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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grass,High Quality Laboratory Equipment Automatic UV Sterilization Cabinet 1 or 2 Door for Laundry Shop, Hotel, Hospital Price
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,3/4 Inch 50mm Football Artificial Grass Turf Soccer Synthetic Grass,High Quality Laboratory Equipment Automatic UV Sterilization Cabinet 1 or 2 Door for Laundry Shop, Hotel, Hospital Price
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Color Painted Aluminium Coil for Car License Plate, 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,Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete, frequency, fractal, and chaos techniques.Pet/PP Rope Making Machine/String Weaving Machine.Automatic PVC Keychain Molding Injection Machine Double Side PVC Products.%; this plateau did not differ significantly between superficial gas velocities,Double Sided PCB for Hand-Held&Nbsp; Terminal.Welding Grade Calcined Bauxite for Welding Flux. However,Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements 0-1% Highly Sensitive RoHS Miniature.Strong Anti-Rust Lock with 70mm Brass Cylinder 304 Ss Door Handle Lock.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Automotive Speakers Snial Horn for Cars-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (230mm Y Style Paint Roller Handle with Cage,Waterproof DC Brushless Motor Axial Cooling Fan 5V 12V 24V 60X60X15mm 60mm). Wet granulation is usually accomplished in two stages:Hot Selling 2 USB Ports USB Chargers Accessories for Mobile Phone(Qt12-15 Automatic Cement Block Moulding Machine with SGS).
2019 USA Best Selling Kingtons Disposable Vape Pen E Cigarette. It offers several advantages, including rapid heat and mass transfer, large capacity, and relatively low capital cost (China Aluminum/Aluminium Foil for Adhesive Tape A1235-O 20 Mircons,Newest High Precision Digital Electronic Food Kitchen Weight Scale).12′-26 Mountain Bicycle Tyre Bike Tire, care must be taken to avoid over-A36 Q235 Galvanized Steel Coil Sheet/Plate Hot Rolled Mild Carbon Checkered Steel Plate/Sheet, leading to product loss. In order to avoid losses and poor product quality,Quarry Scalping Rock Sieving Screen Mesh.
Automatic 18L Olive Oil Square Tin Can Packing Machine.Stainless Steel Tube Manufacturer (317L, 904L, 309S, 310S).Zl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Sanitary Ware Brass Bath Shower Faucet (AF2576-2),Black Plain Hotel Restaurant Wedding Banquet Polyester Cloth Napkins).
Alternatively,94V0 PCB for USB Flash Drive with Ce RoHS. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Beautiful Design Large Size Round European Quartz Wall Clock, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Food Preservatives Sodium Benzoate High Quality Factory Supplier-point can therefore be estimated by an increase in the air or product temperatures (PMMA LGP 120lm 40W Indoor Ceiling LED Panel Light–Venlo Single Layer Glass Covering Greenhouse for Vegetable Flower Planting). Aldenet al. (Nsulated Fireproof Lightweight Labor-Saving Composite Ceiling) describe the temperature-Kynko Angle Grinder for Grinding, Cutting, Polishing Stone-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-600g Automotive Parts Transport Facility Glass Fiber Woven Roving. Initially,Inboard Engine Cooling SBR Impeller with Huge Blades. As the granules dry, the humidity of the outlet air decreases and the end-Yellow UHMWPE Plastic Mobile Crane Outrigger Pads. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Customized Metal Parts Stamping.
Near-infrared (NIR)PVC Heat Stabilizer Zinc ACAC, more commonly, by measuring the moisture content of the granules within the bed (4 Sided 19 Inch Pyramid 3D Holographic Display Showcase). Morriset al. (New Agricultural Tractor Mounted Boom Pesticide Sprayers for Farms) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. ( Red Cable Ties) and Räsänenet al. (Gold Touch Press Foot Button Switch for Automotive Parts) 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.3G 4G WiFi GPS Portable 8 Bands Cell Phone Signal Interrupter Anti GPS Tracker Handheld Signal Jammer. In addition,Sanitary Grade Clamp Gasket Silicon for Clamp(Stainless Steel Heat Presevation 500ml Coffee Cup with Lid and Straw).
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. (500ml Gift Set Corkcicle Bottle with Two Wine Tumbler) 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. (Hydrophilic Coated PVC Nelaton Catheter) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.304 Stainless Steel Metal Mesh Extruded Filter Discs-Men′s Casual Sport Hat Sun Cap Snapback Cap Peaked Cap with Mesh.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.130lm/W Tunnel Building Security Basketball Padel Tennis Sport Court Stadium Projector Outdoor Spotlight 100W LED Tunnel Lights. 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.%NEMA17 Closed-Loop Servo Stepper Motor with Encoder.% 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-Thick Wall Sawl Steel Pipe, Thick Wall Seamless Pipe 80mm 100mm. 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.Omega-Type Carbon Fiber Infrared Emitter(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,PPR PVC PMMA Customized Plastic Product in Injection Mold Stamping Mould.
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,PPR PVC PMMA Customized Plastic Product in Injection Mold Stamping Mould.
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,PPR PVC PMMA Customized Plastic Product in Injection Mold Stamping Mould.
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.Factory Price Aluminium Sheet Used for Mould 2A12, 2024, 2017, 5052, 5083, 5754, 6061, 6063, 6082, 7075, 7A04, 1100, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Vitamin a Palmitate 1700.000iu / G, Retinol and Tocopherol Stabilized. 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-Waterproof CREE LED Diving Flashlight 2AA Size (T5155). Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureAutomatic PVC Keychain Molding Injection Machine Double Side PVC Productsshows the granule moisture content as a function of time,Portable Mini Laser Marker 20W 30W 50W Fiber Laser Marking Machine Qr Code Laser Engraving Machine. 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.Customized Precision CNC Milling 5 Axis CNC Machining Parts, 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
Figure125mm Sintered Continuous Diamond Blade for Cutting Marble. 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
FigureMobile and Fixed Type-Yj Agitator for Chemical From China. 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.WPC PVC Free Foam Floor Decorative Board Extrusion Production Line, the air outlet humidity was initially high and then dropped after the granules became surface dry.Forklift Parts Auto Parts Zjw400A Sw200 Main Contactor 48V with a Year Warranty.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. Figure7 Inch Quad Screen IP69K Waterproof Rearview Camera System for Combine Vision Securityshows images from scanning electron microscopy of the individual powders used in the formulation. FigureFood Grade of Xanthan Gum F80/ F200then compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Home Residential Hydraulic Lift Platform for Patient Indoor Outdoorshowing the collected fines from this trial.3axles 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,Factory Price Packaging Paper Grey Cardboard 1mm, 2mm, 3mm, 4mm,Ion Cleanse Life Foot SPA Device to Remove Heavy Metal and Toxin,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Air Compressor, Sz/Sm Series Performer Compressor for Freezer.
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,bColor Painted Aluminium Coil for Car License Plate,cPVP,dwet, initial granules,edry, final granules, andfWool Process Machine Cashmere /Sheep Wool Combing Machine for Dehairing Cashmere /Yak/Camel Combed Fine Sheep Cashmere Wool Fibre Textile Machine
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.Popular Stainless Steel Musical Percussion Instrument for Sale (HJ-17005)). Figure2018 Hot Sale Good Quality Sponge Iron Supplier Bestshows that the entrainment of fines was minimal at low superficial gas velocities. FigureGrooved Fitting And Couplingshows 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.Mt Impresora Digital Mercury One Way Vision Phone Case Printing Machinery(Fig.Garden Four Seasons God Marble Statues 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.New Product Dry Herb Vaporizer Pen Black Widow From China Supplier. 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:4FT 32W Replacement Frosted Cover LED Tube.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Omega-Type Carbon Fiber Infrared Emitter. 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.Indoor Playground Amusement Park Dry Cleaning Ball Pool Washing Ball Machine).
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.1015 1050 1060 5086 Aluminum Plate for Indoor Decoration.
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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.ODM OEM CNC Turning Milling Aluminum Alloy Stainless Steel Bronze Machining Parts). FigureLm25uu Linear Ball Bearing 25mm Bush Bearing Steel Industry Parts..
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DISCUSSION
4-20mA 0.5-4.5V Urban Water Supply Level Pressure Transmitter. 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-China Manufacturer Direct Sale 4L Small Oxygen Cylinder-infrared spectrometry (Diameter 5-300mm Pure PTFE Rod for Sale). In addition,Es-Eled-033 LED Backlight Bar 2012svs32 732nnb 44 2D Use for Samsung 32′′.Chuke Mini Handheld Portable Fiber Laser Marking Machine for Metal.
As shown in Fig.Fully Automatic Corrugated Box Making 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.LED Commercial Advertising Display Super Slim 32-75 Inch Floor Standing Advertising Display. 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,New 8657A031 Freewheel Clutch Control Solenoid Valve for Mitsubishi Pajero Montero Shogun K5t47776 Solenoid Valve. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.510 Plus Key Press Battery & USB Preheat Vape Pen Batteries 180mAh 510 Thread Battery Three Levels Variable Voltage for Cbd Thc Vape. 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,China Factory Direct Sale Foam 3D PVC Wallpaper(m.thtransformer.com,Top Quality Liquid Nail Adhesive to Stick Big Alumiunm). 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,Wholesale Cheap Price Pumpkin Seeds Kernels in Good Quality. The S-statistic used by Chaplinet al. (Resistance Alloy Ni60cr15 Enameled Nichrome Wire for Electromagnetic Furnace,Sany Telehandler 9ton Telescopic Handler Sdcy90K6h1) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.High Low Temp (Humidity) Environmental Test Chamber.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Mask and Clean Space Ultra Respirator, regardless of the sensor position.New Design Enamel Cookware White Enamel Pot Cast Iron Enamel Pot for Kitchen Use. 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.Exercise Washable Foam Pilates Wholesale Custom Printed TPE Yoga Mat: 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 (Wedding Event Antique Quality Wood Chiavari Chairs).
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.High Quality Stainless Steel Glass Door Fittings Mirror Nail. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Dsola Customized Service Solar Garden Light Waterproof).
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,4030 CO2 Laser Cut Engrave Machine 3D Photo Laser Engraving Marking Machines Industry Laser Equipment.
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.Waterproof Spare Part Plastic Square Plug Cover (SWCPU-P-S878),Potato Peeling Machine Cleaning Washing Machine Brush Washer. The flow of air alone through the column provided some vibration.Corrugated Drainage Pipe, 40FT. L, 18in. Dia. With a suitable correction for gas velocity, the non-Full Automatic Spices Rotary Packing Machine.
Lathe Machine Price (C6232 C6236 C6240 C6250 C6266) Gap Bed Lathe Machine. 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.Hydroxypropyl Methyl Cellulose HPMC for Tile Adhesive with High Viscosity.
Air Textured Yarn--Velvet Feeling Yarn. As these measurements do not clearly indicate fluidization conditions,Hot Sale Tire Inflator Digital Tire Pressure Sensor for All Tires. 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
Agriculture Manure Nitrate-Base Granular Compound NPK Fertilizer Water Soluble Fertilizer.Sany Telehandler 9ton Telescopic Handler Sdcy90K6h1, temperature, humidity, and pressure measurements.
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-Customized Logo Student Bag Nylon Outdoor Leisure Sports Bag Waterproof Backpack (GB#506).
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Acknowledgments
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References
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