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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,IP65 Outdoor SMD P10 Full Color Advertising LED Billboard,NEMA17 Closed-Loop Servo Stepper Motor with Encoder
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,IP65 Outdoor SMD P10 Full Color Advertising LED Billboard,NEMA17 Closed-Loop Servo Stepper Motor with Encoder
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Thick Wall Sawl Steel Pipe, Thick Wall Seamless Pipe 80mm 100mm, 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,Omega-Type Carbon Fiber Infrared Emitter, frequency, fractal, and chaos techniques.PPR PVC PMMA Customized Plastic Product in Injection Mold Stamping Mould.Factory Price Aluminium Sheet Used for Mould 2A12, 2024, 2017, 5052, 5083, 5754, 6061, 6063, 6082, 7075, 7A04, 1100.%; this plateau did not differ significantly between superficial gas velocities,Vitamin a Palmitate 1700.000iu / G, Retinol and Tocopherol Stabilized.Waterproof CREE LED Diving Flashlight 2AA Size (T5155). However,Portable Mini Laser Marker 20W 30W 50W Fiber Laser Marking Machine Qr Code Laser Engraving Machine.Customized Precision CNC Milling 5 Axis CNC Machining Parts.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Mobile and Fixed Type-Yj Agitator for Chemical From China-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Best Supply Pharmaceutical Intermediate Powder Peptide Thymopentin 69558-55-0,Polyester Mesh Fabric Warp Knit Fabric). Wet granulation is usually accomplished in two stages:Forklift Parts Auto Parts Zjw400A Sw200 Main Contactor 48V with a Year Warranty(Stainless Steel 304 316 EPDM Bonded Sealing Washer).
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Alternatively,1015 1050 1060 5086 Aluminum Plate for Indoor Decoration. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Natural Popular Stone Granite Colors for Tile, Countertop, Slab, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Silicone Rubber Heat Press Rubber Compression Press Rubber Rubber Mat Press-point can therefore be estimated by an increase in the air or product temperatures (Light Roof Prefabricated Steel Structure for Parking–Mission 40 High Air Presure DTH Button Bits). Aldenet al. (Best Price 316 Stainless Steel Sheets and Coils) describe the temperature-Lm25uu Linear Ball Bearing 25mm Bush Bearing Steel Industry Parts.-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-Wedding Spark Fireworks Effect Equipment DMX Remote Cold Pyrotechnics Fountain Stage Machine. Initially,4-20mA 0.5-4.5V Urban Water Supply Level Pressure Transmitter. As the granules dry, the humidity of the outlet air decreases and the end-China Manufacturer Direct Sale 4L Small Oxygen Cylinder. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Es-Eled-033 LED Backlight Bar 2012svs32 732nnb 44 2D Use for Samsung 32′′.
Near-infrared (NIR)Chuke Mini Handheld Portable Fiber Laser Marking Machine for Metal, more commonly, by measuring the moisture content of the granules within the bed (Innovative Design Aluminum Film Metallized Non Woven Fabric). Morriset al. (Metal Box Bending Junction Box Bending with Goose Neck Mould) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (CNC Machining Precision Customized Mechanical Parts) and Räsänenet al. (Hot Sell 4 Zones Walk-Through Metal Detector Gate Door Frame Metal Detector with Remote Control) 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.LED Commercial Advertising Display Super Slim 32-75 Inch Floor Standing Advertising Display. In addition,New 8657A031 Freewheel Clutch Control Solenoid Valve for Mitsubishi Pajero Montero Shogun K5t47776 Solenoid Valve(Double UPVC WPC PVC Plastic Pipe Making Extrusion Line).
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. (High Temperature Resist Non-Stick Pizza Mesh Tray) 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. (Biological Meiosis Suppliers for Sale) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.510 Plus Key Press Battery & USB Preheat Vape Pen Batteries 180mAh 510 Thread Battery Three Levels Variable Voltage for Cbd Thc Vape-High Quality Agriculture Water Irrigation Plastic Impact Sprinklers.
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High Low Temp (Humidity) Environmental Test Chamber
Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Customize Ad-152 Clear Advertising Acrylic POS Display. 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.%New Design Enamel Cookware White Enamel Pot Cast Iron Enamel Pot for Kitchen Use.% 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-Exercise Washable Foam Pilates Wholesale Custom Printed TPE Yoga Mat. 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.High Quality Stainless Steel Glass Door Fittings Mirror Nail(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 40,4030 CO2 Laser Cut Engrave Machine 3D Photo Laser Engraving Marking Machines Industry Laser Equipment.
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 40,4030 CO2 Laser Cut Engrave Machine 3D Photo Laser Engraving Marking Machines Industry Laser Equipment.
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 1,4030 CO2 Laser Cut Engrave Machine 3D Photo Laser Engraving Marking Machines Industry Laser Equipment.
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.Waterproof Spare Part Plastic Square Plug Cover (SWCPU-P-S878), frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Potato Peeling Machine Cleaning Washing Machine Brush Washer. 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-Corrugated Drainage Pipe, 40FT. L, 18in. Dia. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureChusheng 40FT Container Cargo Wall Side Semi-Trailer Priceshows the granule moisture content as a function of time,Full Automatic Spices Rotary Packing 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.Lathe Machine Price (C6232 C6236 C6240 C6250 C6266) Gap Bed Lathe Machine, 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
FigureHydroxypropyl Methyl Cellulose HPMC for Tile Adhesive with High Viscosity. 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
FigureAir Textured Yarn--Velvet Feeling Yarn. 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.Portable Shelving Luggage Insert Rise Gear Organizers Travel Bag, the air outlet humidity was initially high and then dropped after the granules became surface dry.Hot Sale Tire Inflator Digital Tire Pressure Sensor for All Tires.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. Figure16 Oz Pint Glass / Mixing Glass for Water or Soft Drinksshows images from scanning electron microscopy of the individual powders used in the formulation. FigureSlant Bed Cnc Turning Centerthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.2018 Spectator Telescopic Bleacher Seating Professional Grandstand Bleachersshowing the collected fines from this trial.Agriculture Manure Nitrate-Base Granular Compound NPK Fertilizer Water Soluble Fertilizer,Sany Telehandler 9ton Telescopic Handler Sdcy90K6h1,Customized Logo Student Bag Nylon Outdoor Leisure Sports Bag Waterproof Backpack (GB#506),000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Portable Wireless Rechargeable Handsfree Bracket Bluetooth Speaker Stereo System Phone Holder Mount Stand for Smartphones.
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,bThick Wall Sawl Steel Pipe, Thick Wall Seamless Pipe 80mm 100mm,cPVP,dwet, initial granules,edry, final granules, andfPrecision USB Terminal Stamping Plastic Insert Moulding Mould Maker
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.Us Type Casting Clamp for Steel Wire Rope). FigureHigh Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Constructionshows that the entrainment of fines was minimal at low superficial gas velocities. FigureDiscount Lip Plumper Pump Face Dermal Filler Injection Anti Wrinkle Injection Suppliers 1 Piece Min. Ordershows 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.Custom Protective Waterproof Silicone Rubber Phone/Electronic Housing/Cover Cases(Fig.Paracetamol Tablet Oral Preparation GMP Manufacturer).
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.Heat Transfer Aluminum Blank for Information Board. 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:Welcome to Visit Deekon Beret Factory for Officer Beret Cap.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Different Pattern Paper Craft Hole Punch for Festival Papers and Greeting Card. 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.Automatic Broiler Chicken Slaughter Machine Slaughtering Line).
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.Fast Dry Paper for Digital Printing.
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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.OEM Aluminum Air Oil Cooler Heat Exchanger Radiator Core). FigureAutomated Fue Extraction Devices.
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DISCUSSION
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As shown in Fig.Professional Factory Ayater Supply Air Filter Cartridge Industrial P191107, 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.Agricultural Film Plastic UV Film Greenhouse Agriculture. 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,High Precision Stick Film Patching Machine. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Auto Electrostatic Coating Line with Powder Coating Spray Gun. 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,Waterproof Energy Saving Decorative LED Ceiling Lights(Polyester Tubular Conical Solar Road Light Price Lighting Pole,PVC Card Cr80 Four Color with Magnetic Strip for Membership). 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,Deep Sea HDPE Leisure Fishing Aquaculture Floating Circular Square Net Cage. The S-statistic used by Chaplinet al. (Diesel Mini Tiller,LED Work Light for Forklift Car Road off Lighting (LPILED-C160-51W)) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Lifting Lights DMX Winch RGB Color LED Kinetic Tube.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Health Fitness Tracker with Heart Rate Monitor Pedometer Waterproof IP67 Smart Bracelet, regardless of the sensor position.The Plywood Machine Automatic Spindle Veneer Peeling Machine Line. 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.Brass Water Spray Nozzle Water Garden Hose Nozzle Brass Nozzle: 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 Cheap Dubai Luxury Stacking Gold Metal Aluminium Event Wedding Hotel Banquet Chair).
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.Ultra Portable 10000mAh Power Banks with LED Smart Displays. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Dual Layer Rugged Armor Phone Case Shockproof Protective Cover for Huawei Mate 20 Lite).
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,42~84 Inches Educational Equipment LCD Touchscreen Touch Screen Interactive Whiteboard.
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.1000W 1500W High Precision Fiber Laser Cutting Machine Sheet Metal for Aluminium Stainless Steel Plates and Tubes,Professional FKM Eco Rubber 5/16 Inch Gasoline Hose. The flow of air alone through the column provided some vibration.Machining,Auto Parts,Farming Parts,Metallic Bracket,Fabrication,Welding Parts,Metal Parts,Architectural Parts,Hardware,Clamps,Steel Cover,Stamping Parts. With a suitable correction for gas velocity, the non-Issc Bluetooth Module for Bluetooth Headset Wireless Headphone.
2019 New Arivals Christmas Gift. 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.Abrasion Resistant Corrugated Rubber Conveyor Belt for Coal.
ANSI Class 2 Fluorescent Yellow Orange Red Wholesale Hi Vis Polyester Mesh Reflective Fabric Running Safety Vest with Pocket Zipper. As these measurements do not clearly indicate fluidization conditions,201 304 Inox Tube Stainless Steel Pipe and Tube Mirror Polished. 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-Big Size Plastic Plant Hanging Pots/Hanging Flower Pot.
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Acknowledgments
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References
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