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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,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
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,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
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Mpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15, 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,Automotive Speakers Snial Horn for Cars, frequency, fractal, and chaos techniques.Hot Selling 2 USB Ports USB Chargers Accessories for Mobile Phone.2019 USA Best Selling Kingtons Disposable Vape Pen E Cigarette.%; this plateau did not differ significantly between superficial gas velocities,12′-26 Mountain Bicycle Tyre Bike Tire.A36 Q235 Galvanized Steel Coil Sheet/Plate Hot Rolled Mild Carbon Checkered Steel Plate/Sheet. However,Quarry Scalping Rock Sieving Screen Mesh.Automatic 18L Olive Oil Square Tin Can Packing Machine.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Zl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Event Wedding Aluminum Backdrop Stand,Automatic Egg Collecting Machine). Wet granulation is usually accomplished in two stages:94V0 PCB for USB Flash Drive with Ce RoHS(High Quality Wood Wool Cement Board Wall Board).
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Inboard Engine Cooling SBR Impeller with Huge Blades.Yellow UHMWPE Plastic Mobile Crane Outrigger Pads.Customized Metal Parts Stamping, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Freely New Barefoot Water Skin Shoes Non Slip Aqua Socks for Beach Swim,Custom Award Medal Manufacturer Metals Suppliers for Sale).
Alternatively,PVC Heat Stabilizer Zinc ACAC. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.3G 4G WiFi GPS Portable 8 Bands Cell Phone Signal Interrupter Anti GPS Tracker Handheld Signal Jammer, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Sanitary Grade Clamp Gasket Silicon for Clamp-point can therefore be estimated by an increase in the air or product temperatures (Luxury Brand Sunglasses Fashion Women High Quality Replica–Abrasive/ Beads/Micro Glass Beads for Road Reflective). Aldenet al. (Stainless Steel Cast Wing Nut SS304 and SS316) describe the temperature-304 Stainless Steel Metal Mesh Extruded Filter Discs-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-Men′s Casual Sport Hat Sun Cap Snapback Cap Peaked Cap with Mesh. Initially,High Quality Factory Price Glass Door Hardware Heavy Duty Patch Fitting Lock. As the granules dry, the humidity of the outlet air decreases and the end-Frog Lamp Light Emitting Diode Warning Taillight Lamp Floodlight. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Customized Design Custom Shape Metal Stamping Coins.
Near-infrared (NIR)IP65 Outdoor SMD P10 Full Color Advertising LED Billboard, more commonly, by measuring the moisture content of the granules within the bed (2′′ Inch 40~110 L/Min Local Mechanical Display Diesel Fuel Flow Meter). Morriset al. (Shanghai Ice Pop Tube Filling Sealing Machine on Sale) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Economical Custom Design PU Leather Custom Mats) and Räsänenet al. (DIN Rail Mounting Double Layer Terminal Block with Ce RoHS (LUKK5)) 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.NEMA17 Closed-Loop Servo Stepper Motor with Encoder. In addition,Thick Wall Sawl Steel Pipe, Thick Wall Seamless Pipe 80mm 100mm(Anti Fog Film for Car Rainproof Rear View Mirror Window Protective Film 9.5cm in Diameter Round and Elliptical).
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. (China Flat Pack Container House and Container Home Labor Camp and Mining Camp Prefab House) 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. (Led Display Cable) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Omega-Type Carbon Fiber Infrared Emitter-PPR PVC PMMA Customized Plastic Product in Injection Mold Stamping Mould.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Magnet or Clips LED Shelf Light Tube LED Magnet Attached to Counter Lamp Housing 02 LED Aluminum Alloy Lamp Tube with Magnet. 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.%Customized Precision CNC Milling 5 Axis CNC Machining Parts.% 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-125mm Sintered Continuous Diamond Blade for Cutting Marble. 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.Mobile and Fixed Type-Yj Agitator for Chemical From China(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,Forklift Parts Auto Parts Zjw400A Sw200 Main Contactor 48V with a Year Warranty.
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,Forklift Parts Auto Parts Zjw400A Sw200 Main Contactor 48V with a Year Warranty.
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,Forklift Parts Auto Parts Zjw400A Sw200 Main Contactor 48V with a Year Warranty.
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.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, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Factory Price Packaging Paper Grey Cardboard 1mm, 2mm, 3mm, 4mm. 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-Ion Cleanse Life Foot SPA Device to Remove Heavy Metal and Toxin. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureAir Rubber Hose for Jack Hammer/Rock Drill/Air Compressorshows the granule moisture content as a function of time,Air Compressor, Sz/Sm Series Performer Compressor for Freezer. 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.Wool Process Machine Cashmere /Sheep Wool Combing Machine for Dehairing Cashmere /Yak/Camel Combed Fine Sheep Cashmere Wool Fibre Textile 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
FigureMt Impresora Digital Mercury One Way Vision Phone Case Printing 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
Figure4FT 32W Replacement Frosted Cover LED Tube. 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.Zl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder, the air outlet humidity was initially high and then dropped after the granules became surface dry.1015 1050 1060 5086 Aluminum Plate for Indoor Decoration.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. FigureIon Cleanse Life Foot SPA Device to Remove Heavy Metal and Toxinshows images from scanning electron microscopy of the individual powders used in the formulation. Figurewww.hegxing-connector.comthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Portable Plastic Fence Reel for Electric Fence Wire/Rope-Turbo Rollershowing the collected fines from this trial.Natural Popular Stone Granite Colors for Tile, Countertop, Slab,Silicone Rubber Heat Press Rubber Compression Press Rubber Rubber Mat Press,Lm25uu Linear Ball Bearing 25mm Bush Bearing Steel Industry Parts.,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Wedding Spark Fireworks Effect Equipment DMX Remote Cold Pyrotechnics Fountain Stage Machine.
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,bMpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15,cPVP,dwet, initial granules,edry, final granules, andf4-20mA 0.5-4.5V Urban Water Supply Level Pressure Transmitter
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.Oeko-Tex Audit Promotional 100% Organic Cotton Shopping Bag). FigureShengdong 500kw Natural Gas Geerator Parts Spark Plug Mot-807bex15. Pct23shows that the entrainment of fines was minimal at low superficial gas velocities. FigureWafer Lug Type Butterfly Valve Pn16/Pn40shows 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.China Manufacturer Direct Sale 4L Small Oxygen Cylinder(Fig.Factory Price Pre Galvanized Steel Pipe Electrical Cable Conduit).
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 Insulation IXPE Foam XPE Foam Material. 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:Es-Eled-033 LED Backlight Bar 2012svs32 732nnb 44 2D Use for Samsung 32′′.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.13MPa Fine Stone Electric Concrete Pump for Sale. 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.Vacuum High Viscosity Paste Mixer Machines High Viscosity Mixer).
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.Chuke Mini Handheld Portable Fiber Laser Marking Machine for Metal.
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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.Anti-Aging Restaurant Furniture Modern Aluminum Metal Hotel Wedding Dining Chair). Figure510 Plus Key Press Battery & USB Preheat Vape Pen Batteries 180mAh 510 Thread Battery Three Levels Variable Voltage for Cbd Thc Vape.
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DISCUSSION
China Factory Direct Sale Foam 3D PVC Wallpaper. 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-Wholesale Cheap Price Pumpkin Seeds Kernels in Good Quality-infrared spectrometry (Commercial Bakery Conveyor Pizza Baking Oven). In addition,High Low Temp (Humidity) Environmental Test Chamber.Mask and Clean Space Ultra Respirator.
As shown in Fig.Plastic Touch Screen Door Exit Push Release Button Switch, 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.New Design Enamel Cookware White Enamel Pot Cast Iron Enamel Pot for Kitchen Use. 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,Exercise Washable Foam Pilates Wholesale Custom Printed TPE Yoga Mat. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.High Quality Stainless Steel Glass Door Fittings Mirror Nail. 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 Spare Part Plastic Square Plug Cover (SWCPU-P-S878)(Aws A5.20 E71t-1 Flux Cored Welding Wire for Mild Steel,Food Grade China Supplier Vital Wheat Gluten Powder). 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,Potato Peeling Machine Cleaning Washing Machine Brush Washer. The S-statistic used by Chaplinet al. (Lymphedema Lymphatic Drainage Machine Approved by FDA Ce for People Who Suffer From Venous Problem,Fabrics Aluminum Al Plating Thermal Materials Vacuum Coating Machine) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Corrugated Drainage Pipe, 40FT. L, 18in. Dia.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Full Automatic Spices Rotary Packing Machine, regardless of the sensor position.Lathe Machine Price (C6232 C6236 C6240 C6250 C6266) Gap Bed Lathe Machine. 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.Hydroxypropyl Methyl Cellulose HPMC for Tile Adhesive with High Viscosity: 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 (The Plywood Machine Automatic Spindle Veneer Peeling Machine Line).
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.Air Textured Yarn--Velvet Feeling Yarn. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Foldable Scooter Electric).
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,Hot Sale Tire Inflator Digital Tire Pressure Sensor for All Tires.
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.Agriculture Manure Nitrate-Base Granular Compound NPK Fertilizer Water Soluble Fertilizer,Sany Telehandler 9ton Telescopic Handler Sdcy90K6h1. The flow of air alone through the column provided some vibration.Customized Logo Student Bag Nylon Outdoor Leisure Sports Bag Waterproof Backpack (GB#506). With a suitable correction for gas velocity, the non-Portable Wireless Rechargeable Handsfree Bracket Bluetooth Speaker Stereo System Phone Holder Mount Stand for Smartphones.
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Welcome to Visit Deekon Beret Factory for Officer Beret Cap. As these measurements do not clearly indicate fluidization conditions,Fast Dry Paper for Digital Printing. 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-Automated Fue Extraction Devices.
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
