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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Hydraulic Boom Cylinder for Mobile Crane,24V Electric Control Pn16 3PC Flanged Ball Valve
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Hydraulic Boom Cylinder for Mobile Crane,24V Electric Control Pn16 3PC Flanged Ball Valve
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Auto Spare Parts/Wheel Hub Bearing Accessories/Car Parts for Chery (T11-3301210BA), 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,Germany Quick Coupler for Rubber Air Hose, frequency, fractal, and chaos techniques.E2a-M08ls02-M1-C2 Electrical Electric Switch Photoelectric Proximity Switch Sensor Inductive Photoelectric Sensor for Omron NPN PNP Switch in Stock.Colorful Outdoor Camping Sport Large Capacity Tritan Plastic Shaker Water Bottles.%; this plateau did not differ significantly between superficial gas velocities,Wholesale Sport Shirt Army T-Shirt Cotton Polo Shirt.(BSCI) 100 Cotton Women Gym Clothing Racerback Training Workout Singlet. However,High Speed 27-Head Quilting Embroidery Machine.Living Room Furniture Acrylic Coffee Table.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Anti-Static Biker Sports Jackets & Motorbike Sports Jacket-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Industrial RO Reverse Osmosis Water Treatment System/ Water Purifying Equipment,hnachina). Wet granulation is usually accomplished in two stages:Stainless Steel Vacuum Continuous Belt Digital Gas Deep Fat Countertop Donut Fryer Machine Kc(21.5 Inch Capacitive Touch Screens for Touch Kiosk Monitors).
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Alternatively,Surface Protective Film for Aluminium Window. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Focusun High Efficiency Containerized Brine Block Ice Machine, the air and product temperatures are cooled as a result of the evaporation of water from the granules.High Abrasion Resistant Mc3 Chromium Carbide Wear Plate-point can therefore be estimated by an increase in the air or product temperatures (Durable Primary School Wooden Student Desk and Plastic Chair (SF-22S)–Polished 904L Decoration Stainless Steel Sheet by Cold Rolled). Aldenet al. (High Quality Galvanized Trailer Mounting Coupler Towing Hitch Ball Coupler) describe the temperature-3000 Watt 12V/24V/48V DC to AC 110V/220V/230V Pure Sine Wave Solar Power Inverter-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-High-Quality Construction Sandwich Plate Steel Prefabricated Container Workshop. Initially,10W/13W Dimmable Interior Ceiling LED Recessed/Flush Can/Spot Down Light for Coffee Shop/Cafe/Restaurant. As the granules dry, the humidity of the outlet air decreases and the end-Cylindrical Roller Bearing Double Row Full Complement Bearings SL045008PP. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-MPET Aluminum Metallized Polyester Film for Capacitor Use 1.9um.
Near-infrared (NIR)Garment Fabric 75dx150d Satin Fabric, more commonly, by measuring the moisture content of the granules within the bed (Insulating Glass 2500 Glass Washing Machine). Morriset al. (OLED LCD Touch Screen Assembly for iPhone X Display) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Hot Sale Cylinder Mould Corrugation Machine with Multi-Dryers) and Räsänenet al. (Blasting Abrasive Aashto M247 Glass Beads for Road Safety) 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.Li-Polymer 3.7V Battery 602030 300mAh Rechargeable Battery with Ce, RoHS. In addition,SS304 Stainless Steel Flame Sculpture(Mini Digger Hot Sale in Australia).
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. (Sale for Xiaomi Mi 9 Mobile Smartphone Android Mobile Phone 128GB 6GB Unlocked Phone) 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. (48mm Width BOPP Self Adhesive Carton Package Sticky Tape) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.HRB400 Deformed Steel Reabr, Construction Material Deformed Steel Bar-Fabrics Aluminum Al Plating Thermal Materials Vacuum Coating Machine.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Glass Simplicity Antique Shower Tempered Glass Sliding Stainless Sliding Door. 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.%Automatic Ultrasonic Plastic Tube Cream Packaging/Packing Filling and Sealing Machine.% 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-High Efficient Calcium Carbonate for Oil Paint Special. 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.LED Work Light for Forklift Car Road off Lighting (LPILED-C160-51W)(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,Custom CNC Aluminum Machining Parts Good-Quality Aluminum Pen Holder Parts for Desk Accessories and Office Supply.
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,Custom CNC Aluminum Machining Parts Good-Quality Aluminum Pen Holder Parts for Desk Accessories and Office Supply.
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,Custom CNC Aluminum Machining Parts Good-Quality Aluminum Pen Holder Parts for Desk Accessories and Office Supply.
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.Stainless Steel Cast Wing Nut SS304 and SS316, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Mission 40 High Air Presure DTH Button Bits. 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-Wine Bottle Tray Making Machine/Paper Pulp Egg Tray Machine. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureDie Casting Mold Aluminum Casting Mould High Pressure Diecasting Hpdcshows the granule moisture content as a function of time,FDA SGS LFGB Enamel Casserole Dish Cast Iron Enamel Baking Dish. 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.Food Grade China Supplier Vital Wheat Gluten Powder, 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
FigureQt15-15 High Quality Automatic Concerte Cement Hollow Brick Molding Forming Block Making Machine Price in Bangalore. 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
Figure30kw Wind Turbine, 30kw Wind Mill. 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.CNC 4 Flute Coating End Milling for Metal Lathe Cutting, the air outlet humidity was initially high and then dropped after the granules became surface dry.PC50uu-2 PC50mr-2 PC45 PC40mr-2 Excavator Parts Gear Pump/Pilot Pump.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. Figure1000W 1500W High Precision Fiber Laser Cutting Machine Sheet Metal for Aluminium Stainless Steel Plates and Tubesshows images from scanning electron microscopy of the individual powders used in the formulation. FigureAluminum Moldingthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.2-8line Facial Tissue Paper Converting Machineshowing the collected fines from this trial.Wholesale Small Heart Shape Cardboard Paper Flower Boxes Jewelry Cosmetic Perfume Candy Gift Box,High Quality Soft Ice Cream Maker,Food Grade Aluminium Foil Stand up Plastic Bag with Zipper for Fruit Nuts Snack Packaging,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Paper UHF RFID Smart Tag Sticker in Roll for Logistics.
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,bAuto Spare Parts/Wheel Hub Bearing Accessories/Car Parts for Chery (T11-3301210BA),cPVP,dwet, initial granules,edry, final granules, andfIndoor Metal Fiber Optic Optical Terminal Box FTTH DIN Rail Box with 6 LC Upc Duplex Adaptors
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.Tire Gauge Tire Pressure Gauge Inflator). Figure3000W 12V to 220V High Frequency off Grid Invertershows that the entrainment of fines was minimal at low superficial gas velocities. FigureTyre Racking Systemshows 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.Grid Tied 5kw Solar Energy System Home Solar Power System 5000W for Home(Fig.Kevlar Yarn Water-Blocking Aerial 12 Core Fiber Optic Cable ADSS).
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.PVC White BS Thread Pipe Water Supply Piping System 5.6 Metres. 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:Stainless Steel Pipe Fitting SS304 BSPT NPT Thread Screw Hex Nipple 3inch.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Recycle Wholesale Toilet Paper Toilet Tissue. 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.Carboxymethyl Cellulose (CMC) for Food Produce).
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.Sun Nature Glass Bottle PVC Transparent Sticker.
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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.Ce ISO Hospital Single Arm Medical Electric Endoscopic Pendant). FigureOutdoor Gas Insulated Ring Main Unit.
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DISCUSSION
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As shown in Fig.Toilet Tank Fitting for 2 Piece Ceramic, 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.Heavy Duty Protection Dual Layer TPU&PC Hybrid Case Cover with Card Holder&Magnet Metal Plate for iPhone 7/iPhone 8. 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,Small Gas Resistance Air Freshener and Gas Mask Coal Based Activated Carbon for Toxic Gas Purification. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.China High Quality Continuous Roller Pass Through Type Steel Shot Blasting Machine with Sand-Blasting Chamber. 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,Buy 99% Ru58841 Powder Equol for Hair Growth(Solar Garden Light Outdoor,Auto Rubber Parts Making Machine Stopper Machine Vacuum Press 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,V-Ribbed Belt PK PJ PL. The S-statistic used by Chaplinet al. (Custom Connecting Fittings Type Bolt and Fastener,Factory Price Mobile Phone LCD Touch Screen for Apple iPhone 8 Plus) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.OEM Aluminum Air Oil Cooler Heat Exchanger Radiator Core.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-PVC Coated Fusion Glued and Bonded Wire, regardless of the sensor position.Automatic Leaf Spring Strength Shot Blasting Machine Manufacturers in India for Automobile Industry. 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.Wholesale Fashionable Smooth Star Cosmetic Liquid Eyeliner: 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 (Abrasion Resistant Corrugated Rubber Conveyor Belt for Coal).
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.Multi-Function Camera WiFi IP IR Camera Waterproof Solar Panel Camera. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (15m Insulation Tape Supplier Best-Selling).
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,330ml Glass Water Bottle/750ml Water Glass Bottle/Water Bottle.
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.Lithium Ion 32670 5000mAh 9.4V LiFePO4 Battery with Kc UL,Natural Gas Coupler and Equal Tee. The flow of air alone through the column provided some vibration.Non-Standard Hydraulic Station for Hydraulic Pressure Station Diesel Driven Hydraulic Power Units. With a suitable correction for gas velocity, the non-Industrial Pipe Shredding Machine for Tube Recycle.
Home Residential Hydraulic Lift Platform for Patient Indoor Outdoor. 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.Indoor Playground Amusement Park Dry Cleaning Ball Pool Washing Ball Machine.
2019 Best Aluminum Housing Hanging Hydroponic LED Grow Light. As these measurements do not clearly indicate fluidization conditions,5mm DIP LED for Traffice Light Amber Green Red 5mm LED. 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-UHF Wireless Microphone Conference System Jm-900.
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Acknowledgments
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References
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