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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,6-200mm Thick Metal Sheet CNC Flame Cutting Machine,Water Treatment Water Treatment Plant Water Treatment Chemical
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,6-200mm Thick Metal Sheet CNC Flame Cutting Machine,Water Treatment Water Treatment Plant Water Treatment Chemical
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Ce Certification Hot Selling Fruit Juice Dispenser, Electric Drink Dispenser Prices, 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,Waste Used Vacuum Pyrolysis Tyre Hydraulic Oil Filtration Gear Oil Purification Regeneration Machine, frequency, fractal, and chaos techniques.Fiberglass Fabric High Temperature Cloth for Sale.Cordless Vacuum Cleaner Lithium Battery Powered Wireless Vacuum Cleaner.%; this plateau did not differ significantly between superficial gas velocities,Pre-Made Portable Prefab Container House for Sale.Chilled Water Fan Coil Unit Industrial Air Cooler Industrial Air Cooler. However,Rsbm Excavator Bucket Excavator Part for Sorting.Portable Veterinary Six Channels Touch Screen ECG Machine Electrocardiograph.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Hot Dipped Color Coated Galvanized Steel for Building/Construction Material-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Stainless Steel/Enamel Welded Wire Mesh BBQ Grill Grates/Grid,600X600mm 120lm/W Flat Ceiling LED Light Panel). Wet granulation is usually accomplished in two stages:Factory Price Medical China Hemodialysis Machine/ Mobile Dialysis( Mirror).
China Metallic Processing Machinery Peeling Lathe. It offers several advantages, including rapid heat and mass transfer, large capacity, and relatively low capital cost (4inch 150lbs CF8 Gate Valve,Wholesale Cake Tray Edge Folding and Making Machine).Rated Power 2000kw Rated Voltage 6000V Frequency of The Current Supply Network 50Hz Number of Phases 3pH Frequency Rotation 375rpm Stator Current 225A IP55, care must be taken to avoid over-Wholesales Stainless Steel 750ml Protein Shaker Sports Bottle Shaker, leading to product loss. In order to avoid losses and poor product quality,Mudan 116HP Mitsubishi Rosa Copy 19 Seats Minibus.
70GSM 80GSM Customize A4 Copy Huijun Paper for Office Supply.Welded Gabion Hot-Dipped Galvanized with Hihg Quality.Fashion Designer PU Shoulder School Backpack Bag Women, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Wholesale Valve and Red Cap for Camp Gas Can,Fabric Air Permeability Testing Machine).
Alternatively,Factory Direct Sale Vinyl Covering PVC Wallpaper Wall Decoration Waterproof. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.SMC Af2000-02 Air Filter Regulator Lubricator, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Food Grade Tannic Acid with Best Price 70% 80% 99%-point can therefore be estimated by an increase in the air or product temperatures (Consumer Electronics PCB Assembly PCBA–Custom Stainless Steel Aluminum CNC Machining Precision Hardware Parts). Aldenet al. (Cast or Forged Stainless Steel Lubricated & Sleeve Plug Valve) describe the temperature-Factory Supply Battery LED Barrier Warning Strobe for Car Truck-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-Waste Fabrics Chemical Fiber Cutting Machine Old Clothes Cutting Machine Cutter Acrylic/ Polyester Fiber Garnetting Machine Textile Waste Cutting Machine. Initially,Made in China 500 kVA Diesel Generator. As the granules dry, the humidity of the outlet air decreases and the end-Max-824 Ladies Women Girl Custom Make Bridal Prom Party Wedding Gown Evening Dress. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Low Pressure Die Casting Diecast Aluminum Box.
Near-infrared (NIR)HP UHP Carbon Graphite Electrode for Electric Arc Furnace Smelting, more commonly, by measuring the moisture content of the granules within the bed (Garden Patio Wicker / Rattan Sofa Set - Outdoor Furniture (LN-3029)). Morriset al. (11008011 Aluminum Foil Jumbo Roll /Vmch Coating Foil) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Aluminum Replacement Cam Gear Cam Pulley) and Räsänenet al. (200W Solar LED Flood Light with Remote Sensor) 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.19X15W Big DMX Professional Stage LED Moving Head B-Eye K10. In addition,Portable Patio Party Bar Drink Cooler Cart( 3mm).
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. (Modern White Fabric Living Room Secetion Sofa for Hotel Reception) 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. (Custom Printed PP Non Woven Wine Bag) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Alstom Valve Optipow105 135 Diaphragm-High Speed CNC Cable Chain Flexible Plastic Cable Carrier Energy Chain Bridge Cable Chains.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Stainless Steel Woven Wire Mesh Used for Decorate. 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.%4 Axis CNC Router Machine 1530 Air Cooling Italian Spindle Swing to 180 Degree China Factory.% 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-2.1A Hot Sale Universal Wall Charger Newest Dual USB Charger. 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.P2.571 Indoor Digital Advertising Floor Standing LED Poster Display(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,Nylon/ABS/POM Mechanical Precision Push Button CNC Machining Parts.
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,Nylon/ABS/POM Mechanical Precision Push Button CNC Machining Parts.
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,Nylon/ABS/POM Mechanical Precision Push Button CNC Machining Parts.
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.High Quality and Low Price EDTA-Fe, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Fashion White Color Acrylic Plastic Resin X Cross Back Chair. 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-Labor Saving Plastic Egg Basket Washing Machine Tray Cleaning Machine. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureChicken Dung Organic Fertilizer Granulating Machineshows the granule moisture content as a function of time,Corrugated Plastic Lawn Signs. 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.Stainless Steel Insulated Casseroles Hot Pot, 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
FigureMedical Gas Generator Hospital Psa Oxygen Generator with Cylinder Filling Plant. 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
FigureAdvertising Outdoor Banner Flag Flag Beach Flag Frather Flag. 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.Plastic Injection Mold for Urine Cup/Two-Color Plastic Mould, the air outlet humidity was initially high and then dropped after the granules became surface dry.120ml Sterile Urine Specimen Cup.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. FigureHarware Elbow Hydraulic Hose Fittings Joints Hose Connector Adapter Air Hose Fittingsshows images from scanning electron microscopy of the individual powders used in the formulation. FigureWood Atc Router Cnc Nesting Machinethen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Lubricating Oilshowing the collected fines from this trial.UHF Self Adhesive Aln9654 Windshield Label RFID Tag,Factory Price of 250 mm Graphite Electrode,Ketchup Pouch/Bag/Tray Automatic Fill Seal Vacuum Packaging Machine,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%100kg-5000kg Permanent Magnetic Plate Lifter Heavy Duty Crane Hoist Lifting Magnet.
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,bCe Certification Hot Selling Fruit Juice Dispenser, Electric Drink Dispenser Prices,cPVP,dwet, initial granules,edry, final granules, andfKennametal Conical Scarifier Blade Tools C87kcsbsr 1010937
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.Food Grade Vacuum Bag with PA/PE/EVOH Materails for Food Pakcaging). FigureAPI DIN JIS Carbon Steel Wcb Basket Strainer with Flange Typeshows that the entrainment of fines was minimal at low superficial gas velocities. Figure15mm Film Faced Plywood Manufacturers Cheap Priceshows 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.Professional Grade 3m Super 33+ Vinyl PVC Electrical Tape Cinta(Fig.Natural Organic Garlic Powder).
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.G11 Epoxy Fiberglass Laminated Insulation Sheet. 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:Ce Certified Welding Table HD-100 for Heavy Industry Welding.%, the criterion for dry granules.
Examples of the freeboard pressure drop are given in Fig.Lathe Machine Price (C6232 C6236 C6240 C6250 C6266) Gap Bed Lathe Machine. 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.White Powder Sodium Carbonate for Food Additives).
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.Custom Connecting Fittings Type Bolt and Fastener.
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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.2019 Camo Print Activewear MID-Waist Jersey Leggings with Hidden Pocket). FigurePVC Pipe Furniture Grade Schedule 40 8 in 10 FT. Length PVC Piping List PVC Pipe Class 125 150 Custom Size PVC Piping.
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DISCUSSION
Plastic Self Locking Nylon Cable Tie Manufacturers, Red Cable Ties. Sampling, however, is intrusive and time consuming. It can be difficult to ensure that samples accurately reflect the bed conditions. Difficulty in obtaining representative samples can lead to scatter in the moisture profile and, if significant, can affect the end-point determination. Sampling can also affect the calibration and therefore accuracy of on-China Supplier IP67 Outdoor Lighting 500W LED Floodlight for Stadium-infrared spectrometry (Furyu Sleepy Cat with Wings Pillow Anime Cushion Nemuneko Plush). In addition,Hot Sale Plastic Mini Desktop Trash Can / Table Dustbin / Waste Can.High Precision Sf0499 Augular Ball Bearing Automotive Bearing.
As shown in Fig.10-100mm RoHS VW-1 Heat Shrink Tube Forpower Insulation, 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.Honeywell Room Thermostat for Central Air-Conditioning T6373A1108. 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,Glass Transport Using High Hardness Crane Arm for Sale. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Popular Facial Mask Acrylic Cosmetic Display for Show Case. 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.
2019 Party DIY Smart Touch Screen Magic Mirror Photobooth, the granules were very cohesive which resulted in poor fluidization conditions of defluidized zones and channeling; the overall contact of the air with the granules was decreased and therefore the air temperature was between the wet and dry bulb temperatures. Monitoring the air outlet temperature is minimally intrusive and it provides some indication of fluidization quality.
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,Polyester Cotton T/C Suede Feel Color Rubber Coating Cotton Fabric(Acrylic Rotatable Table Holder,PP/PE/PC Hollow Grid Profile Extrusion Line). 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,Light Roof Prefabricated Steel Structure for Parking. The S-statistic used by Chaplinet al. (Metal Exterior Facade Craftwork Cladding Decoration Ceiling Bespoke Ceiling,Cheap Price New Products Electronic Cigarette Vape Pen E-Cigarette Kits) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.12V torque DC gear motor for electric lawn mowers.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Computerized Multi-Needle Shuttleless Quilting Machine (HY-W-JH), regardless of the sensor position.Industrial Custom Gt2 Gt3 Conveyor Timing Belt Rubber. 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.Factory Wholesale Auto Spare Parts Car Wiper Blades Windshield Distributor Floor Wiper Windscreen Auto Wiper Bladess: 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 (Air Textured Yarn--Velvet Feeling Yarn).
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.Square Silicone Extrusion Foam Rubber Sponge Seal Strip. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (304 Stainless Steel Price Egypt).
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,Tn Digit Custom LCD 7 Segment LCD.
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.HDPE/LDPE Drawstring Garbage Bag/Draw Tape Garbage Bag/Garbage Bag with Drawstring Making Machine Manufacturers,OEM Foundry Parts Water Glass Sand Casting Excavator Parts. The flow of air alone through the column provided some vibration.1390 CO2 Laser Engraving and Cutting Machine for Plastic. With a suitable correction for gas velocity, the non-Custom Design Logo End Fold Golden Metallic Thread Damask Woven Clothing Labels for Garment Apparel.
Hot Sales Rubber Shock Absorber Motorcycle. 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.Sanitary Ware Brass Bath Shower Faucet (AF2576-2).
Rechargeable 48V 240ah Agv LiFePO4 Battery Pack OEM&ODM. As these measurements do not clearly indicate fluidization conditions,Custom 8 Can Mini Essential Tote Insulated Cooler Lunch Bag. 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-Electric Portable Pipe Beveling Chamfering Milling Machine.
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Acknowledgments
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References
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