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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Hardest Core Medium-Speed Paper Cup Forming machine,90ml Modern Clear Glass Perfume Botle Cosmetic Packing Bottle
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Hardest Core Medium-Speed Paper Cup Forming machine,90ml Modern Clear Glass Perfume Botle Cosmetic Packing Bottle
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Piston Hand-Held Rock Splitter Equipment, 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,Electricity Strain Composite Silicone Suspension Rod Insulator, frequency, fractal, and chaos techniques.Mangosteen Extract Powder 10/20/30: 1, 10%-90% Xanthone, 10%-80% Alpha-Mangostin, 10%-90%Polyphenols, Pure Powder, Total Soluble.Durable Primary School Wooden Student Desk and Plastic Chair (SF-22S).%; this plateau did not differ significantly between superficial gas velocities,Walk in Style Chamber Temperature (humidity) Test Chamber.Tell World China Supply Square 8 Seat Restaurant Dining Table. However,Factory Price Hot Rolled Forget Steel Bar SAE 1045 4140 4340 8620 8640 Alloy Steel Round Bars.Custom Screw, Shoulder Bolt, Double Head Threaded Screw, Drive Bolt.
INTRODUCTION
In the manufacture of pharmaceutical tablets,UL Certificate LED Bathroom Wall Mirror with Touch Switch-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Butt Welded Reliable Quality Pex Al Pex Pipe for Cold Water,Aluminium Coating Production Line for Vehicles). Wet granulation is usually accomplished in two stages:10-100mm RoHS VW-1 Heat Shrink Tube Forpower Insulation(Modern Simple Kitchen Cupboard TV Cabinet Side Table).
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Alternatively,Factory Price Pre Galvanized Steel Pipe Electrical Cable Conduit. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.TBB Model Electric Counterbalance Stacker, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Water Softener Underground Water Treatment Alkaline Water Industrial Filter Machine-point can therefore be estimated by an increase in the air or product temperatures (High Efficient Calcium Carbonate for Oil Paint Special–50 Inch Insert or Embedded or Built-in Wall Electric Fireplace with Remote Control). Aldenet al. (Computerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH)) describe the temperature-99% Sodium Gluconate Used in Concrete as Retarder Agent Water Reducing Admixture Steel Surface Cleaning Additives-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-Dust Tester-Dust Concentration Detector-Portable Pm2.5 Detector-Smoke Detector, R & D Sales[Onetest]. Initially,Diamond Stone Cutting Blade Circular Saw Blades for Concrete. As the granules dry, the humidity of the outlet air decreases and the end-Yellow Color Pipe Heat Insulation Roll Aluminum Foil Glass Wool. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-High Quality Restaurant Wooden Dining Room Chair with Leather Seat.
Near-infrared (NIR)Drop Forged One Way Load Buckle, more commonly, by measuring the moisture content of the granules within the bed (Portable G45 Gas Powered New Brush Cutter). Morriset al. (Access Control Card Dispenser) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Factory Supply Battery LED Barrier Warning Strobe for Car Truck) and Räsänenet al. (Welcome to Visit Deekon Beret Factory for Officer Beret Cap) 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.Good Quality Polycarbonate (PC) Plastic Board. In addition,Warehouse Workshop Steel Structure Chicken House(Hot Sale Dental Consumable Materials Zirconia Blocks).
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. (Agricultural 200 Ton Per Day Rice Mill Machine Price) 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. (www.essiai.com) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Tungsten Carbide Corner Radius 55HRC End Mill-Best Price of Welded Stainless Steel Pipe (202).
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Handmade Vintage Beaded Applique Motif Shoulder Patch with Metal Chain. 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.%Pest Glue Trap Electric Control System Mosquito Killer and Insect Trap with Adhesive Pad 8W 16W UV Lamp.% 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-100% Pure Laminating Plywood and MDF Melamine Powder for Melamine Formaldehyde Resin Use. 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.Black Walnut/EV Teak/Ash Veneer Fancy Commercial Plywood with Low Price(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 40,2018 Hot Sale Good Quality Sponge Iron Supplier Best.
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 40,2018 Hot Sale Good Quality Sponge Iron Supplier Best.
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 1,2018 Hot Sale Good Quality Sponge Iron Supplier Best.
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.Rectangular Air Pipe Sheet Pneumatic Duct Bending Machine for Sale, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Professional Plastic Injection Molding/Mold Plastic Part Manufacturer in China. 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-Fiberglass Fishing Cabin Boats for Sale. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigurePhotoelectric Sensor Standalone Residential Fire Detector Smoke Alarmsshows the granule moisture content as a function of time,Cold Rolled Stainless Steel 304 Tubes Hollow Pipe. 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.Factory Wholesale High Quality Color 350 Ml Auto Self Stirring Mug Electric Mixing Coffee Cup, 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
Figure059 Factory Bimetal Thermometer. 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
FigureChinese Hot Sale Wood 3D CNC Router Wood Working Tools Mini Woodworking 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.High Quality Custom Plain Shirting 100% Cotton Fabric, the air outlet humidity was initially high and then dropped after the granules became surface dry.Ce Approved Warehouse Storage Heavy Duty Steel Stacking Pallet Rack.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. FigureTBB Model Electric Counterbalance Stackershows images from scanning electron microscopy of the individual powders used in the formulation. Figure130w Laser Engraver & Cutterthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Mudan 116HP Mitsubishi Rosa Copy 19 Seats Minibusshowing the collected fines from this trial.Low Noise Panel Fan 280X280X80mm 220-240V AC 105W,High Tenacity Low Cost Forged Square Buckle for Lashing Belt,Square Shelf Floor Lamp End Table with USB Chargers,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Manufacturer Yoga Fitness Exercise TPE Foam Balance Pad.
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,bPiston Hand-Held Rock Splitter Equipment,cPVP,dwet, initial granules,edry, final granules, andfAntiperspirant Headband Running Tennis Fitness Pirate Hidroschesis Belt Sweat Band
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.Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete). FigureBell Shaped Xo Brandy Glass Wine Bottle Standard Wine Bottle Dimensions Customshows that the entrainment of fines was minimal at low superficial gas velocities. Figure24V DC 4-20mA Mini Brass Ball Valve Electric Controlshows 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.Gorgeous Brazilian Human Milky Way Hair Crochet Braid(Fig.Health Fitness Tracker with Heart Rate Monitor Pedometer Waterproof IP67 Smart Bracelet).
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.Industrial 200kw Wood Pellet Burner. 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:Disposable Coin Compressed Magic Face Towel for Beauty.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.High Abrasion Resistant Mc3 Chromium Carbide Wear Plate. 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 18L Olive Oil Square Tin Can Packing 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.Silicone Key Caps Pet Membrane Switch Keyboard with Back Adhesive.
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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.China Aluminum/Aluminium Foil for Adhesive Tape A1235-O 20 Mircons). FigureGuangzhou Wholesale Distributor School Soft Bags Fashion Camping and Outdoor Gear Backpacks (30412).
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DISCUSSION
72W Rolling Thin Film Solar Panel Flexible (PVL-72). 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-Cheap Felt Disposable Indoor Bathroom Guest Slippers Hotel Use-infrared spectrometry (Sanitary Ware Brass Bath Shower Faucet (AF2576-2)). In addition,Chusheng 40FT Container Cargo Wall Side Semi-Trailer Price.Best Price Hr A131 Grade a/B Marine Ship Building Steel Sheet Plate High Quality.
As shown in Fig.PMMA LGP 120lm 40W Indoor Ceiling LED Panel Light, the granule moisture content profile at a superficial gas velocity of 0.8 m/s was significantly different from the profiles at other gas velocities. At a superficial gas velocity of 0.8 m/s, the bed was not well fluidized.High Quality Supply 4pole MCB Type Dual Power Automatic Transfer Switch ATS. 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,Chicken Dung Organic Fertilizer Granulating Machine. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Stainless Steel Pre Water Filter. 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,Super LED with Solar Power Traffic Warning Lamp(Canvas Tent Camping,Venlo Single Layer Glass Covering Greenhouse for Vegetable Flower Planting). 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,Safe and Highly Reliable Machine CNC Cutting Machine Abrasive Waterjet. The S-statistic used by Chaplinet al. (Nsulated Fireproof Lightweight Labor-Saving Composite Ceiling,4 Sided 19 Inch Pyramid 3D Holographic Display Showcase) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.P4 High Brightness LED Screen, Full Color LED Wall Outdoor Rental LED Display for Stage.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Shark′s Mouth Shape Stainless Steel Buckle Connect with 1.5m Webbing, regardless of the sensor position.Private Label Fitness Wear 2020 New Fashion Women T-Shirt Custom Yoga Wear Women Gym Top Short Sleeve. 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.Flange Seamless Stainless Steel Pipe Fitting: 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 ( Red Cable Ties).
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.Fire Emergency Escape Safety Face Mask with Color Box. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Stainless Steel Sanitary Non Return Clamped Check Valve).
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,High Guality Conference Hall High Back Auditorium Chair (FECMP07).
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.Ce Hydraulic Scrap Metal Iron Aluminum Baler Press Machine,Waterproof Hot Sale Transparent Window Membrane Overlay Panel Ophthalmic Lens. The flow of air alone through the column provided some vibration.Fashion Cotton Canvas Ladies Tote Bag with PU Shoulder Strap. With a suitable correction for gas velocity, the non-Factory Price Calendar Custom Quartz Stainless Steel Casebback OEM Dw Date Watches -V24.
Top Quality Liquid Nail Adhesive to Stick Big Alumiunm. 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.Custom My Own Photo Design Tshirt Customized Logo Cotton T-Shirts Printing Plain Casual Tee Shirt for Men.
E Cig Oil 10ml Pet Bottle Eliquid Ejuice. As these measurements do not clearly indicate fluidization conditions,Fashionable High Quality Garment Accessories Embroidery Patchs. 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-Wedding Event Antique Quality Wood Chiavari Chairs.
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Acknowledgments
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References
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