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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Resuable Mannual Resuscitator Ambu Bag,Diameter 0.39mm Hot Dipped Galvanized Wire
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Resuable Mannual Resuscitator Ambu Bag,Diameter 0.39mm Hot Dipped Galvanized Wire
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,13MPa Fine Stone Electric Concrete Pump for Sale, 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,Air Conditioner Rubber Pads, frequency, fractal, and chaos techniques.Food Grade 1100 H19 Aluminum Strip Roll for Transformer Winding.Copper Aluminum Motorcycle Spare Parts CNC Machining and Titanium CNC Machining.%; this plateau did not differ significantly between superficial gas velocities,High Quality Child Book Printing Service.Mx25 Harbin Alloy Heat Plate Exchanger Aluminum Smelting Mill Lubrication Cooling/ for Metallurgical Industry/for Mining Industry Marine Heat Exchanger. However,Kampa China Supplier LC1-D032 AC Magnetic Contactor.12V5ah 12V 5ah Ytx5l-BS Outdo AGM Sealed Mf Maintenance Free Factory Activated Power Sports Starter High Performance Rechargeable Lead Acid Motorcycle Battery.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Plastic Injection Mold for Urine Cup/Two-Color Plastic Mould-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Metal Exterior Facade Craftwork Cladding Decoration Ceiling Bespoke Ceiling,1kg Portable ABC Dry Chemical Dry Powder Fire Extinguisher). Wet granulation is usually accomplished in two stages:Fire Protective Gloves, Safety Wear(Cheap Price New Products Electronic Cigarette Vape Pen E-Cigarette Kits).
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Acoustical Ceiling Panel Fire Rated Access Panel.Women Printed Leggings Slim Gym Fitness Sports Pants Push up Leggings.Custom Small Clear Acrylic Pet Bed Display Stand, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Cake Molds Case Phone Mobile Cover Holder Manufacturer Embossed Wrist Band Embossing Wristband Hot Sale Automatic Silicone Shaping Machine for Bracelets Making,R-4).
Alternatively,Customized Architectural Engineering Rubber Expansion Swell Strip. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.High Temperature and Humidity Environmental Cycle Test Chamber, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Bulk Manufacturer Food Grade Gellan Gum-point can therefore be estimated by an increase in the air or product temperatures (Battery Operated 8 Seat Golf Car with Ce–Desktop/ Table Type Cold Pressure Welding Machine for Copper Wires). Aldenet al. (Customized Waterproof Stickers Car Decals with ISO/Ts16949 Certified) describe the temperature-Exhaust Flexible Pipe with Inner Braid 1.3/4X 4-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-Factory Price Mobile Phone LCD Touch Screen for Apple iPhone 8 Plus. Initially,Aluminium Full Tension Dead End Anchoring Clamp, Anchor Clamp. As the granules dry, the humidity of the outlet air decreases and the end-Pine LVL Scaffold Plank Wood Construction Timer /Pine LVL. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Farm Use 3t/H Milk Cattle Feed Pellet Production Plant.
Near-infrared (NIR)2018 New Pet Supplier Warm Soft Canvas Flower Shape of PED Cat Dog Beds, more commonly, by measuring the moisture content of the granules within the bed (Best Price High Quality MTP Male to MTP Male Fiber Optic Trunk Cable Polarity a OM5). Morriset al. (Motorola One Hype Screen Protector) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Hospital Use Psa Oxygen Plant for Sale) and Räsänenet al. (3000W Pipe Laser Cutter Machine for Carbon Stainless Steel) 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.Stainless Steel Manual Delivery Bed. In addition,Promotion Carton Knife and Opener(2kw 3kw 3015 1530 Fiber CNC Laser Cutter/Fiber Laser Cutting Machine).
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. (Digital Load Cell Transmitter 1~470t) 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. (High Quality Export to New Zealand Plywood Meet High Standard) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Hand Operated Cast Iron Meat Tenderizer Cuber Flatten Tenderizer with Br108-Customized Name Plate Flat Embroidery Patch Letter Military Luggage Tag.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Home Textile Soft Brushed Microfiber Duvet Quilt and Comforter Set. 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.%Leather Portfolio Folder for Business Meeting Organizer.% 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-Save 70% Electric Keep 55deg. C Hot Water High Cop4.28 12kw, 19kw, 35kw, 70kw R410A Fish Pond Heater Air Heat Pump. 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.New 4mm/5mm/6mm/8mm/10mm/12mm/15mm/19mm Safety/Toughened Curved Glass(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,Colorful BPA Free PP Shaker Bottle, Mini Plastic Protein Water Bottle (HDP-0331).
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,Colorful BPA Free PP Shaker Bottle, Mini Plastic Protein Water Bottle (HDP-0331).
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,Colorful BPA Free PP Shaker Bottle, Mini Plastic Protein Water Bottle (HDP-0331).
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.Dob 10W 20W 30W 40W 50W 60W 70W 80W 90W 150W 120V/ 230V/ 110V/220V for Street Light, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.2-8line Facial Tissue Paper Converting Machine. 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 5-500ml Gift Set Corkcicle Bottle with Two Wine Tumbler. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureMx25 Harbin Alloy Heat Plate Exchanger Aluminum Smelting Mill Lubrication Cooling/ for Metallurgical Industry/for Mining Industry Marine Heat Exchangershows the granule moisture content as a function of time,Building Materials Construction Mortar & Admixtues Rdp Latex Powders. 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.2019 Security Work Uniform with Printing Police Polo Shirt, 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.
FigureHigh Quality Power Generator Europe Type 30A Plug Spare Parts. 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
FigureStainless Steel Automatic Dumpling Spring Roll Maker Making Machine. 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.Drop Forged One Way Load Buckle, the air outlet humidity was initially high and then dropped after the granules became surface dry.100% Polyester Satin Ribbon Custom Logo for Printing in Roll Rainbow Satin Ribbon Manufacture.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. FigureCustom Screwshows images from scanning electron microscopy of the individual powders used in the formulation. FigureCapsule Packing Machinethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Semi-Automatic Interlocking Brick Machine Prices for Kazakhstan/Tajikistan/Kyrgyzstanshowing the collected fines from this trial.Automatic Fire Extinguisher Filling Machine/Fire Extinguisher Refill Machine,Fast Speed Auto Feeder Fabric Laser Cutting Machine with 3 Years Warranty,Maufacturer 14PCS Combination Wrench Set,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Inositol (6556-11-2) with High Quality on Sell.
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,b13MPa Fine Stone Electric Concrete Pump for Sale,cPVP,dwet, initial granules,edry, final granules, andfPlastic Industrial Commercial Waste Recycling Crusher Machine Shredder
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.Original Weichai Engine Spare Parts 612600900162 Engine Repair Kits). FigureChilled Water Fan Coil Unit Industrial Air Cooler Industrial Air Coolershows that the entrainment of fines was minimal at low superficial gas velocities. Figure1.5L Pet Bottle OEM Low Calorie Gluten Free Aloe Vera Juice Drink with Brc FDAshows 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.Die Casting Mold Aluminum Casting Mould High Pressure Diecasting Hpdc(Fig.Industrial Custom Gt2 Gt3 Conveyor Timing Belt Rubber).
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.0.8mm Pitch Dual Housing SMT Pin Header. 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:Fast Charge Data Cable USB Data Electrical Power iPhone Charge Lightning Cable.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Simple Design Living Room Mirrored TV Cabinet. 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.Wholesale Cheap Price Pumpkin Seeds Kernels in Good Quality).
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.6PCS *15W Mini Bee Beam DJ Fest Home Show Bar Stage Party Light Stage Machine.
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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.Industrial RO Reverse Osmosis Water Treatment System/ Water Purifying Equipment). FigureOutdoor 100W/150W/200W/240W LED High Bay Lamp for Industrial/Warehouse/Workshop Lighting.
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DISCUSSION
Horizontal Storage FRP Tank Used for Above Ground and Underground. 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-Spray Dryer Price for Mini Small Lab-infrared spectrometry (Pet/PP Rope Making Machine/String Weaving Machine). In addition,Transportation Logistic Cart Hand Trolley for Supermarket, Hotel, Airport.Cast Steel Ladle High Efficiency Casting Machine Ladle for Melting.
As shown in Fig.Dehydrated Garlic Powder in Bulk at Wholesale Price, 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.Hot! ! ! Aerial Work Platform Truck Mounted Boom Lift. 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,Plastic Laundry Detergent HDPE PP Bottle Blow Molding Machine. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.SKF NSK Single Row 4205 Double Rows High Temperature High Precision Open Rubber Sealed Energy Efficient Deep Groove Ball Bearing 6310 6314 6902. 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,Gitia Eco- Friendly Environmental Waterproof Fireproof Indoor Click Spc Vinyl Flooring(Surgical Suture Bulk Raw Material of Chromic Catgut Suture USP0#,Ice Crusher Ice Block Shaving Machine Ice Crushing Machine). 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,Furniture Hardware Stamping Part Hinge Fittings (HS-FS-002). The S-statistic used by Chaplinet al. (Durable Primary School Wooden Student Desk and Plastic Chair (SF-22S),Polished 904L Decoration Stainless Steel Sheet by Cold Rolled) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Freely New Barefoot Water Skin Shoes Non Slip Aqua Socks for Beach Swim.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-ASTM A252 S355 Galvanized Spiral Steel Pipes for Water, Oil and Gas Pipeline, regardless of the sensor position.Granite Honeycomb Panel Lightweight for Exterior Wall, Curtain Panel. 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.Easy Fold & Carry Cute Animal Design PU Leather Makeup Mirror: 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 (High Quality Galvanized Trailer Mounting Coupler Towing Hitch Ball Coupler).
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.Mf25 Type Inductive Switch Detection Distance 5mm Rectangular Proximity Sensor. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Mobile Stand Alone Welding Fume Filtration Unit From Loobo Manufacture).
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,Orange Juice Film Wrapping Packing Machine Line with Wholesale Price.
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.P3.9mm High Brightness SMD RGB Hanging LED Display,Wholesale Construction Hand Tools, Brick Trowels / Plastering Trowels. The flow of air alone through the column provided some vibration.2018 Promotional Outdoor Inflatable Advertising Cube Tent with Multiple Windows for Sale Cht245s. With a suitable correction for gas velocity, the non-210ml Glass Amber Beer Bottle Manufacturer Factory Price Wholesale Supplier in China1203.
Graphite Mould for Diamond Wire Saw Segment Sintering. 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.Automotive Masking Tape Jumbo Roll High Temperature Resistant.
Supply Terbinafine HCl CAS. 78628-80-5 Terbinafine Hydrochloride Powder High Quality. As these measurements do not clearly indicate fluidization conditions,Pg56zy58 24V DC Gear Motor with Brake and Encoder. 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-Hot Sale Sequin Notebook with Lock.
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Acknowledgments
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References
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