustable Printing Martingale Dog Collar) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Frog Lamp Light Emitting Diode Warning Taillight Lamp Floodlight-Customized Design Custom Shape Metal Stamping Coins.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Rsbm Excavator Bucket Excavator Part for Sorting. 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.%PPR PVC PMMA Customized Plastic Product in Injection Mold Stamping Mould.% 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-Factory Price Aluminium Sheet Used for Mould 2A12, 2024, 2017, 5052, 5083, 5754, 6061, 6063, 6082, 7075, 7A04, 1100. 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.Vitamin a Palmitate 1700.000iu / G, Retinol and Tocopherol Stabilized(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,Waterproof CREE LED Diving Flashlight 2AA Size (T5155).
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,Waterproof CREE LED Diving Flashlight 2AA Size (T5155).
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,Waterproof CREE LED Diving Flashlight 2AA Size (T5155).
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.Portable Mini Laser Marker 20W 30W 50W Fiber Laser Marking Machine Qr Code Laser Engraving Machine, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Customized Precision CNC Milling 5 Axis CNC Machining Parts. 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 5-125mm Sintered Continuous Diamond Blade for Cutting Marble. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureISO 13485 Medical Disposable ECG Clamp Electrodeshows the granule moisture content as a function of time,Mobile and Fixed Type-Yj Agitator for Chemical From China. 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.Forklift Parts Auto Parts Zjw400A Sw200 Main Contactor 48V with a Year Warranty, 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
Figure3axles 58.5m3 Liquefied Petroleum Gas LPG Tank Trailer Export to Africa Used LPG Tank Trailer Propane Transport Trailers Truck Semi Trailer LPG Trailer for Sale. 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
FigureFactory Price Packaging Paper Grey Cardboard 1mm, 2mm, 3mm, 4mm. 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.100% Polyester Satin Ribbon Custom Logo for Printing in Roll Rainbow Satin Ribbon Manufacture, the air outlet humidity was initially high and then dropped after the granules became surface dry.Ion Cleanse Life Foot SPA Device to Remove Heavy Metal and Toxin.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. FigureDJ Lighting LED Dance Floor for Wedding Eventshows images from scanning electron microscopy of the individual powders used in the formulation. FigureSilicone Baby Brushthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Number Fruits Wooden Puzzle Toys Intelligence Developmental Educational Toysshowing the collected fines from this trial.Air Compressor, Sz/Sm Series Performer Compressor for Freezer,Wool Process Machine Cashmere /Sheep Wool Combing Machine for Dehairing Cashmere /Yak/Camel Combed Fine Sheep Cashmere Wool Fibre Textile Machine,Mt Impresora Digital Mercury One Way Vision Phone Case Printing Machinery,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%4FT 32W Replacement Frosted Cover LED Tube.
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,bAutomatic PVC Keychain Molding Injection Machine Double Side PVC Products,cPVP,dwet, initial granules,edry, final granules, andf1015 1050 1060 5086 Aluminum Plate for Indoor Decoration
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.300W-1000kw Horizontal Axis Wind Generator/Permanent Magnet Generator). FigureTop Furniture Hotel Furniture Iron / Aluminium Banquette Seatingshows that the entrainment of fines was minimal at low superficial gas velocities. FigureRubber Kneading Machine X (S) N-75 Dispersion Kneadershows 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.Natural Popular Stone Granite Colors for Tile, Countertop, Slab(Fig.Multi Span Plastic Film Tunnel Greenhouse for Planting Flowers).
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.DIY Fully Diamond Painting Embroidery Famous Car Zmc006. 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:Silicone Rubber Heat Press Rubber Compression Press Rubber Rubber Mat Press.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Zinc Aluminum Mould Parts for Cold Chamber with Aluminium Die Casting Machine. The profiles are scattered above a granule moisture content of 17 wt.% reflecting the difficulties in fluidizing these very wet granules. Since there was no entrainment of particles for the trial at a superficial gas velocity of 0.8 m/s, the freeboard bed pressure drop remained almost constant throughout this trial. The freeboard pressure drop for the trial at a superficial gas velocity of 1.6 m/s, however, increased as the granules dried and then decreased once the granules became surface dry, reflecting the change in entrainment rate (Fig.1220*2440mm High Quality UV Sheet PVC Panel Marble Board).
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.Lm25uu Linear Ball Bearing 25mm Bush Bearing Steel Industry Parts..
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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.Cast Steel Ladle High Efficiency Casting Machine Ladle for Melting). FigureChina Manufacturer Direct Sale 4L Small Oxygen Cylinder.
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DISCUSSION
Chuke Mini Handheld Portable Fiber Laser Marking Machine for Metal. 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-LED Commercial Advertising Display Super Slim 32-75 Inch Floor Standing Advertising Display-infrared spectrometry (No Toxicant Non Stick Fiberglass Mesh BBQ Grill Mat PTFE Net). In addition,New 8657A031 Freewheel Clutch Control Solenoid Valve for Mitsubishi Pajero Montero Shogun K5t47776 Solenoid Valve.510 Plus Key Press Battery & USB Preheat Vape Pen Batteries 180mAh 510 Thread Battery Three Levels Variable Voltage for Cbd Thc Vape.
As shown in Fig.All in One Medical Portable Medical HD Endoscope Camera for Sale, 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.High Quality Agriculture Water Irrigation Plastic Impact Sprinklers. 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,China Factory Direct Sale Foam 3D PVC Wallpaper. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Wholesale Cheap Price Pumpkin Seeds Kernels in Good Quality. 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.
High Low Temp (Humidity) Environmental Test Chamber, 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,Mask and Clean Space Ultra Respirator(Pepper Powder Pouch Packing Machine,Stainless Steel/Enamel Welded Wire Mesh BBQ Grill Grates/Grid). 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,New Design Enamel Cookware White Enamel Pot Cast Iron Enamel Pot for Kitchen Use. The S-statistic used by Chaplinet al. ( Mirror,4inch 150lbs CF8 Gate Valve) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Exercise Washable Foam Pilates Wholesale Custom Printed TPE Yoga Mat.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-High Quality Stainless Steel Glass Door Fittings Mirror Nail, regardless of the sensor position.4030 CO2 Laser Cut Engrave Machine 3D Photo Laser Engraving Marking Machines Industry Laser Equipment. 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.Waterproof Spare Part Plastic Square Plug Cover (SWCPU-P-S878): 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 (Wholesale Cake Tray Edge Folding and Making Machine).
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.Potato Peeling Machine Cleaning Washing Machine Brush Washer. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (2pfg 1169 pv cable).
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,Corrugated Drainage Pipe, 40FT. L, 18in. Dia.
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.Full Automatic Spices Rotary Packing Machine,Lathe Machine Price (C6232 C6236 C6240 C6250 C6266) Gap Bed Lathe Machine. The flow of air alone through the column provided some vibration.Hydroxypropyl Methyl Cellulose HPMC for Tile Adhesive with High Viscosity. With a suitable correction for gas velocity, the non-Air Textured Yarn--Velvet Feeling Yarn.
Hot Sale Tire Inflator Digital Tire Pressure Sensor for All Tires. 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.Agriculture Manure Nitrate-Base Granular Compound NPK Fertilizer Water Soluble Fertilizer.
Sany Telehandler 9ton Telescopic Handler Sdcy90K6h1. As these measurements do not clearly indicate fluidization conditions,Customized Logo Student Bag Nylon Outdoor Leisure Sports Bag Waterproof Backpack (GB#506). 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-Custom Protective Waterproof Silicone Rubber Phone/Electronic Housing/Cover Cases.
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Acknowledgments
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References
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